Air conditioner

Abstract

Provided is an air conditioner comprising an indoor unit, an outdoor unit, a refrigerant pipe joining the indoor unit and the outdoor unit, and a ventilation device, the ventilation device having a ventilation pipe, a ventilation fan, and a base body provided with an air duct that joins the ventilation pipe and the ventilation fan, the air duct having an inflow port connected to the ventilation pipe, an outflow port connected to the ventilation fan and positioned on one side of the inflow port in a first direction orthogonal to the vertical direction, a first region that extends downward from the inflow port, a second region that extends downward from the outflow port, and a turnback region that joins lower ends of the first region and the second region, the base body having, in an inside surface surrounding the air duct, a bottom surface that is positioned below the turnback region, the bottom surface having a first bottom surface part facing upward, a second bottom surface part that faces upward and is positioned above and on one side of the first bottom surface part in the first direction, and a level-difference surface part that joins the first bottom surface part and the second bottom surface part, a drain hole that penetrates through the base body being formed in the first bottom surface part, and the level-difference surface part being inclined toward a higher position progressively toward one side in the first direction.

Description

air conditioner

[0001] The present disclosure relates to an air conditioner.

[0002] In recent years, air conditioners that maintain a comfortable indoor temperature by exchanging heat with indoor air using a heat exchanger inside the indoor unit and then supplying the air indoors have become common. However, since such air conditioners only circulate indoor air using the indoor unit and do not ventilate the air between the indoor unit and the outside, the indoor air becomes polluted if the room is left sealed for a long period of time. Therefore, air conditioners equipped with a ventilation unit that exhausts indoor air to the outside have been disclosed (see, for example, Patent Document 1).

[0003] Patent No. 3570260

[0004] To ensure quietness inside the room, it is preferable to place the ventilation fan of the ventilation system outdoors. In this case, for example, when the heater is turned on in winter, the air in the ventilation pipe connecting the room and the ventilation fan is cooled by the outside air, causing condensation inside the ventilation pipe. For this reason, it is desirable to provide the ventilation system with drainage holes that drain condensation water from the air duct to the ground outside. However, there is a concern that the drainage ability of such drainage holes will deteriorate due to the accumulation of dirt over long-term use.

[0005] In view of the above circumstances, the present disclosure has an object to provide an air conditioner equipped with a ventilation device with improved drainage performance.

[0006] One aspect of an air conditioner according to the present disclosure includes an indoor unit installed indoors and having a first heat exchanger, an outdoor unit installed outdoors and having a second heat exchanger, refrigerant piping that passes through a through-hole in a wall separating the indoor space from the outdoor space and connects the first heat exchanger and the second heat exchanger, and a ventilation device that ventilates air inside the room, the ventilation device having a ventilation piping that passes from the indoor space to the outdoor space through the through-hole, a ventilation fan, and a base body in which an air passage that connects the ventilation piping and the ventilation fan is provided, the air passage having an inlet connected to the ventilation piping, and a fan that is located on one side of the inlet in a first direction perpendicular to a vertical direction and connected to the ventilation fan the airflow passage is formed on the inner surface of the air passage, the airflow passage being ...

[0007] According to the present disclosure, it is possible to provide an air conditioner equipped with a ventilation device with improved drainage performance.

[0008] Fig. 1 is a schematic diagram showing a general configuration of an air conditioner according to an embodiment. Fig. 2 is a schematic diagram showing the installation state of the air conditioner according to the embodiment as seen from the side. Fig. 3 is a schematic diagram showing the installation state of the air conditioner according to the embodiment as seen from an oblique direction. Fig. 4 is an exploded view of a ventilation device main body according to an embodiment. Fig. 5 is an exploded view of a base main body according to an embodiment. Fig. 6 is a front view of a first member according to an embodiment as seen from the front. Fig. 7 is a partial cross-sectional view of the base main body according to an embodiment. Fig. 8 is a front view of a first member according to an embodiment, showing the airflow in the folded-back region.

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the scope of the present disclosure is not limited to the following embodiments and can be modified as desired within the scope of the technical concept of the present disclosure. In addition, in the following drawings, the scale and number of each structure may differ from the scale and number of the actual structure in order to make each configuration easier to understand.

[0010] The drawings also show the X-axis, Y-axis, and Z-axis as appropriate. The X-axis indicates one of the horizontal directions. The Y-axis indicates the other of the horizontal directions. The Z-axis indicates the vertical direction. In the following description, the horizontal direction along the X-axis is referred to as the "front-rear direction X," the horizontal direction along the Y-axis is referred to as the "left-right direction Y," and the vertical direction is referred to as the "vertical direction Z." The front-rear direction X, left-right direction Y, and vertical direction Z are perpendicular to each other. In the following description, the side of the vertical direction Z toward which the Z-axis arrow points (+Z direction) is referred to as the upside, and the side of the vertical direction Z opposite to the side toward which the Z-axis arrow points (-Z direction) is referred to as the downside. Furthermore, the side of the front-rear direction X toward which the X-axis arrow points (+X direction) is referred to as the front, and the side of the front-rear direction X opposite to the side toward which the X-axis arrow points (-X direction) is referred to as the rear. In addition, the side of the left-right direction Y toward which the Y-axis arrow points (+Y direction) is defined as the right side, and the side opposite to the side toward which the Y-axis arrow points (-Y direction) is defined as the left side.

[0011] <Overall Configuration> Fig. 1 is a schematic diagram showing the overall configuration of an air conditioner 100 according to the present embodiment. As shown in Fig. 1, the air conditioner 100 includes an outdoor unit 10, an indoor unit 20, a circulation path section (refrigerant piping) 18, and a ventilation device 30. The outdoor unit 10 is disposed outdoors 7. The indoor unit 20 is disposed indoors 8. The outdoor unit 10 and the indoor unit 20 are connected to each other by a circulation path section 18 through which a refrigerant 19 circulates. A portion of the ventilation device 30 is disposed indoors 8, and another portion is disposed outdoors 7. The ventilation device 30 exhausts air from the room 8 in which the indoor unit 20 is disposed to the outdoors 7.

[0012] The air conditioner 100 is capable of adjusting the temperature of the air in the room 8 by exchanging heat between the refrigerant 19 flowing in the circulation path portion 18 and the air in the room 8 in which the indoor unit 20 is located. Examples of the refrigerant 19 include fluorine-based refrigerants and hydrocarbon-based refrigerants, which have a low global warming potential (GWP).

[0013] The outdoor unit 10 includes an outdoor unit housing 11, a compressor 12, a heat exchanger 13, a flow rate adjustment valve 14, a blower 15, a four-way valve 16, and a control unit 17. The outdoor unit housing 11 houses the compressor 12, the heat exchanger 13, the flow rate adjustment valve 14, the blower 15, the four-way valve 16, and the control unit 17.

[0014] The compressor 12, the heat exchanger 13, the flow rate adjustment valve 14, and the four-way valve 16 are provided in a portion of the circulation path 18 that is located inside the outdoor unit housing 11. The compressor 12, the heat exchanger 13, the flow rate adjustment valve 14, and the four-way valve 16 are connected by a portion of the circulation path 18 that is located inside the outdoor unit housing 11.

[0015] The four-way valve 16 is provided in a portion of the circulation path section 18 that is connected to the discharge side of the compressor 12. The four-way valve 16 can reverse the direction of the refrigerant 19 flowing through the circulation path section 18 by switching a portion of the path of the circulation path section 18. When the path connected by the four-way valve 16 is the path shown by the solid line on the four-way valve 16 in Fig. 1, the refrigerant 19 flows through the circulation path section 18 in the direction shown by the solid arrow in Fig. 1. On the other hand, when the path connected by the four-way valve 16 is the path shown by the dashed line on the four-way valve 16 in Fig. 1, the refrigerant 19 flows through the circulation path section 18 in the direction shown by the dashed arrow in Fig. 1.

[0016] The indoor unit 20 includes an indoor unit housing 21, a heat exchanger 22, a blower 23 as a blower, and a control unit 24. The indoor unit housing 21 houses the heat exchanger 22, the blower 23, and the control unit 24. The indoor unit 20 is capable of cooling operation to cool the air in the room 8 in which the indoor unit 20 is located, and heating operation to warm the air in the room 8 in which the indoor unit 20 is located. Note that the blower 23 is illustrated in FIG. 1 .

[0017] When the indoor unit 20 is in cooling operation, the refrigerant 19 flowing in the circulation path portion 18 flows in the direction shown by the solid arrow in Fig. 1. In other words, when the indoor unit 20 is in cooling operation, the refrigerant 19 flowing in the circulation path portion 18 circulates through the compressor 12, the heat exchanger 13 of the outdoor unit 10, the flow control valve 14, and the heat exchanger 22 of the indoor unit 20 in that order, before returning to the compressor 12. During cooling operation, the heat exchanger 13 in the outdoor unit 10 functions as a condenser, and the heat exchanger 22 in the indoor unit 20 functions as an evaporator.

[0018] On the other hand, when the indoor unit 20 is in heating operation, the refrigerant 19 flowing in the circulation path portion 18 flows in the direction shown by the dashed line in Fig. 1. In other words, when the indoor unit 20 is in heating operation, the refrigerant 19 flowing in the circulation path portion 18 circulates through the compressor 12, the heat exchanger 22 of the indoor unit 20, the flow control valve 14, and the heat exchanger 13 of the outdoor unit 10 in that order, before returning to the compressor 12. In heating operation, the heat exchanger 13 in the outdoor unit 10 functions as an evaporator, and the heat exchanger 22 in the indoor unit 20 functions as a condenser.

[0019] 2 and 3 are schematic diagrams showing the installation state of the air conditioner 100 according to the embodiment. As shown in Fig. 2, the indoor unit 20 is a wall-mounted indoor unit that is fixed to an upper region of a wall surface 9a of the room 8. The indoor unit 20 has a generally rectangular parallelepiped shape that is long in the left-right direction Y.

[0020] As shown in Fig. 2, the blower 23 is housed in the indoor unit housing 21. The blower 23 extends in the left-right direction Y. The blower 23 rotates around its rotation axis by a fan motor 23a. The heat exchanger 22 is disposed inside the indoor unit housing 21, between the blower 23 and the indoor unit air inlet 20a. The heat exchanger 22 extends in the left-right direction Y.

[0021] The indoor unit housing 21 has an outer shell member 21b and an air passage member 21d. The outer shell member 21b is a member that constitutes part of the outer shell of the indoor unit housing 21. The outer shell member 21b improves the design of the exterior of the indoor unit 20. The outer shell member 21b is a substantially rectangular box-shaped member that opens on the wall surface 9a side. The opening of the outer shell member 21b on the wall surface 9a side is closed by the air passage member 21d. The air passage member 21d is a member that constitutes part of the air passage through which air drawn into the indoor unit housing 21 by the blower 23 passes. The air passage member 21d is hooked onto an installation plate (not shown) that is fixed to the wall surface 9a on the room 8 side. This fixes the indoor unit 20 to the wall surface 9a.

[0022] The indoor unit housing 21 has an indoor unit inlet 20a and an indoor unit outlet 20b. In this embodiment, the indoor unit inlet 20a and the indoor unit outlet 20b are formed in an outer shell member 21b. The indoor unit inlet 20a opens upward and extends in the axial direction. A filter (not shown) is disposed in the indoor unit inlet 20a. On the other hand, the indoor unit outlet 20b opens toward the room 8 and extends in the axial direction. A wind direction control vane 25 is disposed in the indoor unit outlet 20b.

[0023] Air from the room 8 is drawn into the indoor unit housing 21 through the indoor unit inlet 20a by driving the blower 23. The air drawn into the indoor unit housing 21 through the indoor unit inlet 20a passes through the heat exchanger 22 and is blown out into the room 8 from the indoor unit outlet 20b. The air passing through the indoor unit outlet 20b is blown by the air direction control vane 25 in the vertical direction Z and the left-right direction Y of the room 8.

[0024] A control unit 24 is provided inside the indoor unit housing 21. The control unit 24 is disposed inside the indoor unit housing 21 at one end in the left-right direction Y. The control unit 24 controls the fan motor 23 a, the airflow direction control vane 25, the heat exchanger 22, etc.

[0025] The external shape of the indoor unit housing 21 is a rectangular pillar extending in the left-right direction Y. The indoor unit housing 21 has an upper surface 21p facing upward and a lower surface 21q facing downward. The indoor unit air inlet 20a is provided on the upper surface 21p. The indoor unit air outlet 20b is provided on the lower surface 21q.

[0026] As shown in Fig. 3, a drain hose 20d is provided to the indoor unit 20. The tip of the drain hose 20d extends to the outside 7. The drain hose 20d discharges drain water that condenses on the heat exchanger 22 to the outside 7 during cooling.

[0027] <Outdoor unit> The outdoor unit 10 is placed outdoors 7. The outdoor unit housing 11 has an outdoor unit inlet 11b and an outdoor unit outlet 11a. Inside the outdoor unit housing 11, a blower 15 (see FIG. 1) sends air from the outdoor unit inlet 11b side through a heat exchanger 13 (see FIG. 1) toward the outdoor unit outlet 11a, thereby promoting heat exchange in the heat exchanger 13.

[0028] As shown in Fig. 3, the outdoor unit 10 and the indoor unit 20 are connected by a circulation path 18 and a first electrical wiring 10e. The circulation path 18 is configured in a loop shape between the outdoor unit 10 and the indoor unit 20. Therefore, the circulation path 18 connects the outdoor unit 10 and the indoor unit 20 with a pair of pipes. The first electrical wiring 10e includes a power supply line that supplies power to the outdoor unit 10 via the indoor unit 20, and a signal line for controlling the outdoor unit 10 and the indoor unit 20 in cooperation with each other. The circulation path 18 and the first electrical wiring 10e pass through a through-hole 9h provided in the wall 9 that separates the indoor space 8 from the outdoor space 7. As a result, the circulation path 18 and the first electrical wiring 10e are drawn from the indoor space 8 to the outdoor space 7.

[0029] <Ventilation Device> The ventilation device 30 is a device that ventilates the room 8 by discharging the air from the room 8 to the outside 7, and keeps the air in the room 8 clean. The ventilation device 30 may be driven in conjunction with the driving of the indoor unit 20 and the outdoor unit 10, or may be driven independently of these.

[0030] The ventilation device 30 has a ventilation intake section 32, ventilation piping 31, and a ventilation device main body 50. The ventilation intake section 32 is attached to the indoor unit 20 in the room 8. The ventilation device main body 50 is installed on a wall surface 9b of the outdoor room 7. The ventilation piping 31 extends across the indoor room 8 and the outdoor room 7.

[0031] The ventilation intake section 32 draws in air from the room 8. The ventilation intake section 32 is provided on the surface of the indoor unit housing 21. In the present embodiment, the ventilation intake section 32 is located on the lower surface 21q of the indoor unit housing 21.

[0032] The ventilation pipe 31 is a tubular pipe. The ventilation pipe 31 connects the ventilation device main body 50 and the ventilation intake section 32. Therefore, one end of the ventilation pipe 31 is located inside the room 8, and the other end is located outside the room 7. The ventilation pipe 31 passes through the inside of the indoor unit housing 21 and the through-hole 9h in the wall 9, and is drawn out to the outside the room 7.

[0033] FIG. 4 is an exploded view of the ventilation device main body 50. In the following description of the ventilation device main body 50, the direction perpendicular to the vertical direction Z along the wall surface 9b to which the ventilation device main body 50 is attached is referred to as the left-right direction Y, or the first direction, and the direction perpendicular to the wall surface 9b is referred to as the front-rear direction X, or the second direction. Furthermore, in the following description, the direction perpendicular to the wall surface 9b, away from the wall surface 9b, is referred to as the forward (+X direction) or one side of the second direction, and the direction approaching the wall surface 9b is referred to as the rear (-X direction) or the other side of the second direction. In the following description of the ventilation device main body 50, left and right are defined based on the posture of the observer facing forward (+X direction). That is, the left-hand side of an observer facing the opposite side (+X direction) of the wall surface 9b is referred to as the right-hand side (+Y direction) or one side of the first direction, and the right-hand side is referred to as the left-hand side (-Y direction) or the other side of the first direction. In this embodiment, the left-right direction of the ventilation device main body 50 and the left-right direction of the outdoor unit 10 coincide with each other, but these left-right directions do not necessarily have to coincide with each other.

[0034] The ventilation device main body 50 has a ventilation fan 51 , a duct member 52 , a backflow check valve 53 , a base 80 , a joint member 75 , and a case 40 .

[0035] The base 80 is fixed to the wall surface 9b with fixing screws (not shown). The base 80 supports other components of the ventilation device main body 50. The ventilation piping 31 (see FIG. 3) is connected to the base 80. The base 80 has the base main body 60, the mounting plate 70, and the drain valve 69.

[0036] The mounting plate 70 is a plate-shaped member made of sheet metal. The mounting plate 70 is disposed between the base body 60 and the wall surface 9b. The mounting plate 70 protects the wall surface 9b. The upper end of the case 40 is engaged with the upper end 70a of the mounting plate 70. The lower end 70c of the mounting plate 70 is bent forward. The lower end of the case 40 is screwed to the lower end 70c of the mounting plate 70.

[0037] The base body 60 is a box-shaped member, and has an air passage F formed therein. The air passage F is an air flow path connecting the ventilation pipe 31 (see FIG. 3 ) and the ventilation fan 51. The configurations of the base body 60 and the drain valve 69 attached to the base body 60 will be described in detail later.

[0038] The ventilation fan 51 is fixed to the base body 60 from the front (+X direction). The ventilation fan 51 has a cylindrical rotor 51a centered on a central axis extending in the front-rear direction X, a fan motor 51b that rotates the rotor 51a, a fan box 51c that houses the rotor 51a and the fan motor 51b, and a terminal block 51e. The ventilation fan 51 in this embodiment is a so-called sirocco fan. The ventilation fan 51 rotates the rotor 51a to send air from the inner diameter side to the outer diameter side of the rotor 51a.

[0039] The fan box 51c is fixed to a surface of the base body 60 facing forward (+X direction). A rotor 51a and a fan motor 51b are disposed inside the fan box 51c. The fan box 51c has a fan inlet (not shown) connected to the outlet 62a of the base body 60 and a fan outlet 51d facing downward. As the rotor 51a rotates, the ventilation fan 51 draws air from the air passage F of the base body 60 at the fan inlet and blows the air downward from the fan outlet 51d.

[0040] The terminal block 51e supports a plurality of terminals (not shown) extending from the fan motor 51b. Electrical wiring (not shown) extending from the indoor unit 20 or the outdoor unit 10 is connected to these terminals.

[0041] The backflow check valve 53 is attached to the fan outlet 51d. The backflow check valve 53 closes the fan outlet 51d. The backflow check valve 53 opens as the ventilation fan 51 blows air out of the fan outlet 51d. The backflow check valve 53 prevents air from flowing back from the fan outlet 51d toward the inside of the ventilation fan 51.

[0042] The duct member 52 is attached to the case 40. The duct member 52 is disposed directly below the fan outlet 51 d. The duct member 52 guides the air blown downward from the fan outlet 51 d to the exhaust port 46 a provided at the lower end of the case 40.

[0043] The case 40 is box-shaped and opens to the rear. The case 40 is supported by the mounting plate 70. The case 40 covers each part of the ventilation device main body 50 (the base 80, the ventilation fan 51, the backflow check valve 53, and the duct member 52). In this way, the case 40 protects each part of the ventilation device main body 50.

[0044] <Structure of Air Passage of Ventilation Device> Figure 5 is an exploded view of the base body 60. As shown in Figure 5, the base body 60 has a first member 61 and a second member 62 that are assembled together in the front-rear direction X. That is, in this embodiment, the front-rear direction X corresponds to the "assembly direction." An air passage F is provided inside the base body 60. The air passage F is mainly formed between the first member 61 and the second member 62.

[0045] The first member 61 constitutes the rear side (i.e., the wall 9 side (-X direction)) of the base main body 60. On the other hand, the second member 62 constitutes the front side of the base main body 60. The second member 62 supports the ventilation fan 51.

[0046] Fig. 6 is a front view of the first member 61. As shown in Fig. 6, the air passage F is formed in a U-shape when viewed from the front-rear direction X. The air passage F has an inlet 60p, a first region 60a, a folded region 60c, a second region 60b, and an outlet 62a.

[0047] The inlet 60p has a cylindrical shape extending in the vertical direction Z. The ventilation pipe 31 is connected to the inlet 60p. Air flows into the inlet 60p from the ventilation pipe 31. The inlet 60p opens upward. Therefore, the inlet 60p can guide condensation generated in the ventilation pipe 31 into the air passage F.

[0048] The first region 60a extends downward from the inlet 60p. The lower end of the first region 60a connects to the left end (-Y direction) of the turn-back region 60c. The cross-sectional shape of the flow path of the first region 60a is rectangular with its short side extending in the front-rear direction X. The cross-sectional area of ​​the flow path of the first region 60a increases continuously downward.

[0049] Here, "flow path cross section" refers to a cross section perpendicular to the air flow in the air duct. In addition, in this specification, a rectangular shape is interpreted as not including a square with four sides of the same length, but also including shapes with rounded corners at the intersections of the long and short sides.

[0050] The folded region 60c extends in the left-right direction Y. The folded region 60c connects the lower end of the first region 60a to the lower end of the second region 60b. The left end (-Y direction) of the folded region 60c connects to the first region 60a. The right end (+Y direction) of the folded region 60c connects to the second region 60b. The cross section of the flow path of the folded region 60c has a rectangular shape with its short side extending in the front-rear direction X.

[0051] In a typical air passage, a circular air passage shape can minimize air passage resistance. In contrast, the folded region 60c of the present embodiment not only functions as an air passage but also functions to stabilize pressure by accumulating air therein. Because the folded region 60c gently flows air within it, a rectangular cross-sectional shape of the flow path in the folded region 60c does not result in significant energy loss. Furthermore, by shaping the cross-sectional shape of the flow path in the folded region 60c as a rectangle with the short side extending in the front-rear direction X, the folded region 60c can accumulate more air within the limited space in the front-rear direction X. This further stabilizes the pressure within the folded region 60c. The first region 60a connected upstream of the folded region 60c is also continuously connected to the folded region 60c, thereby partially stabilizing pressure. Therefore, a rectangular cross-sectional shape of the flow path in the first region 60a can also accumulate more air within the first region 60a.

[0052] Here, the connection between the folded region 60c and the first region 60a is referred to as the first connection portion 60d, and the connection between the second region 60b and the folded region 60c is referred to as the second connection portion 60e. The first connection portion 60d is located at the left (-Y direction) end of the folded region 60c. On the other hand, the second connection portion 60e is located to the left (-Y direction) of the right (+Y direction) end (second side surface 63S) of the folded region 60c. The folded region 60c has a retention portion 60f that extends to the right (+Y direction) of the second connection portion 60e. The retention portion 60f extends to the right (+Y direction) of the second connection portion 60e.

[0053] By providing the stagnation section 60f in the turning region 60c, the air that flows from the first region 60a into the turning region 60c and flows along the outer wall surface stagnates in the stagnation section 60f and does not flow directly into the second region 60b, thereby slowing the flow of air in the turning region 60c and stabilizing the pressure in the turning region 60c.

[0054] The second region 60b extends upward from the folded region 60c. An outlet 62a is provided at the upper end of the second region 60b. That is, the second region 60b extends downward from the outlet 62a. The first region 60a and the second region 60b extend substantially parallel to each other when viewed in the front-rear direction X. The second region 60b is located to the right (+Y direction) of the first region 60a.

[0055] In this embodiment, the flow path cross-sectional area of ​​the lower end of the second region 60b (second connection portion 60e) is smaller than the flow path cross-sectional area of ​​the folded region 60c (cross-sectional area in a cross section perpendicular to the left-right direction Y). By making the flow path cross-sectional area of ​​the lower end of the second region 60b sufficiently small, the distribution of wind speed within the flow path cross-section can be reduced. This allows the air to be rectified in the second region 60b, improving the efficiency of air suction by the ventilation fan 51. Furthermore, by making the flow path cross-sectional shape of the second region 60b circular, air path resistance in the second region 60b can be reduced. This improves the efficiency of air suction from the air path F by the ventilation fan 51.

[0056] The flow path cross-sectional area of ​​the second region 60b increases continuously upward. Therefore, the air velocity gradually decreases as the air approaches the outlet 62a of the ventilation fan 51. According to this embodiment, a uniform flow with a high velocity is formed at the second connection portion 60e, and the air velocity is made gentle during suction by the ventilation fan 51, allowing stable suction from the ventilation fan 51.

[0057] The second region 60b has a forward bent portion 60q at a portion connected to the outflow port 62a. The second region 60b bends forward (in the +X direction) at the forward bent portion 60q. The outflow port 62a is provided in front of the forward bent portion 60q.

[0058] As shown in FIG. 5 , the base body 60 has stator blades 62f disposed within the air passage F. The stator blades 62f extend rearward (in the −X direction) from the outlet 62a toward the forward bent portion 60q. The stator blades 62f are plate-shaped. The stator blades 62f divide the flow path cross section of the forward bent portion 60q into two upper and lower regions. By providing the stator blades 62f, it is possible to ensure the amount of air flowing into the region below the stator blades 62f. As a result, the stator blades 62f homogenize the air flowing into the ventilation fan 51 from the outlet 62a.

[0059] The outlet 62a opens forward (in the +X direction). The outlet 62a is located to the right (in the +Y direction) of the inlet 60p. The outlet 62a is connected to the ventilation fan 51. The air blown forward (in the +X direction) from the outlet 62a enters the ventilation fan 51, and is then blown out through the exhaust port 46a via the duct member 52.

[0060] 6, the base body 60 has a bottom 65 located below the air passage F. The bottom 65 forms a lower wall of the air passage F. The bottom 65 is provided with a drain hole 61h, a valve housing portion 61k, and an induction hole 61j.

[0061] Figure 7 is a partial cross-sectional view of the bottom 65 including the drain hole 61h. As shown in Figure 7, the drain hole 61h is located below the air passage F. The drain hole 61h extends downward from the folded region 60c and connects the folded region 60c with the valve housing portion 61k. The valve housing portion 61k is a space provided below the air passage F to accommodate the drain valve 69. The guide hole 61j connects the valve housing portion 61k with the outside of the base body.

[0062] The drain valve 69 is disposed inside the valve housing portion 61k. The drain valve 69 faces the opening at the lower end of the drain hole 61h in the vertical direction Z. The drain valve 69 closes the drain hole 61h when the ventilation fan 51 is driven and negative pressure is created in the air passage F. The drain valve 69 opens the drain hole 61h when the ventilation fan 51 is stopped. Furthermore, even when the ventilation fan 51 is driven, the drain valve 69 opens the drain hole 61h due to the weight of the water when water accumulates in the turning region 60c of the air passage F.

[0063] In this embodiment, the ventilation piping 31 and the ventilation device main body 50 are disposed outdoors 7. When the ventilation device 30 is operated while the air conditioner 100 is heating the room, for example in winter, heated air from the room 8 passes through the ventilation piping 31 and the ventilation device main body 50. This air is cooled by outside air, causing condensation to form in the ventilation piping 31 and the ventilation device main body 50. The condensed water accumulates at the lower end of the folded region 60c in the air duct F. The condensed water in the air duct F flows into the valve housing portion 61k through the drainage hole 61h. The condensed water in the valve housing portion 61k is further drained to the outside of the ventilation device main body 50 through the guide hole 61j.

[0064] As shown in FIG. 6 , the base body 60 has an inner surface 63 that surrounds the air passage F. The inner surface 63 of the base body 60 also has a bottom surface 63P located below the folded region 60c, a top surface 63Q located above the folded region 60c, a first side surface 63R located to the left of the folded region 60c (in the −Y direction), and a second side surface 63S located to the right of the folded region 60c (in the +Y direction). The bottom surface 63P and the top surface 63Q face each other in the vertical direction Z. Similarly, the first side surface 63R and the second side surface 63S face each other in the left-right direction Y.

[0065] The first side surface 63R and the second side surface 63S both extend parallel to the vertical direction Z. The first side surface 63R extends continuously in the vertical direction Z from the left (-Y direction) side surface of the first region 60a. The second side surface 63S constitutes the left (-Y direction) side surface of the retention section 60f.

[0066] The bottom surface 63P has a first bottom surface portion 63a, a second bottom surface portion 63b, a step surface portion 63c, and a guide surface portion 63d. The bottom surface 63P is the upper surface of the bottom portion 65. Therefore, a drain hole 61h opens in the bottom surface 63P.

[0067] The first bottom surface portion 63a and the second bottom surface portion 63b both face upward. In this embodiment, the first bottom surface portion 63a and the second bottom surface portion 63b both extend parallel to the left-right direction Y. The second bottom surface portion 63b is located to the right (+Y direction) of the first bottom surface portion 63a. The second bottom surface portion 63b is located above (+Z direction) the first bottom surface portion 63a. In other words, the first bottom surface portion 63a and the second bottom surface portion 63b are arranged in a stepped manner.

[0068] Drainage holes 61h are opened in the first bottom surface portion 63a. According to this embodiment, the bottom surface 63P of the air passage F is provided with the first bottom surface portion 63a and the second bottom surface portion 63b, which are stepped. Therefore, condensation water concentrates and accumulates above the lower first bottom surface portion 63a. According to this embodiment, the level of condensation water above the drainage holes 61h can be increased compared to when the bottom surface 63P is a uniformly flat surface. When the ventilation device 30 is used for a long period of time, it is expected that the drainage performance of the drainage holes 61h will deteriorate due to the accumulation of dirt on the inner surfaces of the drainage holes 61h. According to this embodiment, even if only a small amount of condensation water accumulates in the folded region 60c, the level of condensation water above the drainage holes 61h can be increased, and water pressure due to the weight of the condensation water can be applied to the flow path of the drainage holes 61h. This makes it easier to smoothly drain condensation water, even from drainage holes 61h with reduced drainage performance.

[0069] The opening 61g of the drainage hole 61h in the first bottom surface portion 63a is located to the right (+Y direction) of the first connection portion 60d and to the left (-Y direction) of the second connection portion 60e. The opening 61g of the drainage hole 61h is located in the region where air flows in layers in the left-right direction Y between the first connection portion 60d and the second connection portion 60e. This makes it difficult for air to flow into the drainage hole 61h, thereby preventing the generation of the swirling airflow f4 shown in FIG. 7. According to this embodiment, the drainage hole 61h is unlikely to obstruct the airflow flowing along the first bottom surface portion 63a.

[0070] As shown in FIG. 7 , the first bottom surface portion 63a is provided with a downwardly recessed recess 66. The recess 66 has a recess bottom surface 66a where the drainage holes 61h open and a pair of recess side surfaces 66b extending upward from both ends of the recess bottom surface 66a in the left-right direction Y. The recess bottom surface 66a and the pair of recess side surfaces 66b are part of the first bottom surface portion 63a. Therefore, the recess bottom surface 66a and the pair of recess side surfaces 66b both face upward. The provision of the recess 66 in the first bottom surface portion 63a facilitates condensation water to be guided onto the first bottom surface portion 63a, particularly into the recess 66. Furthermore, because the drainage holes 61h open in the recess bottom surface 66a, condensation water on the bottom surface 63P can be smoothly drained through the drainage holes 61h, effectively preventing condensation water from remaining on the bottom surface 63P.

[0071] The pair of recess side surfaces 66b are inclined upward (in the +Z direction) in the left-right direction Y as they move away from the recess bottom surface 66a. The inclination angle γ of the pair of recess side surfaces 66b with respect to the left-right direction Y is small enough so as not to disturb the airflow flowing above and along the first bottom surface portion 63a. More specifically, the inclination angle γ of the pair of recess side surfaces 66b with respect to the left-right direction Y is preferably 20° or less. In this embodiment, the inclination angles γ of the pair of recess side surfaces 66b are equal to each other. However, the inclination angles γ of the pair of recess side surfaces 66b may be different from each other. In this case, when the inclination angle γ of each recess side surface 66b is 20° or less, the effect of not impeding the airflow is easily achieved.

[0072] The stepped surface portion 63c connects the first bottom surface portion 63a and the second bottom surface portion 63b. The stepped surface portion 63c slopes upward (+X) as it moves to the right (+Y direction). The boundary between the stepped surface portion 63c and the first bottom surface portion 63a and the boundary between the stepped surface portion 63c and the second bottom surface portion 63b are connected by smoothly curved surfaces. The stepped surface portion 63c faces the second connecting portion 60e in the vertical direction Z. In other words, the stepped surface portion 63c is disposed directly below the second connecting portion 60e.

[0073] In the folded region 60c, air flows mainly to the right (+Y direction). As a result, condensation water on the bottom surface 63P tends to flow to the right (+Y direction) and accumulate in the right corner. According to this embodiment, by providing the stepped surface portion 63c on the bottom surface 63P, condensation water on the bottom surface 63P is less likely to flow to the right (+Y direction) than the stepped surface portion 63c, and condensation water can be prevented from remaining in the right corner (+Y direction). As a result, the growth of mold due to condensation water can be prevented.

[0074] The guide surface portion 63d is disposed to the left (-Y direction) of the first bottom surface portion 63a. The guide surface portion 63d is an inclined surface that slopes downward as it moves to the right (+Y direction). The guide surface portion 63d is also a curved surface whose inclination angle with respect to the left-right direction Y continuously decreases as it moves to the right (+Y direction). The guide surface portion 63d smoothly connects to the first side surface 63R at its upper end and smoothly connects to the first bottom surface portion 63a at its lower end. The guide surface portion 63d faces the first region 60a in the vertical direction Z. The guide surface portion 63d guides the flow of air flowing from the first region 60a into the turning region 60c so that the flow direction of the air is smoothly directed to the right (+Y direction).

[0075] 6, the guide surface portion 63d is connected to the first bottom surface portion 63a at a gentler inclination angle than the stepped surface portion 63c. Here, within the range of the height H of the stepped surface portion 63c, the inclination angle α of the stepped surface portion 63c with respect to the left-right direction Y is greater than the inclination angle β of the guide surface portion 63d with respect to the left-right direction Y. Note that, here, the "inclination angle within the range of the height H of the stepped surface portion 63c" refers to the maximum inclination angles α and β of the stepped surface portion 63c and the guide surface portion 63d with respect to the left-right direction Y within the range of the vertical direction Z from the lower end to the upper end of the stepped surface portion 63c.

[0076] The top surface 63Q has a first top surface portion 63e and a second top surface portion (top surface portion) 63f. Both the first top surface portion 63e and the second top surface portion 63f face downward. In this embodiment, the first top surface portion 63e and the second top surface portion 63f extend parallel to the left-right direction Y. The first top surface portion 63e and the second top surface portion 63f are located on the same plane. The second top surface portion 63f is located to the right (+Y direction) of the first top surface portion 63e. The first top surface portion 63e faces the first bottom surface portion 63a in the vertical direction Z. The second top surface portion 63f faces the second bottom surface portion 63b in the vertical direction Z. The second top surface portion 63f is located above the retention portion 60f.

[0077] Air flowing into the airflow channel F from the inlet 60p flows downward (in the -Z direction) in the first region 60a and then flows into the turn-back region 60c, which has a sufficient volume. The provision of the retention section 60f in the turn-back region 60c slows the air flow and stabilizes the pressure. Furthermore, this air flows from the turn-back region 60c into the second region 60b at a uniform speed through the second connection section 60e, which has a narrowed cross-sectional area of ​​the flow path. The air that flows into the second region 60b flows upward (in the +Z direction) while gradually decreasing its flow velocity, then changes direction forward (in the +X direction) at the forward bend section 60q and flows into the interior of the ventilation fan 51 through the outlet 62a.

[0078] 8 is a front view of the first member 61, illustrating the airflows formed in the folded region 60c. When the ventilation fan 51 is driven, a main airflow f1, a stagnant airflow f2, and an entrained airflow f3 are formed in the folded region 60c. Although not described here, in addition to the main airflow f1, the stagnant airflow f2, and the entrained airflow f3, various other airflows are also formed in the folded region 60c, such as an airflow that flows along the first top surface portion 63e.

[0079] The main airflow f1 flows from the first region 60a into the turning region 60c and changes its flow direction to the right (+Y direction) along the guide surface 63d. The main airflow f1 then flows along the first bottom surface 63a, hits the stepped surface 63c, and changes its flow direction upward. The main airflow f1 flows upward above the stepped surface 63c and enters the second region 60b from the second connection portion 60e.

[0080] According to this embodiment, the stepped surface 63c is provided on the bottom surface 63P, so that the main airflow f1 can be formed within the turning region 60c, where the air hits the stepped surface 63c and flows upward. This promotes the flow of air within the turning region 60c into the second region 60b. In particular, the stepped surface 63c of this embodiment is inclined upward as it moves to the right (+Y direction). This allows the main airflow f1 to be directed upward without causing turbulence in the air flowing in the main airflow f1. Furthermore, the stepped surface 63c of this embodiment is positioned directly below the second connecting portion 60e. This allows the air that hits the stepped surface 63c and flows upward to efficiently flow from the second connecting portion 60e into the second region 60b.

[0081] 6 is larger than the inclination angle β of the guide surface portion 63d. The guide surface portion 63d guides the main airflow f1 and realizes a gradual change in direction of the main airflow f1, while the step surface portion 63c guides the main airflow f1 to the second region 60b by obstructing the flow of the main airflow f1. For this reason, it is preferable that the inclination angle β of the guide surface portion 63d be as gradual as possible, while it is preferable that the inclination angle α of the step surface portion 63c be larger than the inclination angle β of the guide surface portion 63d.

[0082] 7 is preferably smaller than the inclination angle α of the stepped surface 63c in the left-right direction Y. This configuration can prevent the main airflow f1 from being deflected upward by the recessed side surfaces 66b. When the inclination angles γ of the recessed side surfaces 66b are different from each other, it is preferable that the inclination angle γ of each recessed side surface 66b be smaller than the inclination angle α of the stepped surface 63c.

[0083] As shown in Figure 8, the stagnant airflow f2 is an airflow that swirls in the stagnant portion 60f in the turning region 60c. Because the main airflow f1 flows upward to the left of the stagnant portion 60f (in the -Y direction), an upward airflow is formed within the stagnant portion 60f along with the main airflow f1. This airflow is guided to the right (in the +Y direction) by the second top surface 63f located above the stagnant portion 60f, to the downward direction by the second side surface 63S, and to the left (in the -Y direction) by the second bottom surface 63b, and swirls within the stagnant portion 60f.

[0084] The stagnant airflow f2 guides droplets D of condensed water adhering to the second bottom surface portion 63b toward the first bottom surface portion 63a. According to the present embodiment, by forming the stagnant airflow f2 in the stagnant portion 60f, it is possible to prevent the droplets D from remaining on the second bottom surface portion 63b. Furthermore, the stagnant airflow f2 also promotes the evaporation of the droplets D adhering to the second bottom surface portion 63b, thereby more effectively preventing the droplets D from remaining on the second bottom surface portion 63b. Furthermore, the stagnant airflow f2 makes it difficult for the condensed water to remain in corners on one side (+Y direction) in the first direction (left-right direction Y), thereby preventing the growth of mold caused by the condensed water.

[0085] The entrained airflow f3 is provided above the stagnant airflow f2. The entrained airflow f3 is formed when air flowing to the right (+Y direction) above the stagnant airflow f2 collides with the second side surface 63S and flows upward. The entrained airflow f3 flows from near the upper end of the second side surface 63S along the second top surface 63f to the left (-Y direction) and flows into the second region 60b from the second connection portion 60e.

[0086] The formation of the entrained airflow f3 allows the second region 60b to draw air not only from the region directly below the second connection portion 60e but also from the region directly below the second top surface portion 63f. This allows more air to be drawn into the second region 60b from the folded region 60c, improving the intake efficiency of the ventilation fan 51. In particular, in this embodiment, the second top surface portion 63f extends parallel to the left-right direction Y. Therefore, compared to a case in which the second top surface portion 63f slopes downward as it moves away from the second connection portion 60e in the left-right direction Y, a wider region below the second top surface portion 63f can be secured, allowing more air to flow into the second region 60b.

[0087] Furthermore, the entrained airflow f3 flows into the second region 60b, being entrained around the outer edge of the opening of the second region 60b at the second connecting portion 60e, and flows toward the outer periphery of the cross section of the airflow path in the second region 60b. By ensuring a sufficient air volume of the entrained airflow f3, it is possible to prevent the air volume from concentrating near the center of the cross section of the airflow path flowing upward through the second region 60b, and to make the air volume distribution in the cross section of the airflow path in the second region 60b uniform. Note that this entrained airflow f3 is formed not only directly below the second top surface portion 63f, but also directly below the first top surface portion 63e.

[0088] The effect of increasing the amount of air flowing from the second connection portion 60e into the second region 60b by the entrained airflow f3 can also be achieved with a modified second top surface portion (top surface portion) 163f shown by imaginary lines in Figure 8. The modified second top surface portion 63f extends at an angle upward as it moves away from the second connection portion 60e. In this case, the second top surface portion 163f has an upwardly recessed shape, and the second region 60b can draw air from inside the recessed portion formed by the second top surface portion 163f.

[0089] <Summary> The air conditioner 100 of this embodiment includes an indoor unit 20, an outdoor unit 10, a circulation path section (refrigerant piping) 18, and a ventilation device 30. The indoor unit 20 is installed in the room 8 and has a heat exchanger (first heat exchanger) 22. The outdoor unit 10 is installed in the outdoor space 7 and has a heat exchanger (second heat exchanger) 13. The circulation path section 18 passes through a through-hole 9h in a wall 9 separating the room 8 from the outdoor space 7, connecting the heat exchanger 22 of the indoor unit 20 to the heat exchanger 13 of the outdoor unit 10. The ventilation device 30 ventilates the air in the room 8. The ventilation device 30 includes a ventilation pipe 31, a ventilation fan 51, and a base main body 60. The ventilation pipe 31 passes through the through-hole 9h from the indoor unit 20 and is drawn out to the outdoor space 7. An air passage F connecting the ventilation pipe 31 and the ventilation fan 51 is provided in the base main body 60. The air passage F has an inlet 60p, an outlet 62a, a first region 60a, a second region 60b, and a folded region 60c. The inlet 60p is connected to the ventilation pipe 31. The outlet 62a is located on one side of the inlet 60p in a first direction (+Y direction) perpendicular to the vertical direction and is connected to the ventilation fan 51. The first region 60a extends downward from the inlet 60p. The second region 60b extends downward from the outlet 62a. The folded region 60c connects the lower ends of the first region 60a and the second region 60b. The base body 60 has a bottom surface 63P located below the folded region 60c on the inner side surface 63 surrounding the air passage F. The bottom surface 63P has a first bottom surface portion 63a, a second bottom surface portion 63b, and a stepped surface portion 63c. The first bottom surface portion 63a faces upward. The second bottom surface portion 63b is located on one side in the first direction (+Y direction) and above the first bottom surface portion 63a and faces upward. The stepped surface portion 63c connects the first bottom surface portion 63a and the second bottom surface portion 63b. A drainage hole 61h that penetrates the base main body 60 opens in the first bottom surface portion 63a. The stepped surface portion 63c is inclined toward the upward position (+Z direction) as it moves toward one side in the first direction (+Y direction).

[0090] According to the above-described configuration, as shown in FIG. 3 , the ventilation fan 51 is disposed inside the ventilation device main body 50 outside the room 7. This prevents noise caused by the operation of the ventilation fan 51 from being transmitted to the room 8, thereby maintaining a quiet interior space inside the room 8. On the other hand, disposing the ventilation fan 51 outside the room 7 makes it easier for condensation to form inside the ventilation device main body 50. According to the above-described configuration, as shown in FIG. 6 , the air passage F is formed in a U-shape in the first region 60a, the folded region 60c, and the second region 60b. This allows condensation generated in the ventilation pipe 31 and the air passage F to be easily retained in the folded region 60c, which corresponds to the lower end of the U-shape, thereby preventing condensation from entering the ventilation fan 51 located downstream of the air passage F. Furthermore, condensation accumulated in the air passage F can be discharged to the outside through the drainage hole 61h provided in the bottom surface 63P of the folded region 60c.

[0091] According to the above-described configuration, the bottom surface 63P of the air passage F is provided with a first bottom surface portion 63a and a second bottom surface portion 63b that are staggered, and the drainage hole 61h opens to the first bottom surface portion 63a, which is located below. Therefore, compared to when the bottom surface 63P is a uniformly flat surface, it is easier to increase the level of condensed water above the drainage hole 61h. As a result, water pressure due to the weight of condensed water can be applied to the flow path of the drainage hole 61h, improving the drainage performance of the drainage hole 61h.

[0092] According to the above-described configuration, a stepped surface 63c facing the other side of the first direction (-Y direction) is provided between the first bottom surface 63a and the second bottom surface 63b. Therefore, as the air in the folded region 60c flows through the folded region 60c toward one side of the first direction (+Y direction), it hits the stepped surface 63c and flows upward. That is, the stepped surface 63c guides the air to the second region 60b, smoothing the flow of air from the folded region 60c to the second region 60b. In particular, according to the above-described configuration, the stepped surface 63c is inclined upward (+Z direction) as it moves toward one side of the first direction (+Y direction), thereby preventing significant turbulence in the airflow. Furthermore, according to the above-described configuration, the stepped surface portion 63c is provided on the bottom surface 63P, so that the condensed water on the bottom surface 63P is less likely to flow to one side in the first direction (the +Y direction) than the stepped surface portion 63c. This makes it less likely that the condensed water will remain in the corners, thereby suppressing the occurrence of mold due to the condensed water.

[0093] In the air conditioner 100 of this embodiment, when viewed from the vertical direction Z, at least a portion of the stepped surface 63c overlaps the connection (second connection 60e) between the folded region 60c and the second region 60b. With this configuration, the stepped surface 63c is located directly below the second connection 60e. This makes it easier for the air flow that hits the stepped surface 63c and flows upward from the second connection 60e to flow into the second region 60b.

[0094] In the air conditioner 100 of this embodiment, the folding region 60c has a retention portion 60f extending toward one side of the first direction (+Y direction) from the connection (second connection portion 60e) between the folding region 60c and the second region 60b. With this configuration, the folding region 60c has the retention portion 60f. Therefore, air that flows from the first region 60a into the folding region 60c and flows along the outer wall surface of the folding region 60c is retained in the retention portion 60f and is less likely to flow directly into the second region 60b. This allows the air flow in the folding region 60c to be slowed, stabilizing the pressure and supplying a stable volume of air to the second region 60b located downstream of the folding region 60c. Furthermore, as shown in FIG. 8 , with the above-described configuration, a stagnant airflow f2 is generated in the retention portion 60f, flowing toward the other side of the first direction (-Y direction) along the second bottom surface portion 63b. Therefore, when droplets D of condensed water adhere to the second bottom surface portion 63b, the stagnant airflow f2 can guide the droplets D toward the first bottom surface portion 63a, thereby preventing the droplets D from remaining on the second bottom surface portion 63b. Furthermore, the stagnant airflow f2 also promotes evaporation of the droplets D adhering to the second bottom surface portion 63b, thereby more effectively preventing the droplets D from remaining on the second bottom surface portion 63b. Furthermore, the stagnant airflow f2 makes it difficult for condensed water to remain in corners on one side of the first direction (+Y direction), thereby preventing the growth of mold due to condensed water.

[0095] In the air conditioner 100 of this embodiment, the base body 60 has second top surface portions 63f, 163f located above the retention portion 60f on the inner surface 63 that surrounds the air passage F. The second top surface portions 63f, 163f extend parallel to the first direction (left-right direction Y) or extend at an angle that increases upward as they move away from the second connection portion 60e.

[0096] According to the above-described configuration, an entrained airflow f3 is formed in the stagnation portion 60f, flowing leftward (in the −Y direction) along the second top surface 63f and flowing from the second connection portion 60e into the second region 60b. The formation of the entrained airflow f3 allows the second region 60b to draw air not only from the region directly below the second connection portion 60e but also from the region directly below the second top surface 63f. In particular, since the second top surface 63f has the above-described relationship in the left-right direction Y, a wide region below the second top surface 63f can be secured, allowing more air to flow into the second region 60b.

[0097] In the air conditioner 100 of this embodiment, the opening 61g of the drainage hole 61h in the first bottom surface portion 63a is located on one side in the first direction (+Y direction) of the connection (first connection 60d) between the first region 60a and the folded region 60c, and on the other side in the first direction (-Y direction) of the connection (second connection 60e) between the second region 60b and the folded region 60c. This configuration allows the opening 61g of the drainage hole 61h to be located in the region where the main airflow f1 flows in layers in the left-right direction Y. This makes it difficult for air to flow inside the drainage hole 61h and therefore less likely to obstruct the air flow in the folded region 60c.

[0098] In the air conditioner 100 of this embodiment, the bottom surface 63P has a guide surface portion 63d that faces the first region 60a in the vertical direction Z. The guide surface portion 63d slopes downward toward one side of the first direction (the +Y direction). As shown in FIG. 6 , within the range of the height H of the step surface portion 63c, the slope angle α of the step surface portion 63c with respect to the first direction (the left-right direction Y) is greater than the slope angle β of the guide surface portion 63d with respect to the first direction (the left-right direction Y). Because air flowing from the first region 60a into the turning region 60c flows along the guide surface portion 63d and gradually changes direction from below to the right (the +Y direction), it is preferable that the slope angle β of the guide surface portion 63d be as gradual as possible. Furthermore, since the air flowing through the turning region 60c to one side of the first direction (+Y direction) changes direction relatively abruptly upward when it hits the step surface portion 63c, it is preferable that the inclination angle α of the step surface portion 63c be greater than the inclination angle β of the guide surface portion 63d.

[0099] In the air conditioner 100 of this embodiment, a downwardly recessed recess 66 is provided in the first bottom surface 63a. The recess 66 has a recess bottom surface 66a and a pair of recess side surfaces 66b. A drain hole 61h is opened in the recess bottom surface 66a. The pair of recess side surfaces 66b extend upward from both ends of the recess bottom surface 66a in the first direction (left-right direction Y). The pair of recess side surfaces 66b are inclined in directions that move away from each other in the first direction (left-right direction Y) as they extend upward. The inclination angle γ of the pair of recess side surfaces 66b with respect to the first direction (left-right direction Y) is smaller than the inclination angle α of the step surface portion 63c with respect to the first direction (left-right direction Y). With this configuration, the recess 66 is provided in the first bottom surface 63a, making it easier for condensation water to be guided onto the first bottom surface 63a, particularly into the recess 66. Furthermore, because the drainage holes 61h are opened in the bottom surface 66a of the recess, condensation on the bottom surface 63P can be smoothly drained through the drainage holes 61h, effectively preventing condensation from remaining on the bottom surface 63P. According to the above-described configuration, the inclination angle γ of the recess side surface 66b is smaller than the inclination angle α of the step surface portion 63c, preventing air from colliding with the recess side surface 66b. Therefore, the recess 66 is less likely to obstruct the air flow in the folded region 60c.

[0100] In the air conditioner 100 of this embodiment, the inclination angle γ of the pair of recess side surfaces 66b with respect to the first direction (left-right direction Y) is 20° or less. With this configuration, by setting the inclination angle γ of the recess side surfaces 66b to 20° or less, the recess 66 is less likely to obstruct the flow of air in the folded region 60c.

[0101] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the configurations of the above-described embodiments. For example, in the above-described embodiments, the first bottom surface portion 63a and the second bottom surface portion 63b are both horizontally extending surfaces, but these surfaces may be inclined relative to the horizontal plane. Similarly, the configurations of the above-described embodiments are merely examples of the surfaces surrounding the air passage, and the surfaces may be inclined relative to the above-described configurations. Furthermore, in the above-described configurations, the first direction is parallel to the left-right direction Y, but the first direction may be parallel to the front-rear direction. In other words, the air passage F may be U-shaped when viewed from the left-right direction Y.

[0102] 7...outdoor, 8...indoor, 9...wall, 9h...through hole, 10...outdoor unit, 13...heat exchanger (second heat exchanger), 18...circulation path section (refrigerant piping), 19...refrigerant, 20...indoor unit, 22...heat exchanger (first heat exchanger), 30...ventilation device, 31...ventilation piping, 51...ventilation fan, 60...base body, 60a...first region, 60b...second region, 60c...folded region, 60d...first connection section (connection section), 60e...second connection section (connection section), 60f...stagnation section, 6 0p...Inlet, 61g...Opening, 61h...Drain hole, 62a...Outlet, 63...Inner surface, 63a...First bottom part, 63b...Second bottom part, 63c...Step surface part, 63d...Guide surface part, 63f, 163f...Second top part (top part) , 63P...bottom, 63Q...top, 66...recess, 66a...recess bottom, 66b...recess side, 80...base, 100...air conditioner, F...air path, H...height, Y...horizontal direction (first direction), Z...vertical direction, α, β, γ...inclination angle

Claims

1. an indoor unit installed indoors and having a first heat exchanger; an outdoor unit installed outdoors and having a second heat exchanger; a refrigerant pipe passing through a through hole in a wall separating the indoor space from the outdoor space and connecting the first heat exchanger and the second heat exchanger; A ventilation device for ventilating the air in the room, The ventilation device includes: A ventilation pipe extending from the room through the through hole to the outside of the room; Ventilation fans and A base body in which an air passage connecting the ventilation pipe and the ventilation fan is provided, The air passage is an inlet connected to the ventilation pipe; An outlet that is located on one side of the inlet in a first direction perpendicular to the vertical direction and connected to the ventilation fan; a first region extending downward from the inlet; a second region extending downward from the outlet; a folded region connecting lower ends of the first region and the second region, The base body has a bottom surface that is located below the folded-back region on an inner surface surrounding the air passage, The bottom surface is a first bottom portion facing upward; a second bottom surface portion located on one side in the first direction and above the first bottom surface portion and facing upward; a step surface portion connecting the first bottom surface portion and the second bottom surface portion, A drain hole penetrating the base body is opened in the first bottom surface portion, The step surface portion is inclined in an upward direction toward one side in the first direction. Air conditioner.

2. When viewed in the vertical direction, at least a portion of the step surface portion overlaps a connection portion between the folded-back region and the second region. The air conditioner according to claim 1.

3. the folded region has a retention portion extending to one side in the first direction with respect to a connection portion between the folded region and the second region; The air conditioner according to claim 1.

4. The base body has a top surface portion located above the retention portion on an inner surface surrounding the air passage, The top surface portion extends parallel to the first direction or inclines in an upward direction as it moves away from the connection portion. The air conditioner according to claim 3.

5. an opening of the drainage hole in the first bottom surface portion is located on one side in the first direction of a connection portion between the first region and the folded-back region, and on the other side in the first direction of a connection portion between the second region and the folded-back region; The air conditioner according to claim 1.

6. the bottom surface has a guide surface portion facing the first region in the vertical direction, The guide surface portion is inclined downward toward one side in the first direction, Within a range of the height of the step surface portion, an inclination angle of the step surface portion with respect to the first direction is larger than an inclination angle of the guide surface portion with respect to the first direction. The air conditioner according to claim 1.

7. The first bottom surface portion is provided with a recess recessed downward, The recessed portion is A bottom surface of the recess where the drainage hole is open; a pair of recess side surfaces extending upward from both ends of the recess bottom surface in the first direction, The pair of recess side surfaces are inclined in a direction away from each other in the first direction as they extend upward, an inclination angle of the pair of recess side surfaces with respect to the first direction is smaller than an inclination angle of the step surface portion with respect to the first direction; An air conditioner according to any one of claims 1 to 6.

8. The inclination angle of the pair of recess side surfaces with respect to the first direction is 20° or less. The air conditioner according to claim 7.