Indoor unit and air conditioner

Abstract

An indoor unit according to one aspect of the present disclosure is a floor-standing indoor unit comprising: a heat exchanger; a blower which generates airflow; a drain pan; an air passage through which the air flows; a filter which is disposed in the air passage, and a housing. The housing has a front wall part disposed further to the front side than the heat exchanger and the drain pan, a rear wall part disposed further to the rear side than the heat exchanger and the drain pan, and an intake port provided in a portion of the front wall part that is vertically below the blower. The heat exchanger has a front heat exchanger and a rear heat exchanger disposed further to the rear side than the front heat exchanger. The air passage includes a front air passage through which air flows from the intake port toward the front heat exchanger, and a rear air passage through which air flows from the intake port toward the rear heat exchanger. The filter has a first filter section disposed in the front air passage and a second filter section disposed in the rear air passage, with the second filter section being separated from the intake port toward the rear side.

Description

Indoor Unit and Air Conditioner

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

[0002] There is known a floor-standing type indoor unit of an air conditioner that is placed on an indoor floor. As the floor-standing type indoor unit, a suction port provided at the lower part of the front surface of the main body, a blowout port provided at the upper part of the main body, a front-side heat exchanger arranged on the front side of the main body through which an air flow flowing through the front-side air passage passes, a rear-side heat exchanger arranged on the rear side of the front-side heat exchanger through which an air flow flowing through the rear-side air passage passes, and a filter arranged between the intake port, the front-side heat exchanger, and the rear-side heat exchanger are disclosed (see, for example, Patent Document 1).

[0003] Japanese Patent No. 5805305

[0004] In the above indoor unit, since the space between the suction port and the lower part of the filter is narrow, the air flow flowing into the inside of the housing from the suction port easily flows upward along the filter in the front-side air passage. As a result, it is difficult for the air flow to flow into the rear-side air passage, so the difference between the flow rate of the air flow passing through the front-side heat exchanger and the flow rate of the air flow passing through the rear-side heat exchanger becomes large. Therefore, in the above indoor unit, it is difficult to equalize the flow rates of the air flows passing through the two heat exchangers, and it is difficult to improve the heat exchange efficiency between the heat exchangers and the air flow.

[0005] In view of the above circumstances, an object of the present disclosure is to provide an indoor unit and an air conditioner capable of improving the heat exchange efficiency between a heat exchanger and an air flow.

[0006] One embodiment of the indoor unit according to this disclosure is an indoor unit for an air conditioner, and is a floor-standing indoor unit comprising: a heat exchanger; a blower that generates an airflow passing through the heat exchanger; a drain pan positioned vertically below the heat exchanger; an air passage through which the airflow flows; a filter positioned in the air passage; and a housing that accommodates the heat exchanger, the blower, the drain pan, and the filter, wherein the housing comprises a front wall portion positioned in front of the heat exchanger and the drain pan, a rear wall portion positioned behind the heat exchanger and the drain pan, an intake port provided in the portion of the front wall portion vertically below the blower, and an outlet provided vertically above the blower. The heat exchanger has a front heat exchanger and a rear heat exchanger positioned behind the front heat exchanger, and the air passage includes a front air passage, partly formed between the drain pan and the front wall, through which the airflow from the intake port toward the front heat exchanger flows, and a rear air passage, partly formed between the drain pan and the rear wall, through which the airflow from the intake port toward the rear heat exchanger flows, and the filter has a first filter section positioned in the front air passage and a second filter section positioned in the rear air passage, part of the second filter section is located vertically below the drain pan, the rear end of the second filter section is in contact with the rear wall, and the second filter section moves away from the intake port as it moves toward the rear.

[0007] One embodiment of the air conditioner according to this disclosure comprises the above-mentioned indoor unit and an outdoor unit connected to the indoor unit by a circulation path through which a refrigerant circulates.

[0008] According to this disclosure, the heat exchange efficiency between the heat exchanger and the airflow in indoor units and air conditioners can be improved.

[0009] This is a schematic diagram showing the general configuration of the air conditioner in Embodiment 1. This is a perspective view showing the indoor unit in Embodiment 1. This is a longitudinal cross-sectional view showing the indoor unit in Embodiment 1. This is a perspective view showing a part of the indoor unit in Embodiment 1. This is a longitudinal cross-sectional view showing the indoor unit of a comparative example. This is a longitudinal cross-sectional view showing the indoor unit in Embodiment 2. This is a longitudinal cross-sectional view showing the indoor unit in Embodiment 3.

[0010] Embodiments of this disclosure will be described below with reference to the drawings. However, the scope of this disclosure is not limited to the embodiments described below, and can be arbitrarily modified within the scope of the technical concept of this disclosure. Furthermore, in the following drawings, the scale and numbers of each structure may differ from those of the actual structure in order to make each configuration easier to understand.

[0011] The Z-axis is shown in the drawing as appropriate. The direction in which the Z-axis extends is vertical. Of the vertical directions, the side in which the Z-axis arrow points (+Z side) is the "upper vertical side," and the side opposite to the direction in which the Z-axis arrow points (-Z side) is the "downward vertical side." In the following explanation, the "upper vertical side" may be simply referred to as the "upper side," and the "downward vertical side" may be simply referred to as the "downward side."

[0012] The X-axis is shown in the drawings as appropriate. The direction in which the X-axis extends is the front-to-back direction of the indoor unit. In the following description, the front-to-back direction of the indoor unit will simply be referred to as the "front-to-back direction". In this embodiment, the front-to-back direction is perpendicular to the vertical direction. In the following description, of the front-to-back direction, the side in which the X-axis arrow points (+X side) will be referred to as the "front side", and the side opposite to the direction in which the X-axis arrow points (-X side) will be referred to as the "rear side".

[0013] The Y-axis is shown in the drawings as appropriate. The direction in which the Y-axis extends is the left-right direction of the indoor unit. In this embodiment, the left-right direction is perpendicular to both the front-back direction and the vertical direction. In the following description, the side in which the Y-axis arrow points (+Y side) will be referred to as the "right side," and the side opposite to the direction in which the Y-axis arrow points (-Y side) will be referred to as the "left side." Note that the terms upper side, lower side, front side, rear side, right side, and left side are merely names used to describe the relative positional relationship of each part, and the actual arrangement may be different from the arrangement indicated by these names.

[0014] Embodiment 1. Figure 1 is a schematic diagram showing the general configuration of the air conditioner 1 in Embodiment 1. Figure 2 is a perspective view showing the indoor unit 20 in Embodiment 1. Figure 3 is a longitudinal cross-sectional view showing the indoor unit 20 in Embodiment 1. Figure 4 is a perspective view showing a part of the indoor unit 20 in Embodiment 1. As shown in Figure 1, the air conditioner 1 of Embodiment 1 comprises an outdoor unit 10, an indoor unit 20, a circulation path section 18, and a refrigerant 19. The outdoor unit 10 is located outdoors. The indoor unit 20 is located indoors. The outdoor unit 10 and the indoor unit 20 are connected to each other by a circulation path section 18 through which the refrigerant 19 circulates. The air conditioner 1 adjusts the temperature of the indoor air by performing heat exchange between the refrigerant 19 circulating in the circulation path section 18 and the air in the room where the indoor unit 20 is located. As the refrigerant 19, a fluorine-based refrigerant or a hydrocarbon-based refrigerant with a low global warming potential can be used.

[0015] The outdoor unit 10 comprises a housing 11, a compressor 12, an outdoor heat exchanger 13, a flow control valve 14, a blower fan 15, a four-way valve 16, and a control unit 17. The compressor 12, outdoor heat exchanger 13, flow control valve 14, blower fan 15, four-way valve 16, and control unit 17 are housed inside the housing 11. The compressor 12, outdoor heat exchanger 13, flow control valve 14, and four-way valve 16 are each provided in the portion of the circulation path 18 located inside the housing 11. The compressor 12, outdoor heat exchanger 13, flow control valve 14, and four-way valve 16 are each connected by the portion of the circulation path 18 located inside the housing 11.

[0016] The four-way valve 16 is installed in the part of the circulation path 18 that is connected to the discharge side of the compressor 12. The four-way valve 16 reverses the direction in which the refrigerant 19 circulates within the circulation path 18 by switching a part of the circulation path 18. If the path connected to the four-way valve 16 is the path shown by the solid line on the four-way valve 16 in Figure 1, the refrigerant 19 flows within the circulation path 18 in the direction shown by the solid arrow in Figure 1. If the path connected to the four-way valve 16 is the path shown by the dashed line on the four-way valve 16 in Figure 1, the refrigerant 19 flows within the circulation path 18 in the direction shown by the dashed arrow in Figure 1.

[0017] As shown in Figure 2, the indoor unit 20 is a floor-standing indoor unit. The indoor unit 20 is placed on the floor F of the room. Although not shown in the illustration, the rear (-X side) portion of the indoor unit 20 is fixed to the wall W of the room. As shown in Figure 3, the indoor unit 20 comprises a housing 21, a heat exchanger 41, a blower 45, a drain pan 47, an air passage 50, and a filter 60. Also, as shown in Figure 1, the indoor unit 20 includes a control device 70. As shown in Figure 3, the heat exchanger 41, the blower 45, the drain pan 47, and the filter 60 are each housed inside the housing 21. That is, the housing 21 houses the heat exchanger 41, the blower 45, the drain pan 47, and the filter 60. Also, although not shown in the illustration, the control device 70 is housed inside the housing 21. The indoor unit 20 performs cooling operation to cool the indoor air and heating operation to heat the indoor air.

[0018] When the indoor unit 20 is operating in cooling mode, the refrigerant 19 flowing through the circulation path 18 flows in the direction indicated by the solid arrow in Figure 1. That is, the refrigerant 19 flowing through the circulation path 18 passes through the compressor 12, the outdoor heat exchanger 13, the flow control valve 14, and the heat exchanger 41 in that order, and returns to the compressor 12. In cooling mode, the outdoor heat exchanger 13 functions as a condenser, and the heat exchanger 41 functions as an evaporator.

[0019] When the indoor unit 20 is operating in heating mode, the refrigerant 19 flowing through the circulation path 18 flows in the direction shown by the dashed line in Figure 1. That is, the refrigerant 19 flowing through the circulation path 18 passes through the compressor 12, heat exchanger 41, flow control valve 14, and outdoor heat exchanger 13 in that order, and returns to the compressor 12. In heating mode, the outdoor heat exchanger 13 functions as an evaporator, and the heat exchanger 41 functions as a condenser.

[0020] Next, the indoor unit 20 of Embodiment 1 will be described in detail. As shown in Figure 2, the housing 21 is a roughly rectangular box shape. The housing 21 has a housing body 22, a front panel 30, and a front wall portion 32. The housing 21 is also provided with an intake port 31 and an outlet port 22c.

[0021] The housing body 22 is a roughly rectangular box shape. As shown in Figure 3, the housing body 22 houses the heat exchanger 41, the blower 45, the drain pan 47, and the filter 60, respectively. As shown in Figure 4, the housing body 22 has a front wall portion 23, an upper wall portion 24, a first side wall portion 26a, and a second side wall portion 26c. Also, as shown in Figure 3, the housing body 22 has a lower wall portion 25 and a rear wall portion 27.

[0022] The housing front wall portion 23 covers the internal space of the housing 21 from the front (+X side). As shown in Figure 4, the housing front wall portion 23 is provided with an opening 23a that penetrates the housing front wall portion 23 in the front-to-back direction (X-axis direction). Viewed from the front-to-back direction, the opening 23a is substantially rectangular in shape with its long side extending in the left-to-right direction (Y-axis direction). Viewed from the front-to-back direction, the opening 23a may also be circular or have other shapes. As shown in Figure 3, the vertically upper end 23b of the opening 23a is located above the heat exchanger 41 and the filter 60. As shown in Figure 4, the housing front wall portion 23 has an upper cover 23c. The upper cover 23c is the portion of the housing front wall portion 23 above the opening 23a. Viewed from the front-to-back direction, the upper cover 23c is substantially rectangular in shape with its long side extending in the left-to-right direction.

[0023] The upper wall portion 24 is plate-shaped, extending in a direction perpendicular to the vertical direction. When viewed from the vertical direction, the upper wall portion 24 is roughly rectangular in shape, with its longer side extending in the left-right direction (Y-axis direction). The upper wall portion 24 covers the internal space of the housing 21 from above.

[0024] The first side wall portion 26a is plate-shaped, extending in a direction perpendicular to the left-right direction. When viewed from the left-right direction, the first side wall portion 26a is substantially rectangular in shape, with its longer side extending vertically. The first side wall portion 26a covers the internal space of the housing 21 from the right side (+Y side). Although not shown in the illustration, the second side wall portion 26c is plate-shaped, extending in a direction perpendicular to the left-right direction. Although not shown in the illustration, when viewed from the left-right direction, the second side wall portion 26c is substantially rectangular in shape, with its longer side extending vertically. The second side wall portion 26c covers the internal space of the housing 21 from the left side (-Y side).

[0025] The lower wall portion 25 is plate-shaped, extending in a direction perpendicular to the vertical direction. Although not shown in the illustration, when viewed from the vertical direction, the lower wall portion 25 is roughly rectangular in shape, with its longer side extending in the left-right direction (Y-axis direction). As shown in Figure 3, the lower wall portion 25 covers the internal space of the housing 21 from below.

[0026] The rear wall portion 27 covers the internal space of the housing 21 from the rear (-X side). The rear wall portion 27 is positioned behind both the heat exchanger 41 and the drain pan 47. The rear wall portion 27 faces both the heat exchanger 41 and the drain pan 47 with a gap in the front-rear direction (X-axis direction). The rear wall portion 27 has a first rear wall portion 27a, a second rear wall portion 27c, a third rear wall portion 27e, and a fourth rear wall portion 27g. Each of the first rear wall portion 27a, the second rear wall portion 27c, the third rear wall portion 27e, and the fourth rear wall portion 27g is a part of the rear wall portion 27.

[0027] The first rear wall portion 27a is plate-shaped and extends in a direction perpendicular to the front-to-back direction (X-axis direction). Although not shown in the figure, when viewed from the front-to-back direction, the first rear wall portion 27a is roughly rectangular in shape with its longer side extending in the left-to-right direction (Y-axis direction). The upper end of the first rear wall portion 27a is located above the rear heat exchanger 43, which will be described later. The lower end of the first rear wall portion 27a is located below the drain pan 47. The first rear wall portion 27a faces the rear heat exchanger 43 and the drain pan 47 in the front-to-back direction, with a gap between them.

[0028] When viewed from the left-right direction (Y-axis direction), the second rear wall portion 27c is plate-shaped and is located towards the front (+X side) as it extends downwards. The upper end of the second rear wall portion 27c is connected to the lower end of the first rear wall portion 27a.

[0029] The third rear wall portion 27e is located above the first rear wall portion 27a. The lower end of the third rear wall portion 27e is connected to the upper end of the first rear wall portion 27a. The upper end of the third rear wall portion 27e is connected to the upper wall portion 24. The front side (+X side) of the third rear wall portion 27e is curved so as to be convex towards the rear side (-X side). The third rear wall portion 27e is spaced apart from the blower 45 and faces it in the front-rear direction (X-axis direction).

[0030] The fourth rear wall portion 27g is plate-shaped and extends in a direction perpendicular to the front-rear direction. The upper end of the fourth rear wall portion 27g is connected to the lower end of the second rear wall portion 27c. The lower end of the fourth rear wall portion 27g is connected to the lower wall portion 25.

[0031] As shown in Figure 4, the air outlet 22c is a hole that spans the upper wall portion 24 and the upper cover 23c. As shown in Figure 3, the air outlet 22c is located vertically above the blower 45 and the heat exchanger 41, respectively. As shown in Figure 4, the portion of the air outlet 22c provided on the upper wall portion 24 is substantially rectangular in shape, with its longer side extending in the left-right direction (Y-axis direction) when viewed from the vertical direction. The portion of the air outlet 22c provided on the upper cover 23c is substantially rectangular in shape, with its longer side extending in the left-right direction when viewed from the front-back direction (X-axis direction). As shown in Figure 3, the air outlet 22c is fitted with a plurality of wind direction vanes 34 that control the direction in which the third airflow AF3 blown out from inside the housing 21 flows. In Embodiment 1, the control device 70 controls the direction of the third airflow AF3 blown out from the air outlet 22c to the outside of the housing 21 by rotating each wind direction vane 34.

[0032] The front panel 30 shown in Figure 2 is plate-shaped and extends in a direction perpendicular to the front-to-back direction (X-axis direction). When viewed from the front-to-back direction, the front panel 30 is roughly rectangular in shape, with its longer side extending in the left-to-right direction (Y-axis direction). The front panel 30 is detachably attached to the portion of the housing front wall 23 that is lower than the upper cover 23c. In other words, the front panel 30 is detachably attached to the housing body 22. The front panel 30 closes the opening 23a shown in Figure 4 from the front side (+X side). As shown in Figure 4, when the front panel 30 is removed from the housing body 22, the opening 23a is exposed to the outside of the housing 21. As a result, the internal space of the housing body 22 and the outside of the housing body 22 are connected through the opening 23a.

[0033] As shown in Figure 2, in Embodiment 1, the front wall portion 32 is composed of the upper cover 23c and the front panel 30. That is, the front panel 30 is a part of the front wall portion 32. As shown in Figure 3, the front wall portion 32 is positioned in front of (to the +X side of) both the heat exchanger 41 and the drain pan 47. The front wall portion 32 faces both the heat exchanger 41 and the drain pan 47 with a gap in the front-to-back direction (in the X-axis direction).

[0034] The suction port 31 is a hole that penetrates the lower part of the front panel 30 in the front-to-back direction. Thus, the housing 21 has the suction port 31. As shown in Figure 2, when viewed from the front-to-back direction, the suction port 31 is a substantially rectangular hole with its longer side extending in the left-to-right direction (Y-axis direction). As shown in Figure 3, the outside of the housing 21 and the internal space of the housing 21 are connected through the suction port 31. The suction port 31 is provided in the part of the front wall 32 that is vertically lower than the blower 45. In Embodiment 1, when viewed from the front-to-back direction, the upper end of the suction port 31 overlaps with the drain pan 47. The upper end of the suction port 31 may be located below the drain pan 47 or above the drain pan 47. In Embodiment 1, when viewed from the left-to-right direction, the suction port 31 extends vertically. When viewed from the left-to-right direction, the suction port 31 may be straight or curved, located towards the rear (-X side) as it goes downwards.

[0035] The blower 45 is a fan that generates an airflow, which is the flow of air from the intake port 31 to the outlet port 22c. In Embodiment 1, the airflow includes a first airflow AF1, a second airflow AF2, and a third airflow AF3. The first airflow AF1 and the second airflow AF2 are the airflow that passes through the filter 60 and the heat exchanger 41, respectively. The third airflow AF3 is the airflow that is blown out from the outlet port 22c to the outside of the housing 21. Although not shown in the figures, the blower 45 is substantially cylindrical in shape and extends in the left-right direction (Y-axis direction). The blower 45 is located in the upper part of the internal space of the housing 21. The blower 45 is positioned opposite the third rear wall portion 27e in the front-rear direction (X-axis direction) with a gap between them. The control device 70 can rotate a plurality of impellers (not shown) of the blower 45 around the rotation axis J. In Embodiment 1, the rotation axis J is a virtual axis that extends in the left-right direction and passes through the center of the blower 45. When multiple impellers rotate around the rotation axis J, airflows AF1, AF2, and AF3 are generated.

[0036] The heat exchanger 41 adjusts the temperature of the third airflow AF3 that is blown out of the housing 21 from the outlet 22c by exchanging heat with the first airflow AF1 and the second airflow AF2, respectively. As described above, when the indoor unit 20 is in cooling operation, the heat exchanger 41 functions as an evaporator, and when the indoor unit 20 is in heating operation, the heat exchanger 41 functions as a condenser. The heat exchanger 41 has a front heat exchanger 42 and a rear heat exchanger 43.

[0037] Although not shown in the diagram, the front heat exchanger 42 is a roughly rectangular parallelepiped extending in the left-right direction (Y-axis direction). In Embodiment 1, the front heat exchanger 42 is positioned towards the front (+X side) as it moves upward. In the front-rear direction (X-axis direction), the upper part of the front heat exchanger 42 is positioned between the front wall 32 and the blower 45. In Embodiment 1, the upper end of the front heat exchanger 42 is located above the rotation axis J and below the vertically upper end 23b of the opening 23a. The lower end of the front heat exchanger 42 is located above the drain pan 47.

[0038] Although not shown in the diagram, the rear heat exchanger 43 is a roughly rectangular parallelepiped extending in the left-right direction (Y-axis direction). In the front-back direction (X-axis direction), the rear heat exchanger 43 is positioned between the rear wall portion 27 and the front heat exchanger 42. In Embodiment 1, the rear heat exchanger 43 is positioned towards the rear (-X side) as it moves upward. The rear heat exchanger 43 is positioned behind the front heat exchanger 42. As a result, when viewed from the left-right direction, the front heat exchanger 42 and the rear heat exchanger 43 are arranged in a V-shape that opens upward. In Embodiment 1, the rear heat exchanger 43 is positioned below the blower 45. The lower end of the rear heat exchanger 43 is located above the drain pan 47.

[0039] The drain pan 47 is a container for temporarily storing condensed water generated in the heat exchanger 41. The drain pan 47 has an opening on the top. The drain pan 47 is located below both the front heat exchanger 42 and the rear heat exchanger 43. That is, the drain pan 47 is located vertically below the heat exchanger 41. The drain pan 47 is positioned opposite the front wall portion 32 and the rear wall portion 27 in the front-to-back direction (X-axis direction) with a gap between them. The front (+X side) end of the drain pan 47 is located in front of the lower end of the front heat exchanger 42, and the rear (-X side) end of the drain pan 47 is located behind the lower end of the rear heat exchanger 43. As a result, the condensed water generated in the heat exchanger 41 drips into the drain pan 47.

[0040] The air passage 50 is a passage through which airflows AF1, AF2, and AF3 flow inside the housing 21. The air passage 50 includes a front air passage 51, a rear air passage 52, and a discharge air passage 53. The front air passage 51 is an air passage through which the first airflow AF1 flows from the intake port 31 toward the front heat exchanger 42. The front air passage 51 is composed of the front heat exchanger 42, the drain pan 47, and the front wall portion 32. The front air passage 51 is a space enclosed by the front heat exchanger 42, the drain pan 47, and the front wall portion 32. A part of the front air passage 51 is formed between the drain pan 47 and the front wall portion 32.

[0041] The rear air passage 52 is an air passage through which the second airflow AF2 flows from the intake port 31 toward the rear heat exchanger 43. The rear air passage 52 is composed of the rear heat exchanger 43, the drain pan 47, the lower wall portion 25, and the rear wall portion 27. More specifically, the rear air passage 52 is composed of the rear heat exchanger 43, the drain pan 47, the lower wall portion 25, the fourth rear wall portion 27g, the second rear wall portion 27c, and the first rear wall portion 27a. The rear air passage 52 is composed of the space between the drain pan 47 and the lower wall portion 25, the space between the drain pan 47 and the second rear wall portion 27c, and the space between the rear heat exchanger 43 and the drain pan 47 and the first rear wall portion 27a. A part of the rear air passage 52 is formed between the drain pan 47 and the rear wall portion 27.

[0042] The air outlet passage 53 is an air passage through which the third airflow AF3 blown out from the outlet 22c to the outside of the housing 21 flows. The air outlet passage 53 is composed of the blower 45, the third rear wall 27e, the upper wall 24, and the upper cover 23c. The air outlet passage 53 is the space enclosed by the blower 45, the third rear wall 27e, the upper wall 24, and the upper cover 23c.

[0043] The filter 60 is a filter that removes dust and other foreign matter from the airflows AF1 and AF2 that flow into the housing 21 from the intake port 31. The filter 60 is placed in the air passage 50. The airflows AF1 and AF2 can pass through the filter 60 in the thickness direction. The resistance of the airflows AF1 and AF2 as they pass through the filter 60 decreases as the angle between the direction in which the surface of the filter 60 faces and the direction in which the airflows AF1 and AF2 flow becomes smaller. In other words, by making the direction in which the surface of the filter 60 faces parallel to the direction in which the airflows AF1 and AF2 flow, the resistance of the airflows AF1 and AF2 as they pass through the filter 60 can be reduced. The filter 60 is supported by rails 29 of the housing body 22. Although not shown in the diagram, the housing body 22 has two rails 29, one rail 29 supporting the entire right (+Y) end of the filter 60, and the other rail 29 supporting the entire left (-Y) end of the filter 60. The filter 60 has a first filter section 61 and a second filter section 62. Note that the first filter section 61 and the second filter section 62 are each part of the filter 60.

[0044] The first filter unit 61 is disposed in the front air passage 51. When viewed from the left - right direction (Y - axis direction), the first filter unit 61 is linear and located on the front side (+X side) as it goes upward. The first filter unit 61 is disposed in front of each of the front heat exchanger 42 and the drain pan 47. The first filter unit 61 is disposed on the rear side (-X side) of the front wall portion 32. In Embodiment 1, the first filter unit 61 extends linearly along the front heat exchanger 42. In the vertical direction, the upper - end portion of the first filter unit 61 in the vertical direction is located below the upper - end portion 23b of the opening 23a in the vertical direction. Also, in the vertical direction, the upper - end portion of the first filter unit 61 in the vertical direction is located above the rotation axis J of the blower 45. The lower end of the first filter unit 61 is located below the drain pan 47. The first air flow AF1 passes through the first filter unit 61. Thereby, the first filter unit 61 removes foreign matters such as dust from the first air flow AF1. Note that the first filter unit 61 may have other shapes such as a linear shape extending in the vertical direction and a curved shape located on the front side as it goes upward when viewed from the left - right direction.

[0045] The second filter section 62 is located in the rear air passage 52. When viewed from the left-right direction (Y-axis direction), the second filter section 62 is located towards the rear (-X side) as it moves downward. In Embodiment 1, when viewed from the left-right direction, the second filter section 62 is curved and protrudes downward. Therefore, when viewed from the left-right direction, a part of the filter 60 is curved. The front (+X side) end of the second filter section 62 is connected to the lower end of the first filter section 61. That is, the vertically lower end of the first filter section 61 is connected to the front end of the second filter section 62. In Embodiment 1, the rear end of the second filter section 62 is in contact with the second rear wall section 27c. That is, the rear end of the second filter section 62 is in contact with the rear wall section 27. The rear end of the second filter section 62 is located vertically below the drain pan 47. A portion of the second filter section 62 is located below the drain pan 47. The second filter section 62 moves away from the suction port 31 as it approaches the rear. This allows for a wider space 55 between the suction port 31 and the second filter section 62. The second airflow AF2 passes through the second filter section 62. As a result, the second filter section 62 removes dust and other foreign matter from the second airflow AF2. Note that the shape of the second filter section 62 is not limited to the shape of Embodiment 1, as long as it moves away from the suction port 31 as it approaches the rear. For example, it may be a straight line that is located towards the rear as it approaches the bottom when viewed from the left and right directions. Also, the rear end of the second filter section 62 may be in contact with the first rear wall section 27a or with the fourth rear wall section 27g.

[0046] In Embodiment 1, when the amount of foreign matter such as dust adhering to the filter 60 increases, the resistance when the airflows AF1 and AF2 pass through the filter 60 increases. Therefore, when the amount of foreign matter such as dust adhering to the filter 60 increases, the filter 60 is maintained. When maintaining the filter 60, the user or the like removes the front panel 30 from the housing body 22, and then grasps the upper end of the filter 60 through the opening 23a and pulls the filter 60 forward (the +X side) to remove the filter 60 from the housing body 22. At this time, the filter 60 moves along the two rails 29. Thereafter, the user or the like inserts the cleaned filter 60 or a new filter 60 into the housing body 22 from above the two rails 29 through the opening 23a, and moves the filter 60 while guiding it along the two rails 29 to attach the filter 60 to the housing body 22.

[0047] Next, the flow of the airflows AF1, AF2, and AF3 will be described. When the control device 70 rotates the blower 45 around the rotation axis J, the indoor air flows into the housing 21 through the suction port 31. A part of the air flowing into the housing 21 flows as the first airflow AF1 upward in the front air passage 51 and is dust-removed when passing through the first filter unit 61. The first airflow AF1 passing through the first filter unit 61 is cooled or heated by heat exchange with the refrigerant 19 flowing inside the front heat exchanger 42 when passing through the front heat exchanger 42. The first airflow AF1 passing through the front heat exchanger 42 reaches the blower 45.

[0048] Another part of the air flowing into the housing 21 flows as the second airflow AF2 rearward (the -X side) in the rear air passage 52 and is dust-removed when passing through the second filter unit 62. The second airflow AF2 passing through the second filter unit 62 flows upward between the drain pan 47 and the rear wall portion 27, and then is cooled or heated by heat exchange with the refrigerant 19 flowing inside the rear heat exchanger 43 when passing through the rear heat exchanger 43. The second airflow AF2 passing through the rear heat exchanger 43 reaches the blower 45.

[0049] The first airflow AF1 and the second airflow AF2 that reach the blower 45 are converted into a third airflow AF3 by the blower 45 and flow through the outlet 53 toward the outlet 22c, where they are blown out to the outside of the housing 21. The control device 70 controls the direction of the third airflow AF3 blown out from the outlet 22c to the outside of the housing 21 by rotating each airflow vane 34 to a predetermined angle. This makes it possible to deliver the third airflow AF3 at a predetermined temperature to a predetermined location in the room.

[0050] Figure 5 is a vertical cross-sectional view showing the indoor unit 120 of the comparative example. Next, the flow rates of airflows AF1 and AF2 in the indoor unit 120 of the comparative example air conditioner 101 will be described. The filter 160 of the indoor unit 120 of the comparative example has a first filter section 61 and a second filter section 162. The configuration of the first filter section 61 of the comparative example is the same as the configuration of the first filter section 61 of Embodiment 1 described above. The second filter section 162 is linear and located towards the front (+X side) as it goes downwards. The second filter section 162 approaches the intake port 31 as it goes downwards. The upper end of the second filter section 162 is connected to the lower end of the first filter section 61. The lower end of the second filter section 162 is in contact with the lower wall section 25. The airflow paths AF1, AF2, and AF3 in the comparative indoor unit 120 are the same as those in Embodiment 1 described above, so no explanation is provided. The other configurations of the comparative air conditioner 101 are the same as those of Embodiment 1 described above.

[0051] As described above, in the comparative example indoor unit 120, the second filter section 162 approaches the intake port 31 as it moves downwards. As a result, the space 155 between the intake port 31 and the second filter section 162 is narrow, making it difficult for air flowing from the intake port 31 into the housing 21 to pass through the second filter section 162, and instead making it easier for the air to flow upward along the first filter section 61 in the front air passage 51. Therefore, it is difficult for the second airflow AF2 to pass through the second filter section 162 and flow into the rear air passage 52, making it difficult to increase the flow rate of the second airflow AF2 flowing through the rear air passage 52. As a result, the difference between the flow rate of the first airflow AF1 passing through the front heat exchanger 42 and the flow rate of the second airflow AF2 passing through the rear heat exchanger 43 becomes large, making it difficult to equalize the flow rates of the airflows AF1 and AF2 passing through the heat exchanger 41. Therefore, it was difficult to improve the heat exchange efficiency between the heat exchanger 41, the airflow, and AF1 and AF2.

[0052] In contrast to the comparative indoor unit 120, in the indoor unit 20 of Embodiment 1, as described above, the second filter section 62 is further away from the intake port 31 as it moves toward the rear (-X side). As a result, as shown in Figure 3, the space 55 between the intake port 31 and the second filter section 62 can be widened, so that the air flowing into the housing 21 from the intake port 31 can easily pass through the second filter section 62. Therefore, the second airflow AF2 can easily pass through the second filter section 62 and flow into the rear air passage 52, thereby increasing the flow rate of the second airflow AF2 flowing through the rear air passage 52. As a result, the difference in flow rate between the first airflow AF1 passing through the front heat exchanger 42 and the second airflow AF2 passing through the rear heat exchanger 43 can be reduced, thus making the flow rates of the airflows AF1 and AF2 passing through the heat exchanger 41 more uniform. Therefore, the heat exchange efficiency between the heat exchanger 41 and the airflows AF1 and AF2 can be increased.

[0053] According to Embodiment 1, the indoor unit 20 is an indoor unit 20 provided by the air conditioner 1, and is a floor-standing indoor unit 20 comprising a heat exchanger 41, a blower 45 that generates airflows AF1 and AF2 that pass through the heat exchanger 41, a drain pan 47 positioned vertically below the heat exchanger 41, an air passage 50 through which the airflows AF1 and AF2 flow, a filter 60 positioned in the air passage 50, and a housing 21 that houses the heat exchanger 41, the blower 45, the drain pan 47, and the filter 60, respectively. The housing 21 has a front wall portion 32 positioned in front of (+X side) the heat exchanger 41 and the drain pan 47, a rear wall portion 27 positioned behind (-X side) the heat exchanger 41 and the drain pan 47, an intake port 31 provided in the portion of the front wall portion 32 that is vertically below the blower 45, and an outlet port 22c provided vertically above the blower 45. The heat exchanger 41 has a front heat exchanger 42 and a rear heat exchanger 43 positioned behind the front heat exchanger 42. The air passage 50 is formed in part between the drain pan 47 and the front wall portion 32, and the intake port 31 The filter 60 includes a front air passage 51 through which a first airflow AF1 flows toward the front heat exchanger 42, and a rear air passage 52 through which a second airflow AF2 flows toward the rear heat exchanger 43, with a portion of the passage formed between the drain pan 47 and the rear wall 27. The filter 60 has a first filter section 61 located in the front air passage 51 and a second filter section 62 located in the rear air passage 52. A portion of the second filter section 62 is located vertically below the drain pan 47, and the rear end of the second filter section 62 is in contact with the rear wall 27. The second filter section 62 moves away from the intake port 31 as it moves toward the rear. Therefore, as described above, in the first embodiment, the space 55 between the intake port 31 and the second filter section 62 can be widened, making it easier for air flowing into the housing 21 from the intake port 31 to pass through the second filter section 62. Therefore, the flow rate of the second airflow AF2 flowing through the rear air passage 52 can be increased. As a result, as described above, the flow rates of the airflows AF1 and AF2 passing through the heat exchanger 41 can be made more uniform. Therefore, the heat exchange efficiency between the heat exchanger 41 and the airflows AF1 and AF2 can be increased. Consequently, the heating and cooling performance of the air conditioner 1 can be improved.

[0054] Furthermore, in Embodiment 1, as described above, the second filter section 62 is located towards the rear (-X side) as it moves downwards. In addition, as shown in Figure 3, the second airflow AF2 flows in a direction inclined from the top to the rear as it passes through the second filter section 62. As a result, it is easier to make the direction in which the surface of the second filter section 62 faces parallel to the direction in which the second airflow AF2 flows, and as described above, the resistance when the second airflow AF2 passes through the second filter section 62 can be reduced. Therefore, the flow rate of the second airflow AF2 that passes through the second filter section 62 and flows into the rear air passage 52 can be more favorably increased. This makes it possible to more favorably equalize the flow rates of the airflows AF1 and AF2 passing through the heat exchanger 41. Therefore, the heat exchange efficiency between the heat exchanger 41 and the airflows AF1 and AF2 can be more favorably increased. As a result, the heating and cooling performance of the air conditioner 1 can be more favorably improved.

[0055] According to Embodiment 1, the housing 21 includes a housing body 22 that houses the heat exchanger 41, the blower 45, the drain pan 47, and the filter 60, and a front panel 30 that is detachably attached to the housing body 22. The housing body 22 has an opening 23a that opens to the front (+X side), and the front panel 30 closes the opening 23a from the front. In the vertical direction, the upper vertical end of the first filter section 61 is positioned vertically lower than the upper vertical end 23b of the opening 23a, and vertically higher than the rotation axis J of the blower 45. Therefore, in the axial direction, the upper end of the first filter section 61 can be positioned close to the upper end of the front heat exchanger 42. This allows the first airflow AF1 to pass through the entire vertical area of ​​the front heat exchanger 42. As a result, the heat exchange efficiency between the front heat exchanger 42 and the first airflow AF1 can be suitably increased.

[0056] As described above, when performing maintenance on the filter 60, the user removes the filter 60 from the housing body 22 by grasping the upper end of the filter 60 through the opening 23a and pulling the filter 60 forward (towards the +X side). The user also installs the filter 60 into the housing body 22 by inserting the cleaned filter 60 or a new filter 60 into the housing body 22 from above the two rails 29 through the opening 23a and moving the filter 60 along the two rails 29. As described above, in Embodiment 1, the vertically upper end of the first filter section 61 is located vertically below the vertically upper end 23b of the opening 23a. Therefore, when removing the filter 60 from the housing body 22 and when installing the filter 60 into the housing body 22, contact between the filter 60 and the upper cover 23c can be suppressed. Thus, the maintainability of the filter 60 can be improved.

[0057] According to Embodiment 1, in the vertical direction, the rear (-X side) end of the second filter section 62 is located vertically below the drain pan 47. If the rear end of the second filter section 62 is located above the drain pan 47, the curvature of the second filter section 62 becomes too large, and the curvature of the part of the rail 29 that supports the second filter section 62 becomes too large. Therefore, when attaching the filter 60 to the housing body 22, it is difficult to move the filter 60 along the rail 29, making it difficult to improve the maintainability of the filter 60. In contrast, in Embodiment 1, as described above, since the rear end of the second filter section 62 is located below the drain pan 47, it is possible to suppress the curvature of the second filter section 62 from becoming too large. This prevents the curvature of the part of the rail 29 that supports the second filter section 62 from becoming too large. Therefore, when attaching the filter 60 to the housing body 22, it is easier to move the filter 60 along the rail 29, thus improving the maintainability of the filter 60.

[0058] According to Embodiment 1, a portion of the filter 60 is curved when viewed from a direction perpendicular to both the left-right direction (Y-axis direction), i.e., the front-back direction (X-axis direction), and the vertical direction. When a portion of the filter 60 is bent, the bent portion is likely to catch on the rail 29 when attaching the filter 60 to the housing body 22 by moving the filter 60 along the rail 29. Therefore, it is difficult to move the filter 60 along the rail 29, making it difficult to improve the maintainability of the filter 60. In contrast, in Embodiment 1, since a portion of the filter 60 is curved, it is easier to prevent the filter 60 from catching on the rail 29 when moving the filter 60 along the rail 29. Therefore, it is easier to move the filter 60 along the rail 29, making it possible to more favorably improve the maintainability of the filter 60.

[0059] According to Embodiment 1, when viewed from the left-right direction (Y-axis direction), the first filter section 61 is straight, and the second filter section 62 is curved, with the lower vertical end of the first filter section 61 connected to the front (+X side) end of the second filter section 62. If the second filter section 62 is straight, the part where the first filter section 61 and the second filter section 62 connect will be bent. Therefore, when attaching the filter 60 to the housing body 22, the part where the first filter section 61 and the second filter section 62 connect is likely to get caught on the rail 29. Consequently, it is difficult to improve the maintainability of the filter 60. In contrast, in Embodiment 1, since the second filter section 62 is curved, it is easier to suppress the bending of the part where the first filter section 61 and the second filter section 62 connect. Therefore, when attaching the filter 60 to the housing body 22, it is easier to suppress the part where the first filter section 61 and the second filter section 62 connect getting caught on the rail 29. Therefore, the maintainability of the filter 60 can be more favorably improved.

[0060] According to Embodiment 1, the air conditioner 1 comprises an indoor unit 20 and an outdoor unit 10 connected to the indoor unit 20 by a circulation path 18 through which the refrigerant 19 circulates. As described above, in the indoor unit 20 of Embodiment 1, the flow rates of the airflows AF1 and AF2 passing through the heat exchanger 41 can be made uniform, thereby increasing the heat exchange efficiency between the heat exchanger 41 and the airflows AF1 and AF2. Therefore, the heating and cooling performance of the air conditioner 1 can be improved.

[0061] Furthermore, in Embodiment 1, as described above, the heat exchange efficiency between the heat exchanger 41 and the airflows AF1 and AF2 can be suitably increased, thereby reducing the flow rate of the refrigerant 19 supplied to the heat exchanger 41. This reduces the power consumed by the compressor 12 of the outdoor unit 10. Therefore, the air conditioner 1 can be made more energy-efficient.

[0062] Embodiment 2. Figure 6 is a longitudinal cross-sectional view showing the indoor unit 220 in Embodiment 2. In the following description, components similar to those in Embodiment 1 described above may be omitted from the description by using the same reference numerals as appropriate.

[0063] As shown in Figure 6, the indoor unit 220 of the air conditioner 201 of Embodiment 2 comprises a housing 21, a heat exchanger 41, a blower 45, a drain pan 47, an air passage 50, a filter 260, and a control device 70 (see Figure 1). The housing 21 houses the heat exchanger 41, the blower 45, the drain pan 47, the filter 260, and the control device 70, respectively.

[0064] The filter 260 is a filter that removes foreign matter such as dust from the airflow AF1 and AF2 that flows into the housing 21 from the intake port 31. The filter 260 is positioned in the air passage 50. The filter 260 is supported by rails 229 of the housing body 22. The filter 260 has a first filter section 61 and a second filter section 262. The configuration of the first filter section 61 in Embodiment 2 is the same as the configuration of the first filter section 61 in Embodiment 1 described above.

[0065] The second filter section 262 is located in the rear air passage 52. When viewed from the left-right direction (Y-axis direction), the second filter section 262 is linear in shape and is located towards the rear (-X side) as it extends downward in the vertical direction. The lower vertical end of the first filter section 61 is connected to the front (+X side) end of the second filter section 262. In Embodiment 2, the rear end of the second filter section 262 is in contact with the second rear wall section 27c. That is, the rear end of the second filter section 262 is in contact with the rear wall section 27. The rear end of the second filter section 262 is located vertically below the drain pan 47. A part of the second filter section 262 is located below the drain pan 47. The second filter section 262 moves away from the suction port 31 as it extends towards the rear. This makes it possible to widen the space 255 between the suction port 31 and the second filter section 262. The second airflow AF2 passes through the second filter section 262. As a result, the second filter section 262 removes dust and other foreign matter from the second airflow AF2. Other configurations of the filter 260 in Embodiment 2 are the same as those of the filter 60 in Embodiment 1 described above. Other configurations of the indoor unit 220 in Embodiment 2 are the same as those of the indoor unit 20 in Embodiment 1 described above.

[0066] Next, the flow rates of the airflows AF1 and AF2 in the indoor unit 220 will be described. In the indoor unit 220 of Embodiment 2, as described above, the second filter section 262 is further away from the intake port 31 as it moves toward the rear side (-X side). As a result, as described above, the space 255 between the intake port 31 and the second filter section 262 can be widened, so that the air that flows into the housing 21 from the intake port 31 can easily pass through the second filter section 262. Therefore, the second airflow AF2 can easily pass through the second filter section 262 and flow into the rear air passage 52, thereby increasing the flow rate of the second airflow AF2 flowing through the rear air passage 52. As a result, the difference in flow rate between the first airflow AF1 passing through the front heat exchanger 42 and the second airflow AF2 passing through the rear heat exchanger 43 can be reduced, thus making the flow rates of the airflows AF1 and AF2 passing through the heat exchanger 41 more uniform. Therefore, the heat exchange efficiency between the heat exchanger 41 and the airflows AF1 and AF2 can be increased.

[0067] According to Embodiment 2, when viewed from a direction perpendicular to both the left-right direction (Y-axis direction), i.e., the front-back direction (X-axis direction), and the vertical direction, the second filter section 262 is linear in shape and is located towards the rear (-X side) as it moves downward in the vertical direction. As shown in Figure 6, when the second airflow AF2 passes through the second filter section 262, it flows in a direction inclined from the top to the rear. Therefore, it is easy to make the direction in which the surface of the second filter section 262 faces parallel to the direction in which the second airflow AF2 flows, thereby reducing the resistance of the second airflow AF2 as it passes through the second filter section 262. Thus, the flow rate of the second airflow AF2 that passes through the second filter section 262 and flows into the rear air passage 52 can be more effectively increased. As a result, the flow rate of the airflows AF1 and AF2 passing through the heat exchanger 41 can be more effectively made uniform. Therefore, the heat exchange efficiency between the heat exchanger 41 and the airflows AF1 and AF2 can be more effectively increased. Therefore, the heating and cooling performance of the air conditioner 201 can be more effectively improved.

[0068] Embodiment 3. Figure 7 is a longitudinal cross-sectional view showing the indoor unit 320 in Embodiment 3. In the following description, components similar to those in Embodiment 1 described above may be omitted from the description by using the same reference numerals as appropriate.

[0069] As shown in Figure 7, the indoor unit 320 of the air conditioner 301 of Embodiment 3 comprises a housing 21, a heat exchanger 41, a blower 45, a drain pan 47, an air passage 50, a filter 360, and a control device 70 (see Figure 1). The housing 21 houses the heat exchanger 41, the blower 45, the drain pan 47, the filter 360, and the control device 70, respectively.

[0070] The filter 360 is a filter that removes foreign matter such as dust from the airflow AF1 and AF2 that flows into the housing 21 from the intake port 31. The filter 360 is positioned in the air passage 50. The filter 360 is supported by a rail 329 of the housing body 22. The filter 360 has a first filter section 61 and a second filter section 362. The configuration of the first filter section 61 in Embodiment 3 is the same as the configuration of the first filter section 61 in Embodiment 1 described above.

[0071] The second filter section 362 is located in the rear air passage 52. When viewed from the left-right direction (Y-axis direction), the second filter section 362 is a straight line extending from the lower vertical end of the first filter section 61 to the rear (-X side). The lower vertical end of the first filter section 61 is connected to the front (+X side) end of the second filter section 362. In embodiment 3, the rear end of the second filter section 362 is in contact with the first rear wall section 27a. That is, the rear end of the second filter section 362 is in contact with the rear wall section 27. The rear end of the second filter section 362 is located vertically below the drain pan 47. A part of the second filter section 362 is located below the drain pan 47. The second filter section 362 moves away from the suction port 31 as it moves towards the rear. This allows the space 355 between the intake port 31 and the second filter section 362 to be widened. The second airflow AF2 passes through the second filter section 362. As a result, the second filter section 362 removes dust and other foreign matter from the second airflow AF2. The other configurations of the filter 360 in Embodiment 3 are the same as the other configurations of the filter 60 in Embodiment 1 described above. The other configurations of the indoor unit 320 in Embodiment 3 are the same as the other configurations of the indoor unit 20 in Embodiment 1 described above.

[0072] Next, the flow rates of the airflows AF1 and AF2 in the indoor unit 320 will be described. In the indoor unit 320 of Embodiment 3, as described above, the second filter section 362 is further away from the intake port 31 as it moves toward the rear side (-X side). As a result, as described above, the space 355 between the intake port 31 and the second filter section 362 can be widened, so that the air that flows into the housing 21 from the intake port 31 can easily pass through the second filter section 362. Therefore, the second airflow AF2 can easily pass through the second filter section 362 and flow into the rear air passage 52, thereby increasing the flow rate of the second airflow AF2 flowing through the rear air passage 52. As a result, the difference in flow rate between the first airflow AF1 passing through the front heat exchanger 42 and the second airflow AF2 passing through the rear heat exchanger 43 can be reduced, thus making the flow rates of the airflows AF1 and AF2 passing through the heat exchanger 41 more uniform. Therefore, the heat exchange efficiency between the heat exchanger 41 and the airflows AF1 and AF2 can be increased.

[0073] According to Embodiment 3, when viewed from a direction perpendicular to both the left-right direction (Y-axis direction), i.e., the front-back direction (X-axis direction), and the vertical direction, the second filter section 362 is a straight line extending from the lower vertical end of the first filter section 61 toward the rear (-X side). As shown in Figure 7, the second airflow AF2 flows upward as it passes through the second filter section 362. Therefore, it is easy to make the direction in which the surface of the second filter section 362 faces parallel to the direction in which the second airflow AF2 flows, thereby reducing the resistance of the second airflow AF2 as it passes through the second filter section 362. Thus, the flow rate of the second airflow AF2 that passes through the second filter section 362 and flows into the rear air passage 52 can be more effectively increased. This makes it possible to more effectively equalize the flow rates of the airflows AF1 and AF2 passing through the heat exchanger 41. Therefore, the heat exchange efficiency between the heat exchanger 41 and the airflows AF1 and AF2 can be more effectively increased. Therefore, the heating and cooling performance of the air conditioner 301 can be more effectively improved.

[0074] While embodiments of this disclosure have been described above, this disclosure is not limited to the configurations of the embodiments described above, and the following configurations and methods may also be adopted.

[0075] The first filter section and the second filter section may be separate components. The filter may also have a third filter section located between the first and second filter sections and connected to each of them. In this case, the third filter section may be located in the front air duct, in the rear air duct, or straddle both the front and rear air ducts.

[0076] Furthermore, the upper end of the front heat exchanger may be located below the axis of rotation or above the upper end of the opening.

[0077] The configurations and methods described herein can be combined as appropriate, provided they are not mutually inconsistent.

[0078] 1, 201, 301... Air conditioner, 20, 220, 320... Indoor unit, 21... Housing, 22... Housing body, 22c... Air outlet, 23a... Opening, 27... Rear wall section, 30... Front panel, 31... Intake port, 32... Front wall section, 41... Heat exchanger, 42... Front heat exchanger, 43... Rear heat exchanger, 45... Blower, 47... Drain pan, 50... Air passage, 51... Front air passage, 52... Rear air passage, 60, 260, 360... Filter, 61... First filter section, 62, 262, 362... Second filter section, J... Rotating shaft

Claims

1. An indoor unit for an air conditioner, and a floor-standing indoor unit, comprising: a heat exchanger; a blower that generates an airflow passing through the heat exchanger; a drain pan positioned vertically below the heat exchanger; an air passage through which the airflow passes; a filter positioned in the air passage; and a housing that accommodates the heat exchanger, the blower, the drain pan, and the filter, wherein the housing has a front wall portion positioned in front of the heat exchanger and the drain pan, a rear wall portion positioned behind the heat exchanger and the drain pan, an intake port provided in the portion of the front wall portion vertically below the blower, and an outlet provided vertically above the blower, wherein the heat exchanger has a front heat exchanger and a rear heat exchanger positioned behind the front heat exchanger, and the air passage is An indoor unit comprising: a front air passage, partly formed between the drain pan and the front wall, through which the airflow from the intake port toward the front heat exchanger flows; and a rear air passage, partly formed between the drain pan and the rear wall, through which the airflow from the intake port toward the rear heat exchanger flows; wherein the filter has a first filter section located in the front air passage and a second filter section located in the rear air passage, a part of the second filter section located vertically below the drain pan, the rear end of the second filter section in contact with the rear wall, and the second filter section moving away from the intake port toward the rear.

2. The indoor unit according to claim 1, wherein the housing comprises a housing body that houses the heat exchanger, the blower, the drain pan, and the filter, and a front panel that is detachably attached to the housing body, the housing body having an opening that opens to the front, the front panel closing the opening from the front, and in the vertical direction, the upper vertical end of the first filter portion is located vertically lower than the upper vertical end of the opening and vertically higher than the rotation axis of the blower.

3. The indoor unit according to claim 1 or 2, wherein, in the vertical direction, the rear end of the second filter section is located vertically below the drain pan.

4. The indoor unit according to any one of claims 1 to 3, wherein a portion of the filter is curved when viewed from a direction perpendicular to both the front-to-back direction and the vertical direction.

5. The indoor unit according to claim 4, wherein, when viewed from a direction perpendicular to both the front-to-back direction and the vertical direction, the first filter section is linear, the second filter section is curved, and the lower vertical end of the first filter section is connected to the front end of the second filter section.

6. The indoor unit according to any one of claims 1 to 3, wherein, when viewed from a direction perpendicular to both the front-to-back direction and the vertical direction, the second filter section is linear in shape and is located towards the rear as it is directed downward in the vertical direction.

7. The indoor unit according to any one of claims 1 to 3, wherein, when viewed from a direction perpendicular to both the front-to-back direction and the vertical direction, the second filter portion extends rearward from the lower vertical end of the first filter portion.

8. An air conditioner comprising an indoor unit according to any one of claims 1 to 7, and an outdoor unit connected to the indoor unit by a circulation path through which a refrigerant circulates.

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