US2050581A

US2050581A - Air cleaning and sound-silencing apparatus

Info

Publication number: US2050581A
Application number: US636402A
Authority: US
Inventors: Orem Frederick Strattner
Original assignee: Individual
Current assignee: Individual
Priority date: 1932-10-05
Filing date: 1932-10-05
Publication date: 1936-08-11
Anticipated expiration: 1953-08-11

Description

Aug. 11, 1936. F, s, QREM 2,050,581

` AIR CLEANING AND SOUND SILENGING APPARATUS Filed Oct. 5, 1932 ,2 Sheets-Sheet 1 '26' l vl 12 24 v I@ gn/wmf 13 Eli'l'zpnerm,

MQMMMM yf @Moz/W4 Aug.11l936 F. s. oREM 2,050,581

AIR CLEANING AND SOUND SILENCING APPARATUS Filed oet. 5, 1932 2 Sheets-Sheet 2 Patented Aug. 1'1, 1936 AIR CLEANING AND SOUND-SILENCING APPARA TUS ' 'Frederick simmer om. Baltimore, 1Mo. application october 5, 1932, smal No. $36,402

3Claims.

This invention relates to apparatus for illtering air and for silencing sound, which apparatus is particularly suitable for-attachment'to the air intake oi a carburetor of an internal combustion 5 engine.

An object of the present invention is to provide a device adapted to'be connected to the air intake of a carburetor of an internal combustion engine, which functions both as a iilter to lter the air before it is drawn into the carburetor by the suction of the engine, and as a means for silencing carburetor noises and noises from the engine, which latter noises pass backward through the manifold of the engine to the air intake of the carburetor.

Another object of the present invention is to provide a device that will not become clogged and will not require cleaning.

A further object is to provide a device which,

2o when employed for silencing carburetor and other noises passing through the carburetor, will in no way interfereV with the freel flow of air through the carburetor to the engine.

A still further object is to provide a combined air-filtering and sound-silencing device that is compact, simple in-construction, and inexpensive tomanufacture. p l

To these objects and such other as may hereinafter appear, the invention comprises features of construction and arrangement oi' parts`hereinaiter described and particularly pointed o ut in the appended claims. ,l

In the drawings Figure 1 is' a vertical cross sectional view of the apparatus showing the relative positions of the air-iiltering means and of the sound-silencing means;

Figure v2 is a cross sectional view on line 2-2 A of Figure 1 in the direction of the arrows; and

Figure 3 is a cross sectional view on line 3-3 of Figure 1 in the direction of the arrows.

' The apparatus of thepresent invention comprises an air-filtering chamber having an outer side wall I, and an upper wall 2 providedwith an opening 3 communicating with a sound-silencing chamber 4. y

'Ihe outer wall is preferably. cylindrical in shape. Within the air-filtering chamber, formed by said wall, are a plurality of vertically disposedv 0 cylindrical 4ltering Ameans, which cylindrical means arenested within each other and spaced apart. In the drawings three such cylindrical nltering means, namely, 5, 6, and 1, are shown. Each of these means comprises a wire mesh screen 8 and'illtering material, such as a felt layer 3, snugly iltting against the screen. The filtering material on the outer cylinder 5 covers the entire screen portion of the cylinder, with the exception of one or more rows of meshes at Ythe upper end of the cylinder. This leaves an annular opening at this point, the area of which is substantially the same as the area. of the opening leading from the appliance into the carburetor. 1

'I'he entire wire screen material of cylinders 6 and -1 is covere`d with ltering material.

'I'he upper ends of the cylinders 5, 8, and 'I are held in place on the wall 2 in any suitable manner. The lower end of the cylinder 5 rests on the upper end of the wall of a cup shaped element I0. 'I'he lower end of the cylinder 6 comprises a solid baille wall I I which extends downwardly part way into the cup shaped element I0. Within the cup shaped element' I0 is a tubular member I2 which extends partly into the air-filtering chamber, and 15 is in alignment and communication with an air outlet I3 extending from an opening in the bottom oi the cup shaped element I0. The lower end of the solid baille wall II is spaced from the tubular member I2, and from the wall of the 20 Acup shaped element I 0. The area of the annular opening at X between the bottom edge of -the baille II and the wall I2 is preferably substantially equal to the areaof the opening left inthe uncovered portion of the screen 5. The annular chambers I4, I5, and I 6, formed by the iiltering meansconstructed as described, provide, therel fore, for the free passage of air through the said annular chambers as well as through the screen adjacent the upper end of cylinder 5 when pass- 30 ing from the annular chamber I4 into the annular chamber I5 and also into the lower end of the cylinder 6 when passing from the annula chamber I 5 into the annular chamber I6.

The inner cylinder 'I forms an unobstructed central passage I1 which communicates at its lowerl end with the tubular member I2 and at its upper end with the opening 3, which leads into' the sound-silencing chamber 4. The opening 3 comprises preferably a short, tubular structure, the upper end of the wall of which ares outwardly into the chamber '4, as at- I8. u

The sound-silencing 'chamber 4 may be any desired shape, and the walls thereof are lined with thick layers of sound-silencing material I9, such 45 as felt. Separate felt layers may be placed on the upper, lower and-side walls of chamber 4 as' shown. The felt layer on the side wall may be provided with metal edges I 9a and I9b which extend around the wall in the form of rings and serve to hold the `felt firmly in place.y

Sound wavestravel axially from the vintake of the carburetor and enterthe coaxially disposed silencing chamber 4 which has` its inlet 3 axially' in line with the opening receiving the soundA waves and which has a closed annular space surrounding the said axial opening.

A tie rod 2|, :which serves to hold various parts -of the device in position when assembled, extends through the top 20, a sleeve.22,'a spider 23 down- (i0 tached to the air intake of a carburetor (not shown). When the engine is operated, air is sucked in through the openings 28 provided at the lower end of the annular chamber i4.

The porosity and area of the walls of the filtering elements are such that sufficient air will pass through the said walls and the filtering action will take place. The outer cylinder 5 intercepts most of the dust. The pulsations in the air currents passing through the filtering material assist in dislodging dust that collects on the surface of the material. Dust dislodged from cylinder 5 falls through the openings 28.

Any clust in the air passing through space 29 will be separated from the air and fall into the cup shaped element lll from which it may be removed by opening the shutter 26. The member il serves as a bame to retard any dust that may be carried to this point by the air fiow so that this dust will deposit at the bottom of the appliance for removal through the end discharge opening 25.

Spaces 29 and X supply any additional air that may be required bythe carburetor. There is no interference with thejfree' ow of air from inlet to outlet of the devic';

In the annular "chamber l5, the air-takes a generally downwardly direction, some of it passing through the filtering material on cylinder 6, and the rest of it passing around the lower edge of the wall Il upwardly into the annular chamber I6. The air then passes through the filtering material on cylinder 1.

The air taking the various paths indicated by the arrows, receives its nal cleaning by passing through the felt layer of the cylinder 'l whereupon the air is drawn through the central passage Il into the air intake of a carburetor of an engine. Any dust not removed by

cylinders

5 and 6 respectively, which function both as filters and bafies, is removed by innermost cylinder l, and falls into cup shaped element l0.

'The so-called carburetor noises are due generally to the rush of air through the air intake and to sound waves generated in the manifold system of the engine. By means of my device, these noises are silenced. The silencing is effected to some extent both by the various filters and by reversing the direction of the air currents, as shown. However, the greater portion of the sound in the passage ll leaving the intake of the carburetor travels in a direction parallel to tl'ie'v l. Apparatus comprising a chamber having end Y walls and side wall, an opening in an end wall adapted to be connected to the air intake of a carburetor, a plurality of air-,filtering walls in the said chamber concentrically arranged around a passage formed by the innermost of the said airflltering walls and leading from the said chamber to said air intake, an intermediate air-filtering wall of said concentrically arranged walls having a free end, a solid terminal baiile extension attached to the said end of the said intermediate wall around the free edge of which baille extension air can freely pass, the outermost of said filtering Walls having a second solid terminal extension beyond the end thereof forming a cup-like member into which said first named extension projects, and the air ltering wall forming the said passage being completely closed with filter material through which all required air normallly passes without interfering with the free passage of air to the said air intake, and a second chamber closed to the atmosphere and connected to the said passage and provided with a lining of sound-silencing material.

\2. Apparatus comprising walls forming a chamber provided with a lining of sound-silencing material covering the entire wall space, the said chamber otherwise closed to the atmosphere, having an opening, a closed tubular filter communicating at one end `with said opening and at the other end with the air intake pipe of a carburetor, the said closed filter being completely covered with filter material of such dimensions and porosity that all required airA for the carburetor freely passes therethrough unimpeded, and a plurality of additional tubular filters outside of and coaxial with said inner closed iilter and providing an open annular circuitous air pas- 1 sageway leading to the outside of said inner closed filter to enable free flow of required air through or around said-.additional filters, the said inner and outer lters together with the open circuitous passageway being capacitated to remove dust from the unimpeded required air supply to the carburetor, and to deaden any sound from the carburetor not completely deadened by said lined chamber.

3. The combination in a combined air filter and sound silencer, of dust extracting means comprising an inner closed tubular filter communicating with an opening to the carburetor, anda plurality of tubular filters outside of and coaxial with said inner closed filter and providing an open annular circuitous air passageway leading to the outside of said inner filter, said annular circuitous air passageway passing around the alternate opposite ends of said outer filters and beine substantially as large in total area at its smallest point as the area of the inlet opening to the carburetor, said inner closed filter being constructed ramsarcrr sans 1;