Ceiling-embedded air conditioner

Abstract

This ceiling-embedded air conditioner comprises: a blower; a heat exchanger that performs heat exchange between air blown by the blower and a heat medium; a drain pan disposed below the heat exchanger; and a main body case that houses the blower, the heat exchanger, and the drain pan. The drain pan has: a gutter part that receives condensed water generated by the heat exchanger; and an accumulation part in which condensed water that flows out from the gutter part is stored as drain water. The accumulation part is disposed on one side of the heat exchanger in the left-right direction of the main body case. A blow-out port from which air that has passed through the heat exchanger is blown out is formed in the front surface of the main body case. A first maintenance cover is removably mounted adjacent to the blow-out port and in front of the accumulation part in the front-rear direction of the main body case.

Description

Ceiling-mounted air conditioning unit

[0001] The present disclosure relates to a ceiling-mounted air conditioning device.

[0002] Patent Document 1 describes an air conditioner that includes a heat exchanger, a drain pan that receives and stores condensed water generated by the heat exchanger, and a housing that houses the heat exchanger and the drain pan. An opening is formed in the side of the housing so that the drain pan can be inserted and removed.

[0003] Patent No. 6639159

[0004] According to the above air conditioning device, even if the air conditioning device is installed in an installation space where sufficient vertical dimensions cannot be secured, the drain pan can be inspected and cleaned by inserting and removing it through the opening on the side of the housing.

[0005] Inspection and cleaning of the drain pan in the above-mentioned air conditioning system is expected to be performed through a ceiling inspection hatch. However, there are cases where a ceiling inspection hatch is not provided due to reasons such as ceiling design. In such cases, there is a problem in that it becomes difficult to perform maintenance on the air conditioning system, such as inspecting the drain pan, after the air conditioning system has been installed.

[0006] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a ceiling-mounted air conditioner that can be easily maintained.

[0007] The ceiling-mounted air conditioning apparatus of the present disclosure comprises a blower, a heat exchanger that exchanges heat between the air blown by the blower and a heat medium, a drain pan arranged below the heat exchanger, and a main case that houses the blower, the heat exchanger, and the drain pan, wherein the drain pan has a gutter section that receives condensed water generated in the heat exchanger, and a collection section in which the condensed water that flows from the gutter section is collected as drain water, the collection section being arranged on one side of the main case in the left-right direction relative to the heat exchanger, an air outlet being formed on the front side of the main case through which air that has passed through the heat exchanger is blown out, and a first maintenance cover is removably attached adjacent to the air outlet on the front side of the collection section in the front-to-back direction of the main case.

[0008] According to the present disclosure, maintenance of a ceiling-mounted air conditioner can be easily performed.

[0009] 1 is a side view showing the installation status of a ceiling-embedded air conditioning apparatus according to Embodiment 1. FIG. 2 is a perspective view showing the configuration of a ceiling-embedded air conditioning apparatus according to Embodiment 1 as viewed from above. FIG. 3 is a perspective view showing the internal structure of a ceiling-embedded air conditioning apparatus according to Embodiment 1. FIG. 4 is a perspective view showing the configuration of a ceiling-embedded air conditioning apparatus according to Embodiment 1 as viewed from below. FIG. 5 is a top view showing the internal structure of a ceiling-embedded air conditioning apparatus according to Embodiment 1. FIG. 6 is an exploded perspective view showing the configuration of a drain pan and a bottom plate in a ceiling-embedded air conditioning apparatus according to Embodiment 1. FIG. 7 is an exploded perspective view showing the fitting structure between the bottom plate 14 and the partition plate 16 and the side plates 13 in a ceiling-embedded air conditioning apparatus according to Embodiment 1. FIG. 8 is a perspective view showing a state in which covers are removed from the ceiling-embedded air conditioning apparatus according to Embodiment 1. FIG. 9 is a perspective view showing a state in which the drain pan and the bottom plate are removed from the main body case in a ceiling-embedded air conditioning apparatus according to Embodiment 1.

[0010] Embodiments of the present disclosure will be described below with reference to the drawings. The present disclosure is not limited to the following embodiments and can be modified in various ways without departing from the spirit and scope of the present disclosure. Furthermore, the present disclosure includes all possible combinations of the configurations shown in the following embodiments. In particular, the combinations of components are not limited to those in each embodiment; components described in one embodiment can be applied to another embodiment. In the following description, directional terms (e.g., "up," "down," "right," "left," "front," "rear," etc.) are used as appropriate to facilitate understanding, but these are for explanatory purposes and do not limit the present disclosure. In each drawing, components designated with the same reference numerals are identical or equivalent, and this applies throughout the entire specification. Note that the relative dimensional relationships or shapes of each component in each drawing may differ from those in reality.

[0011] Embodiment 1. A ceiling-mounted air conditioning device according to embodiment 1 will be described. Fig. 1 is a side view showing the installation status of a ceiling-mounted air conditioning device according to this embodiment. In this embodiment, a ceiling-mounted indoor unit 1 is shown as an example of a ceiling-mounted air conditioning device.

[0012] As shown in Figure 1, the indoor unit 1 is installed inside the dropped ceiling 2, i.e., above the dropped ceiling 2. The indoor unit 1 is suspended from the beams of the building via a plurality of hanging bolts extending vertically. The dropped ceiling 2 is installed at a lower position than the interior ceiling 3. In this embodiment, for design reasons and the like, the dropped ceiling 2 is not provided with a ceiling inspection hatch.

[0013] A lowered wall surface 4 is provided at the step between the lowered ceiling 2 and the indoor ceiling 3. A lowered wall surface opening 5 is formed in the lowered wall surface 4. A grill 6 is provided in the lowered wall surface opening 5. The indoor unit 1 is disposed so as to face the grill 6.

[0014] As indicated by thick arrows A1 and A2, the indoor unit 1 takes in indoor air into the main body case 10 through the grill 6. The taken-in indoor air is cooled or heated by heat exchange with the heat medium. The cooled or heated air is then blown out of the main body case 10 through the grill 6 into the room, as indicated by thick arrows A3 and A4.

[0015] FIG. 2 is a perspective view showing the configuration of a ceiling-mounted air conditioner according to this embodiment, as viewed from above. FIG. 3 is a perspective view showing the internal structure of the ceiling-mounted air conditioner according to this embodiment. FIG. 4 is a perspective view showing the configuration of the ceiling-mounted air conditioner according to this embodiment, as viewed from below. FIG. 5 is a top view showing the internal structure of the ceiling-mounted air conditioner according to this embodiment. The left-right direction in FIG. 5 represents the left-right direction of the indoor unit 1 and the main body case 10. The up-down direction in FIG. 5 represents the front-rear direction of the indoor unit 1 and the main body case 10. The bottom of FIG. 5 represents the front side of the indoor unit 1 and the main body case 10, i.e., the grill 6 side. The top of FIG. 5 represents the rear side of the indoor unit 1 and the main body case 10. The direction perpendicular to the plane of the paper in FIG. 5 represents the vertical up-down direction.

[0016] 2 to 5, the indoor unit 1 has a main body case 10 and a bottom plate 14 that is detachably attached to the bottom of the main body case 10. Four hanging fittings 17 are provided on the outside of the main body case 10. Two hanging fittings 17 are provided on each of the left and right sides of the main body case 10. The main body case 10 is suspended within the dropped ceiling 2 by hanging bolts connected to each hanging fitting 17.

[0017] The main body case 10 is made of sheet metal and has a rectangular parallelepiped shape. The main body case 10 has a top plate 11, one side plate 12, and the other side plate 13. The main body case 10 houses a heat exchanger 20, a blower 30, a drain pan 40, a drain pump 41, a control box 50, etc.

[0018] An air outlet 15 is formed on one side of the main body case 10. Hereinafter, the side on which the air outlet 15 is formed may be referred to as the front side of the main body case 10. The air outlet 15 is formed in a rectangular shape extending along the left-right direction of the indoor unit 1. The main body case 10 is positioned so that the air outlet 15 faces downwardly the wall opening 5 and the grill 6.

[0019] A first maintenance cover 61 and a second maintenance cover 62 are provided on the front surface of the main body case 10. The first maintenance cover 61 and the second maintenance cover 62 are each detachably attached to the main body case 10. Both the first maintenance cover 61 and the second maintenance cover 62 are provided adjacent to the air outlet 15. The first maintenance cover 61 is disposed on one side of the air outlet 15, for example, on the right side. The second maintenance cover 62 is disposed below the air outlet 15. Both the first maintenance cover 61 and the second maintenance cover 62 are disposed so as to face the downward wall opening 5 and the grill 6.

[0020] The interior of the main body case 10 is divided by a partition plate 16. The partition plate 16 is disposed perpendicular to the air outlet 15 in the top view shown in Fig. 5 . As a result, the interior of the main body case 10 is divided into two spaces, left and right, by the partition plate 16. In the top view, the air outlet 15 and the heat exchanger 20 are provided to the right of the partition plate 16.

[0021] A blower 30 is provided in the space inside the main body case 10 to the left of the partition plate 16. When viewed from above, the blower 30 is positioned to the left of the air outlet 15 and the heat exchanger 20. In other words, when viewed from the front side of the main body case 10, the blower 30 is positioned so as not to overlap with the air outlet 15 and the heat exchanger 20.

[0022] The blower 30 is a sirocco fan equipped with an impeller 31, a motor 33, and a spiral-shaped fan casing 32 that houses these components. The rotation shaft 31a of the impeller 31 extends in the vertical direction. An intake opening 32a is formed on the underside of the fan casing 32. The intake opening 32a is circular and centered on the rotation shaft 31a. A bottom opening 10a is formed on the bottom surface of the main body case 10, below the fan casing 32. As a result, air within the dropped ceiling 2 is drawn into the fan casing 32 via the bottom opening 10a and the intake opening 32a.

[0023] An outlet opening 32b facing the tangent direction of the spiral is formed on the outer periphery of the fan casing 32. The fan casing 32 is positioned so that the outlet opening 32b faces the left-right direction of the indoor unit 1.

[0024] An air blowing opening 16a is formed in the partition plate 16. An air blowing opening 32b of the fan casing 32 is connected to the air blowing opening 16a. As a result, air drawn into the fan casing 32 is blown out in the left-right direction of the indoor unit 1 through the air blowing opening 32b and the air blowing opening 16a, and flows into the space to the right of the partition plate 16.

[0025] A heat exchanger 20 is provided in the space to the right of the partition plate 16. The heat exchanger 20 is disposed downstream of the blower 30 in the flow of air blown by the blower 30. The heat exchanger 20 is configured to exchange heat between the blown air and a heat medium. The heat exchanger 20, together with a compressor, an outdoor heat exchanger, and an expansion valve (not shown), constitutes a refrigeration cycle. A refrigerant circulating through the refrigeration cycle flows inside the heat exchanger 20 as a heat medium.

[0026] The heat exchanger 20 is arranged along the left-right direction of the indoor unit 1 when viewed from above. The heat exchanger 20 is also arranged along the air outlet 15 when viewed from above the indoor unit 1. When viewed along the front-to-rear direction of the indoor unit 1, the heat exchanger 20 is arranged so as to overlap with the air outlet 15 but not overlap with the blower 30. The heat exchanger 20 has a V-shaped cross section that is open upwind in a cross section cut parallel to both the front-to-rear direction and the vertical direction of the indoor unit 1.

[0027] The heat exchanger 20 is disposed perpendicular to the air outlet 16a when viewed from above the indoor unit 1. A partition wall 18 that forms an air passage is provided inside the main body case 10. The air passage between the air outlet 16a and the heat exchanger 20 is bent by the partition wall 18. The partition wall 18 is formed into a smoothly curved surface. The partition wall 18 is formed by internal insulation material 19 provided inside the main body case 10.

[0028] The air blown out from the fan casing 32 in the left-right direction of the indoor unit 1 is guided by the partition wall 18. The partition wall 18 changes the flow direction of the air from the left-right direction of the indoor unit 1 to the front-rear direction of the indoor unit 1. The air then passes through the heat exchanger 20 and is blown out from the air outlet 15.

[0029] A pipe 21 through which a refrigerant flows is connected to the heat exchanger 20. A pipe sensor 22 is provided on the pipe 21. The pipe sensor 22 is configured to detect the state of the refrigerant, for example, the temperature of the refrigerant. In a top view, the pipe 21 and the pipe sensor 22 are disposed in a position shifted to the right of the heat exchanger 20.

[0030] A control box 50 is provided in the main body case 10 on the front side of the blower 30. The control box 50 houses control devices that control the functional components of the indoor unit 1. A lid 51 is detachably attached to the front side of the control box 50. The lid 51 is positioned so as to face the downward wall opening 5 and the grill 6.

[0031] The drain pan 40 is disposed below the heat exchanger 20. The drain pan 40 is held from below by the bottom plate 14.

[0032] Figure 6 is an exploded perspective view showing the configuration of the drain pan and bottom plate in a ceiling-mounted air conditioner according to this embodiment. As shown in Figure 6, the drain pan 40 has a gutter portion 40a and a collection portion 40b. The gutter portion 40a is formed directly below the lower end of the heat exchanger 20. The gutter portion 40a extends in a groove-like shape along the left-right direction of the main body case 10. The gutter portion 40a is configured to receive condensed water generated in the heat exchanger 20 and direct it to the collection portion 40b.

[0033] The accumulation portion 40b is configured to collect condensed water flowing from the gutter portion 40a as drain water. The accumulation portion 40b is formed in a groove shape that is deeper than the gutter portion 40a. The accumulation portion 40b extends along the front-to-rear direction of the main body case 10. In a top view, the accumulation portion 40b is positioned offset to the right with respect to the heat exchanger 20. In other words, the accumulation portion 40b is positioned offset to the opposite side of the blower 30 with respect to the heat exchanger 20. In a top view, a first maintenance cover 61 is attached to the front side of the accumulation portion 40b.

[0034] A pipe-shaped drain outlet 43 is provided at the deepest part of the accumulation section 40b to discharge the drain water in the accumulation section 40b to the outside. The drain outlet 43 is located at the right end of the indoor unit 1. During normal use of the indoor unit 1, a drain outlet cover 43a is attached to the drain outlet 43.

[0035] The drain pump 41 is provided in the collecting section 40b. The drain pump 41 is configured to discharge the drain water accumulated in the collecting section 40b. As a result, the drain water accumulated in the collecting section 40b is discharged by the drain pump 41 through the pump drain port 42 to the outside of the main body case 10. The operation of the drain pump 41 is controlled based on the water level of the drain water in the collecting section 40b using, for example, a float switch or the like.

[0036] A groove 44 is formed on the front surface of the drain pan 40. The groove 44 is recessed rearward in the front-rear direction of the indoor unit 1. The groove 44 extends left-right in the indoor unit 1. The groove 44 houses wiring and the like for the piping sensor 22. The wiring for the piping sensor 22 passes through the groove 44 and is connected to the control equipment in the control box 50. A sealant 45 is provided on the surface of the top surface of the drain pan 40 that comes into contact with the internal insulation material 19.

[0037] The bottom plate 14 has four raised sides to accommodate the drain pan 40. Of the four sides of the bottom plate 14, a raised portion 14a is formed on the right side in the left-right direction of the indoor unit 1, i.e., the side on the drain side. The raised portion 14a is formed with a drain outlet hole 46 through which the drain outlet 43 passes, a screw hole 47 for fastening to the side plate 13, and a bend 48 that can be hooked onto the square hole 13a of the side plate 13.

[0038] Of the four sides of the bottom plate 14, an offset bent portion 14b is formed on the left side in the left-right direction of the indoor unit 1, i.e., the side opposite the drainage side. A square hole 49 is formed in the offset bent portion 14b so that it can be hooked onto the partition plate 16. The square hole 49 is an example of a hooking structure.

[0039] When the drain pan 40 is attached to the bottom plate 14, the drain outlet 43 is inserted into the drain outlet hole 46. This makes the drain pan 40 integrated with the bottom plate 14. When the bottom plate 14 is removed from the main body case 10 during maintenance of the indoor unit 1, the drain pan 40 is also removed from the main body case 10 together with the bottom plate 14.

[0040] 7 is an exploded perspective view showing the fitting structure between the bottom plate 14, the partition plate 16, and the side plate 13 in a ceiling-mounted air conditioning unit according to this embodiment. As shown in FIG. 7, the bend 16c formed in the bottom surface 16b of the partition plate 16 is passed through the square hole 49 in the bottom plate 14. As a result, the hooking structure of the bottom plate 14 is hooked onto the partition plate 16. The offset bent portion 14b is supported by the bottom surface 16b of the partition plate 16.

[0041] On the other hand, on the opposite side, the bend 48 is hooked into the square hole 13a formed in the side plate 13, so that the bottom plate 14 is temporarily held to the side plate 13. In this state, the bottom plate 14 is fixed to the side plate 13 by a screw passed through the screw hole 47.

[0042] The sealing material 45 of the drain pan 40 comes into contact with and is compressed by the internal insulating material 19. This secures the bottom plate 14 to the main body case 10 without loosening and without causing air leakage. With this configuration, the bottom plate 14 and the drain pan 40 can be attached to and detached from the main body case 10 from the front side through the downward wall opening 5.

[0043] Next, we will explain the procedure for maintaining the indoor unit 1. In this embodiment, it is assumed that maintenance will be performed from the front side of the main body case 10 by an operator inserting their hand through the downward wall opening 5 with the grill 6 removed. Figure 8 is a perspective view showing the ceiling-mounted air conditioner according to this embodiment with the covers removed.

[0044] As shown in Figure 8, the first maintenance cover 61, the second maintenance cover 62, and the lid 51 are detachably attached to the main body case 10 with screws. These screws can be removed from the front side of the main body case 10 through the downward wall opening 5. Therefore, the first maintenance cover 61, the second maintenance cover 62, and the lid 51 can be removed from the front side of the main body case 10 through the downward wall opening 5. A portion of the first maintenance cover 61 overlaps the front side of the second maintenance cover 62. A portion of the lid 51 overlaps the front side of the second maintenance cover 62.

[0045] The first maintenance cover 61 is attached to the top plate 11 and the second maintenance cover 62 with screws. By removing these screws, the first maintenance cover 61 can be removed from the main body case 10. When the first maintenance cover 61 is removed, the collecting section 40b of the drain pan 40 can be seen from the front side of the main body case 10. This allows the worker to inspect the degree of dirt in the collecting section 40b from the front side of the main body case 10. Furthermore, when the first maintenance cover 61 is removed, the pipe sensor 22 provided on the pipe 21 is exposed. This allows the worker to perform maintenance on the pipe sensor 22 from the front side of the main body case 10.

[0046] When replacing the piping sensor 22, the screws that secure the lid 51 to the control box 50 and the screws that secure the second maintenance cover 62 to the partition plate 16 are further removed. This allows the lid 51 and the second maintenance cover 62 to be removed from the main body case 10. Once the lid 51 and the second maintenance cover 62 are removed, the wiring connecting the piping sensor 22 to the control box 50 can be removed, making it possible to easily replace the piping sensor 22.

[0047] 9 is a perspective view showing the state in which the drain pan 40 and bottom plate 14 have been removed from the main body case 10 in the ceiling-mounted air conditioner according to this embodiment. As shown in FIG. 9, the drain pan 40 and bottom plate 14 removed from the main body case 10 are held in the main body case 10 in an inclined state with the drain side facing downwards.

[0048] After the cooling operation of the indoor unit 1 stops, the condensed water remaining on the surface of the heat exchanger 20 gradually collects in the accumulation section 40b, and the water in the rising portion of the drain pipe between the drain pump 41 and the pump drain outlet 42 flows out of the drain pump 41 and returns to the accumulation section 40b. Therefore, when cleaning the drain pan 40, drain water remains in the accumulation section 40b. Therefore, before removing the drain pan 40, it is necessary to tilt the drain pan 40 toward the drain side in order to drain the drain water in the accumulation section 40b through the drain outlet 43.

[0049] In this embodiment, the edge of the bottom plate 14 on the opposite side to the drainage side is hooked to the partition plate 16 of the main body case 10 by a hook structure. Therefore, when the screws fastening the bottom plate 14 to the side plate 13 are removed and the bend 48 of the bottom plate 14 is pulled out of the square hole 13a of the side plate 13, the drain pan 40 and bottom plate 14 are held in an inclined position with the drainage side facing downwards. Therefore, drain water remaining in the accumulation portion 40b is drained through the drain outlet 43. After the drain water has been drained, the opposite side of the drain pan 40 and bottom plate 14 is lifted and the bend 16c is pulled out of the square hole 49. This releases the hook structure, allowing the drain pan 40 and bottom plate 14 to be completely removed from the main body case 10, making cleaning the drain pan 40 easy.

[0050] Fig. 10 is a perspective view showing a ceiling-mounted air conditioner according to a modified example of the present embodiment with the drain pan and bottom plate removed from the main case. As shown in Fig. 10, in this modified example, the drain outlet 43 is provided on the front side of the main case 10. Of the four sides of the bottom plate 14, a hook structure (not shown) is provided on the rear side in the fore-and-aft direction of the indoor unit 1, i.e., the side opposite the drainage side. The hook structure of the bottom plate 14 is hooked onto the main case 10. In this modified example, when the bottom plate 14 is released from its attachment to the main case 10, the drain pan 40 and bottom plate 14 are held in an inclined position with their front sides facing downwards.

[0051] As described above, the ceiling-mounted air conditioning system according to this embodiment includes the blower 30, the heat exchanger 20, the drain pan 40, and the main body case 10. The heat exchanger 20 is configured to exchange heat between the air blown by the blower 30 and the heat medium. The drain pan 40 is disposed below the heat exchanger 20. The main body case 10 houses the blower 30, the heat exchanger 20, and the drain pan 40.

[0052] The drain pan 40 has a gutter 40a that receives condensed water generated in the heat exchanger 20 and a collection section 40b that collects the condensed water that flows from the gutter 40a as drain water. The collection section 40b is disposed on one side of the main body case 10 in the left-right direction relative to the heat exchanger 20.

[0053] An air outlet 15 is formed on the front surface of the main body case 10, through which air that has passed through the heat exchanger 20 is blown out. A first maintenance cover 61 is detachably attached adjacent to the air outlet 15 on the front side of the accumulation section 40b in the front-rear direction of the main body case 10.

[0054] With this configuration, by removing the first maintenance cover 61 from the main body case 10, the accumulation section 40b of the drain pan 40 can be seen from the front side of the main body case 10. Therefore, even if a ceiling inspection hatch is not provided, an operator can easily inspect the drain pan 40 from the front side of the main body case 10 through the lowered wall opening 5. Therefore, with this configuration, maintenance of the ceiling-mounted air conditioner can be easily performed.

[0055] In the ceiling-mounted air conditioning system according to this embodiment, a pipe 21 through which a heat medium flows is connected to a heat exchanger 20. A pipe sensor 22 that detects the state of the heat medium is provided in the pipe 21. The pipe sensor 22 is disposed on the one side of the heat exchanger 20.

[0056] According to this configuration, by removing the first maintenance cover 61 from the main body case 10, the piping sensor 22 can be exposed on the front side of the main body case 10. Therefore, an operator can perform maintenance on the piping sensor 22 from the front side of the main body case 10 through the downward wall opening 5.

[0057] In the ceiling-mounted air conditioner according to this embodiment, a second maintenance cover 62 is detachably attached to the front of the main body case 10, adjacent to the lower side of the air outlet 15. The second maintenance cover 62 covers the front of the drain pan 40. A groove 44 is formed in the front of the drain pan 40, through which the wiring of the piping sensor 22 passes.

[0058] According to this configuration, by removing the first maintenance cover 61 and the second maintenance cover 62 from the main body case 10, the pipe sensor 22 can be easily replaced together with the wiring.

[0059] The ceiling-mounted air conditioner according to this embodiment further includes a bottom plate 14. The bottom plate 14 is detachably attached to the bottom of the main body case 10. The bottom plate 14 holds the drain pan 40 from below.

[0060] According to this configuration, when the bottom plate 14 is removed from the main body case 10, the drain pan 40 can also be removed from the main body case 10 together with the bottom plate 14.

[0061] In the ceiling-mounted air conditioner according to this embodiment, the drain pan 40 is provided with a drain outlet 43 for discharging drain water in the accumulation section 40b to the outside. The bottom plate 14 has a square hole 49 at the end opposite the drain outlet 43 in top view, which can be hooked onto the main body case 10. The square hole 49 is an example of a hooking structure.

[0062] With this configuration, the drain pan 40 and the bottom plate 14 are held in the main body case 10 in an inclined state with the drain outlet 43 facing downwards. Therefore, during maintenance, drain water remaining in the accumulation section 40b can be easily drained through the drain outlet 43.

[0063] In the ceiling-mounted air conditioner according to this embodiment, the drain outlet 43 is provided on the front side of the bottom plate 14 in the front-to-rear direction of the main body case 10. The hook structure of the bottom plate 14 is provided on the rear end of the bottom plate 14 in the front-to-rear direction of the main body case 10.

[0064] With this configuration, the drain pan 40 and the bottom plate 14 are held in the main body case 10 in a tilted state with the front side facing downwards. Therefore, not only can the drain water remaining in the accumulation portion 40b be easily drained from the drain outlet 43, but maintenance of the drain pan 40 can also be easily performed from the front side.

[0065] In the ceiling-mounted air conditioner according to this embodiment, the blower 30 is disposed on the other left-right side of the main body case 10 relative to the heat exchanger 20. This configuration allows the ceiling-mounted air conditioner to be made smaller in both the up-down and front-to-back directions of the main body case 10.

[0066] 1 Indoor unit, 2 Dropped ceiling, 3 Indoor ceiling, 4 Dropped wall, 5 Dropped wall opening, 6 Grill, 10 Main body case, 10a Bottom opening, 11 Top plate, 12 Side plate, 13 Side plate, 13a Square hole, 14 Bottom plate, 14a Rising portion, 14b Offset bend portion, 15 Air outlet, 16 Partition plate, 16a Air outlet, 16b Bottom, 16c Bending, 17 Hanging hardware, 18 Partition wall, 19 Internal insulation material, 20 Heat exchanger, 21 Piping, 22 Piping sensor, 30 Blower, 31 Impeller, 31a Rotating shaft, 32 Fan casing, 32a Intake opening, 32b Outlet opening, 33 Motor, 40 Drain pan, 40a Gutter portion, 40b Accumulation portion, 41 Drain pump, 42 Pump drain outlet, 43 drain outlet, 43a drain outlet cover, 44 groove, 45 sealant, 46 drain outlet hole, 47 screw hole, 48 bend, 49 square hole, 50 control box, 51 cover, 61 first maintenance cover, 62 second maintenance cover.

Claims

1. An in-ceiling air conditioner comprising a blower, a heat exchanger that exchanges heat between air blown by the blower and a heat medium, a drain pan disposed below the heat exchanger, and a main body case that houses the blower, the heat exchanger, and the drain pan. The drain pan has a trough portion that receives condensed water generated in the heat exchanger, and an accumulation portion where the condensed water flowing from the trough portion is stored as drain water. The accumulation portion is disposed on one side in the left-right direction of the main body case with respect to the heat exchanger. An air outlet through which air that has passed through the heat exchanger is blown is formed on the front surface of the main body case. A first maintenance cover is detachably attached adjacent to the air outlet on the front side of the accumulation portion in the front-rear direction of the main body case.

2. A piping through which the heat medium flows is connected to the heat exchanger, and a piping sensor for detecting the state of the heat medium is provided in the piping. The piping sensor is disposed on the one side with respect to the heat exchanger. The in-ceiling air conditioner according to claim 1.

3. A second maintenance cover is detachably attached adjacent to the lower side of the air outlet on the front surface of the main body case. The second maintenance cover covers the front surface of the drain pan. A groove through which the wiring of the piping sensor passes is formed on the front surface of the drain pan. The in-ceiling air conditioner according to claim 2.

4. The in-ceiling air conditioner according to any one of claims 1 to 3, further comprising a bottom plate detachably attached to the bottom of the main body case and holding the drain pan from below.

5. The drain pan is provided with a drain port for discharging the drain water in the accumulation portion to the outside. The bottom plate has a hooking structure that is hooked on the main body case at an end on the side opposite to the drain port in a top view. The in-ceiling air conditioner according to claim 4.

6. The drain port is provided on the front side of the bottom plate in the front-rear direction, and the hooking structure is provided at an end on the rear side of the bottom plate in the front-rear direction. The in-ceiling air conditioner according to claim 5.

7. The ceiling-embedded air conditioner according to any one of claims 1 to 6, wherein the blower is disposed on the other side in the left-right direction with respect to the heat exchanger.

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