Patent Publication Number: US-11029060-B2

Title: Air-conditioning apparatus

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is a U.S. national stage application of PCT/JP2014/074723 filed on Sep. 18, 2014, the contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The present invention relates to air-conditioning apparatuses. 
     BACKGROUND ART 
     There is a conventional air-conditioning apparatus that includes, for example, a main body having an air passage formed therein, and a pair of heat exchangers provided adjacent to each other in a V-shape in the air passage. By arranging the pair of heat exchangers adjacent to each other in a V-shape, the main body can be made compact. The main body is disposed in such an orientation that an air flow generated in the air passage passes horizontally through the pair of heat exchangers. Furthermore, the pair of heat exchangers are provided adjacent to each other, symmetrically with respect to the horizontal plane. A drain pan is disposed below the pair of heat exchangers (for example, see Patent Literature 1). 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: The Description of U.S. Pat. No. 4,000,779 (column 2, line 36 to column 5, line 37, and FIGS. 1 to 4) 
     SUMMARY OF INVENTION 
     Technical Problem 
     In such an air-conditioning apparatus, both of the condensate water generated in the heat exchanger located on the upper side and the condensate water generated in the heat exchanger located on the lower side gather at the lower end portion of the heat exchanger located on the lower side, and a large quantity of condensate water drops on the drain pan from the lower end portion. Hence, there has been a problem in that the condensate water is spattered outside the drain pan, causing water leakage or other problems. Furthermore, in order to prevent condensate water dropping from the lower end portion of the heat exchanger located on the upper side from splashing at the drain pan and being spattered outside the drain pan, a condensate guide is disposed on the downstream side of the lower end portion of the heat exchanger located on the upper side. However, because a drain port in the guide condensate is formed on the upstream side of a condensate-water receiving portion in a direction of the air flow; and the condensate water is required to flow against the air flow, which leads to a problem in that the drainage efficiency of the condensate water dropping on the guide plate is low. 
     The present invention has been made in view of the above-described problems, and provides an air-conditioning apparatus in which spattering of condensate water to the outside of a drain pan is suppressed and in which the condensate-water drainage efficiency is improved. 
     Solution to Problem 
     An air-conditioning apparatus according to an embodiment of the present invention includes: a main body having an air passage formed therein; and a heat-exchange unit disposed in the air passage. The heat-exchange unit includes a first heat exchanger and a second heat exchanger provided adjacent to each other; and a partition plate disposed in such a state that a first region located inside a space between the first heat exchanger and the second heat exchanger and a second region located outside the space are formed. In a first disposition state, the main body is disposed in such an orientation that an air flow generated in the air passage passes through the heat-exchange unit in a direction intersecting the direction of gravity. In the first disposition state, the heat-exchange unit is disposed in such an orientation that the first heat exchanger is provided adjacent to and above the second heat exchanger and that the second region of the partition plate is located on the downstream side of the first region. The second region of the partition plate is provided with an inlet of a drain path communicating with the outside of the main body. 
     Advantageous Effects of Invention 
     In the air-conditioning apparatus according to an embodiment of the present invention, because the condensate water generated in the first heat exchanger provided adjacent to and above the second heat exchanger can be discharged to the outside of the main body from the inlet of a drain path formed in the second region of the partition plate, which is located on the outside of the space between the first heat exchanger and the second heat exchanger, it is possible to inhibit a large quantity of condensate water from dropping on a drain pan and being spattered outside a drain pan from the lower end portion of the second heat exchanger. Furthermore, because the condensate water is guided to the inlet of a drain path by using the air flow, the condensate-water drainage efficiency is improved. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view of an air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented upward. 
         FIG. 2  is a sectional view of the air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented upward. 
         FIG. 3  is a perspective view of the air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented downward. 
         FIG. 4  is a sectional view of the air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented downward. 
         FIG. 5  is a perspective view of the air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented rightward, 
         FIG. 6  is a sectional view of the air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented rightward. 
         FIG. 7  is a perspective view of the air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented leftward. 
         FIG. 8  is a sectional view of the air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented leftward. 
         FIG. 9  is a perspective view of a heat-exchange unit of the air-conditioning apparatus according to Embodiment 1 of the present invention. 
         FIG. 10  is a sectional view of the heat-exchange unit of the air-conditioning apparatus according to Embodiment 1 of the present invention. 
         FIG. 11  is an exploded perspective view of a portion of the heat-exchange unit of the air-conditioning apparatus according to Embodiment 1 of the present invention. 
         FIG. 12  is a sectional view of a portion of the heat-exchange unit of the air-conditioning apparatus according to Embodiment 1 of the present invention. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     An air-conditioning apparatus of the present invention will be described below by using drawings. 
     Note that the configurations and the like described below are merely examples, and the air-conditioning apparatus of the present invention is not limited to one having such configurations and the like. Furthermore, detailed descriptions of the configurations and the like are simplified or omitted, as appropriate. Furthermore, overlapping or similar descriptions are simplified or omitted, as appropriate. 
     Embodiment 1 
     An air-conditioning apparatus according to Embodiment 1 will be described. 
     Overall Configuration of Air-Conditioning Apparatus 
     First, the overall configuration of an air-conditioning apparatus according to Embodiment 1 will be described. 
     Disposition State in Which Air-Blowing Direction is Oriented Upward 
       FIG. 1  is a perspective view of an air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented upward.  FIG. 2  is a sectional view of the air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented upward. Note that, in  FIGS. 1 and 2 , air flows are shown by fill-in arrows. The disposition state in which the air-blowing direction is oriented upward is a normally used disposition state. In other words, when an air-conditioning apparatus  1  is installed, the air-blowing direction can be changed according to the use environment at the installation site. 
     As shown in  FIGS. 1 and 2 , the air-conditioning apparatus  1  includes a main body  11  and a heat-exchange unit  21 . The main body  11  includes a housing  12  having an air passage  12   a  formed therein, and a fan  13  disposed in the air passage  12   a , When the fan  13  is driven, an air flow flowing into the air passage  12   a  from an air inlet  12   b  provided at one longitudinal end of the housing  12  and flowing out from an air outlet  12   c  provided at the other longitudinal end of the housing  12  is generated. 
     The heat-exchange unit  21  is disposed on the downstream side of the fan  13  in the air passage  12   a . In other words, the main body  11  is disposed in such an orientation that the air flow generated in the air passage  12   a  passes through the heat-exchange unit  21  in the direction opposite to the direction of gravity. 
     The heat-exchange unit  21  includes a pair of heat exchangers  22  and  23  provided adjacent to each other in a V-shape, a first main drain pan  24 , and a second main drain pan  25 . The heat-exchange unit  21  is integrally attached to and removed from the main body  11 . The configuration of the heat-exchange unit  21  will be described in detail below. 
     The heat-exchange unit  21  is disposed in such an orientation that an end  22   a  of the heat exchanger  22  closer to the heat exchanger  23  and an end  23   a  of the heat exchanger  23  closer to the heat exchanger  22  are oriented toward the downstream side, that is, upward. Specifically, the heat exchanger  22  and the heat exchanger  23  are provided adjacent to each other, symmetrically with respect to a vertical plane Pv, and a space S between the heat exchanger  22  and the heat exchanger  23  is gradually narrowed toward the upper side. Furthermore, the first main drain pan  24  is located below the heat exchanger  22  and the heat exchanger  23 . 
     The air flow generated in the air passage  12   a  is cooled or heated by passing through the space S between the heat exchanger  22  and the heat exchanger  23  and then passing through the heat exchanger  22  and the heat exchanger  23 . The condensate water generated in the heat exchanger  22  and the heat exchanger  23  flows into the first main drain pan  24  and is discharged to the outside of the main body  11  from the first main drain pan  24 . 
     Disposition State in Which Air-Blowing Direction is Oriented Downward 
       FIG. 3  is a perspective view of the air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented downward.  FIG. 4  is a sectional view of the air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented downward. Note that, in  FIGS. 3 and 4 , air flows are shown by fill-in arrows. 
     As shown in  FIGS. 3 and 4 , the heat-exchange unit  21  is disposed on the downstream side of the fan  13  in the air passage  12   a . In other words, the main body  11  is disposed in such an orientation that the air flow generated in the air passage  12   a  passes through the heat-exchange unit  21  in the direction of gravity. 
     The heat-exchange unit  21  is disposed in such an orientation that the end  22   a  of the heat exchanger  22  closer to the heat exchanger  23  and the end  23   a  of the heat exchanger  23  closer to the heat exchanger  22  are oriented toward the upstream side, that is, upward. Specifically, the heat exchanger  22  and the heat exchanger  23  are provided adjacent to each other, symmetrically with respect to the vertical plane Pv, and the space S between the heat exchanger  22  and the heat exchanger  23  is gradually narrowed toward the upper side. Furthermore, the first main drain pan  24  is located below the heat exchanger  22  and the heat exchanger  23 . 
     When the disposition state is changed from a disposition state in which the air-blowing direction is oriented upward to a disposition state in which the air-blowing direction is oriented downward, the heat-exchange unit  21  is removed, the main body  11  turned upside down, and then the heat-exchange unit  21  is disposed in the same orientation as it was in before removal. 
     The air flow generated in the air passage  12   a  passes through the heat exchanger  22  and the heat exchanger  23  to be cooled or heated and then passes through the space S between the heat exchanger  22  and the heat exchanger  23 . The condensate water generated in the heat exchanger  22  and the heat exchanger  23  flows into the first main drain pan  24  and is discharged to the outside of the main body  11  from the first main drain pan  24 . 
     Disposition State in Which Air-Blowing Direction is Oriented Rightward 
       FIG. 5  is a perspective view of the air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented rightward,  FIG. 6  is a sectional view of the air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented rightward. Note that, in  FIGS. 5 and 6 , air flows are shown by fill-in arrows. The disposition state in which the air-blowing direction is oriented rightward corresponds to a “first disposition state” of the present invention. 
     As shown in  FIGS. 5 and 6 , the heat-exchange unit  21  is disposed on the downstream side of the fan  13  in the air passage  12   a . In other words, the main body  11  is disposed in such an orientation that the air flow generated in the air passage  12   a  passes horizontally through the heat-exchange unit  21 . 
     The heat-exchange unit  21  is disposed in such an orientation that the heat exchanger  22  is arranged adjacent to and above the heat exchanger  23  and in which the end  22   a  of the heat exchanger  22  closer to the heat exchanger  23  and the end  23   a  of the heat exchanger  23  closer to the heat exchanger  22  are oriented toward the downstream side, that is, rightward, Specifically, the heat exchanger  22  and the heat exchanger  23  are provided adjacent to each other, symmetrically with respect to a horizontal plane Ph, and the space S between the heat exchanger  22  and the heat exchanger  23  is gradually narrowed toward the right side. Furthermore, the second main drain pan  25  is located below the heat exchanger  22  and the heat exchanger  23 . The heat exchanger  22  corresponds to a “first heat exchanger” of the present invention, and the heat exchanger  23  corresponds to a “second heat exchanger” of the present invention. The end  22   a  corresponds to a “first end” of the present invention, and the end  23   a  corresponds to a “second end” of the present invention. 
     When the disposition state is changed from a disposition state in which the air-blowing direction is oriented upward to a disposition state in which the air-blowing direction is oriented rightward, the main body  11  is rotated in the direction in which the right-side surface is located on the lower side, from the state shown in  FIGS. 1 and 2 . 
     The air flow generated in the air passage  12   a  passes through the space S between the heat exchanger  22  and the heat exchanger  23  and then passes through the heat exchanger  22  and the heat exchanger  23  to be cooled or heated. The condensate water generated in the heat exchanger  22  and the heat exchanger  23  flows into the second main drain pan  25  and is discharged to the outside of the main body  11  from the second main drain pan  25 . 
     Disposition State in Which Air-Blowing Direction is Oriented Leftward 
       FIG. 7  is a perspective view of the air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented leftward.  FIG. 8  is a sectional view of the air-conditioning apparatus according to Embodiment 1 of the present invention, in a disposition state in which the air-blowing direction is oriented leftward. Note that, in  FIGS. 7 and 8 , air flows are shown by fill-in arrows. The disposition state in which the air-blowing direction is oriented leftward corresponds to the “first disposition state” of the present invention. 
     As shown in  FIGS. 7 and 8 , the heat-exchange unit  21  is disposed on the downstream side of the fan  13  in the air passage  12   a , In other words, the main body  11  is disposed in such an orientation that the air flow generated in the air passage  12   a  passes horizontally through the heat-exchange unit  21 . 
     The heat-exchange unit  21  is disposed in such an orientation that the heat exchanger  23  is arranged adjacent to and above the heat exchanger  22  and in which the end  22   a  of the heat exchanger  22  closer to the heat exchanger  23  and the end  23   a  of the heat exchanger  23  closer to the heat exchanger  22  are oriented toward the downstream side, that is, leftward, Specifically, the heat exchanger  22  and the heat exchanger  23  are provided adjacent to each other, symmetrically with respect to the horizontal plane Ph, and the space S between the heat exchanger  22  and the heat exchanger  23  is gradually narrowed toward the left side. Furthermore, the second main drain pan  25  is located below the heat exchanger  22  and the heat exchanger  23 . The heat exchanger  23  corresponds to the “first heat exchanger” of the present invention, and the heat exchanger  22  corresponds to the “second heat exchanger” of the present invention. The end  23   a  corresponds to the “first end” of the present invention, and the end  22   a  corresponds to the “second end” of the present invention. 
     When the disposition state is changed from a disposition state in which the air-blowing direction is oriented upward to a disposition state in which the air-blowing direction is oriented leftward, the main body  11  is rotated in the direction in which the left side surface is located on the lower side, from the state shown in  FIGS. 1 and 2 . Then, the heat-exchange unit  21  is removed, the second main drain pan  25  attached above the heat exchanger  23  is reattached below the heat exchanger  22 , and then the heat-exchange unit  21  is disposed in the same orientation as it was in before removal. 
     The air flow generated in the air passage  12   a  passes through the space S between the heat exchanger  22  and the heat exchanger  23  and then passes through the heat exchanger  22  and the heat exchanger  23  to be cooled or heated. The condensate water generated in the heat exchanger  22  and the heat exchanger  23  flows into the second main drain pan  25  and is discharged to the outside of the main body  11  from the second main drain pan  25 . 
     Configuration of Heat-Exchange Unit 
     Next, the configuration of the heat-exchange unit of the air-conditioning apparatus according to Embodiment 1 will be described. 
       FIG. 9  is a perspective view of the heat-exchange unit of the air-conditioning apparatus according to Embodiment 1 of the present invention.  FIG. 10  is a sectional view of the heat-exchange unit of the air-conditioning apparatus according to Embodiment 1 of the present invention.  FIG. 11  is an exploded perspective view of a portion of the heat-exchange unit of the air-conditioning apparatus according to Embodiment 1 of the present invention.  FIG. 12  is a sectional view of a portion of the heat-exchange unit of the air-conditioning apparatus according to Embodiment 1 of the present invention. Note that  FIG. 9  shows the heat-exchange unit  21  in a state in which the air-conditioning apparatus  1  is used in such a disposition state that the air-blowing direction is oriented upward or downward. Furthermore,  FIGS. 10 to 12  shows the heat-exchange unit  21  in a state in which the air-conditioning apparatus  1  is used in such a disposition state that the air-blowing direction is oriented rightward. Furthermore, in  FIGS. 10 and 12 , air flows are shown by fill-in arrows. Furthermore, in  FIG. 12 , the direction of a condensate-water flow is shown by empty arrows. 
     As shown in  FIGS. 9 to 12 , the space S is formed between the pair of heat exchangers  22  and  23  provided adjacent to each other in a V-shape, and each of both sides of the space S is blocked by a pair of air-passage plates  26 . Hence, in a state in which the air-conditioning apparatus  1  is used in such a disposition state that the air-blowing direction is oriented rightward or leftward, air flows directed from the inside of the space S to the outside of the space S through the pair of heat exchangers  22  and  23  are generated. 
     The heat-exchange unit  21  has a partition plate  27  disposed in such a state that a first region  27   a  located inside the space S and a second region  27   b  located outside the space S are formed. The partition plate  27  is disposed in such a state that a boundary between the first region ( 27   a ) and the second region ( 27   b ) is positioned at a portion between the end  22   a  of the heat exchanger  22  closer to the heat exchanger  23  and the end  23   a  of the heat exchanger  23  closer to the heat exchanger  22 . Hence, in a state in which the air-conditioning apparatus  1  is used in such a disposition state that the air-blowing direction is oriented rightward or leftward, the second region  27   b  is located on the downstream side of the first region  27   a . Furthermore, the partition plate  27  is disposed in such a state that the relative angle between the partition plate  27  and the heat exchanger  22  and the relative angle between the partition plate  27  and the heat exchanger  23  are equal. In other words, in a state in which the air-conditioning apparatus  1  is used in such a disposition state that the air-blowing direction is oriented rightward or leftward, the partition plate  27  is horizontal. 
     The partition plate  27  is inserted into a first through-hole  28   d  of a closing plate  28 , with a gap therebetween, the closing plate  28  having an end-closing portion  28   a  for closing the end  22   a , an end-closing portion  28   b  for closing the end  23   a , and a connecting portion  28   c  that connects end-closing portion  28   a  and the end-closing portion  28   b  and has the first through-hole  28   d . By closing the end  22   a  of the heat exchanger  22  and the end  23   a  of the heat exchanger  23  with the closing plate  28 , passage of air flows through the end  22   a  of the heat exchanger  22  and the end  23   a  of the heat exchanger  23  is suppressed. Furthermore, the closing plate  28  fixes the end  22   a  of the heat exchanger  22  and the end  23   a  of the heat exchanger  23 . 
     A pair of sub drain pans  29  and  30  are each disposed at corresponding one of the front and back sides of the second region  27   b  of the partition plate  27 . The partition plate  27  is held between the pair of sub drain pans  29  and  30 , whereby the positional relationship between the partition plate  27  and the first through-hole  28   d  is maintained. Furthermore, the pair of sub drain pans  29  and  30  are held by the closing plate  28 . In a state in which the air-conditioning apparatus  1  is used in such a disposition state that the air-blowing direction is oriented rightward, the sub drain pan  29  is located below the second through-hole  27   c  provided in the second region  27   b  of the partition plate  27 , and, in a state in which the air-conditioning apparatus  1  is used in such a disposition state that the air-blowing direction is oriented leftward, the sub drain pan  30  is located below the second through-hole  27   c  provided in the second region  27   b  of the partition plate  27 . In a state in which the air-conditioning apparatus  1  is used in such a disposition state that the air-blowing direction is oriented rightward, the sub drain pan  29  corresponds to a “first drain pan” of the present invention, and the sub drain pan  30  corresponds to a “second drain pan” of the present invention. In a state in which the air-conditioning apparatus  1  is used in such a disposition state that the air-blowing direction is oriented leftward, the sub drain pan  30  corresponds to the “first drain pan” of the present invention, and the sub drain pan  29  corresponds to the “second drain pan” of the present invention. 
     As shown in  FIG. 12 , in a state in which the air-conditioning apparatus  1  is used in such a disposition state that the air-blowing direction is oriented rightward, the condensate water generated in the heat exchanger  22  located on the upper side drops on the top surface of the first region  27   a  of the partition plate  27  and is guided by the air flow to the second region  27   b  through the first through-hole  28   d . The second through-hole  27   c  formed in the second region  27   b  serves as an inlet of a drain path; and the condensate water flowing into the second region  27   b  flows into the sub drain pan  29  through the second through-hole  27   c . The condensate water flowing into the sub drain pan  29  flows down on the inclined surface, is guided to a sub drain port  29   a  formed in the sub drain pan  29 , and flows into the second main drain pan  25  through a drain tube connected to the sub drain port  29   a . The condensate water flowing into the second main drain pan  25  flows down on the inclined surface, is guided to a main drain port  25   a  provided in the second main drain pan  25 , and is discharged to the outside of the main body  11 . Furthermore, the condensate water generated in the heat exchanger  23  located on the lower side directly drops on the second main drain pan  25  and is discharged to the outside of the main body  11  through the main drain port  25   a  formed in the second main drain pan  25 . In a state in which the air-conditioning apparatus  1  is used in such a disposition state that the air-blowing direction is oriented rightward, the sub drain port  29   a  corresponds to a “drain section” of the present invention. As shown in  FIGS. 9 to 12 , when more than one sub drain port  29   a  is formed, each of the sub drain ports  29   a  corresponds to the “drain section” of the present invention. 
     The hole area of the second through-hole  27   c , that is, the flow-path sectional area of the inlet of a drain path is larger than the hole area of the sub drain port  29   a  (in the case where a plurality of sub drain ports  29   a  are formed, the total hole area), that is, the flow-path sectional area of the drain section formed in the sub drain pan  29 . This configuration makes it possible to suppress the occurrence of overflow, clogging, or other problems occurring in the drain path. Furthermore, the hole area of the sub drain port  29   a  (in the case where a plurality of sub drain ports  29   a  are formed, the total hole area), that is, the flow-path sectional area of the drain section formed in the sub drain pan  29  is larger than the hole area of the main drain port  25   a  (in the case where a plurality of main drain ports  25   a  are formed, the total hole area), that is, the flow-path sectional area of the drain section formed in the second main drain pan  25 . Furthermore, the hole area of the first through-hole  28   d  formed in the closing plate  28  is smaller than the hole area of the second through-hole  27   c , that is, the flow-path sectional area of the inlet of a drain path, and is larger than the hole area of the sub drain port  29   a  (in the case where a plurality of sub drain ports  29   a  are formed, the total hole area), that is, the flow-path sectional area of the sub drain section formed in the sub drain pan  29 . 
     Also in a state in which the air-conditioning apparatus  1  is used in such a disposition state that the air-blowing direction is oriented leftward, similarly to the state in which the air-conditioning apparatus  1  is used in such a disposition state that the air-blowing direction is oriented rightward, the condensate water generated in the heat exchanger  23  located on the upper side drops on the top surface of the first region  27   a  of the partition plate  27  and is guided to the second region  27   b  through the first through-hole  28   d  by the air flow. The condensate water flowing in the second region  27   b  flows into the sub drain pan  30  through the second through-hole  27   c . The condensate water flowing into the sub drain pan  30  flows down on the inclined surface, is guided to the sub drain port  30   a  formed in the sub drain pan  30 , and flows into the second main drain pan  25  through the drain tube connected to the sub drain port  30   a . The condensate water flowing into the second main drain pan  25  flows down on the inclined surface, is guided to the main drain port  25   a  formed in the second main drain pan  25 , and is discharged to the outside of the main body  11 . Furthermore, the condensate water generated in the heat exchanger  22  located on the lower side directly drops on the second main drain pan  25  and is discharged to the outside of the main body  11  through the main drain port  25   a  formed in the second main drain pan  25 . In a state in which the air-conditioning apparatus  1  is used in such a disposition state that the air-blowing direction is oriented leftward, the sub drain port  30   a  corresponds to the “drain section” of the present invention. As shown in  FIGS. 9 to 12 , in the case where a plurality of sub drain ports  30   a  are formed, each of the sub drain ports  30   a  corresponds to a part of the “drain section” of the present invention. 
     The hole area of the second through-hole  27   c , that is, the flow-path sectional area of the inlet of a drain path is larger than the hole area of the sub drain port  30   a  (in the case where a plurality of sub drain ports  30   a  are formed, the total hole area), that is, the flow-path sectional area of the drain section formed in the sub drain pan  30 . This configuration makes it possible to suppress the occurrence of overflow, clogging, or other problems in the drain path. Furthermore, the hole area of the sub drain port  30   a  (in the case where a plurality of sub drain ports  30   a  are formed, the total hole area), that is, the flow-path sectional area of the drain section formed in the sub drain pan  30  is larger than the hole area of the main drain port  25   a  (in the case where a plurality of main drain ports  25   a  are formed, the total hole area), that is, the flow-path sectional area of the drain section formed in the second main drain pan  25 . Furthermore, the hole area of the first through-hole  28   d  formed in the closing plate  28  is larger than the hole area of the sub drain port  30   a  (in the case where a plurality of sub drain ports  30   a  are formed, the total hole area), that is, the flow-path sectional area of the drain section formed in the sub drain pan  30 . 
     The length of the partition plate  27  in the air-flow passing direction is, for example, about 70 mm. It is desirable that the length of the partition plate  27  be set to such a length that the partition plate  27  can sufficiently suppress dropping of the condensate water generated in the heat exchanger  22  or the heat exchanger  23  located on the upper side on the heat exchanger  23  or the heat exchanger  22  located on the lower side.