CA1056877A - Fast-release aerator for materials-handling - Google Patents
Fast-release aerator for materials-handlingInfo
- Publication number
- CA1056877A CA1056877A CA285,408A CA285408A CA1056877A CA 1056877 A CA1056877 A CA 1056877A CA 285408 A CA285408 A CA 285408A CA 1056877 A CA1056877 A CA 1056877A
- Authority
- CA
- Canada
- Prior art keywords
- piston
- port
- air
- reservoir
- inlet port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/54—Large containers characterised by means facilitating filling or emptying
- B65D88/64—Large containers characterised by means facilitating filling or emptying preventing bridge formation
- B65D88/70—Large containers characterised by means facilitating filling or emptying preventing bridge formation using fluid jets
- B65D88/703—Air blowing devices, i.e. devices for the sudden introduction of compressed air into the container
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compressor (AREA)
- Reciprocating Pumps (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Jet Pumps And Other Pumps (AREA)
- Air Transport Of Granular Materials (AREA)
Abstract
FAST-RELEASE AERATOR FOR MATERIALS-HANDLING
Abstract of the Disclosure A unit for transferring a charge of air under pressure from a reservoir or accumulator to a container of dispensable or flowable material of granular or like nature.
The unit is in the form of a hollow body having at one end a flange for connection to the reservoir, at its other end an inlet for receiving air under pressure, at one side a flange for connection to the container and an interior piston-valve operative first to enable charging of the reservoir with a large volume of air under pressure and second to release the reservoir air rapidly into the container.
Abstract of the Disclosure A unit for transferring a charge of air under pressure from a reservoir or accumulator to a container of dispensable or flowable material of granular or like nature.
The unit is in the form of a hollow body having at one end a flange for connection to the reservoir, at its other end an inlet for receiving air under pressure, at one side a flange for connection to the container and an interior piston-valve operative first to enable charging of the reservoir with a large volume of air under pressure and second to release the reservoir air rapidly into the container.
Description
,G877 This invention relates to a quick release aeration system, and more particularly to a unit for transferring a charge of air under pressure from a reservoir or accumulator to a container of dispensable or flowable material of granular or like nature. At least one form of aerator for the above purposes has been patented and is the subject matter of assignee's U.S. Patent to Matson 3,788,527.
Aerators of this type find particular utility in starting - and facilitatiny the movement of granular and like materials stored or contained in bins, silos, elevators, hoppers, conveyors and the like, the'purpose of the aerator being to store a large volume of air under pressure and then to ' release it into the bin etc., producing the equivalent of a ; dull "explosion" that acts on even the most stubborn material.
'Su~m'a'ry'of'the In`ven'tion In the Matson patented aerator, the main chamber ~' or body becomes integrated with the reservoir at its attach-ment to a container or like vessel as via welding. According to the present invention, there is provided a unit body '~
Aerators of this type find particular utility in starting - and facilitatiny the movement of granular and like materials stored or contained in bins, silos, elevators, hoppers, conveyors and the like, the'purpose of the aerator being to store a large volume of air under pressure and then to ' release it into the bin etc., producing the equivalent of a ; dull "explosion" that acts on even the most stubborn material.
'Su~m'a'ry'of'the In`ven'tion In the Matson patented aerator, the main chamber ~' or body becomes integrated with the reservoir at its attach-ment to a container or like vessel as via welding. According to the present invention, there is provided a unit body '~
2~ containing the piston valve and flange-connectible to each of ~' the reservoir and container, thus making installation easy and enabling the use of several units with!one or more reservoirs or one or more containers. The piston is movable . . . .
initially by air under pressure to a position in which it covers the side dischar~e port, and the piston has a passage ~ ~axially therethrough by means of which inlet air can flow ~ --.~ , .
- to charge the reservoirs. When the valve admitting air to the inlet of the unit body is closed, the'air trapped between ~ ' that valve and the piston valve keeps the piston in its charging position and reservoir air is stored, because it ~! cannot flow to the container. When the control valve is moved to allow the trapped air to escape to atmosphere, ~'` the piston valve returns rapidly to its position in ,, ;
which it uncovers the discharge port and at the same time - ~
, , . . :: , , ~ 6877 ~ -widely opens the reservoir charge port, result~ng in a rush of stored air into ~he container.
The piston valve may be inexpensively made of non-metallic material, thus providing longer life. The flange connection to the reservoir may include a spacer incorporating a piston stop or seat that may be easily replaced. The passage through the piston valve eliminates costly and com-plicated valving.
Thus, the present invention is defined as a quick release aeration system including a pressure source; a gravity discharge container for flowable materials; and aerator including a hollow body having an inlet port at one -~
end connected to the pressure source, a charge port at the other end, a tapered seating surface defined by the body internal thereto ad~acent the charge port and a side dis-charge port disposed between the inlet port and the charge port and connected to the gravity discharge container, a unitary piston slidably disposed in the hollow body the piston defining a passage therethrough and the piston defining a tapered seating surface on one end thereof adapted to mate with the tapered seating surface of the ;~ hollow body; an air r~servoir connected to the charge port ~;
for storing air at increasing pr~essures; valve means ;~
associated with the pressure source and the inlet port and ;
adapted in one position to pressurize the inlet port and in another position to release pressure from the inlet port, whereby when the lnlet port is pressurized the piston assumes ' - a first position blocking communication between the side discharge port snd the charge port and allowing air to pass :, .
from the inlet port through the passage in the piston to the reservoir and when the inlet port i9 depressurized the piston instantaneously moves to a second position allowing communi~
cation between the charge port and the side discharge port ,.
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to allow a rush of pressuriæed air from the reservoir through the side discharge port to the container of flowable material.
Description of the Drawings Figure 1 is an elevation of the assembly of unit, reservoir and container, only a portion of the container being shown, Figure 2 is a view of the Figure 1 structure as seen at right angles to Figure 1. . `
10Figure 3 is an enlarged vertical section through the ~:-charge unit or body of Figure 1. . .
Figure 4-is a partial sectional view of a modified form of the structure shown in Figure 3, .- .
Figure S is a diagrammatic view illustrating but one . .
of many circuits in which the invention may be incorporated.:: ~.
Figure 6 is a sectional view of a modified embodiment of a portion of the structure shown in Figure 3.
Figure 7 is a sectional view of a modified embodiment of a portion of the structure shown.in Figure 3.
;'~ . , : ` :
~ 20De~cription of Preferred Embodiments of the Invention ..
! , . .
:Reference will be had first to Figure 5 as presenting .:.
:: . .:
- an overall picture. Here is shown at 10 an air compressor .-; :
:~ :
~: of known type connected via a typical three-way valve 12 to : a suppl.y circuit 14 having three branches 16, each connected :~ to the inlet end 18 of a charge unit or body 20, Each body :~-:~ . is selectively connectible to a reservoir or accumulator 22 .`
~ ~and to a con~ainer, vessel or the like 24.
.~ -, ,:
`~ 30 .. ~.~-, ~
~ .' ~ - .
't ' ' ' : ' ' _2a- .
Figure 1 best shows the basic and interior structure of the unit or body 20, which is preferably cylindrical and tubular or hollow to contain a piston or piston valve 26 of any suitable material, although preferably non-metallic for longer life, ease of manufacture, etc. The piston carries two air tight seals, such as "O" rings 28, and has a relatively ~
small axial passage 30 running end-to-end therethrough. : :.
The body 20 is capped at one end by a circular plate 32 welded or otherwise rigidly affixed to the body, and this ~-plate is centrally apertured at 34 in axial alinement with the :~ -piston outside of the plate 32 and is internally threaded to receive any conventional mating fitting (not shown) for effect-ing connect.ion to the supply branch or line 16. ;
The opposite end of the body 20 may be referred to as ..
the`charge end, indicated at 38, and is open to provid~ a charge ::~
'::
i port 40. A circular or annular flange 42 is disposed radially ::
. .
to the axis of the body 20 and is welded to the body in:. :
' :: ::
surrounding relation to the charge port. An annular spacing ;.
.
`. member 44 overlies the outer ~here top~ surface of the flange .:
:- , 42 and incorporates a piston stop or seat 46 of tubular form ~
~ which fits and dPpends into the charge end 38 and only slightly ::.
- reduces the size of the charge port 40. The flange and spacer -~
~ : member are suitably apertured at 48 in-circumferentially spaced .: .
.
relation to.accomodate bolts 50 for attachment to a matching .:. .
flange 52 on the reservoir 22. At this point it should be . .
noted that, although the main axis of the body 20 is shown as ....
vertical, the body may be otherwise oriented and the particular illustration does not constitute a limitation on the invention. ~- .... ..
When the piston 26 is in its discharge position as :.
shown in Figure 3, it uncovers a discharge port formed in a portlon o the side wall of the body 20. In a form of the in~
vention, as shown particularly in Figures 2 and 3, there is welded to the side of the body in coaxial or registering -i :.- : .
., ' , ~ - .
initially by air under pressure to a position in which it covers the side dischar~e port, and the piston has a passage ~ ~axially therethrough by means of which inlet air can flow ~ --.~ , .
- to charge the reservoirs. When the valve admitting air to the inlet of the unit body is closed, the'air trapped between ~ ' that valve and the piston valve keeps the piston in its charging position and reservoir air is stored, because it ~! cannot flow to the container. When the control valve is moved to allow the trapped air to escape to atmosphere, ~'` the piston valve returns rapidly to its position in ,, ;
which it uncovers the discharge port and at the same time - ~
, , . . :: , , ~ 6877 ~ -widely opens the reservoir charge port, result~ng in a rush of stored air into ~he container.
The piston valve may be inexpensively made of non-metallic material, thus providing longer life. The flange connection to the reservoir may include a spacer incorporating a piston stop or seat that may be easily replaced. The passage through the piston valve eliminates costly and com-plicated valving.
Thus, the present invention is defined as a quick release aeration system including a pressure source; a gravity discharge container for flowable materials; and aerator including a hollow body having an inlet port at one -~
end connected to the pressure source, a charge port at the other end, a tapered seating surface defined by the body internal thereto ad~acent the charge port and a side dis-charge port disposed between the inlet port and the charge port and connected to the gravity discharge container, a unitary piston slidably disposed in the hollow body the piston defining a passage therethrough and the piston defining a tapered seating surface on one end thereof adapted to mate with the tapered seating surface of the ;~ hollow body; an air r~servoir connected to the charge port ~;
for storing air at increasing pr~essures; valve means ;~
associated with the pressure source and the inlet port and ;
adapted in one position to pressurize the inlet port and in another position to release pressure from the inlet port, whereby when the lnlet port is pressurized the piston assumes ' - a first position blocking communication between the side discharge port snd the charge port and allowing air to pass :, .
from the inlet port through the passage in the piston to the reservoir and when the inlet port i9 depressurized the piston instantaneously moves to a second position allowing communi~
cation between the charge port and the side discharge port ,.
~6~7~
to allow a rush of pressuriæed air from the reservoir through the side discharge port to the container of flowable material.
Description of the Drawings Figure 1 is an elevation of the assembly of unit, reservoir and container, only a portion of the container being shown, Figure 2 is a view of the Figure 1 structure as seen at right angles to Figure 1. . `
10Figure 3 is an enlarged vertical section through the ~:-charge unit or body of Figure 1. . .
Figure 4-is a partial sectional view of a modified form of the structure shown in Figure 3, .- .
Figure S is a diagrammatic view illustrating but one . .
of many circuits in which the invention may be incorporated.:: ~.
Figure 6 is a sectional view of a modified embodiment of a portion of the structure shown in Figure 3.
Figure 7 is a sectional view of a modified embodiment of a portion of the structure shown.in Figure 3.
;'~ . , : ` :
~ 20De~cription of Preferred Embodiments of the Invention ..
! , . .
:Reference will be had first to Figure 5 as presenting .:.
:: . .:
- an overall picture. Here is shown at 10 an air compressor .-; :
:~ :
~: of known type connected via a typical three-way valve 12 to : a suppl.y circuit 14 having three branches 16, each connected :~ to the inlet end 18 of a charge unit or body 20, Each body :~-:~ . is selectively connectible to a reservoir or accumulator 22 .`
~ ~and to a con~ainer, vessel or the like 24.
.~ -, ,:
`~ 30 .. ~.~-, ~
~ .' ~ - .
't ' ' ' : ' ' _2a- .
Figure 1 best shows the basic and interior structure of the unit or body 20, which is preferably cylindrical and tubular or hollow to contain a piston or piston valve 26 of any suitable material, although preferably non-metallic for longer life, ease of manufacture, etc. The piston carries two air tight seals, such as "O" rings 28, and has a relatively ~
small axial passage 30 running end-to-end therethrough. : :.
The body 20 is capped at one end by a circular plate 32 welded or otherwise rigidly affixed to the body, and this ~-plate is centrally apertured at 34 in axial alinement with the :~ -piston outside of the plate 32 and is internally threaded to receive any conventional mating fitting (not shown) for effect-ing connect.ion to the supply branch or line 16. ;
The opposite end of the body 20 may be referred to as ..
the`charge end, indicated at 38, and is open to provid~ a charge ::~
'::
i port 40. A circular or annular flange 42 is disposed radially ::
. .
to the axis of the body 20 and is welded to the body in:. :
' :: ::
surrounding relation to the charge port. An annular spacing ;.
.
`. member 44 overlies the outer ~here top~ surface of the flange .:
:- , 42 and incorporates a piston stop or seat 46 of tubular form ~
~ which fits and dPpends into the charge end 38 and only slightly ::.
- reduces the size of the charge port 40. The flange and spacer -~
~ : member are suitably apertured at 48 in-circumferentially spaced .: .
.
relation to.accomodate bolts 50 for attachment to a matching .:. .
flange 52 on the reservoir 22. At this point it should be . .
noted that, although the main axis of the body 20 is shown as ....
vertical, the body may be otherwise oriented and the particular illustration does not constitute a limitation on the invention. ~- .... ..
When the piston 26 is in its discharge position as :.
shown in Figure 3, it uncovers a discharge port formed in a portlon o the side wall of the body 20. In a form of the in~
vention, as shown particularly in Figures 2 and 3, there is welded to the side of the body in coaxial or registering -i :.- : .
., ' , ~ - .
- 3 -.
7~
~elation to the discharge port 54 a tubular part 56 to the ~uter end of which is welded a flange 58 very much like the :
flange 42. The flange 58 is suitably and removably connected to a matching flange 60 on the container 24 as shown in Figure 2.
As shown in Figure 4, the tubular part 56 may be :-replaced by a welded-on tubular part 56a, which is internally :
threaded at 56b to receive an externally threaded second ;
tubular part 56c which has-welded to its outer end a flange :
58a very much like the flange 58. This design has the ad- .
vantage that parts, like 56c, of diameters different from that of the part S6, may be used to vary the size of the discharge to the container. ; -`
As those familiar with the art know, the valve 12 , has three positions, one in which the compressor 10 supplies air to the lines 14 and 16, one in which air from the lines 14 and 16 is discharged.to atmosphere and another in which .
air is t~rapped in the lines 14:and 16. In the condition of the parts as appearing in Figure 3, the valve 12 is in a nonsupply position and the piston 26 is in such position that both the charge port 4Q and discharge port 54 are open.
The reservoir 22 is empty of compressed air.
When the valve 12 is moved to its supp'y position, `~
wlth the compressor 10 running, the air delivered forces the~
piston 26 to move (here upwardly) to cover the discharge~
port 54~so that no air flows to the container 24. It should be~observed that the diameter o the passage 30 is quite small compared to the area of the bottom~face of the piston 26, so that the piston moves as aforesaid and is retained in~
that position while air flows through the passage 30 and -:
through the charge port 40 to accumulate in the reservoir : .
22. The valve~12 traps air in the lines 14 and 16 and also ~.
beIow the piston 26 so that the piston remains in position to , ', ~.
,~ ~ ' ,''.
,, , . , ,: , , ,. . ~ :, . , .. , . , . . : . :. . .
~5~i~}77 ~ er or block the discharge port 54. Air under pressure is thus stored in the reservoir until needed.
When an occasion arises involving the need for re-leasing a "jam" in the container 24, the valve 12 is operated to release, or to discharge to atmosphere, and the trapped airin the lines 14 and 16 and beneath the piston is ~uickly vented, followed immediately by return of the piston 26 to - -its Figure 3 position and an "explosive" rush of air from the reservoir via the ports 40 and 54 into the container.
As explained in the above-identified Matson patent, the process is repeated as often as is necessary, which is a relatively simple operation when the valve 12 (or several valves when used) is operated remotely, by timers, sequence switches, etc.
The simple connections available by the flange mountings afford great flexibility in mounting and dismounting of the unit or units 20 for replacement, repair, use else-where etc. The parts may be easily fabricated from available tubular stock welded together in suitable configurations, that shown here being representative.
Figures 6 and 7 illustrate slightly modified forms of the piston and body arrangement. Both of these embodiments function in substantially the same manner as the embodiment .
illustrated in Figure3 the operation of which has been des-cribed.
:, .
j~ In the embodiment o Figure 6 an annular flange 62 is shown which is connected to a reservoir 22 (not shown).
:t : , ~, ~ The flange 62 defines a central opening 64 in communication with the reservoir. The flange 62 includes a circular recess 65 surrounding the opening 64. A flange 66 is disposed~radially to the axis of the body 67 and is welded to the body in sur-.
rounding relation to a charge port 68. ~n annular insert 70 -' is shown including a radial flange section 71 ada~ted to be ,~, . ' ,', ' ; _ 5 _ , . , . '' ' ' , "' ,.: . ,., . - . . ,, ,.,........ , , -, ~ . ~, . .. : . ,, 56~77 movably secured between the flanges 62 and 66 and a tapered seat section 72 which extends downwardly into the charge end 73. A gasket 75 is disposed between the flanges 62 and 66 which are secured together by a plurality of circumferentiall~
arranged bolts 76.
A piston or piston valve 77 of any suitable material is shown slidably disposed in the body. The piston carries an air-tight seal 78 such as for example an "O" ring. The piston also includes a central passage 80 running end-to-end there-.
through adapted to communicate fluid pressure from the inletto the reservoir. The piston also includes a flat end section 81 and a tapered seating section 82 which is adapted to sealingly éngage the tapered seat section 72 of the insert 70 when the piston is in its charge position blocking the discharge port 54. One important advantage of this arrangement is that when the sea-t section 72 wears such that the sealing engagement with the piston becomes impaired, the entire insert 70 may simply be removed and replaced. This is particularly beneficial when the aerator is operating in a corrosive environment which tends to accelerate wear o~ the seat.
Figure 7 illustrates a piston and housing arrangement wherein the piston seat and stop is integral with the housing.
An annular flange 85 is provided with a central opening 86 adapted for communication with the reservoir, not shown. The flange 85is adapted to be secured to a mating flange on the reservoir by a plurality~of circumferentially arranged bolts extending through apertures 87. The body 88 includes a side wall 90 which defines a first chamber 91. The opening 86 includes a side wall 92 which defines a second chamber 93 having a smaller diameter than the chambe~r 91. A tapered wall section 95 extends between side walls 90 and 92 and serves as a seat for the piston -: .
'"
' - 6 -., ' .,` ' .
, . . , . , .,- . . . ... .. . . . . . . .. .. . .
`- A piston 96 is shown in the form of a spool valve slidably disposed in chamber 91. The piston includes a first ~, lan~ section 97 and a second land section 98 joined by a spool section 99. The piston may be made of any suitable material such as polyurethane plastic or the like. The land section 97 has an outer diameter slightly larger than the outer dia-meter of the land section 98. An air-tight seal 100 is carried by the land section 97 and sealingly engages the wall 90 to prevent the passage of air therebetween. The land 98 includes a flat end section 102 and a tapered seating section 103 which is adapted to sealingly engage the tapered wall-section 95 when the piston is in its charge position as illus-trated in Figure 7. The piston also include~i a central passage 105 running end-to-end therethrough adapted to communicate air under pressure from the inlet to the reservoir. The body 88 must be slightly modified at the inlet end such that the circular plate 32 is removable to allow for insertion of the piston 96.
One important advan-tage of this arrangement is that the piston stop and seating arrangement are integral with the housing re-ducing the number of parts for assembly.
WHAT IS CLAIr~lED IS:
:
.. . .
.. ' ' ' ~
.
'`.,i ' , ~'':
. . : .:: ~ .
: ,.. ~, . . , .:
' ' .
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` ':, - ."
~: :
7~
~elation to the discharge port 54 a tubular part 56 to the ~uter end of which is welded a flange 58 very much like the :
flange 42. The flange 58 is suitably and removably connected to a matching flange 60 on the container 24 as shown in Figure 2.
As shown in Figure 4, the tubular part 56 may be :-replaced by a welded-on tubular part 56a, which is internally :
threaded at 56b to receive an externally threaded second ;
tubular part 56c which has-welded to its outer end a flange :
58a very much like the flange 58. This design has the ad- .
vantage that parts, like 56c, of diameters different from that of the part S6, may be used to vary the size of the discharge to the container. ; -`
As those familiar with the art know, the valve 12 , has three positions, one in which the compressor 10 supplies air to the lines 14 and 16, one in which air from the lines 14 and 16 is discharged.to atmosphere and another in which .
air is t~rapped in the lines 14:and 16. In the condition of the parts as appearing in Figure 3, the valve 12 is in a nonsupply position and the piston 26 is in such position that both the charge port 4Q and discharge port 54 are open.
The reservoir 22 is empty of compressed air.
When the valve 12 is moved to its supp'y position, `~
wlth the compressor 10 running, the air delivered forces the~
piston 26 to move (here upwardly) to cover the discharge~
port 54~so that no air flows to the container 24. It should be~observed that the diameter o the passage 30 is quite small compared to the area of the bottom~face of the piston 26, so that the piston moves as aforesaid and is retained in~
that position while air flows through the passage 30 and -:
through the charge port 40 to accumulate in the reservoir : .
22. The valve~12 traps air in the lines 14 and 16 and also ~.
beIow the piston 26 so that the piston remains in position to , ', ~.
,~ ~ ' ,''.
,, , . , ,: , , ,. . ~ :, . , .. , . , . . : . :. . .
~5~i~}77 ~ er or block the discharge port 54. Air under pressure is thus stored in the reservoir until needed.
When an occasion arises involving the need for re-leasing a "jam" in the container 24, the valve 12 is operated to release, or to discharge to atmosphere, and the trapped airin the lines 14 and 16 and beneath the piston is ~uickly vented, followed immediately by return of the piston 26 to - -its Figure 3 position and an "explosive" rush of air from the reservoir via the ports 40 and 54 into the container.
As explained in the above-identified Matson patent, the process is repeated as often as is necessary, which is a relatively simple operation when the valve 12 (or several valves when used) is operated remotely, by timers, sequence switches, etc.
The simple connections available by the flange mountings afford great flexibility in mounting and dismounting of the unit or units 20 for replacement, repair, use else-where etc. The parts may be easily fabricated from available tubular stock welded together in suitable configurations, that shown here being representative.
Figures 6 and 7 illustrate slightly modified forms of the piston and body arrangement. Both of these embodiments function in substantially the same manner as the embodiment .
illustrated in Figure3 the operation of which has been des-cribed.
:, .
j~ In the embodiment o Figure 6 an annular flange 62 is shown which is connected to a reservoir 22 (not shown).
:t : , ~, ~ The flange 62 defines a central opening 64 in communication with the reservoir. The flange 62 includes a circular recess 65 surrounding the opening 64. A flange 66 is disposed~radially to the axis of the body 67 and is welded to the body in sur-.
rounding relation to a charge port 68. ~n annular insert 70 -' is shown including a radial flange section 71 ada~ted to be ,~, . ' ,', ' ; _ 5 _ , . , . '' ' ' , "' ,.: . ,., . - . . ,, ,.,........ , , -, ~ . ~, . .. : . ,, 56~77 movably secured between the flanges 62 and 66 and a tapered seat section 72 which extends downwardly into the charge end 73. A gasket 75 is disposed between the flanges 62 and 66 which are secured together by a plurality of circumferentiall~
arranged bolts 76.
A piston or piston valve 77 of any suitable material is shown slidably disposed in the body. The piston carries an air-tight seal 78 such as for example an "O" ring. The piston also includes a central passage 80 running end-to-end there-.
through adapted to communicate fluid pressure from the inletto the reservoir. The piston also includes a flat end section 81 and a tapered seating section 82 which is adapted to sealingly éngage the tapered seat section 72 of the insert 70 when the piston is in its charge position blocking the discharge port 54. One important advantage of this arrangement is that when the sea-t section 72 wears such that the sealing engagement with the piston becomes impaired, the entire insert 70 may simply be removed and replaced. This is particularly beneficial when the aerator is operating in a corrosive environment which tends to accelerate wear o~ the seat.
Figure 7 illustrates a piston and housing arrangement wherein the piston seat and stop is integral with the housing.
An annular flange 85 is provided with a central opening 86 adapted for communication with the reservoir, not shown. The flange 85is adapted to be secured to a mating flange on the reservoir by a plurality~of circumferentially arranged bolts extending through apertures 87. The body 88 includes a side wall 90 which defines a first chamber 91. The opening 86 includes a side wall 92 which defines a second chamber 93 having a smaller diameter than the chambe~r 91. A tapered wall section 95 extends between side walls 90 and 92 and serves as a seat for the piston -: .
'"
' - 6 -., ' .,` ' .
, . . , . , .,- . . . ... .. . . . . . . .. .. . .
`- A piston 96 is shown in the form of a spool valve slidably disposed in chamber 91. The piston includes a first ~, lan~ section 97 and a second land section 98 joined by a spool section 99. The piston may be made of any suitable material such as polyurethane plastic or the like. The land section 97 has an outer diameter slightly larger than the outer dia-meter of the land section 98. An air-tight seal 100 is carried by the land section 97 and sealingly engages the wall 90 to prevent the passage of air therebetween. The land 98 includes a flat end section 102 and a tapered seating section 103 which is adapted to sealingly engage the tapered wall-section 95 when the piston is in its charge position as illus-trated in Figure 7. The piston also include~i a central passage 105 running end-to-end therethrough adapted to communicate air under pressure from the inlet to the reservoir. The body 88 must be slightly modified at the inlet end such that the circular plate 32 is removable to allow for insertion of the piston 96.
One important advan-tage of this arrangement is that the piston stop and seating arrangement are integral with the housing re-ducing the number of parts for assembly.
WHAT IS CLAIr~lED IS:
:
.. . .
.. ' ' ' ~
.
'`.,i ' , ~'':
. . : .:: ~ .
: ,.. ~, . . , .:
' ' .
""''.' ~ - 7 -'.:.' ' - :
` ':, - ."
~: :
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A quick release aeration system including a pressure source; a gravity discharge container for flowable materials; an aerator including a hollow body having an inlet port at one end connected to said pressure source, a charge port at said other end, a tapered seating surface defined by said body internal thereto adjacent said charge port and a side discharge port disposed between said inlet port and said charge port and connected to said gravity discharge container, a unitary piston slidably disposed in said hollow body said piston defining a passage therethrough and said piston defining a tapered seating surface on one end thereof adapted to mate with said tapered seating surface of said hollow body; an air re-servoir connected to said charge port for storing air at increasing pressures; valve means associated with said pressure source and said inlet port and adapted in one position to pressurize said inlet port and in another position to release pressure from said inlet port, whereby when said inlet port is pressurized said piston assumes a first position blocking communication between said side discharge port and said charge port and allowing air to pass from said inlet port through said passage in said piston to said reservoir and when said inlet port is de-pressurized said piston instantaneously moves to a second position allowing communication between said charge port and said side discharge port to allow a rush of pressurized air from said reservoir through said side discharge port to said container of flowable material.
2. A quick release aeration system as in claim 1 in which said piston comprises a spool valve including a first land section, a second land section of lesser diame-ter than said first land section and a spool section connecting said first and second land sections.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/727,397 US4051982A (en) | 1974-09-09 | 1976-09-29 | Fast release aerator for materials handling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1056877A true CA1056877A (en) | 1979-06-19 |
Family
ID=24922481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA285,408A Expired CA1056877A (en) | 1976-09-29 | 1977-08-24 | Fast-release aerator for materials-handling |
Country Status (5)
| Country | Link |
|---|---|
| CA (1) | CA1056877A (en) |
| DE (1) | DE2742333C2 (en) |
| FR (1) | FR2366503A1 (en) |
| GB (1) | GB1562526A (en) |
| MX (1) | MX144246A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2429952A1 (en) * | 1978-06-27 | 1980-01-25 | Simoens Herve | Valve for sudden pressure release - has side outlet and piston with central hole blocked by pin when retracted |
| DE3151026A1 (en) * | 1981-12-23 | 1983-07-07 | Agrichema Handelsgesellschaft für Chemikalien, Industrieerzeugnisse und landwirtschaftlichen Bedarf mbH, 6501 Budenheim | Air expulsion device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2716997A (en) * | 1949-11-28 | 1955-09-06 | Exxon Research Engineering Co | Quick release timing valve |
| US3788527A (en) * | 1973-01-22 | 1974-01-29 | Martin Eng Co | Quick-release aerator for introducing high pressure air into a container to facilitate dispensing |
| US3958722A (en) * | 1974-11-20 | 1976-05-25 | Acf Industries, Incorporated | Self indexing elbow |
| US4165820A (en) * | 1975-01-29 | 1979-08-28 | Acf Industries, Incorporated | Aerator control arrangement |
| US3942684A (en) * | 1975-04-10 | 1976-03-09 | Martin Engineering Co. | Air accumulator and aerator for materials-handling |
| US3969996A (en) * | 1975-04-10 | 1976-07-20 | Dec International, Inc. | Apparatus for liquid smoke regeneration |
-
1977
- 1977-08-09 FR FR7724567A patent/FR2366503A1/en active Granted
- 1977-08-24 CA CA285,408A patent/CA1056877A/en not_active Expired
- 1977-09-07 MX MX17049377A patent/MX144246A/en unknown
- 1977-09-20 DE DE19772742333 patent/DE2742333C2/en not_active Expired
- 1977-09-27 GB GB4018177A patent/GB1562526A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| MX144246A (en) | 1981-09-17 |
| FR2366503A1 (en) | 1978-04-28 |
| GB1562526A (en) | 1980-03-12 |
| FR2366503B1 (en) | 1983-03-25 |
| DE2742333A1 (en) | 1978-03-30 |
| DE2742333C2 (en) | 1983-01-13 |
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