CA1311691C - Silencer for pneumatic grain conveyor - Google Patents
Silencer for pneumatic grain conveyorInfo
- Publication number
- CA1311691C CA1311691C CA000574278A CA574278A CA1311691C CA 1311691 C CA1311691 C CA 1311691C CA 000574278 A CA000574278 A CA 000574278A CA 574278 A CA574278 A CA 574278A CA 1311691 C CA1311691 C CA 1311691C
- Authority
- CA
- Canada
- Prior art keywords
- outlet
- air outlet
- air
- inlet
- cyclone separator
- 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 - Lifetime
Links
- 230000003584 silencer Effects 0.000 title claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 39
- 238000004140 cleaning Methods 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000428 dust Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
- B65G53/24—Gas suction systems
Abstract
SILENCER FOR PNEUMATIC GRAIN CONVEYOR
Abstract A silencer (70) which is particularly adapted for use with a pneumatic grain conveyor (10) includes a housing (72) with an arrangement of internal baffles (78, 80 and 82) defining a serpentine flow path of increasing cross-sectional area between an inlet (74) and an outlet (76) which is self-cleaning and effects noise reduction without absorptive material that would otherwise quickly clog the silencer.
Abstract A silencer (70) which is particularly adapted for use with a pneumatic grain conveyor (10) includes a housing (72) with an arrangement of internal baffles (78, 80 and 82) defining a serpentine flow path of increasing cross-sectional area between an inlet (74) and an outlet (76) which is self-cleaning and effects noise reduction without absorptive material that would otherwise quickly clog the silencer.
Description
~ 3 ~
SIL~NCER FOR PNEUMATIC GRAIN CONVEYOR
Technical Field The pxesent invention relates generally to pneumatic grain conveyors, and more particularly to an air silencer adapted for connection between the blower and the rotary valve at the base of a cyclone separator in a pneumatic material handling device for noise reduction without undue suseptability to clogging.
Backqround Art Pneumatic conveyors are widely used today for trans-ferring qrain and other types of granular material. For example, such devices can be used for tranferring grain from a storage silo to a delivery truck, a laborious and time-consuming task which was otherwise accomplished by shoveling. Such pneumatic conveyors generally include a cyclone separator having a tangen-tial material inlet and a bottom axial material outlet. The suc-tion side of a blower is connected to an axial air outlet in the top of the separator. The high pressure side of the blower is connected to a rotary valve which is connected between the material outlet of the separator and a hose or line leading to the point of discharge.
Such devices have been mounted for mobility and adapted for use with power take-off attachments on tractors to facilitate portability and use in unloading various silos on a farm, for example. Pneumatic grain conveyors of this general type have been available for years under the name HANDLAIR from Christianson Systems, Inc. of Blomkest, Minnesota, the assignee hereof. See U.S. Pat. Nos. 4,433,946 and De~. 271,105.
However, such pneumatic conveyors have tended to be relatively noisy. The noise is primarily due to the flow of high pressure air from the discharge side of the positive displacement air pump or blower, the intake side of which is connected to the cvclone separator, and thus tends to receive alr dirty and laden :
: ~:
:: :
:
.
:: :
~ .
.
with dust and other foreign particles which are too large for centrifugal separation with the grain or other granular material being handled. Discharge silencers for rotary blowers have been available heretofore, however, the silencers of the prior art have used chambering and/or absorptive materials which tend to become clogged, particularly when used with dirty air. As a result, the silencers of the prior art quickly become inefective, and thus are not suitable for use with pneumatic grain conveyors. Heretofore, there has not been available a silencer for pneumatic grain conveyors which is self-cleaning and ef~ects noise reduction without the need for absorptive material that would otherwise become clogged and require cleaning and/or replacement and thus interruption in operation, down time, and expense.
A need has thus arisen for a self-cleaning silencer which is particularly adapted for use with a pneumatic grain conveyor.
?
, , : . .
~.
, ~ - ' :.
~
13~6~
Summary of the Invention The present invention comprises a silencer for a pneumatlc grain conveyor that overcomes the foregoing and other difficulties associated with the prior art. In accordance with the invention, there is provided a pneumatic yrain conveyor comprising: a frame; a cyclone separator mounted on said frame, said separator including a closed housing with a top end wall having an air outlet therein, a generally cylindrical upper side wall having a tangential material inlet therein, and a generally conical truncated lower side wall having a material outlet at the bottom end thereof; a rotary valve including a material inlet connected to the material outlet of said cyclone separator, a material outlet, and an air inlet; a blower including an air outlet connected to the air outlet of said cyclone separator, and ; an air outlet; a silencer including an air inlet connected to the air outlet of said blower, and an air outlet connected to the air inlet of said Fotary valve; and means for driving said blower means.
In a further aspect, the invention resides in a pneumatic grain conveyor comprislng: a frame; a cyclone separator mounted on said frame, said separator including a closed housing ~with a top end wall having an air outlet therein, a yenerally cyllndrical upper side wall haviny a tangential material inlet therein, and a generally conical truncated lower side wall having a material outlet at the bottom end thereof; a rotary valve including a material inlet conneated to the material outlet of ~:~ said cyclone separatorj a material outlet, and an air inlet; a :: ~ ~ : :
:~: W
-:
,, : -.
-131~91 3a 62396-873 blower including an air inlet connected to the air outlet of said cyclone separator, and an air outlet; a silencer having a generally cylindrical housing with opposite closed ends interconnected by a surrounding side wall, an air inlet located in one of said ends and connected to the air outlet of said cyclone separator, and an air outlet located in the side wall thereof and connected to the air inlet of said rotary valve, a baffle arrangement disposed within said housing and including a plurality of concentric generally cylindrical baffle members, alternate ones of which are secured to opposite ends of said housing and which terminate short of the other end thereof, said baffle arrangement defining an open serpentine flow path of increasing cross-sectional area between the inlet and outlet of said silencer thereby muffling noi.se and providing for self-cleaning; means for driving said blower means.
., , ~ 3 ~
Brief Description of Drawings A better understanding of the invention can be had by reference to the followinq Detailed Description in conjuction with the accompanying Drawings, wherein: .
Fig. 1 is a perspective view of a pneumatic grain conveyor incorporating the self-cleaning silencer of the invention; and Fig. ~ is an enlarged cross-sectional view of a silencer incorporating the first embodiment.
~:, , ' ~,~
~: .
: :
, ~: : , : , ~ ' ., ~ :
~3~ ~6~
Detailed Description Referring now to the Drawings, wherein like reference numerals designate like or corresponding elements throughout the views, and particularly referring to Fig. 1, there is shown a pneumatic grain conveyor 10 incorporatiny the self-cleaning air silencer of the present invention. The pneumatic grain conveyor 10 includes a frame 12 having a pair of spaced-apart wheels 14 thereon for mobility. A tongue 16 is provided on the front of frame 12, and a hitch 18 is provided on the front of the tongue for selective connection to a tractor or other suitable tow vehicle. The longitudinal tongue 16 is preferably offset from the center line of frame 12 for improved clearance when loading trucks or trailers.
A cyclone separator 20 is mounted on frame 12. The separator 20 includes a housing having a generally cylindrical upper side wall and a generally conical truncated lower side wall as shown. Air axial air outlet 21 is located in the top end of separator housing. A tangential grain or material inlet 22 is provided in the generally cylindrical upper wall of the housing of separator 20. A pipe or hose 24, which can be either rigid, semi rigid or flexible, is connected to the material inlet 22 and extends to a nozzle 25 for picking up the material to be conveyed. For example, the hose 24 would typically extend into a bin or silo for removing grain or the like therefrom.
A rotary air lock conveying valve 26 of the flow-through type is secured to the material outlet 28 in the bottom end of the housing of separator 20. The valve 26 includes a material inlet~coupled directly to the material outlet 28 of separator 20, a material outlet 30, and an air inlet 32. The valve 26 is .
typically hydraulically driven. A suitable valve is commercially available from Se~co. The material outlet 30 is connected to a discharge pipe 34 which extends upwardly and is supported by an : ~ , :
, ; : ' .
: . .
_ 6 - 1 3 1 1 6 9 ~
upright 36 on the rear corner of frame 12. A discharge cyclone 38 ls provided on the end of pipe 34 for breaklng the air lock and assuring that the grain or other materlal falls gently lnto an underlying traller or truck (not shown).
The dlscharge plpe 34 ls preferably of spllt construc-tion to reduce clearance durlng transport of the pneumatic graln conveyor 10 between sltes. In partlcular, the dlscharge plpe 34 includes a plvotal upper portlon and a fl~ed lower portlon lnterconnected by a coupllng 40 like that shown in U.S. Pat. No.
4,433,946. The upper portlon of dlscharge pipe 34 folds between ralsed and lowered positions responslve to a crank or hydraullc cyllnder arrangement.
The alr lnlet 32 of rotary valve 26 ls connected by plpe 50 to the outlet of a blower 52, which ls drlven through a gear box 54 by a shaft 56 connected to the power takeoff (PT0) attach-ment of a tractor (not shown). For example, the RCS 409 or RCS
412 blower from Roots dlvislon of Dresser Industries, Inc. can be used for the blower 52, which typlcally operates at about 700-1600 CFM and 5-8 psi. The inlet of blower 52 is connected by pipe 58 to a fllter assembly 60 mounted axially ln the alr outlet 21 in the top end of separator 20.
The blower 52 ls a positive dlsplacement air pump which draws air from the separator 20 ln order to lower the pressure thereln, and thus effect suction on the hose 24 so that the graln or other materlal to be conveyed ls drawn inwardly through the tangential lnlet 22 thus creatlng a vortex wlthln the separator.
The resultlng centrlfugal force causes the grain to move outwardly within the separator 20 as it swlrls downwardly by gravity through :
-- 6a _ 1311691L
the materlal outlet 28 and into valve 26, from which it ls forced by the pressurize~ air from blower 52 outwardly through the dlscharge plpe 34. The swirllng actlon . ~ :
, ::
:
.
,:
, .... ..
: ~ ~: - , , ~ 3 ~
within separator 20 results in separation of chaff, dust and other foreign material from the grain which is entrained in the air and carried through the filter assembly 60 and pipe 58 to blower 52 for pressurization. Although filter assembly 60 is used, it will be appreciated that air containing a fair amount of dust and foreign material enters the blower 52.
Referring now to Fig. 2 in conjunction with Fig. 1, there is shown the self-cleaning air silencer 70 which is particularly adapted for connection between the valve 26 and blower 52 for noise reduction without clogging. The silencer 70 includes a housing 72 having a spaced-apart inlet 74 and outlet 76. As illustrated, the inlet 74 is axially positioned in the lower end of housing 72, while the outlet 76 is radially positioned in the side of the housing. A series of baffles 78, 80 and 82 are alternately connected to opposite ends of the housing 72. In particular, the inner baffle 78 is secured at one end to the lower end of the housing 72 about the inlet 74, with its opposite end terminating in axially spaced-apart relationship with the top end of the housing. T~e intermediate baffle 80 is secured to the top end of housing 72 in spaced-apart, surrounding relationship with the free end of the inner baffle 78, with its opposite end terminating in axially spaced-apart relationship with the bottom end ~f the housing as shown. ~he outer baffle 82 is secured similarly to the inner baffle 78, but in surrounding relationship with the intermediate baf1e 80. Although three baffles have been shown, any suitable number can be used.
Baffles 78, 80 and 82 are thus concentric and are preferably of generally cylindrical shape, although baffles of rectangular or other suitable cross-sectional shape could also be used. The spacing between the baffles and housing depends upon the degree of noise reduction desired versus the amount of pressure lost which is acceptable. It will be noted that no ' , ~, . .
.
:
1 3 ~
absorptive material is utilized. This comprises a significant feature of the present invention. Further, it will be appreciated that the baffles 78, 80 and 82 define a serpentine flow path of increasing cross-sectional flow area between the inlet 7~ and outlet 76 of silencer 70. This results in a silencer 70 which avoids chambering and absorptive materials that would otherwise quickly result in clogging, while achieving substantial noise reduction in a manner which is uniquely suitable for use with pneumatic grain conveyors.
Although self-cleaning air silencer 70 is illustrated as connected to the outlet or high pressure side of blower 52, it will be appreciated that it could be connected to the inlet or suction side of the blower. Further, the silencer 7~ could be utilized with equipment other than pneumatic conveyors, wherein noise reduction under conditions of dirty air flow with little or no clogging are desired.
A fitting 8~ for a pressure relief valve ~not shown) is provided on the top end of silencer 70.
~ silencer constructed in accordance with the invention has been found to provide about 25-30 dba noise reduction at about 1,000 cfm and 1-5 psi.
From the foregoing, it will thus be apparent that the present invention comprises a pneumatic grain conveyor having an improved air silencer which is self-cleaning and reduces noise while functioning with dirty air without clogging. Other advantages will be evident to those skilled in the art.
Although particular embodiments of the invention have been illustrated in the accompanying Drawings and described in the foregoing Detailed Description, it will be understood that the invention is not limited only to the embodiments disclosed, but is intended to embrace any alternatives, equivalents, modifi-cations and/or rearrangements of elements falling within the scope of the invention as defined by the following Claims.
~ ,A.
: ~ .
.
SIL~NCER FOR PNEUMATIC GRAIN CONVEYOR
Technical Field The pxesent invention relates generally to pneumatic grain conveyors, and more particularly to an air silencer adapted for connection between the blower and the rotary valve at the base of a cyclone separator in a pneumatic material handling device for noise reduction without undue suseptability to clogging.
Backqround Art Pneumatic conveyors are widely used today for trans-ferring qrain and other types of granular material. For example, such devices can be used for tranferring grain from a storage silo to a delivery truck, a laborious and time-consuming task which was otherwise accomplished by shoveling. Such pneumatic conveyors generally include a cyclone separator having a tangen-tial material inlet and a bottom axial material outlet. The suc-tion side of a blower is connected to an axial air outlet in the top of the separator. The high pressure side of the blower is connected to a rotary valve which is connected between the material outlet of the separator and a hose or line leading to the point of discharge.
Such devices have been mounted for mobility and adapted for use with power take-off attachments on tractors to facilitate portability and use in unloading various silos on a farm, for example. Pneumatic grain conveyors of this general type have been available for years under the name HANDLAIR from Christianson Systems, Inc. of Blomkest, Minnesota, the assignee hereof. See U.S. Pat. Nos. 4,433,946 and De~. 271,105.
However, such pneumatic conveyors have tended to be relatively noisy. The noise is primarily due to the flow of high pressure air from the discharge side of the positive displacement air pump or blower, the intake side of which is connected to the cvclone separator, and thus tends to receive alr dirty and laden :
: ~:
:: :
:
.
:: :
~ .
.
with dust and other foreign particles which are too large for centrifugal separation with the grain or other granular material being handled. Discharge silencers for rotary blowers have been available heretofore, however, the silencers of the prior art have used chambering and/or absorptive materials which tend to become clogged, particularly when used with dirty air. As a result, the silencers of the prior art quickly become inefective, and thus are not suitable for use with pneumatic grain conveyors. Heretofore, there has not been available a silencer for pneumatic grain conveyors which is self-cleaning and ef~ects noise reduction without the need for absorptive material that would otherwise become clogged and require cleaning and/or replacement and thus interruption in operation, down time, and expense.
A need has thus arisen for a self-cleaning silencer which is particularly adapted for use with a pneumatic grain conveyor.
?
, , : . .
~.
, ~ - ' :.
~
13~6~
Summary of the Invention The present invention comprises a silencer for a pneumatlc grain conveyor that overcomes the foregoing and other difficulties associated with the prior art. In accordance with the invention, there is provided a pneumatic yrain conveyor comprising: a frame; a cyclone separator mounted on said frame, said separator including a closed housing with a top end wall having an air outlet therein, a generally cylindrical upper side wall having a tangential material inlet therein, and a generally conical truncated lower side wall having a material outlet at the bottom end thereof; a rotary valve including a material inlet connected to the material outlet of said cyclone separator, a material outlet, and an air inlet; a blower including an air outlet connected to the air outlet of said cyclone separator, and ; an air outlet; a silencer including an air inlet connected to the air outlet of said blower, and an air outlet connected to the air inlet of said Fotary valve; and means for driving said blower means.
In a further aspect, the invention resides in a pneumatic grain conveyor comprislng: a frame; a cyclone separator mounted on said frame, said separator including a closed housing ~with a top end wall having an air outlet therein, a yenerally cyllndrical upper side wall haviny a tangential material inlet therein, and a generally conical truncated lower side wall having a material outlet at the bottom end thereof; a rotary valve including a material inlet conneated to the material outlet of ~:~ said cyclone separatorj a material outlet, and an air inlet; a :: ~ ~ : :
:~: W
-:
,, : -.
-131~91 3a 62396-873 blower including an air inlet connected to the air outlet of said cyclone separator, and an air outlet; a silencer having a generally cylindrical housing with opposite closed ends interconnected by a surrounding side wall, an air inlet located in one of said ends and connected to the air outlet of said cyclone separator, and an air outlet located in the side wall thereof and connected to the air inlet of said rotary valve, a baffle arrangement disposed within said housing and including a plurality of concentric generally cylindrical baffle members, alternate ones of which are secured to opposite ends of said housing and which terminate short of the other end thereof, said baffle arrangement defining an open serpentine flow path of increasing cross-sectional area between the inlet and outlet of said silencer thereby muffling noi.se and providing for self-cleaning; means for driving said blower means.
., , ~ 3 ~
Brief Description of Drawings A better understanding of the invention can be had by reference to the followinq Detailed Description in conjuction with the accompanying Drawings, wherein: .
Fig. 1 is a perspective view of a pneumatic grain conveyor incorporating the self-cleaning silencer of the invention; and Fig. ~ is an enlarged cross-sectional view of a silencer incorporating the first embodiment.
~:, , ' ~,~
~: .
: :
, ~: : , : , ~ ' ., ~ :
~3~ ~6~
Detailed Description Referring now to the Drawings, wherein like reference numerals designate like or corresponding elements throughout the views, and particularly referring to Fig. 1, there is shown a pneumatic grain conveyor 10 incorporatiny the self-cleaning air silencer of the present invention. The pneumatic grain conveyor 10 includes a frame 12 having a pair of spaced-apart wheels 14 thereon for mobility. A tongue 16 is provided on the front of frame 12, and a hitch 18 is provided on the front of the tongue for selective connection to a tractor or other suitable tow vehicle. The longitudinal tongue 16 is preferably offset from the center line of frame 12 for improved clearance when loading trucks or trailers.
A cyclone separator 20 is mounted on frame 12. The separator 20 includes a housing having a generally cylindrical upper side wall and a generally conical truncated lower side wall as shown. Air axial air outlet 21 is located in the top end of separator housing. A tangential grain or material inlet 22 is provided in the generally cylindrical upper wall of the housing of separator 20. A pipe or hose 24, which can be either rigid, semi rigid or flexible, is connected to the material inlet 22 and extends to a nozzle 25 for picking up the material to be conveyed. For example, the hose 24 would typically extend into a bin or silo for removing grain or the like therefrom.
A rotary air lock conveying valve 26 of the flow-through type is secured to the material outlet 28 in the bottom end of the housing of separator 20. The valve 26 includes a material inlet~coupled directly to the material outlet 28 of separator 20, a material outlet 30, and an air inlet 32. The valve 26 is .
typically hydraulically driven. A suitable valve is commercially available from Se~co. The material outlet 30 is connected to a discharge pipe 34 which extends upwardly and is supported by an : ~ , :
, ; : ' .
: . .
_ 6 - 1 3 1 1 6 9 ~
upright 36 on the rear corner of frame 12. A discharge cyclone 38 ls provided on the end of pipe 34 for breaklng the air lock and assuring that the grain or other materlal falls gently lnto an underlying traller or truck (not shown).
The dlscharge plpe 34 ls preferably of spllt construc-tion to reduce clearance durlng transport of the pneumatic graln conveyor 10 between sltes. In partlcular, the dlscharge plpe 34 includes a plvotal upper portlon and a fl~ed lower portlon lnterconnected by a coupllng 40 like that shown in U.S. Pat. No.
4,433,946. The upper portlon of dlscharge pipe 34 folds between ralsed and lowered positions responslve to a crank or hydraullc cyllnder arrangement.
The alr lnlet 32 of rotary valve 26 ls connected by plpe 50 to the outlet of a blower 52, which ls drlven through a gear box 54 by a shaft 56 connected to the power takeoff (PT0) attach-ment of a tractor (not shown). For example, the RCS 409 or RCS
412 blower from Roots dlvislon of Dresser Industries, Inc. can be used for the blower 52, which typlcally operates at about 700-1600 CFM and 5-8 psi. The inlet of blower 52 is connected by pipe 58 to a fllter assembly 60 mounted axially ln the alr outlet 21 in the top end of separator 20.
The blower 52 ls a positive dlsplacement air pump which draws air from the separator 20 ln order to lower the pressure thereln, and thus effect suction on the hose 24 so that the graln or other materlal to be conveyed ls drawn inwardly through the tangential lnlet 22 thus creatlng a vortex wlthln the separator.
The resultlng centrlfugal force causes the grain to move outwardly within the separator 20 as it swlrls downwardly by gravity through :
-- 6a _ 1311691L
the materlal outlet 28 and into valve 26, from which it ls forced by the pressurize~ air from blower 52 outwardly through the dlscharge plpe 34. The swirllng actlon . ~ :
, ::
:
.
,:
, .... ..
: ~ ~: - , , ~ 3 ~
within separator 20 results in separation of chaff, dust and other foreign material from the grain which is entrained in the air and carried through the filter assembly 60 and pipe 58 to blower 52 for pressurization. Although filter assembly 60 is used, it will be appreciated that air containing a fair amount of dust and foreign material enters the blower 52.
Referring now to Fig. 2 in conjunction with Fig. 1, there is shown the self-cleaning air silencer 70 which is particularly adapted for connection between the valve 26 and blower 52 for noise reduction without clogging. The silencer 70 includes a housing 72 having a spaced-apart inlet 74 and outlet 76. As illustrated, the inlet 74 is axially positioned in the lower end of housing 72, while the outlet 76 is radially positioned in the side of the housing. A series of baffles 78, 80 and 82 are alternately connected to opposite ends of the housing 72. In particular, the inner baffle 78 is secured at one end to the lower end of the housing 72 about the inlet 74, with its opposite end terminating in axially spaced-apart relationship with the top end of the housing. T~e intermediate baffle 80 is secured to the top end of housing 72 in spaced-apart, surrounding relationship with the free end of the inner baffle 78, with its opposite end terminating in axially spaced-apart relationship with the bottom end ~f the housing as shown. ~he outer baffle 82 is secured similarly to the inner baffle 78, but in surrounding relationship with the intermediate baf1e 80. Although three baffles have been shown, any suitable number can be used.
Baffles 78, 80 and 82 are thus concentric and are preferably of generally cylindrical shape, although baffles of rectangular or other suitable cross-sectional shape could also be used. The spacing between the baffles and housing depends upon the degree of noise reduction desired versus the amount of pressure lost which is acceptable. It will be noted that no ' , ~, . .
.
:
1 3 ~
absorptive material is utilized. This comprises a significant feature of the present invention. Further, it will be appreciated that the baffles 78, 80 and 82 define a serpentine flow path of increasing cross-sectional flow area between the inlet 7~ and outlet 76 of silencer 70. This results in a silencer 70 which avoids chambering and absorptive materials that would otherwise quickly result in clogging, while achieving substantial noise reduction in a manner which is uniquely suitable for use with pneumatic grain conveyors.
Although self-cleaning air silencer 70 is illustrated as connected to the outlet or high pressure side of blower 52, it will be appreciated that it could be connected to the inlet or suction side of the blower. Further, the silencer 7~ could be utilized with equipment other than pneumatic conveyors, wherein noise reduction under conditions of dirty air flow with little or no clogging are desired.
A fitting 8~ for a pressure relief valve ~not shown) is provided on the top end of silencer 70.
~ silencer constructed in accordance with the invention has been found to provide about 25-30 dba noise reduction at about 1,000 cfm and 1-5 psi.
From the foregoing, it will thus be apparent that the present invention comprises a pneumatic grain conveyor having an improved air silencer which is self-cleaning and reduces noise while functioning with dirty air without clogging. Other advantages will be evident to those skilled in the art.
Although particular embodiments of the invention have been illustrated in the accompanying Drawings and described in the foregoing Detailed Description, it will be understood that the invention is not limited only to the embodiments disclosed, but is intended to embrace any alternatives, equivalents, modifi-cations and/or rearrangements of elements falling within the scope of the invention as defined by the following Claims.
~ ,A.
: ~ .
.
Claims (4)
1. A pneumatic grain conveyor comprising:
a frame;
a cyclone separator mounted on said frame, said separator including a closed housing with a top end wall having an air outlet therein, a generally cylindrical upper side wall having a tangential material inlet therein, and a generally conical truncated lower side wall having a material outlet at the bottom end thereof;
a rotary valve including a material inlet connected to the material outlet of said cyclone separator, a material outlet, and an air inlet;
a blower including an air outlet connected to the air outlet of said cyclone separator, and an air outlet;
a silencer including an air inlet connected to the air outlet of said blower, and an air outlet connected to the air inlet of said rotary valve; and means for driving said blower means.
a frame;
a cyclone separator mounted on said frame, said separator including a closed housing with a top end wall having an air outlet therein, a generally cylindrical upper side wall having a tangential material inlet therein, and a generally conical truncated lower side wall having a material outlet at the bottom end thereof;
a rotary valve including a material inlet connected to the material outlet of said cyclone separator, a material outlet, and an air inlet;
a blower including an air outlet connected to the air outlet of said cyclone separator, and an air outlet;
a silencer including an air inlet connected to the air outlet of said blower, and an air outlet connected to the air inlet of said rotary valve; and means for driving said blower means.
2. A pneumatic grain conveyor in accordance with claim 1 wherein said conveyor is transportable further comprising:
a pair of wheels mounted in laterally spaced apart relationship on said frame for transportability;
a hitch for selectively connecting said frame to a tow vehicle.
a pair of wheels mounted in laterally spaced apart relationship on said frame for transportability;
a hitch for selectively connecting said frame to a tow vehicle.
3. A pneumatic grain conveyor comprising:
a frame;
a cyclone separator mounted on said frame, said separator including a closed housing with a top end wall having an air outlet therein, a generally cylindrical upper side wall having a tangential material inlet therein, and a generally conical truncated lower side wall having a material outlet at the bottom end thereof;
a rotary valve including a material inlet connected to the material outlet of said cyclone separator, a material outlet, and an air inlet;
a blower including an air inlet connected to the air outlet of said cyclone separator, and an air outlet;
a silencer having a generally cylindrical housing with opposite closed ends interconnected by a surrounding side wall, an air inlet located in one of said ends and connected to the air outlet of said cyclone separator, and an air outlet located in the side wall thereof and connected to the air inlet of said rotary valve, a baffle arrangement disposed within said housing and including a plurality of concentric generally cylindrical baffle members, alternate ones of which are secured to opposite ends of said housing and which terminate short of the other end thereof, said baffle arrangement defining an open serpentine flow path of increasing cross-sectional area between the inlet and outlet of said silencer thereby muffling noise and providing for self-cleaning;
means for driving said blower means.
a frame;
a cyclone separator mounted on said frame, said separator including a closed housing with a top end wall having an air outlet therein, a generally cylindrical upper side wall having a tangential material inlet therein, and a generally conical truncated lower side wall having a material outlet at the bottom end thereof;
a rotary valve including a material inlet connected to the material outlet of said cyclone separator, a material outlet, and an air inlet;
a blower including an air inlet connected to the air outlet of said cyclone separator, and an air outlet;
a silencer having a generally cylindrical housing with opposite closed ends interconnected by a surrounding side wall, an air inlet located in one of said ends and connected to the air outlet of said cyclone separator, and an air outlet located in the side wall thereof and connected to the air inlet of said rotary valve, a baffle arrangement disposed within said housing and including a plurality of concentric generally cylindrical baffle members, alternate ones of which are secured to opposite ends of said housing and which terminate short of the other end thereof, said baffle arrangement defining an open serpentine flow path of increasing cross-sectional area between the inlet and outlet of said silencer thereby muffling noise and providing for self-cleaning;
means for driving said blower means.
4. A pneumatic grain conveyor in accordance with claim 3 further comprising a filter mounted in the air outlet of said cyclone separator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/085,395 US4913597A (en) | 1987-08-12 | 1987-08-12 | Silencer for pneumatic grain conveyor |
| US085,395 | 1987-08-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1311691C true CA1311691C (en) | 1992-12-22 |
Family
ID=22191341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000574278A Expired - Lifetime CA1311691C (en) | 1987-08-12 | 1988-08-10 | Silencer for pneumatic grain conveyor |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4913597A (en) |
| CA (1) | CA1311691C (en) |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5163786A (en) * | 1987-08-12 | 1992-11-17 | Christianson Systems, Inc. | Cyclone separator with filter assembly for pneumatic conveyor |
| US5125771A (en) * | 1990-04-25 | 1992-06-30 | Blowhard Pneumatic Services, Inc. | Apparatus for introducing bulk materials into pneumatic conveying line |
| US5120165A (en) * | 1990-05-03 | 1992-06-09 | Walko Jr John F | Excavation system with pneumatic conveyance and separation of excavated material |
| US5374141A (en) * | 1991-09-11 | 1994-12-20 | Board Of Control Of Michigan Technological University | Mat forming apparatus |
| US5322098A (en) * | 1992-03-13 | 1994-06-21 | Christianson Systems, Inc. | Apparatus and method for conveyance of flowable solid materials |
| EP0574596A1 (en) * | 1992-06-13 | 1993-12-22 | Ibau Hamburg Ingenieurgesellschaft Industriebau Mbh | Device utilising gas suction and pressure for transporting dustlike goods, especially cement |
| US5521339A (en) * | 1994-11-18 | 1996-05-28 | Wci Outdoor Products, Inc. | Catalyst muffler system |
| US6142714A (en) * | 1998-06-15 | 2000-11-07 | Montag; Roger A. | Particulate material accelerator conveyor |
| JP2000337255A (en) | 1999-05-26 | 2000-12-05 | Toyota Autom Loom Works Ltd | Damping device and suction structure of compressor |
| US6921037B2 (en) * | 2003-04-17 | 2005-07-26 | Finn Corporation | Adjustable discharge apparatus |
| US7278804B2 (en) * | 2005-10-07 | 2007-10-09 | Hi-Plains Trading Company | Methods and systems for delivering lost circulation material into drilling pits |
| US7600607B2 (en) * | 2005-11-17 | 2009-10-13 | John Timothy Sullivan | Flow-through sound-cancelling mufflers |
| US20070292218A1 (en) * | 2006-06-15 | 2007-12-20 | Robert John Suchey | Dynamic blower system, and methods of constructing and utilizing same |
| CN101676563B (en) * | 2008-09-20 | 2011-07-20 | 比亚迪股份有限公司 | Vacuum pump |
| FI122333B (en) * | 2010-06-03 | 2011-12-15 | Maricap Oy | Method in Material Transfer System, Material Transfer System and Material Supply System Vacuum Source |
| US8684636B2 (en) * | 2011-03-09 | 2014-04-01 | James Dunstan | Air seeder venting system |
| US8978819B2 (en) * | 2013-06-07 | 2015-03-17 | Yamaha Hatsudoki Kabushiki Kaisha | Spark arrestor, muffler, and straddle type vehicle |
| CA2932815A1 (en) * | 2016-06-14 | 2017-12-14 | Brandt Agricultural Products Ltd. | Vacuum conveyor with cogged drive belt |
| CA2932814A1 (en) | 2016-06-14 | 2017-12-14 | Brandt Agricultural Products Ltd. | Vacuum conveyor with intake nozzle and sleeve |
| FI20185883A (en) * | 2018-10-22 | 2020-04-23 | Maricap Oy | Method for handling material in a material transport system, separator arrangement and material transport system |
| US11859523B2 (en) * | 2022-01-06 | 2024-01-02 | Honeywell International Inc. | Muffler |
Family Cites Families (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US750011A (en) * | 1904-01-19 | willis | ||
| US582485A (en) * | 1897-05-11 | reeves | ||
| US692094A (en) * | 1901-09-07 | 1902-01-28 | Christian F Weeber | Muffler for explosive-engines. |
| US792804A (en) * | 1904-10-31 | 1905-06-20 | Daniel G Williams | Muffler for gas-engines. |
| US890686A (en) * | 1907-12-14 | 1908-06-16 | William L Myers | Gun-wad. |
| US990686A (en) * | 1911-02-02 | 1911-04-25 | Ernst Troike | Engine-muffler. |
| US1149699A (en) * | 1911-09-22 | 1915-08-10 | Fred W Sperry | Muffler. |
| US1115873A (en) * | 1912-08-12 | 1914-11-03 | Organ Power Company | Organ-blower. |
| US1490957A (en) * | 1920-07-08 | 1924-04-22 | Richard Ernst | Method and device for muffling the noise of the exhaust gases of internal-combustion engines |
| US1468398A (en) * | 1921-05-06 | 1923-09-18 | Reed John | Intake silencer for internal-combustion engines |
| US1598578A (en) * | 1921-11-21 | 1926-08-31 | Maxim Silencer Co | Silencer |
| US1804875A (en) * | 1926-02-02 | 1931-05-12 | Cons Car Heating Co Inc | Bus heating system |
| US2142268A (en) * | 1938-03-22 | 1939-01-03 | Jr George W Gibbs | Marine engine exhaust |
| US2643730A (en) * | 1951-11-23 | 1953-06-30 | Beattie Arthur | Retroverted passage type exhaust silencer |
| US2806548A (en) * | 1953-08-11 | 1957-09-17 | Fred H Carroll | Exhaust muffler |
| US2995200A (en) * | 1959-10-23 | 1961-08-08 | Seifert Vernon | Exhaust muffler for engines |
| DE1476539A1 (en) * | 1963-01-21 | 1969-07-10 | Junkers & Co | Silencer, especially for a burner system with pulsating combustion |
| CH480703A (en) * | 1968-02-17 | 1969-10-31 | Aug Laukhuff Fa | Wind generators, in particular for musical instruments |
| US3612216A (en) * | 1969-12-01 | 1971-10-12 | Gen Impact Extrusions Mfg Ltd | Muffler can |
| GB1548381A (en) * | 1975-06-26 | 1979-07-11 | Clayson Nv | Harvesting machines |
| US4016994A (en) * | 1975-09-16 | 1977-04-12 | Wurster Wilfred A | Mobile vacuum and pneumatic unit |
| USD271105S (en) * | 1981-07-21 | 1983-10-25 | Christianson Systems, Inc. | Bulk material handling apparatus |
| US4433946A (en) * | 1981-07-21 | 1984-02-28 | Christianson Systems, Inc. | Discharge system for grain handling apparatus |
| US4394259A (en) * | 1981-10-27 | 1983-07-19 | Temco, Inc. | Vacuum pneumatic conveying apparatus and method for transferring food products |
| US4450932A (en) * | 1982-06-14 | 1984-05-29 | Nelson Industries, Inc. | Heat recovery muffler |
| US4572726A (en) * | 1983-07-25 | 1986-02-25 | Vana Industries Ltd. | Cyclone separator |
| US4580928A (en) * | 1984-01-18 | 1986-04-08 | Vana Industries Ltd. | Outlet duct for a pneumatic conveyor |
| US4718924A (en) * | 1986-05-30 | 1988-01-12 | Demarco Thomas M | Two compartment four stage industrial dust collector |
-
1987
- 1987-08-12 US US07/085,395 patent/US4913597A/en not_active Expired - Fee Related
-
1988
- 1988-08-10 CA CA000574278A patent/CA1311691C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US4913597A (en) | 1990-04-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1311691C (en) | Silencer for pneumatic grain conveyor | |
| US5163786A (en) | Cyclone separator with filter assembly for pneumatic conveyor | |
| US4599016A (en) | Cyclone apparatus for pneumatically moving granular matter | |
| US4016994A (en) | Mobile vacuum and pneumatic unit | |
| US4885012A (en) | Rotary screen for pneumatic grain handling | |
| US11167930B1 (en) | Auger conveyor for removing unwanted contaminants from a granular material | |
| US5035543A (en) | Material transfer apparatus | |
| US4344723A (en) | Vacuum grain moving apparatus | |
| US4662800A (en) | Grain and fertilizer collector | |
| US7959697B2 (en) | Auger screen | |
| US20060191098A1 (en) | Suction nozzle | |
| US9205999B2 (en) | Exhaust dust collector for a particulate loader | |
| US4887936A (en) | Cyclone separator with accelerator plate for pneumatic conveyor | |
| CA2498435A1 (en) | Suction nozzle | |
| US10017332B2 (en) | Vacuum conveyor with intake nozzle and sleeve | |
| KR100289803B1 (en) | Compressed load and unload vehicle using vaccume | |
| US4846605A (en) | Pneumatic grain conveyor with universal frame | |
| US6579041B2 (en) | Pre-screening element for pneumatic particle transport systems | |
| US6247876B1 (en) | Portable, gas-powered, general purposes, pneumatic transport device | |
| KR100891803B1 (en) | An apparatus for preventing dust collecting pipe from clogging | |
| CN87204734U (en) | Pressure absorption type miniature air conveyer for bulk cargo | |
| EP0586752A1 (en) | Vehicle for transporting powder-form, granular and pellet-like material and method for unloading such vehicle | |
| NL8403738A (en) | TANK CART. | |
| RU221701U1 (en) | Screw conveyor - grain cleaner | |
| JPH0518912Y2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |