Patent Publication Number: US-6701737-B2

Title: Integral-type air conditioner

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an integral-type air conditioner in which an indoor heat exchanger, an indoor fan, an outdoor heat exchanger and an outdoor fan are integrally fabricated, and particularly to an integral-type air conditioner having an improvement in the structure of a bottom plate 
     2. Description of the Related Art 
     There has been known an integral-type air conditioner in which an indoor heat exchanger, an indoor fan, an outdoor heat exchanger and an outdoor fan are integrally fabricated and also an indoor side chamber having the indoor heat exchanger and the indoor fan arranged therein and the inside of the air conditioner is partitioned into an outdoor side chamber having the outdoor heat exchanger and the outdoor fan arranged therein by a partition plate. 
     In the air conditioner as described above, a drain pan on which the indoor heat exchanger is mounted is disposed in the indoor-side chamber. The drain pan is mounted on a bottom plate on which the partition plate is fixedly mounted so as to be erected. 
     In such an air conditioner, drain water generated by the indoor heat exchanger functioning as an evaporator under cooling operation passes through the drain pan, and then it is guided through a drain opening formed in the partition plate to the bottom plate. The drain water thus guided to the bottom plate is discharged to the outside, or it is stocked on the bottom plate and drained up by rotation of a slinger ring of the outdoor fan to scatter the drain water to the outdoor heat exchanger functioning as a condenser, thereby enhancing the condensation capability of the condenser. 
     In the case where the drain water is stocked on the bottom plate as described above, a dam member is mounted on the bottom plate. Further, the dam member has also a function of preventing drain water generated by the outdoor heat exchanger from invading into the inside of the dam member. Therefore, there can be avoided such a problem that the drain water thus invading is frozen and collides against the slinger ring. The dam member having the above function as described above has been hitherto formed of a separate part from the bottom plate, and it is fixed to the bottom plate by spot welding or the like and then subjected to a waterproof treatment. Accordingly, the manufacturing cost of the bottom plate rises up. 
     In the air condition as described above, the outdoor-side chamber intercommunicates with the outside air. Accordingly, for example, there is such a problem that under rainstorm such as hurricane or the like, wind and rain invade into the outdoor-side chamber, pass through the drain opening of the partition plate into the indoor-side chamber and finally invade into the room. 
     Further, the partition plate is equipped with a fixing flange extending to the indoor-side chamber at the lower end thereof, and the fixing flange portion is fixed to the bottom plate, whereby the partition plate is fixedly mounted on the bottom plate. However, under rainstorm or the like, rain drops which invade into the outdoor-side chamber of the air conditioner and attach to a surface of the partition plate facing the outdoor-side chamber may fall down, pass through the gap between the fixing flange portion of the partition plate and the bottom plate into the indoor-side chamber, and scatter from the indoor-side chamber into the room. 
     SUMMARY OF THE INVENTION 
     The present invention has been implemented in view of the foregoing situation, and has an object to provide an integral-type air conditioner for which the manufacturing cost of a bottom plate can be reduced. 
     The present invention has another object to provide an integral-type air conditioner which can prevent intensive wind and rain from invading into the room. 
     In order to attain the above objects, according to an aspect of the present invention, there is provided an air conditioner comprising an indoor heat exchanger, an indoor fan, an outdoor heat exchanger and an outdoor fan which are integrally equipped, the indoor heat exchanger and the indoor fan being disposed in an indoor-side chamber while the outdoor heat exchanger and the outdoor fan is disposed in an outdoor-side chamber, the indoor-side chamber and the outdoor-side chamber being partitioned by a partition plate mounted on a bottom plate, characterized in that the outdoor heat exchanger is disposed on the bottom plate, and the bottom plate is integrally formed with a dam member for damming up drain water flowing from at least one of the indoor heat exchanger and the outdoor heat exchanger. 
     In the above air conditioner, the dam member is disposed in the neighborhood of the outdoor heat exchanger. 
     In the above air conditioner, the bottom plate is formed of a drawing member having high malleability, and the dam member is integrally formed on the bottom plate by drawing processing. 
     In the above air conditioner, the dam member is designed substantially in U-shape so that the center portion thereof extends in the width direction of the bottom plate. 
     The above air conditioner further comprises a fan casing in which the outdoor fan is accommodated, wherein the dam member is disposed so as to abut against the fan casing. 
     In order to attain the above objects, there is provided an air conditioner comprising an indoor heat exchanger, an indoor fan, an outdoor heat exchanger and an outdoor fan which are integrally equipped, the indoor heat exchanger and the indoor fan being disposed in an indoor-side chamber while the outdoor heat exchanger and the outdoor fan is disposed in an outdoor-side chamber, the indoor-side chamber and the outdoor-side chamber being partitioned by a partition plate mounted on a bottom plate, characterized in that a drain pan on which the indoor heat exchanger is mounted is disposed on the bottom plate, the partition plate is equipped with a drain opening through which drain water flowing from the indoor heat exchanger through the drain pan is flows to the bottom plate, and at least one of the drain pan and the partition plate is equipped with an intercepting member for intercepting flow of rain/wind from the outdoor-side chamber to the indoor-side chamber. 
     In the above air conditioner, the intercepting member is a projecting portion that is erectly equipped on the drain pan so as to face the drain opening. 
     In the above air conditioner, the intercepting member is a flange portion that is formed at the lower end portion of the partition plate so as to extend to the outdoor-side chamber. 
     In the above air conditioner, the flange portion is fixed to the bottom plate to thereby fix the partition plate to the bottom plate.  10 . The air conditioner as claimed in claim 8, wherein the bottom plate is equipped with a projecting portion extending in the longitudinal direction of the partition plate, and the flange portion of the partition plate is fixed to the projecting portion of the bottom plate while the flange portion extends from the projecting portion to the outdoor-side chamber. 
     The above air conditioner further comprises an indoor fan casing in which the indoor fan is accommodated, wherein the indoor fan casing is disposed between the indoor fan and the partition plate so that flow of rain/wind from the outdoor-side chamber to the indoor-side chamber is intercepted by the indoor fan casing. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view showing the outlook of an embodiment of an air conditioner according to the present invention; 
     FIG. 2 is an exploded perspective view showing the air conditioner shown in FIG. 1 when a cabinet is omitted; 
     FIG. 3 is a longitudinally-sectional view of the air conditioner shown in FIG. 1; 
     FIG. 4 is a plan view showing the air conditioner shown in FIG. 1 when the cabinet is omitted; 
     FIG. 5 is an exploded perspective view showing a partition plate, a cross-flow fan, a ventilation device, etc. of FIG. 2; 
     FIG. 6 is a plan view corresponding to FIG. 4, which shows a fabrication state of the ventilation device, etc. of FIG. 5; 
     FIG. 7 is an exploded perspective view showing a bottom plate, a drain pan and a partition plate of FIG. 2; 
     FIG. 8 is a perspective view showing a fabrication state of the bottom plate, the drain pan, an indoor heat exchanger and an outdoor heat exchanger; 
     FIG. 9 is a cross-sectional view taken along IX—IX line of FIG. 7, which shows an enlarged IX portion of FIG. 3; and 
     FIG. 10 is a cross-sectional view taken along X—X line of FIG.  7 . 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Preferred embodiments according to the present invention will be described hereunder with reference to the accompanying drawings. 
     FIG. 1 is a perspective view showing the outlook of an embodiment of an air conditioner according to the present invention, and FIG. 2 is an exploded perspective view showing the air conditioner of FIG. 1 when a cabinet is omitted from the illustration. 
     The air conditioner  10  shown in FIGS. 1 and 2 is an integral-type air conditioner which is set up while penetrating through the wall of a building (not shown), and it comprises an indoor heat exchanger  11 , a cross-flow fan  12  (FIG. 3) serving as an indoor fan, an outdoor heat exchanger  13 , a propeller fan  14  serving as an outdoor fan, a compressor  15 , etc. which are integrally fabricated. 
     The indoor heat exchanger  11 , the cross-flow fan  12 , the outdoor heat exchanger  13 , the propeller fan  14 , the compressor  15 , etc. are disposed on the bottom plate  16  to constitute the main body  17  of the air conditioner. The front side of the air-conditioner main body  17  (that is, the arrangement side of the indoor heat exchanger  11  and the cross-flow fan  12 ) is covered by a front panel  18 , and the rear side thereof (that is, the arrangement side of the outdoor heat exchanger  13 , the propeller fan  14  and the compressor  15 ) is covered by a cabinet  19 . The front panel  18  is located to face the inside of the room of the building. The cabinet  19  is set up in the wall of the building while it penetrates through the wall of the building, and the cabinet  19  is designed to have a sleeve-like shape such as a cylindrical shape, a prismatic shape or the like. 
     As shown in FIGS. 3 and 4, in the air-conditioner main body  17 , a partition plate  20  is erectly equipped at the substantially center position in the front and rear direction of the bottom plate  16  so as to extend in the full-width direction of the bottom plate  16 . The partition plate  20  compartments the inside of the air-conditioner main body  17  into an indoor-side chamber  21  in which the indoor heat exchanger  11 , the cross-flow fan  12 , etc. are arranged and an outdoor-side chamber  22  in which the outdoor heat exchanger  13 , the propeller fan  14 , the compressor  15 , etc. are arranged. Accordingly, the front panel  18  disposed at the front side of the air conditioner  10  covers the indoor-side chamber  21 , and the cabinet  19  disposed at the rear side of the air conditioner  10  compartment the surrounding of the outdoor-side chamber  22 . 
     The outdoor heat exchanger  13 , an outdoor fan casing  23 , a support leg  24  and the compressor  15  are disposed at the outdoor-side chamber side on the bottom plate  16 . 
     The compressor  15  is connected to the outdoor heat exchanger  13 , a pressure reducing device (not shown) and the indoor heat exchanger in this order through a refrigerant pipe (not shown), thereby constructing a refrigeration cycle. When the air conditioner  10  is under cooling operation, the outdoor heat exchanger  13  functions as a condenser, and the indoor heat exchanger  11  functions as an evaporator. When the air conditioner  10  is under heating operation, the outdoor heat exchanger  13  functions as an evaporator, and the indoor heat exchanger  11  functions as a condenser. 
     The outdoor fan casing  23  is disposed so as to be connected t the outdoor heat exchanger  13 , and the propeller fan  14  is disposed inside the outdoor fan casing  23 . The propeller fan  14  is rotated by an outdoor driving motor  25 , and the outdoor driving motor  25  is supported on the support leg  24  The outdoor-side chamber  22  is partitioned into an outdoor discharge chamber at the inside of the outdoor fan casing  23  and an outdoor suction chamber  27  at the outside of the outdoor fan casing  23  by the outdoor fan casing  23 . 
     By rotation of the propeller fan  14 , the outside air is sucked from the outdoor suction ports  28 A,  28 B at both the sides of the outdoor heat exchanger  13  into the outdoor suction chamber  27  as shown by arrows A of FIG. 4, passed through the a fan orifice  29  of the outdoor fan casing  23  and then discharged into the outdoor discharge chamber  26 . Thereafter, the outside air is passed through the outdoor heat exchanger  13  and then discharged from the outdoor discharge port  30  to the outside. Under the cooling operation of the air conditioner  10 , the outdoor heat exchanger  13  discharge heat to the outside air, and under the heating operation of the air conditioner  10 , the outdoor heat exchanger  13  takes heat from the outside air. 
     As shown in FIG. 3, each vane of the propeller fan  14  is equipped with a slinger ring on the outer peripheral portion thereof to link the vanes to one another. Under the cooling operation of the air conditioner  10 , drain water occurs on the indoor heat exchanger  11  serving as the evaporator. The drain water is collected in a drain pan  33  as described later, and then it is passed through a drain opening  44  formed at the lower end portion of the partition plate  20  and stocked into a reservoir portion  32  disposed on the bottom plate  16 . The slinger ring  31  drains up the drain water stocked in the reservoir portion  32  when the propeller fan  14  is rotated, and the drain water thus drained up is scattered to the outdoor heat exchanger  13  functioning as the condenser, whereby the condensation function of the outdoor heat exchanger is enhanced. 
     The drain pan  33  is disposed at the indoor-side chamber side on the bottom plate  16 , and the indoor heat exchanger  11  is disposed on the drain pan  33 . The partition plate  20  is designed in a box-shape having an opening at the indoor-side chamber side, and an indoor fan casing  34  is disposed inside the partition plate  20 . 
     The indoor fan casing  34  is curved from the position corresponding to a first top panel  41  (described later) of the partition plate  20  so as to extend to the drain pan  33 , and an electrical heater  55  is disposed at the lower end portion of the indoor fan casing  34  so as to be adjacent to the indoor heat exchanger  11 . A cross-flow fan  12  is disposed at the inside of the curved indoor fan casing. Accordingly, the indoor fan casing  34  is disposed between the partition plate  20  and the cross-flow fan  12 . 
     The cross-flow fan  12  is rotated by an indoor driving motor  35  shown in FIG. 4, and the cross-flow fan  12  and the indoor driving motor  35  are supported on the partition plate  20 . The indoor fan casing  34  forms an indoor circulating chamber  36  and an outside air introducing chamber  37  at the indoor-side chamber side as shown in FIG.  3 . Further, as shown in FIG. 4, an electrical-equipment chamber  46  in which an electrical-equipment ox  45  is accommodated is formed at the indoor-side chamber side. 
     The indoor heat exchanger  11 , the cross-flow fan  12  and the electrical heater  55  are disposed in the indoor circulating chamber  36  as shown in FIG.  3 . Further, an air filter  38  and a stabilizer  39  are disposed in the indoor circulating chamber  36 . The air filter  38  is disposed between a suction grille  40  formed in a front panel  18  and the indoor heat exchanger  11 . The stabilizer  39  is disposed at the upper side of the indoor heat exchanger  11  so as to extend to the cross-flow fan  12 . The stabilizer  39  enables the air in the indoor circulating chamber  36  to be excellently sucked into the cross-flow fan  12 , and the air thus sucked can be excellently discharged from the cross-flow fan  12 . A blow-out grille  43  for guiding the discharged air into the room of the building is formed at the upper side of the suction grille  40  on the front panel  18 . 
     The air in the room of the building is taken from the suction grille  40  into the indoor circulating chamber  36  of the indoor-side chamber  21  by the rotation of the cross-flow fan  12 . The air thus taken is passed through the air filter  38 , the indoor heat exchanger  11  and the electrical heater  55  in this order, and then sucked into the cross-flow fan  12 . Thereafter, the air is discharged from the cross-flow fan  12 , and blown out from the blow-out grille  43  into the room. Under the cooling operation of the air conditioner  10 , the indoor heat exchanger  11  cools the indoor air taken in the indoor circulating chamber  36  to cool the inside of the room. Under the heating operation, the indoor air is heated to heat the inside of the room. 
     The outside air introducing chamber  37  is one of constituent elements constituting a ventilation device for taking the outside air from the outdoor-side chamber  22  into the indoor circulating chamber  36  of the indoor-side chamber  21 , whereby fresh air can be supplied into the room of the building. The ventilation device  47  is constructed by ventilation ports  48 , a ventilation shutter  49  and a ventilation aeration portion  50 A in addition to the outside air introducing chamber  37 . 
     A second top panel  42  is formed at the lower position than the first top panel  41  on the box-shaped partition plate  20  so as to intercommunicate with the first top panel  41 . The second top panel  42  is disposed inside the cabinet  19  compartmenting the surrounding of the outdoor-side chamber  22 . As shown in FIGS. 4 and 5, a plurality of ventilation ports  48  are formed in the second top panel  42  to be juxtaposed with one another at the same pitch in the longitudinal direction of the second top panel  42 . 
     A ventilation shutter  49  having many fine holes  51  formed therein is mounted on the second top panel  42 . These fine holes  51  are gathered every group, and plural fine-hole groups  51 A are arranged at the same pitch in the longitudinal direction of the ventilation shutter  49 . The pitch of the fine-hole groups  51 A is set to substantially the same pitch as the ventilation ports  48  of the second top panel  42 . 
     Elongated holes  52  extending in the longitudinal direction of the ventilation shutter  49  are formed at both the end portions of the ventilation shutter  49 . The ventilation shutter  49  is fixed to the second top panel  42  of the partition plate  20  through screws penetrating through the elongated holes  52  so as to be freely slidable in the longitudinal direction of the second top panel  42  and the ventilation shutter  49 . 
     As shown in FIG. 6, when the fine-hole groups  51 A of the ventilation shutter  49  are positionally coincident with the ventilation ports  48  by sliding the ventilation shutter  49 , the ventilation ports  48  are fully opened. On the other hand, when the fine-hole groups  51 A are not positionally coincident with the ventilation ports  48  and the ventilation shutter  49  closes the ventilation ports  48 , the ventilation ports  48  are fully closed. Further, by sliding the ventilation shutter  49  to any position between the full-open position and the full-close position, the opening degree of the ventilation ports  48  can be freely adjusted to any intermediate value between the full-open value and the full-close value, such as a half-open value, a second-thirds open value or the like. Through the opening operation of the ventilation ports  48 , the outside air flowing into the outdoor-side chamber  22  is guided by the cabinet  19  to pass through the fine holes  51  of the ventilation shutter  49  and the ventilation ports  48  of the second top panel  42 , and then introduced into the outside introducing chamber  37 . 
     Here, the ventilation ports  48  are designed to be inclined downwardly to the outdoor-side chamber  22 , whereby the fluid flow area of the outside air between the second top panel  42  and the cabinet  19  is more greatly enlarged as compared with the case where the ventilation ports  48  are designed to be horizontal. Further, each of the fine holes  51  of the ventilation shutter shown in FIG. 6 is formed to have a remarkably smaller diameter than the opening area of the ventilation ports  48 , whereby the diameter of each fine hole  51  is set to such a value that it functions as an air filter to prevent invasion of insects, dust, etc. 
     The ventilation aeration portion  50 A is equipped with plural vent ports  50  at the lower portion of the indoor fan casing  34  as shown in FIG.  5 . The vent ports  50  are formed in a louver-shape so as to be juxtaposed with one another by cutting the lower portion of the indoor fan casing  34  into plural pieces and erecting the pieces thus achieved as shown in FIG. 5. A plurality of ventilation aeration portions  50 A as described above are formed in the longitudinal direction of the indoor fan casing  34  except for the position corresponding to the drain opening  44  of the partition plate  20 . 
     When the cross-flow fan  12  is rotated, the space below the cross-flow fan  12  in the indoor circulating chamber  36 , that is, the space in the neighborhood of the ventilation aeration portions  50 A is kept under negative pressure as shown in FIG.  3 . Therefore, as indicated by arrows C of FIG. 3, the outside air introduced through the fine holes  51  of the ventilation shutter  49  and the ventilation ports  48  of the second top panel  42  into the outside air introducing chamber  37  downwardly flows along the outside of the curved indoor fan casing  34 , passes through the aeration ports  50  of the plural ventilation aeration portions  50 A and then is guided into the indoor circulating chamber  36 . The outside air thus guided into the indoor circulating chamber  36  is mixed with the indoor air air-conditioned by the indoor heat exchanger  11 , and introduced from the blow-out grille  43  of the front panel  18  into the room of the building, whereby fresh air is supplied into the room. 
     As shown in FIG. 5, an operating lever  54  is integrally linked to one end portion of the ventilation shutter  49 . The operating lever  54  is disposed so as to extend to the indoor heat exchanger  11  as shown in FIGS. 2 and 6 so that it can be manipulated when the front panel  18  is detached from the main body of the air conditioner or the like. By manipulating the operating lever horizontally, the ventilation shutter  40  is directly slid to any position with no wire, whereby the opening degree of the ventilation ports  48  can be adjusted to any value such as the full-open value, the full-close value, the half-open value, etc. 
     In the outdoor-side chamber, the outdoor heat exchanger  13  is disposed on the bottom plate  16  on which the partition plate is erectly provided as shown in FIG.  3 . The bottom plate  16  is formed of a drawing member which has high malleability and is easily expandable. A dam member  56  for damming stream of drain water is integrally formed on the bottom plate  16  so as to be located in the neighborhood of the outdoor heat exchanger  13  by a drawing processing as shown in FIG.  8 . 
     As shown in FIG. 7, the dam member  56  is designed substantially in U-shape so that the center portion  56 A thereof extends in the width (W) direction of the bottom plate  16  and both the ends  56 B extend in the direction to the indoor-side chamber  21 . The inside of the dam member  56  forms the reservoir portion  32  in which the drain water can be stocked. 
     Under the cooling operation of the air conditioner, the indoor heat exchanger  11  functions as an evaporator and the outdoor heat exchanger  13  functions as a condenser as shown in FIG.  3 . Drain water generated by the indoor heat exchanger  11  passes through the drain pan  33  and the drain opening  44  of the partition plate  20 , flows down to the outdoor-side chamber side of the bottom plate  16 , and then is stocked in the reservoir portion  32 . Extra drain water overflowing from the reservoir portion  32  is discharged from a drain port  57  (FIG. 7) to the outside. The drain water stocked in the reservoir portion  32  is drained up by rotation of a slinger ring  31  of an outdoor fan (propeller fan)  14  and scattered and attached to the outdoor heat exchanger. The drain water attached to the outdoor heat exchanger  13  is vaporized to enhance the condensation capability of the outdoor heat exchanger  13 . 
     Under the heating operation of the air conditioner  10 , the indoor heat exchanger functions as a condenser and the outdoor heat exchanger  13  functions as an evaporator. As shown in FIG. 8, drain water generated by the outdoor heat exchanger  13  is stocked at an outside area  58  of the dam member  56  of the bottom plate  16  on which the outdoor heat exchanger  13  is mounted, and prevented from flowing into the reservoir portion  32  inside the dam member  56  by the dam member  56 . If the drain water generated by the outdoor heat exchanger  13  flows into the reservoir portion  32 , the drain water may be frozen, so that there is a risk that the frozen drain water collides against the slinger ring  31  of the propeller fan  14  to generate abnormal noise. In order to prevent occurrence of such abnormal noise, the dam member  56  serves to prevent the drain water generated by the outdoor heat exchanger  13  from flowing into the reservoir portion  32 . 
     As shown in FIGS. 3 and 6, the dam member  56  is disposed so that the outdoor fan casing  23  abuts against both the end portions  56 B of the dam member  56 . Accordingly, the outdoor fan casing  23  is excellently supported on the bottom plate  16  through the dam member  56 . 
     According to the above-described embodiment, the following effects (1) to (4) can be achieved. 
     (1) The dam member  56  for damming flow of drain water is integrally formed on the bottom plate  16  on which the outdoor heat exchanger  13  is disposed so that the dam member  56  is located in the neighborhood of the outdoor heat exchanger  13 . Therefore, the manufacturing cost of the bottom plate  16  can be reduced as compared with the case where the dam member  56  is manufactured as a separate part from the bottom plate  16 , the separate part (dam member  56 ) thus manufactured is fixed to the bottom plate  16  and then a sealing treatment is conducted on the dam member  56  and the bottom plate  16 . 
     (2) Since the dam member  56  is integrally formed on the bottom plate  16  by the drawing processing, the dam member  56  can enhance the mechanical strength of the bottom plate  16 . 
     (3) The dam member  56  is designed substantially in U-shape so that the center portion  56 A thereof extends in the width W direction of the bottom plate  16 . Therefore, when the outdoor heat exchanger  13  functions as a condenser, drain water is stocked in the reservoir portion  32  inside the dam member  56 , and the drain water is scattered to the condenser by rotation of the slinger ring  31  of the propeller fan  14  to enhance the condensation capability. Further, when the outdoor heat exchanger  13  functions as an evaporator, the drain water generated by the evaporator can be prevented from flowing into the reservoir portion  32  inside the dam member  56 . Therefore, there can be avoided such a problem that the drain water is frozen in the reservoir portion  32  and collide against the slinger ring  31 . 
     (4) The outdoor fan casing  23  in which the propeller fan  14  is accommodated abuts against the dam member  56  of the bottom plate  16 , so that the outdoor fan casing  23  can be supported on the bottom plate  16  through the dam member  56  and thus the outdoor fan casing  23  can be more surely supported on the bottom plate  16 . 
     As shown in FIGS. 7 and 10, a fixing flange portion  66  which is bent in an L-shape and extends in the direction to the outdoor-side chamber  22  is formed at the lower end of the partition plate  20 . A projecting portion  57  extending linearly in the longitudinal direction of the partition plate  20  is integrally formed on the bottom plate  16  by the drawing processing or the like. As shown in FIG. 10, the fixing flange portion  66  of the partition plate  20  is fixed to the projecting portion  57  by screws  61  or the like under the state that the fixing flange portion  66  extends from the projecting portion  57  in the direction to the outdoor-side chamber  22 , whereby the partition plate  20  is erectly mounted on the bottom plate  16 . Accordingly, even when under a terrible storm such as a hurricane or the like, rain water passes through the outdoor-side chamber  22  and flows down while attached to a surface  62  of the partition plate  20  which faces the outdoor-side chamber  22  as indicated by an arrow D of FIG. 10, the rain water flows down from the tip of the fixing flange portion  66  extending in the direction to the outdoor-side chamber  22  to the bottom plate  16  at the outdoor-side chamber ( 22 ) side. Therefore, the rainwater is prevented from passing through the gap between the fixing flange portion  66  and the projecting portion  57  of the bottom plate  16  and invading into the indoor-side chamber  21 . 
     Further, the fixing flange portion  66  of the partition plate  20  is designed to further extend in the direction to the outdoor-side chamber  22  as compared with the projecting portion  57  of the bottom plate  16 . Therefore, even when drain water stocked in the outdoor-side chamber  22  of the bottom plate  16  is agitated by the wind of terrible storm such as hurricane or the like and invades over the projecting portion  57  of the bottom plate  16  into the indoor-side chamber  21 , the invasion of the drain water is prevented by the fixing flange portion  66  of the partition plate  20 . 
     Further, the drain opening  44  described above is formed at the center portion in the longitudinal direction of the lower end of the partition plate  20  as shown in FIG.  7 . At the lower end of the partition plate  20 , the fixing flange portion  66  is not formed at the position corresponding to the drain opening  44 . 
     As shown in FIG. 8, the drain pan  33  mounted on the bottom plate  16  is integrally formed with a drain tag portion  58 A which is inserted into the drain opening  44  of the partition plate  20  under the condition that the partition plate  20  and the drain pan  33  are mounted on the bottom plate  16 . As shown in FIG. 9, the drain tag portion  58 A and the drain opening  44  form a drain flow channel through which the drain water flows from the drain pan  33  into the reservoir portion  32  of the bottom plate  16 . 
     Further, the drain pan  33  is integrally formed with a projecting portion  60  at the position confronting to the drain opening  44  of the partition plate  20 , that is, at the position corresponding to the drain tag portion  58 A in the outside air introducing chamber  37 . The position and dimension of the projecting portion  60  are determined so that when rainstorm of hurricane or the like invades through the drain flow channel  59  as indicated by arrows F of FIG. 9, the rainstorm can be prevented by the projecting portion  60 . 
     As shown in FIG. 3, plural ventilation aeration portions  50 A are formed in the indoor fan casing  34  through which the indoor-side chamber  21  is compartmented into the outside air introducing chamber  37  and the indoor circulating chamber  36 . As shown in FIG. 5, no ventilation aeration portion  50 A is formed at the portion corresponding to the drain opening  44  of the partition plate  20  and the projecting portion  60  of the drain pan  33 , and this portion is set as a rain/wind collision portion  63 . 
     Accordingly, rainstorm of hurricane or the like passes through the drain flow channel  59  and invades into the outside air introducing chamber  37  of the indoor-side chamber  21 , and collides against the projecting portion  60  of the drain pan  33 . Thereafter, the rainstorm collides against the rain/wind collision portion  63  of the indoor fan casing  34  without colliding the projecting portion  60  again. Accordingly, the rainstorm is dammed up by the rain/wind collision portion  63 , and it can be surely prevented from invading into the indoor circulating chamber  36 . 
     As described above, the rain water invasion preventing mechanism is constructed by the fixing flange portion  66  of the partition plate  20 , the projecting portion  57  of the bottom plate  16 , the projecting portion  60  of the drain pan  33  and the rain/wind collision portion  63  of the indoor fan casing  34 , and thus the following effects (1) to (4) can be achieved. 
     (1) The drain pan  33  which is mounted in the indoor-side chamber  21  and on which the indoor heat exchanger  11  is mounted is provided with the projecting portion  60  so that the projecting portion  60  faces the drain opening  44  formed in the partition plate  20  through which the indoor-side chamber  21  and the outdoor-side chamber  22  are partitioned. Therefore, even when rainstorm of hurricane or the like passes through the drain flow channel  59  formed by the drain opening  44 , etc. and then invades into the outside air introducing chamber  37  of the indoor-side chamber  21 , the invasion can be prevented by the projecting portion  60 . As a result, the rainstorm can be prevented from passing through the indoor-side chamber  21  of the air conditioner  10  and invading into the room. 
     (2) The indoor fan casing  34  is disposed between the cross-flow fan  12  and the partition plate  20  in the indoor-side chamber  21  of the air conditioner  10  and rainstorm is made to collide against the rain/wind colliding portion  63  of the indoor fan casing  34 . Therefore, even when rainstorm which passes through the drain flow channel  59  formed by the drain opening  44 , etc. of the partition plate  20  and invades into the outside air introducing chamber  37  of the indoor-side chamber  21  does not collide against the projecting portion  60  of the drain pan  33  or it collides against the projecting portion  60 , but its power is not attenuated, the rainstorm can be dammed up by the rain/wind colliding portion  63  of the indoor fan casing  34 . As a result, rainstorm can be surely prevented from passing through the indoor-side chamber  21  of the air conditioner  10  and invading into the room. 
     (3) The fixing flange portion  66  of the partition plate  20  is fixed to the projecting portion  57  under the condition that it extends from the projecting portion  57  of the bottom plate  16  in the direction to the outdoor-side chamber  22 . Therefore, even when rainstorm collides against the partition plate  20  and rain water attaches to the surface  62  of the partition plate  20  which confronts the outdoor-side chamber  22 , the rain water flows down from the tip of the fixing flange portion  66  to the outdoor-side chamber side of the bottom plate  16 . Therefore, the rain water can be prevented from leaking to the indoor-side chamber  21 . As a result, rainstorm (particularly rain water) can be prevented from passing through the indoor-side chamber  21  of the air conditioner  10  and invading into the room. 
     (4) The fixing flange portion  66  of the partition plate  20  is designed to further extend to the outdoor-side chamber side as compared with the projecting portion  57  of the bottom plate  16 , Therefore, even when drain water stocked on the bottom plate  16  is agitated by rainstorm of hurricane or the like, it is dammed up by the fixing flange portion  66 , and thus rainstorm can be prevented from passing over the projecting portion  57  and invading through the gap between the projecting portion  57  and the fixing flange portion  66  into the indoor-side chamber  21 . 
     The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the subject mater of the present invention. 
     According to the present invention, the manufacturing cost of the bottom plate can be reduced. Further, rain/wind under rainstorm or the like can be prevented from invading into the room.