Air cleaning apparatus and construction of clean room with the same
This is a continuation of application Ser. No. 867,623 filed May 27, 1986 which in turn is a continuation of application Ser. No. 778,730 filed Sept. 20, 1985, which is continuation of 06/506,541 filed June 21, 1983 now abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     This invention relates to an air cleaning apparatus for a dust-free and sterile clean room necessary for general industrial, food industrial and dangerous article handling fields as well as the construction of a clean room with the air cleaning apparatus. 
     Heretofore, there is an air cleaning apparatus for a clean room, having an air diffuser exit and an air suction port respectively provided at upper and lower ends, an air circulation blower, air cleaning filter and/or an air conditioner as required. This conventional apparatus is disposed at a suitable position in the room to clean the air in the room. According to the structure of the apparatus, the area of the clean air diffuser exit is small and hence the circulation of the clean air is insufficient in the apparatus. Thus, it is not sufficient to clean the air in the room and is difficult to obtain a sufficiently clean room. 
     Further, in the construction of the conventional air cleaning apparatus in a clean room, an air duct is arranged in a ceiling or in the wall, an air diffuser port is formed on the ceiling or on the surface of a wall, and the clean air from the air cleaning apparatus is fed through the duct and the air diffuser port into the room to be cleaned. In this arrangement, the area of the clean air diffuser port is sufficiently constructed, but it is necessary to arrange the duct in the ceiling or in the wall. In addition, it is also necessary to form the clean air diffuser port on the surface of the ceiling or on the surface of the wall. Accordingly, the construction of the air cleaning apparatus in the clean room is complicated. Particularly, when the clean room is provided in the building already built, the ceiling and the wall of the building must be broken to arrange the duct and to form the clean air diffuser port. Therefore, the term of the construction becomes long and expensive. 
     SUMMARY OF THE INVENTION 
     Accordingly, an object of the present invention is to provide an air cleaning apparatus which can form an air clean room simply and rapidly entirely regardless of the size and the shape of a room to be cleaned and which can be easily installed in an existing building. 
     Another object of the present invention is to provide an air cleaning apparatus which can facilitate the inspection and the maintenance after installation thereof. 
     Still another object of the present invention is to provide an air cleaning apparatus which can accommodate a sufficiently large clean air diffuser port to provide sufficient clean air. 
     Still another object of the invention is to provide a construction process utilizing the air cleaning apparatus which enables simple construction of a clean room even in an already-built building, thereby largely reducing the time and expenses of construction. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The above and other related objects and features of the invention will be apparent from a reading of the following description of the disclosure found in the accompanying drawings and the novelty thereof pointed out in the appended claims. 
     FIG. 1 is a front view of a preferred embodiment of an air cleaning apparatus for a clean room constructed according to the present invention; 
     FIG. 2 is a side view of the apparatus in FIG. 1; 
     FIG. 3 is a sectional view showing an example of an air duct of the apparatus; 
     FIG. 4 is a sectional view of another example of the duct; 
     FIGS. 5 to 7 are views showing other preferred embodiments of the air cleaning apparatus of the invention, wherein FIG. 5 shows a T-shaped arrangement, FIG. 6 shows an inverted U-shaped arrangement, and FIG. 7 shows an inverted E-shaped arrangement; 
     FIGS. 8 to 10 are explanatory views of the construction of the air cleaning apparatus of the invention, wherein FIG. 8 shows a schematic sectional view of the clean room arranged with the air cleaning apparatus of the invention, FIG. 9 shows a side view of the clean room, and FIG. 10 shows a plan view of the clean room; and 
     FIGS. 11 and 12 are schematic plan views of the preferred examples of the clean room installed with the air cleaning apparatus of the invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The present invention will now be described in more detail with reference to the accompanying drawings. 
     In FIGS. 1 and 2, the air cleaning apparatus 1 of one preferred embodiment of the present invention comprises and air suction port 2 formed at the bottom, a blower 3 provided above the suction port 2 for circulating the air, a columnar body 5, an air cleaning filter 4 installed as a duct collector above the blower 3 in the body 5, and an air duct 7 having clean air diffuser exits 6 formed at the side and lower surfaces of the body 5 and horizontally extending perpendicularly from the end of the body 5. 
     As shown in FIGS. 3 and 4, the duct 7 is formed in an inverted trapezoidal shape in cross section cut at both sides in a tapered shape, or in an inverted trapezoidal shape in cross section cut at one side in a tapered shape. The shape of the duct 7 in cross section depends upon the arrangement of the air cleaning apparatus 1 in the clean room. 
     The diffuser exits 6 are formed substantially over the entire surfaces of the side and lower faces of the duct 7, thereby sufficiently diffusing the clean air fed from the diffuser exits 6. 
     More particularly, the diffuser exits 6 are formed with porous plates at the side and lower faces of the duct 7. The duct 7 is clamped at the sides and lower part with screws 10 or hinge in a removable or openable structure, thereby facilitating the inspection and maintenance in the duct. 
     In the embodiment described above, the air cleaning filter 4 is installed in the body 5 above the blower 3. However, it is not limited only to this arrangement. For example, the filter 4 may also be arranged in the vicinity of the inlet of the end of the duct 7 or in the vicinity of the air diffuser exits 6. 
     The air cleaning apparatus 1 which is composed of the columnar body 5 and the duct 7 can be constructed in various shapes such as an inverted L shape in which the duct 7 extends in one side direction from the body 5 as shown in FIG. 1, a T shape in which the duct 7 extends at both sides as shown in FIG. 5, an inverted U shape in which the duct 7 extends in suspension between two columnar bodies as shown in FIG. 6, or an inverted E shape in which the duct 7 extends in suspension between three columnar bodies as shown in FIG. 7. The shape of the apparatus 1 may be adequately selected depending upon the shape and the size of the room to be cleaned. 
     Since food industry clean rooms must have dust-free and sterile clean air, it is preferred to provide a sterilizer 5 (FIG. 2) or a pasteurizer after the filter 4 or in the vicinity of the duct 7. Further, one may also install an air conditioner in the body 5 as required. 
     The operation for cleaning the room to be cleaned of the air cleaning apparatus constructed according to the present invention as described above will now be described. 
     The air in the room to be cleaned is sucked by the blower 3 from the air suction port 2 into the body 5, and then fed through the filter 4 where dust is removed from the air. Where a sterilizer or pasteurizer is provided, the air is subsequently passed through the sterilizer or pasteurizer to be pasteurized. The clean air thus treated is then fed into the duct 7 from the air cleaning apparatus 1. The clean air with dust and bacteria removed is fed through the diffuser exits 6 into the room to be cleaned. 
     The air thus fed into the room to be cleaned is again sucked into the body 5 and recirculated in the air cleaning apparatus 1 in the same manner as described above. Thus the air in the room is continuously cleaned. 
     The construction of the clean room with the air cleaning apparatus according to the present invention will now be described. 
     FIGS. 8, 9 and 10 show preferred embodiments of the construction of the air cleaning apparatus 1 of the inverted U shape shown in FIG. 6 in the room to be cleaned. The apparatuses 1 are respectively arranged at four corners and at the center side of a room R. 
     The bodies 5 of the respective apparatuses 1 are clamped to the wall surfaces 8 by simple means such as bolts and nuts. The ducts 7 extends along the lower surface of a ceiling 9. The air cleaning apparatuses 1 are designed in advance so that the size of the body 5 and the ducts 7 are adapted for the height of the ceiling 9 and the size of the room R. 
     In the embodiments described above, the air cleaning apparatus 1a arranged at four corners of the room is of the type having the section of the duct 7 in the inverted trapezoidal shape with a tapered side shown in FIG. 4. The air cleaning apparatus 1b arranged at the center side is of the type having the section of the duct 7 in the inverted trapezoidal shape with tapered sides at both sides shown in FIG. 3. In this manner, clean air can be diffused sufficiently to the entire room R from the respective apparatuses 1. 
     The air cleaning apparatuses shown in FIGS. 5 and 7 may be used at the center of the room R as shown in FIGS. 11 and 12. In this case, the duct 7 of the type having the inverted trapozoidal shape with tapered sides at both sides may be employed to effectively clean the air in the room to be cleaned. 
     If outer atmospheric air is introduced into the room to be cleaned as shown in FIG. 9, an outer atmospheric air treating unit 11 may be externally installed via a water supply pipe through the wall to the body 5 of the air cleaning apparatus 1. Furthermore, if an air conditioner is installed in the body of the air cleaning apparatus, a conditioned air pipe 12 may be similarly provided to the outer atmospheric air treating unit. 
     As described above, the air cleaning apparatus is constructed by undergoing the steps of installing the air cleaning apparatus by extending the duct along the body and the surface of the ceiling, and clamping an air cleaning apparatus of a type having a shape and size adapted for the room to be cleaned on the wall surface or on the floor surface. 
     It should be understood from the foregoing description that since the air cleaning apparatus of the present invention is constructed of the air cleaning apparatus in the room to be cleaned according to the present invention, so arranged that the area of the clean air diffuser exits can be sufficiently increased by providing ducts extending on the lower surface of the ceiling at the body and forming the clean air diffuser exits at ducts, thereby completely cleaning the air in the room to be cleaned can be achieved. The clean room can be simply formed by simply clamping the air cleaning apparatus with bolts and nuts in the room to be cleaned or securing the apparatus on the wall surface or on the floor surface, so that it is not necessary to arrange the ducts in the ceiling or in the wall as with conventional apparatus. The clean room can be simply formed regardless of the shape and the size of the room to be cleaned, even in existing buildings. The term of the construction and the expenses of the construction of the clean room with the air cleaning apparatus can be largely reduced, and the inspection and the maintenance of the air cleaning apparatus can be facilitated due to the installation of the air cleaning apparatus in the room to be cleaned.