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Publication numberUS2091774 A
Publication typeGrant
Publication dateAug 31, 1937
Filing dateSep 16, 1935
Priority dateSep 16, 1935
Publication numberUS 2091774 A, US 2091774A, US-A-2091774, US2091774 A, US2091774A
InventorsWeiland Alfred
Original AssigneeBaldwin Southwark Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Muffler-filter apparatus for air flow passages
US 2091774 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

A. WEILAND Aug. 31, 1937.

MUFFLER FILTER APPARATUS FOR AIR FLOW PASSAGES 2 Sheets-Sheet l Filed Sept. 16, 1935 INVENTOR A. 'IVe/Yana MUFFLER FILTER APPARATUS FOR AIR FLOW PASSAGES Filed sept. 1e, 1935 2 sheets-sheet 2 i Illl INVENTOR PatentedI Aug. 31, 1937 UNITED STATES PATENT OFFICE Alfred Weiland, Philadelphia, Pa., Baldwin-Southwark Corporation,

tion of Delaware4 assigner to a corpora- Application September 16, 1935, Serial \No. 40,800

8 Claims. This invention relates generally to a combined noise silencing and filter apparatus for air flow passages particularly in a self-contained air conditioning unit. In air conditioning apparatus, especially of the self-contained room unit type having a compressor, condenser, evaporator and 4blower for circulating room air over the evaporator, there is likely to be some noise caused by the blower or compressor mechanism or by the ow of air through the passages and over the fins of the evaporator. It is particularly desirable to maintain all noise at a minimum inasmuch as such a self-contained unit is placed directly within the room occupied by a person.

It is one object of myv invention to provide for he room air inlet and discharge of an air conditioning unit an improved muiller and filter system and apparatus that is `economical in manufacture and maintenance, is eillcient both in filtering and in silencing noise while at the same time oiering minimum resistance to the air ow, is compact and pleasing in appearance' and can be readily removed for cleaning or inspection. A further object is to provide an improved ltermuliler adapted to effectively direct and distribute air into the room and into the inlet of the blower.

Other objects and advantages will be more apparent to those skilled in the art from the following description of the accompanying drawings in which:

Fig. 1 is a perspective of a self-contained air conditioning unit embodying my improved muffler system, parts thereof being broken away to show details of construction; Fig. 2 is a plan view of the discharge muiiler With the infiowing baiiles omitted for sake of clarity;

Fig. 3 is a transverse section on the line 3-3 of Fig. 2;

line 4 4 of Fig. 1;

Figs. 5, 6, 'l and 8 are rear intake lter-muillers.

In the particular embodiments of the invention which are shown herein merely for the purpose of illustrating certain specific forms among possible others that the invention might take, I have shown in Fig. 1 an air conditioning unit generally 50 indicated at I of any suitable type, although specifically of the form shown in application of H. L. Galson, Serial No. 648,772, tiled December 24, 1932. The specic construction of such a unit does not constitute a part of my present 55 invention. Hence it will sumce to state that the Views of modified Fig. 4 is a vertical fragmentary section on the unit contains a compressor, an air cooled condenser, an evaporator, and blowers, one for circulating room air over the evaporator and another for circulating outside air over the condenser, although it will be apparent that my improved muming and filtering system is applicable to remote coolingunits having only a cooling element without the compressor or condenser, as well as being applicable to the inlet and discharge openings for various types of passages. However, the invention is particularly applicable to the unit herein disclosed as it has in one end a room air inlet 2 communicating with a blower 3 and an evaporator passage which terminates in a horizontal outlet 4. 'I'his outlet lies in the top surface of the mechanical structure of the unit and is specifically of elongated form, Fig. 2, located forwardly of the unit but does not extend for its full length. A cabinet 5 entirely encloses the mechanical construction of the unit and is provided with a large rectangular opening 6 in 20 one end to receive the inlet muiiier generally indicated at 1.

The inlet mufller comprises a relatively large rectangular frame having an end panel 8 and side pieces 9 extending entirely around the panel 25 edges, this relatively shallow box-like construction being open on its inner side. Disposed near the top of the panel is a series of preferably vertically elongated openings I0 between which, on 30 the inside of the box, are a series of vertically extending short bailles I I and a pair of substantially centrally located long baliles I2 all equally spaced in parallel relation and at right angle to the panel. 'I'he foregoing bailies are covered with any suitable sound absorbing material such as shown in application of mine, Serial No. 36,502, filed August 16, 1935, such material also functioning as an impact filter. All of the baliles extend from the inner face of front panel 8 to the plane of the outer edge of side Apieces 9.

On the discharge side of the unit, the cabinet is, provided, Fig. 1, with a top portion I4 and a raised outlet portion I5 at theV rear of the cabinet, extending for the full length of the unit in vertically spaced relation to vthe top of passage I. Disposed within and extending for the full length of the raised outlet I5 is 'an upper series of longitudinally extending and slightly forwardly inclined baflles I6 while a lower series of rearwardly inclined longitudinal bailles I'I are placed with their upper edges substantially adjacent the lower edges of the upper baiiies I6, l thereby forming substantially parallel V-shaped air flow passages. 'I'he lower edge of the series 55 of bailles |I is substantially in the plane of top I4 whereby air discharged from evaporator passage 4 first flows, as indicated by arrow line |8, Fig. 1, into the common chamber I9 and thence rearwardly therein to bailles I6 and |I which direct the air forwardly into the room. To insure uniform distribution of air in chamber I4 and outlet I5, there is provided a vertically extending but angularly disposed baille 20 within chamber I9. This baille overlies evaporator outlet 4 about midway of its length and extends vertically from beneath top I4 down to the inner top surface 2| of the unit in which outlet 4 terminates, thereby compelling air from the two divided portions of outlet 4 to be equally distributed throughout the length of the elongated outlet I5.

In the operation of the apparatus, room air flows inwardly through the series of openings I and thence downwardly through the parallel passages formed between the series of vertical bailles and I2. The air upon leaving the end of baiiles turns laterally inwardly to fan inlet 2 while the air flowing downwardly between bafiles I2 turns directly into the inlet. 'Ihe bailles areA shorter than baffles I2 due to the necessity of the air turning laterally from bailles into the blower inlet 2, but bailles I2 insure symmetrical flow of air into inlet 2. The air thence flows upwardly through the evaporator passage 4 and is turned rearwardly as indicated by line I8, Fig. 1,- and is longitudinally distributed by angular,baiile 2|), Fig. 2, and then flows upwardly first through the lower rearwardly inclined baffles I'I and then forwardly through upper bailles I6, Fig. 1. Due to all of the foregoing inlet and discharge baliies being covered with silencing material preferably of the type disclosed in said previously mentioned application of mine, it is seen that the air travels over a very large area of muffler surface with a uniform and continuous flow through such baille passages. It has been found that such an arrangement emclently muiiies any ynoise and filters the air while at the same time permitting eiiicient air flow through the unit.

It will, of course, be understood that various modified arrangements of the bailles may be employed while retaining the broad principles as herein disclosed, and certain of these arrangements are shown in Figs. to 8. In Fig. 5, a series of staggered bailles 25 are provided within the box I. Instead of having a series of openings |U as shown in Figs. 1 and 4, a single elongated opening 26 is provided and also the lower ends of bailles 25 preferably terminate short of the blower inlet whose position is diagrammatically indicated by a dotted circle 26. In Fig. 6, a series of zig-zag bailles 2l are provided between the inlet 28 and blower while a pair of angular bailles 29 are provided in the lowermost corners of the box l. In Fig. '1, a longer air flow passage is provided in box I by having the room air inlet in the loweredge as indicated at 30 from which the air flows upwardly along the outside of angular bailies 3| disposed substantially tangent to the periphery of inlet 2 and thence around the upper ends of said bailes 3| and down through a series of vertical bailles 3l. illsV which is not only pleasing in appearance but is relatively simple and economical in manufacture, maintenance and operation and which has the further function of operating as an impact lter whereby the long travel of air over the muiller surfaces will permit dirt to adhere to such surfaces and thuslter the air.

It will of course be understood that various changes in details` of construction and arrangement of parts maybe made by those skilled in the art without departing from the spirit of the invention as set forth in the appended claims.

I claim:

1. A muliling system for an outlet of an air flow passageway comprising, in combination, means forming a chamber into which the air initially flows from said outlet, and means forming outlet baille passages of substantially V-shaped formation communicating with said chamber to discharge the air in a predetermined direction.

2. A muilling system for the inlet and outlet of an air flow passage comprising, an elongated baille chamber one end of which communicates with the inlet of said passage and the other end of which has air admission openings, a series of substantially straight baffles forming elongated passages extending from said admission openings to said passage inlet, means forming a chamber over the outlet of said passage, and means forming a, series of baille passages communicating with said chamber so as to freely discharge air therefrom in a predetermined direction.

3. A muilling system for an air flow passage having an outlet, means forming a chamber disposed over and also extending laterally of said outlet including an upper wall immediately over said outlet in spaced relation thereto, and a plurality of silencing baille passages located above and communicating with said laterally extending portion of said chamber, whereby the air flows upwardly through said outlet into said chamber at a point beneath said upper wall and then laterally and thence upwardly through said baille passages to be discharged therefrom in a given direction as determined by said bailles.

4. The combination set forth in claim 3 further characterized in that said chamber extends ber in only one of said laterally disposed portions. thereof.

5. A muilling system' for an air flow passage in an air conditioning unit having an Aoutlet in the top thereof but of shorter length and width than that of the unit, means forming a horizontal chamber extending for the full length and width of the unit and having a portion overlying said outlet, and means forming a plurality of silencing baille passages along one longitudinal side of said chamber and adapted to discharge the air forwardly toward the other longitudinal side of the unit.

6. The combination set forth in claim 5'further characterized by the provision of an angular baille overlying the outlet of said passage for distributing the air to longitudinally spaced portions of said baille passages.

7. A muilling system for the inlet passage of an air flow passage comprising means forming an elongated chamber one end of which overlies and is wider than said inlet and the other end of which is provided with air admission openings, a plurality of silencing bailles disposed within said/chamber and extending in the direction of elongation thereof, certain of said baifles being of suicient length to extend directly over4 said inlet and other of said bailles being of shorter enclosing said unit and having an opening therelength adjacent said inlet, whereby the elongated in adjacent the inlet of said air ilow passage,

baffles cause air to ow directly to said inlet while means forming a chamber removably disposed in the shorter bailles permit air to turn laterally said opening, means forming a series of silenc- 5 from their shortened ends into said inlet. ing baille passages within said chamber, and 8. A muiling system for the inlet of an air means providing an air admission opening in said ow passage extending through an air conditlonchamber forming means. ing unit comprising, in'combination, a' cabinet ALFRED WEILAND.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6481527 *Mar 14, 2001Nov 19, 2002Emc CorporationMethods and apparatus for attenuating noise from a cabinet that houses computer equipment
US7783055 *Nov 30, 2006Aug 24, 2010Silentium Ltd.Soundproof climate controlled rack
US7869607Nov 30, 2006Jan 11, 2011Silentium Ltd.Quiet active fan for servers chassis
US8855329Jan 20, 2008Oct 7, 2014Silentium Ltd.Quiet fan incorporating active noise control (ANC)
US20070110255 *Nov 30, 2006May 17, 2007Yossi BarathSoundproof climate controlled rack
U.S. Classification181/200, 181/211
International ClassificationF24F6/04
Cooperative ClassificationF24F6/04
European ClassificationF24F6/04