JP2018162964A - Heat exchanger unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger unit which enables improvement of heat exchange performance in an air conditioner.SOLUTION: A heat exchanger unit 42 includes a first heat exchanger 52 and a second heat exchanger 62. The first heat exchanger 52 has: a first header 523 and a second header 524; and a first flat tube group 500 comprising multiple flat multi-hole tubes individually connected to the first header 523 and the second header 524. Further, the second heat exchanger 62 is arranged parallel to the first heat exchanger 52 and is disposed at a leeward side of airflow generated by an indoor fan 41 relative to the first heat exchanger 52. The second heat exchanger 62 has a third head 623, a fourth header 624, a second flat tube group 600 comprising multiple flat multi-hole tubes individually connected to the third header 623, and the fourth header 624. The fourth header 624 has a connection pipe 625 (return part) which returns a refrigerant flowing from a third header 623 side to the third header 623 side.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a heat exchanger unit.

  In recent years, a heat exchanger having a two-row configuration using a flat multi-hole tube is mounted on an air conditioner. For example, Patent Document 1 (Japanese Patent Laid-Open No. 2006-38192) discloses a first parallel flow heat exchanger disposed on the windward side of the air flow and a second parallel flow heat disposed on the leeward side. A heat exchanger unit is disclosed which is formed so that the flow direction of the refrigerant is opposite to that of the exchanger.

  However, when the heat exchanger unit having the above-described configuration is used as a condenser, the air that has been warmed through the overheat region of the windward heat exchanger flows into the leeward heat exchanger. Therefore, in the leeward heat exchanger, it is difficult to ensure a temperature difference between the air and the refrigerant, and the amount of refrigerant cooled in the supercooling region is suppressed. In particular, when the refrigerant flow is opposed between the leeward heat exchanger and the leeward heat exchanger, it is difficult to ensure a temperature difference between the air and the refrigerant in the supercooling region of the leeward heat exchanger. Become. As a result, the heat exchange performance in the air conditioner is suppressed.

  The subject of this invention is providing the heat exchanger unit which can improve the heat exchange performance in an air conditioning apparatus.

  The heat exchanger unit according to the first aspect of the present invention includes a first heat exchanger and a second heat exchanger. The first heat exchanger includes a first header and a second header, and a first flat tube group including a plurality of flat multi-hole tubes connected to the first header and the second header. The second heat exchanger is arranged in parallel with the first heat exchanger, and is arranged on the leeward side of the air flow by the fan than the first heat exchanger. The second heat exchanger includes a third header and a fourth header, and a second flat tube group including a plurality of flat multi-hole tubes connected to the third header and the fourth header, respectively. Here, the fourth header has a folded portion that folds the refrigerant flowing in from the third header side to the third header side.

  In the heat exchanger unit according to the first aspect, the first heat exchanger is provided on the windward side, the second heat exchanger is provided on the leeward side, and the fourth header of the second heat exchanger on the leeward side is the refrigerant. When the heat exchanger unit is used as a condenser, at least part of the supercooling region of the second heat exchanger is removed from the space behind the superheated region of the first heat exchanger when the heat exchanger unit is used as a condenser. It can arrange so that it may not overlap. Thereby, when the heat exchanger unit is used as a condenser, the amount of refrigerant cooled in the supercooling region can be increased in the leeward heat exchanger. As a result, the heat exchange performance in the air conditioner can be improved.

  A heat exchanger unit according to a second aspect of the present invention is the heat exchanger unit according to the first aspect, wherein a plurality of flat multi-hole tubes are arranged vertically in the second flat tube group, and one or more flat tubes on the upper side. The multi-hole tube forms the upper second heat exchange region, and the lower one or more flat multi-hole tubes form the lower second heat exchange region. The fourth header includes an upper fourth header and a lower fourth header that are connected to the upper second heat exchange region and the lower second heat exchange region, respectively. And a folding | returning part connects an upper 4th header and a lower 4th header, and folds the refrigerant | coolant which flows in from the 3rd header side to the 3rd header side.

  In the heat exchanger unit according to the second aspect, the fourth header of the second leeward heat exchanger connects the upper second heat exchange region and the lower second heat exchange region and turns back the refrigerant flow. When the heat exchanger unit is used as a condenser, at least a part of the supercooling region of the second heat exchanger does not overlap with the space behind the superheated region of the first heat exchanger. Can be arranged.

  The heat exchanger unit according to a third aspect of the present invention is the heat exchanger unit according to the second aspect, wherein the folded portion has a connecting pipe that connects the upper fourth header and the lower fourth header.

  In the heat exchanger unit according to the third aspect, since the fourth header has a connecting pipe that connects the upper fourth header and the lower fourth header, the connection port of the connecting pipe is adjusted (for example, the upper fourth header By connecting the connecting pipe downward), when used as an evaporator, the refrigerant can be flown so as to blow up from the bottom to the top, and the drift can be improved. In addition, the state of the refrigerant | coolant which flows through the 2nd heat exchanger can be grasped | ascertained by attaching various measuring devices to this connection pipe. And the heat exchange performance of an air conditioning apparatus can further be improved by performing various adjustments based on this measured value.

  In the heat exchanger unit according to the fourth aspect of the present invention, in the heat exchanger unit according to any one of the first aspect to the third aspect, a temperature measuring device for measuring the temperature of the refrigerant is attached to the folded portion.

  In the heat exchanger unit according to the fourth aspect, since the temperature measuring device is attached to the connecting pipe that connects the upper fourth header and the lower fourth header, the temperature of the refrigerant flowing inside the second heat exchanger can be grasped. . The heat exchange performance of the air conditioner can be further improved by optimizing the state of the refrigerant based on the measured value.

  A heat exchanger unit according to a fifth aspect of the present invention is the heat exchanger unit according to any one of the second aspect to the fourth aspect, wherein the first direction of the refrigerant flow from the first header to the second header, The second direction of the refrigerant flow from the header toward the fourth header is opposed. The third header has an upper third header and a lower third header that are connected to the upper second heat exchange region and the lower second heat exchange region, respectively. Further, the area of the upper second heat exchange region is larger than the area of the lower second heat exchange region. A gas refrigerant pipe through which a gaseous refrigerant flows is connected to the first header and the upper third header. A liquid refrigerant pipe through which the liquid refrigerant flows is connected to the second header and the lower third header.

  In the heat exchanger unit according to the fifth aspect, the flow of the gaseous refrigerant flowing into the first heat exchanger on the leeward side and the gaseous refrigerant flowing into the second heat exchanger on the leeward side face each other. Here, since the flow directions of the refrigerant flowing through the first heat exchanger and the second heat exchanger are opposed to each other, it is possible to reduce the temperature unevenness of the air that has passed through the entire heat exchanger unit.

  On the other hand, when the flow directions of the refrigerant flowing through the first heat exchanger and the second heat exchanger face each other, it is difficult to ensure a temperature difference between the air and the refrigerant in the supercooling region of the second heat exchanger. Become. On the other hand, in the heat exchanger unit configured as described above, since the second heat exchanger has the folded portion, when the heat exchanger unit is used as a condenser, the space behind the overheat region of the first heat exchanger The supercooling region of the second heat exchanger can be arranged so as not to overlap. Further, the supercooling region of the second heat exchanger is disposed in the space behind the supercooling region of the first heat exchanger. Thereby, when a heat exchanger unit is used as a condenser, the amount of refrigerant cooled in the supercooling region can be further increased in the second heat exchanger.

  A heat exchanger unit according to a sixth aspect of the present invention is the heat exchanger unit according to any one of the first to fourth aspects, wherein the second header causes the refrigerant flowing from the first header side to the first header side. It has the 2nd return part to return.

  In the heat exchanger unit according to the sixth aspect, since the second header of the first heat exchanger on the windward side has the second turning portion that turns the refrigerant flow, when the heat exchanger unit is used as a condenser, It can arrange | position so that at least one part of the supercooling area | region of a 2nd heat exchanger may not overlap from the space behind the overheating area | region of a 1st heat exchanger. Thereby, when the heat exchanger unit is used as a condenser, the amount of refrigerant cooled in the supercooling region can be increased in the leeward heat exchanger.

  A heat exchanger unit according to a seventh aspect of the present invention is the heat exchanger unit according to the sixth aspect, wherein a plurality of flat multi-hole tubes are arranged vertically in the first flat tube group, and one or more flat tubes on the upper side. The multi-hole tube forms an upper first heat exchange region, and the lower one or more flat multi-hole tubes form a lower first heat exchange region. Further, the second header has an upper second header and a lower second header connected to the upper first heat exchange region and the lower first heat exchange region, respectively. And a 2nd folding | turning part connects an upper 2nd header and a lower 2nd header, and folds the refrigerant | coolant which flows in from the 1st header side to the 1st header side.

  In the heat exchanger unit according to the seventh aspect, the second header of the first heat exchanger on the windward side connects the upper first heat exchange region and the lower first heat exchange region and turns back the refrigerant flow. Since it has 2 folding | turning parts, when using a heat exchanger unit as a condenser, at least one part of the supercooling area | region of a 2nd heat exchanger does not overlap from the space behind the overheating area | region of a 1st heat exchanger. Can be arranged as follows. Thereby, when a heat exchanger unit is used as a condenser, the amount of refrigerant cooled in the supercooling region can be increased in the second heat exchanger.

  Moreover, at least a part of the supercooling region of the second heat exchanger can be arranged in the space behind the supercooling region of the first heat exchanger. Thereby, the refrigerant | coolant amount cooled in the supercooling area | region of a 2nd heat exchanger can further be increased.

  A heat exchanger unit according to an eighth aspect of the present invention is the heat exchanger unit according to the seventh aspect, wherein the refrigerant flows from the first header to the second header in the first direction and from the third header to the fourth header. The second direction of the refrigerant flow opposes. The first header has an upper first header and a lower first header that are connected to the upper first heat exchange region and the lower first heat exchange region, respectively. The third header has an upper third header and a lower third header that are connected to the upper second heat exchange region and the lower second heat exchange region, respectively. The areas of the upper first heat exchange region and the upper second heat exchange region are larger than the areas of the lower first heat exchange region and the lower second heat exchange region, respectively. A gas refrigerant pipe through which a gaseous refrigerant flows is connected to the upper first header and the upper third header. A liquid refrigerant pipe through which liquid refrigerant flows is connected to the lower first header and the lower third header.

  In the heat exchanger unit according to the eighth aspect, the flows of the gaseous refrigerant flowing into the first heat exchanger on the leeward side and the gaseous refrigerant flowing into the second heat exchanger on the leeward side face each other. Here, since the flow directions of the refrigerant flowing through the first heat exchanger and the second heat exchanger are opposed to each other, it is possible to reduce the temperature unevenness of the air that has passed through the entire heat exchanger unit.

  On the other hand, when the flow directions of the refrigerant flowing through the first heat exchanger and the second heat exchanger face each other, it is difficult to ensure a temperature difference between the air and the refrigerant in the supercooling region of the second heat exchanger. Become. On the other hand, in the heat exchanger unit having the above configuration, the second header of the first heat exchanger has the second folded portion, so that when the heat exchanger unit is used as a condenser, It can arrange | position so that the supercooling area | region of a 2nd heat exchanger may not overlap from the space behind a superheating area | region. Further, the supercooling region of the second heat exchanger is disposed in the space behind the supercooling region of the first heat exchanger. Thereby, when a heat exchanger unit is used as a condenser, the amount of refrigerant cooled in the supercooling region can be further increased in the second heat exchanger.

  A heat exchanger unit according to a ninth aspect of the present invention is the heat exchanger unit according to the seventh aspect or the eighth aspect, wherein the second folded portion connects the upper second header and the lower second header. It has a connecting pipe.

  In the heat exchanger unit according to the ninth aspect, since the second header has the second connecting pipe that connects the upper second header and the lower second header, the connection port of the second connecting pipe is adjusted (for example, the upper side By connecting a connecting pipe below the fourth header), a refrigerant flow that blows up the refrigerant from the bottom to the top when used as an evaporator can be formed, and drift can be improved. In addition, the state of the refrigerant | coolant which flows through the inside of a 1st heat exchanger can be grasped | ascertained by attaching various measuring devices to this 2nd connecting pipe. And the heat exchange performance of an air conditioning apparatus can further be improved by performing various adjustments based on this measured value.

  In the heat exchanger unit according to the tenth aspect of the present invention, in the heat exchanger unit according to the ninth aspect, a temperature measuring device for measuring the temperature of the refrigerant is attached to the second folded portion.

  In the heat exchanger unit according to the tenth aspect, since the temperature measuring device is attached to the second connecting pipe that connects the upper second header and the lower second header, the temperature of the refrigerant flowing inside the first heat exchanger is adjusted. I can grasp. The heat exchange performance of the air conditioner can be further improved by optimizing the state of the refrigerant based on the measured value.

  A heat exchanger unit according to an eleventh aspect of the present invention is the heat exchanger unit according to any one of the first to tenth aspects, wherein the first heat exchanger and the second heat exchanger are bent between the headers. .

  The heat exchanger unit according to the eleventh aspect can be installed at a desired installation place by being bent between the headers.

  A heat exchanger unit according to a twelfth aspect of the present invention is the heat exchanger unit according to the eleventh aspect, wherein the first heat exchanger and the second heat exchanger are bent at at least three positions between the headers, It is a substantially square shape.

  In the heat exchanger unit according to the twelfth aspect, the first heat exchanger and the second heat exchanger are bent at least at three locations and are substantially square in a plan view. An air conditioner that can provide conditioned air radially can be realized.

  The “substantially square shape” referred to here does not mean only a perfect rectangle, but an arbitrary shape formed by a set of two parallel sides. Therefore, the substantially quadrangular shape includes those in which the corners are rounded and those in which the corners are cut.

  A heat exchanger unit according to a thirteenth aspect of the present invention is a heat exchanger unit according to the eleventh aspect or the twelfth aspect, wherein the first heat exchanger and the second heat exchanger surround the fan.

  In the heat exchanger unit according to the thirteenth aspect, since the first heat exchanger and the second heat exchanger surround the fan, an air conditioner that can provide conditioned air radially can be realized.

  The heat exchanger unit according to the first aspect can improve the heat exchange performance in the air conditioner when used as a condenser.

  The heat exchanger unit according to the second aspect can improve the heat exchange performance in the air conditioner when used as a condenser.

  The heat exchanger unit according to the third aspect can improve drift when used as an evaporator.

  In the heat exchanger unit according to the fourth aspect, the heat exchange performance of the air conditioner can be further improved.

  In the heat exchanger unit according to the fifth aspect, temperature unevenness in the passed air can be reduced. Moreover, when this heat exchanger unit is used as a condenser, the amount of refrigerant cooled in the supercooling region can be further increased in the second heat exchanger.

  In the heat exchanger unit according to the sixth aspect, when used as a condenser, the amount of refrigerant cooled in the supercooling region of the second heat exchanger on the leeward side can be increased.

  In the heat exchanger unit according to the seventh aspect, when used as a condenser, the amount of refrigerant cooled in the supercooling region can be increased in the second heat exchanger.

  In the heat exchanger unit according to the eighth aspect, temperature unevenness in the passed air can be reduced.

  In the heat exchanger unit according to the ninth aspect, drift can be improved when used as an evaporator.

  In the heat exchanger unit according to the tenth aspect, the heat exchange performance of the air conditioner can be further improved.

  The heat exchanger unit according to the eleventh aspect can be installed at a desired installation location.

  In the heat exchanger unit according to the twelfth aspect, an air conditioner that can provide conditioned air radially can be realized by installing a fan inside.

  With the heat exchanger unit according to the thirteenth aspect, an air conditioner that can provide conditioned air radially can be realized.

It is a schematic structure figure of air harmony device 1 concerning a 1st embodiment of the present invention. It is an external appearance perspective view of the indoor unit 4 of the ceiling-mounted air conditioner according to the embodiment. It is a schematic sectional drawing of the indoor unit 4 of the ceiling-mounted air conditioning apparatus which concerns on the same embodiment. It is a schematic plan view which shows the state which removed the top plate 33 of the ceiling embedded type indoor unit 4 which concerns on the embodiment. It is a schematic perspective view of the heat exchanger 42a used with the heat exchanger unit 42 which concerns on the embodiment. It is a schematic longitudinal cross-sectional view of the heat exchanger used with the heat exchanger unit 42 which concerns on the embodiment. It is a schematic perspective view which shows the other example of the heat exchanger 42a used with the heat exchanger unit 42 which concerns on the embodiment. It is a schematic diagram which shows the structure of the heat exchanger unit 42 which concerns on the same embodiment. It is a schematic diagram which shows the structure of the 2nd heat exchanger 62 which concerns on the same embodiment. It is a figure for demonstrating an internal state when the heat exchanger unit 42 which concerns on the embodiment is used as a condenser. It is a figure for demonstrating an internal state when the heat exchanger unit 42 which concerns on the embodiment is used as a condenser. It is a schematic diagram which shows the planar shape of the heat exchanger unit 42 which concerns on the embodiment. It is a schematic diagram which shows the structure of the heat exchanger unit 42 which concerns on the modification 1A. It is a schematic diagram which shows the structure of the heat exchanger unit 42 which concerns on the modification 1B. It is a schematic diagram which shows the structure of the heat exchanger unit 42 which concerns on the modification 1C. It is a schematic diagram which shows the structure of the 2nd heat exchanger 62 which concerns on modification 1D. It is a schematic diagram which shows the structure of the 2nd heat exchanger 62 which concerns on modification 1D. It is a schematic diagram for demonstrating the structure of the heat exchanger unit 42S which concerns on 2nd Embodiment of this invention. It is a mimetic diagram showing the composition of the 1st heat exchanger 52S concerning the embodiment. It is a figure for demonstrating an internal state when using the heat exchanger unit 42S which concerns on the same embodiment as a condenser. It is a figure for demonstrating an internal state when using the heat exchanger unit 42S which concerns on the same embodiment as a condenser. It is a mimetic diagram showing the plane shape of heat exchanger unit 42S concerning the embodiment. It is a mimetic diagram showing the composition of heat exchanger unit 42S concerning modification 2A. It is a mimetic diagram showing the composition of heat exchanger unit 42S concerning modification 2B. It is a mimetic diagram showing the composition of heat exchanger unit 42S concerning modification 2C. It is a schematic diagram for demonstrating the structure of the heat exchanger unit 42W which concerns on 3rd Embodiment of this invention. It is a schematic diagram which shows the structure of the 1st heat exchanger 52W which concerns on the same embodiment. It is a mimetic diagram showing the composition of the 2nd heat exchanger 62W concerning the embodiment. It is a figure for demonstrating an internal state when using the heat exchanger unit 42W which concerns on the embodiment as a condenser. It is a figure for demonstrating an internal state when using the heat exchanger unit 42W which concerns on the embodiment as a condenser. It is a schematic diagram which shows the planar shape of the heat exchanger unit 42W which concerns on the same embodiment. It is a schematic diagram which shows the structure of the heat exchanger unit 42W which concerns on modification 3A.

  Hereinafter, an embodiment of an air harmony device concerning the present invention and its modification are described based on a drawing. In addition, the specific structure of the air conditioning apparatus which concerns on this invention is not restricted to the following embodiment and its modification, It can change in the range which does not deviate from the summary of invention.

<First Embodiment>
(1) Outline of Air Conditioner (1-1) Basic Configuration of Air Conditioner FIG. 1 is a schematic configuration diagram of an air conditioner 1 according to the first embodiment of the present invention.

  The air conditioner 1 is a device capable of cooling and heating a room such as a building by performing a vapor compression refrigeration cycle. The air conditioner 1 is mainly configured by connecting an outdoor unit 2 and an indoor unit 4. Here, the outdoor unit 2 and the indoor unit 4 are connected via a liquid refrigerant communication tube 5 and a gas refrigerant communication tube 6. In the air conditioner 1, various operations are controlled by the control unit 8 including the indoor control unit 8 a and the outdoor control unit 8. The control unit 8 controls various devices and valves based on detection signals from various sensors.

(1-2) Basic Operation of Air Conditioner Next, the basic operation of the air conditioner 1 will be described. The air conditioner 1 can perform a cooling operation and a heating operation as basic operations. In addition, the air conditioning apparatus 1 can perform a defrosting operation, an oil return operation, and the like. These operations are controlled by the control unit 8.

(1-2-1) Cooling Operation In the cooling operation, the four-way switching valve 22 becomes the refrigerant circuit 10 shown by the solid line in FIG. In the refrigerant circuit 10, the low-pressure gas refrigerant is compressed by the compressor 21 to become a high-pressure gas refrigerant. The high-pressure gas refrigerant is sent to the outdoor heat exchanger 23 through the four-way switching valve 22. The high-pressure gas refrigerant sent to the outdoor heat exchanger is condensed by exchanging heat with outdoor air in the outdoor heat exchanger 23. As a result, the high-pressure gas refrigerant becomes a high-pressure liquid refrigerant. The high-pressure liquid refrigerant is decompressed by the expansion valve 24 and becomes a low-pressure gas-liquid two-phase refrigerant. The low-pressure gas-liquid two-phase refrigerant is sent to the indoor heat exchanger 42 through the liquid refrigerant communication pipe 5 and the liquid side connection pipe 5a. The refrigerant evaporates by exchanging heat with the air blown from the indoor fan 41 in the indoor heat exchanger 42. Thereby, the refrigerant sent to the indoor heat exchanger 42 becomes a low-pressure gas refrigerant. The low-pressure gas refrigerant is sent again to the compressor 21 through the gas side connection pipe 6 a, the gas refrigerant communication pipe 6, and the four-way switching valve 22.

(1-2-2) Heating Operation In the heating operation, the four-way switching valve 22 becomes the refrigerant circuit 10 indicated by the broken line in FIG. In the refrigerant circuit 10, the low-pressure gas refrigerant is compressed by the compressor 21 to become a high-pressure gas refrigerant. The high-pressure gas refrigerant is sent to the indoor heat exchanger 42 through the four-way switching valve 22, the gas refrigerant communication pipe 6, and the gas side connection pipe 6a. The high-pressure gas refrigerant sent to the indoor heat exchanger 42 is condensed by exchanging heat with the air blown out from the indoor fan 41. As a result, the high-pressure gas refrigerant becomes a high-pressure liquid refrigerant. The high-pressure liquid refrigerant is sent to the expansion valve 24 through the liquid side connection pipe 5 a and the liquid refrigerant communication pipe 5. The high-pressure liquid refrigerant is decompressed by the expansion valve 24 and becomes a low-pressure gas-liquid two-phase refrigerant. The low-pressure gas-liquid two-phase refrigerant is sent to the outdoor heat exchanger 23. The refrigerant evaporates by exchanging heat with outdoor air in the outdoor heat exchanger 23. Thereby, the refrigerant sent to the outdoor heat exchanger 23 becomes a low-pressure gas refrigerant. The low-pressure gas refrigerant is sent again to the compressor 21 through the four-way switching valve 22.

(2) Configuration of Indoor Unit In addition to the basic configuration described above, the indoor unit has the following configuration in the air conditioning apparatus according to the present embodiment.

  In the present embodiment, the term “indoor” is used to distinguish from other rooms, and is used to include not only the indoor space partitioned by the wall surface, but also the space behind the indoor ceiling, for example. .

(2-1) Basic Configuration of Indoor Unit The indoor unit 4 is installed indoors and constitutes a part of the refrigerant circuit 10. The indoor unit 4 mainly includes an indoor fan 41, an indoor heat exchanger 42, and an indoor control unit 8a.

  The indoor fan 41 sucks indoor air into the indoor unit 4. Thereby, in the indoor heat exchanger 42, heat can be exchanged between the indoor air and the refrigerant. Moreover, the indoor fan 41 supplies the indoor air heat-exchanged with the indoor heat exchanger 42 into the room as supply air. As the indoor fan 41, a centrifugal fan, a multiblade fan, or the like is used. The indoor fan 41 is driven by an indoor fan motor capable of controlling the rotation speed.

  The indoor heat exchanger 42 functions as a refrigerant “evaporator” during cooling operation, and cools indoor air. The indoor heat exchanger 42 functions as a refrigerant “condenser” (heat radiator) during heating operation, and heats indoor air. The indoor heat exchanger 42 is connected to the liquid refrigerant communication tube 5 and the gas refrigerant communication tube 6. Further details of the indoor heat exchanger 42 will be described later.

  The indoor control unit 8 a controls the operation of each unit constituting the indoor unit 4. Specifically, the indoor control unit 8 a includes a microcomputer, a memory, and the like, and controls the operation of the indoor unit 4 based on detection values and the like of various sensors provided in the indoor unit 4. The indoor control unit 8a communicates a control signal with a remote controller (not shown) for individually operating the indoor unit 4, and a control signal with the outdoor control unit 8b via a transmission line. To communicate.

  In addition, the indoor unit 4 is provided with various sensors. Thereby, the temperature of the refrigerant in the indoor heat exchanger 42, the temperature of the indoor air sucked into the indoor unit 4 and the like are detected.

(2-2) Ceiling-embedded indoor unit The indoor unit 4 according to the present embodiment may adopt a configuration called a ceiling-embedded type. FIG. 2 is an external perspective view of the ceiling-embedded indoor unit 4 according to this embodiment. FIG. 3 is a schematic sectional view of the ceiling-embedded indoor unit 4 according to the present embodiment. Here, FIG. 3 shows an AOA cross section in FIG. 4 to be described later. FIG. 4 is a schematic plan view showing a state in which the ceiling plate 33 of the ceiling-embedded indoor unit 4 according to the present embodiment is removed.

  The ceiling-embedded indoor unit houses the indoor fan 41 and the indoor heat exchanger 42 in the casing 31. A drain pan 40 is attached to the lower part of the casing 31.

(2-2-1) Casing The casing 31 accommodates various components inside. The casing 31 mainly has a casing main body 31a and a decorative panel 32 disposed on the lower side of the casing main body 31a. The casing main body 31a is arrange | positioned at the indoor ceiling U where conditioned air is provided, as FIG. 3 shows. An opening is formed in the ceiling U, and the casing body 31a is inserted into the opening of the ceiling U. And the decorative panel 32 is arrange | positioned so that it may fit in opening of the ceiling U. FIG.

  As shown in FIGS. 3 and 4, the casing main body 31 a is a box-like body having a substantially octagonal lower surface in which long sides and short sides are alternately formed in a plan view. Specifically, the casing main body 31 a includes a substantially octagonal top plate 33 in which long sides and short sides are alternately and continuously formed, and a side plate 34 extending downward from the peripheral edge of the top plate 33. Yes. The side plate 34 includes side plates 34 a, 34 b, 34 c and 34 d corresponding to the long sides of the top plate 33, and side plates 34 e, 34 f, 34 g and 34 h corresponding to the short sides of the top plate 33. Further, the side plate 34h has a portion through which the liquid side connection pipe 5a and the gas side connection pipe 6a penetrate, and the refrigerant communication pipes 5 and 6 can be connected to the indoor heat exchanger 42.

  As shown in FIGS. 2 to 4, the decorative panel 32 is a plate-like body having a substantially quadrangular shape in plan view, and mainly includes a panel body 32 a fixed to the lower end portion of the casing body 31 a. The panel main body 32a has an intake port 35 for sucking air in the air-conditioned room at a substantially center thereof, and an air outlet 36 for blowing air into the air-conditioned room formed so as to surround the periphery of the suction port 35 in plan view. The suction port 35 is a substantially quadrangular opening. The suction port 35 is provided with a suction grill 37 and a filter 38 for removing dust in the air sucked from the suction port 35. The air outlet 36 is a substantially quadrangular annular opening. The air outlet 36 is provided with horizontal flaps 39a, 39b, 39c, and 39d that adjust the air direction of the air blown into the air conditioning chamber so as to correspond to the respective sides of the panel body 32a.

(2-2-2) Drain pan The drain pan 40 is a member for receiving drain water generated by condensation of moisture in the air in the indoor heat exchanger 42. The drain pan 40 is attached to the lower part of the casing body 31a. In the drain pan 40, blowout holes 40a, 40b, 40c, 40d, 40e, 40f, and 40g, a suction hole 40h, and a drain water receiving groove 40i are formed. The blowout holes 40 a to 40 g are formed so as to communicate with the blowout port 36 of the decorative panel 32. The suction hole 40 h is formed so as to communicate with the suction port 35 of the decorative panel 32. The drain water receiving groove 40 i is formed below the indoor heat exchanger 42. A bell mouth 41c for guiding the air sucked from the suction port 35 to the impeller 41b of the indoor fan is disposed in the suction hole 40h of the drain pan 40.

(2-2-3) Indoor fan The indoor fan 41 is constituted by a centrifugal blower. Here, the indoor fan 41 sucks indoor air into the casing body 31 a through the suction port 35 of the decorative panel 32 and blows it out from the casing body 31 a through the outlet 36 of the decorative panel 32. Specifically, the indoor fan 41 includes a fan motor 41a provided at the center of the top plate 33 of the casing body 31a, and an impeller 41b that is connected to the fan motor 41a and is driven to rotate. The impeller 41b has a turbo blade. The impeller 41b sucks air from below into the impeller 41b, and blows out the sucked air toward the outer peripheral side of the impeller 41b in plan view.

(2-2-4) Indoor Heat Exchanger The indoor heat exchanger 42 is bent inside the casing 31 so as to surround the indoor fan 41 in plan view. The liquid side of the indoor heat exchanger 42 is connected to the liquid refrigerant communication tube 5 via the liquid side connection tube 5a. The gas side of the indoor heat exchanger 42 is connected to the gas refrigerant communication pipe 6 via the gas side connection pipe 6a. The indoor heat exchanger 42 functions as a refrigerant evaporator during the cooling operation and as a refrigerant condenser during the heating operation. Thereby, the indoor heat exchanger 42 performs heat exchange between the air blown out from the indoor fan 41 and the refrigerant, cools the air during the cooling operation, and heats the air during the heating operation. A specific structure and characteristics of the indoor heat exchanger 42 will be described below.

(3) Specific form of indoor heat exchanger (3-1) Basic configuration of heat exchanger FIG. 5 is a schematic perspective view of a heat exchanger 42 a used in the indoor heat exchanger 42. FIG. 6 is a schematic longitudinal sectional view of a heat exchanger used in the heat exchanger 42a. In FIG. 5, the refrigerant pipe and the communication pipe are not shown.

  The heat exchanger 42a is an insertion fin type stacked heat exchanger mainly including a heat transfer tube 421 formed of a flat multi-hole tube, a large number of fins 422, and two headers 423 and 424.

  The heat transfer tube 421 is realized by a flat multi-hole tube. Here, both ends of the heat transfer tube 421 are connected to the headers 423 and 424, respectively. In addition, the heat transfer tubes 421 are arranged in a plurality of stages at intervals with the plane portion facing up and down. Specifically, the heat transfer tube 421 has upper and lower flat portions serving as heat transfer surfaces and a large number of small refrigerant flow paths 421a through which the refrigerant flows. As the coolant channel 421a, a circular channel having an inner diameter of 1 mm or less or a polygonal small channel hole having an equivalent cross-sectional area is used. The heat transfer tube 421 is formed of aluminum or an aluminum alloy.

  The fins 422 are inserted into a plurality of stages of heat transfer tubes 421 arranged between the headers 423 and 424. Specifically, the fin 422 is formed with a plurality of cutouts 422a that are elongated horizontally. Further, the shape of the notch 422a substantially matches the outer shape of the cross section of the heat transfer tube 421. Therefore, the notch 422a and the outer surface of the heat transfer tube 421 are engaged, so that the heat transfer tube 421 can be inserted. Note that the fins 422 are made of aluminum or an aluminum alloy. Further, the fin 422 can take various shapes, and for example, may have a waveform as shown in FIG.

  Each of the two headers 423 and 424 has a function of supporting the heat transfer tube 421, a function of guiding the refrigerant to the refrigerant flow path 421a of the heat transfer pipe 421, and a function of collecting the refrigerant that has come out of the refrigerant flow path 421a. I have it.

(3-2) Configuration of Heat Exchanger Unit The indoor heat exchanger 42 according to the present embodiment is configured by a heat exchanger unit in which a plurality of heat exchangers 42a having the above-described configuration are combined. In the following description, for convenience, a heat exchanger unit as an indoor exchanger will be described with “reference numeral 42”. The heat exchanger unit 42 includes at least a first heat exchanger 52 and a second heat exchanger 62. Here, although the 1st heat exchanger 52 and the 2nd heat exchanger 62 comprise the same structure as the heat exchanger 42a mentioned above, a code | symbol is replaced and demonstrated for convenience. Also, in the following description, when describing the configuration of the entire heat exchanger unit, the first numeral of the symbol is “4”, and when describing the first heat exchanger 52, the first numeral of the symbol is replaced with “5”. The second heat exchanger 62 will be described by replacing the first numeral with “6”. For example, the heat transfer tube of the first heat exchanger 52 and the heat transfer tube of the second heat exchanger 62 are heat transfer tubes having the same configuration, but are denoted by “reference numeral 521” or “reference numeral 621” instead of the reference numeral 421. To explain.

  FIG. 8 is a schematic diagram showing the configuration of the heat exchanger unit 42 according to the present embodiment. The heat exchanger unit 42 is arranged in parallel with the first heat exchanger 52 arranged on the leeward side of the air flow by the indoor fan (fan) 41 and on the leeward side of the air flow by the indoor fan 41. And a second heat exchanger 62 disposed in the same manner. Here, the first direction D1 of the refrigerant flow from the first header 523 of the first heat exchanger 52 toward the second header 524 and the refrigerant flow of the second heat exchanger 62 from the third header 623 toward the fourth header 624 are performed. It is assumed that the second direction D <b> 2 is opposite. In FIG. 8, for convenience of explanation, the first heat exchanger 52 and the second heat exchanger 62 are shown apart from each other, but these are arranged close enough to function as a unit. It is.

  The first heat exchanger 52 is a first flat tube comprising a first header 523 and a second header 524, and a plurality of flat multi-hole tubes (heat transfer tubes) connected to the first header 523 and the second header 524, respectively. A group 500. In the first flat tube group 500, a plurality of flat multi-hole tubes are lined up and down. The first header 523 is connected to a gas side connection pipe (gas refrigerant pipe) 6a through which a gaseous refrigerant flows. The second header 524 is connected to a liquid side connection pipe (liquid refrigerant pipe) 5a through which the liquid refrigerant flows.

  The second heat exchanger 62 includes a third header 623 and a fourth header 624, a second flat tube group 600 including a plurality of flat multi-hole tubes connected to the third header 623 and the fourth header 624, and Have In the second flat tube group 600, a plurality of flat multi-hole tubes are lined up and down. In the second flat tube group 600, as shown in FIGS. 8 and 9, one or more flat multi-hole tubes on the upper side form an upper second heat exchange region 600U, and one or more flat multi-hole tubes on the lower side. Forms the lower second heat exchange region 600L. Here, the area of the upper second heat exchange region 600U is configured to be larger than the area of the lower second heat exchange region 600L.

  As shown in FIGS. 8 and 9, the third header 623 includes an upper third header 623U connected to the upper second heat exchange area 600U, and a lower third header 623L connected to the lower second heat exchange area 600L. Have Specifically, the inner space of the third header 623 is partitioned vertically (two here) by the partition plate 623a. The upper space 623g of the partition plate 623a is connected to the upper second heat exchange region 600U, and the lower space 623h of the partition plate 623a is connected to the lower second heat exchange region 600L. Further, the gas side connecting pipe 6a is connected to the upper third header 623U. The liquid side connection pipe 5a is connected to the lower third header 623L.

  As shown in FIGS. 8 and 9, the fourth header 624 includes an upper fourth header 624U connected to the upper second heat exchange area 600U, and a lower fourth header 624L connected to the lower second heat exchange area 600L. Have Specifically, the fourth header 624 has an internal space divided vertically (two here) by a partition plate 624a. The upper space 624i of the partition plate 624a is connected to the upper second heat exchange region 600U, and the lower space 624j of the partition plate 624a is connected to the lower second heat exchange region 600L. The fourth header 624 includes a “folding portion” that connects the upper fourth header 624U and the lower fourth header 624L and folds the refrigerant flowing from the third header 623 side back to the third header 623 side. Specifically, the fourth header 624 includes a connecting pipe 625 that connects the upper fourth header 624U and the lower fourth header 624L as a folded portion. The connecting pipe 625 is attached with a temperature measuring device for measuring the temperature of the refrigerant.

(3-3) Features of heat exchanger unit (3-3-1)
When the heat exchanger unit 42 as described above is used as a condenser, the internal state of the heat exchange region is as shown in FIGS. Here, FIG. 11 shows the heat exchange when the heat exchanger unit 42 is bent and viewed in a cross section of the connection portion between the gas side connection pipe 6a (gas refrigerant pipe) and the liquid side connection pipe 5a (liquid refrigerant pipe). It is a schematic diagram which shows the state of an area | region. That is, it is a figure which shows the state of the heat exchange area | region when the heat exchanger unit 42 is seen from the side plate 34h direction of the casing main body 31a. In these FIGS. 10 and 11, hatching of the regions Sc1 and Sc2 indicates a supercooling region where the refrigerant is supercooled, and hatching of the regions Sh1 and Sh2 indicates an overheating region where the refrigerant is overheated. .

  In short, the heat exchanger unit 42 according to the present embodiment includes the first heat exchanger 52 on the leeward side, the second heat exchanger 62 on the leeward side, and the second heat exchanger 62 on the leeward side. Since the 4th header 624 has the connection pipe 625 (folding part) which turns back the flow of a refrigerant, when heat exchanger unit 42 is used as a condenser, from the space behind superheat field Sh1 of the 1st heat exchanger 52 The at least part of the supercooling region Sc2 of the second heat exchanger can be arranged so as not to overlap. Thereby, when the heat exchanger unit 42 is used as a condenser, the amount of refrigerant cooled in the supercooling region Sc2 can be increased in the second heat exchanger 62 on the leeward side. As a result, the heat exchange performance in the air conditioner 1 can be improved.

(3-3-2)
More specifically, in the second flat tube group 600 of the heat exchanger unit 42 according to the present embodiment, a plurality of flat multi-hole tubes are arranged vertically. And the connecting pipe 625 (folding part) connects the upper fourth header 624U and the lower fourth header 624L, and the refrigerant flowing from the third header 623 side is folded back to the third header 623 side.

  With such a configuration, when the heat exchanger unit 42 is used as a condenser, at least one of the supercooling regions Sc2 of the second heat exchanger 62 from the space behind the superheated region Sh1 of the first heat exchanger 52. It can arrange | position so that a part may not overlap.

(3-3-3)
Further, in the heat exchanger unit 42 according to the present embodiment, the fourth header 624 includes a connecting pipe 625 (a folded portion) that connects the upper fourth header 624U and the lower fourth header 624L. Here, when the connection port of the connecting pipe 625 is adjusted (for example, the connecting pipe 625 is connected to the lower side of the upper fourth header 624U), the refrigerant is flown from the bottom when the heat exchanger unit 42 is used as an evaporator. The refrigerant can be flown so as to blow up, and the drift can be improved.

  Note that a temperature measuring instrument for measuring the temperature of the refrigerant may be attached to the connecting pipe 625. With such a configuration, the temperature of the refrigerant flowing inside the second heat exchanger 62 can be grasped. And the heat exchange performance of the air conditioning apparatus 1 can further be improved by optimizing the state of a refrigerant | coolant based on the measured value by a temperature measuring device.

  However, the temperature measuring instrument is not limited to the configuration attached to the connecting pipe 625, and may be configured to be attached to the fourth header 624.

(3-3-4)
Further, in the heat exchanger unit 42 according to the present embodiment, the first direction D1 of the refrigerant flow from the first header 523 toward the second header 524 and the second refrigerant flow from the third header 623 toward the fourth header 624 are performed. The direction D2 is opposed. The first header 523 and the upper third header 623U are connected to a gas side connection pipe 6a (gas refrigerant pipe) through which a gaseous refrigerant flows. The second header 524 and the lower third header 623L are connected to a liquid side connection pipe 5a (liquid refrigerant pipe) through which the liquid refrigerant flows.

  Therefore, in the heat exchanger unit 42 according to the present embodiment, the flow direction of the refrigerant flowing through the first heat exchanger 52 on the windward side and the second heat exchanger 62 on the leeward side are opposed to each other. It is possible to reduce the temperature unevenness of the air that has passed through.

  On the other hand, when the flow directions of the refrigerant flowing through the first heat exchanger 52 and the second heat exchanger 62 face each other, the temperature difference between the air and the refrigerant in the supercooling region Sc2 of the second heat exchanger 62. Is difficult to secure. On the other hand, in the heat exchanger unit 42 according to the present embodiment, the second heat exchanger 62 includes the connecting pipe 625 (folding portion). Therefore, when the heat exchanger unit 42 is used as a condenser, the first heat It can arrange | position so that the supercooling area | region Sc2 of the 2nd heat exchanger 62 may not overlap from the space behind the superheat area | region Sh1 of the exchanger 52 (refer FIG. 10, 11). Furthermore, it can arrange | position so that the supercooling area | region Sc2 of the 2nd heat exchanger 62 may overlap with the space behind the supercooling area | region Sc1 of the 1st heat exchanger 52 (refer FIG. 10, 11). Thereby, when the heat exchanger unit 42 is used as a condenser, the amount of refrigerant cooled in the supercooling region Sc2 of the second heat exchanger 62 can be further increased.

(3-3-5)
Further, in the heat exchanger unit 42 according to the present embodiment, the area of the upper second heat exchange region 600U is larger than the area of the lower second heat exchange region 600L. Therefore, the refrigerant flow rate in the lower second heat exchange region 600L is increased, and the heat transfer efficiency is improved.

  However, the heat exchanger unit 42 according to the present embodiment can be realized even when the area of the lower second heat exchange region 600L is larger than the area of the upper second heat exchange region 600U.

(3-3-6)
Further, in the heat exchanger unit 42 according to this embodiment, the first heat exchanger 52 and the second heat exchanger 62 are bent between the headers. Here, as shown in FIG. 12, the first heat exchanger 52 and the second heat exchanger 62 are bent at at least three locations between the headers and have a substantially rectangular shape in plan view. The first heat exchanger 52 and the second heat exchanger 62 have a shape surrounding the indoor fan 41.

Thus, since the heat exchanger unit 42 is bent between the headers, it can be installed at a desired location. In particular, in the case of a substantially square shape in plan view, the air conditioner 1 that can provide conditioned air radially can be realized by installing the indoor fan 41 inside.
The “substantially square shape” referred to here does not mean only a perfect rectangle, but an arbitrary shape formed by a set of two parallel sides. Therefore, the substantially quadrangular shape includes those in which the corners are rounded and those in which the corners are cut.

(3-4) Modification of heat exchanger unit (3-4-1) Modification 1A
In the above description, as a specific example, the configuration in which the second heat exchanger 62 is folded once by the connecting pipe 625 has been described, but the heat exchanger unit 42 according to the present embodiment is limited to this configuration. is not. For example, as shown in FIG. 13, the inside of the third header 623 and the fourth header 624 of the second heat exchanger 62 may be divided into multiple stages so that the refrigerant is diffracted many times. Even in such a configuration, when the heat exchanger unit 42 is used as a condenser, the supercooling region Sc2 of the second heat exchanger 62 is removed from the space behind the superheat region Sh1 of the first heat exchanger 52. It is possible to arrange so that at least a part of them does not overlap.

(3-4-2) Modification 1B
In the above description, as a specific example, the first heat exchanger 52 does not have a folded structure, but the heat exchanger unit 42 according to the present embodiment is not limited to this configuration. For example, the first heat exchanger 52 may be divided into multiple stages and have a configuration in which a large number of refrigerants are folded back. Further, as shown in FIG. 14, both the first heat exchanger 52 and the second heat exchanger 62 may have a configuration in which a large number of diffraction is performed. Even in such a configuration, when the heat exchanger unit 42 is used as a condenser, the supercooling region Sc2 of the second heat exchanger 62 is removed from the space behind the superheat region Sh1 of the first heat exchanger 52. It is possible to arrange so that at least a part of them does not overlap.

(3-4-3) Modification 1C
In the above description, the first direction D1 and the second direction D2 are opposed to each other. However, the heat exchanger unit 42 according to the present embodiment is not limited to this configuration. For example, as shown in FIG. 15, the first direction D1 and the second direction D2 may be the same direction. Even in such a configuration, when the heat exchanger unit 42 is used as a condenser, the supercooling region Sc2 of the second heat exchanger 62 is removed from the space behind the superheat region Sh1 of the first heat exchanger 52. It is possible to arrange so that at least a part of them does not overlap.

(3-4-4) Modification 1D
In the above description, the structure in which the second heat exchanger 62 is folded back by the connecting pipe 625 has been described. However, the second heat exchanger 62 according to the present embodiment is not limited to this configuration. For example, as shown in FIG. 16, the refrigerant may be folded back by not arranging the partition plate 624 a inside the fourth header 624. Moreover, as shown in FIG. 17, it is good also as a structure which folds a refrigerant | coolant by providing several partition plates and several connection pipes 625a and 625b inside the 4th header 624. FIG. In short, the “folding portion” according to the present embodiment can take any form as long as the refrigerant flowing from the third header 623 side is folded back to the third header 623 side in the fourth header 624. .

(3-4-5) Modification 1E
In the above description, each of the headers 523, 524, 623, and 624 is configured as a separate member, but nearby headers may be configured integrally. For example, in the example of the configuration illustrated in FIG. 8, the first header 523 and the fourth header 624, and the second header 524 and the third header 623 may be configured integrally. In the example of the configuration illustrated in FIG. 15, the first header 523 and the third header 623, and the second header 524 and the fourth header 624 may be configured integrally. In short, as long as the heat exchanger unit 42 according to the present embodiment has the above-described function, the heat exchanger unit 42 may be realized by a single header without being a separate header.

(3-4-6) Modification 1F
In the above description, the temperature measuring device is attached to the connecting pipe 625. However, the heat exchanger unit 42 according to the present embodiment is not limited to this configuration. For example, various measuring devices other than the temperature measuring device may be attached.

(3-4-7) Modification 1G
In the above description, the first heat exchanger 52 and the second heat exchanger 62 have a substantially rectangular shape in plan view, but the heat exchanger unit 42 according to the present embodiment is limited to this configuration. is not. For example, the heat exchanger unit 42 may have a flat plate shape or a curved plate shape.

(3-4-8) Modification 1H
In the above description, the ceiling-embedded heat exchanger unit 42 has been described, but the heat exchanger unit according to the present embodiment is not limited to this. The heat exchanger unit 42 according to the present embodiment can be mounted not only on a ceiling-embedded indoor unit but also on a duct-type or ceiling-suspended indoor unit, for example. Further, the configuration of the heat exchanger unit 42 according to the present embodiment may be applied to the outdoor heat exchanger 23 of the outdoor unit 2.

Second Embodiment
Hereinafter, the same parts as those already described are denoted by substantially the same reference numerals, and redundant description is omitted. In addition, in order to distinguish with other embodiment, the subscript S may be attached | subjected in this embodiment.

  The air conditioner 1S according to the second embodiment of the present invention is different from the air conditioner 1 according to the first embodiment in the specific form of the indoor heat exchanger. Other configurations of the air conditioner 1S according to the second embodiment are the same as those of the air conditioner 1 according to the first embodiment.

(4) Specific form of indoor heat exchanger The indoor heat exchanger which concerns on this embodiment is comprised by the heat exchanger unit 42S. The basic configuration of the heat exchanger 42a in the heat exchanger unit 42S is the same as that in the first embodiment.

(4-1) Configuration of Heat Exchanger Unit FIG. 18 is a schematic diagram for explaining the configuration of a heat exchanger unit 42S according to the second embodiment of the present invention.

  In the heat exchanger unit 42S according to the present embodiment, the first heat exchanger 52S is arranged on the windward side of the air flow by the indoor fan 41. In addition, the second heat exchanger 62S is arranged in parallel with the first heat exchanger 52 on the leeward side of the air flow by the indoor fan 41. Here, the 1st direction D1 which goes to the 2nd header 524 from the 1st header 523 of the 1st heat exchanger 52S, and the 2nd direction D2 which goes to the 4th header 624 from the 3rd header 623 of the 2nd heat exchanger 62S Shall face each other. In FIG. 18, for convenience of explanation, the first heat exchanger 52S and the second heat exchanger 62S are shown apart from each other, but these are arranged close enough to function as a unit. It is.

  The first heat exchanger 52S is a first flat tube including a first header 523 and a second header 524, and a plurality of flat multi-hole tubes (heat transfer tubes) connected to the first header 523 and the second header 524, respectively. A group 500. In the first flat tube group 500, a plurality of flat multi-hole tubes are lined up and down. In the first flat tube group 500, the upper one or more flat multi-hole tubes form the upper first heat exchange region 500U, and the lower one or more flat multi-hole tubes are the lower first heat exchange region 500L. Form. Here, the area of the upper first heat exchange region 500U is configured to be larger than the area of the lower first heat exchange region 500L.

  As shown in FIGS. 18 and 19, the first header 523 has the same configuration as the third header 623 in the first embodiment. That is, the first header 523 includes an upper first header 523U connected to the upper first heat exchange region 500U and a lower first header 523L connected to the lower first heat exchange region 500L. The upper first header 523U is connected to a gas side connection pipe 6a (gas refrigerant pipe) through which a gaseous refrigerant flows. The lower first header 523L is connected to a liquid side connection pipe 5a (liquid refrigerant pipe) through which the liquid refrigerant flows.

  As shown in FIGS. 18 and 19, the second header 524 has the same configuration as the fourth header 624 in the first embodiment. Specifically, the second header 524 includes an upper second header 524U connected to the upper first heat exchange region 500U and a lower second header 524L connected to the lower first heat exchange region 500L. Specifically, the internal space of the second header 524 is partitioned into upper and lower portions (here, two) by the partition plate 524a. The upper space 524i of the partition plate 524a is connected to the upper first heat exchange region 500U, and the lower space 524j of the partition plate 524a is connected to the lower first heat exchange region 500L. Further, the second header 524 connects the upper second header 524U and the lower second header 524L, and a “second folding portion” that folds the refrigerant flowing in from the first header 523 side to the first header 523 side. Have. Specifically, the second header 524 includes a connecting pipe 525 (second connecting pipe) that connects the upper second header 524U and the lower second header 524L as a second folded portion. The connecting pipe 525 is attached with a temperature measuring device for measuring the temperature of the refrigerant.

  The second heat exchanger 62S has the same configuration as the second heat exchanger 62 in the first embodiment.

(4-2) Features of heat exchanger unit (4-2-1)
When the heat exchanger unit 42S having the above-described configuration is used as a condenser, the internal state of the heat exchange region is as shown in FIGS. Here, FIG. 21 shows a state in which the form of the heat exchanger unit 42 is folded and viewed in a cross section of a connection portion between the gas side connection pipe 6a (gas refrigerant pipe) and the liquid side connection pipe 5a (liquid refrigerant pipe). It is a schematic diagram which shows the state of a heat exchange area | region.

  In short, in the heat exchanger unit 42S according to the present embodiment, the fourth header 624 of the second heat exchanger 62S on the leeward side has the connection pipe 625 (folding portion) for turning back the refrigerant flow, and the first on the windward side. Since the second header 524 of the heat exchanger 52S has a connection pipe 525 (second return portion, second connection pipe) that turns back the refrigerant flow, when the heat exchanger unit 42S is used as a condenser, It can arrange | position so that at least one part of the supercooling area | region Sc2 of the 2nd heat exchanger 62S may not overlap from the space behind the superheat area | region Sh1 of the 1st heat exchanger 52S. Thereby, when the heat exchanger unit 42 is used as a condenser, the amount of refrigerant cooled in the supercooling region Sc2 can be increased in the second heat exchanger 62S on the leeward side.

(4-2-2)
More specifically, in the first flat tube group 500 of the heat exchanger unit 42S according to the present embodiment, a plurality of flat multi-hole tubes are lined up and down. Here, in the first flat tube group 500, one or more flat multi-hole tubes on the upper side form the upper first heat exchange region 500U, and one or more flat multi-hole tubes on the lower side are the lower first heat exchange region. 500L is formed. The second header 524 includes an upper second header 524U and a lower second header 524L that are connected to the upper first heat exchange region 500U and the lower first heat exchange region 500L, respectively. And the connecting pipe 525 (2nd folding | turning part) connects the upper side 2nd header 524U and the lower side 2nd header 524L, and folds the refrigerant | coolant which flows in from the 1st header 523 side to the 1st header 523 side. .

  Therefore, when the heat exchanger unit 42S is used as a condenser, at least a part of the supercooling region Sc2 of the second heat exchanger 62S does not overlap from the space behind the superheating region Sh1 of the first heat exchanger 52S. Can be arranged as follows. Furthermore, in the heat exchanger unit 42S according to the present embodiment, at least a part of the supercooling region Sc2 of the second heat exchanger 62 overlaps the space behind the supercooling region Sc1 of the first heat exchanger 52. Can be arranged. Thereby, the refrigerant | coolant amount cooled by the supercooling area | region Sc2 of the 2nd heat exchanger 62 can further be increased.

(4-2-3)
Further, in the heat exchanger unit 42S according to this embodiment, the refrigerant flow first direction D1 from the first header 523 toward the second header 524 and the refrigerant flow second direction D2 from the third header 623 toward the fourth header 624 are performed. Are facing each other. And the gas side connecting pipe 6a (gas refrigerant piping) through which a gaseous refrigerant flows is connected to the upper first header 523U and the upper third header 623U. Further, a liquid side connection pipe 5a (liquid refrigerant pipe) through which the liquid refrigerant flows is connected to the lower first header 523L and the lower third header 623L.

  Therefore, in the heat exchanger unit 42S according to the present embodiment, the flow direction of the refrigerant flowing through the first heat exchanger 52S on the leeward side and the second heat exchanger 62S on the leeward side are opposed to each other, so the heat exchanger unit 42S. It is possible to reduce the temperature unevenness of the air that has passed through.

  On the other hand, when the flow directions of the refrigerant flowing through the first heat exchanger 52S and the second heat exchanger 62S face each other, the temperature difference between the air and the refrigerant in the supercooling region Sc2 of the second heat exchanger 62S. Is difficult to secure. On the other hand, in the heat exchanger unit 42S of this embodiment, since the second header 524 of the first heat exchanger 52S has the connecting pipe 525 (second folded portion), the heat exchanger unit 42S is used as a condenser. When this happens, at least a part of the supercooling region Sc2 of the second heat exchanger 62S can be arranged so as not to overlap from the space behind the superheating region Sh1 of the first heat exchanger 52S (FIGS. 20 and 21). reference). Furthermore, in the heat exchanger unit 42S according to the present embodiment, the supercooling region Sc2 of the second heat exchanger 62S may be disposed so as to overlap the space behind the supercooling region Sc1 of the first heat exchanger 52S. (See FIGS. 20 and 21). Thereby, when the heat exchanger unit 42S is used as a condenser, the amount of refrigerant cooled in the supercooling region Sc2 of the second heat exchanger 62S can be further increased.

(4-2-4)
Further, in the heat exchanger unit 42S according to the present embodiment, the area of the upper first heat exchange region 500U is larger than the area of the lower first heat exchange region 500L. Therefore, the refrigerant flow rate in the lower first heat exchange region 500L is increased, and the heat transfer efficiency is improved.

  However, the heat exchanger unit 42S according to the present embodiment can be realized even when the area of the lower first heat exchange region 500L is larger than the area of the upper first heat exchange region 500U.

(4-2-5)
As described above, in the heat exchanger unit 42S according to the present embodiment, the second header 524 is connected to the connecting pipe 525 (second folded portion, second connecting the upper second header 524U and the lower second header 524L). Connection pipe). Here, when the connection port of the connecting pipe 525 is adjusted (for example, the connecting pipe 525 is connected to the lower side of the upper second header 524U), the refrigerant is flown from the bottom when the heat exchanger unit 42S is used as an evaporator. The refrigerant can be flown so as to blow up, and the drift can be improved.

  Note that a temperature measuring instrument for measuring the temperature of the refrigerant may be attached to the connecting pipe 525. With such a configuration, the temperature of the refrigerant flowing inside the first heat exchanger 52S can be grasped. And the heat exchange performance of the air conditioning apparatus 1S can be further improved by optimizing the state of the refrigerant based on the measured value by the temperature measuring instrument.

  However, the temperature measuring instrument is not limited to the configuration attached to the connecting pipe 525, and may be configured to be attached to the second header 524.

(4-2-6)
Further, in the heat exchanger unit 42S according to the present embodiment, the first heat exchanger 52S and the second heat exchanger 62S are bent between the headers. Here, as shown in FIG. 22, the first heat exchanger 52S and the second heat exchanger 62S are bent at at least three locations between the headers and have a substantially rectangular shape in plan view. The first heat exchanger 52S and the second heat exchanger 62S have a shape surrounding the indoor fan 41.

Thus, since the heat exchanger unit 42S is bent between the headers, it can be installed at a desired location. In particular, in the case of a substantially square shape in plan view, the air conditioner 1 that can provide conditioned air radially can be realized by installing the fan 41 inside.
The “substantially square shape” referred to here does not mean only a perfect rectangle, but an arbitrary shape formed by a set of two parallel sides. Therefore, the substantially quadrangular shape includes those in which the corners are rounded and those in which the corners are cut.

(4-3) Modification of heat exchanger unit (4-3-1) Modification 2A
In the above description, a specific example in which the first heat exchanger 52S is configured to be folded once by the connecting pipe 525 has been described, but the heat exchanger unit 42S according to the present embodiment is limited to this configuration. is not. For example, as shown in FIG. 23, the inside of the first header 523 and the second header 524 of the first heat exchanger 52S may be divided into multiple stages, and the refrigerant may be folded back many times. Even in such a configuration, when the heat exchanger unit 42S is used as a condenser, the supercooling region Sc2 of the second heat exchanger 62 is removed from the space behind the superheat region Sh1 of the first heat exchanger 52. It is possible to arrange so that at least a part of them does not overlap.

(4-3-2) Modification 2B
In the above description, as a specific example, the first heat exchanger 52 and the second heat exchanger 62S are configured so as to be divided into upper and lower parts. However, the heat exchanger unit 42S according to the present embodiment is not The configuration is not limited. For example, as shown in FIG. 24, both the first heat exchanger 52S and the second heat exchanger 62S may be divided into multiple stages and have a configuration in which the refrigerant is diffracted many times. Even in such a configuration, when the heat exchanger unit 42S is used as a condenser, the supercooling region Sc2 of the second heat exchanger 62S is taken from the space behind the superheating region Sh1 of the first heat exchanger 52S. It is possible to arrange so that at least a part of them does not overlap.

(4-3-3) Modification 2C
In the above description, the first direction D1 and the second direction D2 are opposed to each other. However, the heat exchanger unit according to the present embodiment is not limited to this configuration. For example, as shown in FIG. 25, the first direction D1 and the second direction D2 may be the same direction. Even in such a configuration, when the heat exchanger unit 42S is used as a condenser, the supercooling region Sc2 of the second heat exchanger 62S is taken from the space behind the superheating region Sh1 of the first heat exchanger 52S. It is possible to arrange so that at least a part of them does not overlap.

  Moreover, in such arrangement | positioning, it arrange | positions so that the supercooling area | region Sc2 of the 2nd heat exchanger 62S may overlap with the space behind the supercooling area | region Sc1 of the 1st heat exchanger 52S. Thereby, when the heat exchanger unit 42S is used as a condenser, the amount of refrigerant cooled in the supercooling region Sc2 can be further increased in the second heat exchanger 62S.

(4-3-4) Modification 2D
In the above description, the first heat exchanger 52S has a structure that is folded back by the connecting pipe 525. However, the first heat exchanger 52S according to the present embodiment is not limited to this configuration. For example, the refrigerant may be folded back by disposing the partition plate 524a inside the second header 524 (similar to the configuration shown in FIG. 15). Moreover, it is good also as a structure which provides a some partition plate and a some connection pipe in the inside of the 2nd header 524, and turns up a refrigerant | coolant (similar structure to the structure shown in FIG. 17). In short, the “second folding portion” according to the present embodiment can take any form as long as the refrigerant flowing from the first header 523 side is folded back to the first header 523 side in the second header 524. It is.

(4-3-5) Modification 2E
In the above description, each of the headers 523, 524, 623, and 624 is configured as a separate member, but nearby headers may be configured integrally. For example, in the example of the configuration illustrated in FIG. 18, the first header 523 and the fourth header 624, and the second header 524 and the third header 623 may be configured integrally. In the example of the configuration illustrated in FIG. 25, the first header 523 and the third header 623, and the second header 524 and the fourth header 624 may be configured integrally. In short, the heat exchanger unit 42S according to the present embodiment may be realized by a single header without being a separate header as long as it has the above-described function.

(4-3-6) Modification 2F
In the above description, the temperature measuring device is attached to the connecting pipe 525. However, the heat exchanger unit 42S according to the present embodiment is not limited to this configuration. For example, various measuring devices other than the temperature measuring device may be attached.

(4-3-7) Modification 2G
In the above description, the first heat exchanger 52S and the second heat exchanger 62S have a substantially rectangular shape in plan view, but the heat exchanger unit 42S according to the present embodiment is limited to this configuration. is not. For example, the heat exchanger unit 42S may have a flat plate shape or a curved plate shape.

(4-3-8) Modification 2H
In the above description, the ceiling-embedded heat exchanger unit 42S has been described, but the heat exchanger unit according to the present embodiment is not limited to this. The heat exchanger unit 42 according to the present embodiment can be mounted not only on a ceiling-embedded indoor unit but also on a duct-type or ceiling-suspended indoor unit, for example. Further, the configuration of the heat exchanger unit 42S according to the present embodiment may be applied to the outdoor heat exchanger 23 of the outdoor unit 2.

<Third Embodiment>
Hereinafter, the same parts as those already described are denoted by substantially the same reference numerals, and redundant description is omitted. In addition, in order to distinguish from other embodiment, the subscript W may be attached | subjected in this embodiment.

  The air conditioner 1W according to the third embodiment of the present invention is different from the air conditioner 1 according to the first embodiment in the specific form of the indoor heat exchanger. Other configurations of the air conditioner 1W according to the third embodiment are the same as those of the air conditioner 1 according to the first embodiment.

(5) Specific form of indoor heat exchanger The indoor heat exchanger according to this embodiment includes a heat exchanger unit 42W. The basic configuration of the heat exchanger 42a in the heat exchanger unit 42S is the same as that in the first embodiment.

(5-1) Configuration of Heat Exchanger Unit FIG. 26 is a schematic diagram for explaining the configuration of the heat exchanger unit 42W according to the third embodiment of the present invention.

  In the heat exchanger unit 42 </ b> W according to the present embodiment, the first heat exchanger 52 </ b> W is disposed on the windward side of the air flow by the indoor fan 41. In addition, the second heat exchanger 62W is arranged in parallel with the first heat exchanger 52W on the leeward side of the air flow by the indoor fan 41. Here, the 1st direction D1 which goes to the 2nd header 524 from the 1st header 523 of the 1st heat exchanger 52W, and the 2nd direction D2 which goes to the 4th header 624 from the 3rd header 623 of the 2nd heat exchanger 62W Shall face each other. In FIG. 26, for convenience of explanation, the first heat exchanger 52W and the second heat exchanger 62W are shown separated from each other, but these are arranged sufficiently close to function as one body. It is.

  The first heat exchanger 52W is a first flat tube comprising a first header 523 and a second header 524, and a plurality of flat multi-hole tubes (heat transfer tubes) connected to the first header 523 and the second header 523, respectively. A group 500. In the first flat tube group 500, a plurality of flat multi-hole tubes are lined up and down. Further, in the first flat tube group 500, as shown in FIGS. 26 and 27, one or more flat multi-hole tubes on the upper side form an upper first heat exchange region 500U, and one or more flat multi-hole tubes on the lower side. Forms the lower first heat exchange region 500L. Here, the area of the upper first heat exchange region 500U is configured to be larger than the area of the lower first heat exchange region 500L.

  As shown in FIGS. 26 and 27, the first header 523 includes an upper first header 523U connected to the upper first heat exchange region 500U, and a lower first header 523L connected to the lower first heat exchange region 500L. Have A gas side connection pipe 6a (gas refrigerant pipe) through which a gaseous refrigerant flows is connected to the upper first header 523U. A connecting pipe 425 is connected to the lower first header 523L. Thereby, the lower first header 523L and the upper fourth header 624U are connected. Note that the internal space of the first header 523 is divided into upper and lower parts (here, two) by a partition plate 523a. Accordingly, the upper first header 523U and the lower first header 523L are configured not to communicate with each other.

  26 and 27, the second header 524 includes an upper second header 524U connected to the upper first heat exchange region 500U, and a lower second header 524L connected to the lower first heat exchange region 500L. Have A connecting pipe 426 is connected to the upper second header 524U. Thus, the upper second header 524U and the lower third header 623L are connected. The lower second header 524L is connected to a liquid side connection pipe 5a through which a liquid refrigerant flows. The internal space of the second header 524 is partitioned vertically (two here) by the partition plate 524a. Accordingly, the upper second header 524U and the lower second header 524L are configured not to communicate with each other.

  The second heat exchanger 62W includes a third header 623 and a fourth header 624, and a second flat tube including a plurality of flat multi-hole tubes (heat transfer tubes) connected to the third header 623 and the fourth header 624, respectively. A group 600. In the second flat tube group 600, a plurality of flat multi-hole tubes are lined up and down. In the second flat tube group 600, as shown in FIGS. 26 and 28, one or more flat multi-hole tubes on the upper side form an upper second heat exchange region 600U, and one or more flat multi-hole tubes on the lower side. Forms the lower second heat exchange region 600L. Here, the area of the upper second heat exchange region 600U is configured to be larger than the area of the lower second heat exchange region 600L.

  As shown in FIGS. 26 and 28, the third header 623 includes an upper third header 623U connected to the upper second heat exchange area 600U, and a lower third header 623L connected to the lower second heat exchange area 600L. Have A gas side connection pipe 6a (gas refrigerant pipe) through which a gaseous refrigerant flows is connected to the upper third header 623U. Further, a connecting pipe 426 is connected to the lower third header 623L. Thereby, the lower third header 623L and the upper second header 524U are connected. The third header 623 is partitioned into upper and lower (here, two) internal spaces by a partition plate 623a. As a result, the upper third header 623U and the lower third header 623L do not communicate with each other inside.

  As shown in FIGS. 26 and 28, the fourth header 624 includes an upper fourth header 624U connected to the upper second heat exchange region 600U, and a lower fourth header 624L connected to the lower second heat exchange region 600L. Have A connecting pipe 425 is connected to the upper fourth header 624U. Thereby, the upper fourth header 624U and the lower first header 523L are connected. The lower fourth header 624L is connected to a liquid side connection pipe 5a through which a liquid refrigerant flows. The fourth header 624 has an internal space divided vertically (in this case, two) by a partition plate 624a. Accordingly, the upper fourth header 624U and the lower fourth header 624L are configured not to communicate with each other.

  The connecting pipe 425 flows out the refrigerant flowing into the upper fourth header 624U to the lower first header 523L. The connecting pipe 425 is attached with a temperature measuring device for measuring the temperature of the refrigerant.

  The connecting pipe 426 flows out the refrigerant flowing into the upper second header 524U to the lower third header 623L. The connecting pipe 426 is attached with a temperature measuring device for measuring the temperature of the refrigerant.

(5-2) Features of heat exchanger unit (5-2-1)
When the heat exchanger unit 42W as described above is used as a condenser, the internal state of the heat exchange region is as shown in FIGS. Here, FIG. 30 shows a cross section of the connection portion between the gas side connecting pipe 6a (gas refrigerant pipe) and the liquid side connecting pipe 5a (liquid refrigerant pipe) by bending the form of the heat exchanger unit 42W. It is a schematic diagram which shows the state of a heat exchange area | region.

  In short, in the heat exchanger unit 42W according to the present embodiment, the first heat exchanger 52W is provided on the leeward side, the second heat exchanger 62W is provided on the leeward side, and the second heat exchanger 62W on the leeward side is provided. The upper fourth header 624U has a connecting pipe 425 that folds the refrigerant flow back to the lower first header 523L, and the upper second header 524U of the windward first heat exchanger 52W transmits the refrigerant flow to the lower third header. Since the connecting pipe 426 is folded back to 623L, when the heat exchanger unit 42W is used as a condenser, from the space behind the superheat region Sh1 of the first heat exchanger 52W, the supercooling region Sc2 of the second heat exchanger It is possible to arrange so that at least a part of them does not overlap. Thereby, when the heat exchanger unit 42W is used as a condenser, the amount of refrigerant cooled in the supercooling region Sc2 can be increased in the second heat exchanger 62W on the leeward side. Furthermore, in the heat exchanger unit 42W according to the present embodiment, at least a part of the supercooling region Sc2 of the second heat exchanger 62W overlaps the space behind the supercooling region Sc1 of the first heat exchanger 52W. Can be arranged. Thereby, the refrigerant | coolant amount cooled in the supercooling area | region Sc2 of the 2nd heat exchanger 62W can further be increased.

(5-2-2)
A temperature measuring instrument for measuring the temperature of the refrigerant may be attached to each of the connecting pipes 425 and 426 described above. With such a configuration, the temperature of the refrigerant flowing inside the first heat exchanger 52W and the second heat exchanger 62W can be grasped. And the heat exchange performance of the air conditioning apparatus 1 can further be improved by optimizing the state of a refrigerant | coolant based on the measured value by a temperature measuring device.

  However, the temperature measuring instrument is not limited to being attached to the connecting pipes 425 and 426, but may be attached to the headers 523, 524, 623, and 624.

(5-2-3)
Further, in the heat exchanger unit 42W according to the present embodiment, the first direction D1 of the refrigerant flow from the first header 523 to the second header 524 and the second refrigerant flow from the third header 623 to the fourth header 624. The direction D2 is opposed.

  Therefore, in the heat exchanger unit 42W according to the present embodiment, the flow of the gaseous refrigerant flowing into the first heat exchanger 52W on the leeward side and the gaseous refrigerant flowing into the second heat exchanger 62W on the leeward side are performed. opposite. Here, since the flow directions of the refrigerant flowing through the first heat exchanger 52W and the second heat exchanger 62W are opposed to each other, it is possible to reduce the temperature unevenness of the air that has passed through the entire heat exchanger unit 42W.

  On the other hand, when the flow directions of the refrigerant flowing through the first heat exchanger 52W and the second heat exchanger 62W face each other, the temperature difference between air and the refrigerant in the supercooling region Sc2 of the second heat exchanger 62W. Is difficult to secure. In contrast, in the heat exchanger unit 42W according to the present embodiment, the first heat exchanger 52W is provided on the leeward side, the second heat exchanger 62W is provided on the leeward side, and the second heat exchanger on the leeward side is provided. The 62W upper fourth header 624U has a connecting pipe 425 that turns the refrigerant flow back to the lower first header 523L, and the upper second header 524U of the windward first heat exchanger 52W lowers the refrigerant flow to the lower first header 523U. 3 having a connecting pipe 426 that turns back to the header 623L, when the heat exchanger unit 42 is used as a condenser, the second heat exchanger 62 is supercooled from the space behind the superheat region Sh1 of the first heat exchanger 52. The regions Sc2 can be arranged so as not to overlap. Moreover, it arrange | positions so that the supercooling area | region Sc2 of the 2nd heat exchanger 62 may become bulky in the space behind the supercooling area | region Sc1 of the 1st heat exchanger 52. FIG. Thereby, when the heat exchanger unit 42 is used as a condenser, in the second heat exchanger 62, the amount of refrigerant cooled in the supercooling region Sc2 can be further increased.

(5-2-4)
Further, in the heat exchanger unit 42W according to the present embodiment, the area of the upper second heat exchange region 600U is larger than the area of the lower second heat exchange region 600L. Therefore, the refrigerant flow rate in the lower second heat exchange region 600L is increased, and the heat transfer efficiency is improved.

  However, the heat exchanger unit 42W according to the present embodiment can be realized even when the area of the lower second heat exchange region 600L is larger than the area of the upper second heat exchange region 600U.

(5-2-5)
Further, in the heat exchanger unit 42W according to the present embodiment, the area of the upper first heat exchange region 500U is larger than the area of the lower first heat exchange region 500L. Therefore, the refrigerant flow rate in the lower first heat exchange region 500L is increased, and the heat transfer efficiency is improved.

  However, the heat exchanger unit 42W according to the present embodiment can be realized even when the area of the lower first heat exchange region 500L is larger than the area of the upper first heat exchange region 500U.

(5-2-6)
Further, in the heat exchanger unit 42W according to the present embodiment, the first heat exchanger 52W and the second heat exchanger 62W are bent between the headers. Here, as shown in FIG. 31, the first heat exchanger 52W and the second heat exchanger 62W are bent at at least three locations between the headers and have a substantially rectangular shape in plan view. The first heat exchanger 52W and the second heat exchanger 62W have a shape that surrounds the indoor fan 41.

Thus, since the heat exchanger unit 42W is bent between the headers, it can be installed at a desired installation location. In particular, in the case of a substantially square shape in plan view, the air conditioner 1 that can provide conditioned air radially can be realized by installing the indoor fan 41 inside.
The “substantially square shape” referred to here does not mean only a perfect rectangle, but an arbitrary shape formed by a set of two parallel sides. Therefore, the substantially quadrangular shape includes those in which the corners are rounded and those in which the corners are cut.

(5-3) Modification of heat exchanger unit (5-3-1) Modification 3A
In the above description, the first direction D1 and the second direction D2 are opposed to each other. However, the heat exchanger unit 42W according to the present embodiment is not limited to this configuration. For example, as shown in FIG. 32, the first direction D1 and the second direction D2 may be the same direction. Even in such a configuration, when the heat exchanger unit 42W is used as a condenser, the supercooling region Sc2 of the second heat exchanger 62 is separated from the space behind the superheat region Sh1 of the first heat exchanger 52W. It is possible to arrange so that at least a part of them does not overlap.

  Moreover, in such arrangement | positioning, it arrange | positions so that the supercooling area | region Sc2 of the 2nd heat exchanger 62W may overlap with the space behind the supercooling area | region Sc1 of the 1st heat exchanger 52W. Thereby, when the heat exchanger unit 42W is used as a condenser, the amount of refrigerant cooled in the supercooling region Sc2 can be further increased in the second heat exchanger 62W.

(5-3-2) Modification 3B
In the above description, each of the headers 523, 524, 623, and 624 is configured as a separate member, but nearby headers may be configured integrally. For example, in the example of the configuration illustrated in FIG. 26, the first header 523 and the fourth header 624, and the second header 524 and the third header 623 may be configured integrally. In the example of the configuration illustrated in FIG. 32, the first header 523 and the third header 623, and the second header 524 and the fourth header 624 may be configured integrally. In short, if the heat exchanger unit 42W according to the present embodiment has a function of each header, the heat exchanger unit 42W includes not only a separate header but also a component realized by a single header.

(5-3-3) Modification 3C
In the above description, the temperature measuring device is attached to the connecting pipes 425 and 426. However, the heat exchanger unit 42W according to the present embodiment is not limited to this configuration. For example, various measuring devices other than the temperature measuring device may be attached.

(5-3-4) Modification 3D
In the above description, the first heat exchanger 52W and the second heat exchanger 62W have a substantially rectangular shape in plan view, but the heat exchanger unit 42W according to the present embodiment is limited to this configuration. is not. For example, the heat exchanger unit 42W may have a flat plate shape or a curved plate shape.

(5-3-5) Modification 3E
In the above description, the ceiling-embedded heat exchanger unit 42W has been described, but the heat exchanger unit according to the present embodiment is not limited to this. The heat exchanger unit 42 according to the present embodiment can be mounted not only on a ceiling-embedded indoor unit but also on a duct-type or ceiling-suspended indoor unit, for example. Further, the configuration of the heat exchanger unit 42 </ b> W according to the present embodiment may be applied to the outdoor heat exchanger 23 of the outdoor unit 2.

<Other embodiments>
As mentioned above, although embodiment of this invention and its modification were demonstrated based on drawing, specific structure is not restricted to these embodiment and its modification, It changes in the range which does not deviate from the summary of invention. Is possible.

5a Liquid side connection pipe (liquid refrigerant pipe)
6a Gas side connection pipe (gas refrigerant pipe)
41 Indoor fans (fans)
42 heat exchanger unit 42S heat exchanger unit 52 first heat exchanger 52S first heat exchanger 62 second heat exchanger 62S second heat exchanger 500 first flat tube group 500L lower first heat exchange region 500U upper First heat exchange region 523 First header 523L Lower first header 523U Upper first header 524 Second header 524L Lower second header 524U Upper second header 525 Connecting pipe (second folded portion, second connecting pipe)
625 Connecting pipe (folded part, connecting pipe)
600 Second flat tube group 600L Lower second heat exchange area 600U Upper second heat exchange area 623 Third header 623L Lower third header 623U Upper third header 624 Fourth header 624L Lower fourth header 624U Upper fourth Header D1 First direction D2 Second direction

JP, 2006-38192, A

Claims (13)

A first flat tube group (500) comprising a plurality of flat multi-hole tubes connected to the first header (523) and the second header (524), and the first header and the second header. A first heat exchanger (52, 52S);
The third header (623) and the fourth header (624), which are arranged side by side with the first heat exchanger, and arranged on the leeward side of the air flow by the fan (41) than the first heat exchanger, A second heat exchanger (62, 62S) having a second flat tube group (600) composed of a plurality of flat multi-hole tubes connected to each of the third header and the fourth header,
The fourth header has a folded portion (625) that folds the refrigerant flowing in from the third header side to the third header side.
Heat exchanger unit (42, 42S). In the second flat tube group, a plurality of flat multi-hole tubes are lined up and down, and the upper one or more flat multi-hole tubes form the upper second heat exchange region (600U), and the lower one or more flat multi-hole tubes The flat multi-hole tube forms the lower second heat exchange region (600 L),
The fourth header has an upper fourth header (624U) and a lower fourth header (624L) connected to each of the upper second heat exchange region and the lower second heat exchange region,
The folded portion connects the upper fourth header and the lower fourth header, and folds the refrigerant flowing in from the third header side to the third header side;
The heat exchanger unit according to claim 1. The folded portion includes a connecting pipe (625) that connects the upper fourth header and the lower fourth header.
The heat exchanger unit according to claim 2. A temperature measuring device for measuring the temperature of the refrigerant is attached to the folded portion.
The heat exchanger unit according to any one of claims 1 to 3. The first direction (D1) of the refrigerant flow from the first header to the second header and the second direction (D2) of the refrigerant flow from the third header to the fourth header are opposed to each other.
The third header has an upper third header (623U) and a lower third header (623L) connected to each of the upper second heat exchange region and the lower second heat exchange region,
An area of the upper second heat exchange region is larger than an area of the lower second heat exchange region;
A gas refrigerant pipe (6a) through which a gaseous refrigerant flows is connected to the first header and the upper third header,
A liquid refrigerant pipe (5a) through which a liquid refrigerant flows is connected to the second header and the lower third header,
The heat exchanger unit according to any one of claims 2 to 4. The second header has a second folded portion (525) that folds the refrigerant flowing in from the first header side to the first header side.
The heat exchanger unit (42S) according to any one of claims 1 to 4. In the first flat tube group, a plurality of flat multi-hole tubes are lined up and down, and the upper one or more flat multi-hole tubes form the upper first heat exchange region (500 U), and the lower one or more flat multi-hole tubes The flat multi-hole tube forms the lower first heat exchange region (500 L),
The second header has an upper second header (524U) and a lower second header (524L) connected to each of the upper first heat exchange region and the lower first heat exchange region,
The second folded portion connects the upper second header and the lower second header, and folds the refrigerant flowing in from the first header side to the first header side;
The heat exchanger unit according to claim 6. The first direction of the refrigerant flow from the first header toward the second header is opposed to the second direction of the refrigerant flow from the third header to the fourth header,
The first header has an upper first header (523U) and a lower first header (523L) connected to the upper first heat exchange region and the lower first heat exchange region, respectively.
The third header has an upper third header and a lower third header connected to each of the upper second heat exchange region and the lower second heat exchange region,
The areas of the upper first heat exchange region and the upper second heat exchange region are larger than the areas of the lower first heat exchange region and the lower second heat exchange region, respectively.
A gas refrigerant pipe through which a gaseous refrigerant flows is connected to the upper first header and the upper third header,
A liquid refrigerant pipe through which liquid refrigerant flows is connected to the lower first header and the lower third header,
The heat exchanger unit according to claim 7. The second folded portion includes a second connection pipe (525) that connects the upper second header and the lower second header.
The heat exchanger unit according to claim 7 or 8. A temperature measuring device for measuring the temperature of the refrigerant is attached to the second folded portion.
The heat exchanger unit according to claim 9. The first heat exchanger and the second heat exchanger are folded between the headers;
The heat exchanger unit according to any one of claims 1 to 10. The first heat exchanger and the second heat exchanger are bent at at least three locations between the headers, and have a substantially rectangular shape in plan view.
The heat exchanger unit according to claim 11. The first heat exchanger and the second heat exchanger are shaped to surround the fan.
The heat exchanger unit according to claim 11.

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