Indoor heat exchanger unit and air conditioner indoor unit

Abstract

This indoor heat exchanger unit comprises: a plurality of fins arranged at intervals in one direction; heat transfer pipes passing through the plurality of fins, the heat transfer pipes having turn-back parts that turn back at end sections in the one direction; and heat-exchanger-holding components provided to the one-direction end sections of the heat transfer pipes, the heat-exchanger-holding components having a plate-form holder substrate in which are formed insertion holes into which the turn-back parts are inserted. The heat-exchanger-holding components also have hooks for holding upper sections of the turn-back parts, the hooks being provided to upper edge sections of the insertion holes and protruding from a second surface of the holder substrate, the second surface being on the opposite side of the holder substrate from a first surface facing the fins. The insertion holes each include: a piping region in which the turn-back parts held by the hooks are positioned, the piping region having a rounded-corner rectangular shape; and a drainage hole that is allowed to communicate with the piping region and is located below the piping region.

Description

Indoor heat exchanger unit and indoor unit of air conditioner

[0001] The present disclosure relates to an indoor heat exchanger unit including a heat exchanger holding component that is attached to a side of an indoor heat exchanger to support a heat transfer tube, and an indoor unit of an air conditioner.

[0002] For example, in a wall-mounted air conditioner indoor unit, a housing includes a heat exchanger that surrounds a blower, and a heat exchanger holder (hereinafter also referred to as a holder) that is attached to the horizontal ends of the heat exchanger and fixes the shape of the heat exchanger by fixing the angle between the heat exchanger sections (see, for example, Patent Document 1). The heat exchanger of the indoor unit disclosed in Patent Document 1 includes a front heat exchange section and a rear heat exchange section that are arranged in front of and behind the blower, and each heat exchange section has a plurality of fins arranged in the horizontal direction and a serpentine heat transfer tube that penetrates the plurality of fins. The holder in Patent Document 1 is located at the left end of the heat exchanger, and the left folded portions of the heat transfer tubes of the front heat exchange section and the rear heat exchange section are inserted into a plurality of insertion holes formed in a plate-shaped holder base of the holder, thereby fixing the positions and angles of the heat exchange sections relative to each other and fixing the overall shape of the heat exchanger. In addition, the holder of Patent Document 1 has a cylindrical wall portion that stands upright on the left side from the edge of the entire circumference of the insertion hole, and this wall portion surrounds the folded portion of the heat transfer tube, thereby regulating the orientation of the folded portion.

[0003] International Publication No. 2020 / 165970

[0004] Since a refrigerant flows through the heat transfer tube, condensation occurs on the heat transfer tube and the holder that comes into contact with the heat transfer tube. In the holder of Patent Document 1, a wall portion is provided around the entire circumference of the holder base, including the lower edge of the insertion hole, and dew pools form inside this cylindrical wall portion. If dew pools form inside the wall portion, the folded portion of the heat transfer tube may remain in contact with the condensation in the dew pool, which may cause corrosion of the heat transfer tube.

[0005] The present disclosure has been made to solve the above-mentioned problems, and provides an indoor heat exchanger unit and an indoor unit of an air conditioner that can suppress corrosion of heat transfer tubes due to condensation water remaining on the heat exchanger holding parts (holders).

[0006] The indoor heat exchanger unit of the present disclosure comprises a plurality of fins arranged at intervals in one direction, a heat transfer tube that penetrates the plurality of fins and has a folded portion that folds back at the end in the one direction, and a heat exchanger holding component having a plate-shaped holder substrate that is provided at the end in the one direction of the heat transfer tube and has an insertion hole into which the folded portion is inserted, wherein the heat exchanger holding component has a hook that protrudes from a second surface of the holder substrate opposite to a first surface that faces the fins and is provided at the upper edge of the insertion hole and holds the upper part of the folded portion, and the insertion hole includes a piping area having a rounded rectangular shape in which the folded portion held by the hook is arranged, and a drainage hole provided below the piping area and communicating with the piping area.

[0007] In addition, the indoor unit of the air conditioner according to the present disclosure comprises the above-mentioned indoor heat exchanger unit and a blower that supplies indoor air to the indoor heat exchanger constituted by the plurality of fins and the heat transfer tubes of the indoor heat exchanger unit, the indoor heat exchanger being constituted by a plurality of heat exchange sections arranged along the outer peripheral surface of the blower, and the heat exchanger holding part supporting the heat transfer tubes at the ends of the plurality of heat exchange sections in one direction.

[0008] In the indoor heat exchanger unit and air conditioner indoor unit of the present disclosure, the hooks for holding the folded portion of the heat transfer tube are provided on the upper edge of the insertion hole, and the insertion hole is provided with a drain hole below the piping area. As a result, condensation water generated at the folded portion flows downward from the hooks by gravity and is drained out of the heat exchanger holding component through the drain hole, making it difficult for condensation to accumulate. This prevents corrosion of the heat transfer tube due to condensation water remaining in the heat exchanger holding component.

[0009] 1 is a perspective view showing the appearance of an indoor unit of an air conditioner according to a first embodiment of the present disclosure. It is a cross-sectional view showing the internal configuration of the indoor unit of FIG. 1. It is an exploded perspective view showing the configuration of the indoor unit of FIG. 1. It is a perspective view showing the configuration of the indoor heat exchanger unit of FIG. 3. It is a refrigerant circuit diagram of an air conditioner equipped with the indoor unit of FIG. 1. It is a plan view of the indoor heat exchanger unit of FIG. 4. It is a cross-sectional view of the A-A cross section of the indoor heat exchanger unit of FIG. 6, viewed from the right side. It is a side view of the indoor heat exchanger unit of FIG. 4, viewed from the left side. It is an enlarged view of a portion Q of the indoor heat exchanger unit of FIG. 8. It is a partial perspective view showing the configuration of a portion Q of the indoor heat exchanger unit of FIG. 8. It is a cross-sectional view of the B-B cross section of the indoor heat exchanger unit of FIG. 9, viewed from the front. It is a cross-sectional view of the C-C cross section of the indoor heat exchanger unit of FIG. 9, viewed from the rear side.

[0010] Hereinafter, embodiments of an indoor unit of an air conditioner according to the present disclosure will be described with reference to the drawings. Note that the present disclosure is not limited to the following embodiments, and various modifications are possible without departing from the spirit of the present disclosure. In addition, in each drawing, the same reference numerals denote the same or equivalent parts, and this is common throughout the entire specification. Note that in each drawing, the relative dimensional relationships or shapes of each component may differ from those in reality.

[0011] Embodiment 1. Fig. 1 is a perspective view showing the appearance of an indoor unit 10A of an air conditioner (hereinafter also simply referred to as indoor unit 10A) according to Embodiment 1 of the present disclosure. Fig. 2 is a cross-sectional view showing the internal configuration of indoor unit 10A of Fig. 1. In Fig. 2, the flow of indoor air drawn into indoor unit 10A is indicated by outline arrow F1, and the flow of conditioned air is indicated by outline arrow F2. Fig. 3 is an exploded perspective view showing the configuration of indoor unit 10A of Fig. 1. Fig. 4 is a perspective view showing the configuration of indoor heat exchanger unit 3 of Fig. 3. Below, the schematic configuration of indoor unit 10A will be described based on Figs. 1 to 4.

[0012] In the following description, terms indicating directions (such as "up," "down," "right," "left," "front," and "rear") are used as appropriate to facilitate understanding, but these are for explanatory purposes only and do not limit the present disclosure. Furthermore, unless otherwise specified, these directional terms refer to the directions when the indoor unit 10A is viewed from the side of the front panel 8. In the drawings, the arrow Y direction represents the front-to-rear direction of the indoor unit 10A, the arrow X direction represents the lateral direction, i.e., left-to-right direction, of the indoor unit 10A, and the arrow Z direction represents the up-down direction of the indoor unit 10A.

[0013] (Configuration of indoor unit 10A) As shown in Fig. 1, the indoor unit 10A is a wall-mounted indoor unit that is installed on, for example, a wall inside a room. As shown in Fig. 2 and Fig. 3, the indoor unit 10A includes a rear case 2, an indoor heat exchanger unit 3, a blower 17, an air outlet structure 6, a design case 7, a front panel 8, etc. As shown in Fig. 3, the indoor heat exchanger unit 3 includes an indoor heat exchanger 15 and a plate-shaped heat exchanger holder component 40 attached to the end of the indoor heat exchanger 15 in the horizontal direction (direction of arrow X).

[0014] As shown in Fig. 1, the rear case 2 and the decorative case 7 form the outer shell of the indoor unit 10A (hereinafter also referred to as the housing 1). As shown in Figs. 2 and 3, an indoor air intake 7a is provided at the top of the housing 1, and an air outlet 7b is provided at the front lower part of the housing 1 for conditioned air generated by heat exchange between the indoor air and the indoor heat exchanger 15. An air passage P is formed inside the indoor unit 10A, connecting the intake 7a and the air outlet 7b.

[0015] A filter 90 is provided on the top of the indoor unit 10A to remove dust from the indoor air drawn into the housing 1 through the air inlet 7a. As shown in Fig. 3, the indoor unit 10A also includes an automatic cleaning mechanism 9 for the filter 90, and an electrical equipment box 5 that houses various electrical components required for operating the indoor unit 10A.

[0016] 2 and 3, the rear case 2 has a rear portion 21 that is attached to the wall inside the room, and an air passage component 22 that is provided at the lower front of the rear portion 21 and that constitutes part of the air passage P. The air passage component 22 of the rear case 2 has a cross section that is curved, such as a substantially arc-shaped, and forms the rear side of the air passage. A bucket-shaped rear drain pan 22u is formed on the upper part of the air passage component 22. The rear drain pan 22u collects condensation that occurs during operation of the indoor unit 10A and drips from the rear portion of the indoor heat exchanger 15.

[0017] 3, a fan support section 23 is provided on the lower front side of the rear section 21. The fan support section 23 is made up of a pair of opposing plate-shaped members extending forward from the left and right sides of the air-path forming member 22. The fan support section 23 rotatably supports the fan shaft 17a of the blower 17. The right plate-shaped member 23a constituting the fan support section 23 has a substantially circular shape, while the left plate-shaped member 23b constituting the fan support section 23 has a circular shape with the front half missing. An arc-shaped recess 23br is formed in the front edge of the left plate-shaped member 23b, in which the fan shaft 17a is disposed.

[0018] The design case 7 is fixed to the rear case 2 with screws. As shown in FIG. 2 , a front opening 71o is provided on the front of the design case 7, and an air outlet 7b is provided on the lower front side of the design case 7. The front panel 8 is attached to the design case 7 and covers the front opening 71o on the front of the design case 7 in an openable and closable manner. The front panel 8 is configured to be fixed to shafts (not shown) on the upper left and right sides of the design case 7, for example, and may be detachable from the design case 7. An indoor heat exchanger 15, a blower 17, and an air outlet structure 6 are arranged between the rear case 2 and the design case 7.

[0019] As shown in Figure 3, the design case 7 has a left side surface portion 72 that forms the left side surface of the indoor unit 10A, and a right side surface portion 73 that forms the right side surface of the indoor unit 10A. The design case 7 also has a front frame portion 71 (see Figure 2) that connects the front ends of the left side surface portion 72 and the right side surface portion 73, an upper left surface portion 74 that extends to the right from the upper end of the left side surface portion 72, and an upper right surface portion 75 that extends to the left from the upper end of the right side surface portion 73.

[0020] As shown in Figure 2, when viewed from the side of the designer case 7, the front frame portion 71 of the designer case 7 has an L-shape that opens at an obtuse angle. Specifically, the front frame portion 71 has an upper front frame portion 71a that is substantially parallel to the rear portion 21 of the rear case 2 and an inclined lower frame portion 71b that extends rearward from the lower end of the upper front frame portion 71a. A front opening 71o that is covered by the front panel 8 is provided in the upper front frame portion 71a of the front frame portion 71, and an air outlet 7b is provided in the inclined lower frame portion 71b of the front frame portion 71. Furthermore, as shown in Figures 2 and 3, the upper end, upper left surface portion 74, and upper right surface portion 75 of the front frame portion 71 of the designer case 7 and the upper end of the rear portion 21 of the rear case 2 form an indoor air intake port 7a.

[0021] As shown in Fig. 2, the air outlet structure 6 is disposed at the front lower portion of the indoor unit 10A. The air outlet structure 6 has a drain pan 61. The drain pan 61 receives condensation water that occurs during operation of the indoor unit 10A and drips from the front portion of the indoor heat exchanger 15, and is provided below the indoor heat exchanger 15. The drain pan 61 is formed in a gutter shape.

[0022] The underside 61b of the drain pan 61 constitutes part of the air duct P and has the function of guiding the conditioned air to the air outlet 7b after passing through the indoor heat exchanger 15. Of the air duct P connecting the air inlet 7a and the air outlet 7b, the air duct portion on the air outlet 7b side is formed on the front side by the underside 61b of the drain pan 61 and on the rear side by the air duct component 22 of the rear case 2.

[0023] The air outlet structure 6 also has a plurality of airflow direction vanes 63 that adjust the direction of air blown out from the air outlet 7b into the room. The plurality of airflow direction vanes 63 are driven by an airflow direction vane motor (not shown). In the example of Fig. 2, the air outlet structure 6 has a plurality of left and right airflow direction vanes 63a and two upper and lower airflow direction vanes 63b, and when the indoor unit 10A is not operating, the air outlet 7b is covered by the two upper and lower airflow direction vanes so that the inside of the air duct P is not visible to the user.

[0024] As shown in Fig. 2, the indoor heat exchanger unit 3, blower 17, and air outlet structure 6 are mounted on the rear case 2. As shown in Fig. 3, the blower 17 is configured as, for example, a crossflow fan or a cross-flow fan, and has a fan shaft 17a which is a rotation shaft. The blower 17 is disposed inside the indoor unit 10A such that the fan shaft 17a is rotatably supported by a fan support portion 23 of the rear case 2, and extends in the lateral direction of the indoor unit 10A. Although not shown, the blower 17 has a fan motor that rotates the fan shaft 17a.

[0025] 2 and 3 , the indoor heat exchanger 15 includes a plurality of plate-shaped fins 31 and a plurality of heat transfer tubes 32 through which a refrigerant flows. The fins 31 are arranged horizontally (in the direction of arrow X) at intervals, and the heat transfer tubes 32 penetrate the horizontally arranged fins 31. Each fin 31 has a plurality of through holes 31h into which the heat transfer tubes 32 are inserted. The through holes 31h have, for example, a circular shape. The indoor heat exchanger 15 is attached to the rear case 2 via a heat exchanger holder 40 and is disposed along the outer circumferential surface of the blower 17.

[0026] Here, as shown in Figures 2 and 4, the indoor heat exchanger 15 is defined as having multiple heat exchange sections. As shown in Figure 2, the indoor heat exchanger 15 has a front heat exchange section 30f that is L-shaped with an obtuse angle and opens rearward in a side view, and an I-shaped rear heat exchange section 30b. Specifically, the front heat exchange section 30f is composed of a front surface 30f1 extending in the vertical direction and an inclined wall section 30f2 that extends upward and rearward from the upper end of the front surface 30f1. The rear heat exchange section 30b is configured to extend downward and rearward from the rear end of the inclined wall section 30f2 of the front heat exchange section 30f. That is, when the indoor heat exchanger 15 is disposed in the housing 1 as shown in Figure 2, the front, top, and upper rear sides of the blower 17 are covered by the L-shaped front heat exchange section 30f and the I-shaped rear heat exchange section 30b. Hereinafter, the front heat exchange section 30f and the rear heat exchange section 30b may be referred to as the heat exchange section 30 without distinction.

[0027] The shapes of the heat exchange sections 30, the shape of the indoor heat exchanger 15, and the surface of the blower covered by the indoor heat exchanger 15 are not limited to the above. For example, the indoor heat exchanger 15 may be configured in an inverted V shape by an I-shaped front heat exchange section 30f and an I-shaped rear heat exchange section 30b in a side view, and may cover the upper front, top, and upper back surfaces of the blower 17.

[0028] As shown in FIG. 4, the indoor heat exchanger 15 has a refrigerant pipe 18a that connects the heat transfer tubes 32 of the front heat exchange section 30f and the heat transfer tubes 32 of the rear heat exchange section 30b.

[0029] By configuring the indoor heat exchanger 15 with multiple heat exchange sections 30, for example, and giving the indoor heat exchanger 15 a curved shape that fits along the outer peripheral surface of the blower 17, it is possible to increase the heat exchange area of ​​the indoor heat exchanger 15 that comes into contact with the indoor air that flows in from the air inlet 7a of the indoor unit 10A, compared to when the indoor heat exchanger 15 is configured with a single heat exchange section 30 that is I-shaped in side view. In other words, the performance and capacity of the indoor heat exchanger 15 are improved.

[0030] As shown in Figure 4, the heat exchanger holding component 40 is attached to the lateral ends of the multiple heat exchange sections 30 that make up the indoor heat exchanger 15. The heat exchanger holding component 40 holds the heat transfer tubes 32 of the multiple heat exchange sections 30 so that the positions of the multiple heat exchange sections 30 and the angles between the heat exchange sections 30 are predetermined. The heat exchanger holding component 40 is attached to the indoor heat exchanger 15 and fixed to the rear case 2 (see Figure 2). The heat exchanger holding component 40 is made of, for example, resin. Note that the heat exchanger holding component 40 may also be made of a sheet metal component.

[0031] In the example of Figure 3, the heat exchanger holding part 40 is attached to the left end of the indoor heat exchanger 15 and is screwed to the fan support part 23 on the left side of the rear case 2. When the indoor heat exchanger unit 3 is attached to the rear case 2, the heat exchanger holding part 40 faces the left side surface part 72 of the design case 7. Note that the heat exchanger holding part 40 may also be attached to the right end of the lateral ends of the indoor heat exchanger 15. The detailed structure of the heat exchanger holding part 40 and the attachment position of the heat exchanger holding part 40 on the indoor heat exchanger 15 will be described later.

[0032] 2, the indoor unit 10A draws indoor air through the intake port 7a at the top of the indoor unit 10A by driving the blower 17, exchanges heat with the indoor heat exchanger 15 to produce cool air or warm air (i.e., conditioned air), and then blows the cool air or warm air into the room through the outlet port 7b at the front bottom of the indoor unit 10A. This cools or heats the room.

[0033] The filter 90 shown in FIG. 1 is detachably mounted on the indoor unit 10A. As shown in FIG. 3, the automatic cleaning mechanism 9 is disposed at the air inlet 7a at the top of the indoor unit 10A and includes a lattice-shaped filter support portion 91 that supports the filter 90, a collection mechanism (not shown) that collects dust adhering to the filter 90, and a dust box 92 that stores the dust. The filter 90 is supported by the filter support portion 91 and disposed between the air inlet 7a at the top of the housing 1 and the indoor heat exchanger 15, covering the top side of the indoor heat exchanger 15. The collection mechanism (not shown) is composed of, for example, a dust collection motor that moves the filter 90 and a brush that contacts the top surface of the filter 90 while it is moving. The automatic cleaning mechanism 9 is attached to the rear case 2, for example, by hooking a hook provided at the rear end of the filter support portion 91 into a hole provided at the top of the rear case 2, and is fixed to the indoor heat exchanger unit 3 attached to the rear case 2 with screws. The dust box 92 is disposed in front of the indoor heat exchanger 15 and can be freely attached and detached through the front opening 71o of the design case 7 when the front panel 8 is open.

[0034] The electrical component box 5 houses various electrical components that drive, for example, the above-mentioned fan motor, air direction motor, and dust collection motor. The electrical component box 5 is fixed with screws to the air outlet structure 6 and the automatic cleaning mechanism 9, and the decorative case 7 is fixed with screws to the automatic cleaning mechanism 9 and the electrical component box 5. The electrical component box 5 is disposed inside the indoor unit 10A in the spaces between the air outlet structure 6 and the automatic cleaning mechanism 9 and the front panel 8, and in the space between the automatic cleaning mechanism 9 and the right side portion 73 of the decorative case 7.

[0035] As described above, the filter 90 is disposed between the air inlet 7a of the design case 7 and the indoor heat exchanger 15, i.e., on the upwind side of the indoor heat exchanger 15. Therefore, when indoor air is drawn into the indoor unit 10A by the blower 17, the filter 90 removes dust from the indoor air, preventing the dust from adhering to the indoor heat exchanger 15. Dust that has adhered to the filter 90 is then removed from the filter 90 by the collection mechanism of the automatic cleaning mechanism 9 and accumulated in the dust box 92. Because the dust box 92 is detachable, the user can remove the dust box 92 from the indoor unit 10A to discard the dust and ensure space for collecting the dust.

[0036] (Configuration of Air Conditioner 100) Figure 5 is a refrigerant circuit diagram of an air conditioner 100 equipped with the indoor unit 10A of Figure 1. Solid arrows in Figure 5 indicate the direction of refrigerant flow during heating operation, and dashed arrows indicate the direction of refrigerant flow during cooling operation. As shown in Figure 5, the air conditioner 100 is a device that adjusts indoor air and is equipped with an indoor unit 10A and an outdoor unit 10B. The outdoor unit 10B is equipped with, for example, a compressor 11, a flow path switching device 12, an outdoor heat exchanger 13, an outdoor blower 16, and an expansion section 14. The indoor unit 10A is equipped with, for example, an indoor heat exchanger 15 and a blower 17.

[0037] The refrigerant circuit RC is configured by connecting the compressor 11, the flow switching device 12, the outdoor heat exchanger 13, the expansion section 14, and the indoor heat exchanger 15 via refrigerant piping 18. The compressor 11 draws in low-temperature, low-pressure refrigerant, compresses it, and discharges it as high-temperature, high-pressure refrigerant. The flow switching device 12, which is, for example, a four-way valve, switches the direction of refrigerant flow in the refrigerant circuit RC. The outdoor heat exchanger 13 exchanges heat between, for example, outdoor air and the refrigerant. The outdoor heat exchanger 13 functions as a condenser during cooling operation and as an evaporator during heating operation. The outdoor blower 16 sends outdoor air to the outdoor heat exchanger 13.

[0038] The expansion unit 14 is a pressure reducing valve or expansion valve that reduces the pressure of the refrigerant to expand it. The expansion unit 14 is, for example, an electronic expansion valve whose opening is adjustable. The indoor heat exchanger 15 is, for example, a device that exchanges heat between indoor air and the refrigerant. The indoor heat exchanger 15 acts as an evaporator during cooling operation and as a condenser during heating operation. The blower 17 is a device that sends indoor air to the indoor heat exchanger 15.

[0039] (Operation Modes, Cooling Operation) Next, the operation modes of the air conditioner 100 will be described. First, cooling operation will be described. In cooling operation, the refrigerant drawn into the compressor 11 is compressed by the compressor 11 and discharged in a high-temperature, high-pressure gas state. The high-temperature, high-pressure gas refrigerant discharged from the compressor 11 passes through the flow switching device 12 and flows into the outdoor heat exchanger 13, which functions as a condenser. In the outdoor heat exchanger 13, the refrigerant exchanges heat with outdoor air sent by the outdoor blower 16, condensing and liquefying. The condensed liquid refrigerant flows into the expansion section 14, where it expands and is decompressed to become a low-temperature, low-pressure, two-phase gas-liquid refrigerant. The two-phase gas-liquid refrigerant then flows into the indoor heat exchanger 15, which functions as an evaporator. In the indoor heat exchanger 15, the refrigerant exchanges heat with indoor air sent by the blower 17, evaporating and gasifying. At this time, the indoor air is cooled, and cooling is performed in the room. The evaporated refrigerant in a low-temperature, low-pressure gas state passes through the flow switching device 12 and is sucked into the compressor 11 .

[0040] (Operation Mode, Heating Operation) Next, the heating operation will be described. In the heating operation, the refrigerant drawn into the compressor 11 is compressed by the compressor 11 and discharged in a high-temperature, high-pressure gas state. The high-temperature, high-pressure gas refrigerant discharged from the compressor 11 passes through the flow switching device 12 and flows into the indoor heat exchanger 15, which functions as a condenser. In the indoor heat exchanger 15, the refrigerant exchanges heat with indoor air sent by the blower 17, condensing and liquefying. At this time, the indoor air is heated, and heating is performed in the room. The condensed liquid refrigerant flows into the expansion section 14, where it expands and decompresses to become a low-temperature, low-pressure, two-phase gas-liquid refrigerant. The two-phase gas-liquid refrigerant then flows into the outdoor heat exchanger 13, which functions as an evaporator. In the outdoor heat exchanger 13, the refrigerant exchanges heat with outdoor air sent by the outdoor blower 16, evaporating and gasifying. The evaporated refrigerant in a low-temperature, low-pressure gas state passes through the flow switching device 12 and is sucked into the compressor 11 .

[0041] The mounting position of the heat exchanger holding component 40 in the indoor heat exchanger 15 and the detailed structure of the heat exchanger holding component 40 will be described below. FIG. 6 is a plan view of the indoor heat exchanger unit 3 in FIG. 4. FIG. 7 is a cross-sectional view of the indoor heat exchanger unit 3 in FIG. 6 taken along line A-A, as viewed from the right side. FIG. 8 is a side view of the indoor heat exchanger unit 3 in FIG. 4 taken along line A-A, as viewed from the left side. FIG. 9 is an enlarged view of the portion Q of the indoor heat exchanger unit 3 in FIG. 8. FIG. 10 is a partial perspective view showing the configuration of the portion Q of the indoor heat exchanger unit 3 in FIG. 8. FIG. 11 is a cross-sectional view of the indoor heat exchanger unit 3 in FIG. 9 taken along line B-B, as viewed from the front side. FIG. 12 is a cross-sectional view of the indoor heat exchanger unit 3 in FIG. 9 taken along line C-C, as viewed from the rear side. In FIGS. 8 and 10, the folded portion 32b in the row farthest from the blower 17 out of the three rows of folded portions 32b is omitted to make the structure of the heat exchanger holding component 40 easier to understand.

[0042] To explain the mounting position of the heat exchanger holding component 40 in the indoor heat exchanger 15, the configuration of the heat transfer tube 32 of the indoor heat exchanger 15 will first be described with reference to Figures 6 to 8. As shown in Figure 6, the heat transfer tube 32 has a straight tube section 32a (see Figure 7) that extends linearly in the horizontal direction (arrow X direction) and penetrates the multiple fins 31, and a U-shaped folded-back section 32b (see Figures 6 and 8) that connects to the end of the straight tube section 32a in the horizontal direction (arrow X direction). The heat transfer tube 32 has a serpentine shape, with the straight tube sections 32a and folded-back sections 32b connected alternately.

[0043] In the indoor heat exchanger 15, heat exchange between the refrigerant and the indoor air mainly occurs via the plurality of fins 31 and the straight pipe sections 32a on which the plurality of fins 31 are provided. Because a portion of the straight pipe sections 32a is exposed from the gaps between the fins 31, indoor air passing through the gaps between the fins 31 hits this exposed portion of the straight pipe sections 32a, and heat exchange occurs between the refrigerant flowing inside the straight pipe sections 32a and the indoor air passing outside the straight pipe sections 32a. The fins 31 are in thermal contact with the straight pipe sections 32a of the heat transfer tubes 32, and therefore promote heat exchange by thermal conduction.

[0044] Next, the detailed structure of the heat exchanger holding component 40 and the mounting position of the heat exchanger holding component 40 will be described with reference to FIGS. 6 to 12 . As shown in FIGS. 7 and 8 , the heat exchanger holding component 40 has a plate-shaped holder substrate 41. As shown in FIG. 8 , the holder substrate 41 has a plurality of insertion holes 41h into which the folded-back portions 32b of the heat transfer tubes 32 are inserted. The holder substrate 41 is formed in a generally C-shape with a notch cut out from the lower rear side, and an arc-shaped recess 41r is formed at the lower rear edge in which the fan shaft 17a of the blower 17 is disposed. The lower rear edge of the holder substrate 41 faces the front edge of the left plate-shaped member 23b of the fan support portion 23 of the rear case 2 in the front-rear direction (direction of arrow Y), and together with the front edge of the left plate-shaped member 23b, rotatably supports the fan shaft 17a of the blower 17.

[0045] 6 to 8 , with the folded portions 32 b of the heat transfer tubes 32 of the plurality of heat exchange units 30 held by the heat exchanger holding component 40, the plate-shaped holder substrate 41 is positioned so as to be substantially perpendicular to the straight pipe portions 32 a extending in the horizontal direction (the direction of the arrow X). The holder substrate 41 has the function of concentrating the air flowing into the indoor heat exchanger 15 toward the center of the indoor heat exchanger 15 where the fins 31 are located, rather than toward the side of the indoor heat exchanger 15 where the folded portions 32 b are located. In other words, the holder substrate 41 is an air passage wall provided at one end of the air passage P of the air flowing into the indoor heat exchanger 15 in the horizontal direction (the direction of the arrow X) and defining one side (the left side) of the air passage P. Hereinafter, the surface of the holder substrate 41 that faces the fins 31 of each heat exchanger 30, i.e., the surface inside the air passage P, may be referred to as the first surface 41s1, and the surface opposite the first surface 41s1, i.e., the surface outside the air passage P, may be referred to as the second surface 41s2. In Fig. 6, the right surface of the holder substrate 41 is the first surface 41s1 that faces the fins 31, and the left surface of the holder substrate 41 is the second surface 41s2 that faces the left side surface 72 of the design case 7.

[0046] 7 and 8, the insertion holes 41h are provided in the holder substrate 41 at positions facing the two through holes 31h of the fin 31, in which the two straight pipe portions 32a connected to the folded portions 32b to be inserted into the insertion holes 41h are arranged. More specifically, the insertion holes 41h are elongated bundle-shaped holes that are long in the arrangement direction of the two opposing circular through holes 31h. The insertion holes 41h of the present disclosure include a drainage hole for condensation water (a drainage portion 41hd described below) at the bottom of the insertion holes 41h.

[0047] In the indoor heat exchanger unit 3 shown in Figures 7 and 8, three rows of through holes 31h are provided in the longitudinal direction of the fins 31 of each heat exchange section 30 between a first edge portion 31e1 and a second edge portion 31e2 extending in the longitudinal direction of the fins 31. Three rows of straight pipe portions 32a are also provided in the longitudinal direction of the fins 31, and two adjacent straight pipe portions 32a in the same row are connected by a folded portion 32b, giving the heat transfer pipes 32 a serpentine shape. Three rows of folded portions 32b are also provided corresponding to the rows of through holes 31h provided in the fins 31. Therefore, three rows of insertion holes 41h into which the folded portions 32b are inserted are provided in the holder substrate 41.

[0048] Here, the first edge 31e1 of the fin 31 refers to the edge closer to the blower 17 (see FIG. 2 ) of the two edges extending in the longitudinal direction of the fin 31 in the heat exchange unit 30, and the second edge 31e2 of the fin 31 refers to the edge farther from the blower 17. Note that the number of rows of the folded portions 32b, the number of rows of the through holes 31h, and the number of rows of the insertion holes 41h in each heat exchange unit 30 is not limited to three, and may be, for example, one row, two rows, or four or more rows.

[0049] 7, a guide wall 42 protruding toward the fin 31 (right side) is provided on the first surface 41s1 of the holder substrate 41 so as to follow the first edge 31e1 on the inside of the fin 31. The guide wall 42 guides condensation water flowing from the insertion hole 41h of the holder substrate 41 toward the first surface 41s1 along the upper surface of the guide wall 42 to the front drain pan 61 (see FIG. 2) or the rear drain pan 22u on the rear side. Providing the guide wall 42 can prevent the condensation water from falling and scattering within the housing 1.

[0050] As shown in FIG. 8 , the heat exchanger holding component 40 has a hook 43 that holds the upper portion of the folded portion 32 b. As shown in FIGS. 9 and 10 , the hook 43 protrudes from the second surface 41 s 2 of the holder substrate 41 and has a curved shape, such as a U-shape or a generally arc-like shape, that fits along the upper edge of the insertion hole 41 h. Here, the upper edge of the insertion hole 41 h refers to the portion including the uppermost upper end 41 hu of the periphery of the insertion hole 41 h on the second surface 41 s 2. As shown in FIG. 11 , the hook 43 holds the upper portion of the folded portion 32 b that is inserted into the insertion hole 41 h of the holder substrate 41 and protrudes from the second surface 41 s 2.

[0051] An example configuration of the hook 43 will be described. As shown in Fig. 10 , the hook 43 is formed into a downward U-shape by a pair of opposing curved hook pieces extending from an upper longitudinal end 41he of the insertion hole 41h on the second surface 41s2 along a portion of the periphery of the insertion hole 41h to both sides along the periphery. In Fig. 10 , the hook 43 is formed into a downward U-shape by a pair of curved hook pieces extending from the upper longitudinal end 41he of the insertion hole 41h to the front and rear. The hook pieces are connected to each other at the upper longitudinal end 41he of the insertion hole 41h, and each hook piece extends downward. Here, the insertion hole 41h shown in Figure 10 is arranged so that the longitudinal direction of the insertion hole 41h is the up-down direction (arrow Z direction), so the end 41he located on the upper side of the longitudinal ends of the insertion hole 41h coincides with the upper end 41hu of the insertion hole 41h.

[0052] The hook 43 is composed of a fixed piece 43b connected to the second surface 41s2 of the holder substrate 41 and a free piece 43a spaced apart from the holder substrate 41 and pressing the folded portion 32b toward the fixed piece 43b. That is, as shown in FIGS. 9 to 11 , the holder substrate 41 and the free piece 43a of the hook 43 are separated, and a gap 41g is formed between the holder substrate 41 and the free piece 43a of the hook 43. In FIGS. 9 and 10 , the rear hook piece of the pair of hook pieces is the fixed piece 43b, and the front hook piece is the free piece 43a. The tip 43ae of the free piece 43a is inclined toward the fixed piece 43b (rear side) so as to protrude inward beyond the periphery of the insertion hole 41h.

[0053] When the folded portion 32b is inserted into the insertion hole 41h of the holder substrate 41, the front side surface of the upper part of the folded portion 32b comes into contact with the inner surface (rear surface) of the tip end 43ae of the free piece 43a, and the tip end 43ae of the free piece 43a is pushed outward (frontward), thereby elastically deforming the free piece 43a of the hook 43. Therefore, the upper part of the folded portion 32b is pushed toward the fixed piece 43b (rearward) by the restoring force of the free piece 43a, and the upper part of the folded portion 32b is sandwiched and held between the fixed piece 43b and the free piece 43a.

[0054] The free piece 43a and the fixed piece 43b do not need to have the same length in the vertical direction (arrow Z direction), and may have different lengths as long as they can sandwich the folded portion 32b. In Figure 9, the fixed piece 43b is shorter than the free piece 43a. In this case, the contact area between the hook 43 and the folded portion 32b can be reduced by the amount of the shortened fixed piece 43b, thereby preventing a decrease in drainage performance due to condensation water remaining between the hook 43 and the folded portion 32b.

[0055] 12, a claw portion 43c is formed on the inner surface (rear surface) of the tip portion 43ae of the free piece 43a, protruding toward the fixed piece 43b (rear side). When the hook 43 holds the folded portion 32b, the claw portion 43c is positioned in the space 32g formed between the two ends of the U-shaped folded portion 32b. The claw portion 43c catches on the folded portion 32b, thereby preventing the folded portion 32b from falling out of the insertion hole 41h.

[0056] The configuration of the hook 43 is not limited to the above. For example, as shown in FIG. 10 , the hook 143 may have a curved shape extending in one direction from the upper longitudinal end 41he of the insertion hole 41h to follow a portion of the periphery, as in the case of the hook 143 provided on the right side of the U-shaped hook 43. This curved hook 143 is connected to the second surface 41s2 of the holder substrate 41 at the upper longitudinal end 41he of the insertion hole 41h. The tip of the hook 143 is spaced from the holder substrate 41 and inclined to protrude inward (rearward) from the periphery of the insertion hole 41h. The tip of the hook 143 presses the upper portion of the folded portion 32b against a portion of the inner circumferential surface of the insertion hole 41h that faces the tip of the hook 143 (the rear portion of the inner circumferential surface), thereby holding the upper portion of the folded portion 32b.

[0057] 10, a protrusion 45 is provided on the outer side (front side) of the tip 43ae of the free piece 43a of the hook 43 on the second surface 41s2 of the holder substrate 41. The protrusion 45 functions as a stopper for the free piece 43a of the hook 43, preventing the free piece 43a from opening outward excessively and breaking.

[0058] As shown in FIGS. 8 to 10 , the heat exchanger holding component 40 includes a partition wall 47 extending in the front-to-rear direction (arrow Y direction) on the second surface 41s2 of the holder substrate 41, separating two insertion holes 41h arranged vertically. Specifically, the partition wall 47 is provided between the lower end of the upper insertion hole 41h and a hook 43 provided on the upper edge of the lower insertion hole 41h. The partition wall 47 includes an inclined wall portion 47a inclined in the front-to-rear direction (arrow Y direction) and functions to promote drainage of condensation water. The inclined wall portion 47a extends downwardly and inclined toward the lower portion of the drainage portion 41hd (see FIGS. 9 and 10 ). As shown in FIG. 8 , multiple partition walls 47 are provided radially on the second surface 41s2 of the holder substrate 41.

[0059] 9, 10, and 12, the partition wall 47 has a blocking wall portion 47b that protrudes from the upper surface of the inclined wall portion 47a outside the lower portion of the insertion hole 41h (front side in FIG. 9). The blocking wall portion 47b is provided downstream of the drainage portion 41hd in the flow direction of condensation water flowing along the upper surface of the inclined wall portion 47a (front side in FIG. 9), and blocks the condensation water flowing along the upper surface of the inclined wall portion 47a. Also, as shown in FIGS. 9 to 12, the partition wall 47 has a side wall portion 47c that is provided on the edge of the upper surface of the inclined wall portion 47a farther from the second surface 41s2 so as to cover the lower portion of the insertion hole 41h, i.e., the drainage portion 41hd. One end of the side wall 47c is connected to the blocking wall 47b, and the side wall 47c prevents condensation water that flows along the upper surface of the inclined wall 47a and is blocked by the blocking wall 47b from splashing sideways. In this way, the blocking wall 47b and the side wall 47c are provided, which promotes the flow of condensation water from the second surface 41s2 of the holder substrate 41 to the first surface 41s1 through the lower part of the insertion hole 41h (the drainage part 41hd described later).

[0060] The partition wall 47 may have a sawtooth shape in which inclined wall portions 47a and blocking wall portions 47b are alternately connected, as in the partition wall 47 shown in the upper part of Fig. 9. Alternatively, the partition wall 47 may be formed of a single inclined wall portion 47a that is inclined from an inner edge portion 41i on the holder substrate 41 that is close to the blower 17 (see Fig. 2) toward the outside (the front side in Fig. 9), as in the partition wall 47 shown in the lower part of Fig. 9. In this case, the hook 43 of the insertion hole 41h provided below the inclined wall portion 47a may be connected to the inclined wall portion 47a, and the hook 43 may serve as a blocking wall portion 47b for the insertion hole 41h provided above the inclined wall portion 47a.

[0061] 9 and 10, a drainage portion 41hd is provided below the insertion hole 41h. Specifically, the insertion hole 41h has a piping region 41hp (see FIG. 10) having a rounded rectangular shape in which the folded portion 32b held by the hook 43 is disposed, and the drainage portion 41hd provided below the piping region 41hp. For example, by providing a gap of 3 mm or more between the upper surface of the inclined wall portion 47a of the partition wall 47 and the lower end of the folded portion 32b, condensed water can easily flow into the drainage portion 41hd.

[0062] The upper part of the folded portion 32b inserted into the insertion hole 41h is held by a hook 43, and a drainage section 41hd is provided below the piping area 41hp in the insertion hole 41h. This configuration makes it difficult for dew to accumulate below the insertion hole 41h, thereby improving the drainage of condensation water that forms in the folded portion 32b compared to conventional methods.

[0063] 9 and 10 , the drainage portion 41hd is provided below the piping region 41hp and extends forward, and the insertion hole 41h is generally L-shaped. Also, in the example of Fig. 9 and 10 , the lower end surface 41hb of the insertion hole 41h that forms the drainage portion 41hd is inclined in the front-to-rear direction (the direction of the arrow Y) along the inclined wall portion 47a of the partition wall 47 provided below the insertion hole 41h.

[0064] The drainage portion 41hd and the partition wall 47 are connected flush with each other in the horizontal direction (the direction of the arrow X), allowing condensation water to flow smoothly from the second surface 41s2 side to the first surface 41s1 side of the holder substrate 41. More specifically, the lower end surface 41hb of the insertion hole 41h and the upper surface of the inclined wall portion 47a of the partition wall 47 are connected flush with each other in the horizontal direction (the direction of the arrow X), and the front end surface of the drainage portion 41hd extending forward and the blocking wall portion 47b of the partition wall 47 are connected flush with each other in the horizontal direction (the direction of the arrow X).

[0065] 10 , the second surface 41s2 of the holder substrate 41 has an extension wall 44 that extends upward from an end 41he that is an end in the longitudinal direction of the insertion hole 41h and is located on the upper side in the vertical direction (arrow Z direction), and connects the hook 43 to the upper partition wall 47. In the configurations in which a portion of the hook 43, 143 is separated from the holder substrate 41 as in the two configuration examples above, providing the extension wall 44 increases the number of connection portions between the hook 43 and the holder substrate 41, and the hook 43 can be reinforced.

[0066] The process of condensation on the heat transfer tube 32 and the flow of condensed water in the heat exchanger support component will be described below with reference to Figures 6 and 10. When the air conditioner 100 (see Figure 5) performs cooling operation and the indoor heat exchanger 15 functions as an evaporator, the heat transfer tube 32 is cooled by the refrigerant flowing inside the heat transfer tube 32. At this time, if the humidity around the heat transfer tube 32 is high, condensation may occur on the surface of the heat transfer tube 32. Condensation also occurs at the folded portion 32b of the heat transfer tube 32, and the amount of condensed water gradually increases as the cooling operation continues.

[0067] When the amount of condensed water 50 generated at the folded portion 32b of the heat transfer tube 32 increases, the condensed water adheres to the second surface 41s2 side of the holder substrate 41, straddling the folded portion 32b of the heat transfer tube 32 and the hook 43 of the heat exchanger holding component 40 shown in Fig. 10. In the present disclosure, the folded portion 32b is held by the hook 43 provided on the upper edge of the insertion hole 41h, so that the condensed water moves downward by gravity along the hook piece of the hook 43 and falls from the lower end of the hook piece to the bottom of the insertion hole 41h. The condensed water that falls to the bottom of the insertion hole 41h flows from the second surface 41s2 side to the first surface 41s1 side via the drainage portion 41hd below the folded portion 32b. At this time, condensation water from the lower ends of the hook pieces falls onto the partition wall 47 provided below the insertion hole 41h, but because the partition wall 47 has the inclined wall portion 47a, the condensation water does not accumulate in front of the inclined wall portion 47a and is guided to the drain portion 41hd. The condensation water that flows toward the first surface 41s1 via the drain portion 41hd moves downward along the guide wall 42 and is drained into the drain pan 61 or the rear drain pan 22u located below the heat exchanger holding component 40. Unlike a conventional configuration in which a wall portion is provided around the entire periphery of the folded portion 32b, in the present disclosure, the folded portion 32b is held by the hooks 43 on the upper edge of the insertion hole 41h, and the drain portion 41hd is provided below the folded portion 32b in the insertion hole 41h. Therefore, in the heat exchanger holding component 40 of the present disclosure, dew pools are not formed between the folded portion 32b and the hook 43, and corrosion of the heat transfer tube 32 caused by continued contact between the condensed water and the folded portion 32b can be suppressed.

[0068] As described above, the indoor heat exchanger unit 3 according to the first embodiment includes a plurality of fins 31 arranged at intervals in one direction (the direction of the arrow X), and a heat transfer tube 32 that penetrates the plurality of fins 31 and has a folded portion 32b that folds back at an end in one direction. The indoor heat exchanger unit 3 also includes a heat exchanger holding component 40 that is provided at an end in one direction (e.g., the left end) of the heat transfer tube 32 and has a plate-shaped holder substrate 41 that has an insertion hole 41h into which the folded portion 32b is inserted. The heat exchanger holding component 40 has a hook 43 that protrudes from a second surface 41s2 of the holder substrate 41 that is opposite a first surface 41s1 that faces the fins 31 and is provided at an upper edge of the insertion hole 41h to hold an upper portion of the folded portion 32b. The insertion hole 41h includes a piping area 41hp having a rectangular shape with rounded corners in which the folded portion 32b held by the hook 43 is arranged, and a drainage hole (drainage portion 41hd) provided below the piping area 41hp and connected to the piping area 41hp.

[0069] In the present disclosure, the hooks 43 that hold the folded portion 32b of the heat transfer tube 32 are provided on the upper edge of the insertion hole 41h, and a drainage hole (drainage portion 41hd) is provided in the insertion hole 41h below the piping region 41hp. As a result, condensation water generated at the folded portion 32b flows downward from the hooks 43 by gravity and is drained out of the heat exchanger holding component 40 via the drainage portion 41hd, making it difficult for condensation to accumulate in contact with the folded portion 32b. This prevents corrosion of the heat transfer tube 32 due to condensation water remaining in the heat exchanger holding component 40, thereby extending the life of the indoor heat exchanger unit 3.

[0070] The indoor heat exchanger unit 3 also includes an inclined wall 47a that protrudes from the second surface 41s2 of the holder substrate 41 and extends downwardly toward the bottom of the drain hole (drain portion 41hd). The inclined wall 47a guides condensation water that has fallen from the hooks 43 to the drain portion 41hd without causing dew accumulation, thereby facilitating drainage.

[0071] The indoor heat exchanger unit 3 also includes a blocking wall 47b that protrudes from the upper surface of the inclined wall 47a and is located downstream of the drain hole (drain 41hd) in the direction of condensation water flowing along the upper surface of the inclined wall 47a to block the condensation water. This allows the condensation water to easily enter the drain 41hd, facilitating drainage.

[0072] The indoor heat exchanger unit 3 also includes a side wall 47c connected to the blocking wall 47b, which is provided on the edge of the upper surface of the inclined wall 47a farther from the second surface 41s2 so as to cover the drainage section 41hd. This allows the condensation water blocked by the blocking wall 47b to be guided to the drainage section 41hd while preventing it from splashing, further accelerating drainage.

[0073] The hook 43 is formed in a downward U-shape with a fixed piece 43b and a free piece 43a facing each other and extending from the upper longitudinal end 41he of the insertion hole 41h on the second surface 41s2 of the holder substrate 41 along a portion of the periphery of the insertion hole 41h. The fixed piece 43b is connected to the second surface 41s2 of the holder substrate 41, while the free piece 43a is spaced apart from the holder substrate 41. The hook 43 holds the upper part of the folded portion 32b inserted into the insertion hole 41h by sandwiching it between the free piece 43a and the fixed piece 43b. This allows for a hook 43 with a simple structure that holds the upper part of the folded portion 32b and is less likely to accumulate condensation.

[0074] The hook 143 has a curved shape extending in one direction along a portion of the periphery of the insertion hole 41h from the upper end 41he in the longitudinal direction of the insertion hole 41h on the second surface 41s2 of the holder substrate 41. The tip of the hook 143 is provided away from the holder substrate 41 and holds the upper part of the folded portion 32b inserted into the insertion hole 41h by pressing it against a part of the inner surface of the insertion hole 41h that faces the tip of the hook 143. This makes it possible to realize a hook 143 with a simple structure that holds the upper part of the folded portion 32b and is less likely to accumulate dew.

[0075] The indoor heat exchanger unit 3 also includes an extension wall 44 that protrudes from the second surface 41s2 of the holder substrate 41 and extends upward from the hooks 43, 143. This increases the number of connection portions between the hooks 43, 143 and the holder substrate 41, thereby reinforcing the hooks 43, 143.

[0076] The indoor unit 10A of the air conditioner according to Embodiment 1 includes the above-described indoor heat exchanger unit 3 and a blower 17 that supplies indoor air to the indoor heat exchanger 15, which is composed of a plurality of fins 31 and heat transfer tubes 32 of the indoor heat exchanger unit 3. The indoor heat exchanger 15 is composed of a plurality of heat exchange sections 30 (e.g., a front heat exchange section 30f and a rear heat exchange section 30b) that are arranged along the outer peripheral surface of the blower 17. The heat exchanger holding component 40 supports the heat transfer tubes 32 at one end of the plurality of heat exchange sections 30. This improves the reliability of the indoor unit 10A of the air conditioner.

[0077] REFERENCE SIGNS LIST 1 Housing, 2 Rear case, 3 Indoor heat exchanger unit, 5 Electrical equipment box, 6 Air outlet structure, 7 Design case, 7a Intake port, 7b Air outlet, 8 Front panel, 9 Automatic cleaning mechanism, 10A Indoor unit, 10B Outdoor unit, 11 Compressor, 12 Flow path switching device, 13 Outdoor heat exchanger, 14 Expansion section, 15 Indoor heat exchanger, 16 Outdoor blower, 17 Blower, 17a Fan shaft, 18 Refrigerant piping, 18a Refrigerant piping, 21 Rear section, 22 Air path component, 22u Rear drain pan, 23 Fan support section, 23a Plate-shaped member, 23b Plate-shaped member, 23br Recess, 30 Heat exchange section, 30b Rear heat exchange section, 30f Front heat exchange section, 30f1 Front section, 30f2 Inclined wall section, 31 Fin, 31e1 first edge portion, 31e2 second edge portion, 31h through hole, 32 heat transfer tube, 32a straight tube portion, 32b folded portion, 32g space, 40 heat exchanger holding part, 41 holder substrate, 41g gap, 41h insertion hole, 41hb lower end surface, 41hd drainage portion, 41he end portion, 41hp piping area, 41hu upper end, 41i inner edge portion, 41r recessed portion, 41s1 first surface, 41s2 second surface, 42 guide wall, 43 hook, 43a free piece, 43ae tip portion, 43b fixing piece, 43c claw portion, 44 extension wall, 45 protrusion portion, 47 partition wall, 47a inclined wall portion, 47b damming wall portion, 47c side wall portion, 50 Condensation water, 61 drain pan, 61b underside, 63 air deflector, 63a left and right air deflectors, 63b up and down air deflectors, 71 front frame portion, 71a front upper frame portion, 71b inclined lower frame portion, 71o front opening, 72 left side surface portion, 73 right side surface portion, 74 left upper surface portion, 75 right upper surface portion, 90 filter, 91 filter support portion, 92 dust box, 100 air conditioner, 143 hook, P air duct, RC refrigerant circuit.

Claims

1. A plurality of fins arranged at intervals in one direction; a heat transfer tube that passes through the fins and has a folded-back portion that is folded back at an end portion in the one direction; a heat exchanger holding component provided at the end of the heat transfer tube in the one direction and having a plate-shaped holder substrate having an insertion hole into which the folded portion is inserted, The heat exchanger holding part is a hook protruding from a second surface of the holder substrate opposite to a first surface facing the fin and provided at an upper edge of the insertion hole, the hook holding an upper portion of the folded portion; the insertion hole includes a piping area having a rectangular shape with rounded corners in which the folded portion held by the hook is disposed, and a drainage hole provided below the piping area and communicating with the piping area, The heat exchanger holding part is The holder base plate includes an inclined wall portion that is protruded from the second surface and extends downward toward a lower portion of the drainage hole. Indoor heat exchanger unit.

2. a damming wall portion that protrudes from the upper surface of the inclined wall portion and is provided downstream of the drainage hole in the flow direction of condensation water flowing on the upper surface to dam up the condensation water; 2. The indoor heat exchanger unit according to claim 1.

3. A side wall portion is provided on the edge portion of the upper surface of the inclined wall portion farther from the second surface so as to cover the drain hole and is connected to the blocking wall portion.

3. The indoor heat exchanger unit according to claim 2.

4. the hook is formed in a downward U-shape and has a fixed piece and a free piece that face each other and extend along a part of a peripheral portion of the insertion hole from an upper end of the insertion hole in a longitudinal direction of the insertion hole on the second surface of the holder substrate, the fixing piece is provided so as to be connected to the second surface of the holder substrate, The free piece is provided at a distance from the holder substrate, The hook holds the upper part of the folded portion inserted into the insertion hole by pinching it between the free piece and the fixed piece. An indoor heat exchanger unit according to any one of claims 1 to 3.

5. the hook has a curved shape extending in one direction from an upper end of a periphery of the insertion hole in a longitudinal direction of the insertion hole in the second surface of the holder substrate so as to follow a part of the periphery, The tip of the hook is provided at a distance from the holder substrate, and is held by pressing an upper portion of the folded portion inserted into the insertion hole against a portion of the inner circumferential surface of the insertion hole that faces the tip of the hook. An indoor heat exchanger unit according to any one of claims 1 to 3.

6. an extension wall that is provided to protrude from the second surface of the holder base plate and extends upward from the hook; An indoor heat exchanger unit according to any one of claims 1 to 3.

7. An indoor heat exchanger unit according to any one of claims 1 to 3; a blower for supplying indoor air to an indoor heat exchanger constituted by the plurality of fins and the heat transfer tube of the indoor heat exchanger unit, The indoor heat exchanger is composed of a plurality of heat exchange units arranged along an outer circumferential surface of the blower, The heat exchanger holding component supports the heat transfer tubes at the ends of the heat exchange sections in one direction. Air conditioner indoor unit.