JP7092987B2 - Indoor heat exchanger and air conditioner - Google Patents

Description

The present disclosure relates to indoor heat exchangers and air conditioners.

Conventionally, as an outdoor heat exchanger included in an outdoor unit of an air conditioner, for example, as described in Patent Document 1 (Japanese Patent Laid-Open No. 2016-041986), heat transfer fins are joined to a plurality of flat tubes. There is something that has been done.

When such a heat exchanger configured by joining heat transfer fins to a plurality of flat tubes is used in an indoor unit of an air conditioner, dew condensation water generated when the heat exchanger functions as an evaporator of a refrigerant. Scattering into the indoor space becomes a problem.

The present disclosure has been made in view of the above-mentioned points, and an object of the present disclosure is to provide an indoor heat exchanger and an air conditioner having a plurality of flat tubes capable of suppressing the scattering of dew condensation water. There is something in it.

The indoor heat exchanger according to the first aspect is an indoor heat exchanger used in an indoor unit of an air conditioner. The indoor heat exchanger is equipped with a plurality of flat tubes and a plurality of heat transfer fins. The flat tube has a flow path inside which the refrigerant passes. Multiple flat tubes are lined up and down. A plurality of heat transfer fins are joined to a plurality of flat tubes. The heat transfer fin has a communication portion. The communication part extends up and down. The communication portion of the heat transfer fin is a part of the heat transfer fin and is connected to each part located between the flat tubes arranged one above the other. The indoor heat exchanger satisfies the relationship of 4.0 ≦ DP / HT ≦ 10.0. Here, HT is the height of the flat tube. DP is the pitch of flat tubes arranged one above the other.

In this indoor heat exchanger, even when the flow velocity of the air flow supplied to the indoor heat exchanger is increased, it is possible to suppress the scattering of condensed water that occurs when it is used as an evaporator of a refrigerant. It will be possible.

The indoor heat exchanger according to the second aspect is an indoor heat exchanger used for an indoor unit. The indoor unit constitutes an air conditioner together with an outdoor unit having an outdoor heat exchanger. The outdoor heat exchanger is equipped with a plurality of flat tubes and a plurality of heat transfer fins. The indoor heat exchanger also has a plurality of flat tubes and a plurality of heat transfer fins. These flat tubes have a flow path inside which the refrigerant passes. Multiple flat tubes are lined up and down. The plurality of fins are joined to a plurality of flat tubes. The heat transfer fin has a communication portion, the communication portion extending vertically. The communication portion of the heat transfer fin is a part of the heat transfer fin and is connected to each part located between the flat tubes arranged one above the other. The value of DP / HT of the indoor heat exchanger is smaller than the value of DP / HT of the outdoor heat exchanger. Here, HT is the height of the flat tube. DP is the pitch of flat tubes arranged one above the other.

In this indoor heat exchanger, while suppressing frost formation when the outdoor heat exchanger is used as the refrigerant evaporator, the scattering of condensed water that occurs when the indoor heat exchanger is used as the refrigerant evaporator is suppressed. It becomes possible to suppress it.

The indoor heat exchanger according to the third aspect is the indoor heat exchanger according to the first aspect or the second aspect, and the flat tube is a plurality of upstream flat tubes arranged on the upstream side in the air flow direction. It has a plurality of downstream flat tubes arranged on the downstream side in the air flow direction with respect to the upstream flat tube.

In this indoor heat exchanger, it becomes possible to suppress the scattering of dew condensation water from the downstream end portion in the air flow direction of the downstream flat tube.

The indoor heat exchanger according to the fourth aspect is the indoor heat exchanger according to any one of the first to third viewpoints, and the communication portion is located on the leeward side of the flat tube in the air flow direction.

In this indoor heat exchanger, the dew condensation water generated in the flat tube is guided downward while being transmitted to the communication portion of the heat transfer fins located on the downstream side in the air flow direction, so that the air flow direction of the heat transfer fins. It is possible to suppress the scattering of condensed water from the downstream end of the.

The indoor heat exchanger according to the fifth aspect is the indoor heat exchanger according to any one of the first aspect to the fourth aspect, and satisfies the relationship of 0.2 ≦ WL / WF ≦ 0.5. Here, WF is the length of the heat transfer fin in the air flow direction. WL is the length of the communication portion in the air flow direction.

In this indoor heat exchanger, the scattering of dew condensation water can be suppressed by sufficiently securing the communication portion while suppressing the material cost of the heat transfer fins.

The indoor heat exchanger according to the sixth aspect is the indoor heat exchanger according to any one of the first to fifth aspects, and the heat transfer fin has a cut-up portion. The longitudinal direction of the cut-up portion is the vertical direction.

In this indoor heat exchanger, since the heat transfer fin has a cut-up portion, it is possible to improve the heat transfer performance.

The indoor heat exchanger according to the seventh aspect is the indoor heat exchanger according to any one of the first to sixth aspects, and satisfies the relationship of 4.6 ≦ DP / HT ≦ 8.0.

In this indoor heat exchanger, it is easier to suppress the scattering of condensed water that occurs when it is used as an evaporator of a refrigerant.

The air conditioner according to the eighth aspect includes an indoor unit having an indoor heat exchanger according to any one of the first to seventh aspects and an outdoor unit having an outdoor heat exchanger.

In this air conditioner, it is easy to suppress the scattering of condensed water that occurs when the indoor heat exchanger is used as an evaporator of the refrigerant.

It is a schematic block diagram of an air conditioner. It is a schematic external perspective view of an outdoor unit. It is a plan view schematic block diagram of an outdoor unit. It is a schematic external perspective view of an outdoor heat exchanger. It is explanatory drawing which shows the positional relationship between the outdoor fin and the outdoor flat tube. It is a schematic external perspective view of an indoor unit. It is a schematic block diagram in a plan view of an indoor unit. It is a side view schematic block diagram in the AA cross section of FIG. 7 of an indoor unit. It is a schematic external perspective view of an indoor heat exchanger. It is a partially enlarged schematic external perspective view of the indoor heat exchanger. It is explanatory drawing which shows the positional relationship between a room fin and a room flat tube. It is explanatory drawing which shows the joint-like body of the room fin and the room flat tube. It is explanatory drawing which shows the positional relationship between the room fin and the room flat tube which concerns on modification A. It is explanatory drawing of the downstream side vicinity part in the air flow direction in the BB cross section in FIG. 13 of the water guide rib which the indoor fin which concerns on modification A has.

(1) Configuration of Air Conditioning Device FIG. 1 shows a schematic configuration diagram of the air conditioning device 1.

The air conditioner 1 is a device capable of cooling and heating a room such as a building by performing a steam compression type refrigeration cycle.

The air conditioner 1 mainly has an outdoor unit 2, an indoor unit 3, a liquid refrigerant connecting pipe 4 and a gas refrigerant connecting pipe 5, which are refrigerant paths connecting the outdoor unit 2 and the indoor unit 3. There is. The steam compression type refrigerant circuit 6 of the air conditioner 1 is configured by connecting the outdoor unit 2 and the indoor unit 3 via the refrigerant connecting pipes 4 and 5. The refrigerant connecting pipes 4 and 5 are refrigerant pipes to be installed on site when the air conditioner 1 is installed at an installation location such as a building. Although not particularly limited, in the present embodiment, the refrigerant circuit 6 is filled with R32 as an operating refrigerant.

(2) Outdoor unit (2-1) Schematic configuration of the outdoor unit The outdoor unit 2 is installed outdoors (on the roof of a building, near the wall surface of a building, etc.) and constitutes a part of the refrigerant circuit 6. The outdoor unit 2 mainly includes an accumulator 7, a compressor 8, a four-way switching valve 10, an outdoor heat exchanger 11, an outdoor expansion valve 12 as an expansion mechanism, a liquid side closing valve 13, and a gas side closing valve. It has 14, an outdoor fan 15, and a casing 40.

The accumulator 7 is a container for supplying the gas refrigerant to the compressor, and is provided on the suction side of the compressor 8.

The compressor 8 sucks in the low-pressure gas refrigerant, compresses it, and discharges the high-pressure gas refrigerant.

The outdoor heat exchanger 11 is a heat exchanger that functions as a radiator of the refrigerant discharged from the compressor 8 during the cooling operation and as an evaporator of the refrigerant sent from the indoor heat exchanger 51 during the heating operation. .. The liquid side of the outdoor heat exchanger 11 is connected to the outdoor expansion valve 12, and the gas side is connected to the four-way switching valve 10.

The outdoor expansion valve 12 decompresses the refrigerant dissipated in the outdoor heat exchanger 11 before sending it to the indoor heat exchanger 51 during the cooling operation, and decompresses the refrigerant dissipated in the indoor heat exchanger 51 during the heating operation in the outdoor heat exchanger 51. It is an electric expansion valve capable of reducing the pressure before sending to 11.

One end of the liquid refrigerant connecting pipe 4 is connected to the liquid side closing valve 13 of the outdoor unit 2. One end of the gas refrigerant connecting pipe 5 is connected to the gas side closing valve 14 of the outdoor unit 2.

Each device and the valve of the outdoor unit 2 are connected by a refrigerant pipe 16 to 22.

The four-way switching valve 10 has a state in which the discharge side of the compressor 8 is connected to the outdoor heat exchanger 11 side and the suction side of the compressor 8 is connected to the gas side closing valve 14 side (four-way switching valve 10 in FIG. 1). (See the solid line) and the state where the discharge side of the compressor 8 is connected to the gas side closing valve 14 side and the suction side of the compressor 8 is connected to the outdoor heat exchanger 11 side (four-way switching valve 10 in FIG. 1). By switching between (see the broken line in) and, the connection state of the cooling operation and the connection state of the heating operation, which will be described later, are switched.

The outdoor fan 15 is arranged inside the outdoor unit 2, sucks in the outdoor air, supplies the outdoor air to the outdoor heat exchanger 11, and then discharges the outdoor air to the outside of the unit (indicated by an arrow in FIG. 3). To form. As described above, the outdoor air supplied by the outdoor fan 15 is used as a cooling source or a heating source in heat exchange with the refrigerant of the outdoor heat exchanger 11.

The casing 40 mainly includes a bottom frame 40a, a top plate 40b, and a left front plate 40c, as shown in a schematic external perspective view of the outdoor unit 2 of FIG. 2 and a schematic plan view of the outdoor unit 2 of FIG. It has a right front plate 40d and a right front plate 40e. The bottom frame 40a is a horizontally long substantially rectangular plate-shaped member constituting the bottom surface portion of the casing 40, and is installed on the site installation surface by the fixing legs 41 fixed to the lower surface. The top plate 40b is a horizontally long substantially rectangular plate-shaped member constituting the top surface portion of the casing 40. The left front plate 40c is a plate-shaped member mainly constituting the left front portion and the left surface portion of the casing 40, and the air taken into the casing 40 from the back side and the left surface side by the outdoor fan 15 is blown out to the front side. Two outlets for the casing are formed side by side on the upper and lower sides. Each outlet is provided with a fan grill 42. The right front plate 40d is a plate-shaped member mainly constituting the right front portion and the front portion of the right side surface of the casing 40. The right side plate 40e is a plate-shaped member mainly constituting the rear portion and the right back surface portion of the right side surface of the casing 40.

In the casing 40, a partition plate 43 for partitioning the blower room in which the outdoor fan 15 and the like are arranged and the machine room in which the compressor 8 and the like are arranged is provided.

(2-2) Schematic Structure of Outdoor Heat Exchanger FIG. 4 shows a schematic external perspective view of the outdoor heat exchanger 11.

The outdoor heat exchanger 11 mainly includes a gas side shunt 23, a liquid side shunt 24, a plurality of inflow side folding members 25, a plurality of anti-inflow side folding members 26, and a plurality of outdoor flat pipes 90. It has a plurality of outdoor fins 91. Here, all of these constituting the outdoor heat exchanger 11 are made of aluminum or an aluminum alloy, and are joined to each other by brazing or the like.

The plurality of outdoor flat tubes 90 are arranged side by side in the vertical direction.

The plurality of outdoor fins 91 are arranged in the plate thickness direction along the outdoor flat pipe 90, and are fixed to the plurality of outdoor flat pipes 90.

The gas side shunt 23 is connected to a refrigerant pipe 19 and a plurality of outdoor flat pipes 90 arranged above. When the outdoor heat exchanger 11 functions as a radiator for the refrigerant, the refrigerant flowing from the refrigerant pipe 19 into the outdoor heat exchanger 11 is divided into a plurality of height positions, and among the plurality of outdoor flat pipes 90. Send to what is located above.

The liquid side shunt 24 is connected to a refrigerant pipe 20 and a plurality of outdoor flat pipes 90 arranged below. When the outdoor heat exchanger 11 functions as a radiator for the refrigerant, the refrigerant flowing from the one arranged below the plurality of outdoor flat pipes 90 is merged, and the outdoor heat exchange is performed through the refrigerant pipe 20. Let it flow out of the vessel 11.

The plurality of inflow side folding members 25 are arranged between the gas side shunt 23 and the liquid side shunt 24, and connect the ends of the outdoor flat pipes 90 provided at different height positions from each other.

The end of the anti-inflow side folding member 26 and the outdoor heat exchanger 11 opposite to the end on the side where the gas side shunt 23, the liquid side shunt 24, and the plurality of inflow side folding members 25 are provided. The ends of the outdoor flat tubes 90 provided in the portions and provided at different height positions are connected to each other.

As described above, since the outdoor heat exchanger 11 is provided with a plurality of inflow side folding members 25 and anti-inflow side folding members 26, it is possible to flow the refrigerant while folding the refrigerant at both ends of the outdoor heat exchanger 11. It is possible.

(2-3) Outdoor flat pipe In FIG. 5, the outdoor fin 91 and the outdoor are viewed from the direction in which the flow path 90c extends in a state of being cut in a cross section perpendicular to the direction in which the flow path 90c inside the outdoor flat pipe 90 extends. The positional relationship with the flat tube 90 is shown.

The outdoor flat pipe 90 has an upper flat surface 90a facing vertically upward and forming an upper surface, a lower flat surface 90b facing vertically downward and forming a lower surface, and a large number of small flow paths 90c through which a refrigerant flows. Have. The plurality of flow paths 90c included in the outdoor flat tube 90 are provided side by side in the air flow direction (indicated by an arrow in FIG. 5; the longitudinal direction of the outdoor flat tube 90 in the cross-sectional view of the flow path of the flow path 90c). As the plurality of outdoor flat tubes 90, the same one is used with the same height HT in the vertical direction. Here, the height HT refers to the width of the upper flat surface 90a and the lower flat surface 90b of the outdoor flat tube 90 in the height direction. These plurality of outdoor flat tubes 90 are arranged in the vertical direction at a predetermined pitch (step pitch DP). Here, the step pitch DP is the distance between the upper flat plane 90a of the outdoor flat pipe 90.

In the outdoor heat exchanger 11 of the present embodiment, the downstream end of the plurality of outdoor flat pipes 90 in the air flow direction is located further downstream than the downstream end of the outdoor fin 91 in the air flow direction. It is configured in. As a result, damage or breakage of the leeward end of the outdoor fin 91 during manufacturing or transportation of the outdoor heat exchanger 11 is suppressed.

(2-4) Outdoor Fins The outdoor fins 91 are plate-shaped members that spread in the air flow direction and the vertical direction, are arranged at predetermined intervals in the plate thickness direction, and are fixed to the outdoor flat pipe 90.

The outdoor fin 91 includes a plurality of insertion portions 92, an outdoor communication portion 97a, a plurality of leeward lower parts 97b, a waffle portion 93, a leeward fin tab 94a, a leeward fin tab 94b, an outdoor slit 95, a leeward rib 96a, a leeward rib 96b, and the like. have. The thickness of the outdoor fin 91 in the flat portion in the plate thickness direction is, for example, 0.05 mm or more and 0.15 mm or less.

The insertion portion 92 is formed so as to be cut horizontally from the leeward edge portion of the outdoor fin 91 to the front of the leeward side edge portion toward the leeward side. The plurality of insertion portions 92 are provided so as to be arranged in the vertical direction. The insertion portion 92 constitutes a fin collar formed by burring or the like. The shape of the insertion portion 92 substantially matches the outer shape of the cross section of the outdoor flat tube 90, and the outdoor flat tube 90 is brazed and fixed to the insertion portion 92 with the outdoor flat tube 90 inserted.

The outdoor communication portion 97a is a portion of the outdoor fin 91 that is continuous in the vertical direction on the windward side of the outdoor flat pipe 90 on the windward side. From the viewpoint of ensuring the frost bearing capacity, the distance in the air flow direction from the upper end of the wind of the outdoor flat pipe 90 to the upper end of the wind in the outdoor communication portion 97a of the outdoor fin 91 is preferably 4 mm or more.

The plurality of wind lower parts 97b extend from different height positions in the outdoor communication portion 97a toward the downstream side in the air flow direction. Each wind lower part 97b is surrounded in the vertical direction by adjacent insertion portions 92.

The waffle portion 93 is formed in the vicinity of the center of the outdoor fin 91 in the air flow direction, and includes a raised portion and a non-raised portion in the plate thickness direction.

The leeward fin tab 94a and the leeward fin tab 94b are provided near the leeward end and near the leeward end, respectively, in order to regulate the distance between the outdoor fins 91.

The outdoor slit 95 is a portion formed by being cut up from a flat portion in the plate thickness direction in order to improve the heat transfer performance of the outdoor fin 91, and is formed on the downstream side of the waffle portion 93 in the air flow direction. The outdoor slit 95 is formed so that its longitudinal direction is in the vertical direction (arrangement direction of the outdoor flat tubes 90), and a plurality of (two in the present embodiment) are arranged in the air flow direction. .. These outdoor slits 95 have openings on the upstream side and the downstream side in the air flow direction by being cut up from the flat portion to the same side in the plate thickness direction.

The windward rib 96a is formed so as to extend in the air flow direction between the outdoor flat pipes 90 vertically adjacent to each other above and below the windward fin tab 94a. The leeward rib 96b is provided so as to continuously extend from the leeward end of the leeward rib 96a to the leeward side.

(3) Indoor unit (3-1) Schematic configuration of the indoor unit FIG. 6 shows an external perspective view of the indoor unit 3. FIG. 7 shows a schematic plan view showing a state in which the top plate of the indoor unit 3 is removed. FIG. 8 shows a schematic side sectional view of the indoor unit 3 in the cut surface shown by AA in FIG. 7.

In the present embodiment, the indoor unit 3 is a type of indoor unit installed by being embedded in a ceiling opening in a ceiling such as a room which is an air-conditioned space, and constitutes a part of a refrigerant circuit 6. The indoor unit 3 mainly has an indoor heat exchanger 51, an indoor fan 52, a casing 30, a flap 39, a bell mouth 33, and a drain pan 32.

The indoor heat exchanger 51 is a heat exchanger that functions as an evaporator of the refrigerant sent from the indoor heat exchanger 51 during the cooling operation and as a radiator of the refrigerant discharged from the compressor 8 during the heating operation. .. The liquid side of the indoor heat exchanger 51 is connected to the indoor end of the liquid refrigerant connecting pipe 4, and the gas side is connected to the indoor end of the gas refrigerant connecting pipe 5.

The indoor fan 52 is a centrifugal blower arranged inside the casing main body 31 of the indoor unit 3. The indoor fan 52 sucks indoor air into the casing 30 through the suction port 36 of the decorative panel 35, passes through the indoor heat exchanger 51, and then blows out the air to the outside of the casing 30 through the outlet 37 of the decorative panel 35. (Indicated by an arrow in FIG. 8) is formed. In this way, the temperature of the indoor air supplied by the indoor fan 52 is adjusted by exchanging heat with the refrigerant of the indoor heat exchanger 51.

The casing 30 mainly includes a casing main body 31 and a decorative panel 35.

The casing main body 31 is arranged so as to be inserted into an opening formed in the ceiling U of the air-conditioning chamber, and in a plan view thereof, a substantially octagonal box in which long sides and short sides are alternately formed. It is a shaped body with an open lower surface. The casing main body 31 has a top plate and a plurality of side plates extending downward from the peripheral edge of the top plate.

The decorative panel 35 is arranged so as to be fitted into the opening of the ceiling U, extends outward in a plan view from the top plate and side plates of the casing main body 31, and is attached below the casing main body 31 from the indoor side. .. The decorative panel 35 has an inner frame 35a and an outer frame 35b. Inside the inner frame 35a, a substantially square suction port 36 that opens downward is formed. Above the suction port 36, a filter 34 for removing dust in the air sucked from the suction port 36 is provided. On the inside of the outer frame 35b and on the outside of the inner frame 35a, an air outlet 37 and a corner air outlet 38 that open diagonally downward from below are formed. The outlet 37 has a first outlet 37a, a second outlet 37b, a third outlet 37c, and a fourth outlet 37d at positions corresponding to each side of a substantially square shape in a plan view of the decorative panel 35. And have. The corner outlet 38 has a first corner outlet 38a, a second corner outlet 38b, and a third corner outlet 38 at positions corresponding to substantially square squares in the plan view of the decorative panel 35. It has 38c and a fourth corner outlet 38d.

The flap 39 is a member capable of changing the direction of the air flow passing through the outlet 37. The flap 39 includes a first flap 39a arranged at the first outlet 37a, a second flap 39b arranged at the second outlet 37b, a third flap 39c arranged at the third outlet 37c, and a first flap 39. It has a fourth flap 39d arranged at the four outlets 37d. Each flap 39a to d is rotatably supported at a predetermined position of the casing 30.

The drain pan 32 is arranged below the indoor heat exchanger 51, and receives the drain water generated by the condensation of the moisture in the air in the indoor heat exchanger 51. The drain pan 32 is attached to the lower part of the casing main body 31. In the drain pan 32, a cylindrical space extending in the vertical direction is formed inside the indoor heat exchanger 51 in a plan view, and the bell mouth 33 is arranged below the inside of the space. The bell mouth 33 guides the air sucked from the suction port 36 to the indoor fan 52. Further, in a plan view, the drain pan 32 is formed with a plurality of blowout channels 47a to d extending in the vertical direction and corner blowout channels 48a to c extending in the vertical direction on the outside of the indoor heat exchanger 51. The outlet flow paths 47a to d are a first outlet flow path 47a communicating with the first outlet 37a at the lower end, a second outlet flow path 47b communicating with the second outlet 37b at the lower end, and a third outlet at the lower end. It has a third outlet flow path 47c communicating with 37c and a fourth outlet flow path 47d communicating with the fourth outlet 37d at the lower end. The corner outlets 48a to c are the first corner outlet 48a communicating with the first corner outlet 38a at the lower end and the second corner outlet 38b communicating with the second corner outlet 38b at the lower end. It has a path 48b and a third corner outlet flow path 48c that communicates with the third corner outlet 38c at the lower end.

(3-2) Schematic Structure of Indoor Heat Exchanger FIG. 9 shows a schematic external perspective view of the indoor heat exchanger 51. FIG. 10 shows a partially enlarged external perspective view of the windward side of the plurality of indoor fins 60 of the indoor heat exchanger 51.

The indoor heat exchanger 51 is arranged inside the casing main body 31 at the same height as the indoor fan 52 in a bent state so as to surround the periphery thereof. The indoor heat exchanger 51 mainly has a liquid side header 81, a gas side header 71, a folded header 59, a plurality of indoor flat tubes 55, and a plurality of indoor fins 60. Here, all of these constituting the indoor heat exchanger 51 are made of aluminum or an aluminum alloy, and are joined to each other by brazing or the like.

The indoor heat exchanger 51 includes an upwind heat exchange unit 70 (inner portion in a plan view) constituting the leeward side in the air flow direction and a leeward heat exchange unit 80 (plan view) constituting the leeward side in the air flow direction. The outer part of) and.

The liquid side header 81 constitutes one end of the indoor heat exchanger 51 in the plan view of the leeward heat exchange section 80, and is a cylindrical member extending in the vertical direction. The end of the liquid refrigerant connecting pipe 4 on the indoor side is connected to the liquid side header 81. Further, a plurality of indoor flat tubes 55 constituting the leeward heat exchange section 80 of the indoor heat exchanger 51 are connected to the liquid side header 81 side by side.

The gas side header 71 constitutes one end of the indoor heat exchanger 51 in the plan view of the upwind heat exchange section 70, and is a cylindrical member extending in the vertical direction. An indoor end of the gas-refrigerant connecting pipe 5 is connected to the gas-side header 71. Further, a plurality of indoor flat pipes 55 constituting the upwind heat exchange unit 70 of the indoor heat exchanger 51 are connected to the gas side header 71 side by side.

The folded header 59 constitutes an end portion of the indoor heat exchanger 51 opposite to the liquid side header 81 and the gas side header 71 in a plan view, and has a plurality of folded spaces arranged in the vertical direction inside. is doing. In each folded space, the indoor flat tube 55 constituting the upwind heat exchange section 70 and the indoor flat tube 55 constituting the leeward heat exchange section 80 are connected to each other. ing. As a result, in the folded header 59, the refrigerant flowing through the indoor flat pipe 55 at each height position is blown at the same height position while suppressing the mixing of the refrigerants flowing through the indoor flat pipe 55 at different height positions. It can be folded back and sent to the indoor flat tube 55 on the upper side (when the indoor heat exchanger 51 functions as a refrigerant evaporator) or on the leeward side (when the indoor heat exchanger 51 functions as a refrigerant radiator). ing.

The plurality of indoor flat tubes 55 are provided with one constituting the upwind heat exchange section 70 and one constituting the leeward heat exchange section 80. That is, the plurality of indoor flat tubes 55 are arranged side by side in the upwind heat exchange section 70 of the indoor heat exchanger 51, and the downwind heat exchange section 80 of the indoor heat exchanger 51. Including those arranged side by side in the vertical direction. One end of each of the plurality of indoor flat pipes 55 constituting the upwind heat exchange unit 70 is connected to the gas side header 71, and the other end is connected to the windward side portion of the folded header 59. One end of each of the plurality of indoor flat tubes 55 constituting the leeward heat exchange section 80 is connected to the liquid side header 81, and the other end is connected to the leeward side portion of the folded header 59.

Similarly, the plurality of indoor fins 60 are provided with one constituting the upwind heat exchange unit 70 and one constituting the leeward heat exchange unit 80. That is, the plurality of indoor fins 60 are fixed to the indoor flat pipe 55 constituting the upwind heat exchange section 70 of the indoor heat exchanger 51, and the leeward of the indoor heat exchanger 51. It includes one fixed to the indoor flat tube 55 constituting the heat exchange unit 80. Each of the indoor fins 60 is arranged along the indoor flat pipe 55 in the plate thickness direction of the indoor fins 60.

(3-3) Indoor flat pipe In FIG. 11, the indoor fin 60 and the room viewed from the direction in which the flow path 55c extends are cut in a cross section perpendicular to the direction in which the flow path 55c inside the indoor flat pipe 55 extends. The positional relationship with the flat tube 55 is shown.

The indoor flat pipe 55 has an upper flat surface 55a facing vertically upward and forming an upper surface, a lower flat surface 55b facing vertically downward and forming a lower surface, and a large number of small flow paths 55c through which a refrigerant flows. Have. The plurality of flow paths 55c included in the indoor flat tube 55 are provided side by side in the air flow direction (indicated by an arrow in FIG. 11; the longitudinal direction of the indoor flat tube 55 in the cross-sectional view of the flow path of the flow path 55c). As the plurality of indoor flat tubes 55, the same one is used with the same height HT in the vertical direction. Here, the height HT refers to the width of the upper flat surface 55a and the lower flat surface 55b of the indoor flat tube 55 in the height direction, and is preferably 1.2 mm or more and 2.5 mm or less. These plurality of indoor flat pipes 55 are similarly arranged in the upwind heat exchange unit 70 and the leeward heat exchange unit 80 at a predetermined pitch (step pitch DP) in the vertical direction. Here, the step pitch DP is an interval of the upper flat surface 55a of the indoor flat tube 55, and is preferably 8.0 mm or more and 15.0 mm or less. Here, the indoor heat exchanger 51 satisfies the relationship of 4.0 ≦ DP / HT ≦ 10.0. The lower limit of DP / HT of the indoor heat exchanger 51 is preferably 4.6 or more, and the upper limit of DP / HT of the indoor heat exchanger 51 is preferably 8.0 or less. It is preferable that the indoor heat exchanger 51 satisfies the relationship of 4.6 ≦ DP / HT ≦ 8.0.

Further, in the air conditioner 1 of the present embodiment, the DP / HT value of the indoor heat exchanger 51 satisfies the relationship smaller than the DP / HT value of the outdoor heat exchanger 11 described above.

In the present embodiment, the indoor flat pipe 55 constituting the upwind heat exchange unit 70 and the indoor flat pipe 55 constituting the leeward heat exchange unit 80 overlap each other at each height position in the air flow direction view. It is arranged like this.

Further, in the indoor heat exchanger 51 of the present embodiment, the upstream end portion of the plurality of indoor flat pipes 55 in the air flow direction and the upstream end portion of the indoor fin 60 in the air flow direction are substantially the same in the air flow direction. It is provided at the position.

(3-4) Indoor Fins The indoor fins 60 are plate-shaped members that spread in the air flow direction and the vertical direction, and a plurality of indoor fins are arranged at predetermined intervals in the plate thickness direction and are fixed to the indoor flat pipe 55. In the present embodiment, the indoor fins 60 constituting the upwind heat exchange unit 70 and the indoor fins 60 constituting the leeward heat exchange unit 80 are arranged so as to substantially overlap each other in the air flow direction view. There is. Further, the leeward end of the indoor fin 60 constituting the leeward heat exchange unit 70 and the leeward end of the indoor fin 60 constituting the leeward heat exchange unit 80 are arranged so as to be in contact with each other at least in a part. There is.

The indoor fins 60, both those constituting the upwind heat exchange section 70 and those constituting the leeward heat exchange section 80, have a main surface 61, a plurality of fin collar sections 65a, an indoor communication section 64, and a plurality of windward upper portions 65. , Main slit 62, communication position slit 63, and the like. The thickness of the indoor fin 60 on the flat main surface 61 in the plate thickness direction is, for example, 0.05 mm or more and 0.15 mm or less. Further, the pitch of the plurality of indoor fins 60 in the plate thickness direction (distance between the surfaces on the same side of the indoor fins 60 adjacent to each other) is preferably 1.0 mm or more and 1.6 mm or less.

The main surface 61 constitutes a flat portion of the indoor fins 60, which is not provided with the fin collar portion 65a, the main slit 62, or the communication position slit 63.

The fin collar portion 65a is formed so as to extend horizontally from the leeward edge portion of the indoor fin 60 toward the leeward side to the front of the leeward side edge portion. The plurality of fin collar portions 65a are provided so as to be arranged in the vertical direction. The fin collar portion 65a is formed by burring or the like. The contour shape of the fin collar portion 65a substantially matches the outer shape of the cross section of the indoor flat tube 55, and the indoor flat tube 55 is brazed and fixed to the fin collar portion 65a with the indoor flat tube 55 inserted. .. Here, FIG. 12 shows a joint state between the indoor fin 60 and the indoor flat pipe 55 in a cross section obtained by cutting the flow path 55c of the indoor flat pipe 55 along a plane including a vertical direction along the refrigerant passage direction. As shown in FIG. 12, the fin collar portion 65a is configured to be raised from the main surface 61 in the plate thickness direction of the main surface 61 on the side opposite to the cut-up side of the main slit 62. Further, on the side of the fin collar portion 65a opposite to the main surface 61 side, a positioning portion 65x bent so as to extend away from the upper flat surface 55a (or the lower flat surface 55b) of the corresponding indoor flat tube 55 is provided. It is provided. The positioning portion 65x defines the distance between the indoor fins 60 in the plate thickness direction by making surface contact with the main surface 61 of the adjacent indoor fins 60. As shown in FIG. 12, such a fin collar portion 65a is joined by brazing with a brazing material 58 interposed between the upper flat surface 55a (or the lower flat surface 55b) of the indoor flat tube 55. There is. Although not particularly limited, as shown in FIG. 12, on the lower flat surface 55b side of the indoor flat tube 55, a portion where the fin collar portion 65a starts to rise with respect to the main surface 61 and a cut-up of the main slit 62 are raised. The distance DS between the place where is started and the place where is started is preferably 1 mm or less. Since the dew condensation water on the lower flat surface 55b of the indoor flat tube 55 is guided downward through the portion where the cutting of the main slit 62 has started and is drained, the distance DS is set to a short distance of 1 mm or less. As a result, it is possible to prevent the dew condensation water from being continuously retained in the lower flat surface 55b of the indoor flat tube 55.

The indoor communication portion 64 is a portion of the indoor fins 60 that is continuous in the vertical direction on the leeward side of the indoor flat pipe 55 on the leeward side. The relationship between the width WL in the air flow direction of the indoor communication portion 64 of the indoor fins 60 and the width WF in the air flow direction of the indoor fins 60 is 0.2 ≦ WL / WF ≦ 0.5. It is preferable to satisfy.

The plurality of wind upper portions 65 extend from different height positions in the indoor communication portion 64 toward the upstream side in the air flow direction. Each wind upper portion 65 is surrounded in the vertical direction by adjacent fin collar portions 65a. The vertical length of each wind upper 65 is defined by DP-HT.

The main slit 62 is a portion formed by cutting up from a flat main surface 61 in the plate thickness direction in order to improve the heat transfer performance of the indoor fins 60, and is formed on each wind upper portion 65 of the indoor fins 60. Has been done. The main slits 62 are formed so that a plurality (four in the present embodiment) are lined up in the air flow direction.

The communication position slit 63 is also a portion formed by cutting up from a flat main surface 61 in the plate thickness direction in order to improve the heat transfer performance in the indoor fin 60, and in the indoor communication portion 64 of the indoor fin 60. , It is formed at multiple height positions. The communication position slit 63 is provided so as to correspond to the downstream side of the air flow direction of the main slit 62 provided at each height position. The communication position slit 63 is formed so that its longitudinal direction is in the vertical direction, and the upper end is higher than the upper end of the corresponding main slit 62 and the lower end is lower than the lower end of the corresponding main slit 62. It is formed long in the vertical direction.

These main slits 62 and communication position slits 63 are cut up from the flat main surface 61 to the same side in the plate thickness direction, and thus have openings on the upstream side and the downstream side in the air flow direction, respectively.

(4) Operation of the air conditioner Next, the operation of the air conditioner 1 will be described with reference to FIG. In the air conditioner 1, the compressor 8, the outdoor heat exchanger 11, the outdoor expansion valve 12, the indoor heat exchanger 51, and the cooling operation in which the refrigerant flows in this order, and the compressor 8, the indoor heat exchanger 51, the outdoor expansion valve 12, The heating operation in which the refrigerant flows in the order of the outdoor heat exchanger 11 is performed.

(4-1) Cooling operation During the cooling operation, the connection state of the four-way switching valve 10 is switched so that the outdoor heat exchanger 11 serves as a refrigerant radiator and the indoor heat exchanger 51 serves as a refrigerant evaporator (Fig.). See the solid line in 1). In the refrigerant circuit 6, the low-pressure gas refrigerant in the refrigeration cycle is sucked into the compressor 8, compressed to a high pressure in the refrigeration cycle, and then discharged. The high-pressure gas refrigerant discharged from the compressor 8 is sent to the outdoor heat exchanger 11 through the four-way switching valve 10. The high-pressure gas refrigerant sent to the outdoor heat exchanger 11 dissipates heat by exchanging heat with the outdoor air supplied as a cooling source by the outdoor fan 15 in the outdoor heat exchanger 11 that functions as a radiator of the refrigerant. , Becomes a high pressure liquid refrigerant. This high-pressure liquid refrigerant is depressurized to a low pressure in the refrigeration cycle when passing through the outdoor expansion valve 12, becomes a gas-liquid two-phase state refrigerant, and is passed through the liquid side closing valve 13 and the liquid refrigerant connecting pipe 4. It is sent to the indoor unit 3.

The low-pressure gas-liquid two-phase state refrigerant evaporates in the indoor heat exchanger 51 by exchanging heat with the indoor air supplied as a heating source by the indoor fan 52 during the cooling operation. As a result, the air passing through the indoor heat exchanger 51 is cooled, and the indoor is cooled. At this time, moisture contained in the air passing through the indoor heat exchanger 51 is condensed, so that dew condensation water is generated on the surface of the indoor heat exchanger 51. The low-pressure gas refrigerant evaporated in the indoor heat exchanger 51 is sent to the outdoor unit 2 through the gas refrigerant connecting pipe 5.

The low-pressure gas refrigerant sent to the outdoor unit 2 is sucked into the compressor 8 again through the gas side closing valve 14, the four-way switching valve 10, and the accumulator 7. In the cooling operation, the refrigerant circulates in the refrigerant circuit 6 as described above.

(4-2) Heating operation During the heating operation, the connection state of the four-way switching valve 10 is switched so that the outdoor heat exchanger 11 serves as a refrigerant evaporator and the indoor heat exchanger 51 serves as a refrigerant radiator (FIG. See the broken line in 1). In the refrigerant circuit 6, the low-pressure gas refrigerant in the refrigeration cycle is sucked into the compressor 8, compressed to a high pressure in the refrigeration cycle, and then discharged. The high-pressure gas refrigerant discharged from the compressor 8 is sent to the indoor unit 3 through the four-way switching valve 10, the gas side closing valve 14, and the gas refrigerant connecting pipe 5.

The high-pressure gas refrigerant exchanges heat with the indoor air supplied as a cooling source by the indoor fan 52 in the indoor heat exchanger 51 to dissipate heat and becomes a high-pressure liquid refrigerant. As a result, the air passing through the indoor heat exchanger 51 is heated to heat the room. The high-pressure liquid refrigerant radiated by the indoor heat exchanger 51 is sent to the outdoor unit 2 through the liquid refrigerant connecting pipe 4.

The high-pressure liquid refrigerant sent to the outdoor unit 2 is depressurized to the low pressure of the refrigeration cycle in the outdoor expansion valve 12 through the liquid side closing valve 13, and becomes a low-pressure gas-liquid two-phase state refrigerant. The low-pressure gas-liquid two-phase refrigerant decompressed by the outdoor expansion valve 12 exchanges heat with the outdoor air supplied as a heating source by the outdoor fan 15 in the outdoor heat exchanger 11 that functions as an evaporator of the refrigerant. Evaporates to become a low-pressure gas refrigerant. This low-pressure gas refrigerant is sucked into the compressor 8 again through the four-way switching valve 10 and the accumulator 7. In the heating operation, the refrigerant circulates in the refrigerant circuit 6 as described above.

(5) Features (5-1)
In general, the heat transfer coefficient of the indoor fins in the indoor heat exchanger can be increased by narrowing the interval in which the indoor flat tubes are provided. However, if the interval in which the indoor flat pipes are provided is narrowed, the flow velocity of the air flow passing between the indoor flat pipes increases, and the dew condensation water tends to scatter. Similarly, when the height of the indoor flat pipe in the vertical direction is large, the flow velocity of the air flow passing between the indoor flat pipes increases, and the dew condensation water tends to scatter. On the other hand, if the interval between the indoor flat tubes is widened, the heat transfer coefficient of the indoor fins will decrease, so the evaporation temperature of the refrigerant in the indoor heat exchanger will have to be lowered, and the environment will be prone to dew condensation water. It ends up.

On the other hand, in the indoor heat exchanger 51 of the present embodiment and the air conditioner 1 provided with the indoor heat exchanger 51, the HT is set to the vertical height of the indoor flat tube 55, and the DP is set to the vertical height of the plurality of indoor flat tubes 55. When the pitch is set, the one that satisfies the relationship of 4.0 ≦ DP / HT ≦ 10.0 is adopted. As described above, it is clear from the analysis data in which the values of DP and HT are changed that it is good to set the value of DP / HT of the indoor heat exchanger 51 in the numerical range for suppressing dew condensation. became.

That is, by setting the DP / HT value of the indoor heat exchanger 51 to 4.0 or more in this way, it is possible to prevent the flow velocity of the air flow flowing across the indoor fin 60 from becoming too large, and to prevent the indoor fan from becoming too large. Even when the air volume of 52 is increased and used, it is possible to suppress the scattering of dew condensation water from the leeward end portion caused by the large air flow.

Further, by setting the DP / HT value of the indoor heat exchanger 51 to 10.0 or less, the region of the indoor fin 60 far away from the indoor flat tube 55 is suppressed to a small size, and the heat transfer coefficient of the indoor fin 60 is suppressed. Therefore, the need to lower the evaporation temperature of the refrigerant of the indoor heat exchanger 51 in order to secure the capacity is suppressed, and the air volume of the indoor fan 52 is increased by making it difficult for dew condensation water to occur. It is possible to suppress the scattering of dew condensation water from the indoor fins 60 even when the indoor fins 60 are used.

When the indoor heat exchanger 51 is configured to satisfy the relationship of 4.6 ≤ DP / HT ≤ 8.0, the effect of suppressing the scattering of dew condensation water can be made more remarkable. Become.

(5-2)
Generally, in an outdoor heat exchanger used in an outdoor unit of an air conditioner, ventilation resistance tends to increase due to frost formation at the outdoor fins when the refrigerant is made to function as an evaporator. It is required to take a wide range. When an attempt is made to divert a heat exchanger having the same structure as an outdoor heat exchanger having a structure having a wide flat tube pitch to an indoor heat exchanger, the heat transfer rate of the indoor fins increases due to the wide pitch of the flat tube. The temperature is lowered, and the evaporation temperature of the refrigerant in the indoor heat exchanger has to be lowered, so that dew condensation water is likely to occur.

On the other hand, in the indoor heat exchanger 51 of the present embodiment and the air conditioner 1 provided with the indoor heat exchanger 51, the HT is set to the vertical height of the flat tubes 90 and 55, and the DP is set to the height of the plurality of flat tubes 90 and 55. When the pitch is set in the vertical direction, the relationship in which the DP / HT value of the indoor heat exchanger 51 is smaller than the DP / HT value of the outdoor heat exchanger 11 is satisfied.

Therefore, in the outdoor heat exchanger 11 in which the scattering of the dew condensation water is not a problem, the indoor heat exchanger 51 in which the scattering of the dew condensation water tends to be a problem while suppressing frost formation when used as an evaporator is used. When the heat transfer rate of the indoor fin 60 is improved and used as an evaporator, the need to lower the evaporation temperature of the refrigerant of the indoor heat exchanger 51 is suppressed, and dew condensation water is less likely to occur. It is possible to suppress the scattering of water.

(5-3)
The indoor heat exchanger 51 of the present embodiment has an upwind heat exchange unit 70 and a leeward heat exchange unit 80, and adopts a structure in which at least two or more rows of indoor flat tubes 55 are arranged.

Therefore, of the dew condensation water generated in the indoor heat exchanger 51, the dew condensation water generated in the upwind heat exchange section 70 is a portion between the upwind heat exchange section 70 and the downwind heat exchange section 80 or the downwind heat exchange section 80. It becomes easy to guide it downward and drain it. Further, since the leeward heat exchange unit 80 is supplied with air having an increased degree of dryness due to the formation of dew condensation water in the leeward heat exchange unit 70 when passing through the leeward heat exchange unit 70, the leeward heat exchange unit 80 is supplied with air. It is possible to suppress the amount of dew condensation water generated in the portion 80 to a small extent, and it is possible to suppress the scattering of the dew condensation water from the leeward side end portion of the leeward heat exchange portion 80.

(5-4)
In the indoor heat exchanger 51 of the present embodiment, the indoor fin 60 is provided with an indoor communication portion 64 on the leeward side of the indoor flat tube 55. Therefore, it is easy to guide the dew condensation water generated in the indoor flat pipe 55 downward while transmitting it to the indoor communication portion 64 of the indoor fin 60 located on the downstream side in the air flow direction to drain the water. Therefore, it is possible to suppress the scattering of dew condensation water from the downstream end portion of the indoor fin 60 in the air flow direction.

In particular, in the indoor heat exchanger 51 of the present embodiment, in a structure in which two or more rows of indoor flat tubes 55 are arranged, an indoor communication portion 64 is provided on the downstream side of the indoor fin 60 of the leeward heat exchange portion 80. It is possible to improve the drainage property of the generated dew condensation water while suppressing the generation of the dew condensation water at the downstream end portion of the indoor fin 60.

(5-5)
In the indoor heat exchanger 51 of the present embodiment, when the WF is the length of the indoor fin 60 in the air flow direction and the WL is the length of the indoor communication portion 64 in the air flow direction, 0.2 ≦ WL / WF ≦ 0. I try to satisfy the relationship of .5. In this way, by setting the WL / WF value in the indoor fin 60 to 0.2 or more, the width of the indoor communication portion 64 in the air flow direction is sufficiently secured, and the dew condensation water generated in the indoor heat exchanger 51 is removed. It is easy to drain the water downward through the indoor communication portion 64. Further, by setting the WL / WF value of the indoor fin 60 to 0.5 or less, the region of the indoor fin 60 that is far from the indoor flat tube 55 and is difficult to contribute to the improvement of heat transfer performance can be suppressed to a small size. Therefore, it becomes possible to suppress the material cost while maintaining the performance of the indoor fin 60.

In particular, the indoor communication portion 64 is located on the indoor fin 60 on the downstream side in the air flow direction of the indoor flat pipe 55, and the WL / WF value of the indoor fin 60 is set to 0.2 or more. It is possible to improve the drainage property of the dew condensation water generated in the flat pipe 55 through the indoor communication portion 64.

(5-6)
In the indoor heat exchanger 51 of the present embodiment, the indoor fin 60 is provided with a main slit 62 and a communication position slit 63 which are cut and raised so as to generate an opening in the air flow direction. Therefore, the air supplied to the indoor heat exchanger 51 can be sufficiently brought into contact with the indoor fins 60, and the air heat source can be fully utilized.

Since the upper ends of the main slit 62 and the communication position slit 63 are provided so as to be located near the lower portion of the indoor flat pipe 55 located directly above, dew condensation water generated in the indoor flat pipe 55 directly above the main slit 62 and the communication position slit 63. It is easy to catch and guide it downward, and it is possible to improve drainage. In particular, as shown in FIG. 12, on the lower flat surface 55b side of the indoor flat tube 55, the position where the fin collar portion 65a has started to rise with respect to the main surface 61 of the indoor fin 60 and the main slit 62 of the indoor fin 60. By designing the distance DS between the point where the cutting and raising of the pipe is started to be 1 mm or less, the retention of dew condensation water on the lower flat surface 55b side of the indoor flat pipe 55 is suppressed and the drainage performance is improved. Is done.

(6) Modification example (6-1) Modification example A
In the above embodiment, the case where the downstream end portion of the indoor fin 60 has a flat shape has been described as an example.

However, the shape of the downstream end of the indoor fin 60 is not limited to this, and for example, as described below, the interior has a water guiding rib 99 extending along the downstream end in the air flow direction. Fins 60a may be used.

FIG. 13 shows the positional relationship between the indoor fin 60a and the indoor flat pipe 55, and FIG. 14 shows the portion of the water guide rib 99 in the BB cross section of FIG. 13 near the downstream side in the air flow direction.

The indoor heat exchanger 51 according to the present modification A also has an upwind heat exchange unit 70 and a downwind heat exchange unit 80, as in the above embodiment, and is configured to include an upwind heat exchange unit 70 and a downwind heat exchange unit 70. In each of the indoor fins 60a of the heat exchange portion 80, a water guiding rib 99 extending vertically along the downstream end of the indoor communication portion 64 provided on the downstream side in the air flow direction is provided. .. As shown in FIG. 14, the water guide rib 99 is configured to be recessed in the plate thickness direction of the indoor fin 60a with respect to the surrounding main surface 61. The water guide rib 99 is not particularly limited, but is preferably configured to be recessed by a plate thickness or more of the indoor fin 60a.

By providing the water guide rib 99 in the indoor fin 60a in this way, the dew condensation water generated in the indoor heat exchanger 51 is captured by the water guide rib 99, and it becomes easy to guide the dew condensation water downward through the water guide rib 99. .. Therefore, it is possible to prevent the dew condensation water from reaching the leeward end of the indoor fin 60a, and to sufficiently suppress the scattering of the dew condensation water.

The water guide rib 99 is preferably provided on the downstream side of half the width of the indoor communication portion 64 in the indoor communication portion 64 in the air flow direction, and the air flow in the width of the indoor communication portion 64 in the air flow direction. It is more preferable that it is provided at a position within 20% from the downstream end in the direction.

In the indoor fin 60a provided with the water guide rib 99, the relationship between the width WL in the air flow direction of the indoor communication portion 64 of the indoor fin 60 and the width WF in the air flow direction of the indoor fin 60 is particularly high. It is preferable that the relationship of 0.2 ≦ WL / WF is satisfied.

(6-2) Modification B
In the above embodiment, the case where the indoor heat exchanger 51 has the upwind heat exchange unit 70 and the leeward heat exchange unit 80 and the indoor flat pipes 55 are provided side by side in two rows has been described as an example.

However, the number of rows of the indoor flat tube 55 included in the indoor heat exchanger 51 in the air flow direction is not limited to two, and may be three or more rows. By increasing the number of rows of the indoor flat pipe 55 in this way, it becomes possible to more effectively suppress the scattering of dew condensation water from the downstream end portion of the indoor heat exchanger 51 in the air flow direction.

(6-3) Modification C
In the above embodiment, in the indoor heat exchanger 51, the plurality of indoor flat tubes 55 belonging to the upwind heat exchange section 70 and the plurality of indoor flat tubes 55 belonging to the downwind heat exchange section 80 are mutually arranged in the air flow direction view. The case where they are arranged so as to overlap each other has been described as an example.

However, the indoor heat exchanger 51 is not limited to this, and the plurality of indoor flat tubes 55 belonging to the heat exchange section on the leeward side and the plurality of indoor flat tubes 55 belonging to the heat exchange section on the leeward side. And may be arranged so as not to overlap each other in the air flow direction view. As a result, it becomes possible to sufficiently apply the air flow to both the indoor flat pipe 55 located on the windward side and the indoor flat pipe 55 located on the leeward side.

(6-4) Modification D
In the above embodiment, in the indoor fin 60 of the indoor heat exchanger 51, a main slit configured by being cut up so that the entire slit piece is located on one side in the plate thickness direction with respect to the main surface 61 of the indoor fin 60. The case where the 62 and the communication position slit 63 are provided has been described as an example.

However, the cut-up formed in the indoor fin 60 is not limited to this, and instead of the main slit 62 and the communication position slit 63, for example, for the cut-up raised slit piece, the windward end of the slit piece in the air flow direction. The portion is located on one side of the main surface 61 of the indoor fin 60 in the plate thickness direction, and the leeward end portion of the slit piece in the air flow direction is located on the other side of the main surface 61 of the indoor fin 60 in the plate thickness direction. A structure called a louver may be adopted.

Although the embodiments and modifications of the present disclosure have been described above, it is understood that various changes in the form and details are possible without departing from the spirit and scope of the present disclosure described in the claims. Will.

1 Air conditioner 2 Outdoor unit (outdoor unit)
3 Indoor unit (indoor unit)
11 Outdoor heat exchanger 51 Indoor heat exchanger 55 Indoor flat tube 55c Flow path 60 Indoor fin (heat transfer fin)
62 Main slit (raised part)
63 Communication position slit (cut-up part)
64 Indoor communication section (communication section)
65 Wind upper part (each part located between the flat pipes lined up and down)
90 Outdoor flat tube (flat tube)
90c Flow path 91 Outdoor fin 97a Communication part 97b Wind lower

Patent Document 1: Japanese Unexamined Patent Publication No. 2016-041986

Claims (4)

An indoor heat exchanger (51) used in the indoor unit (3) of the air conditioner (1).
It has a flow path (55c) through which the refrigerant passes, and has a plurality of flat pipes (55) arranged one above the other.
A plurality of heat transfer fins (60) joined to the plurality of the flat tubes,
Equipped with
The heat transfer fins are connected to each portion (65) located between the flat tubes arranged one above the other, and are located on the leeward side of the flat tubes in the air flow direction and extend vertically (a communication portion). 64) and a cut-up portion (62, 63) whose longitudinal direction is the vertical direction .
When the height of the flat tubes is HT and the pitch of the flat tubes arranged vertically is DP.
4. 6 ≤ DP / HT ≤ 8 . Satisfy the relationship of 0,
Indoor heat exchanger. The flat tube has a plurality of upstream flat tubes arranged on the upstream side in the air flow direction and a plurality of downstream flat tubes arranged on the downstream side in the air flow direction from the upstream flat tube. is doing,
The indoor heat exchanger according to claim 1 . When the length of the heat transfer fin in the air flow direction is WF and the length of the communication portion in the air flow direction is WL.
Satisfying the relationship of 0.2 ≤ WL / WF ≤ 0.5,
The indoor heat exchanger according to claim 1 or 2 . The indoor unit (3) having the indoor heat exchanger (51) according to any one of claims 1 to 3 .
An outdoor unit (2) having an outdoor heat exchanger (11) and
An air conditioner (1).

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