Air conditioner

Abstract: Inside a blown-out air duct in the air conditioner through which conditioned air reaches a blowing-out port there is provided a rectifying box having a air passage therein, for rectifying a flow of the conditioned air toward a predetermined flowing direction in order to prevent any dew condensation at the blowing-out port in the air conditioner. In the meantime, in order to suppress noise, rectifying plates (44) for reducing an inflowing angle of air flowing into the fin tips of a heat exchanger (37) are interposed between an axial fan (40) and the heat exchanger (37) for taking in the air from the axial fan (40) for heat exchanging.

Description: The present invention relates to an air conditioner and, more particularly, to rectification of an airflow in an air conditioner. Fig. 8 is a side cross-sectional view showing a conventional window type air conditioner which is installed on a wall. In Fig. 8, reference numeral 31 designates a casing of the air conditioner, the inside of which is divided into an exterior side and an interior side by a partition plate 32; 33, an exterior suction port through which exterior air is sucked from the exterior of a room; 34, an exterior blowing-out port, through which air is blown out to the exterior of the room; 35, an interior suction port, through which interior air is sucked from the interior of the room; 36, an interior blowing-out port, through which air is blown out to the interior of the room; 37, an exterior heat exchanger disposed in the vicinity of the exterior blowing-out port 34 inside the casing 31; 38, an interior heat exchanger disposed in the vicinity of the interior suction port 35 inside the casing 31; 39, an electric motor for blowing, disposed on the exterior side; 40, an axial fan interposed between the exterior heat exchanger 37 and the electric motor 39 and connected to the electric motor 39; 40a, a blade fixing portion (i.e., a boss), to which a blade of the axial fan 40 is fixed; 41, a sirocco fan interposed between the interior heat exchanger 38 and the electric motor 39 and connected to the electric motor 39; 42, a fan cover disposed around the axial fan 40; and 43, a compressor constituting a refrigerant cycle together with the exterior heat exchanger 37 and the interior heat exchanger 38. In the air conditioner such constituted as described above, the electric motor 39 drives to rotate the axial fan 40 on the exterior side, so as to suck the exterior air through the exterior suction port 33. The exterior air is sucked into the axial fan 40, and then, is blown out of the exterior blowing-out port 34 through the exterior heat exchanger 37. Moreover, the electric motor 39 drives to rotate the sirocco fan 41 on the interior side, so as to suck the interior air through the interior suction port 35. The interior air is sucked into the sirocco fan 41 through the interior heat exchanger 38, and then, is blown out of the interior blowing-out port 36. In the conventional air conditioner such constituted as described above, the exterior heat exchanger 37 is greater in size than the outer diameter of the axial fan 40, and further, the exterior heat exchanger 37 and the axial fan 40 are arranged in close proximity to each other. Consequently, inflowing air at the fin tips of the exterior heat exchanger 37 placed apart from the outer diameter of the axial fan 40 flows as illustrated in Fig. 9. That is, an angle  between the fin and the inflowing airflow is large, thus raising the problems that the inflowing air is liable to be separated from the fins and noise is likely to occur. Additionally, since no air flows at the rear end 50 of the boss 40a of the axial fan 40, the inflowing air flows into the fin tips facing the boss 40a with a large inflowing angle, thereby raising problems similar to those described above. The present invention has been accomplished in an attempt to solve problems observed in the prior art. An object of the present invention is to provide an air conditioner in which an airflow inside the air conditioner is rectified with simple configuration, thus maintaining blowing performance and suppressing noise. According to the present invention, an air conditioner including an axial fan for blowing air and a heat exchanger having cooling fins for taking in the air blown by the axial fan so as to perform heat exchanging, comprises rectifying means interposed between the axial fan and the heat exchanger, for reducing an inflowing angle of air flowing into the fin tips of the heat exchanger. Thus, it is possible to reduce the angle between fins of the heat exchanger and the flow of the inflowing air so as to hardly separate the inflowing air from the fins, thereby suppressing occurrence of noise. The rectifying means may be attached to the heat exchanger. Consequently, the air conditioner can be easily assembled after the rectifying means is attached. The rectifying means may be fixed to a portion except the heat exchanger. Therefore, assembling workability can be enhanced more than the case where the rectifying means is attached to the heat exchanger. The rectifying means may be disposed at a portion except a projection area of the axial fan onto the heat exchanger. Thus,. it is possible to reduce the angle between the fin and the flow of the inflowing air at the portion except the projection area of the axial fan onto the heat exchanger so as to hardly separate the inflowing air from the fins, thereby suppressing occurrence of noise. The axial fan may include a blade fixing portion for fixing a blade at substantially the center thereof, and the rectifying means may be disposed within a projection area of the blade fixing portion onto the heat exchanger. Therefore, it is possible to suppress an increase of an inflowing angle of the inflowing air at the fin tips facing the blade fixing portion, which is caused by no airflow at the rear end of the blade fixing portion, and to reduce noise because of less separation of the air. The rectifying means may be constituted of a flat rectifying plate. Consequently, it is possible to manufacture the rectifying means at a reduced cost. The rectifying means may be constituted of a rectifying plate inclined on the suction side thereof toward the axial fan. Therefore, it is possible to reduce the inflowing angle of the air flowing into the fin tips of the heat exchanger so as to enhance the effect of suppressing noise. In an air conditioner including an axial fan for blowing air and a heat exchanger having cooling fins for taking in the air blown by the axial fan so as to perform heat exchanging, the fins are inclined on the suction side thereof toward the axial fan. Thus, it is possible to reduce the angle between the fins of the heat exchanger and the inflowing airflow so as to hardly separate the inflowing air from the fins, thereby suppressing occurrence of noise, and to dispense with another rectifying means so as to reduce the number of component parts. Additionally, it is possible to eliminate detaching work of the rectifying means at the time of recycling, and further, the fins are excellent in recycling property since the fins are made of aluminum. The fins may be inclined on the suction side thereof toward the axial fan at a portion except a projection area of the axial fan onto the heat exchanger. Thus, it is possible to reduce the angle between the fins and the inflowing airflow at the portion except the projection area of the axial fan so as to hardly separate the inflowing air, thereby suppressing occurrence of noise. The axial fan may include a blade fixing portion for fixing a blade at substantially the center thereof, and the fins may be inclined on the suction side thereof toward the blade within a projection area of the blade fixing portion onto the heat exchanger. Therefore, it is possible to suppress an increase in inflowing angle of the inflowing air at the fin tips facing the blade fixing portion, which is caused by no airflow at the rear end of the blade fixing portion, and to reduce noise because of less separation of the air. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side cross-sectional view showing a window type air conditioner installed on a wall in a first embodiment,according to the present invention; Fig. 2 is a perspective view illustrating the state in which a rectifying plate is installed in the first embodiment; Fig. 3 is a view illustrating an airflow with aid of the rectifying plate in the first embodiment; Fig. 4 is a side cross-sectional view showing a window type air conditioner installed on a wall in a second embodiment, according to the present invention; Fig. 5 is a view illustrating an airflow with aid of the rectifying plate in the second embodiment; Fig. 6 is a side cross-sectional view showing a window type air conditioner installed on a wall in a third embodiment, according to the present invention; Fig. 7 is a view illustrating an airflow into a heat exchanger in the third embodiment; Fig. 8 is a side cross-sectional view showing a conventional window type air conditioner installed on a wall; and Fig. 9 is a view illustrating an airflow in the conventional window type air conditioner. Throughout the embodiments explained hereunder, competent parts like or corresponding to those of the air conditioner in the prior art are denoted by the same reference numerals, and the description thereof will be omitted to avoid duplication. First Embodiment Figs. 1 to 3 illustrate a first embodiment, according to the present invention, in which Fig. 1 is a side cross-sectional view illustrating the state in which a domestic window type air conditioner is installed on a wall; Fig. 2 is a perspective view illustrating the state in which a rectifying plate is fixed; and Fig. 3 is a diagram illustrating an airflow by the rectifying plate. Here, reference numeral 44 designates a flat rectifying plate which is one example of rectifying means, provided at a suction portion of an exterior heat exchanger 37 in order to reduce an inflowing angle of an inflowing airflow at fin tips of the exterior heat exchanger 37. The rectifying plate 44 is provided at the suction portion of the exterior heat exchanger 37 except a projection area of an axial fan 40 in order to solve the problem that the inflowing air at the fin tips of the exterior heat exchanger 37 apart from the outer diameter of the axial fan 40 is liable to be separated from the fins due to a large inflowing angle  between the fins and the inflowing so as to generate noise, in the conventional air conditioner. Furthermore, since in the conventional air conditioner no air flows at the rear end 50 of a boss 40a of the axial fan 40, the inflowing angle of the inflowing air at the fin tips facing the boss 40a also becomes large, so that the inflowing air is liable to be separated from the fins, thereby generating noise. In order to solve the problem experienced in the prior art, a rectifying plate 44 is provided at the suction portion of the exterior heat exchanger 37 within the projection area of the boss 40a of the axial fan 40. In the air conditioner such configured as described above, the axial fan 40 is driven to be rotated by an electric motor 39, so that exterior air is sucked from an exterior suction port 33 into the axial fan 40. In this case, the rectifying plate 44 provided at the suction portion of the exterior heat exchanger 37 except the projection area of the axial fan 40 or at the suction portion of the exterior heat exchanger 37 within the projection area of the boss 40a of the axial fan 40, rectifies the inflowing air into the exterior heat exchanger 37 at the fin tips of the exterior heat exchanger 37 in such a manner as to reduce the angle  between the fin and the inflowing air, and then, allow the inflowing air to be blown out of a blowing-out port 34 through the exterior heat exchanger 37. In the above-described embodiment, the rectifying plate 44 is provided at the suction portion of the exterior heat exchanger 37 except the projection area of the axial fan 40 or at the suction portion of the exterior heat exchanger 37 within the projection area of the boss 40a of the axial fan 40, so that the inflowing air at the fin tips of the exterior heat exchanger 37 is rectified in such a manner as to reduce the angle  between the fin and the inflowing air, thus producing the effects that the inflowing air is hardly separated. Therefore, noise can be reduced. Although the present embodiment has been described by way of the example in which the rectifying plates 44 is provided at the suction portion of the exterior heat exchanger 37 except the projection area of the axial fan 40 or at the suction portion of the exterior heat exchanger 37 within the projection area of the boss 40a of the axial fan 40, the rectifying plate 44 may be provided at an appropriate position of the suction portion of the exterior heat exchanger 37 as long as the angle  of the inflowing air can be reduced. In the above-described first embodiment, the workability is not always excellent since the rectifying plate 44 is attached directly to a fin of the exterior heat exchanger 37. However, there is an advantage that the assembling performance of the air conditioner becomes excellent after the rectifying plate 44 is attached. Although the shape of the rectifying plate 44 is flat in the first embodiment, it is not limited to this. For example, the rectifying plate 44 may be formed into such a shape as described below in a second embodiment. Second Embodiment Figs. 4 and 5 illustrate a second embodiment, according to the present invention, in which Fig. 4 is a side cross-sectional view illustrating the state in which a domestic window type air conditioner is installed on a wall; and Fig. 5 is a diagram illustrating an airflow by a rectifying plate. Here, reference numeral 45 designates the rectifying plate which is one example of rectifying means for reducing an inflowing angle of an inflowing airflow at the fin tips of the exterior heat exchanger 37, the rectifying plate being interposed between an exterior heat exchanger 37 and an axial fan 40, fixed to a portion except the exterior heat exchanger 37, and bent on the suction side thereof toward the axial fan 40. The rectifying plate 45 is disposed in the vicinity of a suction portion between the axial fan 40 and the exterior heat exchanger 37 except a projection area of the axial fan 40. Since the rectifying plate 45 is interposed between the exterior heat exchanger 37 and the axial fan 40 but is not fixed to the exterior heat exchanger 37, the rectifying plate 45 need not be fixed to the fins of the exterior heat exchanger 37 so as to enhance fixing workability of the rectifying plate 45, unlike the fourth embodiment. In the air conditioner such configured as described above, the axial fan 40 is driven to be rotated by an electric motor 39, so that exterior air is sucked from an exterior suction port 33 into the axial fan 40, and then the rectifying plate 45 rectifies the inflowing airflow in such a manner as to reduce the inflowing angle  of the inflowing airflow at the fin tips of the exterior heat exchanger 37, and then, allows the inflowing airflow to be blown out of a blowing-out port 34 through the exterior heat exchanger 37. In the above-described embodiment, the rectifying plate 45 is provided in the vicinity of the suction portion of the exterior heat exchanger 37 except a projection area of the axial fan 40 between the exterior heat exchanger 37 and the axial fan 40, so that the inflowing airflow at the fin tips of the exterior heat exchanger 37 is rectified in such a manner as to reduce the angle  between the fins and the inflowing airflow, thus producing the effects that the inflowing airflow is hardly separated from the fins and noise can be reduced. Although the rectifying plate 45 is bent on the suction side thereof toward the axial fan 40 in the present embodiment, it may be formed into a flat shape. Moreover, the rectifying plate 45 may be disposed in the vicinity of the suction portion of the exterior heat exchanger 37 within the projection area of the boss 40a of the axial fan 40 between the exterior heat exchanger 37 and the axial fan 40. Consequently, it is possible to suppress an increase in inflowing angle of the air at the fin tips facing the boss 40a, caused by no air flows at the rear end of the boss 40a of the axial fin 40. Third Embodiment Figs. 6 and 7 illustrate a third embodiment, according to the present invention, in which Fig. 6 is a side cross-sectional view illustrating the state in which a domestic window type air conditioner is installed on a wall; and Fig. 7 is a diagram illustrating an airflow flowing into a heat exchanger. Here, as shown in Fig. 7, the fin tips of an exterior heat exchanger 37 at a portion except a projection area of an axial fan 40 are inclined toward the axial fan 40. In the air conditioner such configured as described above, the axial fan 40 is driven to be rotated by an electric motor 39, so that exterior air is sucked from an exterior suction port 33 into the axial fan 40. Thereafter, since the fin tips of the exterior heat exchanger 37 at the portion except the projection area of the axial fan 40 are inclined toward the axial fan 40, an inflowing airflow is blown out of a blowing-out port 34 without any separation from the exterior heat exchanger 37. The fin tips of the exterior heat exchanger 37 are inclined toward the axial fan 40, thereby reducing the angle  between the inflowing airflow and the fin, as shown in Fig. 7. In the above-described embodiment, it is possible to dispense with the rectifying plate described in the first and second embodiments, thus reducing the number of component parts. Additionally, it is possible to eliminate detaching work of the rectifying plate at the time of recycling, and further, the fins are excellent in recycling property since the fins are made of aluminum. As shown in Fig. 7, it is more effective to incline, toward the blade of the axial fan 40, also the fin tips of the exterior heat exchanger 37 within the projection area of the boss 40a of the axial fan 40. The fin tips of the exterior heat exchanger.37 within the projection area of the boss 40a are inclined toward the blade of the axial fan 40, thereby suppressing an increase in inflowing angle of the airflow at the fin tips facing the boss 40a, caused by no airflow at the rear end of the boss 40a of the axial fan 40.

Claims: An air conditioner including an axial fan (40) for blowing air and a heat exchanger (37) having cooling fins for taking in the air blown by said axial fan (40) so as to perform heat exchanging, said air conditioner characterized in that comprises: rectifying means (44,45) interposed between said axial fan (40) and said heat exchanger (37), for reducing an inflowing angle of air flowing into the tips of the cooling fins of said heat exchanger (37). An air conditioner as claimed in claim 1 , characterized in that said rectifying means (44) is attached to said heat exchanger (37). An air conditioner as claimed in claim 1 , characterized in that said rectifying means (45) is fixed to a portion except said heat exchanger (37). An air conditioner as claimed in claim 1, characterized in that said rectifying means (44) is disposed at a portion except a projection area of said axial fan (40) onto said heat exchanger (37). An air conditioner as claimed in claim 1 , characterized in that said axial fan (40) includes a blade fixing portion (40a) for fixing a blade at substantially the center thereof, and said rectifying means (44) is disposed within a projection area of said blade fixing portion (40a) onto said heat exchanger (37). An air conditioner as claimed in claim 1, characterized in that said rectifying means (44) is constituted of a flat rectifying plate. An air conditioner as claimed in claim 1 , characterized in that said rectifying means (45) is constituted of a rectifying plate inclined on the suction side thereof toward said axial fan (40). An air conditioner including an axial fan (40) for blowing air and a heat exchanger (37) having cooling fins for taking in the air blown by said axial fan (40) so as to perform heat exchanging, characterized in that some of said fins are inclined on the suction side thereof toward said axial fan (40). An air conditioner as claimed in claim .8, characterized in that some of said fins are inclined on the suction side thereof toward said axial fan (40) at a portion except a projection area of said axial fan (40) onto said heat exchanger (37). An air conditioner as claimed in claim 8, characterized in that said axial fan (40) includes a blade fixing portion (40a) for fixing a blade at substantially the center thereof, some of said fins being inclined on the suction side thereof toward said blade within a projection area of said blade fixing portion (40a) onto said heat exchanger (37).

Inventors: FUKAZAWA HIROSHI, ISHIKAWA HIROAKI, KITAMURA JUN, MASAKAZU KONDOU, MURAYAMA TAKAHIRO, SANO MOTOO, SUZUKI SHINICHI, TAKAMORI AKIRA, FUKAZAWA, HIROSHI, ISHIKAWA, HIROAKI, KITAMURA, JUN, MASAKAZU, KONDOU, MURAYAMA, TAKAHIRO, SANO, MOTOO, SUZUKI, SHINICHI, TAKAMORI, AKIRA, Fukazawa, Hiroshi,c/o Mitsubishi Denki K.K., Ishikawa, Hiroaki, c/o Mitsubishi Denki K.K., Kitamura, Jun, c/o Mitsubishi Denki K.K., Masakazu, Kondou, c/o Mitsubishi Denki K.K., Murayama, Takahiro, c/o Mitsubishi Denki K.K., Sano, Motoo, c/o Mitsubishi Denki K.K., Suzuki, Shinichi, c/o Mitsubishi Denki K.K., Takamori, Akira, c/o Mitsubishi Denki K.K.
Applicants: MITSUBISHI ELECTRIC CORP, MITSUBISHI DENKI KABUSHIKI KAISHA
Application year: 1999
Main classification: F24F1
IPC codes: F24F13, F24F1