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Патент USA US2510440

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June 6, 1950
c. G. VOKES
2,510,440 7
FILTER AND SILENCER mm
Filed Oct. 25, 1946
‘
2 Sheets-Sheet 1
,________}_____
.15
79
INYENTOR
L/4
'
BY
CECIL a 'VOKES '
‘
Abt?
June 6, 1950
2,510,440
c. G. VOKES
FILTER AND SILENCER UNIT
2 Sheets-Sheet 2
Filed Oct. 25, 1946
INVE'NTOR
CEc‘iL G. voKEs
BY
2,510,440
Patented June 6, 1950
UNITED STATES PATENT OFFICE
2,510,440
FILTER AND SILENCER UNIT
Cecil Gordon Vokes, Guildford, England, assignor
to Vokes Limited, Guildford, England
Application October 25, 1946, Serial No. 705,554
In Great Britain March 13, 1946
4 Claims.
1
This invention is designed to provide a simple
and compact form of combined ?lter and silencer
for the air intakes of internal combustion en
gines, compressors and the like, of the kind in
(Cl. 183—71)
2
has a main body part comprising a central tube
I and a concentric outer case 2. A domed cap 3,
?tted to the outer case 2, has two partitions 4, 5
de?ning a space into which the air is admitted
which the air is ?ltered and a high frequency
through circumferential slot 6. Extending into
eliminator as well as a low frequency silencing
chamber and the silencing effect of ?ltering ma
terial are employed.
the dome from the partition 4 is a central tube
1 (or possibly several tubes) of suitable design to
It is a characteristic of these devices that the
noises to be silenced are derived from the engine
or the like (hereinafter called the engine) to
wards which the air is drawn: and in those con
stituting the present invention the incoming air
constitute with the domed end the desired re
duced pressure or high frequency elimination
chamber. The central tube l of the main body
part leads from a central aperture in the other
partition 5 and is carried to the requisite length
and formation for the required frequency elimi
nation, with appropriate apertures 8 near or
passes into a zone of high frequency elimination,
through a low frequency silencing chamber and 15 at the end (or both).
A closure cap 9 is ?tted to the outer case, so
through ?brous or other silencing and ?ltering
that the air turns back into the annulus between
material in that order. An annular chamber on
the central tube and outer case. The closure cap
the engine side of the ?ltering material may form
9 may be secured by a wing-nut H1 engaging a
a further silencing chamber from which the air
is conducted by a transverse branch to the en 20 threaded rod II which may be carried by
a cross bar or spider ii at the end of the tube
gine intake. The ?lter unit embodying the ?l
8. Felt or like discs l3, M are ?tted inside the
tering material can thus be carried by or lie With
partition at the far end of the annulus and in
in a removable cap where the air flow is reversed
the closing cap respectively and make joint with
and is very readily accessible for cleaning or re
25 the ends of the tapered star-shaped or deeply
placement.
pleated ?lter unit, formed from a cylindrical ele
According to a further part of the invention
ment of the deeply pleated material by com
the entering air comes into the zone of high fre
pressing one end, so that it tapers to a smaller
quency elimination laterally, preferably radially
diameter at the end remote from the cap. Suit
towards the centre through slots in the outer
case or the equivalent, so that the opening into 30 able material for forming the element in this
way is felt or textile material 15 stitched to metal
the high frequency eliminator is opposite to the
gauze l5 or other suitable stiffening material, the
entry into the axial low frequency silencing
combined material then being formed into par
chamber through which the air next passes.
allel pleats and bent and secured in cylindrical
According to another such part the ?lter unit
is tapered to form the outer sound absorbing or 35 form, before compressing one end to reduce the
diameter and lessen the spacing of the pleats to
damping wall of a chamber converging in the di
wards that end so as to form the tapered element
rection of flow of the air emerging from the low
shown. By removing the cap 9, the ?lter ele
frequency silencer. Such a unit, when suitably
ment [5, Hi can thus be readily removed for
placed within a cylindrical or annular space,
tends to equalise the flow of the air both prior to 40 cleaning or replacement. The air which has
passed into the tapered annular space I‘! inside
and after ?ltration: it can be readily produced
the ?lter element will then emerge through the
from a star-shaped cylindrical element of ?l
?ltering material into a reversely tapered an
tering fabric and wire gauze by forming it to a
nular space I8 outside the ?lter element. The
smaller diameter towards one end or a larger
diameter towards the other or both. In other 45 space l8 communicates with a lateral branch I!)
which forms the outlet for the filtered air from
words, the material of the element is ?rst formed
the combined ?lter and silencer to the engine
with similar parallel pleats and it is subsequently
intake.
modi?ed to tapered form. A filter element so
Either tube or casing may advantageously be
formed itself constitutes an important part of
tapered
in some cases.
50
the invention.
Other suitable forms of ?lter unit may be used
A typical form is illustrated by the accompany
within the Wider aspects of the invention, for
ing drawings in which:
instance a brush type.
Fig. 1 is a central longitudinal section, and
I claim:
Fig. 2 is an end view, partly in section.
In this form, the combined ?lter and silencer 56 1. A ?lter and silencer assembly, comprising
2,510,440
3
4
a narrow inlet chamber having inlet openings,
a reduced pressure high frequency elimination
chamber opening into one side of said inlet
passage member whereby a reduced pressure is
outlet opening in the other end of said silencing
a removable closure member closing the end of
adjacent to the air receiving end of the tubular
caused in said chamber when the air is ?owing
chamber, a tubular low frequency silencing
into the said tubular passage member, an open
chamber opening at one end into the opposite 5 ended outer casing surrounding said tubular
side of said inlet chamber and closely adjacent
passage member and spaced from said chamber
said frequency elimination chamber opening, an
to de?ne an air inlet for said tubular passage,
chamber, a ?lter chamber surrounding said out
the said outer casing, a, tubular ?lter element
let opening end of said silencer chamber, a 10 Within said outer casing and surrounding said
cylindrical ?lter element dividing said ?lter
chamber into concentric sections with the inner
of said sections being in communication with said
tubular passage member, said tubular‘ ?lter ele
ment being removable from and replaceable in
the said outer casing when said closure member
silencer chamber outlet, and an outlet for ?ltered
air opening laterally from the outer of said sec
tions.
is removed, and a lateral connection from said
outer casing forming an outlet for air which has
traversed said tubular passage member and
2. In a ?lter and silencer assembly as de?ned
in claim 1, wherein said cylindrical ?lter is re
movably mounted and the end of said ?lter
chamber is closed by a removable cap which
supports one end of said ?lter.
passed through said ?lter element.
‘ 3. A ?lter and silencer assembly as de?ned in
?le of this patent:
CECIL GORDON VOKES.
REFERENCES CITED
The following references are of record in the
claim 1, wherein said cylindrical ?lter extends
the length or said ?lter ‘chamber and ‘surrounds
UNITED STATES PATENTS
Name
‘Date
said silencing chamber, said ?lter being pleated
Number
and tapered from its end of largest diameter sur
rounding the silencing chamber outlet, and said
?lter ‘chamber outlet is located behind the si
lencing ‘chamber outlet to cause the path of flow
to reverse and extend longitudinally of the ?lter 30
and towardthe smaller end thereof.
'4.v In a ?lter and silencer assembly the combi
926,070
1,702,804
2,020,581
Matchette ______ __ June '22, 1909
Winslow ________ __» Feb. 19,1 1929
Orem ___________ __ Aug. ‘11, "1936
2,085,702
\Kitto _____________ June 29, 1937
nation of an inner tubular passage member for
receiving incoming air, a chamber having an
opening opposite and spaced 'from but closely 35
2,170,902
Number
Kamrath _______ __ Aug. '29, 1939
FOREIGN PATENTS
Country
Date
367,009
Great Britain ____ __ Feb. 10, 1932
391,180
‘Great Britain ______ Apr. 18, ‘1933
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