JP2017198385A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger contributing to improvement of the performance thereof.SOLUTION: An indoor heat exchanger 21 comprises a plurality of heat exchange portions 50 (first heat exchange portion 51 and second heat exchange portion 52), and a shielding member 80 for shielding a clearance between the heat exchange portions 50 against airflow AF. The heat exchange portions 50 have a plurality of heat transfer tubes 60 and a plurality of heat transfer fins 65 and are portions causing the passing airflow AF and a refrigerant in the heat transfer tubes 60 to exchange heat between them. An end portion 512 of the first heat exchange portion 51 and an end portion 522 of the second heat exchange portion 52 are disposed in adjacent to each other at an interval. The second heat exchange portion 52 is extended from the end portion 522 in a direction different from an extending direction of the first heat exchange portion 51 from the end portion 512. A liquid communication pipe LP and a gas communication pipe GP are independently connected to the end portion 511 and the end portion 521. The shielding member 80 is disposed in a space SP2 formed between the end portion 512 and the end portion 522, and includes a wind shielding surface 81 for shielding the airflow AF.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a heat exchanger.

  Conventionally, it has a heat exchange part including a plurality of heat transfer tubes arranged at intervals in a predetermined direction and a plurality of heat transfer fins arranged at intervals in a direction intersecting the direction, and the heat exchange part A heat exchanger that exchanges heat between the air flow passing through the refrigerant and the refrigerant in the heat transfer tube is widely used.

  For example, Patent Document 1 (Japanese Patent Laid-Open No. 2007-285604) discloses a so-called cross fin tube type having a heat exchanging portion including a plurality of plate-like heat transfer fins and a heat transfer tube penetrating each heat transfer fin. A heat exchanger (cross fin heat exchanger) is disclosed. In a cross fin heat exchanger, a copper tube having a circular cross section is generally used as a heat transfer tube. In Patent Document 1, in order to ensure a large heat transfer area, the heat exchanging section has a plurality of (four) surfaces surrounding the blower (that is, the heat exchanger tube has one or more curved portions in the heat exchanger). And has a shape that extends in multiple directions as well as in one direction.

  Patent Document 2 (Japanese Patent Laid-Open No. 2015-127620) discloses a so-called microchannel type heat exchanger (microchannel) having a flat multi-hole tube having a plurality of minute refrigerant channels formed therein as a heat transfer tube. A heat exchanger) is disclosed. In a microchannel heat exchanger, generally, a flat multi-hole tube made of aluminum or aluminum alloy is used as a heat transfer tube, and a slit fin that press-fits the heat transfer tube into a corrugated fin or a slit is used as a heat transfer fin.

  Here, in principle, microchannel heat exchangers have better heat transfer performance than cross-fin tube heat exchangers, so in recent years, the introduction of microchannel heat exchangers has been promoted in various refrigeration devices that perform refrigeration cycles. ing.

  However, in the microchannel heat exchanger, since the cross-sectional area of each refrigerant flow path formed in the heat transfer tube (flat multi-hole tube) is narrow, it depends on the shape of the heat exchanger or the flow path length in the heat transfer tube. The pressure loss of the refrigerant in the heat transfer tube tends to be larger than that of the cross fin tube heat exchanger. In particular, a microchannel heat exchanger is applied as a heat exchanger in a mode as disclosed in Patent Document 1 (that is, in the heat exchanger, the heat transfer tubes are arranged not only in one direction but also in a plurality of directions). In some cases, the greater the number of curved portions of the heat transfer tube, the greater the pressure loss of the refrigerant in the heat transfer tube.

  For this reason, application of a microchannel heat exchanger is restricted depending on the shape of the heat exchanger. That is, the performance improvement of the heat exchanger is restricted.

  Then, the subject of this invention is providing the heat exchanger which contributes to a performance improvement.

  A heat exchanger according to a first aspect of the present invention includes a plurality of heat exchange units and a shielding member. The heat exchange unit has a plurality of flat multi-hole tubes and a plurality of heat transfer fins. A heat exchange part is a part which heat-exchanges the air flow which passes and the refrigerant | coolant in a flat multi-hole pipe. The shielding member shields the gap between the heat exchange parts from the air flow. The plurality of heat exchange units include a first heat exchange unit and a second heat exchange unit. The first end, which is one end of the first heat exchange unit, and the second end, which is one end of the second heat exchange unit, are arranged close to each other with a space therebetween. The second heat exchange unit extends from the second end in a direction different from the direction in which the first heat exchange unit extends from the first end. A liquid refrigerant pipe and a gas refrigerant pipe are individually connected to the other end of the first heat exchange section and the other end of the second heat exchange section. The liquid refrigerant pipe is a refrigerant pipe through which the liquid refrigerant flows. The gas refrigerant pipe is a refrigerant pipe through which the gas refrigerant flows. The shielding member is disposed in a space formed between the first end and the second end. The shielding member includes a wind shielding surface. The wind shielding surface blocks the flow of air.

  In the heat exchanger according to the first aspect of the present invention, the plurality of heat exchange units include a first heat exchange unit and a second heat exchange unit extending in a direction different from the direction in which the first heat exchange unit extends. The first end, which is one end of the first heat exchange unit, and the second end, which is one end of the second heat exchange unit, are arranged in close proximity to each other, and the other end of the first heat exchange unit and the second heat A liquid refrigerant pipe and a gas refrigerant pipe are individually connected to the other end of the exchange unit. Thereby, a heat exchanger is comprised using the 1st heat exchange part and 2nd heat exchange part which are spaced apart. In other words, the heat exchanger is configured by combining the separated first heat exchange unit and second heat exchange unit. As a result, even if the heat exchanger has a mode in which the heat transfer tubes are arranged so as to extend not only in one direction but also in a plurality of directions, the heat exchanger uses the first heat exchange unit and the second heat exchange unit that are separated from each other. By comprising, it becomes possible to reduce the number of the curved parts of the heat exchanger tube in each heat exchange part. For this reason, also when applying a microchannel heat exchanger as a heat exchanger of the aspect arrange | positioned so that a heat exchanger tube may be extended not only in one direction but in multiple directions, the performance fall by the pressure loss in a heat exchanger tube is suppressed. It becomes possible.

  Moreover, a shielding member is arrange | positioned in the clearance gap between a 1st heat exchange part and a 2nd heat exchange part, and it is suppressed that an air flow passes the said clearance gap part by the wind-shielding surface. That is, air that has not passed through the heat exchanging section (that is, air that has not exchanged heat with the refrigerant in the heat transfer tubes) is prevented from flowing from the windward side of the heat exchanger to the leeward side. As a result, performance degradation of the heat exchanger when the heat exchanger is configured using the first heat exchange unit and the second heat exchange unit that are separated from each other is suppressed.

  Therefore, the performance improvement of the heat exchanger is promoted.

  The “first end” is one end of the first heat exchange part when viewed from the direction in which the flat multi-hole tubes are arranged in the first heat exchange part, and the flat multi-hole included in the first heat exchange part It is a portion including one end of the tube. The “second end portion” is one end of the second heat exchange portion when viewed from the direction in which the flat multi-hole tubes are arranged in the second heat exchange portion, and the flat multi-hole included in the second heat exchange portion. It is a portion including one end of the tube.

  The heat exchanger which concerns on the 2nd viewpoint of this invention is a heat exchanger which concerns on a 1st viewpoint, Comprising: A wind-shielding surface is a curved surface where a cross section curves in circular arc shape.

  Thereby, according to a situation (for example, according to the direction where the 1st heat exchange part or the 2nd heat exchange part extends from the 1st end part or the 2nd end part), the installation mode of a shielding member is selected flexibly. Is possible. That is, it is excellent in versatility and assemblability.

  The heat exchanger which concerns on the 3rd viewpoint of this invention is a heat exchanger which concerns on a 1st viewpoint or a 2nd viewpoint, Comprising: A shielding member further contains a fixing | fixed part. A fixing | fixed part fixes a heat exchange part with respect to the casing in which a heat exchange part is accommodated.

  Thereby, it becomes possible to make a shielding member function as a fixing member for fixing a heat exchange part to a casing. That is, the shielding member can have both a function as a wind shielding member and a function as a fixing member. As a result, the number of parts for the fixing member can be reduced, and the cost can be reduced.

  A heat exchanger according to a fourth aspect of the present invention is the heat exchanger according to any one of the first to third aspects, wherein the shielding member is made of a material having a standard potential smaller than that of the flat multi-hole tube. The

  Thereby, the electrochemical corrosion (electric corrosion) of a flat multi-hole pipe is suppressed. Therefore, reliability and durability are improved.

  The heat exchanger which concerns on the 5th viewpoint of this invention is a heat exchanger which concerns on either of a 1st viewpoint to the 4th viewpoint, Comprising: A wind-shielding surface faces the upstream of the air flow of a 1st edge part. It extends continuously between the portion and the portion facing the upstream side of the air flow at the second end.

  Thereby, the space between each heat exchange part can be easily shielded against the air flow. Moreover, it becomes easy to connect a shielding member to each heat exchange part, and assembly property improves.

  The heat exchanger which concerns on the 6th viewpoint of this invention is a heat exchanger which concerns on either of the 1st viewpoint to the 4th viewpoint, Comprising: A wind-shielding surface faces the downstream of the airflow of a 1st edge part. It extends continuously between the portion and the portion facing the downstream side of the air flow at the second end.

  Thereby, the space between each heat exchange part can be easily shielded against the air flow. Moreover, it becomes easy to connect a shielding member to each heat exchange part, and assembly property improves.

  A heat exchanger according to a seventh aspect of the present invention is the heat exchanger according to any one of the first to sixth aspects, wherein the shielding member includes a first contact part, a second contact part, Further included. A 1st contact part is a part shape | molded by the comb-tooth shape by forming several 1st slits. A 1st contact part is a part contact | abutted in the 1st edge part with the flat multi-hole tube of a 1st heat exchange part. The first edge is the edge of the first slit. A 2nd contact part is a part shape | molded by the comb-tooth shape by forming several 2nd slit. A 2nd contact part is a part contact | abutted with the flat multi-hole tube of a 2nd heat exchange part in a 2nd edge part. The second edge is the edge of the second slit. The first contact portion is disposed at the end of the wind shield surface on the first heat exchange portion side. A 2nd contact part is arrange | positioned at the edge part by the side of the 2nd heat exchange part of a wind-shielding surface.

  Thereby, it becomes easy to connect a shielding member and a heat exchange part. In other words, the shielding member is formed with a slit that contacts each flat multi-hole tube, so that positioning and fixing when the shielding member is installed between the heat exchanging portions are facilitated. Therefore, the assemblability is improved.

  The heat exchanger which concerns on the 8th viewpoint of this invention is a heat exchanger which concerns on a 7th viewpoint, Comprising: The flange extended along the direction where a flat multi-hole tube is extended in a 1st edge part or a 2nd edge part. Provided.

  Thereby, when inserting a flat multi-hole pipe | tube into each slit, it is suppressed that a flat multi-hole pipe | tube is damaged by the friction and collision with the edge part of each slit. As a result, the performance degradation resulting from damage to the flat multi-hole tube is suppressed.

  In addition, a flange is provided by shape | molding a 1st edge part or a 2nd edge part by burring processing, for example.

  A heat exchanger according to a ninth aspect of the present invention is the heat exchanger according to the seventh aspect or the eighth aspect, wherein the shielding member is brazed and joined to the first heat exchange part and / or the second heat exchange part. Is done. A brazing material is disposed on the first edge and / or the second edge.

  Thereby, the brazing property at the time of brazing and joining a shielding member to a heat exchange part improves. That is, the assemblability is improved.

  A heat exchanger according to a tenth aspect of the present invention is the heat exchanger according to any one of the first to ninth aspects, and further includes a first header collecting pipe and a second header collecting pipe. The first header collecting pipe is connected to the first end. The second header collecting pipe is connected to the second end. In the first header collecting pipe and the second header collecting pipe, a communication space is formed which communicates the refrigerant flow paths in different flat multi-hole pipes.

  Thereby, the increase in the pressure loss of the refrigerant | coolant in a 1st end part and a 2nd end part is suppressed. Therefore, when a heat exchanger is comprised using the 1st heat exchange part and 2nd heat exchange part which are spaced apart, the performance fall of a heat exchanger is suppressed.

  In the heat exchanger according to the first aspect of the present invention, the heat exchanger is configured by combining the first heat exchange unit and the second heat exchange unit that are separated from each other. As a result, even if the heat exchanger has a mode in which the heat transfer tubes are arranged so as to extend not only in one direction but also in a plurality of directions, the heat exchanger uses the first heat exchange unit and the second heat exchange unit that are separated from each other. By comprising, it becomes possible to reduce the number of the curved parts of the heat exchanger tube in each heat exchange part. For this reason, also when applying a microchannel heat exchanger as a heat exchanger of the aspect arrange | positioned so that a heat exchanger tube may be extended not only in one direction but in multiple directions, the performance fall by the pressure loss in a heat exchanger tube is suppressed. It becomes possible.

  Moreover, a shielding member is arrange | positioned in the clearance gap between a 1st heat exchange part and a 2nd heat exchange part, and it is suppressed that an air flow passes the said clearance gap part by the wind-shielding surface. That is, air that has not passed through the heat exchange section (that is, air that has not exchanged heat with the refrigerant in the heat transfer tubes) is suppressed from flowing out of the heat exchanger. As a result, performance degradation of the heat exchanger when the heat exchanger is configured using the first heat exchange unit and the second heat exchange unit that are separated from each other is suppressed. Therefore, the performance improvement of the heat exchanger is promoted.

  The heat exchanger according to the second aspect of the present invention is excellent in versatility and assembly.

  In the heat exchanger according to the third aspect of the present invention, the number of parts for the fixing member can be reduced, and the cost can be reduced.

  In the heat exchanger according to the fourth aspect of the present invention, reliability and durability are improved.

  In the heat exchanger according to the fifth aspect and the sixth aspect of the present invention, the space between the heat exchange units can be easily shielded against the air flow. Moreover, it becomes easy to connect a shielding member to each heat exchange part, and assembly property improves.

  In the heat exchanger according to the seventh aspect of the present invention, the assemblability is improved.

  In the heat exchanger according to the eighth aspect of the present invention, performance degradation due to damage to the flat multi-hole tube is suppressed.

  In the heat exchanger according to the ninth aspect of the present invention, the assemblability is improved.

  In the heat exchanger which concerns on the 10th viewpoint of this invention, when a heat exchanger is comprised using the 1st heat exchange part and 2nd heat exchange part which are spaced apart, the performance fall of a heat exchanger is suppressed.

The schematic block diagram of the air conditioning apparatus containing the indoor heat exchanger which concerns on one Embodiment of this invention. The perspective view of an indoor unit. The schematic diagram which showed the III-III line cross section of FIG. The schematic diagram which showed schematic structure of the indoor unit in the bottom view. The schematic diagram which showed schematically the indoor heat exchanger in planar view. The perspective view of the indoor heat exchanger of the state which has not joined the shielding member. The perspective view which showed a part of heat exchange part. The schematic diagram of the VIII-VIII line cross section of FIG. The schematic diagram shown roughly about the connection aspect of each gas header collecting pipe or each liquid header collecting pipe, and a heat exchanger tube. The schematic diagram shown roughly about the connection aspect of each folding header collection pipe and a heat exchanger tube. The perspective view of an indoor heat exchanger. The external view of a shielding member. The schematic diagram which showed the state which looked at the 1st contact part or the 2nd contact part in the state by which the heat exchanger tube was inserted in the slit from the A direction of FIG. In the indoor heat exchanger manufacturing process, regarding the indoor heat exchanger in the state in which the fourth process is completed, the fifth process of rotating one heat exchanging part by 90 degrees around the central portion of the wind shield surface is shown in a plan view. Schematic diagram. The schematic diagram which showed the case where the shielding member is arrange | positioned in the aspect which concerns on the modification D. FIG. The external view of the shielding member which concerns on the modification F. FIG. The external view of the shielding member which concerns on the modification G.

  Hereinafter, an indoor heat exchanger 21 according to an embodiment of the present invention will be described with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention, and can be modified as appropriate without departing from the scope of the invention. In the following embodiments, directions such as up, down, left, right, front, and back mean the directions shown in FIGS. 2 to 5 and 15. 2 to 12 and 15 correspond to the left-right direction, the y-direction corresponds to the front-rear direction, and the z-direction corresponds to the up-down direction.

  In the present embodiment, the indoor heat exchanger 21 is applied to the air conditioner 100.

(1) Air conditioner 100
FIG. 1 is a schematic configuration diagram of an air conditioner 100 including an indoor heat exchanger 21 according to an embodiment of the present invention.

  The air conditioning apparatus 100 is an apparatus that realizes air conditioning in a target space by performing a cooling operation or a heating operation. Specifically, the air conditioning apparatus 100 performs a vapor compression refrigeration cycle. The air conditioner 100 mainly includes an outdoor unit 10 as a heat source side unit and an indoor unit 20 as a use side unit. In the air conditioner 100, the outdoor unit 10 and the indoor unit 20 are connected by a gas communication pipe GP (gas refrigerant pipe) and a liquid communication pipe LP (liquid refrigerant pipe), whereby the refrigerant circuit RC is configured. Yes.

(1-1) Outdoor unit 10
The outdoor unit 10 is installed outdoors. The outdoor unit 10 mainly includes a compressor 11, a four-way switching valve 12, an outdoor heat exchanger 13, an expansion valve 14, and an outdoor fan 15.

  The compressor 11 is a mechanism that sucks low-pressure gas refrigerant, compresses it, and discharges it. The compressor 11 is inverter-controlled during operation, and the rotation speed is adjusted according to the situation.

  The four-way switching valve 12 is a switching valve for switching the direction in which the refrigerant flows when switching between the cooling operation and the heating operation. The four-way switching valve 12 can be switched in state (refrigerant flow path) according to the operation mode.

  The outdoor heat exchanger 13 is a heat exchanger that functions as a refrigerant condenser during a cooling operation and functions as a refrigerant evaporator during a heating operation.

  The expansion valve 14 is an electric valve that depressurizes the flowing high-pressure refrigerant. The opening degree of the expansion valve 14 is adjusted as appropriate according to the operating situation.

  The outdoor fan 15 is a blower that generates an outdoor air flow that flows into the outdoor unit 10 from the outside, passes through the outdoor heat exchanger 13, and flows out of the outdoor unit 10.

(1-2) Indoor unit 20
The indoor unit 20 is installed indoors. The indoor unit 20 mainly includes an indoor heat exchanger 21 and an indoor fan 22.

  The indoor heat exchanger 21 is a heat exchanger that functions as a refrigerant evaporator during cooling operation and functions as a refrigerant condenser during heating operation. The indoor heat exchanger 21 includes a plurality of heat transfer tubes 60 (see FIGS. 5 and 8 and the like) and a plurality of heat transfer fins 65 (see FIGS. 7 and 8 and the like). The indoor heat exchanger 21 has a gas side connected to the gas communication pipe GP and a liquid side connected to the liquid communication pipe LP. Details of the indoor heat exchanger 21 will be described later.

  The indoor fan 22 is a blower that generates an air flow AF (see FIGS. 3 to 5) that flows into the indoor unit 20 from the outside, passes through the indoor heat exchanger 21, and flows out of the indoor unit 20. The driving of the indoor fan 22 is controlled by an indoor control unit (not shown) during operation, and the number of rotations is appropriately adjusted.

(2) Flow of refrigerant in the air conditioner 100 In the air conditioner 100, the refrigerant circulates in the refrigerant circuit RC in the flow as shown below during the cooling operation or the heating operation. During operation, the opening degree of the expansion valve 14 and the rotation speed of the compressor 11 are adjusted as appropriate, and the refrigerant flowing through the refrigerant circuit RC may have a high circulation amount or a low circulation amount.

(2-1) During cooling operation During cooling operation, the four-way switching valve 12 is in the state shown by the solid line in FIG. 1, the discharge side of the compressor 11 communicates with the gas side of the outdoor heat exchanger 13, and the compressor 11 Is in communication with the gas side of the indoor heat exchanger 21.

  When the compressor 11 is driven in such a state, the low-pressure gas refrigerant is compressed by the compressor 11 to become a high-pressure gas refrigerant. The high-pressure gas refrigerant is sent to the outdoor heat exchanger 13 via the four-way switching valve 12. Thereafter, the high-pressure gas refrigerant is condensed and converted into a high-pressure liquid refrigerant by exchanging heat with the outdoor air flow in the outdoor heat exchanger 13. The high-pressure liquid refrigerant that has flowed out of the outdoor heat exchanger 13 is sent to the expansion valve 14. The low-pressure refrigerant decompressed in the expansion valve 14 is sent to the indoor heat exchanger 21 via the liquid communication pipe LP, and is evaporated to become a low-pressure gas refrigerant by exchanging heat with the air flow AF. The low-pressure gas refrigerant flows through the gas communication pipe GP and is sucked into the compressor 11.

(2-2) During heating operation During heating operation, the four-way switching valve 12 is in the state indicated by the broken line in FIG. 1, the discharge side of the compressor 11 communicates with the gas side of the indoor heat exchanger 21, and the compressor 11 Is in communication with the gas side of the outdoor heat exchanger 13.

  When the compressor 11 is driven in such a state, the low-pressure gas refrigerant is compressed by the compressor 11 to become a high-pressure gas refrigerant, and is transferred to the indoor heat exchanger 21 via the four-way switching valve 12 and the gas communication pipe GP. Sent. The high-pressure gas refrigerant sent to the indoor heat exchanger 21 is condensed to form a high-pressure liquid refrigerant by exchanging heat with the air flow AF, and then sent to the expansion valve 14 via the liquid communication pipe LP. It is done. The high-pressure gas refrigerant sent to the expansion valve 14 is depressurized according to the opening degree of the expansion valve 14 when passing through the expansion valve 14. The low-pressure refrigerant that has passed through the expansion valve 14 flows into the outdoor heat exchanger 13. The low-pressure refrigerant flowing into the outdoor heat exchanger 13 evaporates by exchanging heat with the outdoor air flow and becomes low-pressure gas refrigerant, and is sucked into the compressor 11 via the four-way switching valve 12.

(3) Details of Indoor Unit 20 FIG. 2 is a perspective view of the indoor unit 20. FIG. 3 is a schematic diagram showing a cross section taken along line III-III in FIG. FIG. 4 is a schematic diagram illustrating a schematic configuration of the indoor unit 20 in a bottom view.

  The indoor unit 20 is a so-called ceiling-embedded air conditioning indoor unit, and is installed on the ceiling of the target space. The indoor unit 20 has a casing 30 that forms an outer shell.

  The casing 30 accommodates the indoor heat exchanger 21, the indoor fan 22, and the like. The casing 30 is installed in a ceiling back space CS formed between the ceiling surface C1 and an upper floor or roof through an opening formed in the ceiling surface C1 of the target space. The casing 30 includes a top plate 31a, a side plate 31b, a bottom plate 31c, and a decorative panel 32.

  The top plate 31a is a member constituting the top surface portion of the casing 30, and has a substantially octagonal shape in which long sides and short sides are alternately and continuously formed. The side plate 31b is a member that constitutes a side surface portion of the casing 30, and includes a surface portion corresponding to the long side and the short valve of the top plate 31a on a one-to-one basis. The bottom plate 31 c is a member constituting the bottom surface portion of the casing 30, and a substantially rectangular large opening 311 is formed at the center, and a plurality of openings 312 are formed around the large opening 311. The bottom panel 31c has a decorative panel 32 attached to the lower surface side (target space side).

  The decorative panel 32 is a plate-like member exposed to the target space, and has a substantially rectangular shape in plan view. The decorative panel 32 is installed by being fitted into the opening of the ceiling surface C1. The decorative panel 32 is formed with an air inlet 33 and an air outlet 34 for airflow AF. The suction port 33 is largely formed in a substantially square shape at a position overlapping the large opening 311 of the bottom plate 31c in a plan view in the central portion of the decorative panel 32. The air outlet 34 is formed so as to surround the air inlet 33 around the air inlet 33.

  In the space in the casing 30, there are a suction flow path FP <b> 1 for guiding the air flow AF flowing into the casing 30 through the suction port 33 to the indoor heat exchanger 21, and an air flow that has passed through the indoor heat exchanger 21. A blow-out flow path FP2 for sending AF to the blow-out opening 34 is formed. The blowout flow path FP2 is disposed outside the suction flow path FP1 so as to surround the suction flow path FP1.

  In the casing 30, the indoor fan 22 is disposed in the center portion, and the indoor heat exchanger 21 is disposed so as to surround the indoor fan 22. The indoor fan 22 overlaps with the suction port 33 in plan view. The indoor heat exchanger 21 has a substantially rectangular shape in plan view, and is disposed so as to surround the suction port 33 and to be surrounded by the air outlet 34.

  In the indoor unit 20, the suction port 33, the blowout port 34, the suction flow path FP <b> 1, and the blowout flow path FP <b> 2 are formed in the manner described above, and the indoor heat exchanger 21 and the indoor fan 22 are arranged, During operation, the air flow AF generated by the indoor fan 22 flows into the casing 30 via the suction port 33 and is guided to the indoor heat exchanger 21 via the suction flow path FP1 and inside the indoor heat exchanger 21. After performing heat exchange with the refrigerant, the refrigerant is sent to the blowout port 34 via the blowout flow path FP2 and blown out from the blowout port 34 to the target space.

  In the following description, a direction in which the air flow AF flows when passing through the indoor heat exchanger 21 is referred to as an “air flow direction”. In the present embodiment, the air flow direction corresponds to the x direction (that is, the left-right direction) or the y direction (that is, the front-rear direction).

(4) Details of Indoor Heat Exchanger 21 FIG. 5 is a schematic diagram schematically showing the indoor heat exchanger 21 in plan view. FIG. 6 is a perspective view of the indoor heat exchanger 21 in a state where the shielding member 80 is not joined. FIG. 7 is a perspective view showing a part of the heat exchange unit 50. FIG. 8 is a schematic diagram of a section taken along line VIII-VIII in FIG.

  The indoor heat exchanger 21 mainly includes a plurality of heat exchange units 50, a plurality of header collecting pipes 70, and a shielding member 80.

(4-1) Heat exchange unit 50
The heat exchanging part 50 is a part for exchanging heat between the passing air flow AF and the refrigerant. The indoor heat exchanger 21 has a plurality (two in this case) of heat exchange units 50. Specifically, the indoor heat exchanger 21 includes a first heat exchange unit 51 and a second heat exchange unit 52 as the heat exchange unit 50.

  The 1st heat exchange part 51 and the 2nd heat exchange part 52 are exhibiting substantially L shape in plane view. In the first heat exchange unit 51 and the second heat exchange unit 52, one end 511 of the first heat exchange unit 51 and one end 521 of the second heat exchange unit 52 are close to each other, and the first heat exchange unit 51, the other end 512 (corresponding to “first end” in claims) and the other end 522 of the second heat exchange portion 52 (corresponding to “second end” in claims) And are arranged so as to be close to each other.

  In other words, the second heat exchanging part 52 extends in a direction in which the first heat exchanging part 51 extends from the end part 511 or 512 from a part (end part 521 or end part 522) close to the end part 512 of the first heat exchanging part 51. It extends along a direction (y direction or x direction) different from (x direction or y direction). The first heat exchange unit 51 in such a mode (a mode in which each heat exchange unit 50 extends from an end close to the other heat exchange unit 50 along a direction different from the direction in which the other heat exchange unit 50 extends). And the 2nd heat exchange part 52 is arrange | positioned, the indoor heat exchanger 21 is exhibiting substantially square shape in planar view, and surrounds the indoor fan 22 with the heat exchange part 50 (namely, indoor fan 22). Have four sides).

  In the indoor heat exchanger 21, the end 511 of the first heat exchange unit 51 and the end 521 of the second heat exchange unit 52 are separated from each other, and a space SP1 is formed between them (FIG. 6). reference). A partition plate (not shown) is installed in the space SP1. Further, the end 512 of the first heat exchanging part 51 and the end 522 of the second heat exchanging part 52 are separated from each other, and a space SP2 is formed between them. A shielding member 80 is disposed in the space SP2 (see FIG. 11 and the like).

  The first heat exchange unit 51 and the second heat exchange unit 52 include a first part 501, a second part 502, and a bending part 503, respectively.

  The first portion 501 is a substantially I-shaped portion that extends linearly along the x direction or the y direction in plan view. The second part 502 is a substantially I-shaped part extending linearly along a direction (y direction or x direction) intersecting the direction in which the first part 501 extends in plan view. The curved portion 503 is a portion that connects the first portion 501 and the second portion 502. The curved portion 503 is curved in a substantially L shape in plan view, and one end of the curved portion 503 is connected to one end of the first portion 501, and the other end of the curved portion 503 is connected to one end of the second portion 502. ing.

  In the first heat exchanging part 51 and the second heat exchanging part 52, the first part 501, the second part 502, and the bending part 503 are integrally configured. Specifically, the first heat exchanging part 51 and the second heat exchanging part 52 perform an R-bending (L-bending) process on the heat exchanging part 50 configured in a substantially I shape so as to extend linearly in a plan view. As a result, the first part 501, the second part 502, and the bending part 503 are configured. That is, in each heat exchange unit 50, the end of the first part 501 opposite to the curved part 503 constitutes an end 511 or an end 521. In each heat exchanging part 50, the end of the second part 502 opposite to the curved part 503 constitutes an end part 512 or an end part 522.

  From a different viewpoint, each of the first part 501, the second part 502, and the bending part 503 in each heat exchange part 50 can be interpreted as an independent heat exchange part.

  Further, the end portion 512 is one end of the first heat exchanging portion 51 when viewed from the direction in which the heat transfer tubes 60 are arranged in the first heat exchanging portion 51 (in the heat transfer tube stacking direction) (here, in a plan view). This is a part including one end of the heat transfer tube 60 included in the first heat exchange unit 51. Further, the end portion 522 is one end of the second heat exchanging portion 52 when viewed from the direction in which the heat transfer tubes 60 are arranged in the second heat exchanging portion 52 (in the heat transfer tube stacking direction) (here, in plan view). This is a part including one end of the heat transfer tube 60 included in the second heat exchange part 52.

  The first heat exchange unit 51 and the second heat exchange unit 52 include a plurality of heat transfer tubes 60 through which the refrigerant flows and a refrigerant in the heat transfer tube 60 in each of the first part 501, the second part 502, and the bending part 503. It has a plurality of heat transfer fins 65 that promote heat exchange with the airflow AF.

(4-1-1) Heat transfer tube 60
The heat transfer tube 60 is a so-called flat multi-hole tube having a thin plate shape and having a plurality of refrigerant channels 61 formed therein. The heat transfer tube 60 is made of aluminum or aluminum alloy. The heat transfer tube 60 extends along the heat transfer tube extending direction (here, the horizontal direction). In the heat transfer tube 60, the refrigerant flow path 61 extends along the heat transfer tube extending direction. In addition, the heat transfer tube extending direction of the heat transfer tube 60 is a direction in which each portion (the first portion 501, the second portion 502, or the curved portion 503) of the heat exchange portion 50 including the heat transfer tube 60 extends (that is, x here). Direction or y direction).

  The heat transfer tubes 60 are arranged in the heat exchanging unit 50 together with other heat transfer tubes 60 at intervals along the heat transfer tube stacking direction (here, the z direction). Each heat transfer tube 60 is arranged in two rows at intervals along the air flow direction (here, the y direction or the x direction) with the other heat transfer tubes 60. That is, in the heat exchange section 50, a set of heat transfer tubes in which the heat transfer tubes 60 extending along the heat transfer tube extending direction are arranged in two rows along the air flow direction and arranged in two rows along the air flow direction. It arrange | positions so that 60 may be arranged in multiple numbers along a heat exchanger tube lamination direction. In addition, about the row | line | column and the number of the heat exchanger tubes 60 contained in the heat exchange part 50, it can change suitably according to design specifications.

  Here, among the heat transfer tubes 60 arranged in two rows, the heat transfer tube 60 positioned on the windward side of the air flow AF is referred to as a windward heat transfer tube 60a, and the heat transfer tube 60 positioned on the leeward side of the air flow AF is referred to as the leeward side. This is referred to as a side heat transfer tube 60b.

(4-1-2) Heat transfer fin 65
The heat transfer fins 65 are flat members that increase the heat transfer area between the heat transfer tubes 60 and the airflow AF. The heat transfer fins 65 are made of aluminum or aluminum alloy. The heat transfer fins 65 extend along the heat transfer tube stacking direction (z direction) so as to intersect the heat transfer tubes 60 in the heat exchange unit 50. In the heat transfer fin 65, a plurality of slits 62 are formed side by side along the heat transfer tube stacking direction, and the heat transfer tubes 60 are inserted into the slits 62 (see FIG. 8).

  The heat transfer fins 65 are arranged at intervals along the heat transfer tube extending direction together with the other heat transfer fins 65 in the heat exchange unit 50. The heat transfer fins 65 are arranged in two rows at intervals along the air flow direction (y direction or x direction) with the other heat transfer fins 65. That is, in the heat exchange section 50, the heat transfer fins 65 extending along the heat transfer tube stacking direction intersecting the heat transfer tube extending direction are arranged in two rows along the air flow direction, and two rows along the air flow direction. A set of heat transfer fins 65 arranged in a row is arranged so that a large number of heat transfer fins 65 are arranged along the heat transfer tube extending direction (see FIG. 7). The number of heat transfer fins 65 included in the heat exchange unit 50 is selected according to the length dimension of the heat transfer tube 60 in the heat transfer tube extending direction, and can be appropriately selected and changed according to the design specifications.

(4-2) Header collecting pipe 70
The indoor heat exchanger 21 includes a plurality (here, two) of gas header collecting pipes 72, a plurality (here, two) of liquid header collecting pipes 75, and a plurality (here, two) of header collecting pipes 70. And a folded header collecting pipe 78. Each header collecting pipe 70 has a cylindrical shape extending in the longitudinal direction (here, the z direction), and has a space (hereinafter referred to as “header space HS”) formed therein.

(4-2-1) Gas header collecting pipe 72
FIG. 9 is a schematic view schematically showing a connection mode between each gas header collecting pipe 72 or each liquid header collecting pipe 75 and the heat transfer pipe 60. The indoor heat exchanger 21 includes a first gas header collecting pipe 72 a and a second gas header collecting pipe 72 b as the gas header collecting pipe 72. The first gas header collecting pipe 72 a is arranged at the end 511 of the first heat exchanging part 51, and the second gas header collecting pipe 72 b is arranged at the end 521 of the second heat exchanging part 52.

  Each gas header collecting pipe 72 is connected to one end of each upwind heat transfer pipe 60 a included in the first part 501 of the corresponding heat exchanging part 50. Specifically, the first gas header collecting pipe 72 a is connected to one end of each upwind heat transfer pipe 60 a included in the first part 501 of the first heat exchanging part 51, and the second gas header collecting pipe 72 b is connected to the second heat exchanging part 52. It is connected to one end of each upwind heat transfer tube 60a included in the first portion 501.

  Each gas header collecting pipe 72 is connected to a gas communication pipe GP. More specifically, the gas communication pipe GP is branched into a first gas communication pipe GP1 and a second gas communication pipe GP2 in the indoor unit 20, and the first gas header collecting pipe 72a is connected to the first gas communication pipe GP1. The second gas header collecting pipe 72b is connected to the second gas communication pipe GP2.

  That is, the gas communication pipe GP is connected to the gas header collecting pipe 72 disposed at the end 511 of the first heat exchange part 51 and the end 521 of the second heat exchange part 52. In other words, it can be said that the gas communication pipe GP is individually connected to the end 511 of the first heat exchange unit 51 and the end 521 of the second heat exchange unit 52.

  By arranging the gas header collecting pipes 72 in such a manner, the refrigerant flow paths 61 in the windward heat transfer pipes 60a of the first heat exchanging part 51 are connected to the first gas header collecting pipes 72a (header space HS). Via the first gas communication pipe GP1. In addition, the refrigerant flow path 61 in each upwind heat transfer pipe 60a of the second heat exchange section 52 communicates with the second gas communication pipe GP2 via the second gas header collecting pipe 72b (header space HS).

(4-2-2) Liquid header collecting pipe 75
The indoor heat exchanger 21 includes a first liquid header collecting pipe 75a and a second liquid header collecting pipe 75b as the liquid header collecting pipe 75. The first liquid header collecting pipe 75 a is arranged at the end 511 of the first heat exchange part 51, and the second liquid header collecting pipe 75 b is arranged at the end 521 of the second heat exchange part 52.

  Each liquid header collecting pipe 75 is connected to one end of each leeward heat transfer pipe 60b included in the first part 501 of the corresponding heat exchanging part 50. Specifically, the first liquid header collecting pipe 75a is connected to one end of each leeward heat transfer pipe 60b included in the first part 501 of the first heat exchanging part 51, and the second liquid header collecting pipe 75b is a second heat exchanging part. 52 is connected to one end of each leeward side heat transfer tube 60b included in the first portion 501 of the second 501.

  Each liquid header collecting pipe 75 is connected to a liquid communication pipe LP. More specifically, the liquid communication pipe LP is branched into the first liquid communication pipe LP1 and the second liquid communication pipe LP2 in the indoor unit 20, and the first liquid header collecting pipe 75a is connected to the first liquid communication pipe LP1. The second liquid header collecting pipe 75b is connected to the second liquid communication pipe LP2.

  That is, the liquid communication pipe LP is connected to the liquid header collecting pipe 75 arranged at the end 511 of the first heat exchange unit 51 and the end 521 of the second heat exchange unit 52. In other words, it can be said that the liquid communication pipe LP is individually connected to the end 511 of the first heat exchange unit 51 and the end 521 of the second heat exchange unit 52.

  By arranging the liquid header collecting pipes 75 in such a manner, the refrigerant flow paths 61 in the leeward heat transfer pipes 60b of the first heat exchange unit 51 are connected to the first liquid header collecting pipes 75a (header space HS). ) To communicate with the first liquid communication pipe LP1. Further, the refrigerant flow path 61 in each leeward heat transfer pipe 60b of the second heat exchange section 52 communicates with the second liquid communication pipe LP2 via the second liquid header collecting pipe 75b (header space HS).

(4-2-3) Folded header collecting pipe 78
FIG. 10 is a schematic diagram schematically showing a connection mode between each folded header collecting pipe 78 and the heat transfer pipe 60. The indoor heat exchanger 21 includes a first folded header collecting pipe 78a and a second folded header collecting pipe 78b as the folded header collecting pipe 78. The first folded header collecting pipe 78a (corresponding to the “first header collecting pipe” in the claims) is arranged at the end 512 of the first heat exchanging portion 51, and the second folded header collecting pipe 78b (claims) (Corresponding to “second header collecting pipe”) is disposed at the end 522 of the second heat exchanging section 52.

  Each folded header collecting pipe 78 is connected to one end of each of the windward side heat transfer pipes 60a and each of the leeward side heat transfer pipes 60b included in the second part 502 of the corresponding heat exchanging part 50. Specifically, the first folded header collecting pipe 78a is connected to one end of each of the windward side heat transfer pipes 60a and each of the leeward side heat transfer pipes 60b included in the second part 502 of the first heat exchanging part 51. The second folded header collecting pipe 78b is connected to one end of each of the windward side heat transfer pipes 60a and each of the leeward side heat transfer pipes 60b included in the second part 502 of the second heat exchange part 52.

  Each folded header collecting pipe 78 is formed so that a plurality of header spaces HS (corresponding to “communication space” in the claims) are arranged in the heat transfer tube stacking direction. In each folded header collecting pipe 78, each header space HS is partitioned from other header spaces HS, and each header space HS is connected to each of the windward side heat transfer pipes 60a and leeward side heat transfer pipes 60b arranged on the same stage. It communicates with the refrigerant flow path 61. Thereby, the header space in the folded header collecting pipe 78 flows through the refrigerant flow path 61 in one of the heat transfer tubes 60 (that is, the windward side heat transfer tube 60a or the leeward side heat transfer tube 60b) arranged in the same stage (row). The refrigerant that has reached HS flows into the other heat transfer tube 60 and flows through the refrigerant flow path 61 in the heat transfer tube 60.

  That is, in the indoor heat exchanger 21, the refrigerant that has flowed into the first heat exchange unit 51 or the second heat exchange unit 52 from the gas communication pipe GP or the liquid communication pipe LP via the gas header collecting pipe 72 or the liquid header collecting pipe 75. First flows through the first part 501 (more specifically, one heat transfer tube 60 in the first part 501). Then, the refrigerant passes through the second portion 502 via the curved portion 503, and turns the flow direction in the header space HS in the folded header collecting pipe 78. Thereafter, the refrigerant again flows through the second part 502 (more specifically, the other heat transfer pipe 60 in the second part 502), passes through the first part 501 through the curved part 503, and passes through the gas header collecting pipe 72 or liquid. It flows out to the gas communication pipe GP or the liquid communication pipe LP through the header collecting pipe 75.

  By installing the folded header collecting pipe 78 in such a manner, an increase in refrigerant pressure loss at the end portion 512 and the end portion 522 is suppressed. That is, when the U-shaped tube connecting the windward side heat transfer tube 60a and the leeward side heat transfer tube 60b is installed at the end portion 512 and the end portion 522, the pressure loss may increase and the performance of the heat exchanger may decrease. In order to suppress such a situation, a folded header collecting pipe 78 in which a communication space (header space HS) for communicating the windward side heat transfer pipe 60a and the leeward side heat transfer pipe 60b is formed is provided.

(4-3) Shielding member 80
FIG. 11 is a perspective view of the indoor heat exchanger 21. FIG. 12 is an external view of the shielding member 80.

  The shielding member 80 is a member for shielding the gap between the heat exchange parts 50 from the air flow AF. Specifically, the shielding member 80 is disposed in a space SP2 (see FIG. 6) formed between the end portion 512 of the first heat exchange unit 51 and the end portion 522 of the second heat exchange unit 52. A gap formed between the end portion 512 and the end portion 522 is shielded against the airflow AF.

  The shielding member 80 includes a wind shielding surface 81, a first contact portion 82, a second contact portion 83, and a plurality of fixing portions 84. The shielding member 80 is manufactured by, for example, extrusion molding or machining. In the shielding member 80, the wind shielding surface 81, the first contact portion 82, the second contact portion 83, and each fixing portion 84 are integrally configured.

(4-3-1) Wind-shielding surface 81
The wind shielding surface 81 is a surface portion that expands in the space SP2, and plays a role of blocking the airflow AF. The wind shielding surface 81 includes a portion 512a (see FIG. 6) facing the upstream side (windward side) of the air flow AF at the end portion 512 (of the first heat exchange unit 51) and (of the second heat exchange unit 52). The end portion 522 continuously extends (spreads) between a portion 522a (see FIG. 6) facing the upstream side (windward side) of the air flow AF. The wind shielding surface 81 has a size capable of shielding a gap formed between the end portion 512 and the end portion 522 in the air flow direction (that is, an area capable of suppressing the air flow AF from passing through the space SP2). doing.

  The wind shielding surface 81 is a curved surface whose cross section is curved in an arc shape (in a state where the indoor heat exchanger 21 is assembled). More specifically, the wind shielding surface 81 is curved so as to swell from the windward side of the space SP2 to the leeward side.

(4-3-2) First contact portion 82
The first contact portion 82 is a member that contacts the heat transfer tube 60 of the first heat exchange portion 51. The first contact portion 82 is disposed at the end of the wind shield surface 81 on the first heat exchange portion 51 side.

  The first contact portion 82 is formed in a comb-like shape by forming a plurality of slits (hereinafter referred to as “first slit SL1”). In the first contact portion 82, the same number of first slits SL1 as the number of heat transfer tubes 60 included in the first heat exchange portion 51 are formed. Specifically, each first slit SL1 has a one-to-one correspondence with any one of the heat transfer tubes 60 included in the first heat exchange unit 51, and the corresponding heat transfer tube 60 is inserted therein.

  The first contact portion 82 contacts the heat transfer tube 60 of the first heat exchange portion 51 at the first edge portion 821 that is the periphery of the first slit SL1. Specifically, the first contact portion 82 contacts the outer surface of the heat transfer tube 60 inserted into the first slit SL1. The heat transfer tube 60 of the first heat exchanging part 51 inserted into the first slit SL1 is engaged with or fitted to the first edge part 821.

  The first contact portion 82 is brazed and joined to the heat transfer tube 60 that engages or fits with the first edge portion 821, and a brazing material is disposed on the first edge portion 821. That is, the shielding member 80 is brazed and joined to the first heat exchange unit 51 at the first contact portion 82.

  FIG. 13 is a schematic view showing a state in which the first contact portion 82 or the second contact portion 83 in a state where the heat transfer tube 60 is inserted into the slit, as viewed from the direction A in FIG. The first edge portion 821 of the first abutting portion 82 is subjected to burring and is provided with a flange 822 that extends along the direction in which the heat transfer tube 60 extends (here, the x direction or the y direction). As a result, when the heat transfer tube 60 is inserted into the first slit SL1, the heat transfer tube 60 is guided in the insertion direction by the flange 822, and the insertion is facilitated. Further, when the heat transfer tube 60 contacts the first edge portion 821, damage to the heat transfer tube 60 due to friction or collision is suppressed.

  The shielding member 80 including the first contact portion 82 is made of a material having a standard potential smaller than that of the heat transfer tube 60 of the first heat exchange portion 51. This is to suppress the corrosion of the heat transfer tube 60 of the first heat exchange unit 51 due to electrochemical corrosion (electrolytic corrosion).

(4-3-3) Second contact portion 83
The second contact portion 83 is a member that contacts the heat transfer tube 60 of the second heat exchange portion 52. The second contact portion 83 is disposed at the end of the wind shield surface 81 on the second heat exchange portion 52 side.

  The second contact portion 83 is formed in a comb shape by forming a plurality of slits (hereinafter referred to as “second slit SL2”). In the second contact portion 83, the same number of second slits SL2 as the number of the heat transfer tubes 60 included in the second heat exchange portion 52 are formed. Specifically, each second slit SL2 has a one-to-one correspondence with any one of the heat transfer tubes 60 included in the second heat exchange unit 52, and the corresponding heat transfer tube 60 is inserted therein.

  The second contact portion 83 contacts the heat transfer tube 60 of the second heat exchange portion 52 at the second edge portion 831 that is the peripheral edge of the second slit SL2. Specifically, the second contact portion 83 contacts the outer surface of the heat transfer tube 60 inserted into the second slit SL2. The heat transfer tube 60 of the second heat exchange unit 52 inserted into the second slit SL2 is engaged with or fitted to the second edge 831.

  The second contact portion 83 is brazed to the heat transfer tube 60 that engages or fits with the second edge portion 831, and a brazing material is disposed at the second edge portion 831. That is, the shielding member 80 is brazed and joined to the second heat exchange unit 52 at the second contact portion 83.

  The second edge portion 831 of the second contact portion 83 is subjected to burring and is provided with a flange 832 extending along the direction in which the heat transfer tube 60 extends (here, the x direction or the y direction) ( (See FIG. 13). As a result, when the heat transfer tube 60 is inserted into the second slit SL2, the heat transfer tube 60 is guided in the insertion direction by the flange 832 so that the insertion is facilitated. Further, when the heat transfer tube 60 comes into contact with the second edge portion 831, damage to the heat transfer tube 60 due to friction or collision is suppressed.

  The shielding member 80 including the second contact portion 83 is made of a material having a standard potential smaller than that of the heat transfer tube 60 of the second heat exchange portion 52. This is to prevent the heat transfer tube 60 of the second heat exchange unit 52 from being corroded by electrochemical corrosion (electric corrosion).

(4-3-4) Fixing portion 84
The fixing portion 84 is a member for fixing the shielding member 80 to the casing 30. In other words, the fixing portion 84 attaches each heat exchange portion 50 joined to the shielding member 80 and each header collecting pipe 70 joined to each heat exchange portion 50 (that is, the entire indoor heat exchanger 21) to the casing 30. It is a member for fixing.

  The shielding member 80 includes a first fixing portion 84 a and a second fixing portion 84 b as the fixing portion 84. The first fixing portion 84 a is disposed at the upper end of the wind shield surface 81 in the vicinity of the end portion on the first contact portion 82 side. The second fixing portion 84b is disposed at the upper end of the wind shield surface 81 in the vicinity of the end portion on the second contact portion 83 side.

  Each fixing portion 84 includes a flat portion 841 extending in a direction (horizontal direction) intersecting with the heat transfer tube stacking direction (here, z direction). Each fixing portion 84 is formed with a screw hole 842 in the flat portion 841. Each fixing portion 84 is screwed and fixed to the top plate 31a of the casing 30 through a screw hole 842 with screws (not shown). That is, the shielding member is fixed to the top plate 31 a (casing 30) at each fixing portion 84.

(5) Assembling method of the indoor heat exchanger 21 The indoor heat exchanger 21 is assembled by the following steps, for example. However, the following steps are merely examples, and can be changed as appropriate.

  First, the 1st process which assembles each heat exchange part 50 (the 1st heat exchange part 51 and the 2nd heat exchange part 52) combining the heat exchanger tube 60 and the heat transfer fin 65 is performed.

  After the completion of the first step, a second step of connecting the header collecting pipes 70 to the assembled heat exchange unit 50 and connecting the shielding member 80 is performed. In the second step, the corresponding heat transfer tubes 60 are inserted into the slits (SL1, SL2) of the first contact portion 82 and the second contact portion 83 of the shielding member 80. At this time, it is possible to combine the shielding member 80 and the heat exchange unit 50 while engaging or fitting the heat transfer tube 60 to the edge portions (the first edge portion 821 and the second edge portion 831). Thus, the positioning and fixing of the shielding member 80 is easy.

  After the completion of the second step, a third step is performed in which each part of the assembled indoor heat exchanger 21 is joined by brazing in the furnace.

  After completion of the third step, each heat exchanging portion 50 is deformed into an approximately L shape in plan view by performing an R-bending process on the curved portion 503 (that is, the first portion 501 in each heat exchanging portion 50, The fourth step (which constitutes the second part 502 and the bending part 503) is performed.

  FIG. 14 is a schematic diagram illustrating the fifth process performed in the indoor heat exchanger 21 in a state where the fourth process is completed in a plan view. As shown by the solid line portion in FIG. 14, in the indoor heat exchanger 21 in which the fourth step is completed, the wind shield surface 81 of the shield member 80 has a substantially straight shape (substantially I shape) in plan view. In this state, the fifth step of rotating one heat exchanging unit 50 by 90 degrees around the central portion of the wind shielding surface 81 is performed. In the fifth step, the wind shielding surface 81 is deformed so that the cross section has an arc shape.

  As shown in the two-dot chain line portion of FIG. 14, after completion of the fifth step, the wind shielding surface 81 is curved in an arc shape in plan view, and the end portions 511 and 521 of each heat exchange unit 50 are close to each other and the end portions. 512 and 522 will be in the state which adjoined, and the indoor heat exchanger 21 will exhibit square shape.

  Thereafter, the indoor heat exchanger 21 is installed at a predetermined position of the casing 30 and is fixed to the casing 30 by being screwed to the top plate 31a at the fixing portion 84.

  In the indoor heat exchanger 21 assembled in such a state and installed in the casing 30, when viewed from the leeward side of the airflow AF, the end 512, 522 of the heat exchange unit 50 is at the end. The heat transfer pipes 60 positioned between the heat transfer fins 65 positioned closest (that is, closest to the folded header collecting pipe 78) and the folded header collecting pipe 78 and the folded header collecting pipe 78 are shielded by the wind shielding surface 81. ing.

  As a result, the airflow AF is suppressed from passing through the space SP2. That is, in the indoor heat exchanger 21, it is suppressed that the refrigerant | coolant which is not heat-exchanging with a refrigerant | coolant is sent from the leeward side of the indoor heat exchanger 21 to the leeward side.

(6) Features (6-1)
In the indoor heat exchanger 21 according to the embodiment, the performance improvement of the heat exchanger is promoted.

  Conventionally, microchannel heat exchangers are superior in heat transfer performance in principle to cross-fin tube heat exchangers, and in recent years, the introduction of microchannel heat exchangers has been promoted in various refrigeration devices that perform refrigeration cycles. Yes. However, in the microchannel heat exchanger, since the cross-sectional area of each refrigerant flow path formed in the heat transfer tube (flat multi-hole tube) is narrow, it depends on the shape of the heat exchanger or the flow path length in the heat transfer tube. The pressure loss of the refrigerant in the heat transfer tube tends to be larger than that of the cross fin tube heat exchanger. In particular, when a microchannel heat exchanger is applied as a heat exchanger in a mode in which the heat transfer tube has one or more curved portions and is arranged so as to extend not only in one direction but also in one direction, the curved portion of the heat transfer tube There is a tendency that the pressure loss of the refrigerant in the heat transfer tube increases remarkably as the number of.

  For this reason, application of the microchannel heat exchanger is restricted depending on the shape of the heat exchanger. That is, improvement in the performance of the heat exchanger has been restricted.

  In this regard, in the indoor heat exchanger 21, the plurality of heat exchange units 50 include a first heat exchange unit 51 and a direction in which the first heat exchange unit 51 extends (in the vicinity of the first heat exchange unit 51). Includes a second heat exchanging portion 52 extending in a different direction, and an end portion 512 which is one end of the first heat exchanging portion 51 and an end portion 522 which is one end of the second heat exchanging portion 52 are arranged close to each other with a space therebetween. The liquid communication pipe LP and the gas communication pipe GP are individually connected to the end 511 (the other end) of the first heat exchange unit 51 and the end 521 (the other end) of the second heat exchange unit 52.

  Thereby, the heat exchanger (indoor heat exchanger 21) can be configured using the first heat exchange unit 51 and the second heat exchange unit 52 that are separated from each other. In other words, the indoor heat exchanger 21 is configured by combining the first heat exchange unit 51 and the second heat exchange unit 52 that are separated from each other. As a result, when a microchannel heat exchanger is applied as a heat exchanger (indoor heat exchanger) in a mode in which the heat transfer tubes are arranged so as to extend not only in one direction but also in a plurality of directions, the pressure loss in the heat transfer tube 60 It is possible to suppress the performance degradation due to.

  In particular, the indoor heat exchanger 21 has a substantially quadrangular shape so as to surround the indoor fan 22 in a plan view. When the viewpoint is changed, in the indoor heat exchanger 21, the heat transfer tubes 60 arranged on the same stage It includes four curved portions and extends in a substantially quadrangular shape in plan view (specifically, it extends in the x direction from one end and extends in the y direction, and also curves and extends in the x direction, and further curves and extends in the y direction). It is also possible to grasp that they are arranged so as to bend again and return to one end.

  In this respect, even in the heat exchanger of this aspect, each heat exchange unit is configured by combining the first heat exchange unit 51 and the second heat exchange unit 52 that are separated from each other as in the present embodiment. The number of curved portions of the heat transfer tube 60 at 50 is suppressed to the minimum necessary (one here). That is, even when a microchannel heat exchanger is applied as a heat exchanger in a mode in which the heat transfer tube has a plurality of curved portions and extends in a plurality of directions as well as in one direction, the pressure in the heat transfer tube 60 It is possible to suppress performance degradation due to loss.

  Further, in the indoor heat exchanger 21, the shielding member 80 is disposed in the gap between the first heat exchange part 51 and the second heat exchange part 52, and the airflow AF passes through the gap part (space SP <b> 2) by the wind shielding surface 81. Passing is suppressed. That is, air that has not passed through the heat exchanging unit 50 (that is, air that has not exchanged heat with the refrigerant in the heat transfer tube 60) is prevented from flowing from the windward side to the leeward side of the indoor heat exchanger 21. It has become. As a result, performance degradation of the heat exchanger when the heat exchanger (indoor heat exchanger 21) is configured using the first heat exchange unit 51 and the second heat exchange unit 52 that are separated from each other is suppressed.

  Therefore, the performance improvement of the heat exchanger is promoted.

(6-2)
In the indoor heat exchanger 21 according to the above-described embodiment, the wind shielding surface 81 is a curved surface whose cross section is curved in an arc shape. Thereby, the installation mode of the shielding member 80 can be flexibly selected according to the situation (for example, according to the direction in which the first heat exchange unit 51 or the second heat exchange unit 52 extends). That is, it is excellent in versatility and assemblability.

(6-3)
In the indoor heat exchanger 21 according to the embodiment, the shielding member 80 includes a fixing portion 84 that fixes the heat exchanging portion 50 to the casing 30 in which the heat exchanging portion 50 is accommodated. Thereby, the shielding member 80 can be made to function as a fixing member for fixing the heat exchange part 50 to the casing 30. That is, the shielding member 80 can have both a function as a wind shielding member and a function as a fixing member. As a result, the number of parts for the fixing member can be reduced, and the cost is suppressed.

(6-4)
In the indoor heat exchanger 21 according to the embodiment, the shielding member 80 is made of a material having a standard potential smaller than that of the heat transfer tube 60. Thereby, the electrolytic corrosion of the heat exchanger tube 60 is suppressed. Therefore, reliability and durability are improved.

(6-5)
In the indoor heat exchanger 21 according to the above-described embodiment, the wind shielding surface 81 includes a portion 512a facing the upstream side of the air flow AF at the end portion 512 and a portion 522a facing the upstream side of the air flow AF at the end portion 522. And continuously extending. Thereby, the space SP2 between the first heat exchange part 51 and the second heat exchange part 52 can be easily shielded against the airflow AF. Moreover, it becomes easy to connect the shielding member 80 to each heat exchange part 50, and the assemblability is improved.

(6-6)
In the indoor heat exchanger 21 according to the above embodiment, the shielding member 80 includes the first contact portion 82 disposed at the end of the wind shielding surface 81 on the first heat exchanging portion 51 side, and the first of the wind shielding surface 81. 2 and a second abutting portion 83 disposed at the end on the heat exchange portion 52 side. The first contact portion 82 is formed into a comb-teeth shape by forming a plurality of first slits SL1, and the heat transfer tube of the first heat exchange portion 51 at the edge (first edge portion 821) of the first slit SL1. 60 abuts. The second contact portion 83 is formed in a comb shape by forming a plurality of second slits SL2, and the heat transfer tube of the second heat exchange portion 52 at the edge (second edge portion 831) of the second slit SL2. 60 abuts.

  Thereby, it becomes easy to connect the shielding member 80 and the heat exchange part 50. That is, the slits SL1 and SL2 that are in contact with the heat transfer tubes 60 are formed in the shielding member 80, which facilitates positioning and fixing when installing the shielding member 80 between the heat exchange portions 50. Improved.

(6-7)
In the indoor heat exchanger 21 according to the embodiment, the first edge 821 or the second edge 831 is provided with flanges (822, 832) extending along the direction in which the heat transfer tube 60 extends. Thereby, when inserting the heat exchanger tube 60 in each slit (SL1, SL2), it is suppressed that the heat exchanger tube 60 is damaged by the friction and collision with the edge part (821, 831) of each slit. As a result, the performance decline of the heat exchanger resulting from the damage of the heat exchanger tube 60 is suppressed.

(6-8)
In the indoor heat exchanger 21 according to the embodiment, the shielding member 80 is brazed to the first heat exchange unit 51 and the second heat exchange unit 52, and is connected to the first edge 821 and the second edge 831. A brazing material is arranged. Thereby, the brazing property at the time of brazing and joining the shielding member 80 to the heat exchange part 50 is improved. That is, the assemblability is improved.

(6-9)
The indoor heat exchanger 21 according to the embodiment includes the first folded header collecting pipe 78a connected to the end portion 512, and the second folded header collecting pipe 78b connected to the end portion 522, and the first folded portion. In the header collecting pipe 78a and the second folded header collecting pipe 78b, a header space HS (communication space) that connects different heat transfer pipes 60 (refrigerant channels 61) installed in the same stage is formed.

  Thereby, the performance fall of the heat exchanger is suppressed. That is, when the U-shaped tube connecting the windward side heat transfer tube 60a and the leeward side heat transfer tube 60b is installed at the end portion 512 and the end portion 522, the pressure loss may increase and the performance of the heat exchanger may decrease. In order to suppress such a situation, a folded header collecting pipe 78 in which a communication space (header space HS) for communicating the windward side heat transfer pipe 60a and the leeward side heat transfer pipe 60b is formed is provided. Therefore, an increase in the pressure loss of the refrigerant at the end portion 512 and the end portion 522 is suppressed. Therefore, when the heat exchanger (indoor heat exchanger 21) is configured using the first heat exchange unit 51 and the second heat exchange unit 52 that are separated from each other, the performance deterioration of the heat exchanger is suppressed.

(7) Modifications The above embodiment can be appropriately modified as shown in the following modifications. Each modification may be applied in combination with another modification as long as no contradiction occurs.

(7-1) Modification A
In the said embodiment, the 1st heat exchange part 51 and the 2nd heat exchange part 52 included the 1st part 501, the 2nd part 502, and the curved part 503, and were comprised by planar view substantially L shape. However, the shape of each heat exchange part 50 in the indoor heat exchanger 21 is not necessarily limited to this, and can be changed as appropriate.

  For example, each heat exchange part 50 may be comprised by the substantially U shape in planar view, and may be comprised by the substantially V shape.

  For example, each heat exchange part 50 may be comprised by substantially I shape in planar view. In such a case, since the bending portion 503 is omitted in the heat exchanging portion 50, the bending portion of the heat transfer tube 60 becomes unnecessary. That is, even when a microchannel heat exchanger is applied as a heat exchanger in which the heat transfer tubes are arranged so as to extend not only in one direction but also in a plurality of directions, performance degradation due to pressure loss in the heat transfer tube 60 is particularly suppressed. It is possible to do.

  In the indoor heat exchanger 21, the heat exchange units 50 are not necessarily configured in the same shape, and may be configured in different shapes.

(7-2) Modification B
In the said embodiment, the case where the indoor heat exchanger 21 included the 1st heat exchange part 51 and the 2nd heat exchange part 52 as the heat exchange part 50 was demonstrated. That is, there are two indoor heat exchangers 21 (six when the first part 501, the second part 502, and the bending part 503 in each heat exchange part 50 are interpreted as independent heat exchange parts). The heat exchange part 50 was included. However, the number of heat exchange units 50 included in the indoor heat exchanger 21 is not particularly limited, and can be changed as appropriate according to design specifications.

  For example, the indoor heat exchanger 21 may be configured so as to surround the indoor fan 22 by combining four heat exchange portions 50 having a substantially I shape in plan view, as in the above embodiment. Moreover, the indoor heat exchanger 21 combines the two heat exchange parts 50 having a substantially I shape in a plan view and one heat exchange part 50 having a substantially L shape in a plan view, as in the above-described embodiment. 22 may be enclosed. In the indoor heat exchanger 21, the heat exchange units 50 do not necessarily have to be disposed so as to surround the indoor fan 22, but may be disposed as long as heat exchange between the air flow AF and the refrigerant is possible. Can be appropriately changed.

(7-3) Modification C
In the above embodiment, the shielding member 80 is a curved surface in which the cross section of the wind shield surface 81 is curved in an arc shape, and the wind shield surface 81 is curved so as to swell from the windward side to the leeward side in the space SP2. However, the shape of the wind shielding surface 81 can be changed as appropriate. For example, the wind shielding surface 81 may be curved so as to swell from the leeward side to the leeward side in the space SP2. Further, for example, the wind shielding surface 81 may be configured so that the cross section is linear (substantially I-shaped), or may be bent. That is, as long as the air flow AF can be suppressed in the space SP2, the shape of the wind shielding surface 81 can be appropriately changed.

(7-4) Modification D
In the above embodiment, the shielding member 80 includes a portion 512a (see FIG. 6) in which the wind shielding surface 81 faces the upstream side (windward side) of the air flow AF of the end portion 512 (of the first heat exchange unit 51). It was arrange | positioned so that it might extend continuously between the part 522a (refer FIG. 6) facing the upstream (windward side) of the airflow AF of the edge part 522 (of the 2nd heat exchange part 52). However, the present invention is not limited to this, and the arrangement mode of the shielding member 80 can be changed as appropriate.

  For example, as shown in FIG. 15, the shielding member 80 includes a portion 512 b (see FIG. 6) where the wind shielding surface 81 faces the downstream side (leeward side) of the air flow AF of the end portion 512, and the end portion 522. You may arrange | position so that it may extend continuously between the part 522b (refer FIG. 6) facing the downstream (leeward side) of the airflow AF.

  In addition, although illustration is omitted, the wind shielding surface 81 includes a portion facing one of the upstream side and the downstream side of the air flow AF of the end portion 512, and an upstream side and a downstream side of the air flow AF of the end portion 522. You may be comprised so that it may extend continuously between the part which faces the other among them.

(7-5) Modification E
In the said embodiment, the shielding member 80 contains the fixing | fixed part 84 which fixes the heat exchange part 50 with respect to the casing 30 in which the heat exchange part 50 is accommodated, and the fixing | fixed part 84 is screwed and fixed to the top plate 31a. It was. However, the aspect of fixing the fixing portion 84 to the casing 30 can be changed as appropriate.

  For example, the fixing portion 84 may be fixed to a portion other than the top plate 31a of the casing 30 (for example, the side plate 31b and the bottom plate 31c). Moreover, the fixing | fixed part 84 may be fixed to the casing 30 by methods (for example, welding etc.) other than screwing.

(7-6) Modification F
In the said embodiment, the 1st contact part 82 and the 2nd contact part 83 are shape | molded by the comb-tooth shape by forming a some slit (1st slit SL1 or 2nd slit SL2), and are set to each slit. Had a corresponding heat transfer tube 60 inserted. And in the 1st contact part 82 and the 2nd contact part 83, the heat exchanger tube 60 inserted in each slit was engaged or fitted to the 1st edge part 821 or the 2nd edge part 831.

  In the shielding member 80, the configuration of the first contact portion 82 and the second contact portion 83, and the contact mode of the first contact portion 82 and the second contact portion 83 with the heat transfer tube 60 are appropriately determined. It can be changed. For example, the shielding member 80 may be configured as a shielding member 80a illustrated in FIG.

  In the shielding member 80a shown in FIG. 16, three first contact portions 82a and three second contact portions 83b are provided. In the shielding member 80a, the first contact portion 82a is disposed at the upper end portion and the lower end portion of the wind shielding surface 81, and is also disposed at the intermediate portion between the upper end portion and the lower end portion. The first contact portion 82a disposed in the intermediate portion is smaller in size than the other first contact portions 82a.

  Further, in the shielding member 80a, the second contact portion 83a is disposed at the upper end portion and the lower end portion of the wind shielding surface 81, and is also disposed at the intermediate portion between the upper end portion and the lower end portion. The second contact portion 83a disposed in the intermediate portion is smaller in size than the other second contact portions 83a.

  The first contact portion 82a is a flat portion extending at the end of the wind shield surface 81 on the first heat exchanging portion 51 side so as to intersect the heat transfer tube extending direction of the second portion 502 (of the first heat exchanging portion 51). 90 is included. The second contact portion 83b is a flat portion extending at the end of the wind shield surface 81 on the second heat exchange portion 52 side so as to intersect the heat transfer tube extending direction of the second portion 502 (of the second heat exchange portion 52). 91 is included.

  The flat surface portion 90 is formed with a slit SL1 ′ that is associated with one of the heat transfer tubes 60 of the first heat exchange unit 51 and into which the corresponding heat transfer tube 60 is inserted. In addition, the flat surface portion 91 is formed with a slit SL2 ′ that is associated with one of the heat transfer tubes 60 of the second heat exchange unit 52 and into which the corresponding heat transfer tube 60 is inserted. That is, the number of slits formed in the shielding member 80 a is smaller than that in the shielding member 80.

  The shielding member 80a is configured such that the heat transfer tube 60 of the first heat exchange unit 51 inserted into the first slit SL1 ′ is engaged or fitted to the first edge 821 ′ that is the edge of the slit SL1 ′. Combined with the heat exchange unit 51. The shielding member 80a is brazed at the first abutting portion 82a and the heat transfer tube 60, which is engaged with or fitted to the first edge 821 ', with a brazing material disposed on the first edge 821'. .

  Further, the shielding member 80a is configured such that the heat transfer tube 60 of the second heat exchange unit 52 inserted into the second slit SL2 ′ is engaged or fitted into the second edge 831 ′ that is the edge of the slit SL2 ′. It is combined with the second heat exchange unit 52. The shielding member 80a is brazed at the second abutting portion 83a and the heat transfer tube 60, which is engaged with or fitted to the second edge 831 ', with a brazing material disposed at the second edge 831'. .

  Even if the shielding member 80a configured in this manner is replaced with the shielding member 80 in the indoor heat exchanger 21, the features (6-1) to (6-5) and (6-7) to (6) in the above embodiment are used. The effect described in -9) is exerted.

  In the shielding member 80a, a plurality of slits (SL1 ′ or SL2 ′) may be formed in the first contact portion 82a and the second contact portion 83a.

(7-7) Modification G
Further, the shielding member 80 may be configured as a shielding member 80b shown in FIG.

  In the shielding member 80b shown in FIG. 17, contact portions 95, 96, 97, and 98 are provided instead of the first contact portion 82a and the second contact portion 83a in the shield member 80a.

  The contact part 95 is disposed near the upper end of the end of the wind shielding surface 81 on the first heat exchanging part 51 side, and extends across the heat transfer tube extending direction of the second part 502 (of the first heat exchanging part 51). A flat portion 951 is included.

  The contact part 96 is disposed near the upper end of the end of the wind shield surface 81 on the second heat exchange part 52 side, and extends across the heat transfer tube extending direction of the second part 502 (of the second heat exchange part 52). A flat portion 961 is included.

  The contact portion 97 is disposed in the vicinity of the lower end of the end portion on the first heat exchange portion 51 side of the wind shielding surface 81. The contact portion 97 includes a flat portion 971 extending along the heat transfer tube extending direction of the second portion 502 (of the first heat exchanging portion 51), a flat portion 972 extending across the heat transfer tube extending direction, and a flat portion. And a flat portion 973 extending in the heat transfer tube stacking direction from 972.

  The abutting portion 98 is disposed in the vicinity of the lower end of the end of the wind shield surface 81 on the second heat exchange portion 52 side. The abutting portion 98 includes a flat portion 981 extending along the heat transfer tube extending direction of the second portion 502 (of the second heat exchanging portion 52), a flat portion 982 extending intersecting with the heat transfer tube extending direction, and a flat portion. And a flat surface portion 983 extending in the heat transfer tube stacking direction from 982.

  In the shielding member 80b, slits into which the heat transfer tubes 60 are inserted are not formed in the contact portions 95, 96, 97, and 98, and the flat plate portions are in contact with the heat exchange portions (51 and 52). It is configured.

  Specifically, the plane portion 951 abuts on the heat transfer tube 60 near the upper end of the end portion 512 of the first heat exchange unit 51 from above and engages with the heat transfer tube 60. Further, the flat portion 961 comes into contact with the heat transfer tube 60 near the upper end of the end portion 522 of the second heat exchange portion 52 from above and engages with the heat transfer tube 60.

  Further, the flat portion 971 abuts on a portion 512a (see FIG. 6) facing the windward side of the lower end portion of the end portion 512 of the first heat exchange portion 51, and the flat portion 972 abuts on the lower end portion of the end portion 512. The flat portion 973 contacts the portion 512b (see FIG. 6) facing the leeward side of the lower end portion of the end portion 512.

  Further, the flat surface portion 981 contacts the portion 522a (see FIG. 6) facing the windward side of the lower end portion of the end portion 522 of the second heat exchange portion 52, and the flat surface portion 982 contacts the lower end portion of the end portion 522. The flat portion 983 contacts the portion 522b (see FIG. 6) facing the leeward side of the lower end portion of the end portion 522.

  In the shielding member 80b, brazing material is disposed on each flat surface portion (951, 961, 971-973 and 981-983), and brazing is performed in a state where each flat surface portion is in contact with the heat exchanging portion 50. It is joined to the heat exchange unit 50.

  In the indoor heat exchanger 21, even if the shielding member 80b configured in this manner is replaced with the shielding member 80, the features (6-1) to (6-5) and (6-7) to (6) in the above embodiment ( The effects described in 6-9) are exhibited.

(7-8) Modification H
In the said embodiment, in the manufacturing process of the indoor heat exchanger 21, when each part contained in the indoor heat exchanger 21 is assembled and brazed in the furnace (that is, each part contained in the indoor heat exchanger 21 is The case of brazing together) has been described. However, it is not limited to this, The indoor heat exchanger 21 may be comprised by combining each part manufactured separately by performing brazing several times.

(7-9) Modification I
In the said embodiment, in the 5th process in the manufacturing process of the indoor heat exchanger 21, when the wind-shielding surface 81 is deform | transformed so that a cross section may exhibit circular arc shape (namely, the shielding member 80 is each heat exchange part 50). The case where the wind-shielding surface 81 is curved by being deformed in the joined state has been described.

  However, the shielding member 80 does not necessarily need to bend the wind shield surface 81 by being deformed in a state where it is joined to each heat exchanging portion 50, and the cross section of the wind shield surface 81 is curved in an arc shape. It may be molded. In such a case, in the assembly of the indoor heat exchanger 21 in the above embodiment, the heat exchanging parts 50 configured in a substantially L shape in plan view are arranged in a manner as shown in FIG. The shielding member 80 is assembled.

(7-10) Modification J
In the said embodiment, the shielding member 80 contains the fixing | fixed part 84 which fixes the heat exchange part 50 with respect to the casing 30 in which the heat exchange part 50 is accommodated, The function as a wind-shielding member and the function as a fixing member Had both. However, in the shielding member 80, the fixing portion 84 may be omitted (that is, the function as the fixing member is omitted) and only the function as the wind shielding member may be provided.

(7-11) Modification K
In the said embodiment, the shielding member 80 was comprised with the material whose standard potential is smaller than the heat exchanger tube 60 from a viewpoint of suppressing that the heat exchanger tube 60 corrodes by electric corrosion. However, the entire shielding member 80 does not need to be made of a material having a standard potential smaller than that of the heat transfer tube 60, and a portion that contacts the heat transfer tube 60 (for example, the first contact portion 82 or the second contact portion 83). What is necessary is just to be comprised with the material whose standard electric potential is smaller than the heat exchanger tube 60. FIG.

  Further, the shielding member 80 may be made of a material having a higher standard potential than that of the heat transfer tube 60 when electrical insulation from the heat transfer tube 60 is ensured (for example, when an insulating material is interposed).

(7-12) Modification L
In the above embodiment, the first edge 821 of the first abutting portion 82 and the second edge 831 of the second abutting portion 83 are subjected to burring so that the heat transfer tube 60 extends (here, the x direction). Or the flange (822,832) extended along the y direction) was provided. However, the first edge 821 and the second edge 831 of the second contact part 83 do not necessarily have to be provided with a flange, and the flange can be omitted as appropriate.

(7-13) Modification M
In the above embodiment, the shielding member 80 is brazed to the first heat exchange unit 51 and the second heat exchange unit 52, and the brazing material is disposed on the first edge 821 and the second edge 831. However, the shielding member 80 does not necessarily have to be provided with brazing material at the first edge 821 and the second edge 831, and brazing material is placed at other parts and brazed to each heat exchange unit 50. Also good.

  Moreover, the shielding member 80 may be joined to each heat exchange part 50 by methods other than brazing. For example, the shielding member 80 may be joined to each heat exchanging part 50 by being fixed by being screwed with a screw or the like, or joined to each heat exchanging part 50 by being adhered by an adhesive. May be.

  In addition, the shielding member 80 can block the airflow AF that passes through the space SP2 formed between the end portion 512 of the first heat exchanging portion 51 and the end portion 522 of the second heat exchanging portion 52. It is not always necessary to be joined to the first heat exchange unit 51 and the second heat exchange unit 52. For example, the shielding member 80 is configured such that the first abutting portion 82 and the second abutting portion 83 are in contact with the side surface of the heat transfer fin 65 and the contact is held by the elastic force of the wind shielding surface 81 that is a curved surface. You may arrange | position so that it may engage with each heat exchange part 50 in the aspect.

(7-14) Modification N
In the above embodiment, the shielding member 80 is disposed in the space SP2 (see FIG. 6) formed between the end portion 512 of the first heat exchange unit 51 and the end portion 522 of the second heat exchange unit 52. The gap formed between the end portion 512 and the end portion 522 is shielded against the airflow AF. In this regard, the shielding member 80 is disposed in a space SP1 (see FIG. 6) formed between the end 511 of the first heat exchange unit 51 and the end 521 of the second heat exchange unit 52, and ends. The gap formed between the part 511 and the end part 521 may be arranged to shield the airflow AF. In such a case, the air flow AF passing through the space SP1 (the gap formed between the end portion 511 and the end portion 521) without performing heat exchange with the refrigerant is blocked, so that the performance deterioration of the heat exchanger is further suppressed. The

(7-15) Modification O
In the above embodiment, the leeward heat transfer pipe 60 a is connected to the gas header collecting pipe 72, and the leeward heat transfer pipe 60 b is connected to the liquid header collecting pipe 75. However, the present invention is not limited to this, and the indoor heat exchanger 21 may be configured such that the leeward heat transfer pipe 60 a is connected to the liquid header collecting pipe 75 and the leeward heat transfer pipe 60 b is connected to the gas header collecting pipe 72. Good.

(7-16) Modification P
In the above embodiment, the air flow direction corresponds to the x direction (left-right direction) or the y direction (front-rear direction), the heat transfer tube extension direction corresponds to the y direction or the x direction intersecting the air flow direction, and the heat transfer tube stacking direction. The indoor heat exchanger 21 is configured so as to correspond to the z direction (vertical direction). However, the correspondence in each direction can be changed as appropriate according to the design specifications.

  For example, the indoor heat exchanger 21 may be configured such that the air flow direction or the heat transfer tube extending direction corresponds to the z direction (vertical direction). Moreover, the indoor heat exchanger 21 may be configured so that the heat transfer tube stacking direction corresponds to the x direction or the y direction.

(7-17) Modification Q
In the above embodiment, the gas communication pipe GP and the liquid communication pipe are connected to the end 511 of the first heat exchange part 51 and the end 521 of the second heat exchange part 52 via the gas header collecting pipe 72 and the liquid header collecting pipe 75. LPs were connected individually. However, the connection mode of the gas communication pipe GP and the liquid communication pipe LP at the end 511 of the first heat exchange unit 51 and the end 521 of the second heat exchange unit 52 is not necessarily limited to this, and can be changed as appropriate. It is. For example, the end 511 of the first heat exchange unit 51 and the end 521 of the second heat exchange unit 52 may be connected to the gas communication pipe GP and the liquid communication pipe LP via a flow divider.

(7-18) Modification R
In the said embodiment, in the heat exchange part 50, the windward side heat exchanger tube 60a and the leeward side heat exchanger tube 60b were contained. That is, the heat exchanging unit 50 is arranged so as to include a plurality of stages composed of two rows of heat transfer tubes 60. However, the arrangement of the heat transfer tubes 60 included in the heat exchange unit 50 can be changed as appropriate.

  For example, in the heat exchange unit 50, the heat transfer tube 60 may be arranged so as to have only one of the windward side heat transfer tube 60a and the leeward side heat transfer tube 60b. That is, in the heat exchange unit 50, one row of heat transfer tubes 60 may be arranged in a plurality of stages.

  For example, in the heat exchange part 50, the heat exchanger tube 60 may be arrange | positioned so that it may have the further heat exchanger tube 60 separately from the windward side heat exchanger tube 60a and the leeward side heat exchanger tube 60b. That is, the indoor heat exchanger 21 may be configured such that three or more rows of heat transfer tubes 60 are arranged in a plurality of stages in the heat exchange unit 50.

(7-19) Modification S
In the above embodiment, the heat transfer tube 60 is a flat multi-hole tube having a plurality of refrigerant channels 61 formed therein. However, the configuration of the heat transfer tube 60 can be changed as appropriate. For example, a flat tube in which one coolant channel is formed may be adopted as the heat transfer tube 60. A heat transfer tube having a shape other than a plate shape (heat transfer tube other than a flat tube) may be employed as the heat transfer tube 60.

(7-20) Modification T
In the said embodiment, the indoor heat exchanger 21 was applied to the ceiling embedded type indoor unit 20 installed in the ceiling back space CS of the object space. However, the type of the indoor unit to which the indoor heat exchanger 21 is applied is not particularly limited. For example, the indoor heat exchanger 21 includes a ceiling hanging type fixed to the ceiling surface C1 of the target space, a wall hanging type installed on the side wall, a floor standing type installed on the floor surface, and a floor installed on the floor. The present invention may be applied to an indoor unit such as an embedded type.

(7-21) Modification U
In the said embodiment, although this invention was applied to the indoor heat exchanger 21, it is not limited to this, You may apply to another heat exchanger. For example, the present invention may be applied to the outdoor heat exchanger 13. In such a case, the outdoor air flow generated by the outdoor fan 15 corresponds to the air flow AF in the above embodiment. In addition, the present invention may be applied as a heat exchanger for other refrigeration apparatuses other than an air conditioner (air conditioner) (for example, a water heater including a refrigerant circuit and a blower, an ice maker, a chiller, or a dehumidifier). .

(7-22) Modification V
In the above embodiment, the air conditioner 100 includes one outdoor unit 10 and one indoor unit 20. However, the number of outdoor units 10 and the number of indoor units 20 included in the air conditioner 100 can be changed as appropriate. That is, the air conditioning apparatus 100 may include two or more outdoor units 10 or may include two or more indoor units 20.

  The present invention is applicable to a heat exchanger.

20: Indoor unit 21: Indoor heat exchanger 22: Indoor fan 30: Casing 31a: Top plate 31b: Side plate 31c: Bottom plate 50: Heat exchange part 51: First heat exchange part 52: Second heat exchange part 60: Heat transfer tube 60a: Upstream heat transfer tube 60b: Downstream heat transfer tube 61: Refrigerant flow path 62: Slit 65: Heat transfer fin 70: Header collecting pipe 72: Gas header collecting pipe 72a: First gas header collecting pipe 72b: Second gas header collecting pipe 75 : Liquid header collecting pipe 75a: first liquid header collecting pipe 75b: second liquid header collecting pipe 78: folded header collecting pipe 78a: first folded header collecting pipe (first header collecting pipe)
78b: Second folded header collecting pipe (second header collecting pipe)
80, 80a, 80b: shielding member 81: wind shielding surfaces 82, 82a: first contact portions 83, 83a: second contact portions 84: fixing portion 84a: first fixing portion 84b: second fixing portion 95-98 : Contact part 100: air conditioner 501: first part 502: second part 503: curved part 512: end part (first end part)
522: End (second end)
821, 821 ': 1st edge part 822,832: Flange 831, 831': 2nd edge part 842: Screw hole AF: Air flow C1: Ceiling surface GP: Gas communication piping (gas refrigerant piping)
GP1: First gas communication pipe (gas refrigerant pipe)
GP2: Second gas communication pipe (gas refrigerant pipe)
HS: Header space LP: Liquid communication pipe (liquid refrigerant pipe)
LP1: First liquid communication pipe (liquid refrigerant pipe)
LP2: Second liquid connection pipe (liquid refrigerant pipe)
RC: refrigerant circuit SL1, SL1 ′: first slit SL2, SL2 ′: second slit

JP 2007-285604 A JP, 2015-127620, A

Claims (10)

A plurality of heat exchange sections (50) having a plurality of flat multi-hole tubes (60) and a plurality of heat transfer fins (65), and for exchanging heat between the air flow passing through and the refrigerant in the flat multi-hole tubes;
A shielding member (80) that shields the gap between the heat exchange portions from the air flow;
With
The plurality of heat exchange units include a first heat exchange unit (51) and a second heat exchange unit (52),
The first end (512), which is one end of the first heat exchange unit, and the second end (522), which is one end of the second heat exchange unit, are arranged close to each other with a space therebetween.
The second heat exchange part extends from the second end in a direction (y) different from the direction (x) in which the first heat exchange part extends from the first end,
Liquid refrigerant pipes (LP1, LP2) through which liquid refrigerant flows and gas refrigerant pipe (GP1) through which gas refrigerant flows are connected to the other end (511) of the first heat exchange section and the other end (521) of the second heat exchange section. , GP2) are connected individually,
The shielding member includes a wind shielding surface (81) disposed in a space (SP2) formed between the first end portion and the second end portion and blocking an air flow.
Heat exchanger (21). The wind-shielding surface is a curved surface whose cross section is curved in an arc shape.
The heat exchanger (21) according to claim 1. The shielding member further includes a fixing portion (84) for fixing the heat exchange portion to a casing (30) in which the heat exchange portion is accommodated.
The heat exchanger (21) according to claim 1 or 2. The shielding member is made of a material having a standard potential smaller than that of the flat multi-hole tube.
The heat exchanger (21) according to any one of claims 1 to 3. The wind-shielding surface is between a portion (512a) facing the upstream side of the air flow at the first end portion and a portion (522a) facing the upstream side of the air flow at the second end portion. Extending continuously at
The heat exchanger (21) according to any one of claims 1 to 4. The wind shield surface is between a portion (512b) facing the downstream side of the air flow at the first end portion and a portion (522b) facing the downstream side of the air flow at the second end portion. Extending continuously at
The heat exchanger (21) according to any one of claims 1 to 4. The shielding member is
A plurality of first slits (SL1, SL1 ′) are formed into a comb-teeth shape, and at the first edge (821, 821 ′) which is an edge of the first slit, A first contact portion (82, 82a) that contacts the flat multi-hole tube;
A plurality of second slits (SL2, SL2 ′) are formed into a comb-teeth shape, and the flatness of the second heat exchanging portion at the second edge portion (63) which is an edge of the second slit is formed. A second contact portion (83, 83b) that contacts the hole tube;
Further including
The first contact portion is disposed at an end portion of the wind shield surface on the first heat exchange portion side,
The second contact part is disposed at an end of the wind shield surface on the second heat exchange part side,
The heat exchanger (21) according to any one of claims 1 to 6. The first edge or the second edge is provided with flanges (822, 832) extending along the direction in which the flat multi-hole tube extends.
The heat exchanger (21) according to claim 7. The shielding member is brazed to the first heat exchange unit and / or the second heat exchange unit,
A brazing material is disposed on the first edge and / or the second edge;
A heat exchanger (21) according to claim 7 or 8. A first header collecting pipe (78a) connected to the first end;
A second header collecting pipe (78b) connected to the second end;
Further comprising
In the first header collecting pipe and the second header collecting pipe, a communication space (HS) that connects the refrigerant flow paths (61) in the different flat multi-hole pipes is formed.
A heat exchanger (21) according to any one of the preceding claims.

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