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Патент USA US2408743

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Get. 8, 1946.
_
I
, w. R. DODGE
SELF-CLEANING
STRAINING
2,408,741
DEVICE‘
‘Filed Aug. 11, 1944
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_ Oct. 8; 1946.
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WRDODGE
_
2,408,741
'
SELF- CLEANING STRAINING DEVICE _
Filed Aug. 11, 1944
2 ShéetS-ShGet 2
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)fllzbmiii Jaye,
Patented Oct. 8, 1946’ I _ I‘
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‘sstrecms‘ me STRAINING‘DIJVICE
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R._Dodge,Aldan,Pagassignor to Hajocai l -
Cv rporation, a corporation of ‘Delaware. _ I I
pi't'Applicatien August 1 1,
_v i
' ‘
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1944. serial No. 548,939;
'1 claim. (01.210-167)
are provided forisaid openings as shown.’ .' A han- ,
' d; to ‘the basket‘ for‘ condle'or bail 25 is see re
My inventionv relates :to v'mproved method and
means for straining ?uids and liquids. .
‘
venience in handling. J
The followingiare among my objects:
‘ To improve‘ the methodii-of maintaining the
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‘less similarlto "constructions found in the prior
strainer uniticlean', .wh'ile operatingrlthereby ‘se
curing'the maximum of efficiency".
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The construction so faridescribed is more or
art_>
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.,
In accordance ‘with my invention a shearing
blade in the form of a_helix is mounted in the
‘To conserve a substanti l bulk of- foreign ma
terial'which would ordinarily go to waste.‘ r
v :To utilize the ‘pressure of the ?uid passing vfrom
basket von be'ari'ngsatv either end; T'This'shear'in'g
element is formed into'ahelix mounted upon a
;inlet» to ‘discharge :to provide the power necessary 10
rotatable shaft; ‘co-axial withthe basket-the
‘for: the cleaning operation‘; 1»
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1
perimeter of the helix having a close movable
>
To provideia shearing actionllupon the foreign
?t with the‘ inner wall ofithe basket“ 7
material adhering'f-to‘ theastr'ainer-‘unit in order
t‘olseparatei smallerrpart's of foreign matter from
larger. parts, 11in ‘order to prevent‘ unnecessary
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4wastes-
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» The jphrase"“‘fore‘ign "material? as used "in this
case‘ is intended to include any ‘particles or‘? sub
' stance in or of "the liquid that will not normally
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‘pass through the perforations;
To provide?mprovements' .in‘constru’ction; as- I
v
a
sembly and action. inorderito attain :e?iciency . , F'The plug formation 24 is
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threaded intovv the
open lower end of the housing‘ l5 ‘and serves to
close said lower end when in operation,‘or to'open
~. #Referring to; therldrawings, ‘Which. illustrate 20'
,
said'tlower
for cleaning (blow down)’ orthe
merely by way of example, suitable means for
and economy as» a;whole.._.
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{Mofeparticularly the formation 24? is funnel
:Fig. 2",isa .centralivertic lasection on they-line I‘ 25 72 4‘b'7-for; receiving the loWerTe'n'dj of the basket‘22.
‘ Belowithefunnel-‘sh'aped formation is a closure
Fig._»»3.is a“ fragmentary section‘on a‘ larger
"discizllc‘f'ori gaining-access to the housing, Where
meeting myinvemiQn—.-.»,
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- Fig._ 1C is a} ;_centr_a__l vertical; section. v
2-2
Sean
of
Fig.1‘.
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’l‘shapéd'l as ajtfillelprovided with an annular ?ange -
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a.
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{the ‘line 54-5 or
“Fig."2.:_"
“ Similar numerals
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referto
5,
similar parts
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through
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out the several views‘.
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the housing._ A plug controlled port 24d is pro
30
I" ""iFigjjla is atopv'planview' vof thejhelix'g'f _
r " I Fig; 5' is"a"plan‘ section‘ '
'by the basket may be inserted or withdrawn from
,
'_ Fig.1; isia "detail in'l'elevations of itlheshaft' for '
'
' _ The ‘device herein described suitably effecting
thejinvention, comprises"the‘chambered body or
housing l5 provided atthe top'with an'inlet port
"I6 and a discharge'port‘l'l. This housing ‘is pro
’videdwith‘ an inw'a'rdlyiprojecting annular ?ange
“l8 nearth'e topand cooperating in forming an
intakejspace' fl 9, ‘fon‘receivingthe ?uid“ entering
‘at IS. A ‘basket 22has‘a"fo‘raminous wall, that
as 26 in its
‘
vided irf-the closure
disc
274° for‘further or sup
plemental control.
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v. H The top of the housing [5 may valsoibev opened
and ‘closed by means of a ‘cover-plate; cross-bar
vand set-screws, in which case asuitable bail 25
35 maybe used. ' ‘ rI_‘his bail‘ 25 is an arch’formati'on
havinglitsi'lower ends secured to the tQ‘p'KOf the
basket‘ 22 and jfurnishesconvenient means for
v V _
‘withdrawing
the' basket from the‘ housing and for
replacing said basket within said housing. "
‘Thedevice ‘and operation, so far as above dc‘
" ' in accordance with‘the com.
' scribed, 'areil‘argely
~ mon _ practice,
tered" ~ in > said
EIAmong ' the difficulties encoun
practicejis the tendency. of the > '
t to gather upon its surface,- a '
‘is provided’with perforations‘ such
wall... This basket‘pis supporte'dfat; the top by 45 _straining baske
coating?eof foreign material, that‘ greatly- impedes
the ?ange l8. ‘ It isalsosuppoU-tediat the'bottom
by a plug if_ormation"24' threaded into‘ the bottom
of‘the housing;
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time and material.
“The ‘basket '22 ‘ is cylindrical ‘in form‘,'_'open at
the top to the intake space l9, and spaced‘ from
the surrounding wall of the housing l5.
_ theistrainingoperation and results in waste'cf
‘
This space 20, surrounding the basket, receives,
the ?uid delivered throughthe perforations.”
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Such trouble arises ‘differently indifferent types
'of'material,"and the‘ object of thelpresentinven- ‘
tion is to overcome the'f'saidi tendency», as effec
tively as possible.
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'In accordance with my invention I provide a
and delivers the same to the discharge IT.
rotating and shearing blade in the form of a
The housing is adapted to be opened‘ at the 55
helix 30, or turbine.
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top and at the bottom. Suitable closure elements
2,408,741
3
4
The perimeter of the helix is normally co-aXial
with that of the cylindrical basket.
When .a particle of foreign material is carried
by the ?owing medium into a perforation which
will not permit passage therethrough, the perfo
ration becomes closed, and the operation im
of radial arms 31 secured to the spindle or
paired. When a particle is carried into, but not
shaft 32.
entirely through, a perforation, the part that does
The shaft is mounted in bearingsof cross bars
not
pass through the same, is sheared, by the ro
33 and 34 at the top, and bottom- of the basket.
tating helix at or close to the inner surface of
These bearings are supported onsuitable cross
the basket wall, so that the remainder of the
pieces associated with the housing.
10 particle ‘lodged within ‘the ‘perforation'is released
The radial arms 3| are all ?xed upon the shaft
and carried clear of the basket wall into the hous
32. A washer 35*» is slidably mounted on shaft
ing space 20. In this way material is saved and .
32 and adapted to rest upon the cross bar 34. .A
thetimezrequired in frequent cleaning also saved.
spring 31 is positioned upon the shaft 32, between
The helix 39 is mounted upon a shaft 32, also
coaxial with the basket, by means of a number
As the rotation of the helix is continuous it fol
the lowermost radial arm 31 ~ and saidle-bearinggin_-~
-'lows thatlthereis-no time for undesirable accumu
cross bar 34. By this arrangement, when “the
lation-of particles.
helix is pushed downwardly the spring :is ‘com.
. -When.~the;partof the foreign material which
pressed; when however the spring is permitted‘ ‘
to react, the helix is slightly elevated.
When the shaft 32 is spring-actuated upward
ly,;_the washer BSlimits thisspring-actuated .up
.Ward movement oftheshaf-t-BZ.
projects into the basket is sheared from the part
‘ lodged'in said perforation there is nothing to hold
20 the balance of said foreign matter from passing
into ‘the .?ltered liquid :zpassing :through the
,
housing.
The angle ring is shownyinsections,inlligs. ,1
and .2, and comprises ;a .strip ;of .metal having
parallel extensions in planes’ at right . angles and
cooperates with the ?anges 18 in the support of
the basket.
,
[5 and thence to theoutlet or’ discharge port I'l.
‘If the, medium containsparticles of foreignma- .
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if
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»~diS1Q§lge :fromga1znerforation, the difficulty, cantbe
largely overcomerby'gthe. mounting ,of;the; helix.
Animpertant :feature :of :the invention is; that
when .the 'rnrass ;of medium projecting into the
'
Inthe usual practice, the medium tobe strained
is introduced throughinlet 16,;1ntoinlet chamber
I 9 and thence into..ibasket.22. From .basketzzthe
bulk of the medium passesthroueh the perfora
tions in the wall ofthe basket 22 to the space .29
between the basketrandthe :Wall of the housing
.
When: a up article; of z-foreign zmaterial, happens
:ztO be,.cf._.such;cha1tacter1asuto render it .di?ioult to
30
basketissheared. the sarnagqesinto an‘dibecomes
"part of >.-th;e~m,1strainie;d:mediuni :in the basket,
while the balance of ,saidxnhSs ‘medium. remain
:ineih the perioratinn willgoiintothe (strained
vinedi
.u-iirounsii-ugasaid basket.
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terial . in appreciable Quantity that will not im
This operation lay bezrepeatedzfmm time 1.1110
‘time. the :saidma-ss of: unstreined medium may
mediately pass through .theperforations in the
basket wall, thesaid materialisheld in suspen
in saving;ofitimetanmmaterial, ‘fl'llntcissto say,
sion in the ?uid until a substantialpart of same
has‘ passed through the perforations.
,Such common practice has a‘ number of objec
tions. For example-the foreign material which
is separated from thebody of the medium has a
. tendency to adhere 'v-totthe inner surface ofgthe
be reduced or even eliminated.
This williigesnlt
‘the, mass may be gradually Worn; away, or .su?i
ciently reduced, to permitiitsr passing through'the
.perforationfand become :part of the strained
medium.
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It will also {be noted‘that‘th‘e‘rotationeofthe
helical blade-within‘thebasket-will"increase the
‘basket wall. 'Ihis;interfere_s=with the straining,
agitation oftfhe?uid passing therethrollgh which
operation. This trouble increases as the accumu
lation on the basket wall increases; thus requir
will facilitate the vstraining action?
ing'frequent cleaning of .thebasket which is ex
In a ?ltering device, thehombination of acas
‘ing'ope'n at the top andbottom'andprovided at
its upper portion with .an annular, lateral, v-in
,pensiveandwasteful.
_
The means and method in accordance ‘with my
invention serve to overcome the above cited ob
jections.
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The bearings in cross bars .33 and 34 are suf
?ciently loose to permit not only vertical and ro
tative movement but alsoslightrocking or side- 1,
way motion for the purpose to be described. ..In
certain cases it may’ be desirable to provide-ball
bearings. The-helix may be made of sheetmetal
or cast and may varyin-gaugeas circumstances
require.
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The operation employing, the helixv is as follows:
The medium ?owing into the top of th,e"bask.et
22, will directly enco'unterthe helix blade.“ ‘and,
due to the differential pressure or ?ow‘from‘inlet
IE .to outlet l1, will cause the rotation of said
helix. Meanwhile part of the ~medium will pass
out through the perforations 26 into the space 20
within the housing.
.
,In accordance with the method and means of
the present invention,v these objectionsare largely
.overcome.
For example:
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‘What I claim ‘is: ,
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.wardly projeotinge?angaa hollow .plug member
'closing the ‘lower end of'the casing and provided
with anupwardly extendinginverted conical'por
tion and having ‘an outlet for.__'so'1ids.,.a perforated
open ended cylindrical basket arranged ,within
the Tcasingandspaced from. the .walls ‘thereof and
,seated'upon saidoonical portion having its. ‘upper
end arranged within the annu‘lusde?ned'bysaid
inwardly projecting ‘?ange, .cress bars provided
with beari?gs and’. located‘ in said. conical portion
andin the toppfthe baskeaja shaft journaledjin
.said bearings, ga‘he'lic'al .blade v‘mounted on said
shaft ‘in close proximity _.to ,said basket ‘for .rota
.ti'on . and for .shearingmaterial projecting from
,theinter-ior.ofth'élbasket .wall, aninlet in ‘line
with .the uppenopen end of ,thebasket and‘. an
outlet located at ‘the top of the casing ,andcom
municating with the space between the .casing
and the basket.
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2R. .DQDGE.
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