US2287806A - Air cleaner and silencer assembly - Google Patents

Description

June 30, 1942. H. a. KAMRATH 7,

AIR CLEANER AND SILBNCER ASSEMBLY I Original Filed Sept. 25, 1935 .3 Sheets-Sheet 1 3mm A H. G. KAMRAT H AIR CLEANER AND SILENCER ASSEMBLY June 30, 194 2.

Original Filed Sept. 25, 1955 5 Sheets-Sheet 2 3 Sheets-Sheet 3 H. G. KAMRATH AIR CLEANER AND SILENCER ASSEMBLY Original Filed Sept. 25, 1935 jib I IHIIII II IH.

June so; 1942.

' Patented June 30, 1942 UNITED STATES. PATENT OFFICE Herbert GnKamrath, Flint, Mich, assignor to General Motors Corporation, Detroit, Mich., a corporation of Delaware Application September 25, 1935, Serial No. 41.999

Renewed July 18, 1940 25 Claims. (Cl. 183-15) parts of a bafie which is incorporated in the air This invention relates to apparatus for removing foreign matter from gases and to assemblies of such apparatus with apparatus for attenuating sound waves in the gases and, more particularly,

to air cleaners and air cleaner and silencer assemblies for use in conjunction with carburetors of internal combustion engines.

In one of its aspects, the invention resides in air cleaners which are particularly adapted for use in localities inwhich there is in the air a large amount of foreign matter which must be removed before the air is fit for introduction into an internal combustion engine. Such air cleaners must, without offering undue resistance to the passage of air, be capable of removing large quantities of foreign matter from it over extended periods of time without any attention or care. An object of this invention in this respect is to provide air cleaners with the mentioned characteristics and capabilities which may quickly and easily be disassembled and reassembled when it becomes necessary to clean them.-

More specifically, in the aspect which has been discussed, the invention .resides in liquid bath type air cleaners and has for an object to provide air cleaners of this type in which there may be maintained a supply of liquid adequate to insure that the filter will be kept wetted and washed and an effective settling pool for foreign matter removed from the air by the air cleaners without danger of liquid being carried beyond the air cleaners by the air or lost by weltering.

In the other of its aspects, the invention resides in assemblies of air cleaners andsilencers and has for its principal object to provide assemblies of liquid bath type air cleaners and resonator type silencers which areeflicient, compact and neat in appearance.

For a betterunders'tanding of the nature and objects of this invention, reference is made to the following specification wherein there are described the embodiments of the invention which are illustrated in the accompanying drawings, in

which:

Fig. 1 is a side elevation of an intake silencer and air cleaner assembly with parts broken away and in section.

Fig. 2 is an enlarged view, partly in elevation and partly in section, of theair cleaner included in the assembly shown in Figure l.

Fig. 3 is a'fragmentary bottom plan view of the air cleaner shown in the preceding. figures with parts broken away.

Fig. 4 is an exploded perspective view of the manner to the air cleaner cover i2.

buretor. an opening in its lower face aroundwhich is secleaner shown in the preceding figures.

Fig. 5. is a' view, partly in elevation and partly in section, of another intake silencer and air cleaner assembly.

Fig. 6 is a fragmentary vertical section through a modified form-of the air cleaner shown in the preceding figures.

Fig. 7 is a perspective view of a baiiie incorporated in the air cleaner shown in Fig. 6.

An assembly of an intake silencer 2 of the resonator type and an air cleaner designated generally'by the reference character A is shown in Fig. 1 of the drawings. At the end opposite that attached to the air cleaner, the silencer is provided with a circular split flange E for attachment to the air intake tube of a downdraft car- The left-hand end of the silencer has cured a split flange 8 into which fits a short hollow cylinder Hi which is secured in any suitable split flange 8 extends a split clamping ring it which is pulled by a screw ll tightly around the der Ill.

'extremity, a cup-shaped outer casing The air cleaner 4 has, at its center; a hollow cylinder l6 to which is secured, near its lower t8, the cylinder projecting through the base of the casing for a short distance. the casing has a series of air louvres 20, throughout its circumference, for the intake of air. Near its lower part the vertical sidewall of the casing is stepped inwardly as indicated at 22 for a pur- -pose which will become evident as the description inner edge to about half way to its ,outer edge,

certain of these openings 30 being extended by slots 32 farther toward the outer edge of the wall 28 to join with arcuate openings 34 near the outer edge of the wall 28'. The upper wall 26 of the filter member has in it a circumferential series of radial openings which are similar to the openings 30 but extend from near the inner to near the outer edge of the wall. These upper Around the r The upper portion of .and lower walls of the filter member are connected by two cylindrical members 36 and 38 which form the inner and outer walls of the filter the upper edge of the side wall .of the casing I8.

Thus the filter member is supported at its outer edge by the casing I8 and at its inner edge by the cylinder IS with its lower wall 28 well above the bottom of the casing IS.

Secured within the central opening in the upper wall 26 of the filter member is a member 48 which is fiaredoutwardlyabove the upper wall the air cleaner from carrying liquid beyond it and also serves toprevent the air passing through the inner portion of the filter member to the exclusion of the rest of it.

The cover portion H of the air cleaner has a peripheral bead 50 formed therein which carries a' sealing gasket 52 which is seated on the outer edge of the flange 486 on the upper wall of the filter member. Thus when the air cleaner is totally assembled with the top in place and the same is applied to the intake silencer'2, as described in the earlier part of the specification, the whole is clamped together by a long rod 54 which extends through the upper wall of -the intake silencer 2 and down throughthe central tube l6 0! the air cleaner as best shown in Fig. 2. The lower end of the cylinder it which, as has been said, projects slightly through the bottom of of the filter member to a point well beyond the I inner edges of the slots in it. The member 48 acts as a baflle to prevent the air passing through the casing I8 is closed by a circular cap 56in which is secured a member 58 through which the 'rod 54 also extends. Between the lower end of the membe'r 58 and the head on the lower end of the rod 51 is clamped'one ,end of'a bracket 60 for. supporting the air cleaner and silencer as- 'sembly. The opposite end of the rod 54, which extends through the upper wall oi'the intake silencer 2, is threaded and a thumb nut 62 is applied thereto to pull the partstightly together. Before the assembly shown in Figure l is put into use, the reservoir defined by the center tube l6 and the casing l8 oi the aircleaner is filled;

with oil or some other suitableliquid 64 to about the level indicated inthe drawing and the filter material 66 .is wetted with the {same 'liquid. When the assembly is in use, air enters it through the louvres 20, passes downwardly through the passage between the outer wall 38 of the filter member and the side wall of the casing 18, around the lower outer edge of. the filter member through the openings 30. The-air then passes through the filter material 66, out of the filter member through the openings in its upper wall 26 whence it passes through the tubular'member l0 into the silencer 2 and thence through 'the opening encircled by the flange 6 into the'carburetor and cylinders of the engine on which the assembly isinstalled. In the course of its travel from the passage between the outer =wall of the filter member and the side wall of the casing into the interior of the filter member, the-air and into the interior of the filter member strikes the surface of the oil in the reservoir,

1 filter material.

'of the air cleaner.

deposits some of the foreign matter carried by it in the oil and picks up some of the oil and carries it with itinto the filter material. The foreign matter which remains in the air and the oil picked up by the air are extracted from the air by. the filter material and, consequently, the air which leaves the filter member is free of foreign matter and oil. The silencer 2, of course, suppresses the intake noise of the engine on which the assembly-is installed and, thus, the assembly shown in Figure 1 cleans the air which enters the engine and eliminates its intake noise.

The oil which is carried into the filter member by the air is continuously returned to the reservoir through the openings 34, carrying with it the foreign matter extracted from the air by the This foreign matter settles to the bottom of the reservoir and is thus removed from the field of action. Thus while the air cleaner is in use the filter material is continuously washed and kept wetted and the foreign matter extracted from the air by the air cleaner disposed at. I

To'the lower outer edge of the filtermember there'is suitably secured a battle 68 which curves downwardly to a point opposite the edge of the step in the side wall of the casing I8 and then inwardly to a point well beyond the openings 34 in the lower wall of the filter member. The baiile 68 has several functions. It reduces the cross sectional area of the passage through which air travels from the passage between the outer wall of the filter member and the side wall of the casing l8 into the interior of the filter member and thus increases the rate of fiow of air and reduces the pressure at this point. The increase in rate of flow of air has the effect of increasing the 'force with which the air impinges against the surface of the oil in the reservoir and, consequently, the amount of dirt depositedby the air in the reservoir and the amount of oil picked up by the air. The reduction in pressure has the effect of increasing the rate-of return of oil from the filter member to the reservoir through the openings 34. The bailie (SB-also serves to shield the openings 34 from the entrance of air and thus to increase their efiiciency as paths for the return of oil from the filter member to. the 1'eser-.

Since it is'desired to use the air cleaner under varyingconditions and with various types and sizes of motors, it is advisable to provide some means for limiting and changing the action of the air and the oil and airin the various parts If the air cleaner is to be used on an exceedingly large motor, the velocity of mean fiow will be very high and too much of the oil in the sump will be carried up into the filtering material. Also, if the air cleaner is to be used on a truck over exceedingly rough ground, it might be possible for some of the oil in the sump to be thrown out through the air intake louvers due to mechanicalvibration.

In order to overcomethese difiiculties and to give a more flexible unit to be used with various installations, a battle has been provided which may be applied to the unit already described or omitted depending on the installations. This baiile consists of a member 12 which is imperiorate and a member ID which is riddled with perforations. The member 12 is ring-like in form and angle-shaped in cross section with spring fingers l8 projecting from the upper edge of its steeply upwardly and outwardly inclined wall. The member 10 is in the form of a' gently inends thereof.

clined frusto-cone and has its outer edge suitably secured to the inner edge I6, of the gently upwardly and inwardly inclined wall of the member 72.

The balile 12-10 is disposed within the casing I8 around the center tube I6 and between the filter member and the bottom of the casing with below the baflie-shields the portion of the oil below it from the air traveling through the air cleaner and also inhibits weltering of the oil in the reservoir. The portion of the oil below the baiile constitutes a pool into which foreign matter extracted from the-air bythe air cleaner may settle out of reach of the air traveling through the air cleaner. The supply of oil above the baille is renewed from the portion of the oil below the baflie by flow over the inner edge of the member I2 and by return ofoil from the filter member through the openings 34 and over the battle 68, beyond which the gently upwardly and inwardly inclined wall of the member I2 projects. Only from the portion of the oil above the baille can the air'traveling through the air cleaner pick up oil and, consequently, the possibility of the air picking up too much oil is eliminated.

the upper end of the intake silencer is shown at 8|] having a central tube 82 concentric within an outer shell 84. The two are connectedtoannular plate 86, the edges being flanged together to form an interconnection between the plate 86 and the outer shell 84 and the center tube 82 being connected with the plate 88 by welding. This plate 86 also supports, above the cylinder 82, an inverted U-shaped bracket 88 which is connected thereto by rivets 88 at the The construction of the air cleaner as a whole inthis instance is substantially the same as that set forth in the previous modification with these exceptions: the lower end of the center tube I6 does not extend through the base of the casing I8; there is no air outlet opening in the cover I2; the lower end of the center tube I6 is open; and the baflle 68' which corresponds to the baiile 68 is riddled with perforations whose efiect is to reduce the velocity of travel of air from the passage between the outer wall of the filter member and the side wall of the casing I8 into the filter member. Further reduction of the velocity of travel of air at this point, which may be desirable'if theair cleaner is to be used on an engine which requires .a very large quantity of air, may, of course, be effected by complete elimination of the bafile.

The air cleaner is seated on the upper end of the silencer with its center tube aligned with the center tube of the silencer through the intermediary of a gasket I88 which serves to pretop of the silencer and the bottom of the air cleaner. The air cleaner is secured to the silencer and the gasket I88 compressed by an elongated thumbscrew 94 which extends through the cover I2 and the center tube I8 and is threaded into ,a member 98 carried by the U-shaped bracket 88.

The modification shown in Figure 5 lends itself to a very compact assembly between the intake silencer and cleaner in that the two are concentric and substantially a single unit with no elbow support as shown in the first form.

The assembly shown in Figure 5 was designed for'installation on an internal combustion engine equipped with a downdraft carburetor with the lower end of the center tube of the silencer connected to the air intake tube of the carburetor. In general this assembly operate in the same manner as that shown in Figures 1 to 4 and it is, consequently, deemed unnecessary to describe its mode of operation further than to point out that in it air leaves the air cleaner through the center tube I6, instead of through the cover, whence it passes into the upper end of the center tube 82 of the silencer and thence through the center tube of the silencer into the,

carburetor and cylinders of the engine on which I84, thelatter being slightly flared over, as

shown at I08, to rest on top of the bead for support. The baflie'then is tapered slightly inward and has a plurality of legs IIU extending downwardly which engage the'lower corner of the filter assembly 24 for support on the lower end. The body of the member I84 is periorated as shown at III, to allow air passage therethrough.

The air cleaner shown in Figures 6 and 7 does not difier from that shown in Figure 5 except in the mentioned respects,- in that the baffie which corresponds to the baflle 68 is imperforate and in that an inverted U-shaped bracket H3 is supported on the inner surface of the cylinder I6 to secure the top on the casing by a bolt I III and a wing nut H8. The bafile Ill l operates very sat isfactorily to prevent any oil splashing from the sump 84 up and out of theannular passage between the filter element and the casing I8. The skeleton construction of-the lower end of this bafile also prevents whatever oil passes through these perforations and any dust entering the louvres from accumulating between the bafilc and the filter element.

I claim:

1. In an air cleaner, an outer casing, a filter 3 assembly supported thereon but spaced from the casing to form an annular air passage, a baliie comprising a ring shaped member, a truncated dished cone secured to the ring member and a plurality of legs projecting from the ring into the space betwen the filter assembly and the casing to support the baiile below the filter assembly.

2. In an air cleaner, a large drum shaped casing having an oil bath in the base, a central tube supported in the casing, a filter assembly supported between the" central tube and the casing and forming with the outer casing an annular air passage through which the air may fiow down to the oilbath, a circular indented bead on the cas- 4 ing adjacent the lower edge of the filter assembly whereby the two form a restricted passage, a circular inwardly curved baflle secured to the filter atthis point to direct the air out over the oil bath and a cone shaped baflie having supporting legs extending into the restricted portion for holding it over the oil bath to prevent excessive quantities. from being carried up into the filter.

A 3. An air cleaner comprising, a large drum shaped casing having an oil pool in its base, a

central cylindrical tube supported in the center of the casing, an annular filter assembly supported between the two and spaced from the outer casing to form a vertical air passage, and a perforated annular ring baflle supported in the air'passage between the-side wall of the'filter assembly and the side wall of the casing to pre; vent the oil from splashing out of the base of the casing.

4. In an air cleaner, a large drum shaped casing, a central tube which is connected to and extends upwardly from the bottom of the casing,.

an annular filter assembly including an annular top plate extending on both its inner and outer edges beyond the body of the assembly, flanges on both the inner and outer edges of the mentioned top plate adapted to engage the; upper rim of the tube and the casing, respectively, to support the filter assembly, and a' gasket between the top of the tube and the inner flange on the top plate.

5. In an air cleaner, 9. large drum shaped casing having an oil pool in its base, a central cylindrical tube supported in the center of the casing,

an annular filter assembly supported between the two and spaced from the outer casing to form a vertical air passage, and a perforated annular battle in the shape of a truncated cone supported in the air passage between the side wall of the filter assembly and the side wall' of the casing and extending from the casing to the filterv assembly,

' 6 In an air cleaner, 9. generally cup-shaped body, a generally'tubular element which is conside wall of the former and provided with spring fingers which engage the latter. 4

9. In. an air cleaner, a generally cup-shaped body, a generally tubular element which is connected to and extends upwardly from the bottom of the generally cup-shaped body and defines therewith an annular receptacle, an annular filter element disposed within the annular receptacle and spaced from the side and: bottom walls of i the generally cup-shaped .body; and a generally -frusto-conical bafile riddled with openings which extends between the side wall of the generally cup-shaped body and the side wall of the annular filter element and is provided with spring fingers which maintain it in position.

10. In an air cleaner, a generally cup-shaped body, a generally tubular element which is connected to and extends upwardly from the bottom of the generally cupshaped body' and defines therewith an annular receptacle which constitutes a liquid -reservoir,'a hollow annular member disposed within the annularreceptacle and spaced from the side and bottom walls of the generally cup-shaped body, openings in the lower wall of the hollow annular member near its inner and outer edges connected by radially extending openings with smaller dimensions circumferentially of the hollow annular member,

.and dust-collecting material within the hollow annular member.

11.-In an air cleaner and silencer assembly, a silencer which consists of a generally vertically disposed shell, a wall which closes the upper end nected to and extends upwardly from the bottom of the generally cup-shaped body and defines therewith an annular receptacle which constitutes a liquid reservoir, an annular filter element disposed within the annular receptacle and spaced from the side and bottom walls of the generally cup-shaped body, and an annular bafiie riddled with relatively small perforations which is carried by and dependsfrom the outer wall of the annular filter element and terminates short of the bottom of the generally cup-shaped body.-

of the shell, and a generally tubular element which extends through the specified wall and the interior of the shell; an air cleaner which consists of a generally vertically disposed generally 7. In an air cleaner,- a generally cup-shaped 7 body, aigenerally tubular 'element which is connected to and extends upwardly from the bottom of the generally cup-shaped body and'defines therewith an annular receptacle which constitutes a liquid reservoir, an annular filter element disposed within the annular receptacle and spaced from the'side and bottom walls of the generally cup-shaped body, and an annularbaflle which is supported by the generally cupcup-shaped body mounted on the upper end of the silencer element, a cover therefor, and a generally tubular element which is connected to the bottom of the generally cup-shaped body and is approximately alined with the first-specified generally tubular element; a sealing gasket which is interposed between the bottom of the generally cupeshaped body of the air cleaner and the upper end wall of the silencer and encircles the duct defined-by the specified generally tubular elements, and an element which extends through the cover and the generally tubular element of the air cleaner and is connected to the silencer to comshaped body between its bottom and the bottom of the annular filter element and extends from the side wall of the generally cup-shaped body toward the generally tubular element with its outer and inner edges above and an interme diate portion of it below the liquid level in the cup-shaped body.

press the gasket and secure the air cleaner and the silencer together.

12. In an air cleaner, a generally cup-shaped body, a generally tubular element which is connected to and extends upwardly from the bottom of the generally cup-shaped body and defines with it an annular receptacle which constitutes a liquid reservoir, an annular filter element disposed within the annular receptacle and spaced I from the side and bottom walls of the generally cup-shaped body, and an annular bafile which is supported by the generally cup-shaped body be tween itsbottom and the bottom of the annular filter element and extends downwardly and then upwardly from the side wall of the generally cupshaped bodytoward the generally tubular element and is imperforate near its outer edge and riddled with relatively small openings inwardly thereof.

" ried by and depends from the outer wall of the annular filter element and is inclined in the direction of the generally tubularelement and terminates short of the bottom of the generally cupshaped body, and an annular baflie which is supported by the generally cup-shaped body between its bottom and the bottom of the annular filter element and extends from the side wall of the generally cup-shaped body toward the generally tubular element with its outer edge above and a portion of it below the liquid level in the generally cup-shaped body.

14. In an air cleaner, a generally cup-shaped body, 'a generally tubular element which is connected to and extends upwardly from the bottom of the generally cup-shaped body and defines with it an annular receptacle which constitutes a'liquid reservoir, an annular filter element disposed within the annular receptacle and spaced from the side and bottom walls of the generally cup shaped body, a generally frusto-conical baflie riddled with openings which extends between the side wall of the generally cup-shaped body and the side wall'of the annular filter element, and an annular baflle which is carried by and depends travel upwardly from the surface of the liquid in the reservoir toward the air outlet orifice,

means in the last mentioned passage to remove from the air which travels through it foreign matter and liquid picked up by the air from the supply in the reservoir, the generally bowl-shaped member having in it, in the path of travel of air toward the surface of the liquid in the reservoir,

' a circular shelf which is disposed below the static level of liquid in the reservoir but above the bottom of the generally bowl-shaped member, and a baffle which is riddled with perforations extending upwardly and in the direction of travel of air through the air cleaner from the edge of the shelf.

1'7. In an air cleaner, air inlet and outlet orifices, a generally bowl-shaped'member which constitutes a liquid reservoir, a generally cylindrical member disposed within the generally bowlshaped member and spaced from the side and lower walls thereof to define a passage through which air may travel downwardly from the air 'inlet orifice toward the surface of the liquid in the reservoir and a passage through which air may travel upwardly from the surface of the liquid in the reservoir toward the air outlet orifice, means in the last mentioned passage to remove from the air which travels through it foreign matter and liquid picked up by the air from the supply in the reservoir, and a circular baffle which extends upwardly in the direction of travel of air through the air cleaner from a point below to a point above the static level of'liquid in the reservoir and has an imperforate portion below and a portion riddled with perforations above the static level of liquid in the reservoir.

18. In an air cleaner, air inlet and outlet orifices, a generally bowl-shaped member which from the outer wall of the annular filter element and is inclined in the direction of the generally tubular element and terminates short of the bottom of the generally cup-shaped body.

15. In an air cleaner, a generally bowl-shaped member, a generally tubular member which is connected to and extends upwardly from the lower wall of the generally bowl-shaped member and with it defines an annular receptacle which constitutes a liquid reservoir, an annular filter member with air inlet and outlet orifices in its lower and upper walls disposed within the generally bowl-shaped member with its outer side and lower walls spaced from the side and lower walls of the generally bowl-shaped member to define a passage through which air may travel from the atmosphere toward the surface of the liquid in the reservoir and thence into the air inlet orifice in the filter member, the generally bowl-shaped member having in it in the path of travel of air toward the surface of the liquid in the reservoir, an annular shelf which is disposed below the static level of liquid in the reservoir but above the bottom of the generally bowl-shaped member, and a baffle which is riddled with perforations extending inwardly and upwardly from the inner edge of the shelf toward the center of the air cleaner.

16. In an air cleaner, air inlet and outlet orifices, a'generally bowl-shaped member which constitutes a liquid reservoir, a generally cylindrical member disposed within the generally bowlshaped member and spaced from the side and lower walls thereof to define a passage through which air may travel downwardly from the air inletorifice toward the surface of the liquid in the reservoir and'a passage through which air may constitutes a liquid reservoir, a generally cylindrical member disposed within the generally bowl-shaped member and spaced from the side and lower walls thereof to define a passage through which air may travel downwardly from the air inlet orifice toward the surface of the liquid in the reservoir and 'a passage through which air may travel upwardly from the surface of the liquid in the reservoir toward the air outlet orifice, means in the last mentioned passage to remove from the air which travels through it foreign matter and liquid picked up by the air from the supply in the reservoir, the generally cylindrical member having a portion through which air may pass from the first mentioned into the last mentioned passage projecting below the last mentioned means.

19. In an air cleaner, a generally bowl-shaped member which constitutes a liquid reservoir, a

' filter member with air inlet and outlet orifices in it disposed within the generally bowl-shaped member with its outer side and lower walls spaced from the side and lower walls of the generally bowl-shaped member to define a passage [through which air may travel from the atmosphere toward the surface of the liquid in the reservoir and thence into the air inlet orifice in the .filter member, and means through which air may pass disposed in the mentioned passage between the side wall of the filter member and the side wall of the generally bowl-shaped memher to prevent liquid splashing out of 'the.,,reservoir therethrough.

20. In an air cleaner and silencer assembly, a generally vertically disposed-shell which constitutes an element of a silencer, a generally bowlshaped member which constitutes an element of an air cleaner and a cover for the upper end of the generally vertically disposed shell mounted on the generally vertically disposed shell at its periphery and secured to it, a duct through which air is conducted from the air cleaner into the generally vertically disposed shell and through the generally vertically disposed shell includinga generally tubular member which is connected to and extends upwardly from the lower wall of the generally bowl-shaped member. and with it defines an annular receptacle which constitutes a liquid reservoir, an annular filter member with air inlet and outlet orifices init disposed within the generally bowl-shaped member with its outer liquid in the reservoir but above the bottom of the generallybowl-shaped member.

- 23'. In an air cleaner, air inlet and outlet orifices, a generally bowl-shaped member which constitutes a liquid reservoir, a generally cylindrical member disposed within the. generally bowl-shaped member and-spaced fromthe side and lower walls thereof to define a passage side and lower walls spaced from the side and lower walls of the generally bowl-shaped member to define apassage through which air may connected to and extends upwardly from thelower wall of the generally'bowl-shapedmember and with it defines an annular receptacle which constitutes a liquid reservoir, and an annular filter member with air inlet and outlet orifices in its lower and upper walls disposed within the generally bowl-shaped member with its outer side and lower walls spaced from the side and lower walls of the generally bowl-shaped member to define a passage through which air maytravel from the atmosphere toward the surface of the liquid in the reservoir and thence into the air inlet orifice in the filter member, the generally bowl-shaped .member having in it in the path of travel of air toward the surface of the liquid in the reservoir an imperforate annular shelf which is disposed below the static level of liquid in the reservoir but above the bottom of the generally bowl-shaped member,

22. In an air cleaner, air inlet and outlet orifices, a generally bowl-shaped member which constitutes. a liquid reservoir, a generally cylindrical member disposed within the generally bowl-shaped member and'spaced from the side and lower walls thereof to define a passage through which air may travel downwardly from the -air inlet orifice toward the surface of the liquid inthe reservoir and a passage through which air may. travel upwardly from the surface of the liquid in the reservoir toward the air. outlet orifice, and means in the last mentioned passage to remove from the air which travels through it foreign matter and liquid picked up by the air-from the supply inthe reservoir, the generally bowl-shaped member having mm in the path of travel of air toward the surface of the liquid in the reservoir an imperforate circular shelf which is disposed below the static level of through which air may travel downwardly from Y the air inlet orifice toward the surface of the liquid in the reservoir and a passage through which air may travel upwardly from the surface of the liquid in the reservoir toward the air outlet orifice, means in the last mentioned passage to remove from the air which travels through it foreign matter and liquid picked up by the air from the supply in the reservoir, the generally bowl-shaped member having in it in the path of travel of air toward the surface of the liquid in the reservoir an imperforate circular shelf which is disposed below the static level of liquid in the reservoir but above the bottom of the generally bowl-shaped member, and a baflie extending upwardly and in the direction of travel of air through the air cleaner from the edge of the shelf,

24. Inan air cleaner, air inlet and outlet orifices, a generally bowl-shaped member which constitutes a liquid reservoir, a generally cylindrical member disposed within the generally bowl-shaped member and spaced from the side and lower walls thereof to define a passage through which air may travel downwardly from the air inlet orifice toward the surface of the liquid in the reservoir and a passage through which air may travel upwardly from the surface of the liquid in the reservoir toward the air outlet orifice, means in the last mentioned passage to remove from the air which travels through it sembly from the head so that it defines thereforeign matter and liquid picked up by the air from the supply in the reservoir, and a circular bafljle which extends upwardly in the direction of travel of air through the air-cleaner from a point below to a point above the static level of.' liquid in the reservoir and has animperforateportion below the static level of liquidin the reservoir.

a head secured over one end of the shell, a duct which includes a tubular member through which air is conducted into the shell and which is secured in and opens through the head, anannular member disposed over the head with the orifice in it aligned with the tubular member and its inner edge spaced lengthwise of the aswith a continuation of the duct and recess which opens into it throughout its circumference, anda filter member through which air passes into the duct through the orifice in the annular member mounted on the annular member.

' HERBERT G; KAMRATH.

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