JP2017187243A - Indoor heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indoor heat exchanger capable of suppressing increase of draft resistance, and facilitating drainage of condensate water.SOLUTION: A first heat transfer fin 31 and a second heat transfer 32 have a windward side main part 33 in which cutout parts 35 inserting a first flat tube 21 and a second flat tube 22 are formed, and a leeward side communication part 34 positioned on the opposite side to an opening end of the cutout part 35. A first heat exchange part and a second heat exchange part are arranged side by side so that the first flat tube 21 and the second flat tube 22 of each stage are aligned in a width direction, and bent so that the windward side becomes an inner peripheral side and the leeward side becomes an outer peripheral side.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an indoor heat exchanger, and more particularly to an indoor heat exchanger used for heat exchange between indoor air and a refrigerant.

  Conventionally, as a heat exchanger for exchanging heat with indoor air in an indoor unit of an air conditioner, for example, a cross fin type heat exchange as described in Patent Document 1 (International Publication No. 08/41656 pamphlet). There is a vessel. In such a cross fin type heat exchanger, a dead water area is likely to occur on the leeward side of the cylindrical heat transfer tube penetrating the fin. Since the fin portion corresponding to the dead water area contributes less to heat exchange, it is necessary to provide three or more rows of heat transfer tubes in order to ensure the necessary heat exchange performance and increase the performance. Thus, the increase in the number of rows of 3 or more leads to an increase in the size of the heat exchanger. Further, since the airflow passing between the heat transfer tubes passes through the passage narrowed by the heat transfer tubes, the heat transfer tubes increase the ventilation resistance.

  In contrast to such a cross-fin type heat exchanger, for example, Patent Document 2 (International Publication No. 13/160957 pamphlet) describes a heat exchanger using a flat tube instead of a cylindrical heat transfer tube. Yes. In the heat exchanger using such a flat tube, the ventilation resistance is suppressed by using the flat tube.

  However, it is desired to increase the size of the heat exchanger such as multiple rows in order to improve the performance of the heat exchanger. Thus, when heat exchangers are arranged in a plurality of rows, there is a problem in that ventilation resistance increases due to deformation of the fins when the flat tube is bent. Further, since the flat tube becomes longer along the airflow direction of the indoor air than the circular tube, it is difficult to drain the condensed water generated in the indoor heat exchanger.

  The subject of this invention is providing the indoor heat exchanger by which the increase in ventilation resistance is suppressed and drainage of condensed water is easy.

  The indoor heat exchanger according to the first aspect of the present invention includes a plurality of first flat tubes arranged in a plurality of stages and a plurality of first heat transfer fins intersecting the first flat tubes, and flows in the width direction of the first flat tubes. A first heat exchange unit that exchanges heat between the indoor air and the refrigerant that flows in the first flat tube, and a plurality of second heat exchangers that intersect the second flat tube and the second flat tube arranged in a plurality of stages. A first heat transfer fin having a fin and a second heat exchanging part that exchanges heat between the indoor air flowing in the width direction of the second flat tube and the refrigerant flowing in the second flat tube And the second heat transfer fin include a windward main portion where a notch into which the first flat tube and the second flat tube are inserted is formed, and a leeward communication portion located on the opposite side of the opening end of the notch. The first heat exchange part and the second heat exchange part are juxtaposed so that the first flat tube and the second flat tube of each stage are aligned in the width direction, and the windward side The inner peripheral side, leeward side is bent so that the outer peripheral side.

  According to the indoor heat exchanger according to the first aspect of the present invention, the cutouts of the first heat transfer fin and the second heat transfer fin are arranged inside, and the first flat tube and the second flat tube are bent inward. Therefore, deformation of the main part of the first heat transfer fin and the main part of the second heat transfer fin is suppressed. Since the communicating portion of the first heat transfer fin and the second heat transfer fin is disposed on the leeward side, the condensed water carried by the indoor air flowing in the width direction of the first flat tube and the second flat tube is directed upward and downward. It can be made to flow through the communication part.

  The indoor heat exchanger according to the second aspect of the present invention is the indoor heat exchanger according to the first aspect, wherein the first heat exchange part and the second heat exchange part are bent so as to surround the indoor fan on the inner peripheral side, The indoor air blown out from the indoor fan disposed on the inner peripheral side is moved between the fins of the plurality of first heat transfer fins along the width direction of the first flat tube and the second flat tube. It arrange | positions so that derivation | leading-out can pass through between fins and the outer peripheral side with a communication part of a 2nd heat transfer fin.

  According to the indoor heat exchanger according to the second aspect of the present invention, the indoor air blown out from the indoor fan surrounded by the inner peripheral sides of the first heat exchanging part and the second heat exchanging part is converted into the first flatness having a small ventilation resistance. It can be made to blow in the width direction of a pipe and the 2nd flat tube, and condensed water can be conveyed over the whole indoor heat exchanger from the inner circumference side to the outer circumference side of the 1st heat exchange part and the 2nd heat exchange part.

  The indoor heat exchanger according to the third aspect of the present invention is the indoor heat exchanger according to the first aspect or the second aspect, wherein the plurality of first flat tubes are 0 mm from the windward edge of the plurality of first heat transfer fins. As described above, they are arranged on the windward side.

  According to the indoor heat exchanger according to the third aspect of the present invention, the first flat tube is located at the windward side of 0 mm or more from the windward edge of the plurality of first heat transfer fins, for example, the first heat exchange. The first flat tube protruding to the leeward side by 0 mm or more from the windward edge of the first heat transfer fin when the part and the second heat exchange part are bent hits the member etc. first, for example, the plurality of first heat transfer fins Upwind edge buckling is prevented.

  An indoor heat exchanger according to a fourth aspect of the present invention is the indoor heat exchanger according to the third aspect, wherein the plurality of first flat tubes and the plurality of second flat tubes are of the windward portion located on the windward side. The wall thickness of the tube wall is thicker than the wall thickness of the side wall portion located in the step direction of the first flat tube and the second flat tube.

  According to the indoor heat exchanger according to the fourth aspect of the present invention, since the tube wall of the windward portion located on the windward side is thick, it is deformed when the first flat tube and the second flat tube are bent. It becomes difficult.

  An indoor heat exchanger according to a fifth aspect of the present invention is the indoor heat exchanger according to any one of the first to fourth aspects, wherein the first heat exchange unit is a plurality of first heat transfer units of the first heat exchange unit. A gap is formed between the leeward edge of the fin and the main part on the windward side of the second heat transfer fin of the second heat exchanging part so as not to contact the second heat exchanging part.

  According to the indoor heat exchanger which concerns on the 5th viewpoint of this invention, it is comprised so that a 1st heat exchange part and a 2nd heat exchange part may not contact, and the 1st heat exchange part and 2nd with a temperature difference are comprised. It is possible to suppress heat conduction from one of the heat exchange units to the other.

  The indoor heat exchanger according to a sixth aspect of the present invention is the indoor heat exchanger according to the fifth aspect, wherein the second flat tube is located at an upstream of 0 mm or more from the windward edge of the plurality of second heat transfer fins. Are arranged.

  According to the indoor heat exchanger according to the sixth aspect of the present invention, the second flat tube is located on the windward side by 0 mm or more from the windward edge of the plurality of second heat transfer fins, It becomes easy to maintain the clearance gap between 2nd heat exchange parts.

  The indoor heat exchanger according to a seventh aspect of the present invention is the indoor heat exchanger according to the sixth aspect, wherein the second flat tube is located 2 mm or less above the windward edge of the plurality of second heat transfer fins. It is what is arranged.

  According to the indoor heat exchanger according to the seventh aspect of the present invention, the second flat tube is positioned on the windward side by 2 mm or less from the windward edge of the plurality of second heat transfer fins. Condensed water is attracted by the surface tension in a gap of 2 mm or less formed between the second heat exchange part and the second heat exchange part, so that it easily flows down.

  An indoor heat exchanger according to an eighth aspect of the present invention is the indoor heat exchanger according to any one of the fifth to seventh aspects, wherein the first heat exchanging section has gaps between the leeward edges of the plurality of first heat transfer fins. It extends in the vertical direction along a straight line.

  In the indoor heat exchanger according to the eighth aspect of the present invention, the leeward edges of the plurality of first heat transfer fins extend linearly along the gap in the vertical direction, so that the condensed water can be easily guided along the leeward edge.

  An indoor heat exchanger according to a ninth aspect of the present invention is the indoor heat exchanger according to any one of the fifth to eighth aspects, wherein the first heat exchange part and the second heat exchange part are the first flat tube and the first heat exchange part. 2 It is bent into an L shape, a C shape or a square shape when viewed from the step direction of the flat tube.

  According to the indoor heat exchanger pertaining to the ninth aspect of the present invention, the first heat exchange section and the second heat exchange section are bent into an L shape, a C shape, or a square shape. One pair or two pairs of the part and the second heat exchange part can surround the space on the windward side.

  In the indoor heat exchanger which concerns on the 1st viewpoint of this invention, the increase in ventilation resistance is suppressed and the drainage property at the time of dew condensation improves by the communicating part on the leeward side.

  In the indoor heat exchanger which concerns on the 2nd viewpoint of this invention, the airflow which an indoor fan blows around can be utilized efficiently, and the drainage property about condensed water can be improved.

  In the indoor heat exchanger which concerns on the 3rd viewpoint of this invention, the increase in the ventilation resistance by deformation | transformation of the windward edge of a some 1st heat-transfer fin can be suppressed.

  In the indoor heat exchanger which concerns on the 4th viewpoint of this invention, it can suppress that the pressure | voltage resistant strength of a 1st flat tube and a 2nd flat tube falls in the part bent to the inner peripheral side.

  In the indoor heat exchanger which concerns on the 5th viewpoint of this invention, it can suppress that the performance of heat exchange falls by the heat conduction between a 1st heat exchange part and a 2nd heat exchange part.

  In the indoor heat exchanger which concerns on the 6th viewpoint of this invention, it prevents that the performance of a 1st heat exchange part and a 2nd heat exchange part falls by the heat conduction between a 1st heat exchange part and a 2nd heat exchange part. It becomes easy.

  In the indoor heat exchanger according to the seventh aspect of the present invention, the drainage performance of the condensed water is improved.

  In the indoor heat exchanger which concerns on the 8th viewpoint of this invention, it can suppress that the malfunction by condensed water, such as a condensed water splashing, arises.

  In the indoor heat exchanger according to the ninth aspect of the present invention, the configuration of the apparatus to which the indoor heat exchanger is applied can be simplified.

The perspective view which shows the external appearance of the indoor unit which concerns on embodiment. Sectional drawing of the indoor unit of FIG. The typical top view of an indoor heat exchanger. Sectional drawing which shows the indoor heat exchanger of the place of the II line | wire of FIG. 3, and its surrounding structure. The schematic diagram when the indoor heat exchanger which functions as an evaporator is seen from the top. The partial expanded sectional view which shows an example of the relationship between a 1st flat tube, a 2nd flat tube, and a notch. The schematic diagram which shows an example of the manufacturing process of an indoor heat exchanger. The schematic diagram which shows an example of the other manufacturing process of an indoor heat exchanger. Sectional drawing which shows typically the relationship between the component of an indoor heat exchanger, and a jig | tool. Sectional drawing for demonstrating the wall thickness of the tube wall of a 1st flat tube and a 2nd flat tube. The partial expanded sectional view of the 1st heat exchange part and the 2nd heat exchange part. The schematic diagram when the indoor heat exchanger which concerns on modification 1A is seen from the top. The schematic diagram when the other indoor heat exchanger which concerns on modification 1A is seen from the top. The figure which shows an internal structure when the indoor unit which concerns on the modification 1B is seen from the bottom. Sectional drawing of the indoor unit cut | disconnected by the II-II line | wire of FIG.

(1) Outline of Configuration of Air Conditioner FIG. 1 shows an appearance of an indoor unit to which an indoor heat exchanger according to an embodiment of the present invention is applied, and FIG. 2 shows the indoor unit of FIG. The internal structure is shown. The indoor unit 100 is a ceiling-mounted indoor unit that is used for cooling and heating a room in a building such as a building by performing a vapor compression refrigeration cycle operation. As shown in FIG. 2, the indoor unit 100 is embedded in a ceiling CE of a room such as a building. The indoor unit 100 includes an indoor fan 120 and an indoor heat exchanger 10. When the indoor fan 120 is driven, the indoor unit 100 sucks indoor air from the suction port 101 in the lower center of the indoor unit 100 and blows out air from the four outlets 102 of the indoor unit 100. The four outlets 102 of the indoor unit 100 extend in parallel to the four sides of the decorative plate 103 having a substantially square bottom surface.

  Inside the indoor unit 100, a bell mouth 104 is attached immediately above the suction port 101. The indoor air sucked from the suction port 101 is guided to the indoor fan 120 by the bell mouth 104. From the indoor fan 120, room air is blown out substantially parallel to the ceiling CE. Then, the indoor air that passes through the indoor heat exchanger 10 that surrounds the indoor fan 120 in the horizontal direction and is blown out from the indoor fan 120 is blown out from the four outlets 102 on the outer periphery of the indoor heat exchanger 10. The

  In the indoor heat exchanger 10, for example, condensation may occur when the temperature of the indoor heat exchanger 10 is lower than the indoor temperature during cooling operation. In the indoor unit 100, a drain pan 130 is provided below the indoor heat exchanger 10 in order to receive condensed water generated by condensation in the indoor heat exchanger 10. The condensed water generated in the indoor heat exchanger 10 is attracted by gravity, flows downward through the indoor heat exchanger 10, and falls from the indoor heat exchanger 10 to the drain pan 130.

(2) Indoor heat exchanger 10
The state which looked at the indoor heat exchanger 10 from the top is shown by FIG. As illustrated in FIG. 3, the indoor heat exchanger 10 surrounds the indoor fan 120. The arrows Ar1, Ar2, Ar3, Ar4 in FIG. 3 indicate the direction of air flow. Moreover, the four blower outlets 102 are formed in the direction which these arrows Ar1-Ar4 faces. The indoor heat exchanger 10 has a shape along each side of a square having a center of a diagonal line at the center of the indoor fan 120 as viewed from above. However, the location corresponding to the location where the drain pump 140 is formed is recessed on the inner peripheral side.

  The indoor heat exchanger 10 is, for example, a part of a refrigerant circuit (not shown) that performs a refrigeration cycle, and is a device that exchanges heat between refrigerant flowing through the refrigerant circuit and room air. A liquid pipe 51 and a gas pipe 52 extending from the indoor heat exchanger 10 are connected to the refrigerant circuit. A liquid refrigerant mainly flows through the liquid pipe 51 extending from the indoor heat exchanger 10, and a gas refrigerant mainly flows through the gas pipe 52.

(2-1) 1st heat exchange part 11 and 2nd heat exchange part 12
FIG. 4 shows an enlarged cross-sectional structure of a part of the indoor unit 100 cut at a location corresponding to the location of line II in FIG. As shown in FIG. 4, the indoor heat exchanger 10 includes a first heat exchange unit 11 on the inner peripheral side and a second heat exchange unit 12 on the outer peripheral side. In other words, the first heat exchange unit 11 is disposed on the leeward side, and the second heat exchange unit 12 is disposed on the leeward side. The first heat exchange unit 11 includes a plurality of first flat tubes 21 arranged in a plurality of stages and a plurality of first heat transfer fins 31 intersecting with the plurality of first flat tubes 21. The first flat tube 21 and the first heat transfer fin 31 are substantially orthogonal to each other. Although the number of the first heat transfer fins 31 shown in FIG. 4 is only one, the other first heat transfer fins 31 adjacent to the first heat transfer fins 31 shown in FIG. The first heat transfer fins 31 are arranged in parallel. However, the first heat transfer fins 31 adjacent to each other at the bent portion 10R of the indoor heat exchanger 10 are not parallel to each other, and the outer periphery is closer to the inner peripheral side interval between the first heat transfer fins 31 adjacent to each other. The side spacing is widened. In one first flat tube 21, a plurality of flow paths 21a are formed in a line from the windward side to the leeward side, and the refrigerant flows through each flow path 21a.

  The second heat exchange unit 12 includes a plurality of second flat tubes 22 arranged in a plurality of stages and a plurality of second heat transfer fins 32 intersecting with the plurality of second flat tubes 22. The second flat tube 22 and the second heat transfer fin 32 are substantially orthogonal to each other. Although the number of the second heat transfer fins 32 shown in FIG. 4 is only one, the other second heat transfer fins 32 adjacent to the second heat transfer fins 32 shown in FIG. The second heat transfer fins 32 are arranged in parallel. However, the second heat transfer fins 32 adjacent to each other at the bent portion 10 </ b> R of the indoor heat exchanger 10 are not parallel to each other, and the outer periphery is larger than the interval on the inner peripheral side of the adjacent second heat transfer fins 32. The side spacing is widened. In one second flat tube 22, a plurality of flow paths 22a are formed in a line from the windward side to the leeward side, and the refrigerant flows through each flow path 22a.

  FIG. 5 schematically shows an example of the flow direction of the refrigerant flowing through the indoor heat exchanger 10. The indoor heat exchanger 10 includes a flow divider 53 connected to the liquid pipe 51, a liquid header 54 connected to the flow divider 53, a gas header 55 connected to the gas pipe 52, and a turn-up header 56. . The indoor heat exchanger 10 shown in FIGS. 3 and 5 is configured by using two sets of first heat exchange units 11 and second heat exchange units 12. The one arranged near the drain pump 140 is called the first heat exchange unit 11 and the second heat exchange unit 12 or the first pair P1 of the first pair P1, and the remaining one is the first heat of the second pair P2. It is called the exchange unit 11 and the second heat exchange unit 12 or the second pair P2.

  In FIG. 5, the flow of the refrigerant when the indoor heat exchanger 10 functions as an evaporator is indicated by arrows Ar5 to Ar8. In the first pair P1, the liquid refrigerant that has flowed from the liquid pipe 51 into the first flat tube 21 via the flow divider 53 and the liquid header 54 flows in the direction of the arrow Ar5. Then, the refrigerant flowing through the first flat pipe 21 of the first pair P1 enters the second flat pipe 22 from the first flat pipe 21 at the turn-back header 56, flows in the direction of the arrow Ar6, and passes through the gas header 55 to the gas pipe. It flows to 52. In the second pair P2, the liquid refrigerant that has flowed from the liquid pipe 51 into the first flat tube 21 via the flow divider 53 and the liquid header 54 flows in the direction of the arrow Ar7. Then, the refrigerant flowing through the first flat tube 21 of the second pair P2 enters the second flat tube 22 from the first flat tube 21 at the turn-up header 56, flows in the direction of the arrow Ar8, and passes through the gas header 55 to the gas pipe. It flows to 52. As described above, in the indoor heat exchanger 10 shown in FIG. 5, the liquid refrigerant evaporates while flowing through the first flat tube 21 and the second flat tube 22 and changes to a gas refrigerant. The indoor heat exchanger 10 shown in FIG. 5 includes a first heat exchange unit 11 and a second heat exchange unit 12 of a first pair P1 bent into an L shape, and a second pair P2 bent into an L shape. The first heat exchange unit 11 and the second heat exchange unit 12 are combined. Note that the first pair P1 has two bent portions 10R, and the second pair P2 has only one bent portion 10R, but both shapes are classified as L-shaped.

  As described above, the first pair P1 and the second pair P2 are bent in an L shape so that the first heat exchange unit 11 and the second heat exchange unit 12 surround the indoor fan 120 on the inner peripheral side. To be able to do that. In both the first pair P 1 and the second pair P 2, the indoor air blown from the indoor fan 120 arranged on the inner peripheral side is passed through the first flat tube 21 and the second flat tube 22 along the width direction. It arrange | positions so that it can guide | lead to the outer peripheral side with the communication part 34 (refer FIG. 6) of the 2nd heat transfer fin 32 through between the fins of the 2nd heat transfer fin 32 from between the fins of the 1 heat transfer fin 31. .

(2-2) Detailed Configuration of First Heat Transfer Fin 31 FIG. 6 shows the first heat transfer fin 31 of the first heat exchange unit 11 shown in FIG. 4 and a part of the first flat tube 21 fitted therein. It is shown further enlarged. Note that the structure of the first heat exchange unit 11 shown enlarged in FIG. 6 is also common to the second heat exchange unit 12, and therefore, the first heat exchange unit 11 will be described here and the second heat exchange unit 11 will be described. The description of the same configuration as the first heat exchange unit 11 in the exchange unit 12 is omitted.

  The first heat transfer fin 31 includes a windward main part 33 in which a notch 35 into which the first flat tube 21 is inserted is formed, and a leeward communication part 34 located on the opposite side of the opening end 35 a of the notch 35. Have. The first flat tube 21 is inserted in the direction of the arrow Ar9 in FIG. Similarly, the second heat transfer fin 32 is connected to the leeward side main portion 33 in which the notch 35 into which the second flat tube 22 is inserted and the leeward side communication located on the opposite side of the opening end 35a of the notch 35. Part 34 is provided. The communication portion 34 is formed with water guiding ribs 36 that help drain the condensed water. The water guide ribs 36 are portions extending from the pressed grooves. When the water guide ribs 36 are viewed from the one main surface f1 of the first heat transfer fins 31 (or the second heat transfer fins 32), the convex structure has the water guide ribs 36. When viewed from the other main surface on the opposite side of the one main surface f1, the concave structure extends vertically along the water guiding rib 36. A plurality of cut-and-raised portions 37 protruding in a bridge shape are formed on the one main surface f1 side of the first heat transfer fin 31 (or the second heat transfer fin 32). As can be seen from FIG. 6, the cut-and-raised portion 37 is not formed around the notch 35.

(3) Bending process of components of indoor heat exchanger 10 (3-1) Outline of bending process Using FIGS. 7, 8 and 9, the indoor heat exchanger 10 shown in FIG. 3 is bent. A method for forming the portion 10R will be described. In order to form the bent portion 10R, for example, two jigs shown in FIGS. 7 and 8 are used. That is, the bent portion 10 </ b> R of the indoor heat exchanger 10 is formed using the roll jig 210 and the pressing jig 220. As shown in FIG. 7, the roll jig 210 is fixed to the one end 301 side of the component 300 of the indoor heat exchanger 10 by placing it on the place where the bent portion 10 </ b> R is to be formed. Then, the pressing jig 220 is pressed against the component 300 from the side opposite to the roll portion 211 of the roll jig 210. Further, the pressing jig 220 presses the portion closer to the other end 302 of the component 300 than the roll portion 211.

  Next, as shown in FIG. 8, a force is applied to the component 300 of the indoor heat exchanger 10 from the pressing jig 220 to bend the first flat tube 21 and the second flat tube 22 of the component 300. At the place where the bent portion 10 </ b> R is formed, the radius of curvature of the second flat tube 22 is larger than the radius of curvature of the first flat tube 21. Accordingly, when the bending process is completed, the end of the first flat tube 21 and the end of the second flat tube 22 at the other end 302 of the component 300 are shown in FIG. As described above, the end of the second flat tube 22 is designed to protrude beyond the end of the first flat tube 21 before the component 300 is bent.

  FIG. 9 shows an enlarged view of the part 300 on which the roll jig 210 and the pressing jig 220 are pressed. As can be seen from FIG. 9, the first flat tube 21 mainly contacts the roll jig 210. Although not shown in FIG. 9, a plate is inserted between the first heat exchange unit 11 and the second heat exchange unit 12 during the bending process when completed. . In other words, during the bending process, the second flat tube 22 transmits the force from the second flat tube 22 to the first heat transfer fins 31 through the plate. Similarly, the area where the pressing jig 220 contacts the second heat transfer fin 32 also has a wide area. Then, the pressure received by the second heat transfer fin 32 from the pressing jig 220 and the pressure received by the first heat transfer fin 31 from the plate are smaller than the pressure received by the first flat tube 21 from the roll jig 210. As a result, buckling of the leeward edge 31b of the first heat transfer fin 31 and the leeward edge 32b (see FIG. 11) of the second heat transfer fin 32 during bending is prevented.

(3-2) Positional relationship between flat tubes and heat transfer fins As shown in FIG. 6, the plurality of first flat tubes 21 are 0 mm from the windward edges 31 a of the plurality of first heat transfer fins 31. As described above, they are arranged on the windward side. That is, the distance D1 between the windward end of the first flat tube 21 and the windward edge 31a of the first heat transfer fin 31 shown in FIG. 6 is 0 mm or more, and there is a manufacturing error, for example. Considering this, the distance D1 is preferably set to 0.5 mm or more. As already described, in order to reduce the force applied to the first heat transfer fins 31 during bending, it is preferable that the first flat tube 21 protrudes.

  Further, during bending, a force is applied to the first flat tube 21 from the roll jig 210, and a force is applied to the second flat tube 22 from a plate sandwiched between the first flat tube 21 and the second flat tube 22. . The wall thickness of the tube wall of the 1st flat tube 21 and the 2nd flat tube 22 is set in consideration of the force which these apply. Specifically, as shown in FIG. 10, the first flat tube 21 and the second flat tube 22 have the wall thickness t3 of the tube walls 21d and 22d in the windward portion located on the windward side. It is thicker than the wall thickness t <b> 2 of the tube walls 21 c and 22 c at the side portions located in the step direction of the flat tube 21 and the second flat tube 22. Note that the wall thickness t3 of the tube walls 21d and 22d in the windward portion located on the windward side than the wall thickness t1 of the inner walls 21b and 22b that separate the flow paths of the first flat tube 21 and the second flat tube 22 having multiple holes Is thicker.

  FIG. 11 shows a part of the first heat exchange unit 11 and the second heat exchange unit 12 in an enlarged manner. The first heat exchanging portion 11 has a gap CL formed between the leeward edge 31b of the first heat transfer fin 31 and the main portion 33 on the upwind side of the second heat transfer fin 32 of the second heat exchange portion 12. 2. It is comprised so that it may not contact with the heat exchange part 12. FIG. More specifically, in the first heat exchange unit 11, the leeward edges 31b of the plurality of first heat transfer fins 31 extend linearly in the vertical direction along the gap CL. The distance D3 between the leeward edge 31b of the first heat transfer fin 31 and the windward edge 32a of the second heat transfer fin 32 is preferably ensured by 2 mm or less.

  In addition, as shown in FIG. 6, the plurality of second flat tubes 22 are arranged to be located 0 mm or more on the windward side of the windward edges 32 a of the plurality of second heat transfer fins 32. That is, the distance D2 between the windward end of the second flat tube 22 and the windward edge 32a of the second heat transfer fin 32 shown in FIG. 6 is 0 mm or more, and the condensed water has surface tension. Is preferably set to 2 mm or less in order to make it easy to flow down. This 2 mm takes into account the size of the water droplets. If this is 2 mm or more, the water droplets are hardly attracted by surface tension (capillary phenomenon). Further, in order to reduce the force applied to the second heat transfer fins 32 during bending, the second flat tubes 22 are projected (the second flat tubes 22 are windward of the second heat transfer fins 32). It is preferable that the edge 32a protrudes more than 0 mm and is located on the windward side.

(4) Modification (4-1) Modification 1A
In the above embodiment, the indoor heat exchanger 10 combines the first pair P1 and the second pair bent in an L shape when viewed from the step direction of the first flat tube 21 and the second flat tube 22, The case where it is configured to surround the entire circumference of the windward space where the fan 120 is arranged has been described as an example. However, the shape of the indoor heat exchanger 10 for enclosing the windward space where the indoor fan 120 is disposed is, for example, as shown in FIG. 12 or FIG. 12 when viewed from the step direction of the first flat tube 21 and the second flat tube 22. It may be a square shape as shown in FIG.

  In FIG. 12, the flow of the refrigerant when the square indoor heat exchanger 10 functions as an evaporator is indicated by arrows Ar11 and Ar12. The liquid refrigerant that has flowed from the liquid pipe 51 into the first flat tube 21 via the flow divider 53 and the liquid header 54 flows in the direction of the arrow Ar11. The refrigerant flowing through the first flat tube 21 enters the second flat tube 22 from the first flat tube 21 at the folding header 56, flows in the direction of the arrow Ar 12, and flows to the gas pipe 52 via the gas header 55.

FIG. 13 shows the flow of the refrigerant when the square indoor heat exchanger 10 functions as an evaporator. The refrigerant flows in the first flat tube 21 of the first heat exchange unit 11 with arrows Ar12 and Ar14 and second heat exchange. The second flat tube 22 of the portion 12 is indicated by arrows Ar13 and Ar15. The liquid refrigerant flowing from the liquid pipe 51 into the first flat tube 21 via the flow divider 53 and the liquid header 54 is indicated by the arrows Ar12. It flows in the direction of Ar13. The refrigerant flowing through the first flat tube 21 flows in the directions of arrows Ar14 and Ar15, and flows to the gas pipe 52 via the gas header 55. At the position indicated by the arrows Ar12 and Ar14 (4-2) Modification 1B
Although the said embodiment demonstrated the case where the indoor heat exchanger 10 encloses the perimeter of the indoor fan 120, the structure which a part of circumference | surroundings of an indoor fan is not enclosed may be sufficient. When viewed from the step direction of the first flat tube 21 and the second flat tube 22, for example, a C shape as shown in FIGS. 14 and 15 may be used.

  FIG. 14 shows the internal structure of the indoor unit 100 as viewed from below, and FIG. 15 shows a cross-sectional structure taken along line II-II in FIG. The indoor unit 100 includes an indoor fan 120 and an indoor heat exchanger 10. The C-shaped indoor heat exchanger 10 is a portion indicated by hatching. When the indoor fan 120 is driven, the indoor unit 100 sucks room air from the suction port 101 in the lower center of the indoor unit 100 and blows air from the outlet 102 of the indoor unit 100.

  Inside the indoor unit 100, a bell mouth 104 is attached immediately above the suction port 101. The indoor air sucked from the suction port 101 is guided to the indoor fan 120 by the bell mouth 104. The indoor fan 120 substantially blows out indoor air in the horizontal direction. And the indoor air which passed the indoor heat exchanger 10 which encloses the indoor fan 120 in a C shape in a horizontal direction, and was blown off from the indoor fan 120 is blown off from the blower outlet 102.

  In the indoor heat exchanger 10, for example, condensation may occur when the temperature of the indoor heat exchanger 10 is lower than the indoor temperature during cooling operation. In the indoor unit 100, a drain pan 130 is provided below the indoor heat exchanger 10 in order to receive condensed water generated in the indoor heat exchanger 10. The condensed water generated in the indoor heat exchanger 10 is attracted by gravity, flows downward through the indoor heat exchanger 10, and falls from the indoor heat exchanger 10 to the drain pan 130.

(4-3) Modification 1C
The refrigerant flowing through the first flat tube 21 and the second flat tube 22 of the above embodiment may be other than a vapor compressor type refrigerant, for example, water.

(4-4) Modification 1D
In the indoor heat exchanger 10 of the present embodiment, the heat exchange unit has two rows of the first heat exchange unit 11 and the second heat exchange unit 12, but the present invention can also be applied to an indoor heat exchanger having three or more rows.

(4-5) Modification 1E
The indoor heat exchanger according to the present invention can be applied not only to the ceiling-embedded indoor unit 100 but also to, for example, a ceiling-suspended indoor unit.

(4-6) Modification 1F
In the said embodiment, although the 1st flat tube 21 and the 2nd flat tube 22 are arranged side by side at the same height, arrangement | positioning of the 1st flat tube and the 2nd flat tube of the indoor heat exchanger which concerns on this invention is the arrangement | positioning. A staggered arrangement may also be used.

(5) Features (5-1)
As described above, the notches 35 of the first heat transfer fins 31 and the second heat transfer fins 32 are arranged on the inner side, and the first flat tube 21 and the second flat tube 22 are bent inward. Deformation of the main portion 33 of the first heat transfer fin 31 and the main portion 33 of the second heat transfer fin 32 is suppressed. The deformation of the main portion 33 of the first heat transfer fin 31 and the main portion 33 of the second heat transfer fin 32 is suppressed, and the ventilation resistance is not increased by the deformation, and the increase of the ventilation resistance is suppressed.

  Moreover, since the communication part 34 of the 1st heat transfer fin 31 and the 2nd heat transfer fin 32 is arrange | positioned in the leeward side, it is carried by the indoor air which flows into the width direction of the 1st flat tube 21 and the 2nd flat tube 22. The condensed water can be made to flow in the up and down direction through the communicating portion 34, particularly the water guiding rib 36. Thus, the drainage property at the time of dew condensation improves by the communicating part 34 of the 1st flat tube 21 and the 2nd flat tube 22 in the leeward side.

(5-2)
In the above embodiment, as shown in FIG. 5, the indoor heat exchanger 10 has the first pair P <b> 1 and the second pair P <b> 2 bent into an L shape so that the indoor fan 120 can be enclosed on the inner peripheral side. Yes. Moreover, in the modification 1A, the indoor heat exchanger 10 shown by FIG.12 and FIG.13 is bent by the square shape so that the indoor fan 120 can be enclosed on the inner peripheral side. Furthermore, in the modified example 1B, the indoor heat exchanger 10 shown in FIG. 14 is bent in a C shape so that the indoor fan 120 can be enclosed on the inner peripheral side. With such a configuration, the indoor air blown out from the indoor fan 120 arranged on the inner peripheral side of the plurality of first heat transfer fins 31 along the width direction of the first flat tube 21 and the second flat tube 22. It passes through between the fins of the plurality of second heat transfer fins 32 from between the fins and is led out to the outer peripheral side where the communication portion 34 of the second heat transfer fin 32 is located. As a result, in the indoor heat exchanger 10, drainage of the condensed water is improved by efficiently utilizing the air flow blown out by the indoor fan 120.

(5-3)
As described with reference to FIG. 6, the first flat tubes 21 are positioned at the windward side of 0 mm or more from the windward edges 31 a of the plurality of first heat transfer fins 31, for example, the first heat exchange unit 11 and When the second heat exchanging portion 12 is bent, the first flat tube 21 protruding to the leeward side by 0 mm or more from the windward edge 31a of the first heat transfer fin 31 hits a member such as the roll jig 210 first, The buckling of the windward edge 31a of the first heat transfer fin 31 is prevented. As a result, an increase in ventilation resistance due to deformation of the windward edges 31a of the plurality of first heat transfer fins 31 can be suppressed.

(5-4)
As shown in FIG. 10, when the wall thickness tt3 of the tube walls 21d and 22d in the windward portion located on the windward side is thicker than the wall thickness t2 of the tube walls 21c and 22c in the side surface portion, the first flat tube 21 and the first When the 2 flat tube 22 is bent, the first flat tube 21 and the second flat tube 22 are not easily deformed. As a result, it is possible to suppress a decrease in the pressure resistance of the first flat tube 21 and the second flat tube 22 at the portion bent toward the inner peripheral side of the indoor heat exchanger 10.

(5-5)
A gap CL is formed between the leeward edge 31b of the first heat transfer fin 31 and the windward main portion 33 of the second heat transfer fin 32 shown in FIG. By being configured so that the heat exchange unit 12 does not come into contact, heat conduction from one of the first heat exchange unit 11 and the second heat exchange unit 12 having a temperature difference to the other can be suppressed. . As a result, it is possible to suppress the heat exchange performance between the first heat exchange unit 11 and the second heat exchange unit 12 from being deteriorated due to heat conduction between the first heat exchange unit 11 and the second heat exchange unit 12. .

(5-6)
As shown in FIG. 11, the second flat tubes 22 are positioned at the windward side of 0 mm or more from the windward edges 32 a of the plurality of second heat transfer fins 32, so that the first heat exchange unit 11 and the second heat exchange unit 11 It becomes easy to maintain the clearance CL between the heat exchange parts 12. The clearance CL maintained by this arrangement of the second flat tubes 22 makes it easy to prevent the performance of heat exchange between the first heat exchange unit 11 and the second heat exchange unit 12 from being deteriorated.

(5-7)
As shown in FIG. 11, the second flat tube 22 is located 2 mm or less above the windward edge of the plurality of second heat transfer fins, so that the first heat exchange unit 11 and the second heat A gap CL of 2 mm or less can be reliably formed between the exchange parts 12. That is, the distance D3 between the leeward edge 31b of the first heat transfer fin 31 and the windward edge 32a of the second heat transfer fin 32 is 2 mm or less. Condensed water is attracted by the surface tension in a gap of 2 mm or less formed between the first heat exchange unit 11 and the second heat exchange unit 12 and easily flows down. As a result, the drainage performance of the condensed water in the indoor heat exchanger 10 is improved.

(5-8)
As shown in FIG. 11, the leeward edges 31b of the plurality of first heat transfer fins 31 extend linearly along the gap CL in the vertical direction, so that the condensed water can be easily guided along the leeward edge 31b. As a result, it is possible to suppress the occurrence of problems due to condensed water, such as scattering of condensed water.

(5-9)
As shown in FIG. 5, the first heat exchanging part 11 and the second heat exchanging part 12 are two sets of L-shaped first pair P1 and second pair P2, and the square type 1 shown in FIGS. Around the windward space in the first heat exchange section 11 and the second heat exchange section 12 in the set or in the one set of the first heat exchange section and the second heat exchange section in the C shape shown in FIG. Can be enclosed. As a result, the configuration of the indoor unit 100 to which the indoor heat exchanger 10 is applied can be simplified.

DESCRIPTION OF SYMBOLS 10 Indoor heat exchanger 11 1st heat exchange part 12 2nd heat exchange part 21 1st flat tube 21b, 21c, 21d Tube wall 22 2nd flat tube 22b, 22c, 22d Tube wall 31 1st heat transfer fin 31a Windward Edge 31b Windward edge 32 Second heat transfer fin 32a Windward edge 32b Windward edge 33 Main part 34 Communication part 35 Notch

International Publication No. 08/41656 Pamphlet International Publication No. 13/160957 Pamphlet

  The present invention relates to an indoor heat exchanger, and more particularly to an indoor heat exchanger used for heat exchange between indoor air and a refrigerant.

  Conventionally, as a heat exchanger for exchanging heat with indoor air in an indoor unit of an air conditioner, for example, a cross fin type heat exchange as described in Patent Document 1 (International Publication No. 08/41656 pamphlet). There is a vessel. In such a cross fin type heat exchanger, a dead water area is likely to occur on the leeward side of the cylindrical heat transfer tube penetrating the fin. Since the fin portion corresponding to the dead water area contributes less to heat exchange, it is necessary to provide three or more rows of heat transfer tubes in order to ensure the necessary heat exchange performance and increase the performance. Thus, the increase in the number of rows of 3 or more leads to an increase in the size of the heat exchanger. Further, since the airflow passing between the heat transfer tubes passes through the passage narrowed by the heat transfer tubes, the heat transfer tubes increase the ventilation resistance.

  In contrast to such a cross-fin type heat exchanger, for example, Patent Document 2 (International Publication No. 13/160957 pamphlet) describes a heat exchanger using a flat tube instead of a cylindrical heat transfer tube. Yes. In the heat exchanger using such a flat tube, the ventilation resistance is suppressed by using the flat tube.

  However, it is desired to increase the size of the heat exchanger such as multiple rows in order to improve the performance of the heat exchanger. Thus, when heat exchangers are arranged in a plurality of rows, there is a problem in that ventilation resistance increases due to deformation of the fins when the flat tube is bent. Further, since the flat tube becomes longer along the airflow direction of the indoor air than the circular tube, it is difficult to drain the condensed water generated in the indoor heat exchanger.

  The subject of this invention is providing the indoor heat exchanger by which the increase in ventilation resistance is suppressed and drainage of condensed water is easy.

The indoor heat exchanger according to the first aspect of the present invention includes a plurality of first flat tubes arranged in a plurality of stages and a plurality of first heat transfer fins intersecting the first flat tubes, and flows in the width direction of the first flat tubes. A first heat exchange unit that exchanges heat between the indoor air and the refrigerant that flows in the first flat tube, and a plurality of second heat exchangers that intersect the second flat tube and the second flat tube arranged in a plurality of stages. A first heat transfer fin having a fin and a second heat exchanging part that exchanges heat between the indoor air flowing in the width direction of the second flat tube and the refrigerant flowing in the second flat tube And the second heat transfer fin include a windward main portion where a notch into which the first flat tube and the second flat tube are inserted is formed, and a leeward communication portion located on the opposite side of the opening end of the notch. a, a first heat exchanger and the second heat exchange unit, a first flat tube of each stage and the second flat tube is installed in the width direction, the windward side inner peripheral side, It is bent so the lower side is the outer circumferential side.

  According to the indoor heat exchanger according to the first aspect of the present invention, the cutouts of the first heat transfer fin and the second heat transfer fin are arranged inside, and the first flat tube and the second flat tube are bent inward. Therefore, deformation of the main part of the first heat transfer fin and the main part of the second heat transfer fin is suppressed. Since the communicating portion of the first heat transfer fin and the second heat transfer fin is disposed on the leeward side, the condensed water carried by the indoor air flowing in the width direction of the first flat tube and the second flat tube is directed upward and downward. It can be made to flow through the communication part.

  The indoor heat exchanger according to the second aspect of the present invention is the indoor heat exchanger according to the first aspect, wherein the first heat exchange part and the second heat exchange part are bent so as to surround the indoor fan on the inner peripheral side, The indoor air blown out from the indoor fan disposed on the inner peripheral side is moved between the fins of the plurality of first heat transfer fins along the width direction of the first flat tube and the second flat tube. It arrange | positions so that derivation | leading-out can pass through between fins and the outer peripheral side with a communication part of a 2nd heat transfer fin.

  According to the indoor heat exchanger according to the second aspect of the present invention, the indoor air blown out from the indoor fan surrounded by the inner peripheral sides of the first heat exchanging part and the second heat exchanging part is converted into the first flatness having a small ventilation resistance. It can be made to blow in the width direction of a pipe and the 2nd flat tube, and condensed water can be conveyed over the whole indoor heat exchanger from the inner circumference side to the outer circumference side of the 1st heat exchange part and the 2nd heat exchange part.

  The indoor heat exchanger according to the third aspect of the present invention is the indoor heat exchanger according to the first aspect or the second aspect, wherein the plurality of first flat tubes are 0 mm from the windward edge of the plurality of first heat transfer fins. As described above, they are arranged on the windward side.

  According to the indoor heat exchanger according to the third aspect of the present invention, the first flat tube is located at the windward side of 0 mm or more from the windward edge of the plurality of first heat transfer fins, for example, the first heat exchange. The first flat tube protruding to the leeward side by 0 mm or more from the windward edge of the first heat transfer fin when the part and the second heat exchange part are bent hits the member etc. first, for example, the plurality of first heat transfer fins Upwind edge buckling is prevented.

  An indoor heat exchanger according to a fourth aspect of the present invention is the indoor heat exchanger according to the third aspect, wherein the plurality of first flat tubes and the plurality of second flat tubes are of the windward portion located on the windward side. The wall thickness of the tube wall is thicker than the wall thickness of the side wall portion located in the step direction of the first flat tube and the second flat tube.

  According to the indoor heat exchanger according to the fourth aspect of the present invention, since the tube wall of the windward portion located on the windward side is thick, it is deformed when the first flat tube and the second flat tube are bent. It becomes difficult.

  An indoor heat exchanger according to a fifth aspect of the present invention is the indoor heat exchanger according to any one of the first to fourth aspects, wherein the first heat exchange unit is a plurality of first heat transfer units of the first heat exchange unit. A gap is formed between the leeward edge of the fin and the main part on the windward side of the second heat transfer fin of the second heat exchanging part so as not to contact the second heat exchanging part.

  According to the indoor heat exchanger which concerns on the 5th viewpoint of this invention, it is comprised so that a 1st heat exchange part and a 2nd heat exchange part may not contact, and the 1st heat exchange part and 2nd with a temperature difference are comprised. It is possible to suppress heat conduction from one of the heat exchange units to the other.

  The indoor heat exchanger according to a sixth aspect of the present invention is the indoor heat exchanger according to the fifth aspect, wherein the second flat tube is located at an upstream of 0 mm or more from the windward edge of the plurality of second heat transfer fins. Are arranged.

  According to the indoor heat exchanger according to the sixth aspect of the present invention, the second flat tube is located on the windward side by 0 mm or more from the windward edge of the plurality of second heat transfer fins, It becomes easy to maintain the clearance gap between 2nd heat exchange parts.

  The indoor heat exchanger according to a seventh aspect of the present invention is the indoor heat exchanger according to the sixth aspect, wherein the second flat tube is located 2 mm or less above the windward edge of the plurality of second heat transfer fins. It is what is arranged.

  According to the indoor heat exchanger according to the seventh aspect of the present invention, the second flat tube is positioned on the windward side by 2 mm or less from the windward edge of the plurality of second heat transfer fins. Condensed water is attracted by the surface tension in a gap of 2 mm or less formed between the second heat exchange part and the second heat exchange part, so that it easily flows down.

  An indoor heat exchanger according to an eighth aspect of the present invention is the indoor heat exchanger according to any one of the fifth to seventh aspects, wherein the first heat exchanging section has gaps between the leeward edges of the plurality of first heat transfer fins. It extends in the vertical direction along a straight line.

  In the indoor heat exchanger according to the eighth aspect of the present invention, the leeward edges of the plurality of first heat transfer fins extend linearly along the gap in the vertical direction, so that the condensed water can be easily guided along the leeward edge.

  An indoor heat exchanger according to a ninth aspect of the present invention is the indoor heat exchanger according to any one of the fifth to eighth aspects, wherein the first heat exchange part and the second heat exchange part are the first flat tube and the first heat exchange part. 2 It is bent into an L shape, a C shape or a square shape when viewed from the step direction of the flat tube.

  According to the indoor heat exchanger pertaining to the ninth aspect of the present invention, the first heat exchange section and the second heat exchange section are bent into an L shape, a C shape, or a square shape. One pair or two pairs of the part and the second heat exchange part can surround the space on the windward side.

  In the indoor heat exchanger which concerns on the 1st viewpoint of this invention, the increase in ventilation resistance is suppressed and the drainage property at the time of dew condensation improves by the communicating part on the leeward side.

  In the indoor heat exchanger which concerns on the 2nd viewpoint of this invention, the airflow which an indoor fan blows around can be utilized efficiently, and the drainage property about condensed water can be improved.

  In the indoor heat exchanger which concerns on the 3rd viewpoint of this invention, the increase in the ventilation resistance by deformation | transformation of the windward edge of a some 1st heat-transfer fin can be suppressed.

  In the indoor heat exchanger which concerns on the 4th viewpoint of this invention, it can suppress that the pressure | voltage resistant strength of a 1st flat tube and a 2nd flat tube falls in the part bent to the inner peripheral side.

  In the indoor heat exchanger which concerns on the 5th viewpoint of this invention, it can suppress that the performance of heat exchange falls by the heat conduction between a 1st heat exchange part and a 2nd heat exchange part.

  In the indoor heat exchanger which concerns on the 6th viewpoint of this invention, it prevents that the performance of a 1st heat exchange part and a 2nd heat exchange part falls by the heat conduction between a 1st heat exchange part and a 2nd heat exchange part. It becomes easy.

  In the indoor heat exchanger according to the seventh aspect of the present invention, the drainage performance of the condensed water is improved.

  In the indoor heat exchanger which concerns on the 8th viewpoint of this invention, it can suppress that the malfunction by condensed water, such as a condensed water splashing, arises.

  In the indoor heat exchanger according to the ninth aspect of the present invention, the configuration of the apparatus to which the indoor heat exchanger is applied can be simplified.

The perspective view which shows the external appearance of the indoor unit which concerns on embodiment. Sectional drawing of the indoor unit of FIG. The typical top view of an indoor heat exchanger. Sectional drawing which shows the indoor heat exchanger of the place of the II line | wire of FIG. 3, and its surrounding structure. The schematic diagram when the indoor heat exchanger which functions as an evaporator is seen from the top. The partial expanded sectional view which shows an example of the relationship between a 1st flat tube, a 2nd flat tube, and a notch. The schematic diagram which shows an example of the manufacturing process of an indoor heat exchanger. The schematic diagram which shows an example of the other manufacturing process of an indoor heat exchanger. Sectional drawing which shows typically the relationship between the component of an indoor heat exchanger, and a jig | tool. Sectional drawing for demonstrating the wall thickness of the tube wall of a 1st flat tube and a 2nd flat tube. The partial expanded sectional view of the 1st heat exchange part and the 2nd heat exchange part. The schematic diagram when the indoor heat exchanger which concerns on modification 1A is seen from the top. The schematic diagram when the other indoor heat exchanger which concerns on modification 1A is seen from the top. The figure which shows an internal structure when the indoor unit which concerns on the modification 1B is seen from the bottom. Sectional drawing of the indoor unit cut | disconnected by the II-II line | wire of FIG.

(1) Outline of Configuration of Air Conditioner FIG. 1 shows an appearance of an indoor unit to which an indoor heat exchanger according to an embodiment of the present invention is applied, and FIG. 2 shows the indoor unit of FIG. The internal structure is shown. The indoor unit 100 is a ceiling-mounted indoor unit that is used for cooling and heating a room in a building such as a building by performing a vapor compression refrigeration cycle operation. As shown in FIG. 2, the indoor unit 100 is embedded in a ceiling CE of a room such as a building. The indoor unit 100 includes an indoor fan 120 and an indoor heat exchanger 10. When the indoor fan 120 is driven, the indoor unit 100 sucks indoor air from the suction port 101 in the lower center of the indoor unit 100 and blows out air from the four outlets 102 of the indoor unit 100. The four outlets 102 of the indoor unit 100 extend in parallel to the four sides of the decorative plate 103 having a substantially square bottom surface.

  Inside the indoor unit 100, a bell mouth 104 is attached immediately above the suction port 101. The indoor air sucked from the suction port 101 is guided to the indoor fan 120 by the bell mouth 104. From the indoor fan 120, room air is blown out substantially parallel to the ceiling CE. Then, the indoor air that passes through the indoor heat exchanger 10 that surrounds the indoor fan 120 in the horizontal direction and is blown out from the indoor fan 120 is blown out from the four outlets 102 on the outer periphery of the indoor heat exchanger 10. The

  In the indoor heat exchanger 10, for example, condensation may occur when the temperature of the indoor heat exchanger 10 is lower than the indoor temperature during cooling operation. In the indoor unit 100, a drain pan 130 is provided below the indoor heat exchanger 10 in order to receive condensed water generated by condensation in the indoor heat exchanger 10. The condensed water generated in the indoor heat exchanger 10 is attracted by gravity, flows downward through the indoor heat exchanger 10, and falls from the indoor heat exchanger 10 to the drain pan 130.

(2) Indoor heat exchanger 10
The state which looked at the indoor heat exchanger 10 from the top is shown by FIG. As illustrated in FIG. 3, the indoor heat exchanger 10 surrounds the indoor fan 120. The arrows Ar1, Ar2, Ar3, Ar4 in FIG. 3 indicate the direction of air flow. Moreover, the four blower outlets 102 are formed in the direction which these arrows Ar1-Ar4 faces. The indoor heat exchanger 10 has a shape along each side of a square having a center of a diagonal line at the center of the indoor fan 120 as viewed from above. However, the location corresponding to the location where the drain pump 140 is formed is recessed on the inner peripheral side.

  The indoor heat exchanger 10 is, for example, a part of a refrigerant circuit (not shown) that performs a refrigeration cycle, and is a device that exchanges heat between refrigerant flowing through the refrigerant circuit and room air. A liquid pipe 51 and a gas pipe 52 extending from the indoor heat exchanger 10 are connected to the refrigerant circuit. A liquid refrigerant mainly flows through the liquid pipe 51 extending from the indoor heat exchanger 10, and a gas refrigerant mainly flows through the gas pipe 52.

(2-1) 1st heat exchange part 11 and 2nd heat exchange part 12
FIG. 4 shows an enlarged cross-sectional structure of a part of the indoor unit 100 cut at a location corresponding to the location of line II in FIG. As shown in FIG. 4, the indoor heat exchanger 10 includes a first heat exchange unit 11 on the inner peripheral side and a second heat exchange unit 12 on the outer peripheral side. In other words, the first heat exchange unit 11 is disposed on the leeward side, and the second heat exchange unit 12 is disposed on the leeward side. The first heat exchange unit 11 includes a plurality of first flat tubes 21 arranged in a plurality of stages and a plurality of first heat transfer fins 31 intersecting with the plurality of first flat tubes 21. The first flat tube 21 and the first heat transfer fin 31 are substantially orthogonal to each other. Although the number of the first heat transfer fins 31 shown in FIG. 4 is only one, the other first heat transfer fins 31 adjacent to the first heat transfer fins 31 shown in FIG. The first heat transfer fins 31 are arranged in parallel. However, the first heat transfer fins 31 adjacent to each other at the bent portion 10R of the indoor heat exchanger 10 are not parallel to each other, and the outer periphery is larger than the interval on the inner peripheral side of the first heat transfer fins 31 adjacent to each other. The side spacing is widened. In one first flat tube 21, a plurality of flow paths 21a are formed in a line from the windward side to the leeward side, and the refrigerant flows through each flow path 21a.

  The second heat exchange unit 12 includes a plurality of second flat tubes 22 arranged in a plurality of stages and a plurality of second heat transfer fins 32 intersecting with the plurality of second flat tubes 22. The second flat tube 22 and the second heat transfer fin 32 are substantially orthogonal to each other. Although the number of the second heat transfer fins 32 shown in FIG. 4 is only one, the other second heat transfer fins 32 adjacent to the second heat transfer fins 32 shown in FIG. The second heat transfer fins 32 are arranged in parallel. However, the second heat transfer fins 32 adjacent to each other at the bent portion 10 </ b> R of the indoor heat exchanger 10 are not parallel to each other, and the outer periphery is closer to the inner peripheral side interval between the adjacent second heat transfer fins 32. The side spacing is widened. In one second flat tube 22, a plurality of flow paths 22a are formed in a line from the windward side to the leeward side, and the refrigerant flows through each flow path 22a.

  FIG. 5 schematically shows an example of the flow direction of the refrigerant flowing through the indoor heat exchanger 10. The indoor heat exchanger 10 includes a flow divider 53 connected to the liquid pipe 51, a liquid header 54 connected to the flow divider 53, a gas header 55 connected to the gas pipe 52, and a turn-up header 56. . The indoor heat exchanger 10 shown in FIGS. 3 and 5 is configured by using two sets of first heat exchange units 11 and second heat exchange units 12. The one arranged near the drain pump 140 is called the first heat exchange unit 11 and the second heat exchange unit 12 or the first pair P1 of the first pair P1, and the remaining one is the first heat of the second pair P2. It is called the exchange unit 11 and the second heat exchange unit 12 or the second pair P2.

  In FIG. 5, the flow of the refrigerant when the indoor heat exchanger 10 functions as an evaporator is indicated by arrows Ar5 to Ar8. In the first pair P1, the liquid refrigerant that has flowed from the liquid pipe 51 into the first flat tube 21 via the flow divider 53 and the liquid header 54 flows in the direction of the arrow Ar5. Then, the refrigerant flowing through the first flat pipe 21 of the first pair P1 enters the second flat pipe 22 from the first flat pipe 21 at the turn-back header 56, flows in the direction of the arrow Ar6, and passes through the gas header 55 to the gas pipe. It flows to 52. In the second pair P2, the liquid refrigerant that has flowed from the liquid pipe 51 into the first flat tube 21 via the flow divider 53 and the liquid header 54 flows in the direction of the arrow Ar7. Then, the refrigerant flowing through the first flat tube 21 of the second pair P2 enters the second flat tube 22 from the first flat tube 21 at the turn-up header 56, flows in the direction of the arrow Ar8, and passes through the gas header 55 to the gas pipe. It flows to 52. As described above, in the indoor heat exchanger 10 shown in FIG. 5, the liquid refrigerant evaporates while flowing through the first flat tube 21 and the second flat tube 22 and changes to a gas refrigerant. The indoor heat exchanger 10 shown in FIG. 5 includes a first heat exchange unit 11 and a second heat exchange unit 12 of a first pair P1 bent into an L shape, and a second pair P2 bent into an L shape. The first heat exchange unit 11 and the second heat exchange unit 12 are combined. Note that the first pair P1 has two bent portions 10R, and the second pair P2 has only one bent portion 10R, but both shapes are classified as L-shaped.

  As described above, the first pair P1 and the second pair P2 are bent in an L shape so that the first heat exchange unit 11 and the second heat exchange unit 12 surround the indoor fan 120 on the inner peripheral side. To be able to do that. In both the first pair P 1 and the second pair P 2, the indoor air blown from the indoor fan 120 arranged on the inner peripheral side is passed through the first flat tube 21 and the second flat tube 22 along the width direction. It arrange | positions so that it can guide | lead to the outer peripheral side with the communication part 34 (refer FIG. 6) of the 2nd heat transfer fin 32 through between the fins of the 2nd heat transfer fin 32 from between the fins of the 1 heat transfer fin 31. .

(2-2) Detailed Configuration of First Heat Transfer Fin 31 FIG. 6 shows the first heat transfer fin 31 of the first heat exchange unit 11 shown in FIG. 4 and a part of the first flat tube 21 fitted therein. It is shown further enlarged. Note that the structure of the first heat exchange unit 11 shown enlarged in FIG. 6 is also common to the second heat exchange unit 12, and therefore, the first heat exchange unit 11 will be described here and the second heat exchange unit 11 will be described. The description of the same configuration as the first heat exchange unit 11 in the exchange unit 12 is omitted.

  The first heat transfer fin 31 includes a windward main part 33 in which a notch 35 into which the first flat tube 21 is inserted is formed, and a leeward communication part 34 located on the opposite side of the opening end 35 a of the notch 35. Have. The first flat tube 21 is inserted in the direction of the arrow Ar9 in FIG. Similarly, the second heat transfer fin 32 is connected to the leeward side main portion 33 in which the notch 35 into which the second flat tube 22 is inserted and the leeward side communication located on the opposite side of the opening end 35a of the notch 35. Part 34 is provided. The communication portion 34 is formed with water guiding ribs 36 that help drain the condensed water. The water guide ribs 36 are portions extending from the pressed grooves. When the water guide ribs 36 are viewed from the one main surface f1 of the first heat transfer fins 31 (or the second heat transfer fins 32), the convex structure has the water guide ribs 36. When viewed from the other main surface on the opposite side of the one main surface f1, the concave structure extends vertically along the water guiding rib 36. A plurality of cut-and-raised portions 37 protruding in a bridge shape are formed on the one main surface f1 side of the first heat transfer fin 31 (or the second heat transfer fin 32). As can be seen from FIG. 6, the cut-and-raised portion 37 is not formed around the notch 35.

(3) Bending process of components of indoor heat exchanger 10 (3-1) Outline of bending process Using FIGS. 7, 8 and 9, the indoor heat exchanger 10 shown in FIG. 3 is bent. A method for forming the portion 10R will be described. In order to form the bent portion 10R, for example, two jigs shown in FIGS. 7 and 8 are used. That is, the bent portion 10 </ b> R of the indoor heat exchanger 10 is formed using the roll jig 210 and the pressing jig 220. As shown in FIG. 7, the roll jig 210 is fixed to the one end 301 side of the component 300 of the indoor heat exchanger 10 by placing it on the place where the bent portion 10 </ b> R is to be formed. Then, the pressing jig 220 is pressed against the component 300 from the side opposite to the roll portion 211 of the roll jig 210. Further, the pressing jig 220 presses the portion closer to the other end 302 of the component 300 than the roll portion 211.

  Next, as shown in FIG. 8, a force is applied to the component 300 of the indoor heat exchanger 10 from the pressing jig 220 to bend the first flat tube 21 and the second flat tube 22 of the component 300. At the place where the bent portion 10 </ b> R is formed, the radius of curvature of the second flat tube 22 is larger than the radius of curvature of the first flat tube 21. Accordingly, when the bending process is completed, the end of the first flat tube 21 and the end of the second flat tube 22 at the other end 302 of the component 300 are shown in FIG. As described above, the end of the second flat tube 22 is designed to protrude beyond the end of the first flat tube 21 before the component 300 is bent.

  FIG. 9 shows an enlarged view of the part 300 on which the roll jig 210 and the pressing jig 220 are pressed. As can be seen from FIG. 9, the first flat tube 21 mainly contacts the roll jig 210. Although not shown in FIG. 9, a plate is inserted between the first heat exchange unit 11 and the second heat exchange unit 12 during the bending process when completed. . In other words, during the bending process, the second flat tube 22 transmits the force from the second flat tube 22 to the first heat transfer fins 31 through the plate. Similarly, the area where the pressing jig 220 contacts the second heat transfer fin 32 also has a wide area. Then, the pressure received by the second heat transfer fin 32 from the pressing jig 220 and the pressure received by the first heat transfer fin 31 from the plate are smaller than the pressure received by the first flat tube 21 from the roll jig 210. As a result, buckling of the leeward edge 31b of the first heat transfer fin 31 and the leeward edge 32b (see FIG. 11) of the second heat transfer fin 32 during bending is prevented.

(3-2) Positional relationship between flat tubes and heat transfer fins As shown in FIG. 6, the plurality of first flat tubes 21 are 0 mm from the windward edges 31 a of the plurality of first heat transfer fins 31. As described above, they are arranged on the windward side. That is, the distance D1 between the windward end of the first flat tube 21 and the windward edge 31a of the first heat transfer fin 31 shown in FIG. 6 is 0 mm or more, and there is a manufacturing error, for example. Considering this, the distance D1 is preferably set to 0.5 mm or more. As already described, in order to reduce the force applied to the first heat transfer fins 31 during bending, it is preferable that the first flat tube 21 protrudes.

  Further, during bending, a force is applied to the first flat tube 21 from the roll jig 210, and a force is applied to the second flat tube 22 from a plate sandwiched between the first flat tube 21 and the second flat tube 22. . The wall thickness of the tube wall of the 1st flat tube 21 and the 2nd flat tube 22 is set in consideration of the force which these apply. Specifically, as shown in FIG. 10, the first flat tube 21 and the second flat tube 22 have the wall thickness t3 of the tube walls 21d and 22d in the windward portion located on the windward side. It is thicker than the wall thickness t <b> 2 of the tube walls 21 c and 22 c at the side portions located in the step direction of the flat tube 21 and the second flat tube 22. Note that the wall thickness t3 of the tube walls 21d and 22d in the windward portion located on the windward side than the wall thickness t1 of the inner walls 21b and 22b that separate the flow paths of the first flat tube 21 and the second flat tube 22 having multiple holes Is thicker.

  FIG. 11 shows a part of the first heat exchange unit 11 and the second heat exchange unit 12 in an enlarged manner. The first heat exchanging portion 11 has a gap CL formed between the leeward edge 31b of the first heat transfer fin 31 and the main portion 33 on the upwind side of the second heat transfer fin 32 of the second heat exchange portion 12. 2. It is comprised so that it may not contact with the heat exchange part 12. FIG. More specifically, in the first heat exchange unit 11, the leeward edges 31b of the plurality of first heat transfer fins 31 extend linearly in the vertical direction along the gap CL. The distance D3 between the leeward edge 31b of the first heat transfer fin 31 and the windward edge 32a of the second heat transfer fin 32 is preferably ensured by 2 mm or less.

  In addition, as shown in FIG. 6, the plurality of second flat tubes 22 are arranged to be located 0 mm or more on the windward side of the windward edges 32 a of the plurality of second heat transfer fins 32. That is, the distance D2 between the windward end of the second flat tube 22 and the windward edge 32a of the second heat transfer fin 32 shown in FIG. 6 is 0 mm or more, and the condensed water has surface tension. Is preferably set to 2 mm or less in order to make it easy to flow down. This 2 mm takes into account the size of the water droplets. If this is 2 mm or more, the water droplets are hardly attracted by surface tension (capillary phenomenon). Further, in order to reduce the force applied to the second heat transfer fins 32 during bending, the second flat tubes 22 are projected (the second flat tubes 22 are windward of the second heat transfer fins 32). It is preferable that the edge 32a protrudes more than 0 mm and is located on the windward side.

(4) Modification (4-1) Modification 1A
In the above embodiment, the indoor heat exchanger 10 combines the first pair P1 and the second pair bent in an L shape when viewed from the step direction of the first flat tube 21 and the second flat tube 22, The case where it is configured to surround the entire circumference of the windward space where the fan 120 is arranged has been described as an example. However, the shape of the indoor heat exchanger 10 for enclosing the windward space where the indoor fan 120 is disposed is, for example, as shown in FIG. 12 or FIG. 12 when viewed from the step direction of the first flat tube 21 and the second flat tube 22. It may be a square shape as shown in FIG.

  In FIG. 12, the flow of the refrigerant when the square indoor heat exchanger 10 functions as an evaporator is indicated by arrows Ar11 and Ar12. The liquid refrigerant that has flowed from the liquid pipe 51 into the first flat tube 21 via the flow divider 53 and the liquid header 54 flows in the direction of the arrow Ar11. The refrigerant flowing through the first flat tube 21 enters the second flat tube 22 from the first flat tube 21 at the folding header 56, flows in the direction of the arrow Ar 12, and flows to the gas pipe 52 via the gas header 55.

FIG. 13 shows the flow of the refrigerant when the square indoor heat exchanger 10 functions as an evaporator. The refrigerant flows in the first flat tube 21 of the first heat exchange unit 11 with arrows Ar12 and Ar14 and second heat exchange. The second flat tube 22 of the portion 12 is indicated by arrows Ar13 and Ar15. The liquid refrigerant flowing from the liquid pipe 51 into the first flat tube 21 via the flow divider 53 and the liquid header 54 is indicated by the arrows Ar12. It flows in the direction of Ar13. The refrigerant flowing through the first flat tube 21 flows in the directions of arrows Ar14 and Ar15, and flows to the gas pipe 52 via the gas header 55. At the position indicated by the arrows Ar12 and Ar14 (4-2) Modification 1B
Although the said embodiment demonstrated the case where the indoor heat exchanger 10 encloses the perimeter of the indoor fan 120, the structure which a part of circumference | surroundings of an indoor fan is not enclosed may be sufficient. When viewed from the step direction of the first flat tube 21 and the second flat tube 22, for example, a C shape as shown in FIGS. 14 and 15 may be used.

  FIG. 14 shows the internal structure of the indoor unit 100 as viewed from below, and FIG. 15 shows a cross-sectional structure taken along line II-II in FIG. The indoor unit 100 includes an indoor fan 120 and an indoor heat exchanger 10. The C-shaped indoor heat exchanger 10 is a portion indicated by hatching. When the indoor fan 120 is driven, the indoor unit 100 sucks room air from the suction port 101 in the lower center of the indoor unit 100 and blows air from the outlet 102 of the indoor unit 100.

  Inside the indoor unit 100, a bell mouth 104 is attached immediately above the suction port 101. The indoor air sucked from the suction port 101 is guided to the indoor fan 120 by the bell mouth 104. The indoor fan 120 substantially blows out indoor air in the horizontal direction. And the indoor air which passed the indoor heat exchanger 10 which encloses the indoor fan 120 in a C shape in a horizontal direction, and was blown off from the indoor fan 120 is blown off from the blower outlet 102.

  In the indoor heat exchanger 10, for example, condensation may occur when the temperature of the indoor heat exchanger 10 is lower than the indoor temperature during cooling operation. In the indoor unit 100, a drain pan 130 is provided below the indoor heat exchanger 10 in order to receive condensed water generated in the indoor heat exchanger 10. The condensed water generated in the indoor heat exchanger 10 is attracted by gravity, flows downward through the indoor heat exchanger 10, and falls from the indoor heat exchanger 10 to the drain pan 130.

(4-3) Modification 1C
The refrigerant flowing through the first flat tube 21 and the second flat tube 22 of the above embodiment may be other than a vapor compressor type refrigerant, for example, water.

(4-4) Modification 1D
In the indoor heat exchanger 10 of the present embodiment, the heat exchange unit has two rows of the first heat exchange unit 11 and the second heat exchange unit 12, but the present invention can also be applied to an indoor heat exchanger having three or more rows.

(4-5) Modification 1E
The indoor heat exchanger according to the present invention can be applied not only to the ceiling-embedded indoor unit 100 but also to, for example, a ceiling-suspended indoor unit.

(4-6) Modification 1F
In the said embodiment, although the 1st flat tube 21 and the 2nd flat tube 22 are arranged side by side at the same height, arrangement | positioning of the 1st flat tube and the 2nd flat tube of the indoor heat exchanger which concerns on this invention is the arrangement | positioning. A staggered arrangement may also be used.

(5) Features (5-1)
As described above, the notches 35 of the first heat transfer fins 31 and the second heat transfer fins 32 are arranged on the inner side, and the first flat tube 21 and the second flat tube 22 are bent inward. Deformation of the main portion 33 of the first heat transfer fin 31 and the main portion 33 of the second heat transfer fin 32 is suppressed. The deformation of the main portion 33 of the first heat transfer fin 31 and the main portion 33 of the second heat transfer fin 32 is suppressed, and the ventilation resistance is not increased by the deformation, and the increase of the ventilation resistance is suppressed.

  Moreover, since the communication part 34 of the 1st heat transfer fin 31 and the 2nd heat transfer fin 32 is arrange | positioned in the leeward side, it is carried by the indoor air which flows into the width direction of the 1st flat tube 21 and the 2nd flat tube 22. The condensed water can be made to flow in the up and down direction through the communicating portion 34, particularly the water guiding rib 36. Thus, the drainage property at the time of dew condensation improves by the communicating part 34 of the 1st flat tube 21 and the 2nd flat tube 22 in the leeward side.

(5-2)
In the above embodiment, as shown in FIG. 5, the indoor heat exchanger 10 has the first pair P <b> 1 and the second pair P <b> 2 bent into an L shape so that the indoor fan 120 can be enclosed on the inner peripheral side. Yes. Moreover, in the modification 1A, the indoor heat exchanger 10 shown by FIG.12 and FIG.13 is bent by the square shape so that the indoor fan 120 can be enclosed on the inner peripheral side. Furthermore, in the modified example 1B, the indoor heat exchanger 10 shown in FIG. 14 is bent in a C shape so that the indoor fan 120 can be enclosed on the inner peripheral side. With such a configuration, the indoor air blown out from the indoor fan 120 arranged on the inner peripheral side of the plurality of first heat transfer fins 31 along the width direction of the first flat tube 21 and the second flat tube 22. It passes through between the fins of the plurality of second heat transfer fins 32 from between the fins and is led out to the outer peripheral side where the communication portion 34 of the second heat transfer fin 32 is located. As a result, in the indoor heat exchanger 10, drainage of the condensed water is improved by efficiently utilizing the air flow blown out by the indoor fan 120.

(5-3)
As described with reference to FIG. 6, the first flat tubes 21 are positioned at the windward side of 0 mm or more from the windward edges 31 a of the plurality of first heat transfer fins 31, for example, the first heat exchange unit 11 and When the second heat exchanging portion 12 is bent, the first flat tube 21 protruding to the leeward side by 0 mm or more from the windward edge 31a of the first heat transfer fin 31 hits a member such as the roll jig 210 first, The buckling of the windward edge 31a of the first heat transfer fin 31 is prevented. As a result, an increase in ventilation resistance due to deformation of the windward edges 31a of the plurality of first heat transfer fins 31 can be suppressed.

(5-4)
As shown in FIG. 10, when the wall thickness tt3 of the tube walls 21d and 22d in the windward portion located on the windward side is thicker than the wall thickness t2 of the tube walls 21c and 22c in the side surface portion, the first flat tube 21 and the first When the 2 flat tube 22 is bent, the first flat tube 21 and the second flat tube 22 are not easily deformed. As a result, it is possible to suppress a decrease in the pressure resistance of the first flat tube 21 and the second flat tube 22 at the portion bent toward the inner peripheral side of the indoor heat exchanger 10.

(5-5)
A gap CL is formed between the leeward edge 31b of the first heat transfer fin 31 and the windward main portion 33 of the second heat transfer fin 32 shown in FIG. By being configured so that the heat exchange unit 12 does not come into contact, heat conduction from one of the first heat exchange unit 11 and the second heat exchange unit 12 having a temperature difference to the other can be suppressed. . As a result, it is possible to suppress the heat exchange performance between the first heat exchange unit 11 and the second heat exchange unit 12 from being deteriorated due to heat conduction between the first heat exchange unit 11 and the second heat exchange unit 12. .

(5-6)
As shown in FIG. 11, the second flat tubes 22 are positioned at the windward side of 0 mm or more from the windward edges 32 a of the plurality of second heat transfer fins 32, so that the first heat exchange unit 11 and the second heat exchange unit 11 It becomes easy to maintain the clearance CL between the heat exchange parts 12. The clearance CL maintained by this arrangement of the second flat tubes 22 makes it easy to prevent the performance of heat exchange between the first heat exchange unit 11 and the second heat exchange unit 12 from being deteriorated.

(5-7)
As shown in FIG. 11, the second flat tube 22 is located 2 mm or less above the windward edge of the plurality of second heat transfer fins, so that the first heat exchange unit 11 and the second heat A gap CL of 2 mm or less can be reliably formed between the exchange parts 12. That is, the distance D3 between the leeward edge 31b of the first heat transfer fin 31 and the windward edge 32a of the second heat transfer fin 32 is 2 mm or less. Condensed water is attracted by the surface tension in a gap of 2 mm or less formed between the first heat exchange unit 11 and the second heat exchange unit 12 and easily flows down. As a result, the drainage performance of the condensed water in the indoor heat exchanger 10 is improved.

(5-8)
As shown in FIG. 11, the leeward edges 31b of the plurality of first heat transfer fins 31 extend linearly along the gap CL in the vertical direction, so that the condensed water can be easily guided along the leeward edge 31b. As a result, it is possible to suppress the occurrence of problems due to condensed water, such as scattering of condensed water.

(5-9)
As shown in FIG. 5, the first heat exchanging part 11 and the second heat exchanging part 12 are two sets of L-shaped first pair P1 and second pair P2, and the square type 1 shown in FIGS. Around the windward space in the first heat exchange section 11 and the second heat exchange section 12 in the set or in the one set of the first heat exchange section and the second heat exchange section in the C shape shown in FIG. Can be enclosed. As a result, the configuration of the indoor unit 100 to which the indoor heat exchanger 10 is applied can be simplified.

DESCRIPTION OF SYMBOLS 10 Indoor heat exchanger 11 1st heat exchange part 12 2nd heat exchange part 21 1st flat tube 21b, 21c, 21d Tube wall 22 2nd flat tube 22b, 22c, 22d Tube wall 31 1st heat transfer fin 31a Windward Edge 31b Windward edge 32 Second heat transfer fin 32a Windward edge 32b Windward edge 33 Main part 34 Communication part 35 Notch

International Publication No. 08/41656 Pamphlet International Publication No. 13/160957 Pamphlet

  The present invention relates to an indoor heat exchanger, and more particularly to an indoor heat exchanger used for heat exchange between indoor air and a refrigerant.

  Conventionally, as a heat exchanger for exchanging heat with indoor air in an indoor unit of an air conditioner, for example, a cross fin type heat exchange as described in Patent Document 1 (International Publication No. 08/41656 pamphlet). There is a vessel. In such a cross fin type heat exchanger, a dead water area is likely to occur on the leeward side of the cylindrical heat transfer tube penetrating the fin. Since the fin portion corresponding to the dead water area contributes less to heat exchange, it is necessary to provide three or more rows of heat transfer tubes in order to ensure the necessary heat exchange performance and increase the performance. Thus, the increase in the number of rows of 3 or more leads to an increase in the size of the heat exchanger. Further, since the airflow passing between the heat transfer tubes passes through the passage narrowed by the heat transfer tubes, the heat transfer tubes increase the ventilation resistance.

  In contrast to such a cross-fin type heat exchanger, for example, Patent Document 2 (International Publication No. 13/160957 pamphlet) describes a heat exchanger using a flat tube instead of a cylindrical heat transfer tube. Yes. In the heat exchanger using such a flat tube, the ventilation resistance is suppressed by using the flat tube.

  However, it is desired to increase the size of the heat exchanger such as multiple rows in order to improve the performance of the heat exchanger. Thus, when heat exchangers are arranged in a plurality of rows, there is a problem in that ventilation resistance increases due to deformation of the fins when the flat tube is bent. Further, since the flat tube becomes longer along the airflow direction of the indoor air than the circular tube, it is difficult to drain the condensed water generated in the indoor heat exchanger.

  The subject of this invention is providing the indoor heat exchanger by which the increase in ventilation resistance is suppressed and drainage of condensed water is easy.

The indoor heat exchanger according to the first aspect of the present invention includes a plurality of first flat tubes arranged in a plurality of stages and a plurality of first heat transfer fins intersecting the first flat tubes, and flows in the width direction of the first flat tubes. A first heat exchange unit that exchanges heat between the indoor air and the refrigerant that flows in the first flat tube, and a plurality of second heat exchangers that intersect the second flat tube and the second flat tube arranged in a plurality of stages. A first heat transfer fin having a fin and a second heat exchanging part that exchanges heat between the indoor air flowing in the width direction of the second flat tube and the refrigerant flowing in the second flat tube And the second heat transfer fin include a windward main portion where a notch into which the first flat tube and the second flat tube are inserted is formed, and a leeward communication portion located on the opposite side of the opening end of the notch. a, water guide rib extending vertically to the communicating portion of the first heat transfer fins and / or the second heat transfer fins are formed, a first heat exchanger Second heat exchange unit includes a first flat tube of each stage and the second flat tube is installed in the width direction, the windward side inner circumferential side, leeward side is bent so that the outer peripheral side.

  According to the indoor heat exchanger according to the first aspect of the present invention, the cutouts of the first heat transfer fin and the second heat transfer fin are arranged inside, and the first flat tube and the second flat tube are bent inward. Therefore, deformation of the main part of the first heat transfer fin and the main part of the second heat transfer fin is suppressed. Since the communicating portion of the first heat transfer fin and the second heat transfer fin is disposed on the leeward side, the condensed water carried by the indoor air flowing in the width direction of the first flat tube and the second flat tube is directed upward and downward. It can be made to flow through the communication part.

  The indoor heat exchanger according to the second aspect of the present invention has a plurality of first flat tubes arranged in a plurality of stages and a plurality of first heat transfer fins intersecting the first flat tubes, and flows in the width direction of the first flat tubes. A first heat exchange unit that exchanges heat between the indoor air and the refrigerant that flows in the first flat tube, and a plurality of second heat exchangers that intersect the second flat tube and the second flat tube arranged in a plurality of stages. A first heat transfer fin having a fin and a second heat exchanging part that exchanges heat between the indoor air flowing in the width direction of the second flat tube and the refrigerant flowing in the second flat tube And the second heat transfer fin include a windward main portion in which a notch for inserting the first flat tube and the second flat tube is formed, and a leeward communication portion located on the opposite side of the opening end of the notch. And the first heat exchange part and the second heat exchange part have the first flat tube and the second flat tube in each stage installed in the width direction, the windward side is the inner peripheral side, The first heat exchange part is bent so that the lower side is the outer peripheral side, and the leeward edges (31b) of the plurality of first heat transfer fins of the first heat exchange part and the second heat transfer fins of the second heat exchange part A gap of 2 mm or less is formed between the windward main portion and the second heat exchange portion so that the second flat tube has an upwind edge (32a) of the plurality of second heat transfer fins. ) And is located on the windward side by 0 mm or more and 2 mm or less.

  According to the indoor heat exchanger according to the second aspect of the present invention, the cutouts of the first heat transfer fin and the second heat transfer fin are arranged inside, and the first flat tube and the second flat tube are bent inward. Therefore, deformation of the main part of the first heat transfer fin and the main part of the second heat transfer fin is suppressed. Since the communicating portion of the first heat transfer fin and the second heat transfer fin is disposed on the leeward side, the condensed water carried by the indoor air flowing in the width direction of the first flat tube and the second flat tube is directed upward and downward. It can be made to flow through the communication part.

  In addition, since the first heat exchange unit and the second heat exchange unit are configured not to contact each other, heat is conducted from one of the first heat exchange unit and the second heat exchange unit having a temperature difference to the other. Can be suppressed. Moreover, it becomes easy to maintain the clearance gap between a 1st heat exchange part and a 2nd heat exchange part because a 2nd flat tube is located in the windward side 0 mm or more rather than the windward edge of several 2nd heat-transfer fins. . Furthermore, the second flat tube is located 2 mm or less on the windward side of the windward edges of the plurality of second heat transfer fins, so that the 2 mm or less formed between the first heat exchange part and the second heat exchange part. Condensed water is attracted to the gap by the surface tension and easily flows down.

The indoor heat exchanger which concerns on the 3rd viewpoint of this invention is the indoor heat exchanger of the 1st viewpoint or the 2nd viewpoint , The 1st heat exchange part and the 2nd heat exchange part can enclose an indoor fan in an inner peripheral side The indoor air blown from the indoor fan disposed on the inner peripheral side is bent along the width direction of the first flat tube and the second flat tube from between the fins of the plurality of first heat transfer fins. It passes through between the fins of the heat transfer fins and is arranged so as to be able to be led out to the outer peripheral side where there is a communicating portion of the second heat transfer fins.

According to the indoor heat exchanger according to the third aspect of the present invention, the indoor air blown out from the indoor fan surrounded by the inner peripheral sides of the first heat exchanging part and the second heat exchanging part is converted into the first flatness having a small ventilation resistance. It can be made to blow in the width direction of a pipe and the 2nd flat tube, and condensed water can be conveyed over the whole indoor heat exchanger from the inner circumference side to the outer circumference side of the 1st heat exchange part and the 2nd heat exchange part.

An indoor heat exchanger according to a fourth aspect of the present invention is the indoor heat exchanger according to any one of the first to third aspects, wherein the plurality of first flat tubes are windward edges of the plurality of first heat transfer fins. It is located on the windward side by 0 mm or more.

According to the indoor heat exchanger according to the fourth aspect of the present invention, the first flat tube is located at the windward side of 0 mm or more from the windward edge of the plurality of first heat transfer fins, for example, the first heat exchange. The first flat tube protruding to the leeward side by 0 mm or more from the windward edge of the first heat transfer fin when the part and the second heat exchange part are bent hits the member etc. first, for example, the plurality of first heat transfer fins Upwind edge buckling is prevented.

An indoor heat exchanger according to a fifth aspect of the present invention is the indoor heat exchanger according to the fourth aspect , wherein the plurality of first flat tubes and the plurality of second flat tubes are of the windward portion located on the windward side. The wall thickness of the tube wall is thicker than the wall thickness of the side wall portion located in the step direction of the first flat tube and the second flat tube.

According to the indoor heat exchanger according to the fifth aspect of the present invention, the wall of the windward portion located on the windward side is thick, so that the first flat tube and the second flat tube are deformed when bent. It becomes difficult.

The indoor heat exchanger which concerns on the 6th viewpoint of this invention is the indoor heat exchanger of a 1st viewpoint , a 1st heat exchange part is a leeward edge of the several 1st heat-transfer fin of a 1st heat exchange part, and 2nd. A gap is formed between the second heat transfer fin of the heat exchange part and the main part on the windward side so as not to contact the second heat exchange part.

According to the indoor heat exchanger which concerns on the 6th viewpoint of this invention, it is comprised so that a 1st heat exchange part and a 2nd heat exchange part may not contact, and a 1st heat exchange part and 2nd with a temperature difference are comprised. It is possible to suppress heat conduction from one of the heat exchange units to the other.

An indoor heat exchanger according to a seventh aspect of the present invention is the indoor heat exchanger according to the sixth aspect, wherein the second flat tube is windward by 0 mm or more and 2 mm or less from the windward edge of the plurality of second heat transfer fins. It is the thing which is located and located.

According to the indoor heat exchanger according to the seventh aspect of the present invention, the second flat tube is located at the windward side of 0 mm or more from the windward edge of the plurality of second heat transfer fins, It becomes easy to maintain the clearance gap between 2nd heat exchange parts . Further, the second flat tube is located 2 mm or less on the windward side of the windward edges of the plurality of second heat transfer fins, so that the 2 mm or less formed between the first heat exchange unit and the second heat exchange unit. Condensed water is attracted to the gap by the surface tension and easily flows down.

An indoor heat exchanger according to an eighth aspect of the present invention is the indoor heat exchanger according to any one of the second aspect, the sixth aspect, or the seventh aspect, wherein the first heat exchange unit is a plurality of first heat transfer fins. The leeward edge extends linearly along the gap in the vertical direction.

  In the indoor heat exchanger according to the eighth aspect of the present invention, the leeward edges of the plurality of first heat transfer fins extend linearly along the gap in the vertical direction, so that the condensed water can be easily guided along the leeward edge.

An indoor heat exchanger according to a ninth aspect of the present invention is the indoor heat exchanger according to any one of the first to eighth aspects , wherein the first heat exchange part and the second heat exchange part are the first flat tube and the first heat exchanger. 2 It is bent into an L shape, a C shape or a square shape when viewed from the step direction of the flat tube.

  According to the indoor heat exchanger pertaining to the ninth aspect of the present invention, the first heat exchange section and the second heat exchange section are bent into an L shape, a C shape, or a square shape. One pair or two pairs of the part and the second heat exchange part can surround the space on the windward side.

In the indoor heat exchanger according to the first aspect or the second aspect of the present invention, an increase in ventilation resistance is suppressed, and drainage at the time of condensation is improved by the communication part on the leeward side.

In the indoor heat exchanger which concerns on the 3rd viewpoint of this invention, the drainage property about condensed water can be improved by utilizing efficiently the air flow which an indoor fan blows around.

In the indoor heat exchanger which concerns on the 4th viewpoint of this invention, the increase in the ventilation resistance by deformation | transformation of the windward edge of a some 1st heat-transfer fin can be suppressed.

In the indoor heat exchanger which concerns on the 5th viewpoint of this invention, it can suppress that the pressure | voltage resistant strength of a 1st flat tube and a 2nd flat tube falls in the part bent to the inner peripheral side.

In the indoor heat exchanger which concerns on the 2nd viewpoint or the 6th viewpoint of this invention, it can suppress that the performance of heat exchange falls by the heat conduction between a 1st heat exchange part and a 2nd heat exchange part.

In the indoor heat exchanger according to the second aspect or the seventh aspect of the present invention, the performance of the first heat exchange unit and the second heat exchange unit is deteriorated due to heat conduction between the first heat exchange unit and the second heat exchange unit. It becomes easy to prevent . Moreover, the drainage performance of condensed water improves.

  In the indoor heat exchanger which concerns on the 8th viewpoint of this invention, it can suppress that the malfunction by condensed water, such as a condensed water splashing, arises.

  In the indoor heat exchanger according to the ninth aspect of the present invention, the configuration of the apparatus to which the indoor heat exchanger is applied can be simplified.

The perspective view which shows the external appearance of the indoor unit which concerns on embodiment. Sectional drawing of the indoor unit of FIG. The typical top view of an indoor heat exchanger. Sectional drawing which shows the indoor heat exchanger of the place of the II line | wire of FIG. 3, and its surrounding structure. The schematic diagram when the indoor heat exchanger which functions as an evaporator is seen from the top. The partial expanded sectional view which shows an example of the relationship between a 1st flat tube, a 2nd flat tube, and a notch. The schematic diagram which shows an example of the manufacturing process of an indoor heat exchanger. The schematic diagram which shows an example of the other manufacturing process of an indoor heat exchanger. Sectional drawing which shows typically the relationship between the component of an indoor heat exchanger, and a jig | tool. Sectional drawing for demonstrating the wall thickness of the tube wall of a 1st flat tube and a 2nd flat tube. The partial expanded sectional view of the 1st heat exchange part and the 2nd heat exchange part. The schematic diagram when the indoor heat exchanger which concerns on modification 1A is seen from the top. The schematic diagram when the other indoor heat exchanger which concerns on modification 1A is seen from the top. The figure which shows an internal structure when the indoor unit which concerns on the modification 1B is seen from the bottom. Sectional drawing of the indoor unit cut | disconnected by the II-II line | wire of FIG.

(1) Outline of Configuration of Air Conditioner FIG. 1 shows an appearance of an indoor unit to which an indoor heat exchanger according to an embodiment of the present invention is applied, and FIG. 2 shows the indoor unit of FIG. The internal structure is shown. The indoor unit 100 is a ceiling-mounted indoor unit that is used for cooling and heating a room in a building such as a building by performing a vapor compression refrigeration cycle operation. As shown in FIG. 2, the indoor unit 100 is embedded in a ceiling CE of a room such as a building. The indoor unit 100 includes an indoor fan 120 and an indoor heat exchanger 10. When the indoor fan 120 is driven, the indoor unit 100 sucks indoor air from the suction port 101 in the lower center of the indoor unit 100 and blows out air from the four outlets 102 of the indoor unit 100. The four outlets 102 of the indoor unit 100 extend in parallel to the four sides of the decorative plate 103 having a substantially square bottom surface.

  Inside the indoor unit 100, a bell mouth 104 is attached immediately above the suction port 101. The indoor air sucked from the suction port 101 is guided to the indoor fan 120 by the bell mouth 104. From the indoor fan 120, room air is blown out substantially parallel to the ceiling CE. Then, the indoor air that passes through the indoor heat exchanger 10 that surrounds the indoor fan 120 in the horizontal direction and is blown out from the indoor fan 120 is blown out from the four outlets 102 on the outer periphery of the indoor heat exchanger 10. The

  In the indoor heat exchanger 10, for example, condensation may occur when the temperature of the indoor heat exchanger 10 is lower than the indoor temperature during cooling operation. In the indoor unit 100, a drain pan 130 is provided below the indoor heat exchanger 10 in order to receive condensed water generated by condensation in the indoor heat exchanger 10. The condensed water generated in the indoor heat exchanger 10 is attracted by gravity, flows downward through the indoor heat exchanger 10, and falls from the indoor heat exchanger 10 to the drain pan 130.

(2) Indoor heat exchanger 10
The state which looked at the indoor heat exchanger 10 from the top is shown by FIG. As illustrated in FIG. 3, the indoor heat exchanger 10 surrounds the indoor fan 120. The arrows Ar1, Ar2, Ar3, Ar4 in FIG. 3 indicate the direction of air flow. Moreover, the four blower outlets 102 are formed in the direction which these arrows Ar1-Ar4 faces. The indoor heat exchanger 10 has a shape along each side of a square having a center of a diagonal line at the center of the indoor fan 120 as viewed from above. However, the location corresponding to the location where the drain pump 140 is formed is recessed on the inner peripheral side.

  The indoor heat exchanger 10 is, for example, a part of a refrigerant circuit (not shown) that performs a refrigeration cycle, and is a device that exchanges heat between refrigerant flowing through the refrigerant circuit and room air. A liquid pipe 51 and a gas pipe 52 extending from the indoor heat exchanger 10 are connected to the refrigerant circuit. A liquid refrigerant mainly flows through the liquid pipe 51 extending from the indoor heat exchanger 10, and a gas refrigerant mainly flows through the gas pipe 52.

(2-1) 1st heat exchange part 11 and 2nd heat exchange part 12
FIG. 4 shows an enlarged cross-sectional structure of a part of the indoor unit 100 cut at a location corresponding to the location of line II in FIG. As shown in FIG. 4, the indoor heat exchanger 10 includes a first heat exchange unit 11 on the inner peripheral side and a second heat exchange unit 12 on the outer peripheral side. In other words, the first heat exchange unit 11 is disposed on the leeward side, and the second heat exchange unit 12 is disposed on the leeward side. The first heat exchange unit 11 includes a plurality of first flat tubes 21 arranged in a plurality of stages and a plurality of first heat transfer fins 31 intersecting with the plurality of first flat tubes 21. The first flat tube 21 and the first heat transfer fin 31 are substantially orthogonal to each other. Although the number of the first heat transfer fins 31 shown in FIG. 4 is only one, the other first heat transfer fins 31 adjacent to the first heat transfer fins 31 shown in FIG. The first heat transfer fins 31 are arranged in parallel. However, the first heat transfer fins 31 adjacent to each other at the bent portion 10R of the indoor heat exchanger 10 are not parallel to each other, and the outer periphery is closer to the inner peripheral side interval between the first heat transfer fins 31 adjacent to each other. The side spacing is widened. In one first flat tube 21, a plurality of flow paths 21a are formed in a line from the windward side to the leeward side, and the refrigerant flows through each flow path 21a.

  The second heat exchange unit 12 includes a plurality of second flat tubes 22 arranged in a plurality of stages and a plurality of second heat transfer fins 32 intersecting with the plurality of second flat tubes 22. The second flat tube 22 and the second heat transfer fin 32 are substantially orthogonal to each other. Although the number of the second heat transfer fins 32 shown in FIG. 4 is only one, the other second heat transfer fins 32 adjacent to the second heat transfer fins 32 shown in FIG. The second heat transfer fins 32 are arranged in parallel. However, the second heat transfer fins 32 adjacent to each other at the bent portion 10 </ b> R of the indoor heat exchanger 10 are not parallel to each other, and the outer periphery is larger than the interval on the inner peripheral side of the adjacent second heat transfer fins 32. The side spacing is widened. In one second flat tube 22, a plurality of flow paths 22a are formed in a line from the windward side to the leeward side, and the refrigerant flows through each flow path 22a.

  FIG. 5 schematically shows an example of the flow direction of the refrigerant flowing through the indoor heat exchanger 10. The indoor heat exchanger 10 includes a flow divider 53 connected to the liquid pipe 51, a liquid header 54 connected to the flow divider 53, a gas header 55 connected to the gas pipe 52, and a turn-up header 56. . The indoor heat exchanger 10 shown in FIGS. 3 and 5 is configured by using two sets of first heat exchange units 11 and second heat exchange units 12. The one arranged near the drain pump 140 is called the first heat exchange unit 11 and the second heat exchange unit 12 or the first pair P1 of the first pair P1, and the remaining one is the first heat of the second pair P2. It is called the exchange unit 11 and the second heat exchange unit 12 or the second pair P2.

  In FIG. 5, the flow of the refrigerant when the indoor heat exchanger 10 functions as an evaporator is indicated by arrows Ar5 to Ar8. In the first pair P1, the liquid refrigerant that has flowed from the liquid pipe 51 into the first flat tube 21 via the flow divider 53 and the liquid header 54 flows in the direction of the arrow Ar5. Then, the refrigerant flowing through the first flat pipe 21 of the first pair P1 enters the second flat pipe 22 from the first flat pipe 21 at the turn-back header 56, flows in the direction of the arrow Ar6, and passes through the gas header 55 to the gas pipe. It flows to 52. In the second pair P2, the liquid refrigerant that has flowed from the liquid pipe 51 into the first flat tube 21 via the flow divider 53 and the liquid header 54 flows in the direction of the arrow Ar7. Then, the refrigerant flowing through the first flat tube 21 of the second pair P2 enters the second flat tube 22 from the first flat tube 21 at the turn-up header 56, flows in the direction of the arrow Ar8, and passes through the gas header 55 to the gas pipe. It flows to 52. As described above, in the indoor heat exchanger 10 shown in FIG. 5, the liquid refrigerant evaporates while flowing through the first flat tube 21 and the second flat tube 22 and changes to a gas refrigerant. The indoor heat exchanger 10 shown in FIG. 5 includes a first heat exchange unit 11 and a second heat exchange unit 12 of a first pair P1 bent into an L shape, and a second pair P2 bent into an L shape. The first heat exchange unit 11 and the second heat exchange unit 12 are combined. Note that the first pair P1 has two bent portions 10R, and the second pair P2 has only one bent portion 10R, but both shapes are classified as L-shaped.

  As described above, the first pair P1 and the second pair P2 are bent in an L shape so that the first heat exchange unit 11 and the second heat exchange unit 12 surround the indoor fan 120 on the inner peripheral side. To be able to do that. In both the first pair P 1 and the second pair P 2, the indoor air blown from the indoor fan 120 arranged on the inner peripheral side is passed through the first flat tube 21 and the second flat tube 22 along the width direction. It arrange | positions so that it can guide | lead to the outer peripheral side with the communication part 34 (refer FIG. 6) of the 2nd heat transfer fin 32 through between the fins of the 2nd heat transfer fin 32 from between the fins of the 1 heat transfer fin 31. .

(2-2) Detailed Configuration of First Heat Transfer Fin 31 FIG. 6 shows the first heat transfer fin 31 of the first heat exchange unit 11 shown in FIG. 4 and a part of the first flat tube 21 fitted therein. It is shown further enlarged. Note that the structure of the first heat exchange unit 11 shown enlarged in FIG. 6 is also common to the second heat exchange unit 12, and therefore, the first heat exchange unit 11 will be described here and the second heat exchange unit 11 will be described. The description of the same configuration as the first heat exchange unit 11 in the exchange unit 12 is omitted.

  The first heat transfer fin 31 includes a windward main part 33 in which a notch 35 into which the first flat tube 21 is inserted is formed, and a leeward communication part 34 located on the opposite side of the opening end 35 a of the notch 35. Have. The first flat tube 21 is inserted in the direction of the arrow Ar9 in FIG. Similarly, the second heat transfer fin 32 is connected to the leeward side main portion 33 in which the notch 35 into which the second flat tube 22 is inserted and the leeward side communication located on the opposite side of the opening end 35a of the notch 35. Part 34 is provided. The communication portion 34 is formed with water guiding ribs 36 that help drain the condensed water. The water guide ribs 36 are portions extending from the pressed grooves. When the water guide ribs 36 are viewed from the one main surface f1 of the first heat transfer fins 31 (or the second heat transfer fins 32), the convex structure has the water guide ribs 36. When viewed from the other main surface on the opposite side of the one main surface f1, the concave structure extends vertically along the water guiding rib 36. A plurality of cut-and-raised portions 37 protruding in a bridge shape are formed on the one main surface f1 side of the first heat transfer fin 31 (or the second heat transfer fin 32). As can be seen from FIG. 6, the cut-and-raised portion 37 is not formed around the notch 35.

(3) Bending process of components of indoor heat exchanger 10 (3-1) Outline of bending process Using FIGS. 7, 8 and 9, the indoor heat exchanger 10 shown in FIG. 3 is bent. A method for forming the portion 10R will be described. In order to form the bent portion 10R, for example, two jigs shown in FIGS. 7 and 8 are used. That is, the bent portion 10 </ b> R of the indoor heat exchanger 10 is formed using the roll jig 210 and the pressing jig 220. As shown in FIG. 7, the roll jig 210 is fixed to the one end 301 side of the component 300 of the indoor heat exchanger 10 by placing it on the place where the bent portion 10 </ b> R is to be formed. Then, the pressing jig 220 is pressed against the component 300 from the side opposite to the roll portion 211 of the roll jig 210. Further, the pressing jig 220 presses the portion closer to the other end 302 of the component 300 than the roll portion 211.

  Next, as shown in FIG. 8, a force is applied to the component 300 of the indoor heat exchanger 10 from the pressing jig 220 to bend the first flat tube 21 and the second flat tube 22 of the component 300. At the place where the bent portion 10 </ b> R is formed, the radius of curvature of the second flat tube 22 is larger than the radius of curvature of the first flat tube 21. Accordingly, when the bending process is completed, the end of the first flat tube 21 and the end of the second flat tube 22 at the other end 302 of the component 300 are shown in FIG. As described above, the end of the second flat tube 22 is designed to protrude beyond the end of the first flat tube 21 before the component 300 is bent.

  FIG. 9 shows an enlarged view of the part 300 on which the roll jig 210 and the pressing jig 220 are pressed. As can be seen from FIG. 9, the first flat tube 21 mainly contacts the roll jig 210. Although not shown in FIG. 9, a plate is inserted between the first heat exchange unit 11 and the second heat exchange unit 12 during the bending process when completed. . In other words, during the bending process, the second flat tube 22 transmits the force from the second flat tube 22 to the first heat transfer fins 31 through the plate. Similarly, the area where the pressing jig 220 contacts the second heat transfer fin 32 also has a wide area. Then, the pressure received by the second heat transfer fin 32 from the pressing jig 220 and the pressure received by the first heat transfer fin 31 from the plate are smaller than the pressure received by the first flat tube 21 from the roll jig 210. As a result, buckling of the leeward edge 31b of the first heat transfer fin 31 and the leeward edge 32b (see FIG. 11) of the second heat transfer fin 32 during bending is prevented.

(3-2) Positional relationship between flat tubes and heat transfer fins As shown in FIG. 6, the plurality of first flat tubes 21 are 0 mm from the windward edges 31 a of the plurality of first heat transfer fins 31. As described above, they are arranged on the windward side. That is, the distance D1 between the windward end of the first flat tube 21 and the windward edge 31a of the first heat transfer fin 31 shown in FIG. 6 is 0 mm or more, and there is a manufacturing error, for example. Considering this, the distance D1 is preferably set to 0.5 mm or more. As already described, in order to reduce the force applied to the first heat transfer fins 31 during bending, it is preferable that the first flat tube 21 protrudes.

  Further, during bending, a force is applied to the first flat tube 21 from the roll jig 210, and a force is applied to the second flat tube 22 from a plate sandwiched between the first flat tube 21 and the second flat tube 22. . The wall thickness of the tube wall of the 1st flat tube 21 and the 2nd flat tube 22 is set in consideration of the force which these apply. Specifically, as shown in FIG. 10, the first flat tube 21 and the second flat tube 22 have the wall thickness t3 of the tube walls 21d and 22d in the windward portion located on the windward side. It is thicker than the wall thickness t <b> 2 of the tube walls 21 c and 22 c at the side portions located in the step direction of the flat tube 21 and the second flat tube 22. Note that the wall thickness t3 of the tube walls 21d and 22d in the windward portion located on the windward side than the wall thickness t1 of the inner walls 21b and 22b that separate the flow paths of the first flat tube 21 and the second flat tube 22 having multiple holes Is thicker.

  FIG. 11 shows a part of the first heat exchange unit 11 and the second heat exchange unit 12 in an enlarged manner. The first heat exchanging portion 11 has a gap CL formed between the leeward edge 31b of the first heat transfer fin 31 and the main portion 33 on the upwind side of the second heat transfer fin 32 of the second heat exchange portion 12. 2. It is comprised so that it may not contact with the heat exchange part 12. FIG. More specifically, in the first heat exchange unit 11, the leeward edges 31b of the plurality of first heat transfer fins 31 extend linearly in the vertical direction along the gap CL. The distance D3 between the leeward edge 31b of the first heat transfer fin 31 and the windward edge 32a of the second heat transfer fin 32 is preferably ensured by 2 mm or less.

  In addition, as shown in FIG. 6, the plurality of second flat tubes 22 are arranged to be located 0 mm or more on the windward side of the windward edges 32 a of the plurality of second heat transfer fins 32. That is, the distance D2 between the windward end of the second flat tube 22 and the windward edge 32a of the second heat transfer fin 32 shown in FIG. 6 is 0 mm or more, and the condensed water has surface tension. Is preferably set to 2 mm or less in order to make it easy to flow down. This 2 mm takes into account the size of the water droplets. If this is 2 mm or more, the water droplets are hardly attracted by surface tension (capillary phenomenon). Further, in order to reduce the force applied to the second heat transfer fins 32 during bending, the second flat tubes 22 are projected (the second flat tubes 22 are windward of the second heat transfer fins 32). It is preferable that the edge 32a protrudes more than 0 mm and is located on the windward side.

(4) Modification (4-1) Modification 1A
In the above embodiment, the indoor heat exchanger 10 combines the first pair P1 and the second pair bent in an L shape when viewed from the step direction of the first flat tube 21 and the second flat tube 22, The case where it is configured to surround the entire circumference of the windward space where the fan 120 is arranged has been described as an example. However, the shape of the indoor heat exchanger 10 for enclosing the windward space where the indoor fan 120 is disposed is, for example, as shown in FIG. 12 or FIG. 12 when viewed from the step direction of the first flat tube 21 and the second flat tube 22. It may be a square shape as shown in FIG.

  In FIG. 12, the flow of the refrigerant when the square indoor heat exchanger 10 functions as an evaporator is indicated by arrows Ar11 and Ar12. The liquid refrigerant that has flowed from the liquid pipe 51 into the first flat tube 21 via the flow divider 53 and the liquid header 54 flows in the direction of the arrow Ar11. The refrigerant flowing through the first flat tube 21 enters the second flat tube 22 from the first flat tube 21 at the folding header 56, flows in the direction of the arrow Ar 12, and flows to the gas pipe 52 via the gas header 55.

FIG. 13 shows the flow of the refrigerant when the square indoor heat exchanger 10 functions as an evaporator. The refrigerant flows in the first flat tube 21 of the first heat exchange unit 11 with arrows Ar12 and Ar14 and second heat exchange. The second flat tube 22 of the portion 12 is indicated by arrows Ar13 and Ar15. The liquid refrigerant flowing from the liquid pipe 51 into the first flat tube 21 via the flow divider 53 and the liquid header 54 is indicated by the arrows Ar12. It flows in the direction of Ar13. The refrigerant flowing through the first flat tube 21 flows in the directions of arrows Ar14 and Ar15, and flows to the gas pipe 52 via the gas header 55 .

(4-2) Modification 1B
Although the said embodiment demonstrated the case where the indoor heat exchanger 10 encloses the perimeter of the indoor fan 120, the structure which a part of circumference | surroundings of an indoor fan is not enclosed may be sufficient. When viewed from the step direction of the first flat tube 21 and the second flat tube 22, for example, a C shape as shown in FIGS. 14 and 15 may be used.

  FIG. 14 shows the internal structure of the indoor unit 100 as viewed from below, and FIG. 15 shows a cross-sectional structure taken along line II-II in FIG. The indoor unit 100 includes an indoor fan 120 and an indoor heat exchanger 10. The C-shaped indoor heat exchanger 10 is a portion indicated by hatching. When the indoor fan 120 is driven, the indoor unit 100 sucks room air from the suction port 101 in the lower center of the indoor unit 100 and blows air from the outlet 102 of the indoor unit 100.

  Inside the indoor unit 100, a bell mouth 104 is attached immediately above the suction port 101. The indoor air sucked from the suction port 101 is guided to the indoor fan 120 by the bell mouth 104. The indoor fan 120 substantially blows out indoor air in the horizontal direction. And the indoor air which passed the indoor heat exchanger 10 which encloses the indoor fan 120 in a C shape in a horizontal direction, and was blown off from the indoor fan 120 is blown off from the blower outlet 102.

  In the indoor heat exchanger 10, for example, condensation may occur when the temperature of the indoor heat exchanger 10 is lower than the indoor temperature during cooling operation. In the indoor unit 100, a drain pan 130 is provided below the indoor heat exchanger 10 in order to receive condensed water generated in the indoor heat exchanger 10. The condensed water generated in the indoor heat exchanger 10 is attracted by gravity, flows downward through the indoor heat exchanger 10, and falls from the indoor heat exchanger 10 to the drain pan 130.

(4-3) Modification 1C
The refrigerant flowing through the first flat tube 21 and the second flat tube 22 of the above embodiment may be other than a vapor compressor type refrigerant, for example, water.

(4-4) Modification 1D
In the indoor heat exchanger 10 of the present embodiment, the heat exchange unit has two rows of the first heat exchange unit 11 and the second heat exchange unit 12, but the present invention can also be applied to an indoor heat exchanger having three or more rows.

(4-5) Modification 1E
The indoor heat exchanger according to the present invention can be applied not only to the ceiling-embedded indoor unit 100 but also to, for example, a ceiling-suspended indoor unit.

(4-6) Modification 1F
In the said embodiment, although the 1st flat tube 21 and the 2nd flat tube 22 are arranged side by side at the same height, arrangement | positioning of the 1st flat tube and the 2nd flat tube of the indoor heat exchanger which concerns on this invention is the arrangement | positioning. A staggered arrangement may also be used.

(5) Features (5-1)
As described above, the notches 35 of the first heat transfer fins 31 and the second heat transfer fins 32 are arranged on the inner side, and the first flat tube 21 and the second flat tube 22 are bent inward. Deformation of the main portion 33 of the first heat transfer fin 31 and the main portion 33 of the second heat transfer fin 32 is suppressed. The deformation of the main portion 33 of the first heat transfer fin 31 and the main portion 33 of the second heat transfer fin 32 is suppressed, and the ventilation resistance is not increased by the deformation, and the increase of the ventilation resistance is suppressed.

  Moreover, since the communication part 34 of the 1st heat transfer fin 31 and the 2nd heat transfer fin 32 is arrange | positioned in the leeward side, it is carried by the indoor air which flows into the width direction of the 1st flat tube 21 and the 2nd flat tube 22. The condensed water can be made to flow in the up and down direction through the communicating portion 34, particularly the water guiding rib 36. Thus, the drainage property at the time of dew condensation improves by the communicating part 34 of the 1st flat tube 21 and the 2nd flat tube 22 in the leeward side.

(5-2)
In the above embodiment, as shown in FIG. 5, the indoor heat exchanger 10 has the first pair P <b> 1 and the second pair P <b> 2 bent into an L shape so that the indoor fan 120 can be enclosed on the inner peripheral side. Yes. Moreover, in the modification 1A, the indoor heat exchanger 10 shown by FIG.12 and FIG.13 is bent by the square shape so that the indoor fan 120 can be enclosed on the inner peripheral side. Furthermore, in the modified example 1B, the indoor heat exchanger 10 shown in FIG. 14 is bent in a C shape so that the indoor fan 120 can be enclosed on the inner peripheral side. With such a configuration, the indoor air blown out from the indoor fan 120 arranged on the inner peripheral side of the plurality of first heat transfer fins 31 along the width direction of the first flat tube 21 and the second flat tube 22. It passes through between the fins of the plurality of second heat transfer fins 32 from between the fins and is led out to the outer peripheral side where the communication portion 34 of the second heat transfer fin 32 is located. As a result, in the indoor heat exchanger 10, drainage of the condensed water is improved by efficiently utilizing the air flow blown out by the indoor fan 120.

(5-3)
As described with reference to FIG. 6, the first flat tubes 21 are positioned at the windward side of 0 mm or more from the windward edges 31 a of the plurality of first heat transfer fins 31, for example, the first heat exchange unit 11 and When the second heat exchanging portion 12 is bent, the first flat tube 21 protruding to the leeward side by 0 mm or more from the windward edge 31a of the first heat transfer fin 31 hits a member such as the roll jig 210 first, The buckling of the windward edge 31a of the first heat transfer fin 31 is prevented. As a result, an increase in ventilation resistance due to deformation of the windward edges 31a of the plurality of first heat transfer fins 31 can be suppressed.

(5-4)
As shown in FIG. 10, when the wall thickness tt3 of the tube walls 21d and 22d in the windward portion located on the windward side is thicker than the wall thickness t2 of the tube walls 21c and 22c in the side surface portion, the first flat tube 21 and the first When the 2 flat tube 22 is bent, the first flat tube 21 and the second flat tube 22 are not easily deformed. As a result, it is possible to suppress a decrease in the pressure resistance of the first flat tube 21 and the second flat tube 22 at the portion bent toward the inner peripheral side of the indoor heat exchanger 10.

(5-5)
A gap CL is formed between the leeward edge 31b of the first heat transfer fin 31 and the windward main portion 33 of the second heat transfer fin 32 shown in FIG. By being configured so that the heat exchange unit 12 does not come into contact, heat conduction from one of the first heat exchange unit 11 and the second heat exchange unit 12 having a temperature difference to the other can be suppressed. . As a result, it is possible to suppress the heat exchange performance between the first heat exchange unit 11 and the second heat exchange unit 12 from being deteriorated due to heat conduction between the first heat exchange unit 11 and the second heat exchange unit 12. .

(5-6)
As shown in FIG. 11, the second flat tubes 22 are positioned at the windward side of 0 mm or more from the windward edges 32 a of the plurality of second heat transfer fins 32, so that the first heat exchange unit 11 and the second heat exchange unit 11 It becomes easy to maintain the clearance CL between the heat exchange parts 12. The clearance CL maintained by this arrangement of the second flat tubes 22 makes it easy to prevent the performance of heat exchange between the first heat exchange unit 11 and the second heat exchange unit 12 from being deteriorated.

(5-7)
As shown in FIG. 11, the second flat tube 22 is located 2 mm or less above the windward edge of the plurality of second heat transfer fins, so that the first heat exchange unit 11 and the second heat A gap CL of 2 mm or less can be reliably formed between the exchange parts 12. That is, the distance D3 between the leeward edge 31b of the first heat transfer fin 31 and the windward edge 32a of the second heat transfer fin 32 is 2 mm or less. Condensed water is attracted by the surface tension in a gap of 2 mm or less formed between the first heat exchange unit 11 and the second heat exchange unit 12 and easily flows down. As a result, the drainage performance of the condensed water in the indoor heat exchanger 10 is improved.

(5-8)
As shown in FIG. 11, the leeward edges 31b of the plurality of first heat transfer fins 31 extend linearly along the gap CL in the vertical direction, so that the condensed water can be easily guided along the leeward edge 31b. As a result, it is possible to suppress the occurrence of problems due to condensed water, such as scattering of condensed water.

(5-9)
As shown in FIG. 5, the first heat exchanging part 11 and the second heat exchanging part 12 are two sets of L-shaped first pair P1 and second pair P2, and the square type 1 shown in FIGS. Around the windward space in the first heat exchange section 11 and the second heat exchange section 12 in the set or in the one set of the first heat exchange section and the second heat exchange section in the C shape shown in FIG. Can be enclosed. As a result, the configuration of the indoor unit 100 to which the indoor heat exchanger 10 is applied can be simplified.

DESCRIPTION OF SYMBOLS 10 Indoor heat exchanger 11 1st heat exchange part 12 2nd heat exchange part 21 1st flat tube 21b, 21c, 21d Tube wall 22 2nd flat tube 22b, 22c, 22d Tube wall 31 1st heat transfer fin 31a Windward Edge 31b Windward edge 32 Second heat transfer fin 32a Windward edge 32b Windward edge 33 Main part 34 Communication part 35 Notch

International Publication No. 08/41656 Pamphlet International Publication No. 13/160957 Pamphlet

Claims (9)

A plurality of first flat tubes (21) arranged in a plurality of stages and a plurality of first heat transfer fins (31) intersecting with the first flat tubes, the indoor air flowing in the width direction of the first flat tubes and the first A first heat exchange section (11) for performing heat exchange with the refrigerant flowing in the flat tube,
A plurality of second flat tubes (22) arranged in a plurality of stages and a plurality of second heat transfer fins (32) intersecting the second flat tubes, and the indoor air flowing in the width direction of the second flat tubes and the second A second heat exchange section (12) for exchanging heat with the refrigerant flowing in the flat tube,
With
The first heat transfer fin and the second heat transfer fin include a windward main portion (33) in which a notch (35) for inserting the first flat tube and the second flat tube is formed, and the cut The leeward side communication part (34) located on the opposite side of the opening end of the notch,
The first heat exchange part and the second heat exchange part are juxtaposed so that the first flat tube and the second flat tube of each stage are arranged in the width direction, the windward side is the inner peripheral side, and the leeward side is An indoor heat exchanger that is bent to the outer periphery. The first heat exchange part and the second heat exchange part are bent so as to enclose the indoor fan (120) on the inner peripheral side, and the indoor air blown out from the indoor fan arranged on the inner peripheral side The second heat transfer fins pass through between the fins of the plurality of second heat transfer fins from between the fins of the plurality of first heat transfer fins along the width direction of the first flat tube and the second flat tube. Arranged so that it can be led out to the outer peripheral side with the communication part,
The indoor heat exchanger according to claim 1. The plurality of first flat tubes are arranged to be located 0 mm or more on the windward side of the windward edges (31a) of the plurality of first heat transfer fins,
The indoor heat exchanger according to claim 1 or 2. The plurality of first flat tubes and the plurality of second flat tubes have a wall thickness (21d, 22d) of the windward portion located on the windward side so that the first flat tube and the second flat tube are thick. It is thicker than the wall thickness of the side wall portion (21c, 22c) located in the step direction of the tube,
The indoor heat exchanger according to claim 3. The first heat exchanging portion includes a plurality of the leeward edges (31b) of the first heat transfer fins of the first heat exchange portion and the main portion on the leeward side of the second heat transfer fin of the second heat exchange portion. A gap is formed between the second heat exchanging part and the second heat exchange part.
The indoor heat exchanger according to any one of claims 1 to 4. The second flat tube is disposed on the windward side by 0 mm or more from the windward edge (32a) of the plurality of second heat transfer fins,
The indoor heat exchanger according to claim 5. The second flat tube is disposed on the windward side by 2 mm or less from the windward edge of the plurality of second heat transfer fins,
The indoor heat exchanger according to claim 6. In the first heat exchange unit, the leeward edges of the plurality of first heat transfer fins extend linearly along the gap in the vertical direction.
The indoor heat exchanger according to any one of claims 5 to 7. The first heat exchange part and the second heat exchange part are bent into an L shape, a C shape or a square shape when viewed from the step direction of the first flat tube and the second flat tube,
The indoor heat exchanger according to any one of claims 1 to 8.

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