Indoor unit and air conditioner

Abstract

One embodiment of an indoor unit according to the present disclosure is an indoor unit of an air conditioner, is attached to a ceiling, and comprises: a housing in which a blowout port and a suction port open downwardly are formed; a heat exchanger housed inside the housing; a blower that is housed inside the housing and generates an air flow passing through the heat exchanger; and a refrigerant sensor that is housed inside the housing and is capable of detecting the refrigerant. Air sucked into the housing from the suction port by driving of the blower passes through the heat exchanger, then passes through the blower and is blown out from the blowout port. The refrigerant sensor is positioned above the suction port and below the upper end of the heat exchanger.

Description

Indoor units and air conditioners

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

[0002] For example, as described in Patent Document 1, an indoor unit of an air conditioner is known that is provided with a sensor for detecting leaking refrigerant gas.

[0003] Patent No. 4599699

[0004] In wall-mounted indoor units and floor-standing indoor units such as those described in Patent Document 1, leaked refrigerant gas is likely to accumulate around the floor and inside the indoor unit, and therefore the placement of a sensor to detect refrigerant gas has been studied. On the other hand, in ceiling-mounted indoor units, leaked refrigerant gas is less likely to accumulate inside the room than in wall-mounted and floor-standing indoor units due to factors such as the large distance from the floor. For this reason, there has been little study into placing a sensor inside a ceiling-mounted indoor unit to detect leaked refrigerant gas. However, due to changes in the types of refrigerants used in air conditioners, there is a growing demand for placing a sensor inside a ceiling-mounted indoor unit to detect leaked refrigerant gas.

[0005] In view of the above circumstances, one of the objects of the present disclosure is to provide an indoor unit that is attached to a ceiling and has a structure that can suitably detect leaking refrigerant, and an air conditioner that is equipped with such an indoor unit.

[0006] One aspect of the indoor unit according to the present disclosure is an indoor unit for an air conditioner, which is mounted on a ceiling and comprises: a housing having an intake port and an exhaust port that open downward; a heat exchanger housed inside the housing; a blower housed inside the housing and generating an airflow that passes through the heat exchanger; and a refrigerant sensor housed inside the housing and capable of detecting refrigerant, wherein air drawn into the housing from the intake port by driving the blower passes through the heat exchanger, then passes through the blower and is blown out from the exhaust port, and the refrigerant sensor is located above the intake port and below the upper end of the heat exchanger.

[0007] One aspect of an air conditioner according to the present disclosure includes the above-described indoor unit and an outdoor unit.

[0008] According to the present disclosure, leaking refrigerant can be suitably detected in an indoor unit that is attached to a ceiling.

[0009] 7 is a schematic diagram showing a general configuration of an air conditioner according to Embodiment 1. FIG. 1 is a perspective view showing an indoor unit according to Embodiment 1. FIG. 2 is a cross-sectional view showing the indoor unit according to Embodiment 1. FIG. 3 is a cross-sectional view showing the indoor unit according to Embodiment 1, taken along IV-IV in FIG. 3. FIG. 4 is a perspective view showing a part of a heat exchanger, a cover member, and a refrigerant sensor device according to Embodiment 1. FIG. 5 is an exploded perspective view showing a part of a heat exchanger, a cover member, and a refrigerant sensor device according to Embodiment 1. FIG. 6 is a perspective view showing a part of the heat exchanger, a cover member, and a refrigerant sensor device according to Embodiment 1. FIG. 7 is a cross-sectional view showing a part of the indoor unit according to Embodiment 1, taken along X-X in FIG. 4. FIG. 8 is a perspective view showing a part of the indoor unit according to Embodiment 1, viewed from a different angle than FIG. 7. FIG. 9 is a perspective view showing a first partition member according to Embodiment 1. FIG. 10 is a cross-sectional view showing an indoor unit according to Embodiment 2. FIG. 11 is a cross-sectional view showing the indoor unit according to Embodiment 2, taken along XIV-XIV in FIG. 13. FIG. 12 is a cross-sectional view showing an indoor unit according to Embodiment 3. FIG. 13 is a perspective view showing an indoor unit according to Embodiment 4. Fig. 10 is a cross-sectional view showing an indoor unit according to Embodiment 4. Fig. 11 is a schematic diagram showing an air conditioner according to Embodiment 5.

[0010] 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.

[0011] 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 "first horizontal direction X," the horizontal direction along the Y-axis is referred to as the "second horizontal direction Y," and the vertical direction is referred to as the "vertical direction Z." The first horizontal direction X, the second horizontal direction Y, and the vertical direction Z are perpendicular to each other. The side of the vertical direction Z toward which the Z-axis arrow points (+Z side) is the upper side, and the side of the vertical direction Z opposite to the side toward which the Z-axis arrow points (-Z side) is the lower side. In the following description, the side of the first horizontal direction X toward which the X-axis arrow points (+X side) is referred to as the "first horizontal direction one side," and the side of the first horizontal direction X opposite to the side toward which the X-axis arrow points (-X side) is referred to as the "first horizontal direction other side." The side of the second horizontal direction Y toward which the Y-axis arrow points (+Y side) is called the "one side of the second horizontal direction," and the opposite side of the second horizontal direction Y to which the Y-axis arrow points (-Y side) is called the "other side of the second horizontal direction." Furthermore, with respect to a certain object, the side closer to the center of the indoor unit in the second horizontal direction Y is called the "inner side of the second horizontal direction," and the side farther from the center of the indoor unit in the second horizontal direction Y is called the "outer side of the second horizontal direction."

[0012] Embodiment 1. Fig. 1 is a schematic diagram showing the general configuration of an air conditioner 100 in Embodiment 1. As shown in Fig. 1, the air conditioner 100 includes an outdoor unit 10, an indoor unit 20, and a refrigerant circuit section 18 that connects the outdoor unit 10 and the indoor unit 20. The outdoor unit 10 is disposed outdoors. The indoor unit 20 is disposed indoors. The outdoor unit 10 and the indoor unit 20 are connected to each other by the refrigerant circuit section 18, through which refrigerant 19 circulates.

[0013] The air conditioner 100 can adjust the temperature of the indoor air by exchanging heat between the refrigerant 19 flowing through the refrigerant circuit 18 and the air in the room where the indoor unit 20 is located. Examples of the refrigerant 19 include fluorine-based refrigerants or hydrocarbon-based refrigerants with low global warming potential (GWP). Examples of the refrigerant 19 include a single refrigerant selected from R1234yf, R1234ze, R32, and R290, a mixture of two or more of these refrigerants, or a mixture of any of these refrigerants with another refrigerant. Examples of the refrigerant 19 include a mixture of R1132(E) and R1123. Examples of refrigerant 19 include a mixed refrigerant of R516A, R445A, R444A, R454C, R444B, R454A, R455A, R457A, R459B, R452B, R454B, R447B, R447A, R446A, and R459A. The density of refrigerant 19 in gaseous form is greater than the density of air.

[0014] The outdoor unit 10 has a 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 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.

[0015] The compressor 12, the heat exchanger 13, the flow rate control valve 14, and the four-way valve 16 are provided in a portion of the refrigerant circuit unit 18 that is located inside the housing 11. The compressor 12, the heat exchanger 13, the flow rate control valve 14, and the four-way valve 16 are connected by a portion of the refrigerant circuit unit 18 that is located inside the housing 11.

[0016] The four-way valve 16 is provided in a portion of the refrigerant circuit unit 18 that is connected to the discharge side of the compressor 12. The four-way valve 16 switches some of the paths in the refrigerant circuit unit 18, thereby reversing the direction of the refrigerant 19 flowing through the refrigerant circuit unit 18. When the paths connected by the four-way valve 16 are the paths shown by solid lines on the four-way valve 16 in Fig. 1, the refrigerant 19 flows through the refrigerant circuit unit 18 in the direction shown by the solid arrows in Fig. 1. On the other hand, when the paths connected by the four-way valve 16 are the paths shown by dashed lines on the four-way valve 16 in Fig. 1, the refrigerant 19 flows through the refrigerant circuit unit 18 in the direction shown by the dashed arrows in Fig. 1.

[0017] The indoor unit 20 includes a housing 21, a heat exchanger 22, a blower 23, a control unit 24, an alarm unit 25, and a refrigerant sensor device 30. The housing 21 houses the heat exchanger 22, the blower 23, the control unit 24, and the refrigerant sensor device 30. The indoor unit 20 is capable of cooling operation to cool the air in the room in which the indoor unit 20 is located, and heating operation to warm the air in the room in which the indoor unit 20 is located.

[0018] When the indoor unit 20 is in cooling operation, the refrigerant 19 flowing through the refrigerant circuit 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 through the refrigerant circuit 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.

[0019] On the other hand, when the indoor unit 20 is in heating operation, the refrigerant 19 flowing through the refrigerant circuit 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 through the refrigerant circuit 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. During 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.

[0020] Next, the indoor unit 20 will be described in more detail. Fig. 2 is a perspective view showing the indoor unit 20. Fig. 3 is a cross-sectional view showing the indoor unit 20. Fig. 4 is a cross-sectional view showing the indoor unit 20, taken along line IV-IV in Fig. 3.

[0021] As shown in Figures 2 and 3, in the first embodiment, the indoor unit 20 is an indoor unit attached to the ceiling C. More specifically, the indoor unit 20 is a ceiling-embedded indoor unit that is installed by being embedded in the ceiling C. As shown in Figure 3, the ceiling C is a double ceiling having a ceiling slab (not shown) and a ceiling panel W spaced apart below the ceiling slab. The ceiling slab is a structure such as a slab or beam on the upper floor. The ceiling panel W is a plate with its panel surface facing the vertical direction Z. The underside of the ceiling panel W faces the room. The indoor unit 20 is installed on the ceiling C with a portion embedded in the ceiling space CA via a through-hole Wa provided in the ceiling panel W. The ceiling space CA is a space provided between the ceiling slab (not shown) and the ceiling panel W in the vertical direction Z. The through-hole Wa penetrates the ceiling panel W in the vertical direction Z.

[0022] In the first embodiment, the blower 23 housed in the housing 21 of the indoor unit 20 is a crossflow fan. As shown in FIG. 4 , the blower 23 has an impeller 23a that rotates about a rotation axis R extending in the second horizontal direction Y. The rotation axis R is an imaginary axis. As shown in FIG. 3 , in the first embodiment, the rotation axis R is located above the center of the housing 21 in the vertical direction Z. The impeller 23a has a substantially circular shape when viewed in the second horizontal direction Y. In the first embodiment, the impeller 23a is disposed in the center of the first horizontal direction X in the upper portion of the interior of the housing 21. As shown in FIG. 4 , the blower 23 has a motor 23b that rotates the impeller 23a about the rotation axis R. The motor 23b is located on the other side (-Y side) of the impeller 23a in the second horizontal direction.

[0023] In the first embodiment, the heat exchanger 22 of the indoor unit 20 extends in the second horizontal direction Y. As shown in FIG. 3 , in the first embodiment, the heat exchanger 22 of the indoor unit 20 has a first heat exchange section 22a and a second heat exchange section 22b. The first heat exchange section 22a is located on the other side (-X side) of the blower 23 in the first horizontal direction and diagonally below. When viewed in the second horizontal direction Y, the first heat exchange section 22a extends in a direction that is closer to the other side in the first horizontal direction as it moves upward. The second heat exchange section 22b is located on one side (+X side) of the first heat exchange section 22a in the first horizontal direction. The second heat exchange section 22b is located on one side (+X side) of the blower 23 in the first horizontal direction and diagonally below. When viewed in the second horizontal direction Y, the second heat exchange section 22b extends in a direction that is closer to one side in the first horizontal direction as it moves upward. The upper end of the first heat exchange section 22 a is located higher than the upper end of the second heat exchange section 22 b. In the first embodiment, the upper end of the first heat exchange section 22 a is the upper end of the heat exchanger 22. The upper end of the heat exchanger 22 is the uppermost part of the heat exchanger 22.

[0024] The upper portion of the first heat exchange section 22a and the upper portion of the second heat exchange section 22b are arranged with the impeller 23a of the blower 23 sandwiched between them in the first horizontal direction X. The lower end of the first heat exchange section 22a and the lower end of the second heat exchange section 22b are located below the impeller 23a of the blower 23 and are arranged adjacent to each other in the first horizontal direction X. The lower end of the first heat exchange section 22a and the lower end of the second heat exchange section 22b are connected to each other. The first heat exchange section 22a and the second heat exchange section 22b are arranged along a V-shape that opens upward when viewed in the second horizontal direction Y.

[0025] The first heat exchange unit 22a and the second heat exchange unit 22b each include a heat exchanger body 22c and a refrigerant pipe 22g fixed to the heat exchanger body 22c. The heat exchanger body 22c of the first heat exchange unit 22a extends upward in the second horizontal direction Y toward the other side (-X side) of the first horizontal direction. The heat exchanger body 22c of the second heat exchange unit 22b extends upward in the second horizontal direction Y toward one side (+X side) of the first horizontal direction. Each heat exchanger body 22c is formed, for example, by a plurality of plate members (fins) arranged with gaps in between in the second horizontal direction Y. Refrigerant 19 flows through the refrigerant pipe 22g from the outdoor unit 10 to the indoor unit 20.

[0026] Fig. 5 is a perspective view showing a portion of the heat exchanger 22, a cover member 80 (described later), and the refrigerant sensor device 30. Fig. 6 is an exploded perspective view showing a portion of the heat exchanger 22, a cover member 80 (described later), and the refrigerant sensor device 30. As shown in Figs. 5 and 6, the refrigerant pipes 22g of the first heat exchange section 22a and the second heat exchange section 22b each have a plurality of extension pipes 22f extending in the second horizontal direction Y and a connecting pipe (protruding portion) 22e connecting the ends of the two extension pipes 22f in the second horizontal direction Y. The plurality of extension pipes 22f penetrate the heat exchanger body 22c in the second horizontal direction Y.

[0027] The connecting pipe portion 22e is a protruding portion that protrudes in the second horizontal direction Y beyond the heat exchanger body 22c. The connecting pipe portion 22e protrudes outward in the second horizontal direction from the heat exchanger body 22c. In the first embodiment, the connecting pipe portion 22e is a U-shaped pipe portion. In the first embodiment, the connecting pipe portion 22e is a pipe portion that is called a U-bend pipe or a hairpin pipe. As shown in FIG. 4 , the connecting pipe portion 22e includes a connecting pipe portion 22e that protrudes to one side (+Y side) in the second horizontal direction beyond the heat exchanger body 22c, and a connecting pipe portion 22e that protrudes to the other side (-Y side) in the second horizontal direction beyond the heat exchanger body 22c.

[0028] The indoor unit 20 is equipped with a drain pan 40 located below the heat exchanger 22. The drain pan 40 is a member that catches condensation water that forms on the outer surface of the heat exchanger 22 during cooling operation, etc. The condensation water caught by the drain pan 40 accumulates inside the drain pan 40. The condensation water that accumulates in the drain pan 40 is discharged to the outside of the indoor unit 20 by a drain pump (not shown).

[0029] The drain pan 40 is located below the blower 23 at a distance. As shown in Fig. 3, in the first embodiment, the drain pan 40 is located below the first heat exchange section 22a and the second heat exchange section 22b. Fig. 7 is a perspective view showing a part of the indoor unit 20. As shown in Fig. 7, the drain pan 40 has a substantially H-shape when viewed from below. The drain pan 40 has a first drain pan section 41, a second drain pan section 42, and a third drain pan section 43.

[0030] The first drain pan 41 extends in the second horizontal direction Y. As shown in FIG. 3 , the first drain pan 41 is located below the lower ends of the first heat exchanger 22a and the second heat exchanger 22b. The first drain pan 41 has a base 41a, a side wall 41b, and a side wall 41c. The base 41a is located below the lower ends of the first heat exchanger 22a and the second heat exchanger 22b. The side wall 41b protrudes obliquely upward from an end of the base 41a on the other side (−X side) in the first horizontal direction toward the other side in the first horizontal direction. The side wall 41c protrudes obliquely upward from an end of the base 41a on one side (+X side) in the first horizontal direction toward the one side in the first horizontal direction. The side wall portion 41b and the side wall portion 41c are arranged in the first horizontal direction X so as to sandwich the lower end portion of the first heat exchange portion 22a and the lower end portion of the second heat exchange portion 22b therebetween.

[0031] The end of the first drain pan 41 on the other side (-X side) in the first horizontal direction is located closer to one side (+X side) in the first horizontal direction than the end of the first heat exchanger 22 a on the other side in the first horizontal direction. The end of the first drain pan 41 on one side (+X side) in the first horizontal direction is located closer to the other side in the first horizontal direction than the end of the second heat exchanger 22 b on one side in the first horizontal direction.

[0032] As shown in FIG. 7 , the second drain pan 42 is connected to the end of the first drain pan 41 on one side in the second horizontal direction (+Y side). The second drain pan 42 extends in the first horizontal direction X. The second drain pan 42 protrudes on both sides in the first horizontal direction X beyond the end of the first drain pan 41 on one side in the second horizontal direction. The third drain pan 43 is connected to the end of the first drain pan 41 on the other side in the second horizontal direction (-Y side). The third drain pan 43 extends in the first horizontal direction X. The third drain pan 43 protrudes on both sides in the first horizontal direction X beyond the end of the first drain pan 41 on the other side in the second horizontal direction.

[0033] 4, the second drain pan 42 is located below the connecting pipes 22e of the first heat exchanger 22a and the second heat exchanger 22b that protrude to one side (the +Y side) in the second horizontal direction. A piping group 60 that is connected to the refrigerant piping 22g of the heat exchanger 22 is located above the second drain pan 42. The piping group 60 includes connecting pipes 61 to which piping extending from the outdoor unit 10 is connected. The third drain pan 43 is located below the connecting pipes 22e of the first heat exchanger 22a and the second heat exchanger 22b that protrude to the other side (the -Y side) in the second horizontal direction.

[0034] In the first embodiment, the housing 21 of the indoor unit 20 extends in a second horizontal direction Y. As shown in FIG. 2 , the dimension of the housing 21 in the second horizontal direction Y is greater than the dimension of the housing 21 in the first horizontal direction X. In the indoor unit 20 of the first embodiment, the first horizontal direction X is the short side direction, and the second horizontal direction Y is the long side direction. As shown in FIG. 3 , the housing 21 of the indoor unit 20 includes a housing main body 21a fixed to the ceiling C and a decorative panel 26 attached to the housing main body 21a. The housing main body 21a is fixed to a ceiling slab (not shown) via, for example, a hanging bolt (not shown). The housing main body 21a has a rectangular parallelepiped (hexahedron) shape. More specifically, the housing main body 21a has a substantially rectangular parallelepiped box shape that opens downward. The housing main body 21a is disposed in the attic space CA.

[0035] The decorative panel 26 is attached to the lower end of the housing main body 21a. As shown in Figures 2 and 3, the decorative panel 26 is a generally rectangular plate with its plate surface facing the vertical direction Z and its sides extending in the first horizontal direction X and the second horizontal direction Y. The decorative panel 26 is disposed indoors. The outer peripheral edge of the decorative panel 26 protrudes outward beyond the housing main body 21a when viewed in the vertical direction Z. As shown in Figure 3, the outer peripheral edge of the decorative panel 26 contacts the underside of the ceiling board W.

[0036] An air inlet 20a and an air outlet 20d that open downward are formed in the housing 21. The air inlet 20a and the air outlet 20d open on the lower surface of the housing 21 in the vertical direction Z, i.e., on the bottom surface of the housing 21. In the first embodiment, the air inlet 20a and the air outlet 20d are formed in the decorative panel 26. In the first embodiment, the air inlet 20a and the air outlet 20d open on the bottom surface of the decorative panel 26.

[0037] As shown in Fig. 2, in the first embodiment, the air inlet 20a and the air outlet 20d extend in the second horizontal direction Y. In the first embodiment, the air inlet 20a and the air outlet 20d have a generally rectangular shape that is long in the second horizontal direction Y. In the first embodiment, two air inlets 20a, a first air inlet 20b and a second air inlet 20c, are provided with an interval in the first horizontal direction X. As shown in Fig. 3, the first air inlet 20b and the second air inlet 20c are disposed below and spaced apart from the impeller 23a of the blower 23 in the vertical direction Z. A lattice-shaped grill is attached to each of the first air inlet 20b and the second air inlet 20c.

[0038] At least a portion of the first suction port 20b is disposed further away in the first horizontal direction X than the blower 23. At least a portion of the first suction port 20b is disposed in a position that does not overlap with the blower 23 when viewed in the vertical direction Z. In the first embodiment, the entire first suction port 20b is disposed in a position that does not overlap with the blower 23 when viewed in the vertical direction Z. The entire first suction port 20b is located on the other side (-X side) in the first horizontal direction than the blower 23. The first suction port 20b is located below and away from the first heat exchanger 22a. More specifically, the first suction port 20b is located below and away from a portion of the first heat exchanger 22a that is located on the other side (-X side) in the first horizontal direction than the first drain pan 41.

[0039] The second suction port 20c is located away from the first suction port 20b on one side in the first horizontal direction (+X side). In the first embodiment, the first suction port 20b and the second suction port 20c are located at the same position in the vertical direction Z. At least a portion of the second suction port 20c is located away from the blower 23 in the first horizontal direction X. At least a portion of the second suction port 20c is located at a position that does not overlap with the blower 23 as viewed in the vertical direction Z. In the first embodiment, the end of the second suction port 20c on the other side in the first horizontal direction (-X side) overlaps with the end of the blower 23 on one side in the first horizontal direction (+X side) as viewed in the vertical direction Z. The portion of the second suction port 20c excluding the end on the other side in the first horizontal direction is located on one side in the first horizontal direction (+X side) of the blower 23 as viewed in the vertical direction Z. The second suction port 20c is located away below the second heat exchanger 22b. More specifically, the second suction port 20c is located below and away from a portion of the second heat exchange section 22b that is located on one side (+X side) of the first drain pan section 41 in the first horizontal direction.

[0040] Air outlet 20d is arranged on one side (+X side) of second suction inlet 20c in the first horizontal direction with a gap therebetween. In the first embodiment, air outlet 20d is arranged at the same position as first suction inlet 20b and second suction inlet 20c in the vertical direction Z. Air outlet 20d may be arranged at a different position in the vertical direction Z from first suction inlet 20b and second suction inlet 20c.

[0041] An air passage 27 through which airflow AF generated by blower 23 flows is formed in housing 21. Air passage 27 has first suction passage 27a and second suction passage 27b through which air sucked into impeller 23a of blower 23 flows, and outlet passage 27c through which air blown out from impeller 23a of blower 23 flows. First suction passage 27a, second suction passage 27b, and outlet passage 27c are provided inside housing 21.

[0042] One end of the first suction passage 27a is the first suction port 20b and opens downward. The other end of the first suction passage 27a is connected to a lower portion of the impeller 23a of the blower 23. The first suction passage 27a extends upward from the first suction port 20b. The first heat exchanger 22a is disposed midway along the first suction passage 27a.

[0043] The second suction passage 27b is located on one side (+X side) of the first suction passage 27a in the first horizontal direction. One end of the second suction passage 27b is the second suction port 20c and opens downward. The other end of the second suction passage 27b is connected to a lower portion of the impeller 23a of the blower 23. The second suction passage 27b extends upward from the second suction port 20c. The second heat exchanger 22b is disposed midway along the second suction passage 27b.

[0044] One end of the blow-out flow path portion 27c is connected to an upper portion of the impeller 23a of the blower 23. The other end of the blow-out flow path portion 27c is the outlet 20d, which opens downward. The blow-out flow path portion 27c extends downward from the impeller 23a of the blower 23 to one side (+X side) in the first horizontal direction. The lower portion of the blow-out flow path portion 27c is located on one side of the second suction flow path portion 27b in the first horizontal direction. In the first embodiment, at least a portion of the blow-out flow path portion 27c is formed by flow path members 28a and 28b arranged in the housing main body 21a. The flow path member 28a is located above and spaced apart from the flow path member 28b. The flow path member 28b has a portion located on one side of the second heat exchanger 22b in the first horizontal direction and a portion located above the second heat exchanger 22b.

[0045] The indoor unit 20 is equipped with a dust collection filter 50. The dust collection filter 50 is a filter that allows air to pass through. The dust collection filter 50 is capable of capturing at least a portion of the dust contained in the air that passes through the dust collection filter 50. A dust collection filter 50 is provided for each of the first air inlet 20b and the second air inlet 20c.

[0046] When blower 23 is driven and impeller 23a rotates about rotation axis R, indoor air is drawn into housing 21 through first suction port 20b and second suction port 20c. Air drawn into housing 21 through first suction port 20b flows upward through first suction passage 27a, passes through dust collection filter 50 and first heat exchanger 22a in this order, and is drawn into impeller 23a of blower 23. Air drawn into housing 21 through second suction port 20c flows upward through second suction passage 27b, passes through dust collection filter 50 and second heat exchanger 22b in this order, and is drawn into impeller 23a of blower 23. Air drawn into impeller 23a through first suction passage 27a and second suction passage 27b is discharged from impeller 23a into outlet passage 27c. The air discharged into the air outlet passage 27c flows downward within the air outlet passage 27c and is blown into the room through the air outlet 20d. In this way, the air drawn into the housing 21 from the air inlet 20a of the indoor unit 20 passes through the heat exchanger 22, then passes through the blower 23, and is blown out from the air outlet 20d.

[0047] As shown in Fig. 4, the housing 21 has a first housing portion 21b and a second housing portion 21c. The first housing portion 21b extends in the second horizontal direction Y. The first housing portion 21b houses the impeller 23a and the heat exchanger body 22c. An air passage 27 is provided in the first housing portion 21b. The second housing portion 21c is disposed adjacent to the first housing portion 21b in the axial direction of the rotation axis R, i.e., in the second horizontal direction Y. The second housing portion 21c houses a connecting pipe portion 22e, which is a protruding portion of the refrigerant pipe 22g.

[0048] In the first embodiment, two second accommodating sections 21c are provided: second accommodating section 21d located on one side (+Y side) of first accommodating section 21b in the second horizontal direction, and second accommodating section 21e located on the other side (-Y side) of first accommodating section 21b in the second horizontal direction. The pair of second accommodating sections 21d, 21e are provided with first accommodating section 21b sandwiched between them in the second horizontal direction Y. A piping group 60 is accommodated inside second accommodating section 21d. A motor 23b and a control section 24 are accommodated inside second accommodating section 21e. A terminal block 24a is accommodated inside second accommodating section 21e. A power supply line that supplies power to indoor unit 20 is connected to terminal block 24a. The internal space of the pair of second accommodating sections 21d, 21e is a space outside air passage 27.

[0049] As shown in Figures 5 and 6, the indoor unit 20 includes a cover member 80 attached to one end of the heat exchanger 22 in the second horizontal direction Y. Although not shown, in Embodiment 1, the cover members 80 are attached to both ends of the heat exchanger 22 in the second horizontal direction Y. The cover members 80 are fixed to the first heat exchange section 22a and the second heat exchange section 22b. The cover members 80 hold the first heat exchange section 22a and the second heat exchange section 22b in a V-shape when viewed in the second horizontal direction Y. The two cover members 80 are arranged symmetrically with respect to each other in the second horizontal direction Y. In the following description, the cover member 80 attached to the end of the heat exchanger 22 on one side (+Y side) in the second horizontal direction will be described as a representative of the two cover members 80.

[0050] FIG. 8 is a partial cross-sectional view showing a portion of the heat exchanger 22, a cover member 80, and the refrigerant sensor device 30. As shown in FIG. 8, the cover member 80 covers the connecting pipe 22e from one side (+Y side) in the second horizontal direction. The cover member 80 has a cover main body 80a. The cover main body 80a is box-shaped and opens toward the side (-Y side) where the heat exchanger 22 is located in the second horizontal direction Y, i.e., toward the inside in the second horizontal direction. Multiple connecting pipes 22e are located inside the cover main body 80a. The cover main body 80a is attached to the first heat exchange portion 22a and the second heat exchange portion 22b. A gap is provided between the cover main body 80a and the heat exchanger main body 22c, allowing, for example, refrigerant 19 leaking from the piping group 60 to flow into the cover main body 80a through the gap.

[0051] As shown in FIGS. 5 and 6 , the cover main body 80a includes a first cover portion 81, a second cover portion 82, and a third cover portion 83. The first cover portion 81 extends upward in the second horizontal direction Y toward the other side (−X side) of the first horizontal direction. The first cover portion 81 covers the first heat exchanger 22a from the outside (+Y side) in the second horizontal direction, except for its lower end. The second cover portion 82 extends upward in the second horizontal direction Y toward the one side (+X side) of the first horizontal direction. The second cover portion 82 covers the second heat exchanger 22b from the outside in the second horizontal direction, except for its lower end. The third cover portion 83 extends in the first horizontal direction X. The third cover portion 83 connects the lower end of the first cover portion 81 to the lower end of the second cover portion 82.

[0052] The cover member 80 has mounting claws 84 that protrude inward in the second horizontal direction (-Y side) from the cover main body 80a. The mounting claws 84 are claws that hook onto the heat exchanger 22 in the second horizontal direction Y. In the first embodiment, the mounting claws 84 are hooked onto the heat exchanger main body 22c. The mounting claws 84 may also be hooked onto the connecting pipe portion 22e. The cover member 80 is attached to the heat exchanger 22 by the mounting claws 84. Although not shown in the figure, a plurality of mounting claws 84 are provided.

[0053] The cover member 80 has a sensor mounting portion 85. In the first embodiment, the sensor mounting portion 85 protrudes downward from the cover main body portion 80a. More specifically, the sensor mounting portion 85 protrudes downward from the first cover portion 81. The sensor mounting portion 85 protrudes downward from approximately the center of the first cover portion 81 in the first horizontal direction X. As shown in FIG. 8 , the sensor mounting portion 85 is a hollow portion. The interior of the sensor mounting portion 85 is connected to the interior of the cover main body portion 80a. A first hole portion 85a is formed in the sensor mounting portion 85. The first hole portion 85a penetrates, in the second horizontal direction Y, a wall portion that is located on the outer side (+Y side) in the second horizontal direction among the wall portions that constitute the sensor mounting portion 85.

[0054] As shown in FIG. 6 , the sensor mounting portion 85 is formed with a pair of guide grooves 85b and a pair of engaging protrusions 85c. The pair of guide grooves 85b open outward in the second horizontal direction (+Y side) and extend in the vertical direction Z. The pair of guide grooves 85b are arranged at a distance from each other in the first horizontal direction X. The lower ends of the pair of guide grooves 85b are connected to the first hole portion 85a. The pair of engaging protrusions 85c are formed on both sides of the inner edge of the first hole portion 85a in the first horizontal direction X. The pair of engaging protrusions 85c extend in the vertical direction Z. Each engaging protrusion 85c has a notched groove 85d formed therein that penetrates the corresponding engaging protrusion 85c in the second horizontal direction Y.

[0055] As shown in Fig. 4, the refrigerant sensor device 30 is accommodated inside the housing 21. In the first embodiment, the refrigerant sensor device 30 is provided inside each of the pair of second accommodation portions 21d, 21e. The pair of refrigerant sensor devices 30 are arranged symmetrically with respect to each other in the second horizontal direction Y. In the following description, the refrigerant sensor device 30 arranged inside the second accommodation portion 21d will be described as a representative of the pair of refrigerant sensor devices 30, and a description of the refrigerant sensor device 30 arranged inside the second accommodation portion 21e may be omitted.

[0056] FIG. 9 is a perspective view showing the refrigerant sensor device 30. As shown in FIG. 9, the refrigerant sensor device 30 has a refrigerant sensor 31 and a sensor case 32. The sensor case 32 is a member that houses the refrigerant sensor 31. The sensor case 32 is shaped like a substantially rectangular parallelepiped box. A second hole 32a is formed in the sensor case 32. In the first embodiment, the second hole 32a is formed in a wall portion that is located on the inner side (-Y side) in the second horizontal direction among the wall portions that make up the sensor case 32. The second hole 32a is a hole that connects the inside of the sensor case 32 to the outside of the sensor case 32. The refrigerant sensor 31 is disposed inside the sensor case 32 at a position that faces the second hole 32a in the second horizontal direction Y.

[0057] As shown in FIG. 8 , the second hole 32a is connected to the first hole 85a. As a result, the interior of the sensor case 32 is connected to the interior of the cover main body 80a via the second hole 32a, the first hole 85a, and the interior of the sensor mounting portion 85. The interior of the cover main body 80a is a space S provided between the cover member 80 and the heat exchanger main body 22c. The connecting pipe 22e is disposed in the space S. The space S is located between the wall portion of the cover member 80 located on the outer side (+Y side) in the second horizontal direction and the heat exchanger main body 22c in the second horizontal direction Y. The space S is connected to the interior of the sensor case 32 via the first hole 85a and the second hole 32a.

[0058] As shown in FIG. 9 , the sensor case 32 is formed with a pair of guide walls 33, 34. The pair of guide walls 33, 34 protrude inward in the second horizontal direction from the inner (-Y side) surface of the sensor case 32 in the second horizontal direction. The pair of guide walls 33, 34 are spaced apart in the first horizontal direction X. When viewed in the second horizontal direction Y, the guide walls 33 and 34 are arranged with the second hole 32a sandwiched between them in the first horizontal direction X. The guide wall 33 is located apart from the guide wall 34 on one side in the first horizontal direction (+X side). The pair of guide walls 33, 34 extend in the vertical direction Z. The pair of guide walls 33, 34 have the same shape except that they are symmetrical with respect to the first horizontal direction X. In the following description, the guide wall 33 will be described as a representative of the pair of guide walls 33, 34, and a description of the guide wall 34 may be omitted.

[0059] The guide wall portion 33 has a wall main body portion 33a that protrudes inward in the second horizontal direction (-Y side) from the sensor case 32, and an engaging claw portion 33b and a protrusion portion 33c that protrude from the wall main body portion 33a to one side in the first horizontal direction (+X side). The engaging claw portion 33b is hooked from the inside in the second horizontal direction (-Y side) on an engaging protrusion 85c provided on the sensor mounting portion 85. This prevents the sensor case 32 from coming off the cover member 80 in the second horizontal direction Y. The protrusion portion 33c fits into a notched groove 85d formed in the engaging protrusion 85c. This prevents the sensor case 32 from moving in the vertical direction Z relative to the cover member 80.

[0060] An operator attaching the refrigerant sensor device 30 to the cover member 80 inserts the pair of guide walls 33, 34 into the pair of guide grooves 85b from the outer side (+Y side) in the second horizontal direction and slides the refrigerant sensor device 30 downward. This allows the engaging claws 33b on each of the pair of guide walls 33, 34 to hook onto the pair of engaging protrusions 85c from the inner side (-Y side) in the second horizontal direction, and the protrusions 33c on each of the pair of guide walls 33, 34 to fit into the notched grooves 85d formed in the pair of engaging protrusions 85c. This attaches the sensor case 32 to the cover member 80. In the first embodiment, the refrigerant sensor 31 is attached to the cover member 80 via the sensor case 32.

[0061] The refrigerant sensor 31 is a sensor capable of detecting the refrigerant 19. The refrigerant sensor 31 is, for example, an oxygen concentration type refrigerant sensor or a combustible gas detection type refrigerant sensor. The refrigerant sensor 31 is, for example, a semiconductor type refrigerant sensor. As shown in FIG. 3 , the refrigerant sensor 31 is housed inside the housing 21. The refrigerant sensor 31 is located above the suction port 20a and below the upper end of the heat exchanger 22, i.e., the upper end of the first heat exchange section 22a. In the first embodiment, the refrigerant sensor 31 is located below the upper end of the second heat exchange section 22b.

[0062] In the first embodiment, the refrigerant sensor 31 is located above the lower end of the heat exchanger 22. The lower end of the heat exchanger 22 is the lowest part of the heat exchanger 22. The lower end of the heat exchanger 22 includes the lower end of the first heat exchange section 22a and the lower end of the second heat exchange section 22b. The refrigerant sensor 31 is located between the first heat exchange section 22a and the first air inlet 20b in the vertical direction Z, as viewed in the second horizontal direction Y. The refrigerant sensor 31 is located below the rotation axis R of the blower 23. The refrigerant sensor 31 is located on the other side (-X side) of the impeller 23a in the first horizontal direction. The refrigerant sensor 31 is located at the same position in the vertical direction Z as a part of the lower portion of the impeller 23a. In the first embodiment, the refrigerant sensor 31 is located above the drain pan 40. The refrigerant sensor 31 is located on the other side of the first drain pan section 41 in the first horizontal direction.

[0063] Figure 10 is a cross-sectional view showing a portion of the indoor unit 20, taken along the line X-X in Figure 4. As shown in Figure 10, the refrigerant sensor 31 is disposed above the second drain pan 42 with a gap therebetween. In Embodiment 1, the refrigerant sensor 31 is disposed in a position overlapping the drain pan 40 when viewed in the vertical direction Z. More specifically, the refrigerant sensor 31 is disposed in a position overlapping a portion of the second drain pan 42 that protrudes further to the other side (-X side) in the first horizontal direction than the first drain pan 41 when viewed in the vertical direction Z.

[0064] As described above, in the first embodiment, the refrigerant sensor device 30 is provided inside each of the pair of second housing portions 21d, 21e. Therefore, as shown in Fig. 4, the refrigerant sensor 31 is provided inside each of the pair of second housing portions 21d, 21e. The internal space of each of the pair of second housing portions 21d, 21e is a space outside of the air passage 27. In other words, in the first embodiment, the refrigerant sensor 31 is located outside of the air passage 27.

[0065] Refrigerant 19 leaking into housing 21 flows into sensor case 32 through second hole 32a and comes into contact with refrigerant sensor 31, causing refrigerant sensor 31 to detect refrigerant 19. When refrigerant sensor 31 detects refrigerant 19, a detection signal indicating that refrigerant 19 has been detected is sent from refrigerant sensor 31 to control unit 24. When control unit 24 receives the detection signal from refrigerant sensor 31, it executes a predetermined first operation. In other words, when refrigerant sensor 31 detects refrigerant 19, control unit 24 executes the predetermined first operation.

[0066] In the first embodiment, the predetermined first operation executed by the control unit 24 includes issuing an alert that the refrigerant 19 has leaked, driving the blower 23 at a predetermined output, sending an operation stop command to the outdoor unit 10, and closing the flow control valve 14. In the first embodiment, when the refrigerant sensor 31 detects the refrigerant 19, the control unit 24 drives the blower 23 at maximum output. In the first embodiment, when the refrigerant sensor 31 detects the refrigerant 19, the control unit 24 sends a signal to the notification unit 25, causing the notification unit 25 to notify the outside of the indoor unit 20 that the refrigerant 19 has leaked. The notification unit 25 may, for example, notify the refrigerant 19 leak by light, by sound such as a warning sound, or by light and sound. The notification unit 25 may have a display unit and notify the refrigerant 19 leak by displaying a warning message on the display unit. The notification unit 25 may be housed inside the housing 21 or may be attached to the outer surface of the housing 21 .

[0067] If the refrigerant sensor 31 detects refrigerant 19 while the air conditioner 100 is operating, the control unit 24 issues a warning that refrigerant 19 has leaked, drives the blower 23 at a predetermined output, sends an operation stop command to the outdoor unit 10, and closes the flow rate adjustment valve 14. In this case, the control unit 24 changes the output of the blower 23, which had been rotating, to the predetermined output.

[0068] If the refrigerant sensor 31 detects the refrigerant 19 while the air conditioner 100 is stopped, the control unit 24 issues a warning that the refrigerant 19 has leaked, drives the blower 23 at a predetermined output, and closes the flow rate adjustment valve 14. In this case, the control unit 24 drives the blower 23, which has been stopped, at the predetermined output.

[0069] Fig. 11 is a perspective view showing a part of the indoor unit 20, viewed from a different angle than Fig. 7. As shown in Fig. 11, the indoor unit 20 includes a partition member 70 that separates the interior of the first storage section 21b from the interior of the second storage section 21d. In the first embodiment, the partition member 70 closes at least a portion of the gap between the heat exchanger body 22c and the drain pan 40. In the first embodiment, two partition members 70 are provided: a first partition member 71 and a second partition member 72.

[0070] 10 , the first partition member 71 closes almost the entire gap G1 in the vertical direction Z between the heat exchanger body 22c of the first heat exchange unit 22a and the second drain pan 42. The gap G1 is a substantially triangular gap when viewed in the second horizontal direction Y. The gap G1 is a gap surrounded by the heat exchanger body 22c of the first heat exchange unit 22a, the second drain pan 42, and the wall 21f of the housing body 21a located on the other side (−X side) in the first horizontal direction.

[0071] FIG. 12 is a perspective view showing the first partition member 71. As shown in FIG. 12, the first partition member 71 has a partition main body 71a that closes the gap G1 and multiple mounting portions 71b. The partition main body 71a is a triangular plate-like member when viewed in the second horizontal direction Y. The upper edge of the partition main body 71a extends at an angle in the vertical direction Z with respect to the first horizontal direction X. The upper edge of the partition main body 71a is positioned downward as it moves toward one side (+X side) in the first horizontal direction. As shown in FIG. 10, the partition main body 71a is positioned on the inner side (-Y side) of the sensor mounting portion 85 in the second horizontal direction.

[0072] The multiple mounting portions 71b are provided on the upper edge of the partition wall main body 71a. As shown in Fig. 12, the multiple mounting portions 71b are generally U-shaped and open upward when viewed in the second horizontal direction Y. The multiple mounting portions 71b are arranged at intervals along the upper edge of the partition wall main body 71a. As shown in Fig. 10, each mounting portion 71b is attached to a connecting pipe portion 22e of the first heat exchanger 22a. In this way, the first partition wall member 71 is attached to the first heat exchanger 22a.

[0073] The second partition member 72 closes almost the entire gap G2 in the vertical direction Z between the heat exchanger body 22c of the second heat exchange section 22b and the second drain pan section 42. The gap G2 is a substantially triangular gap when viewed in the second horizontal direction Y. The gap G2 is a gap surrounded by the heat exchanger body 22c of the second heat exchange section 22b, the second drain pan section 42, and the flow path member 28b.

[0074] The second partition member 72 has a partition main body 72a that closes the gap G2 and multiple mounting portions 72b. The partition main body 72a is a triangular plate-like member when viewed in the second horizontal direction Y. The upper edge of the partition main body 72a extends at an angle in the vertical direction Z with respect to the first horizontal direction X. The upper edge of the partition main body 72a is positioned downward as it extends toward the other side (-X side) in the first horizontal direction. The multiple mounting portions 72b are provided on the upper edge of the partition main body 72a. Although not shown, the multiple mounting portions 72b have a generally U-shape that opens upward when viewed in the second horizontal direction Y. The multiple mounting portions 72b are arranged at intervals along the upper edge of the partition main body 72a. Each mounting portion 72b is attached to a connecting pipe portion 22e of the second heat exchanger 22b. As a result, the second partition member 72 is attached to the second heat exchange section 22b.

[0075] Although not shown, the indoor unit 20 also includes a partition member that separates the interior of the first storage section 21 b from the interior of the second storage section 21 e. The partition member has the same configuration as the partition member 70 described above, except that it is symmetrical in the second horizontal direction Y.

[0076] According to the first embodiment, the indoor unit 20 includes a housing 21 having an intake port 20a and an exhaust port 20d that open downward, a heat exchanger 22 housed within the housing 21, a blower 23 housed within the housing 21 and generating an airflow AF that passes through the heat exchanger 22, and a refrigerant sensor 31 housed within the housing 21 and capable of detecting refrigerant 19. Air drawn into the housing 21 through the intake port 20a by the operation of the blower 23 passes through the heat exchanger 22, then passes through the blower 23 and is blown out through the exhaust port 20d. The refrigerant sensor 31 is located above the intake port 20a and below the upper end of the heat exchanger 22. The gaseous refrigerant 19 that leaks from the refrigerant circuit 18 flows downward because its density is greater than that of air. Thus, by positioning the refrigerant sensor 31 below the upper end of the heat exchanger 22, the refrigerant sensor 31 can more easily detect the leaking refrigerant 19 that flows downward. Therefore, the refrigerant 19 leaking into the indoor unit 20 attached to the ceiling C can be suitably detected.

[0077] According to the first embodiment, the housing 21 is provided with an air passage 27 through which the airflow AF flows. The refrigerant sensor 31 is located outside the air passage 27. Refrigerant 19 is likely to leak from the portion of the refrigerant piping 22g of the heat exchanger 22 that is located outside the air passage 27, i.e., the connecting pipe 22e and the piping group 60 located outside the air passage 27. Therefore, by locating the refrigerant sensor 31 outside the air passage 27, it is easy to place the refrigerant sensor 31 in a location where refrigerant 19 is likely to leak. This makes it easier for the refrigerant sensor 31 to quickly and effectively detect the leaked refrigerant 19 in the event of a leak. Furthermore, because the leaked refrigerant 19 is less likely to mix with the airflow AF generated within the housing 21, the leaked refrigerant 19 is less likely to diffuse inside the housing 21, and the concentration of the leaked refrigerant 19 is less likely to become diluted. This makes it easier for the refrigerant sensor 31 to effectively detect the leaked refrigerant 19.

[0078] According to the first embodiment, the blower 23 includes an impeller 23a that rotates about a rotation axis R extending in the second horizontal direction Y. The heat exchanger 22 includes a heat exchanger body 22c and a refrigerant pipe 22g fixed to the heat exchanger body 22c. The housing 21 includes a first housing portion 21b that houses the impeller 23a and the heat exchanger body 22c and that is provided with an air passage 27, and a second housing portion 21c that is adjacent to the first housing portion 21b in the axial direction of the rotation axis R, i.e., the second horizontal direction Y, and that houses a connecting pipe portion 22e of the refrigerant pipe 22g that protrudes in the second horizontal direction Y beyond the heat exchanger body 22c. The refrigerant sensor 31 is provided inside the second housing portion 21c. This facilitates convenient placement of the refrigerant sensor 31 outside the air passage 27. Furthermore, the refrigerant sensor 31 can easily and suitably detect the refrigerant 19 leaking from the connecting pipe portion 22e.

[0079] Furthermore, according to the first embodiment, the indoor unit 20 includes a partition member 70 that separates the interior of the first storage portion 21b from the interior of the second storage portion 21c. This prevents refrigerant 19 that leaks inside the second storage portion 21c, which is outside the air passage 27, from flowing into the first storage portion 21b in which the air passage 27 is provided. This prevents the leaked refrigerant 19 from flowing into the indoor space via the intake port 20a and the exhaust port 20d. This prevents the concentration of the leaked refrigerant 19 from becoming low inside the second storage portion 21c, making it easier for the refrigerant sensor 31 to detect the leaked refrigerant 19.

[0080] Furthermore, according to the first embodiment, the partition member 70 closes at least a portion of the gaps G1, G2 between the heat exchanger body 22c and the drain pan 40 located below the heat exchanger body 22c. Therefore, the gaps G1, G2 provided below the heat exchanger body 22c can be suitably closed by the partition member 70. This more suitably prevents the leaked refrigerant 19 from flowing downward due to its own weight into the first storage portion 21b.

[0081] Furthermore, according to the first embodiment, the indoor unit 20 includes a cover member 80 attached to one end of the heat exchanger 22 in the second horizontal direction Y. The refrigerant sensor 31 is attached to the cover member 80. This makes it easy to position the refrigerant sensor 31 outside the air passage 27 easily and conveniently. The refrigerant sensor 31 can also be positioned conveniently near the connecting pipe 22e of the heat exchanger 22. This allows the refrigerant sensor 31 to more efficiently detect refrigerant 19 leaking from the connecting pipe 22e.

[0082] Furthermore, according to the first embodiment, the indoor unit 20 includes a sensor case 32 that houses a refrigerant sensor 31. A cover member 80 covers the connecting pipe 22e. A first hole 85a is formed in the cover member 80. A second hole 32a is formed in the sensor case 32. A space S defined between the cover member 80 and the heat exchanger body 22c is connected to the interior of the sensor case 32 via the first hole 85a and the second hole 32a. Therefore, the cover member 80 can prevent the refrigerant 19 leaking from the connecting pipe 22e from diffusing. Furthermore, the refrigerant 19 leaking from the connecting pipe 22e into the space S can flow from the space S into the sensor case 32 via the first hole 85a and the second hole 32a. This allows the refrigerant sensor 31 in the sensor case 32 to detect the leaked refrigerant 19 effectively.

[0083] Furthermore, according to the first embodiment, a pair of second storage sections 21c are provided, sandwiching the first storage section 21b in the second horizontal direction Y. Refrigerant sensors 31 are provided inside each of the pair of second storage sections 21d, 21e. Therefore, refrigerant 19 leaking from each of the second storage sections 21d, 21e can be quickly and effectively detected by the refrigerant sensors 31 arranged inside each of the second storage sections 21d, 21e. In particular, when the indoor unit 20 has a relatively large dimension in the second horizontal direction Y, refrigerant 19 leaking from one of the second storage sections 21d, 21e is unlikely to flow to the other of the second storage sections 21d, 21e. By providing the refrigerant sensors 31 in each of the pair of second storage sections 21d, 21e, leaked refrigerant 19 can be quickly and effectively detected regardless of whether the refrigerant 19 leaks from either of the pair of second storage sections 21d, 21e.

[0084] Furthermore, according to the first embodiment, the refrigerant sensor 31 is positioned above the lower end of the heat exchanger 22. This prevents the refrigerant sensor 31 from being positioned too low in the vertical direction Z within the housing 21. This shortens the time it takes for the refrigerant 19 flowing downward after a leak to reach the refrigerant sensor 31. This makes it easier to detect the leakage of refrigerant 19 more quickly. This also prevents the refrigerant sensor 31 from being too close to the drain pan 40, preventing the refrigerant sensor 31 from coming into contact with condensation accumulated in the drain pan 40. Furthermore, the refrigerant sensor 31 can be positioned at a suitable distance above the suction port 20a, which is positioned below the heat exchanger 22. This allows the refrigerant sensor 31 to detect the leaked refrigerant 19 before it reaches or near the suction port 20a, effectively preventing the refrigerant 19 from leaking into the room.

[0085] Furthermore, according to the first embodiment, the indoor unit 20 includes a drain pan 40 located below the heat exchanger 22. The refrigerant sensor 31 is located above the drain pan 40. This further reduces the refrigerant sensor 31 from coming into contact with condensed water that has accumulated in the drain pan 40.

[0086] The above-described arrangement of the refrigerant sensor 31 is an arrangement of the refrigerant sensor 31 suitable for suitably detecting leaked refrigerant 19 in an indoor unit 20 that is mounted on the ceiling C and generates an airflow AF in which air drawn into the housing 21 from the air inlet 20a passes through the heat exchanger 22 before being drawn into the blower 23. Even in an indoor unit that is mounted on the ceiling C, for example, in an indoor unit in which a heat exchanger surrounds a blower having an impeller that rotates about an axis extending in the vertical direction Z, and in which air drawn into the housing from the air inlet passes through the heat exchanger after being drawn into the blower, the structure of the indoor unit itself differs from that of the indoor unit 20 of the first embodiment, and therefore an arrangement relationship different from the arrangement of the refrigerant sensor 31 described above must be adopted.

[0087] Furthermore, according to the first embodiment, the indoor unit 20 includes a control unit 24. The control unit 24 executes a predetermined first operation when the refrigerant sensor 31 detects the refrigerant 19. The predetermined first operation performed by the control unit 24 includes notifying the user that the refrigerant 19 has leaked. This allows the user or the like to be notified promptly and appropriately of the refrigerant 19 leak. The predetermined first operation performed by the control unit 24 also includes driving the blower 23 at a predetermined output. This allows the air blown into the room by the blower 23 to diffuse the leaked refrigerant 19 in the indoor space, even if the refrigerant 19 leaks into the room. This prevents the refrigerant 19 from accumulating in the room. In the first embodiment, the control unit 24 drives the blower 23 at maximum output when the refrigerant sensor 31 detects the refrigerant 19, thereby more effectively preventing the refrigerant 19 from accumulating in the room. Furthermore, the predetermined first operation performed by the control unit 24 includes sending an operation stop command to the outdoor unit 10 of the air conditioner 100. Therefore, the outdoor unit 10 is stopped, and it is possible to prevent the refrigerant 19 from being sent from the outdoor unit 10 to the indoor unit 20. This makes it possible to further prevent the refrigerant 19 from leaking from the indoor unit 20. Furthermore, the predetermined first operation performed by the control unit 24 includes closing the flow control valve 14, which is a valve provided in the refrigerant circuit unit 18 that connects the outdoor unit 10 and the indoor unit 20. Therefore, it is possible to more effectively prevent the refrigerant 19 from being sent from the outdoor unit 10 to the indoor unit 20. This makes it possible to more effectively prevent the refrigerant 19 from leaking from the indoor unit 20.

[0088] Embodiment 2. Figure 13 is a cross-sectional view showing an indoor unit 220 in embodiment 2. Figure 14 is a cross-sectional view showing the indoor unit 220 in embodiment 2, taken along the line XIV-XIV in Figure 13. In the following explanation, the same components as those in the above-mentioned embodiments will be denoted by the same reference numerals as appropriate, and explanations thereof may be omitted.

[0089] As shown in Fig. 13 , the dimension in the second horizontal direction Y of the indoor unit 220 in Embodiment 2 is smaller than the dimension in the second horizontal direction Y of the indoor unit 20 in Embodiment 1. Specifically, in the indoor unit 220, the dimension in the second horizontal direction Y of the first accommodation section 21b and the components accommodated therein are smaller than the dimensions in the second horizontal direction Y of the first accommodation section 21b and the components accommodated therein in Embodiment 1, respectively. The dimension in the second horizontal direction Y of the indoor unit 220 is, for example, larger than the dimension in the first horizontal direction X of the indoor unit 220 and is no more than three times the dimension in the first horizontal direction X of the indoor unit 220. Note that the dimension in the second horizontal direction Y of the indoor unit 220 may, for example, be larger than the dimension in the first horizontal direction X of the indoor unit 220 and no more than twice the dimension in the first horizontal direction X of the indoor unit 220. The dimension of the indoor unit 220 in the second horizontal direction Y may be the same as the dimension of the indoor unit 220 in the first horizontal direction X, or may be smaller than the dimension of the indoor unit 220 in the first horizontal direction X, for example.

[0090] In the second embodiment, refrigerant sensor device 230 having refrigerant sensor 231 is provided only in second housing portion 21d, which is located on one side (+Y side) of paired second housing portions 21c in the second horizontal direction. In other words, refrigerant sensor 231 is not provided in second housing portion 21e, which is located on the other side (-Y side) of paired second housing portions 21c in the second horizontal direction.

[0091] As shown in Figure 14, in the second embodiment, the refrigerant sensor 231 is located on one side in the first horizontal direction (+X side) of the first drain pan portion 41 of the drain pan 40. The refrigerant sensor 231 is located on one side in the first horizontal direction of the impeller 23a. When viewed in the second horizontal direction Y, the refrigerant sensor 231 is disposed between the second heat exchanger 22b and the second air inlet 20c in the vertical direction Z. The refrigerant sensor 231 is located below the center of the second heat exchanger 22b in the first horizontal direction X. The refrigerant sensor 231 is located below the blower 23.

[0092] The refrigerant sensor 231 is located above the drain pan 40. The refrigerant sensor 231 is positioned closer to the drain pan 40 than the impeller 23a of the blower 23. The refrigerant sensor 231 is located below the center in the vertical direction Z between the lower end of the impeller 23a and the drain pan 40. The refrigerant sensor 231 is located near the drain pan 40. The distance in the vertical direction Z between the upper end of the drain pan 40 and the refrigerant sensor 231 is equal to or less than the dimension in the vertical direction Z of the side wall portions 41b, 41c of the first drain pan portion 41. The upper end of the drain pan 40 includes the upper ends of the side wall portions 41b, 41c. The distance in the vertical direction Z between the upper end of the drain pan 40 and the refrigerant sensor 231 is small enough to allow the refrigerant sensor 231 to easily detect refrigerant 19 when, for example, leaking gaseous refrigerant 19 overflows from the drain pan 40 and accumulates above the drain pan 40, or when the leaking gaseous refrigerant 19 rises above the drain pan 40 due to a flow of the refrigerant 19. On the other hand, the distance in the vertical direction Z between the upper end of the drain pan 40 and the refrigerant sensor 231 is large enough to prevent condensation water accumulated in the drain pan 40 from overflowing from the drain pan 40 from contacting the refrigerant sensor 231. The other positional relationship and configuration of the refrigerant sensor 231 are the same as those of the refrigerant sensor 31 in the first embodiment.

[0093] Unlike the indoor unit 20 in the first embodiment, the indoor unit 220 is not provided with a partition member 70. The other configurations of the indoor unit 220 are the same as the other configurations of the indoor unit 20 in the first embodiment.

[0094] In the second embodiment, as in the first embodiment, leaked refrigerant 19 can be suitably detected by the refrigerant sensor 231. Because the dimension in the second horizontal direction Y of the indoor unit 220 in the second embodiment is smaller than the dimension in the second horizontal direction Y of the indoor unit 20 in the first embodiment, leaked refrigerant 19 in one second storage portion 21c easily flows into the other second storage portion 21c. In particular, because the partition member 70 is not provided in the second embodiment, the refrigerant 19 easily flows between the pair of second storage portions 21c via the first storage portion 21b. As a result, even if refrigerant 19 leaks in either of the pair of second storage portions 21c, the leaked refrigerant 19 can be easily detected by the refrigerant sensor 231 arranged only in one of the second storage portions 21c.

[0095] Furthermore, according to the second embodiment, the refrigerant sensor 231 is located below the blower 23. This makes it easier to position the refrigerant sensor 231 in the vertical direction Z close to the drain pan 40. This makes it easier for the refrigerant sensor 231 to detect refrigerant 19 that has leaked and accumulated in the drain pan 40.

[0096] Embodiment 3. Figure 15 is a cross-sectional view showing an indoor unit 320 in embodiment 3. In the following description, the same components as those in the above-described embodiments will be denoted by the same reference numerals as appropriate, and the description may be omitted.

[0097] 15 , the indoor unit 320 of the third embodiment includes a refrigerant sensor device 230 and a refrigerant sensor device 330. Each refrigerant sensor device 230, 330 is provided in the second storage section 21d. In the third embodiment, two refrigerant sensors 231, 331 are provided in the second storage section 21d. The refrigerant sensor 231 and the refrigerant sensor 331 are arranged at an interval in the first horizontal direction X.

[0098] The refrigerant sensor 331 is located on the other side (-X side) in the first horizontal direction of the first drain pan portion 41 of the drain pan 40. The refrigerant sensor 331 is located on the other side in the first horizontal direction of the impeller 23a. The refrigerant sensor 331 is located in the same position as the refrigerant sensor 231 in the vertical direction Z. The refrigerant sensor 331 is disposed in a position between the first heat exchange portion 22a and the first suction port 20b in the vertical direction Z when viewed in the second horizontal direction Y. The other positional relationships and configuration of the refrigerant sensor 331 are the same as those of the refrigerant sensor 31 in the first embodiment. The other configuration of the indoor unit 320 is the same as that of the indoor unit 20 in the first embodiment.

[0099] According to the third embodiment, multiple refrigerant sensors 231, 331 are provided inside the second storage portion 21 d. Therefore, leakage of the refrigerant 19 inside the second storage portion 21 d can be detected more quickly and more effectively. Furthermore, according to the third embodiment, even if the indoor unit 320 is increased in size in the first horizontal direction X, leakage of the refrigerant 19 can be detected effectively by the multiple refrigerant sensors 231, 331 arranged at intervals in the first horizontal direction X.

[0100] In addition, two refrigerant sensors 231, 331 may be provided in the other second storage section 21e, as in the second storage section 21d, or no refrigerant sensors 231, 331 may be provided.

[0101] Embodiment 4. Figure 16 is a perspective view showing an indoor unit 420 in embodiment 4. Figure 17 is a cross-sectional view showing an indoor unit 420 in embodiment 4. In the following description, the same components as those in the above-described embodiments will be denoted by the same reference numerals as appropriate, and description thereof may be omitted.

[0102] As shown in Figures 16 and 17, the housing 421 of the indoor unit 420 is formed with three air inlets 420a that open downward and two air outlets 420b that open downward. The three air inlets 420a and two air outlets 420b are formed on the underside of the decorative panel 426. The three air inlets 420a and two air outlets 420b extend in the second horizontal direction Y. The three air inlets 420a are arranged side by side at intervals in the first horizontal direction X. The dimension in the first horizontal direction X of the air inlet 420a that is located at the center of the three air inlets 420a in the first horizontal direction X is larger than the dimensions in the first horizontal direction X of the other two air inlets 420a. The two air outlets 420b are arranged on either side of the three air inlets 420a in the first horizontal direction X.

[0103] 17 , the indoor unit 420 includes two heat exchangers 422a and 422b, two fans 423a and 423b, and two drain pans 440a and 440b. Two air passages 427a and 427b are formed in the housing 421. The configurations of the heat exchanger 422b, the fans 423b, the drain pan 440b, and the air passage 427b are the same as the configurations of the respective parts in the indoor unit 20 of Embodiment 1. The heat exchanger 422a, the fans 423a, the drain pan 440a, and the air passage 427a are arranged symmetrically in the first horizontal direction X with respect to the heat exchanger 422b, the fans 423b, the drain pan 440b, and the air passage 427b, with the center of the indoor unit 420 in the first horizontal direction X being sandwiched between them.

[0104] In the fourth embodiment, a portion of the air drawn into the housing 421 through the air inlet 420a located at the center in the first horizontal direction X flows through the air passage 427a, passes through the first heat exchange unit 22a of the heat exchanger 422a, is drawn into the fan 423a, and is blown out into the room through the air outlet 420b located on the other side (-X side) in the first horizontal direction. The rest of the air drawn into the housing 421 through the air inlet 420a located at the center in the first horizontal direction X flows through the air passage 427b, passes through the first heat exchange unit 22a of the heat exchanger 422b, is drawn into the fan 423b, and is blown out into the room through the air outlet 420b located on one side (+X side) in the first horizontal direction.

[0105] Air sucked into the housing 421 through the intake port 420a located on the other side of the first horizontal direction (-X side) flows through the air passage 427a, passes through the second heat exchange section 22b of the heat exchanger 422a, is sucked into the blower 423a, and is blown out into the room from the exhaust port 420b located on the other side of the first horizontal direction.

[0106] Air sucked into the housing 421 through the intake port 420a located on one side of the first horizontal direction (+X side) flows through the air passage 427b, passes through the second heat exchange section 22b of the heat exchanger 422b, is then sucked into the blower 423b, and is blown out into the room through the exhaust port 420b located on one side of the first horizontal direction.

[0107] In the fourth embodiment, two refrigerant sensors 431a, 431b are provided in each of the pair of second storage sections 21c. The two refrigerant sensors 431a, 431b are arranged in each second storage section 21c with a gap in the first horizontal direction X. When viewed in the second horizontal direction Y, the refrigerant sensor 431a is arranged between the suction port 420a, which is located at the center of the first horizontal direction X, and the first heat exchange section 22a of the heat exchanger 422a. When viewed in the second horizontal direction Y, the refrigerant sensor 431b is arranged between the suction port 420a, which is located at the center of the first horizontal direction X, and the first heat exchange section 22a of the heat exchanger 422b, in the vertical direction Z. The refrigerant sensors 431a, 431b are located below the fans 423a, 423b and above the drain pans 440a, 440b. Other configurations of the indoor unit 420 are similar to other configurations of the indoor unit 20 in the first embodiment.

[0108] In the fourth embodiment, similarly to the third embodiment, leaking refrigerant 19 can be suitably detected by the plurality of refrigerant sensors 431a, 431b.

[0109] Embodiment 5. Fig. 18 is a schematic diagram showing an air conditioner 500 according to embodiment 5. In the following description, the same components as those in the above-described embodiments may be denoted by the same reference numerals as appropriate, and the description thereof may be omitted.

[0110] As shown in Figure 18, the air conditioner 500 in embodiment 5 is a multi-type air conditioner provided with a plurality of indoor units 20. In the example of Figure 18, four indoor units 20 are provided. Two indoor units 20 are attached to the ceiling of room RM1. The remaining two indoor units 20 are attached to the ceiling of room RM2, which is different from room RM1. The multiple indoor units 20 are connected to one outdoor unit 10 via a refrigerant distributor 590.

[0111] In embodiment 5, when the control unit 24 of each indoor unit 20 detects refrigerant 19 based on the refrigerant sensor 31, it performs the first operation described in embodiment 1 and sends a signal to the control unit 24 of at least one other indoor unit 20 to cause it to perform a predetermined second operation. In embodiment 5, the control unit 24 sends signals to the control units 24 of all remaining indoor units 20 to cause them to perform the second operation. The second operation may include one or more of the contents included in the first operation described in embodiment 1, or may include contents not included in the first operation. When a signal to cause two or more control units 24 to perform the second operation is sent from one control unit 24, the contents of the second operation performed in the two or more control units 24 may be different for each control unit 24, or may be the same for each control unit 24.

[0112] Specifically, when the control unit 24 of one indoor unit 20 installed in room RM1 detects a leak of refrigerant 19 based on the refrigerant sensor 31, the control unit 24 sends a signal to execute a second operation to the control unit 24 of the other indoor unit 20 installed in room RM1 and the control units 24 of the two indoor units 20 installed in another room RM2. As the second operation, the control unit 24 of the other indoor unit 20 installed in room RM1 executes driving the blower 23 at a predetermined output. This allows air to be sent into room RM1 from the blowers 23 of the two indoor units 20, and makes it possible to suitably prevent refrigerant 19 from accumulating in room RM1.

[0113] The control units 24 of the two indoor units 20 installed in the other room RM2 execute a second operation of notifying that the refrigerant 19 has leaked from the indoor unit 20 installed in room RM1. This makes it possible to notify users in room RM2 that the refrigerant 19 has leaked from the indoor unit 20 in room RM1.

[0114] As described above, according to the fifth embodiment, a plurality of indoor units 20 are provided, and when the control unit 24 detects refrigerant 19 based on the refrigerant sensor 31, it sends a signal to the control unit 24 of at least one other indoor unit 20 to execute a predetermined second operation. This makes it possible to drive the fans 23 of all indoor units 20 installed in the same room at maximum output to prevent refrigerant 19 from accumulating in that room, and to notify users, etc., of a refrigerant 19 leak in another room, quickly informing them of the refrigerant 19 leak.

[0115] 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, and the following configurations and methods may also be adopted.

[0116] The number of refrigerant sensors is not particularly limited as long as it is one or more. The refrigerant sensor may be located anywhere within the housing, as long as it is located above the air inlet and below the upper end of the heat exchanger. The refrigerant sensor may be any type of sensor that can detect refrigerant. The refrigerant sensor may be located in an air passage formed within the housing. The refrigerant sensor may be attached to any component within the housing. The refrigerant sensor may be attached to the housing. The refrigerant sensor may be attached to the drain pan. The refrigerant sensor may be located in a position that does not overlap with the drain pan when viewed vertically. In this case, the refrigerant sensor can be effectively prevented from coming into contact with condensation water accumulated in the drain pan.

[0117] The sensor case that houses the refrigerant sensor may have multiple holes that connect the inside and outside of the sensor case. For example, in the first embodiment described above, the sensor case 32 may have a third hole different from the second hole 32a. The third hole may open to a space inside the second housing portion 21d and outside the cover main body portion 80a. In this case, refrigerant 19 leaking from the pipe group 60 housed in the second housing portion 21d can easily enter the sensor case 32 through the third hole. This makes it easier for the refrigerant sensor 31 to detect refrigerant 19 leaking from the pipe group 60.

[0118] The predetermined first action that the control unit of the indoor unit executes when the refrigerant sensor detects a refrigerant may include at least one of: notifying the refrigerant leak, driving the blower at a predetermined output, sending an operation stop command to the outdoor unit of the air conditioner, and closing a valve provided in the refrigerant circuit connecting the outdoor unit and the indoor unit. The control unit of the indoor unit does not have to execute the first action. For example, when the refrigerant sensor detects a refrigerant, a signal may be sent to another control unit provided outside the indoor unit, and the other control unit may execute the first action. The other control unit may be, for example, the control unit of the outdoor unit.

[0119] The configurations and methods described in this specification can be combined as appropriate within the scope of not contradicting each other.

[0120] DESCRIPTION OF SYMBOLS 10... Outdoor unit, 18... Refrigerant circuit section, 19... Refrigerant, 20, 220, 320, 420... Indoor unit, 20a, 420a... Intake port, 20b... First intake port (intake port), 20c... Second intake port (intake port), 20d, 420b... Outlet port, 21, 421... Housing, 21b... First storage section, 21c, 21d, 21e... Second storage section, 22, 422a, 422b... Heat exchanger, 22c... Heat exchanger body, 22e... Connection pipe section (protruding portion), 22g ...refrigerant piping, 23, 423a, 423b...blower, 23a...impeller, 24...controller, 27, 427a, 427b...air path, 31, 231, 331, 431a, 431b...refrigerant sensor, 32...sensor case, 32a...second hole, 40, 440a, 440b...drain pan, 70...partition member, 80...cover member, 85a...first hole, 100, 500...air conditioner, AF...air flow, C...ceiling, R...rotation axis, S...space

Claims

1. An indoor unit of an air conditioner that is attached to a ceiling, a housing having an intake port and an exhaust port that open downward; a heat exchanger housed inside the housing; a blower housed within the housing and generating an airflow that passes through the heat exchanger; a refrigerant sensor housed inside the housing and capable of detecting a refrigerant; a sensor case that houses the refrigerant sensor; A cover member; Equipped with The air drawn into the housing through the air inlet by the driving of the air blower passes through the heat exchanger, then passes through the air blower, and is blown out through the air outlet, An air passage through which the air flows is formed in the housing, The blower has an impeller that rotates around a rotation axis that extends horizontally, The heat exchanger comprises: A heat exchanger body; a refrigerant pipe fixed to the heat exchanger body; and The housing includes: a first housing portion in which the impeller and the heat exchanger body are housed and in which the air passage is provided; a second accommodating portion that is disposed adjacent to the first accommodating portion in the axial direction of the rotation axis and that accommodates a protruding portion of the refrigerant pipe that protrudes beyond the heat exchanger body in the axial direction; and the internal space of the second accommodating portion is a space outside the air passage, the refrigerant sensor is provided inside the second accommodating portion, positioned above the suction port and below an upper end of the heat exchanger, and attached to the cover member; the cover member is attached to one end of the heat exchanger in the axial direction and covers the protruding portion; The cover member has a first hole formed therein, The sensor case has a second hole formed therein, a space provided between the cover member and the heat exchanger body connected to the inside of the sensor case via the first hole and the second hole.

2. The indoor unit according to claim 1 , further comprising a partition member that separates an interior of the first storage portion from an interior of the second storage portion.

3. The indoor unit according to claim 2 , wherein the partition member closes at least a part of a gap between the heat exchanger body and a drain pan located below the heat exchanger body.

4. The second housing portions are provided as a pair with the first housing portion sandwiched therebetween in the axial direction, The indoor unit according to claim 1 , wherein the refrigerant sensors are provided inside the pair of second housing portions, respectively.

5. The indoor unit according to claim 1 , wherein a plurality of the refrigerant sensors are provided inside the second storage section.

6. The indoor unit according to claim 1 , wherein the refrigerant sensor is located above a lower end of the heat exchanger.

7. a drain pan located below the heat exchanger; The indoor unit according to claim 1 , wherein the refrigerant sensor is located above the drain pan.

8. The indoor unit according to claim 1 , wherein the refrigerant sensor is located below the blower.

9. A control unit is provided, the control unit executes a predetermined first operation when the refrigerant sensor detects the refrigerant, The first operation includes: notifying that the refrigerant has leaked; driving the blower at a predetermined output; Sending an operation stop command to the outdoor unit of the air conditioner; Closing a valve provided in a refrigerant circuit portion connecting the outdoor unit and the indoor unit; The indoor unit according to claim 1 , comprising at least one of the following:

10. The cover member is a box-shaped cover main body portion that opens to a side where the heat exchanger is located in the axial direction; a hollow sensor mounting portion protruding downward from the cover body portion; and The protruding portion is located inside the cover main body, The interior of the sensor mounting portion is connected to the interior of the cover main body portion, The indoor unit according to claim 1 , wherein the first hole is formed in the sensor mounting portion.

11. An indoor unit according to any one of claims 1 to 10; The outdoor unit and An air conditioner comprising:

12. The indoor unit according to claim 9; The outdoor unit and Equipped with A plurality of the indoor units are provided, When the control unit detects refrigerant based on the refrigerant sensor, the control unit sends a signal to the control unit in at least one other of the indoor units to cause it to perform a predetermined second operation.