Patent Publication Number: US-6658882-B2

Title: Integral-type air conditioner

Description:
This application claims the priority of Japanese patent application No. 2001-242038, which was filed on Aug. 9, 2001, Japanese patent application No. 2001-266926, which was filed on Sep. 4, 2001, and Japanese patent application No. 2001-268588, which was filed on Sep. 5, 2001, which are hereby incorporated by reference in their entirety. 
    
    
     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. 
     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. Japanese Laid-open Patent Application No. Hei-6-2886 discloses one of such integral-type air conditioners. 
     The air conditioner disclosed in the above publication has indoor and outdoor-side chambers which are partitioned by a partition plate. An indoor heat exchanger, an electrical heater and a cross-flow fan are arranged in this order in the indoor-side chamber, and an outdoor heat exchanger and an outdoor fan device are arranged in the outdoor-side chamber. 
     In the air conditioner thus constructed, a ventilation port through which the outside air is selectively supplied into the indoor-side chamber is formed in the partition plate, and a ventilation door is pivotally equipped to the partition plate through a hinge. The ventilation port is selectively opened/closed by opening/closing the ventilation door. When the ventilation port is made open by opening the ventilation door, the outside air is passed through the outdoor-side chamber and the ventilation port in this order and introduced into the indoor-side chamber. The outside air thus introduced is guided into the room together with the indoor air heat-exchanged by an indoor heat exchanger in the indoor-side chamber, thereby ventilating the room. 
     Further, in the above-described air conditioner, the electrical heater is disposed in the indoor-side chamber so as to be adjacent to the indoor heat exchanger. The indoor air heat-exchanged by the indoor heat exchanger is also heated by the electrical heater and then blown out to the room, thereby heating the inside of the room. Here, the indoor heat exchanger is mounted on a drain pan, and drain water occurring on the indoor heat exchanger is collected in the drain pan. The electrical heater is located above the drain pan. 
     Still further, in the above-described air conditioner, the outdoor fan device comprises a propeller fan device. The outdoor fan device has an outdoor motor mounted on a support leg disposed in the outdoor-side chamber, and the propeller fan is rotated by the outdoor motor. The outdoor motor is disposed at the air-suction side of the propeller side, and the air around the outdoor motor is sucked into the propeller fan by the rotation of the propeller fan. The air thus sucked is blown out to the outdoor heat exchanger. 
     In the above-described air conditioner, the ventilation device needs not only the ventilation door and the hinge, but also a wire through which the opening/closing operation of the ventilation door is carried out, an operation knob equipped to one end of the wire and other kinds of parts such as an air filter, etc. mounted at the ventilation port. Therefore, the ventilation device itself needs a large number of parts to selectively supply the outside air into the indoor-side chamber, and it must be designed in a complicated structure. 
     In addition, the above ventilation device is designed in a door structure, and thus only the full-opening/full-closing operation of the ventilation port is allowed. Therefore, it is impossible to adjust the opening degree of the ventilation port. Further, when the ventilation port is kept opened under terrible storm such as hurricane or the like, strong rain and window may pass through the ventilation port and invades into the indoor-side chamber, so that the room is exposed to rain. 
     Further, if the outside damp air passes through the opened ventilation port into the indoor-side chamber under cooling operation, the damp air is brought into contact with the indoor fan, etc. cooled under cooling operation in the indoor-side chamber to induce dew condensation, so that dew drops thus induced are scattered into the room. 
     In the above-described air conditioner, the electrical heater is installed in the indoor-side chamber while suspended by a stabilizer mounted at the upper portion of the indoor heat exchanger. Accordingly, the installation precision of the electrical heater is dependent on the fixing precision of the electrical heater to the stabilizer and the fixing precision of the stabilizer to the indoor heat exchanger. As a result, the installation of the electrical heater must be performed sufficiently carefully. In addition, the electrical heater is located above the drain pan as described above, however, the radiation heat of the electrical heater to the drain pan is not sufficiently intercepted, so that the drain pan may be thermally distorted when it is formed of foam polystyrene or the like. 
     In the above-described air conditioner, the air around the outdoor motor is sucked into the propeller fan by the rotation of the propeller fan. At this time, the air streams flowing from the opposite sides to the propeller fan in the opposite directions comes into collision with each other, so that turbulence may occur in the air flow. Therefore, the amount of the air sucked into the propeller fan may be reduced, so that the amount of the air blown out by the propeller is reduced. 
     SUMMARY OF THE INVENTION 
     Therefore, the present invention has implemented from the view of the foregoing situation, and an object of the present invention is to provide an integral-type air conditioner that can perform excellent ventilation with a simple construction. 
     The present invention has another object to provide an integral-type air conditioner that can enhance installation of a heater, and still further object to provide an integral-type air conditioner that can prevent a drain pan from being thermally distorted by the heater. 
     The present invention has still further object to provide an axial fan device that can increase a fan discharging amount (air blow-out amount from a fan), and also provide an integral-type air conditioner having the axial fan device. 
     In order to attain the above objects, according to the present invention, according to a first aspect of the present invention, there is provided an air conditioner ( 10 ) comprising an indoor heat exchanger ( 11 ), an indoor fan ( 12 ), an outdoor heat exchanger ( 13 ) and an outdoor fan ( 14 ) which are integrally equipped, the indoor heat exchanger ( 11 ) and the indoor fan ( 12 ) being disposed in an indoor-side chamber ( 21 ) while the outdoor heat exchanger ( 13 ) and the outdoor fan ( 14 ) is disposed in an outdoor-side chamber ( 22 ), the indoor-side chamber ( 21 ) and the outdoor-side chamber ( 22 ) being partitioned by a partition plate ( 20 ), characterized in that the partition plate ( 2 ) is equipped with a top panel ( 42 ) having a ventilation opening portion through which the outside air is supplied from the outdoor-side chamber ( 22 ) into the indoor-side chamber ( 21 ), and a ventilation shutter ( 49 ) for opening/closing the ventilation opening portion ( 48 ) of the top panel ( 42 ) at any open area ratio to freely adjust the opening degree of the ventilation opening portion ( 48 ). 
     In the air conditioner, the ventilation shutter ( 49 ) is secured to the top panel ( 42 ) so as to be freely slidable, and the opening degree of the ventilation opening portion ( 48 ) is freely adjusted through the sliding motion of the ventilation shutter ( 49 ). 
     The air conditioner further comprises a cabinet ( 19 ), wherein the cabinet ( 19 ) is designed in a sleeve shape, and the surrounding of the outdoor-side chamber ( 22 ) is compartmented by the cabinet ( 19 ), and the top panel ( 42 ) of the partition plate ( 20 ) is disposed inside the cabinet ( 19 ). 
     In the air conditioner, the top panel ( 42 ) of the partition plate ( 20 ) is designed to be downwardly inclined to the outdoor-side chamber ( 22 ). 
     The air conditioner further comprises a fan casing ( 34 ) disposed between the partition plate ( 20 ) and the indoor fan ( 12 ) in the indoor-side chamber, wherein vent ports ( 50 ) are formed at the lower portion of the fan casing ( 34 ), and the outside air introduced from the ventilation opening portion ( 48 ) of the partition plate ( 20 ) into the indoor-side chamber ( 21 ) is guided to the indoor fan ( 12 ) through the vent ports ( 50 A). 
     In the air conditioner, the ventilation opening portion ( 48 ) comprises plural ventilation ports that are formed in the top panel ( 42 ) in juxtaposition with one another. 
     In the air conditioner, the ventilation shutter ( 49 ) is equipped with a large number of fine holes ( 51 ) each having an opening area smaller than each of the ventilation ports ( 48 ). 
     In the air conditioner, the ventilation shutter ( 49 ) is equipped with a lever ( 54 ) extending to the indoor-side heat exchanger side, the opening degree of the ventilation ports ( 48 ) being adjusted by sliding the lever ( 54 ). 
     According to a second aspect of the present invention, there is provided an air conditioner ( 10 ) comprising an indoor heat exchanger ( 11 ), an indoor fan ( 12 ), an outdoor heat exchanger ( 13 ) and an outdoor fan ( 14 ) which are integrally equipped, the indoor heat exchanger ( 11 ) and the indoor fan ( 12 ) being disposed in an indoor-side chamber ( 21 ) while the outdoor heat exchanger ( 13 ) and the outdoor fan ( 14 ) is disposed in an outdoor-side chamber ( 22 ), the indoor-side chamber ( 21 ) and the outdoor-side chamber ( 22 ) being partitioned by a partition plate ( 20 ), characterized by further comprising an indoor fan casing ( 34 ) that is disposed between the indoor fan ( 12 ) and the partition plate ( 20 ) in the indoor-side chamber ( 21 ) and guides air flow induced by rotation of the indoor fan ( 12 ), and an electrical heater ( 55 ) disposed in the indoor-side chamber ( 21 ) for heating the air, wherein the indoor fan casing ( 34 ) has a heater lower-portion mounting portion ( 64 ) in which the lower portion of the electrical heater is mounted. 
     In the air conditioner, the heater lower-portion mounting portion ( 64 ) has a guide face ( 65 ) having a tapered shape that is upwardly increased in cross-sectional area from the lower end thereof to the upper end thereof. 
     The air conditioner further comprises a drain pan ( 33 ) for withdrawing water occurring on the indoor heat exchanger ( 11 ), wherein the electrical heater ( 55 ) is disposed to be above the drain pan ( 33 ) through the heater lower-portion mounting portion ( 64 ) and adjacent to the indoor heat exchanger ( 11 ), and the lower end portion of the electrical heater ( 55 ) is wholly covered by the heater lower-portion mounting portion ( 64 ). 
     In the air conditioner, the heater lower-portion mounting portion ( 64 ) of the indoor fan casing ( 34 ) is disposed to be spaced from the drain pan ( 33 ) at a predetermined distance. 
     According to a third aspect of the present invention, there is provided an air conditioner ( 10 ) including an indoor heat exchanger ( 11 ), an indoor fan device ( 12 ), an outdoor heat exchanger ( 13 ) and an outdoor fan device ( 164 ) which are integrally equipped, the indoor heat exchanger ( 11 ) and the indoor fan ( 12 ) being disposed in an indoor-side chamber ( 21 ) while the outdoor heat exchanger ( 13 ) and the outdoor fan ( 14 ) is disposed in an outdoor-side chamber ( 22 ), the indoor-side chamber ( 21 ) and the outdoor-side chamber ( 22 ) being partitioned by a partition plate ( 20 ), characterized in that the outdoor fan device ( 164 ) comprises an axial fan ( 14 ) for sucking the air at the suction side thereof and blowing out the air thus sucked to the outdoor heat exchanger ( 13 ) through rotation of the axial fan ( 14 ), and an air guide member disposed at the suction side of the axial fan ( 14 ) for guiding the air at the suction side of the axial fan to the axial fan. 
     In the air conditioner, the outdoor fan device ( 164 ) further comprises a driving motor ( 25 ) for driving the axial fan ( 14 ) and a support member ( 24 ) for supporting the driving motor ( 25 ), wherein the air guide member is fixed to the support member ( 24 ). 
     In the air conditioner, the air guide member comprises at least two air guide plates ( 161 , 162 ) that are equipped to the support member so as to be raised from the support member ( 24 ) at a predetermined angle, and air holes ( 159 ,  160 ) formed in the support member ( 24 ) in connection with the air guide plates ( 161 ,  162 ), the flow of the air at the suction side of the axial fan ( 14 ) being deflected to the air holes ( 159 ,  160 ) by the air guide plates ( 161 ,  162 ) and then sucked through the air holes ( 159 ,  160 ) into the axial fan ( 14 ). 
     In the air conditioner, the air guide plates ( 161 ,  162 ) are raised from the support member ( 24 ) substantially in the perpendicular direction to the air flow at the suction side of the axial fan. 
     In the air conditioner, the air guide plates ( 161 ,  162 ) are raised from the support member ( 24 ) so as to be inclined in a direction confronting the air flow direction at the suction side of the axial fan ( 14 ). 
     In the air conditioner, the air guide plates ( 161 ,  162 ) are integrally formed with the support member ( 24 ). 
     In the air conditioner, the whole or a part of each of the air guide plates ( 161 ,  162 ) is disposed within the outer peripheral edge of the axial fan. 
    
    
     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 of FIG. 1 when a cabinet is omitted from the illustration; 
     FIG. 3 is a longitudinally-sectional view showing the air conditioner shown in FIG. 1; 
     FIG. 4 is a plan view showing the air conditioner shown in FIG. 1 when a cabinet is omitted from the illustration; 
     FIG. 5 is an exploded perspective view showing a partition plate, a cross-flow fan, a ventilation device, etc. shown in FIG. 2; 
     FIG. 6 is a plan view corresponding to FIG. 4 when the ventilation device, etc. are installed; 
     FIG. 7 is a perspective view showing the arrangement of an indoor heat exchanger and a drain pan on a bottom plate; 
     FIG. 8 is an exploded perspective view showing the assembly of the parts of the air conditioner shown in FIG. 1; 
     FIG. 9 is a cross-sectional view showing the arrangement of an electrical heater on a heater lower-portion mounting portion of an indoor fan casing; 
     FIG. 10 is a perspective view showing an outdoor fan device; 
     FIG. 11 is an exploded perspective view showing the outdoor fan device shown in FIG. 10; 
     FIG. 12 is a front view taken in a direction of an arrow IX; and 
     FIG. 13 is a front view taken in the direction of the arrow IX when the rotational direction of a propeller fan is opposite to that of FIG.  12 . 
    
    
     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. 
     According to the air conditioner of the above-described embodiment, the ventilation can be excellently performed with a simple construction. 
     In the above embodiment, the ventilation shutter  49  of the ventilation device  47  is designed to be freely slidable. However, the ventilation shutter  49  may be fixed to the second top panel  42  of the partition  20  by screws or the like after the opening degree of the ventilation ports  48  is determined by the ventilation shutter  49 . 
     In the above-described air conditioner, the electric heater  55  disposed in the vicinity of the indoor heat exchanger  11  heats the indoor air which is sucked from the suction grille  40  by rotation of the cross-flow fan  12 , and blows out the indoor air thus heated as shown in FIG. 3, thereby heating the room. 
     The electrical heater  55  may be constructed by bridging one or plural heater wires between heater brackets  57  and  58  as shown in FIG.  8 . In this case, by supplying current to the heater wire(s)  56 , the heater wire(s) generate Joule heat and heats the air. The heater bracket  57  is fixed to one side face  61  of the partition plate  20  through a fixing bracket  59  by a screw or the like. 
     The partition plate  20  is designed in such a substantially box-shape so that the first top panel  41  and the second top panel  42  are connected to the upper side of a main panel  60  through which the indoor-side chamber  21  and the outdoor-side chamber  22  are compartmented, one side panel  61  is connected to one side of the main panel  60  and the other side panel  62  is connected to the other side of the main panel  60 . Further, an intermediate panel  63  is fixed to the main panel  62  between the one side panel  61  and the other side panel  62 . The indoor driving motor  35  disposed at the other end side of the cross-flow fan  12  is fixed to the intermediate panel  63 , one end side of the cross-flow fan  12  is fixed to one side panel  61 , and the cross-flow fan  12  and the indoor driving motor  35  are supported on the partition plate  35 . 
     The electrical heater  55  is supported on the partition plate  20  by fixing the heater bracket  57  to one side panel  61  of the partition plate  2  through the fixing bracket  59  as described above and fixing the heater bracket  58  to the intermediate panel  63  with a screw or the like. Under the condition that the electrical heater is assembled, the electrical heater  55  is located above the drain pan  33  as shown in FIG. 3, and the lower portion, that is, the lower end portion  55 A of the electrical heater  55  is mounted in a heater lower-end portion mount portion  64  of the indoor fan casing  34 . 
     As described above, the indoor fan casing  34  guides the stream of the air generated by the rotation of the cross-flow fan  12  so that the air successively flows through the suction grille  40 , the air filter  38 , the indoor heat exchanger  11 , the electrical heater  55 , the cross-flow fan  12  and the blow-out grille  43  in this order. As shown in FIGS. 3 and 5, the heater lower-portion mount portion  64  is integrally formed with the lower end portion of the indoor fan casing  34  extending to the drain pan  33  by bend-shaping or the like. The lower end portion  55 A of the electrical heater  55  is mounted in the heater lower-portion mount portion  64  so as to be wholly covered by the heater lower-portion mount portion  64 . Accordingly, the radiation heat of Joule heat generated by the electrical heater is intercepted by the heater lower-portion mount portion, and thus it is prevented from being transmitted to the drain pan  33  which is formed of foamed polystyrene, for example. 
     The lower end portion of each of the heater brackets  57  and  58  of the electrical heater  55  is tapered. Accordingly, the heater lower-portion mount portion  64  in which the lower end portions of the heater brackets  57  and  58  are mounted is designed to have a tapered guide face  65  which is upwardly gradually enlarged in cross-sectional area from the lower side to the upper side in the mount portion as shown in FIG.  9 . When the electrical heater  55  is lifted down from the upper side while suspended to install the electrical heater  55  in the air conditioner, the lower end portions of the heater brackets  57  and  58  abut against the guide face  65  and is guided along the guide face  65 , whereby the positioning of the electrical heater  55  can be quickly performed. 
     As shown in FIG. 9, the drain pan  33  has a recess portion  66  formed at the position where the heater lower-portion mount portion  64  of the indoor fan casing  34  is located. The recess portion  66  is designed to have the shape corresponding to the heater lower-portion mount portion  64 . Formation of the recess portion  66  in the drain pan  33  brings a gap T between the recess portion  66  of the drain pan  33  and the heater lower-portion mount portion  64  in which the lower end portion  55 A of the electrical heater  55  is mounted under the condition that the electrical heater  55  is installed. Existence of the gap T enables the drain water generated by the indoor heat exchanger  11  to flow along the surface of the drain pan  33  in the gap T. 
     Next, the installing process of the electrical heater  55  will be described hereunder. 
     First, as shown in FIG. 7, the drain pan  33  is first mounted on the bottom plate  16  and the indoor heat exchanger  11  is disposed on the drain pan  33 . 
     In parallel to the above step or after or before the above step, as shown in FIG. 5, the cross-flow fan  12  is disposed in the partition plate  20  and the ventilation shutter  49  is fixed to thereby fabricate a partition plate unit  67  as shown in FIG.  8 . Subsequently, the partition plate unit  67  is mounted on the bottom plate  16 . 
     Thereafter, as shown in FIG. 3, the electric heater  55  is lifted down from the upper side while suspended, and the lower end portion  55 A is guided along the guide surface of the heater lower-portion mount portion  64  of the indoor fan casing  34  to position the electrical heater  55 . Subsequently, the heater brackets  57 ,  58  of the electrical heater  55  are fixed to the one side panel  61  and the intermediate panel  63  of the partition plate  20  to thereby complete the installation of the electrical heater  55 . 
     The present invention is not limited to the above-described embodiment. For example, a guide face having a curved shape which is upwardly enlarged may be formed on the heater lower-portion mount portion  64  of the drain pan  33  in place of the upwardly enlarged tapered guide face  65 . 
     As described above, according to the above-described embodiment, the installation of the electrical heater can be enhanced. 
     In the above-described air conditioner, the propeller fan  14  serving as the outdoor fan shown in FIGS. 3 and 4 may be a type of axial fan, and it is rotated by the outdoor driving motor  25  mounted on the support leg  24  serving as a support member. The propeller fan  14 , the support leg  24  and the outdoor driving motor  25  constitute an outdoor fan device  164  serving as an axial fan device. The support leg  24  is disposed at the suction side of the propeller fan  14 , that is, it is disposed in the outdoor suction chamber  27 . 
     As described above, the outdoor-side chamber  22  is partitioned into the outdoor suction chamber  27  and the outdoor discharge chamber  26  by the outdoor fan casing  23 , and the propeller fan  14  and the outdoor heat exchanger  13  are disposed in the outdoor discharge chamber  26 . The air sucked by the propeller  14  is discharge to the outdoor heat exchanger  13 . 
     As shown in FIGS. 10 and 11, the upper end portion of the support leg  24  is fixed to the outdoor fan casing  23  by using screws  156 , and the lower end portion of the support leg  24  is fixed to the bottom plate  16  by using screws  157 . Further, the support leg  24  has a motor fixing hole  158  at the center thereof, an upper air hole  159  at the upper portion thereof and a lower air hole  160  at the lower portion thereof. In addition, the support leg  24  is equipped with an upper guide plate  161  and a lower guide plate  162  serving as guide members so that the upper and lower guide plates  161  and  162  are adjacent to the upper air hole  59  and the lower air hole  160 , respectively. 
     The support leg  24  having the motor fixing hole  58 , the lower air hole  60 , the upper guide plate  61  and the lower guide plate  62  is integrally formed by punching working and press working. The upper guide plate  61  and the lower guide plate  62  are disposed so as to be adjacent to the upper air hole  59  and the lower air hole  60  respectively, and also they are located at the downstream side of the air which flows at the back side of the outdoor fan casing  23  and the propeller fan  14  and at the outside of the support leg  24  (the upper guide plate  161  is disposed at the downstream side (left side) of the air flowing as indicated by arrows A 1  shown in FIG. 12, and the lower guide plate  162  is disposed at the downstream side (right side) of the air flowing as indicated by arrows A 2  shown in FIG.  12 ). 
     A part of the outdoor driving motor  25  is inserted in the motor fixing hole  158 , and the outdoor driving motor  25  is fixed to the support leg  24  by screws  163 , whereby the outdoor driving motor  25  is fixedly mounted on the support leg  24 . 
     The upper air hole  159  and the lower air hole  160  serve to guide to the propeller fan  14  the air at the outside of the support leg  24  in the outdoor suction chamber  27 . As shown in FIGS. 10 and 12, the upper guide plate  161  and the lower guide plate  162  have a first function of collecting the air flowing at the outside of the support leg  24  in the outdoor suction chamber  27  and guiding the air thus collected through the upper air hole  159  and the lower air hole  160  to the propeller fan  14 , and a second function described later. 
     That is, when viewed from the back side of the propeller fan  14 , in a case where the air in the outdoor suction chamber  27  is sucked by rotation of the propeller fan  14  in the right direction (the direction of an arrow α of FIGS. 10 and 12) and discharged to the outdoor heat exchanger  13  as indicated by the arrows A of FIG. 4, the air sucked from the outdoor suction port  28 A at the right side of FIG. 4 mainly flows to an upper half portion of the propeller fan  14  at the back side of the outdoor fan casing  23  and the propeller fan  14  as indicated by the arrows A 1  of FIGS. 10 and 12. In this case, a part of the air flows through the fan orifice  29  of the outdoor fan casing  23  and is directly sucked into the propeller fan  14 , and the other part of the air flows along the outside of the support leg  24 , and is collected by the inner surface  161 A of the upper guide plate  161  and then sucked through the upper air hole  159  into the propeller fan  14  (the first function of the upper guide plate  161 ). On the other hand, the air sucked from the outdoor suction port  28 B at the left side of FIG. 4 mainly flows to the lower half portion of the propeller fan  14  at the back side of the outdoor fan casing  23  and the propeller fan  14 . In this case, a part of the air flows through the fan orifice  29  and is directly ducked into the propeller fan  14 . The other part of the air flows along the outside of the support leg  24 , and is collected by the inner surface  162 A of the lower guide plate  162  and then sucked through the lower air hole  160  into the propeller fan  14  (the first function of the lower guide plate  62 ). 
     By the first function of the upper and lower guide plates  161  and  162 , the capture rate of the air flowing at the back side of the outdoor fan casing  23  and the propeller fan  14  by the propeller fan  14  is enhanced. Accordingly, even when the same level input electrical energy is applied to the outdoor driving motor for rotating the propeller fan  14 , the air blowing amount of the propeller fan  14  can be increased by about 5% as compared with the case where the upper guide plate  161  and the lower guide plate  162  are not equipped. 
     Further, a part of the air sucked from the outdoor suction port  28 A at the right side of FIG. 4 may flow to the lower half portion of the propeller fan  14  at the back side of the outdoor fan casing  23  and the propeller fan  14  as indicated by an arrow A 3  of FIG.  12 . The air thus flowing collides against the outer surface  162 B of the lower guide plate  162 , and the collision between the air flowing in the direction of the arrow A 3  and the air flowing in the direction of the arrows A 2  can be suppressed (the second function of the lower guide plate  162 ). 
     On the other hand, a part of the air sucked from the outdoor suction port  28 B at the left side of FIG. 4 may flow to the upper half portion of the propeller fan  14  at the back side of the outdoor fan casing  23  and the propeller fan  14  as indicated by an arrow A 4  of FIG.  12 . The air thus flowing collides against the outer surface  161 B of the upper guide plate  161 , and the collision between the between the air flowing in the direction of the arrow A 4  and the air flowing in the direction of the arrows A 1  can be suppressed (the second function of the upper guide plate  161 ). 
     By the second function of the upper guide plate  161  and the lower guide plate  162 , disturbance of the air flowing at the outside of the support leg  24  is reduced and the air flow is rectified, so that the air suction and discharge ambient noise (air blowing noise) by the propeller fan  14  can be reduced. 
     As shown in FIG. 12, the whole or a part of each of the upper and lower guide plates  161  and  162  is disposed within the outer peripheral edge  65  of the propeller fan  14 . Therefore, after the upper guide plate  161  and the lower guide plate  162  capture the air flowing at the outside of the support leg  24 , they can surely guide the air to the propeller fan  14 . 
     Further, the upper guide plate  161  and the lower guide plate  162  are disposed to be substantially perpendicular to the flowing direction of the air flowing at the outside of the support leg  24  (the direction of the arrow A 1  in the case of the upper guide plate  161 , and the direction of the arrow A 2  in the case of the lower guide plate  162 , or disposed to be inclined in a direction confronting the air flowing direction as indicated by a one-dotted chain line of FIG.  12 . Accordingly, the air capturing rate of the upper and lower guide plates  161  and  162  is enhanced. 
     In the embodiment, the upper guide plate  161  and the lower guide plate  162  formed on the support leg  24  may be formed to extend from the support leg  24  to a position close to the propeller fan  14 . 
     Further, in the above embodiment, the air at the back side of the outdoor fan casing  23  and the propeller fan  14  is sucked into the propeller fan  14  through the rotation of the propeller fan  14  in the direction of the arrow α shown in FIGS. 10 and 12. However, the present invention may be applied to a case where the angles of the vanes of the propeller  14  are changed to make it possible to suck the air at the back side of the outdoor fan casing  23  and the propeller fan  14  into the propeller  14  through the rotation of the propeller fan  14  in the opposite direction (the direction of an arrow β of FIG. 10) to the direction of the arrow α. In this case, the directions (arrows A 1 , A 2 , A 3 , A 4 ) of the air flowing at the back side of the outdoor fan casing  23  and the propeller fan  14  are changed to the respective opposite directions (arrows B 1 , B 2 , B 3 , B 4 ). Therefore, as shown in FIG. 13, the upper guide plate  161  is disposed to be adjacent to the right side of the upper air hole  159 , and the lower guide plate  162  is disposed to be adjacent to the left side of the lower air hole  160 . 
     Further, in the above-described embodiment, the axial fan device is an outdoor fan device  64  of an air conditioner  10 . However, the present invention may be applied to other types of devices each having an axial fan such as a propeller fan or the like, for example, an exhaust fan or the like. 
     In the above-described embodiment, two guide plates  161 ,  162  are equipped to the support leg  24 . However, the number of guide plates is not limited to two, and it may be set to any number of three or more insofar as the guide plates have the first and second functions. 
     According to the axial fan device described above and the air conditioner having the axial fan device, the fan discharge amount can be increased. 
     As described above, according to the present invention, the following effects (1) to (17) can be achieved. 
     (1) The ventilation shutter  49  that is freely slidably mounted on the second top panel  42  of the partition plate opens/closes the ventilation ports  48  formed in the second top panel  42  to adjust the opening degree of the ventilation ports  48 , and introduces the outside air flowing into the outdoor-side chamber  22  into the indoor-side chamber  21  through the ventilation ports  48  whose opening degree is determined (that is, the flow amount of the outside air to be introduced into the indoor-side chamber is adjusted). Therefore, the construction can be simplified and the number of parts can be reduced as compared with the conventional case where the ventilation port of the partition plate is opened/closed by the ventilation door using the hinge. 
     (2) The opening degree of the ventilation ports  48  in the second top panel  42  of the partition plate  20  can be adjusted by controlling the sliding position of the ventilation shutter  49 . Therefore, the ventilation amount of the outside air through the ventilation ports  48  can be freely controlled. 
     (3) The surrounding of the outdoor-side chamber  22  is compartmented by the sleeve-shaped cabinet  19 , and the second top panel  42  of the outdoor-side chamber  22  is disposed inside the cabinet  19 , so that the outside air flows through the outdoor-side chamber  22  in the cabinet  19 , and is guided and introduced into the ventilation ports  48  of the partition plate  20  by the cabinet  19 . Therefore, the ventilation through the ventilation ports  48  can be excellently performed by existence of the cabinet  19 . 
     (4) The second top panel  42  of the partition plate  20  is designed to be downwardly inclined to the outdoor-side chamber ( 22 ) side, and thus the fluid flow area of the outside air flowing through the ventilation ports  48  of the second top panel  42  of the partition plate  20  can be increased, so that the ventilation through the ventilation ports  48  can be excellently performed. 
     (5) The indoor fan casing  34  is disposed between the partition plate  20  and the cross-flow fan  12  in the indoor-side chamber  21 , the ventilation aeration portions  50 A are formed at the lower portion of the indoor fan casing  34 , and the outside air introduced from the ventilation ports  48  of the partition plate  20  into the outside air introducing chamber  37  of the indoor-side chamber  21  is guided through the aeration ports  50  of the ventilation aeration portions  50 A into the indoor circulating chamber  36  in which the cross-flow fan  12  is disposed. Therefore, even when strong wind and rain (the weather such as hurricane or the like are introduced from the ventilation ports  48  of the partition plate  20  into the outside air introducing chamber  37  of the indoor-side chamber  21 , water droplets of rain collide against the surface at the outside air introducing chamber ( 37 ) side of the indoor fan casing  34  and fall down. Therefore, the rain water droplets can be prevented from invading through the ventilation aeration portions  50 A of the indoor fan casing  34  into the indoor circulating chamber ( 36 ) side of the indoor fan casing  34 , and thus invasion of rain into the room can be prevented. 
     (6) When the wet outside air is passed through the opened ventilation ports  48  and introduced into the indoor-side chamber  21  under the condition that the cross-flow fan  12 , etc. are cooled under cooling operation, moisture in the outside air collides against the surface at the outside air introducing chamber ( 37 ) side of the indoor fan casing  34  and falls down, so that the outside air from which the moisture is removed is passed through the aeration ports  50  of the ventilation aeration portions  50 A of the indoor fan casing  34  and then introduced into the indoor circulating chamber  36  of the indoor-side chamber  21 . Therefore, there can be prevented such a phenomenon that the moisture in the outside air is attached and condensed onto the cross-flow fan  12  and the surface at the indoor circulating chamber ( 36 ) side of the indoor fan casing  34  which are kept under a low temperature, so that dew thus occurring can be prevented from scattering into the room. 
     (7) A large number of fine holes that are smaller in diameter than the opening area of the ventilation ports  48  of the partition plate  20  are formed in the ventilation shutter  49 , and these fine holes of the ventilation shutter  49  can function as filters. Therefore, for example, it is unnecessary to separately provide an insect screening net or the like to prevent invasion of insects, so that the number of parts can be further reduced. 
     (8) The operating lever  54  is disposed on the ventilation shutter  49  so as to extend to the indoor heat exchanger  11 . Therefore, a user can manipulate the operating lever  54  in the room to slide the ventilation shutter  49  and adjust the opening degree of the ventilation ports  48 , so that the operability of the ventilation can be enhanced. 
     (9) The indoor fan casing  34  is equipped with the heater lower-portion mount portion  64  in which the lower end portion  55 A of the electrical heater  55  can be mounted. Therefore, even if any positional displacement occurs in the electrical heater  55  when the electrical heater  55  is installed, the lower end portion  55 A of the electrical heater  55  can be mounted in the heater lower-portion mount portion  64 , so that the positioning of the electrical heater  55  can be performed and thus the installation performance of the electrical heater  55  can be enhanced. 
     (10) The heater lower-portion mount portion  64  is equipped with the tapered guide face  65  which is upwardly enlarged in cross-sectional area from the lower side to the upper side. Therefore, when the electrical heater  55  is installed, the lower end portion  55 A of the electrical heater  55  can be smoothly mounted in the heater lower-portion mount portion  64  by moving the lower end portion  55 A of the electrical heater  55  along the guide face  65 . Accordingly, the positioning of the electrical heater  55  can be quickly performed, and the installation of the electrical heater  55  can be enhanced. 
     (11) The heater lower-portion mount portion  64  of the indoor fan casing  34  is designed so that the lower end portion  55 A of the electrical heater  55  can be wholly covered and mounted in the heater lower-portion mount portion  64 . Therefore, the radiation heat from the electrical heater  55  can be intercepted by the heater lower-portion mount portion  64 , and it can be prevented from being directly transmitted to the drain pan  33 . Therefore, the recess portion  66  of the drain pan  33 , which is formed of formed polystyrene for example, can be prevented from being thermally deformed by the radiation heat of the electrical heater  55 . 
     (12) The recess portion  66  is formed at the position corresponding to the heater lower-portion mount portion  64  of the drain pan  33 , and the heater lower-portion mount portion  654  of the indoor fan casing  34  is disposed so that the gap T is kept between the heater lower-portion mount portion  64  and the recess portion  66  of the drain pan  33 . Therefore, the drain water occurring on the indoor heat exchanger  11  can flow through the gap T on the drain pan  33 , and thus the flow of the drain water can be smoothened. 
     (13) The support leg  24  located at the suction side of the propeller fan  14  is equipped with the upper guide plate  161  and the lower guide plate  162  for guiding the air flowing at the outside of the support leg  24  to the propeller fan  14 . Accordingly, the capturing rate of the air flowing at the outside of the support leg  24  is enhanced by the action of the upper guide plate  161  and the lower guide plate  162 , and the air can be smoothly sucked into the propeller fan  14 . Therefore, even when the same input electrical energy is applied to the outdoor driving motor  25 , the air blowing amount by the propeller fan  14  can be increased by about 5%, for example. 
     (14) Since the air flowing at the outside of the support leg  24  can be rectified by the action of the upper guide plate  161  and the lower guide plate  162 , the ambient noise (air blowing noise) when the air is sucked and discharged by the propeller  14  can be reduced. 
     (15) The upper guide plate  161  and the lower guide plate  162  are integrally formed with the support leg  24  for supporting the outdoor driving motor  25  by punching working and press working, so that the upper guide plate  161  and the lower guide plate  162  can be remarkably easily formed. 
     (16) The whole or a part of each of the upper guide plate  161  and the lower guide plate  162  is disposed within the outer peripheral edge  165  of the propeller fan  14 , so that the upper and lower guide plates  161  and  162  can surely guide the air flowing at the suction side of the propeller fan  14  and at the outside of the support leg  24  to the propeller fan  14 . 
     (17) The upper guide plate  161  and the lower guide plate  162  are disposed to be substantially perpendicular to the flow of the air at the outside of the support leg  24  at the suction side of the propeller fan  14 , or disposed to be inclined in the direction confronting the air flow direction. Therefore, the air at the suction side of the propeller can be surely captured by the upper guide plate  161  and the lower guide plate  162  and guided to the propeller fan  14 .