Patent Publication Number: US-3874191-A

Title: Blower housing

Description:
O United States Patent 1191 11 1 3,874,191 Hudson Apr. 1, 1975 BLOWER HOUSING Primary Examiner-William J. Wye lnvemor&#39; James Hudson Fort wmth Attorney, Agent, or FirmWofford, Felsman, Fails &amp; [73] Assignee: Molded Products Company, Fort Z b I Worth, Tex.  
 [221 Filed: June 12, 1974 ABSTRACT 21) Appl 478,635 The specification discloses a blower housing for dual squirrel cage blowers drlven by an mtermedlately CllS- posed motor for achieving even air distribution for the Ci 62/426 62/4i91 i65/i2i evaporator coil of an air conditioner. The housing has [65/122 HS/219 a front wall with an air egress region for each blower [5 In. Cl. t. a curved bame located in the housing above and Field of Search 62/426; 165M211 122; between the blowers for directing air toward the cen- 415/2i9 tral region of the evaporator coil. In addition, there are provided curved deflectors located in the housing i References Cited above each blower for deflecting air toward the cen- UNITED STATES PATENTS tral region of the evaporator coil. A horizontal slat 1.767.279 6 1930 Bulkeley 62/426 also is Provided in Kile from Wall dividing each air 3110 355 7 935 Larkin egress region into upper and lower air openings for 2.697.921 12/1954 Brugler providing a back pressure to enhance flow of air to- 3.l69.737 2/1965 Wilson ward the central region of the evaporator coil. 3.483.7l3 lZ/l969 3.491.550 1/1970 Cavis 62/426 6 Claims, 9 Drawing Figures FATENTEU APR 1 I975 SHEET 2 OF 3 PATH-BT59 APR 1 975 SHEET 3 BF 3 BLOWER HOUSING BACKGROUND OF THE INVENTION This invention relates to a blower housing for dual squirrel cage blowers driven by an intermediately disposed motor for achieving even air distribution on the evaporator coil of an air conditioner.  
  In blowers which utilize dual squirrel cage blowers driven by an intermediately disposed motor for blowing air on the evaporator coil of an air conditioner. there has been a problem in achieving even air distribution on the evaporator coil. This has been due to the fact that the blower housing air outlets conventionally are disposed only in the areas adjacent to the squirrel cage blowers. Thus. air egresses from the blower housing in two distinct paths with little or no air llow from the housing in the region between the blowers. This results in the central region of the e\ aporator coil. which is between the dual squirrel cage blowers and opposite the motor. getting little or no air distribution.  
 SUMMARY OF THE PRESENT INVIZN&#39;IION It is an object of the present invention to provide a housing for dual squirrel cage blowers for achieving an even air distribution on the evaporator coil of an air conditioner particularly at the central region of the coil.  
  The housing has a front wall with an air egress region for each blower through which air may be blown and which comprises an opening located at a level generally above each blower. A curved baftle is located in the housing above and between the blowers for directing air through the openings toward the central region of the evaporator coil. The curved baflle comprises H curved walls located inwardly of the blowers on each side of a plane extending midway between the blowers and which extend forward toward the front wall and carve toward each other. Also provided are curved deflectors located in the housing above each cylindrical blower for deflecting air toward the central region of the evaporator coil. The deflectors extend forward toward the front wall and carve toward the plane which extends midway between the blowers.  
  In a further aspect, a horizontal slat is provided which separates each air egress region into two openings and enhances the flow of air toward the central region of the evaporator coil.  
 BRIEF DESCRIP&#39;I&#39;ION OF THE DRAWINGS FIG. I is a perspective view of the front of the blower housing of the present invention;  
  FIG. 2 is a perspective view of the rear of the blower housing of FIG. I illustrating the manner in which its front face will be located adjacent the evaporator coil of an air conditioner;  
  FIG. 3 is an exploded view of the housing of FIG. 1 illustrating top and bottom portions which are attached together to form the housing for supporting a motor and dual squirrel cage blowers;  
  FIG. 4 is a view of the top portion of the housing of FIG. 3 as seen from the rear when looking up into the top portion;  
  FIG. 5 is a cross-sectional view of FIG. 4 taken through the lines 5-5 thereof:  
  FIG. 6 is a cross-sectional view through the lines 6-6 thereof:  
 of FIG. 4 taken FIG. 7 is another view of the top portion of the hous&#39; ing as seen when looking up into the top portion generally along the lines 7-7 of FIG. 5:  
  FIG. 8 is a front view ol&#39;one side ofthe housing of the present invention; and  
  FIG. 9 is a cross-sectional view of the front wall of the housing taken through the lilies 9-9 of FIG. 8.  
 DETAILED DESCRIPTION OF THE ll\&#39;\&#39;F.  
  Referring now to FIGS. l3 of the drawings. the housing is identified at II and comprises two spaced apart chambers I3 and IS for housing dual squirrel cage cylindrical blowers I7 and I9 driven by a motor 2I. for blowing air on the evaporator coil of an air conditioner. In FIG. 2. the coil of an air conditioner is illustrated at 23. supported in a housing 25. A front wall 27. having air egress regions. extends across the chambers I3 and I5. In use. the housing II will be positioned to locate the front wall II and its air egress regions next to the coil 23 of the air conditioner as illustrated in FIG. 2. The cylinders I7 and I9 are connected to shafts 29 and 3| extending from opposite sides of the motor 21 and are driven in a clockwise direction as viewed in FIGS. I and 3. for blowing air through the air egress regions formed through the front wall and hence onto the coil 23 of the air conditioner.  
  As illustrated in FIGS. 2 and 3. the front wall 27 extends across the chambers I3 and I5 to positions beyond the outer edges 17A and [9A of the blowers. The top portions of the front wall 27 is identified at 27A while its bottom portion is identified at 278. Each chamber I3 and I5 includes a llat. top wall portion 13A and ISA which extends rearward from the top portion of the front wall 27 and which merges with and joins curved portions 138 and 158 which extend around the blowers I7 and I9 from 278 lower portion 27b of the front wall 27. Curved portions I38 and 158 are spirals in cross section which expand at a rate of 5 relative to the outside diameters of the blowers beginning at tangent lines to the blowers at the top, front portion of the housing. The chambers I3 and I5 have outer side wall portions 33 and 35 spaced outward from the outer edges 17A and 19A of the blowers and inner side wall portions 37 and 39 spaced from each other and inward from the inner edges 17B and 19B of the blowers I7 and I9.  
  The egress regions of the front wall 27 comprise upper openings 4| and 43 and lower openings 45 and 47. The upper openings 4] and 43 are located near the tops of the chambers and at levels above the cylindrical blowers of each chamber while the lower openings 45 and 47 are located in front of the blowers I7 and I9. A curved baffle 51 is located in the housing above and between the cylindrical blowers for directing air from the openings 41 and 43. towards the central region of the evaporator coil. The baffle SI is formed by curved wall portions 53 and 55 coupled to the inner side wall portions 37 and 39 respectively at positions spaced rearward from the front wall 27 and extend forward, curving toward each other. and meet at or near the front wall in the plane extending midway between the inner side wall portions 37 and 39 and hence midway between the blowers I7 and I). The midplane is identified by lines 6-6 in FIG. 4. Referring to FIG. 1. lower plate portions 57 and 59 are connected to the bottoms of the curved wall portions 53 and S7; to the inner side wall portions 37 and 39&#39;. and extend to the front wall 27 to prevent the air. following the curved wall portions 53 and 55 of the baffle 51. from flowing downward and out of the housing behind the baffle. Plate portions 57 and 59 slant downward at an angle of about Ill&#34;,  
  Also provided in the chambers 31 and 15 are curved deflectors 6 I. 63 and 65. 67 which are located immediately above the cylindrical blowers in line with the upper openings 4] and 43 and are curved to deflect and direct air toward the central region of the evaporator coil. As illustrated. the deflectors 61 and 63 are connected to the top wall portion 13A of chamber I3 and extend downward to positions just above the top of blower I7. Similarly. deflectors 65 and 67 are connccted to the top wall portion ISA of the chamber I5 and extend downward to positions just above the top of blower 19. The deflectors 61 and 63 are spaced from each other between the curved wall 53 of baffle 5] and side wall 33 and divide the distance between the curved wall 53 and side wall 33 above blower I7 into approxi mately three equal parts. Similarly. the deflectors 65 and 67 are spaced from each other between the curved wall 55 of baffle 51 and side wall 35 and divide the distance between the curved wall 55 and side wall 35 above blower I9 approximately into three equal parts. h loreovcr, as illustrated, the deflectors 6]. 63 and 65. 67 extend forward from a rear position toward the front wall terminating short of the front edges of top wall portions [3A and A and curve toward the midplane identified by lines 66 in FIG 4. The walls 53 and 55 of the baffle SI and the deflectors 61. 63. 65. and 67 are curved sufficient to direct and deflect air with a minimum of turbulence through the openings M and 43 toward the central region of the evaporator coil and hence provide a better distribution of air on the evaporator coil particularly at its central region thereby increasing the BTU output of the air conditioner.  
  In addition. there is provided a slat 69 which forms a part of the front wall 27 and separates the air egress regions in front of each blower into the upper and lower openings 4]. 45 and 43. 47. The purpose of the slat 69 is to restrict the flow of air out of the air egress regions formed through the front wall to provide a back pressure on the blowers which enhances the function of the deflectors in deflecting air toward the central region of the evaporator coil. In this respect, the back pressure prevents air from flowing down and around the lower edges of the deflectors and hence forces more air to follow the curvature of the deflectors toward the central region of the evaporator coil. Although the slat 69 reduces the cubic feet per minute flowing out of the housing. it enhances the distribution of air at the central region of the evaporator coil and hence results in an increase in BTU or cooling power of the air conditioner. By employing the slat 69. there also is eliminated the problem of water being blown out through the front ofthe air Conditioner. In this respect. in the heretofore conventional housing, high velocity air is blown out of the blower housing and through the evaporator coil in two distinct paths on each side of the center of the coil. This results in a low pressure on each side of the evaporator coil and a higher pressure at the center thereof which in turn results in a circulation pattern of air through the evaporator coil. This air circulation picks up condensed water at the center of the co l which is blown out through the front of the air conditioncrt By the use of the curved baffle and the deflectors. a more even distribution of air flow from the housing to the evaporator coil is obtained as described above. however. it has been found that without the slat 69. some water still is blown out from the front of the air conditioner. This problem has been completely eliminated. however. by use of the slat 69. As seen in FIG. 9, the slat 69 also is inclined downward and acts also to direct air downward, particularly. at higher speeds to provide a better overall air distribution on the evaporator coil portions opposite the blowers.  
  As seen in FIG. 3 the housing II is formed in two parts I IA and I 1B with the bottom ofthe front wall 27 attached to the top of the housing portion H8. The housing part IIA has tabs 7! formed on its top edge and tabs 73 formed on its bottom edge and which are adapted to fit into matching slots 75 formed in the top of the wall 27 and matching slots 77 (see FIG. 2) formed in edge 78 at the other end of the housing part I I8 whereby the two parts IIA and 118 may be held together by the tabs and slots. Connected between the chamber portions of housing parts HA and HE are curved sections which are adapted to fit around the motor 2I when the housing parts IIA and HE are secured together. The curved section connected between the chamber portions of housing part IIA is not illustrated, however, it is connected between the chamber portions of housing part llA by tab members 79 (see FIG. 2). The curved section connected between the chamber portions of housing part HE is illustrated at 81 in FIGS, I and 3. Also provided is a separate halfcylindrical member 87 which is adapted to fit over the curved section connection between the chamber portions of housing part IIA. Member 87 has a front tab (not shown) adapted to hook under member 89 of housing part ISA and two apertures at its back end for receiving bolts 83 and 85. These bolts are adapted to extend through these two apertures and through aligned apertures formed in the edge 78 of housing part I I8 whereby two nuts may be threaded to the bolts on the underside of edge 78 for securely attaching the housing to the motor 2|. As illustrated in FIG. 3, the front wall 27 has a single opening 43 extending along its length which forms the two openings 4| and 43 when the housing parts IIA and 11B are attached together and the slat 69 is located against the front portion of the baffle SI.  
  In one embodiment, the housing sections IIA and H8, the front wall 27 and member 87 are formed of plastic. The housing has a length between outer side edges 33 and 35 of about [2V2 inches. It is constructed to support blowers I7 and I9 having a length of about 3% inches and a maximum outside diameter of about 3 inches. The distance between side walls 33 and 37 and between side walls 35 and 39 is about 4 /8 inches. The opening 42 formed through the front wall 27 has dimensions of about Il /z inches X i of an inch while each of the openings 45 and 47 have dimensions of about 4 inches X /2 of an inch. The slat 69 has a width in its flat plane ofabout one-half of an inch. Deflectors 6] and follow circular curves each having a radius of 5.93 inches while deflectors 63 and 67 follow circular curves each having a radius of 4.10 inches. The curved walls 53 and 55 of the baffle SI follow circular curves each having a radius equal to 2.64 inches. The curves of deflectors 61 and 63 and curved wall 53 have different center points on one side of plane 66 of FIG. 4 while the curves of deflectors 65 and 67 and curved wall 55 have different center points on the other side of plane 6-6.  
  Although the slat 69 has advantages as mentioned above. it may be eliminated between openings 4], 45 and 43, 47 in order to obtain a greater cubic feet per minute output air flow, if desired, although resulting in a lower BTU output. If the slat 69 is eliminated, openings 4i and 45 will merge into a single large opening as will openings 43 and 47. In this embodiment, the baffle SI and deflectors 61. 63, 65, and 67 will be employed to direct and deflect the air towards the central region of the air conditioner coil as described previously.  
 l claim:  
  I. A housing for spaced apart cylindrical blowers located in axial alignment and driven by a motor located between the blowers for blowing air on the evaporator coil of an air conditioner, said blowers being coupled to shaft means of the motor on opposite sides thereof and having outer edges facing in opposite directions and inner edges facing each other, said outer and inner edges being located in planes transverse to the axes of said cylindrical blowers. said housing comprising:  
 a front wall, having top and bottom portions. extending across said housing to positions beyond the outer edges of said blowers,  
 top wall means extending rearward from the top portion of said front wall and which joins surrounding wall means extending around said cylindrical blowers from the lower portion of said front wall,  
 said front wall having an air egress region for each blower through which air may be blown,  
 each air egress region comprising an opening located at a level generally above its cylindrical blower,  
 curved baffle means located in said housing above and between said cylindrical blowers for directing air through said openings toward the central region of the evaporator coil,  
 said curved baffle means comprising curved walls located inward of said cylindrical blowers on each side of a plane extending midway between said blowers and which curved walls extend forward toward said front wall and curve toward each other, and  
 curved deflector means located in said housing above each cylindrical blower for deflecting air through said openings toward the central region of the evaporator coil,  
 said deflector means located above said blowers extending forward and curving toward said plane which extends midway between said blowers.  
 2. The housing of claim 1 comprising:  
 a slat extending across each air egress region separating each air egress region into two openings, one of which includes said opening located at a level generally above its blower and a lower opening located generally in front of its blower.  
  3. A housing for spaced apart cylindrical blowers located in axial alignment and driven by a motor located between the blowers for blowing air on the evaporator coil of an air conditioner, said blowers being coupled to shaft means of the motor on opposite sides thereof and having outer edges facing in opposite directions and inner edges facing each other, said outer and inner edges being located in planes transverse to the axes of said cylindrical blowers, said housing comprising:  
 separate chambers for each blower.  
 a front wall, having top and bottom portions extending across said chambers to positions beyond the outer edges of said blowers,  
 each chamber including top wall structure extending rearward from the top portion of said front wall and which joins surrounding wall structure extending around its cylindrical blower from the lower portion of said front wall,  
 said chambers having outer side wall portions spaced outward from the outer edges of said blowers and inner side wall portions spaced from each other and inward from the inner edges of said blowers,  
 said front wall having air egress region for each blower through which air may be blown,  
 each egress region including an opening near the top portion of said front wall and located at a level generally above the cylindrical blower of each cham her,  
 said openings being defined by top and bottom edges, outer side edges corresponding generally with the positions of said outer side wall portions of said chambers, and curved inner walls,  
 said curved inner walls being coupled to said inner side wall portions of said chambers at positions spaced rearward from said front wall and which extend forward, curve toward each other, and meet at or near said front wall in a plane extending midway between said blowers for directing air toward the central region of the evaporator coil,  
 at least one curved air deflector for each chamber located above its cylindrical blower and connected to and extending downward from said top wall structure in line with said opening of said chamber,  
 said air deflector of each chamber being located be tween said curved inner wall and said outer side wall of its chamber and extends forward from a rear position toward said front wall, curving toward the plane which extends midway between said blowers,  
 said curved inner walls and curved air deflectors being curved sufficient to direct and deflect air with a minimum of turbulence through said openings toward the central region of the evaporator coil.  
 4. The housing of claim 3 comprising:  
 a slat extending across each air egress region separating each air egress region into two openings, one of which includes said opening located at a level generally above its blower and a lower opening located generally in front of its blower.  
 5. The housing of claim 3 wherein:  
 said front wall has a generally flat forward face,  
 said top wall structure of each chamber comprises a generally flat top portion which extends rearward and joins surrounding wall structure extending around its blower from the lower portion of said front wall,  
 each chamber including two curved air deflectors located above its cylindrical blower and connected to and extending downward from its flat top portion in line with said opening of each chamber,  
 said air deflectors of each chamber being spaced from each other between said curved inner wall and said outer side wall of their chamber and extend forward from a rear position toward said front wall, curving toward the plane which extends midway between said blowers,  
 u slut extending across each uir egress region separating CllLh air egress region into two openings. one of which includes said opening lnemed all a level genemlly above its blower and 11 lower opening lueuted generally in from of its hluwer.