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Патент USA US2096314

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09.191991.
' D. B, BANKS Em
2,996,914
APPARATUS FOR DISLODGING FILTER CAKE FROM FILTERS
Filedvoct. 2, 1935
4 sheets-sheet 1 '
Och 19, 1937-
D. B. BANKS er A1.
2,096,314
>APPARATUS FOR DISLODGING FILTER CAKE FROM FILTERS '
Filed Oct. 2, 1955
F/G‘. 2.
4 Sheets-Sheet 2
Oct.~ 19, 1937.
D. B. BANKS Er Al.
v 2,096,314
APPARATUS FOR DISLODGING FILTER CÀKE FROM FILTERS
Filed Oct. `2, 1935
. 4 Sheets-Sheet 3
o¢1.19,1937.
~
'
D, B BANKS ETAL
2,096,314
APPARATUS FOR DISLODGING FILTER CAKE FROM FILTERS
Filed Oct. 2, 1935
4 Sheets-5h68# 4
Patented Oct. 19, 1937
2,096,314
UNITED STATES PATENT OFFICE
2,096,314
APPARATUS FOR DISLODGING FILTER CAKE
FROM FILTERS
Daniel B. Banks, Drexel Hill, and Paul D. Barton,
Merìon, Pa., assignors to Sun Oil Company,
Philadelphia, Pa., a. corporation of New Jersey
Application october 2, 1935, serial No. 43,170 '
1c claims. (o1. 21o-20o)
In an application filed by us November 26,
1934, Serial No. 754,714, we disclose a filteringv
apparatus which is especially adapted to filter
precipitated wax from mineral oil. In that ap
5 paratus a number of annular trays are arranged,
one above another, Within a tower. Each tray
comprises a filtering section, a wash section and
a filter-cake removal section. The mixture of
-oil and wax is admitted'to- the ñltering sections
10 of the trays; and a washing liquid is admitted
to the washing sections of the> trays. A number
of sets of ñlter leaves is arranged circumferen
tially over each tray. The sets of ñlter leaves
are rotated together so that each set passes suc
' cessively through a filtering section, a washing
section and a filter-cake removing section. A
vacuum is applied to the filter leaves while‘they
are in the filtering and washing sections of the
trays. When a set of ñlter leaves is in the filter
cake removing section of a tray, gas under pres
sure is applied to` said leaves in order to dis
lodge therefrom the wax that was previously de
posited thereon while such leaves were passing
through the filtering section of such tray.
. given time in communication with the gas blow
opening of the stationary valve member.
Com
municati‘on begins, of course, as soon as the ad
'vance edge of a channel passes beyond the near
edge-of the blow opening in the stationary valve
member and such communication is maintained
until the rear edge of the rotating channel passes
beyond the rear edge of the blow opening.
The )
gas blowing operation, therefore, involves a grad
ually increasing flow of gas followed by a maxi
10
mum gas flow vfollowed by a gradually decreas
ing-flow of gas.
While the operation is effective, with a suñî
cient gas pressure, to blow the ñlter cakes olf
the ñlter, it is open to certain serious objec 15
tions. 'I’he gradual application of the gas pres
sure does not establish the ideal condition re
quired to completely dislodge the wax, some of
which tends to tightly adhere to the filter leaves.
Further, the duration of the gas flow through 20
each rotating channel is prolonged, and the flow
through successive channels is-almost continu
ous, since the disconnection of one rotary chan
ble hollow vertical shaft extends along the axis
nel with the gas inflow is almost immediately
followed by connection of the next rotary chan 25
nel of the series with the gas flow. Further,
of the tower. Within this shaft is a number of
the pressure of the gas must be maintained at
' In the apparatus of said application, a revolu
vertical collecting pipes, arranged around the a high value to insure the approximately com
axis of the shaft and rotating bodily with thel plete removal of the wax cake- from the ñlter
30 shaft, having mechanical and fluid-channel con
leaves. The expense involved in an almost con 30
nection with the filter leaves so `thatl the latter
rotate with the shaft and pipes and so that
tinuous flow of gas under high pressure is a
serious factor of operating costs. In a propane
dewaxing plant, the most desirable gas to use
means are afforded for passage of filtrate and
wash'liquid from each set of filter leaves to a _ is propane and the cost of condensing the propane
corresponding pipe and for passage of gas un
gas used in the cake-removing operation is very 35
der pressure from each pipe to the correspond
considerable.
ing set of filter leaves of each tray. These pipes,
bodily rotatable, as stated, with the shaft, com
municate, at their lower ends, with vertically ex
We have discovered that the most effective way
to apply the gas pressure is to apply it in the
tending channels formed in a valve member that
rotates with the shaft. These channels may be,
and substantiallyare, mere continuations of the
short duration. The blast must, therefore, be 40
released after the channels in the two valve
members are in complete register. Such opera
tion is not only eifective to completely remove
the wax cakefrom the filter leaves, but the vol
ume of gas required is much reduced and the 45
gas pressure may also be permissively reduced.
The object of our invention is to provide a
reliable means to enable the gas pressure to be
so applied. Another object of the invention is 50
to provide means whereby the'precise time of
application of the gas pressure may be prede
termined as desired and whereby, also, the dura.
tion of the gas ñow may be predetermined as de
'aired`
pipes. They open at their ‘lower ends through
the base of the rotary valve member and are
45 adapted, in the rotation of the valve memben'to
successively communicate with a. filtrate out
let, a wash fluid outlet and a gas inlet or blow
opening, all formed in a stationary valve member
the top of which is pressed upward against the
50 base of the rotary valve member. The two out
lets named are connected with a source of vacu
um.
The blow opening is connected with a
supply of gas under pressure.
In the voperation of the apparatus only one
channel of the rotary valve member is at any
x
form of a sudden blast of maximum volume and
2
2,096,314
A preferred embodimentofl the invention is
shown in the accompanying drawings, wherein.:
Fig. 1 is a diagrammatic view of the means
for supplying successive blasts of fllter cake dis
rays; the photo-electric> cell controlling the oper
ation of- electric and mechanical means, herein
after described, for charging and discharging the
tank 31.
lodging gas.
j
_
The light apertures may be formed in any 5
Fig. 2 is a vertical sectional view of the sta
tionary and rotary valve members and of the
"electric eye” which is operable, through means
suitable devices which rotatel with the rotating
elements of the iilter. The devices that we have
devised and consider preferable will now be de- -
shown in Fig. l, to control thel admissionr of gas ' scribed (see Figs. 2, 4 and 5),.
y
10 to the channels communicating with the filter y
In our prior application above mentioned, we 10
leaves.
,
disclose a contrivance providing a mercury seal
Fig. 31s a transverse section looking in the-.di . between the rotary and stationary valve members
rection of arrows 3, 3 of Fig. 2.
f
to exclude admission >of air to the joint between
Fig. ‘i is a transverse'section looking in the di
15 rection of the arrows 4, 4 of Fig. 2.
`
Fig. 5 is an enlarged sectional view of a short
section oi!l one of the annular rotary plates and
of one of the apertures formed thereby for pas
said members, and since we mount the devices
> carrying the light apertures on this contrivance,
it will be briefly described. vSurrounding and in
tegral with `the stationary valve member 20 Vis a
laterally and upwardly extending flange 40, to the
>upper edge of which-is bolted a ring 4| support
20
The rotary valve member I0 (see Fig. 2) is pro
ing a. mercury-containing J-shaped cup 42, which
vided with tubulanchannels ||, which, at their. ’ extends within the deep annular groove formed by
upper ends, communicate with the pipes, carried the iiange 40. A ring 43 is bolted to an annular`
by the central rotary shaft of the ñltering appa
flange on the rotary valve member I0 and carries
ratus, through whichr the filtrate and the used a depending cylindrical sleeve 44 which extends
25 wash liquid are conveyed from the filter trays into cup 42 nearly to its bottom and well below
through .the rotary filter leaves, and through the bath of mercury in the cup. '
>
\
which gas under pressure is blown through the
Secured to sleeve 44 is an annular ñange 45
rotary filter leaves'to dislodge the wax therefrom. to which is«bolted an annular plate 50 having
The channels || at their lower ends assume the spaced apart arcuately extending slots 48 corre
30 shape or radial slots. The filtering 'elements are
sponding in number to the channels ||. Resting
not shown, since they form no part of the inven
on the annular plate 50 is another an-nular plate
tion.
5| having similar arcuately extending slots 49.
'I'he stationary valve member 20 is’provided The upper plate 5 I, is circumferentiaily adjustable
sage of light to the photo-electric cell.
_
with three arcuate channels, namely, a filtratev
35 outlet 2|, a wash iiuid outletd22, and a gas inlet
23, the opening‘of which is comparatively short.
measured circumferentially (see Fig. 3), so that
on the lower plate 5|) so as to provide light aper
tures, of any desired dimensions, which will regis
terwith the light rays (from the lamp 51 herein
after described) at any desired equally spaced
it cannot align, at any given point in the rotation , apart points in the rotation of the rotary elements,
of valve member I0, with more than one chan
40. nel
||.
'
`
Depending from'the base of the rotary valve
member I0 is a bolt 24 having two collars 25 and
26 between which'is conñned a spring/ 21. By
means of a roller bearing 28 on collar 26 the sta
45 tionary valve member 20 is supported, and spring
of the filter. Plate 5| will, of course,«be so jad
justed that the light apertures 4Willfregister with
40
the light rays when successive channels | | in the
rotary valve member I0 register with the blow
opening 23, but a liner adjustment than that is
desired, since it is desirable that the blast of `gas
should not be admitted to the iiow opening 2,3 and 45
2] operates to. maintain the stationary vvalve thence to a channel |`| until nearly or quite the
member pressed against the rotary valve mem
full width of the channel is open tothe blow
ber. A cap 29 depending from the base of the. . opening. Further, it is desirable to control the
v stationary valve member excludes admission; to
50 the space around the bolt and spring, of air which
might possibly leak through the bearing to the ñl
\trate or used wash ñuid ñow channels, 2| and 22.
¿instant of admission of the gas charge with-even
more accuracy, since with different wax-bearing 50
'oils the time and duration of the wax-expulsion
gas blast y'should be^ varied.- The construction
The stationary valve member 20 is connected above'described enables this line control and regu
to ,the yoke 32 by pins 3|, the yoke being support
5 ed from frame 33 in any suitable way that wi1l« lation to be accomplished. .
The plates 50 and 5| must, of course, be held in »
1
prevent- valve member 20Lfrom turning.
the fixed relation to which they are adjusted.
l.Connected with the blow opening 23 of _the sta- ' ‘ Extending
around ythe periphery of plate 50 is
tionary valve member 26 is one end of a pipe 34 a ring 52 having >an inwardly extending lowerv
whose other end /(see Fig. l) communicates with flange bolted to _plate l5|) and an inwardly 'extend-f
60 a valve chamber 35,` which is connected, through
~ ing upper ñange overhanging plate P5|) and eX
a pipe 36, with a tankror chamber-31 adapted to tending over and contacting with the peripheral `
hold, under suitable pressure, say 20 pounds gage, portion of ~plate'5|. Spring/strips 53 attached to
'intermittent charges of gas, each of a volume plate 5| extend-‘over plate, 5| and ring `52and 'i
65
equal to that intended to be admitted intermit-` thence curve around and extendl under ring 52.
tently to blow opening 23 for` transmission . By means of a"bolt and nut 54 each spring strip 65
through’each of the rotating channels .| | vas they may be tightened tcî hold it firmly against fring
successively register, ,in the `rotation of valve `52 and thereby prevent circumferential displace
`member I0, with blow opening 23.
While any channel || registers with the ‘blow
70 opening 23, the precise time of admission to theA
ment of the plate 5| upon plate 505.
By un- f
screwing the nuts on these -bolts, theßpressure'
of the spring strips'53 upon plate 5| may be re 70
lieved sufficiently to permit such plate to be read
the action upon a photo-electric cell of light rays justed as desired. The annular Íiange 45, sup
which pass through aperturesvwhich, infthe ro y.porting plates.50 and 5|, is,` in effect, a split
- tation of the rotary elements of the í-ltering appa
clamping ring which is held tightly Iabout sleeve
ratus, are moved successively into the path of said >41| by means of »a clamping bolt (not shown) so
blow opening of the gas charge is determined by
2,096,314.
l that the iixed plate 58 may be adjusted with re
spect to ysleeve 44 by loosening the clamping bolt
and moving the annular Iii'ange 45 as desired.
3 .
thereby closing valve 15 and opening valve 38 as
shown. The charge of gas in tank 31 then im
mediat/ely discharges through pipes 36 and 34
Secured to ring 4I is a frame 55 upon which is
into the blow opening 23 of the stationary valve
' mounted a cylinder 56 whose axis coincides with member and thence Vinto the aligning channel il "il
al circumferential line extending through the light of the rotary valve member i6. Thence the'
apertures 48-49. Screwed into the bottom of ' charge of gas is blown through the illter leaves
cylinder 56 is a tube 62 .carrying an incandescent (not shown) that are in open communication with
lamp 51. Within and between the top and bottom f channels Il and the wax dislodged therefrom.
10 of cylinder 56 are plano-convex lenses 58 which
From the foregoing description, it will be un 10
converge the light rays from the lamp to a focal derstood that the charge of gas is not transmitted
point within‘the light apertures 48--49 as they gradually to the filter leaves as the, mouth of a
are successively brought, in the rotation~ of the channel Il, in the rotation of the rotatable ele
rotatable elements of the apparatus, into register ments of the apparatus, starts to overlap the»
15 with such rays. Above the plates 50 and 5| is edge of the blow opening 23, and the charge -is
positioned a photo-electric cell 59.
not gradually cut oiî as the mouth of the channel
Carried on frame 55 is a support 6| for electric- l is gradually closed. On the contrary, no gas is
wire conduits 63 and 64`, the former having a ñex- " admitted to blow opening 23 until a predeter
ible section connected with tube 62. On the top mined time aiter a channel Il starts to register
20 of conduit 64 is mounted a T conduit 85, one with the blow opening and, ordinarily, not until 20
lateral arm of which carries the photo-electric after said channel is open to said blow opening to
cell 59, while the other arm is connected with the iull extent of its arcuate width. A gas blast
an electric wire conduit 66 leading to a Arelay panel of maximum volume will therefore be delivered
98 (see Fig. 1_). Through the conduits described to the filter leaves suddenly and with maximum
25 extend the wires through which current is sup
force, thereby insuring the - complete dislodg
plied from the relay panel to the photo-electric ment of the wax from the ñlter leaves. Not only
cell 59 and the lamp 51.
is the wax-dislodging power of the gas thus great
Connected with a source of supply of actuating ly increased, but the amount of gas required may
fluid intended tol‘be introduced to the tank 31 is
30 a pipe 18 (see Fig. 1) which, through a pressure
be materially reduced. In the prior apparatus
the gas pressure was required to be high and
reducing valve 69, communicatesv with a bulk
the rate of Yñowrapid during the entire time that
supply tank 1i which is under a suitable pressure,
which should be the same as that desired to be
applied to tank 31. A pipe 12 connects tanks 1i
35 witha valve chamber 13. A pipe 14 connects
a channel- Ii was open to blow opening 23 and
therefore involved the consumption of a quantity
,
valve chamber 13 with tank 31.
Within valve chamber 35 is a valve 38 having
a stem 39 extending through one wallfof a dia
phragm chamber 11 and connected with a dia
40
phragm 18 within chamber 11.
Within valve
chamber 13 is a valve 15 having a stem 16 ex
of gas materially greater than that required in the
present apparatus.
As soon as an aperture 48, 99 passes beyond
the point of impingement of the light rays, the
photo-»electric cell is rendered inactive and the
circuit through solenoid 9i is opened, and valve
88 is turned to disconnect pipes 83 and 86 and Il@
connect pipe 85 with vent 86. Thereby the pres
tendingthrough the other wall of the diaphragm .sure on opposite sides of f the diaphragm 18 is
chamber and connected with diaphragm 18. A again balanced and spring 80 operates to close
spring 80 is confined between a collar on valve valve 38 and open valve 15. The opening of valve
stem 39 and a fhged abutment 19. When the 15 allowsanother charge of gas to iiow from bulk
pressure is balanced on opposite sides of dia
tank 1i to tank 31, which is released immediately n
phragm 18, spring 80 holds valve 38 closed and 'after the rïext aperture 48, 49 moves into posi
valve 15 open, allowing a charge oi' gas to enter tion to allow the light from lamp 51 to again im
tank 31. TheY capacity of this tank, and, there
pinge upon the photo-electric cell 59.
n
-fore, the volume of »gas ,admitted thereto, isfde
What we claim and desire to protect by Letters
termined by admitting a predetermined volume of Patent is:
.
`
a suitable liquid into the tank through an inlet
pipe 8|. The gas capacity of the tank may be
reduced by admitting more liquid totank 31 and
' may be increased by drawing oil' liquid through
» 1. The combination with a iilter of a rotary
valve having a rotating member and a substan
tially stationary member, said rotating member
having an opening communicating with the iilter,
pipe 82.
i
said stationary member having a blow opening
A three-way valve chamber 81 has a pipe con
with which said opening in said rotating member
nection 83 with pipe 12, a pipe connection 85 with during its rotation is adapted to register, a gas
diaphragm chamber 11, and'a vent pipe 88 ywhich supply, a gas flow passage between the gas supply
60 may open to the atmosphere. On pipe 83 is a ’ and the Mblow opening, means to open the gas iiow 60
pressure reducing valve 84. In ~valve chamber 81 passage, and cooperating means on said rotating
is,a valve 88 having an arm which is actuated member and said stationary member adapted at
.by a solenoid 9| which is electrically connected
through wires 92 with the'relay panel 38.
'I'he relay panel 98 is of conventional type and
a predetermined point in the rotation of said
rotating member and while its opening is in
registry with said blow opening _to operate the gas
need not be described. When the photo-electric ñow opening means.
y "
cell 59 is activated by the impingementv thereon D 2. In a filtering apparatus in which gas under
' of the light rays from Llamp 51 passing through pressure is admitted through a traveling mem
a light aperture 48, 4 in plates 50, 8i, the cir
ber having aY channel communicating with a
cuit through solenoid .8 is cl
L thereby turn
illter to eiïect dislodgment therefrom of a illter
ing valve 88 into the position shown in Fig. l. cake, the combination, with said channel mem
'I'his connects' pipes 83 and 85 and the pressure ber, oi' a relatively flxed member having a blow
of the'gas thereby admitted to pipe 85 and the ‘ 'opening with whieh'the mouth of said channel
diaphragm chamber ilexes diaphragm 18 to the during its travel is adapted to register; a gas sup
right (Fig. 1) `against the action oi' spring 80,
ply, a photo-electric cell, means controlled by 75
-accenna.
4
.
ï
_
the photo-electric cell to open said blow opening
to the gas supply, and means adapted, in the
travel of said member and while its channel is ,in
registry with said blow opening, to activate said
while said channel is in registry with said blow
`opening and at a predetermined point in its'
cell at a predetermined point in the travel of said
'7. In' a filtering apparatus in which gas under
travel, to open communication through said pipe -
between said tank and the blow opening.
member, whereby the time of admission of gas ’ pressure is admitted through a traveling member
to said channel may be controlled.
"
.
having a channel communicating with a filter to;
3. In a filtering apparatus in which gas under effect dislodgment therefrom of a filter cake, the
pressure is'admitted through a traveling member combination, with said channel member, of a rel
atively fix°ed member having a blow opening with
10 having a chan'nel communicating with a filter
to effect dislodgmentr therefrom of a ,filter cake, vwhich the mouth Vof said'channel during its travel
the combination, with said channel member, of a is adapted to register, a gastank adapted to re-F
relatively fixed member having a blow opening ceive, hold and discharge successive 'charges of
with which the mouth of said channel during its gas to 'said blow opening, means, including a
15 travelis adapted to register, a >gas supply, a source of light and a photo-electric cell, con 15
photo-electric cell, 'means controlled by the trolling the discharge of gas from the tank to
photo-electric cell to open said blow opening to, the blow opening, and means moving coordinately
the» gas supply, a' sourca of light and a plate with the traveling channel adaptedgwhile said
traveling coordinately with said channel member channel is in registry with said blow opening and
and having an aperture through which, in the at a predetermined point in its travel, to expose 20
il#
0
course of travel of said plate, and while said chan
nel is in registry with the blow opening, light
, said cell to the light from said source.
8. In a filtering apparatus in which gas under
from said source is adapted to impinge upon said . vpressure is admitted through a traveling member
cell, whereby the time of admission .of said gas
25 to said channel may be controlled.
4. In a filtering apparatus in which gas under
pressure is admitted through a traveling member
having a channel communicating with a filter to
effect dislodgment therefrom of a filter cake, the
30 combination, with said channel member, of a
relatively fixed member having a blow opening
with which the mouth of said channel during its
travel isadapted to register, a gas supply, a
photo-electric cell, means controlled by the
35 photo-electric cell to open said blow opening to
the gas supply, a source of light, plates traveling
coordinately with said channel member having
light apertures through which, while said chan
nel is in registry with the blow opening, light
40 from said source is adapted to impinge upon said
cell, said plates being relatively adjustable to
vary the position in said plate of the effective
light opening provided by said apertures.
5. Ina filtering apparatus in whic gas under
45 pressureL is successively admitted through a
number'.fof rotating channels communicating
with filters to effect dislodgment therefrom of
filter cakes, the combination, withsaid rotatable
having a channel communicating with a filter to
effect dislodgment therefrom of a filter cake, the 25
combination, with said channel member of a rela
tively flxed member having a blow opening with
which the mouth of said channel during its travel
is adapted to register, a gas tank adapted to re
ceive, hold and.> discharge successive charges of 30
gas, a gas outflow passage from said tank to the
blow opening, a gas reservoir, a gas infiow pas
sage“ to said tank from said reservoir, means to
open the iirst‘gas outñow passage and close the
gas infiow passage and alternately therewith to 35
open cthe gas inflow `passage and;l close the gas
outflow passage, devices controlling the opera-y
tion of said means, and means moving coordi
nately with the traveling channel adapted to con
trol the operation of said devices at predetermined 40
pointsin the movement of said traveling channel.
9. In a filtering apparatus in which gas under
pressure is admitted through a traveling member
having a channel communicating with a filter to
effect dislodgment therefrom of a filter cake, the 45
combination, with said channel member, of a
relatively fixed member having a blow opening
with which the mouth of said. channel during its
channels, of a relatively fixed member having a travel is adapted to register, a gas tank adapted
to receive, hold and discharge successive charges 50
50 blow opening wit which the mouths of said
channels, lduring ' eir rotation, successively -of gas, a gas outflowvpassage from said tank ~to
register, a gas supply, a yphoto-electric cell, a the blow opening, a gas reservoir, a gas infiow
light“ source, means controlled by the photo-elec
tric cell to open said blow opening to the gas
55 supply, an annular “plate surrounding said chan-y
nels and rotatable therewith and having aper
tures, correspondingnin number to the channels,
through which, in the course of its rotation, and
while successive channels register with the blow
60 opening, light from said source is adapted to
impinge upon said cell.
’
6. In a filtering apparatus in which gas underI
pressure is admitted through a traveling member
having a channel communicating with a filter to
65 -effect. dislodgment therefrom of a filter cake, the
combination, with said channel member, of a
relatively fixed member having a blow opening
with which the mouth of said channel during its
travelis adapted _to register, a gas tank, a pipe
f passage to' said tank from said reservoir, valves
controlling the respective passages, meanstend
ing to open the valve in the second passage and 55
close the valve in the first passage, a pressure
a'ctuable device adapted when actuated to open
the valve in the first passage and close the vvalve
in the second passage, a third passage communi-v
cating with ysaid gas reservoir and said pressure
actuable device„ a valve in the thirdV passage
adapted in one position to open‘the, passage to»
allow pressure to be transmitted to said devic'e _
and in another _position to relieve said pressure,
,means controlling the last named- valve, and 65
means moving'coordinately with -the.traveling
Vchannel adapted, at ipredeterminedpoints in the
travel of said channel, to control the operation of
said valve-controlling means.
70 through which gas is adapted to be conveyedpfrom
l0. In a, filtering apparatus in which gas under 70
said tank to said blow opening, and means, oper-` f pressure is _admitted through a traveling memben‘
ating coordinately with the traveling ,element , havinga channel communicating with a filter td
j.
adapted while said channel mouth is not in regis- I effect dislodgment therefrom of a filter cake,»the
ter with said blow opening, to convey predeterl combination, with said-channel member, of a
75 mined charges of gas to V'said tank and adapted, relatively fixed member having a blow opening 75
5
2,096,314
with which< the mouth of said channel during its
the photo-electric cell to open said blow opening
travel is adapted to register, a gas tank adapted
to the gas supply, a source of light, plates travel
yto receive, hold and discharge successive charges
ing coordinately with said channel member hav
ing light apertures through which, while said
of gas, a gas outñow passage from said tank to
the blow opening, a gas reservoir, a gas inflow
passage to said tank from said-reservoir, valves
controlling the respective passages, means to open
one valve and close the other and alternately
therewith to open the second valve and close the
ñrst valve, devices, including a photo-electric cell,
10
adapted to control the operation of said valve
operating means, and means adapted, in the
travel of the channel member and while it is in
registry with said blow opening, to activate said
cell at a predetermined point in the travel of said
-
member.
'
11. In a ?ilteringapparatus in which gas under
pressure is successively admitted through a num
ber of rotating channels communicating with
ñlters to effect dislodgment therefrom of filter
cakes, the combination, with said rotatable chan
nels, of a relatively fixed member having'a blow
opening with which the mouths of said channels,
during their rotation, successively register, a gas
supply, a, passage between the gas supply and
the blow opening, a stationary photo-electric cell,
a stationary light source, means controlled .by
the photo-electric cell adapted to control the clos
ing and opening of said passage, an annular plate
30 surrounding said channels and rotatable there
with and having spaced apart apertures, corre
sponding in number to said channels, arranged in
a circumferential line intersecting the light rays
channel is in registry with the blow opening, light
from said source is adapted to impinge upon said
cell, said plates being relatively adjustable to
vary the position in said plate of the effective light
opening provided by said apertures, and spring
clips engaging said plates and adapted to be 10
loosened to permit said adjustment and to be
made and tightened to holdA the plates in their
adjusted position.
14. In a filtering apparatus in which gas under
pressure is admitted through a traveling member 15
having a channel communicating with a ñlter
to effect dislcdgment therefrom of a filter cake,
the combination, with said channel member, of a
relatively fixed member having a blow opening
with which the mouth of said channel during its 20
travel is- adapted to register, a gas tank adapted
to receive, hold and discharge, to said blow open
ing, successive charges of gas, a gas reservoir from
which successive charges of gas are supplied to
said tank, and means to connect said gas tank 25
alternately with said reservoir and said blow
opening.
l5. In a filtering apparatus in which gas under
pressure is admitted through a traveling mem
ber having a channel communicating with a' 30
ñlter to effect dislcdgment therefrom of a ñlter
cake, the combination, with said channel mem
ber, of a relatively iixed member having a blow
from the light source to the photo-electric cell, I opening with which the mouth of said channel
whereby, in the rotation of said plate, said photo
during its travel is 'adapted to register, a gas 35
electric 'cell is rendered alternately acti-ve and tank adapted to receive, hold and discharge, to
inactive at predetermined points in the rotation said blow opening, successive charges of gas, a.
of said channels.
‘
'
gas reservoir from which successive charges of
12.' In a filtering apparatus in which gas under gas are supplied to said tank, means adapted to
pressure
is
successively
admitted
through
a
num
40
connect said gas tank alternately with s'aid res 40
ber of rotating channels communicating with ervoir and said blow opening, and means moving
ñlters to effect dislcdgment therefrom of' filter ' coordinately with the traveling channel and
cakes, the combination, with'said rotatable chan
nels, of a relatively fixed member having a blow
opening with which the mouths of said channels,
during their rotation, successively register, a gas
50
adapted, at predetermined points in its travel, to>
render the ñrst named means operative to effect
said alternate operation.
45
16. In a iiltering apparatus in which gas under
supply, a photo-electric cell, a light source, means
controlled by the photo-electric cell to open said
blow opening to the gas supply, two annular
pressure is admitted through a traveling mem
ber having a channel communicating with a iìlter-
plates> surrounding said channels and rotatable
therewith, said- plates each having light aper
tures, corresponding in number to the number of
the combination, with said channel member, of, 50
rotating channels, through which, in the course
of their rotation, light from said source is
55 adapted to impinge upon said cell, said plates be
ing circumferentially adjustable, one relatively
to the other, to predetermine the points in their
rotation whereat the photo-electric cell is actu
ated by the light from said source.
13. In a ñltering apparatus in which gas under
pressure is admitted through a traveling mem
ber having a channel communicating with a
ñlter to eiîect dislcdgment therefrom of a filter
cake, the combination, with said channel mem
65 ber, of a relatively fixed member having a blow
opening with which the mouth of said channel
during its travel is adapted to register, a gas sup
60
ply, a photo-electric cell, means controlled by
to effect dislcdgment therefrom of a iilter' cake, ~
a relatively fixed member 'having a blow open
ing with which the mouth of said channel dur
ing its travel is adapted to register, a gas tank
adapted to receive, hold and discharge to said
blow opening, successive charges of gas,-a gas 55
reservoir from which successive charges 'of gas
are supplied to said tank, means, including a
photo-electric cell, a source of light, and mech
anism controlled thereby, adapted to connect
said‘gas tank alternately with said reservoir and 60
said blow opening, and means, moving coordi
nately with the travelingchannel and adapted, at
predetermined points in its travel, to render said
photo-electric cell alternately active and inac
tive and thereby effect said alternate operation. 65
DANIEI.. B. BANKS.
PAUL D. BARTON.
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