Responsive To Pressure Or Velocity Change Of Conveying Fluid Patents (Class 406/30)
  • Patent number: 11261040
    Abstract: A conveyor for pulverized material comprises in combination a conduit, a screw rotatably mounted within the conduit having an material inlet end and material discharge end, means for rotating the screw, means for supplying material to the screw at the material inlet end, whereby the material will be compacted as it is advanced by the screw to the material discharge end, and means for admitting a gas under pressure to the compacted material at the material discharge end to render it fluent. In a portion of the screw a material seal is formed by the compacted material being advanced by the screw, wherein there are material pockets formed between adjacent screw flights, wherein the pocket size volume is at its maximum nearest the material inlet end and at its minimum nearest the material outlet end, with at least twice as many pockets of minimum size as of maximum size.
    Type: Grant
    Filed: September 17, 2019
    Date of Patent: March 1, 2022
    Inventor: Andrew Charles Fried
  • Patent number: 9185932
    Abstract: A tobacco dosing system (1) for providing doses of tobacco (4) includes a tobacco supply (3) constructed and arranged to supply tobacco (4), a dosing device (5) including at least one dosing cup (11, 12) for receiving the tobacco (4) to be dosed, a gas flow device (6) constructed and arranged to in use provide a gas flow (10) through the tobacco received by the at least one dosing cup (11, 12), a gas flow measuring (7) device constructed and arranged to measure a property of the gas flow (10), and a controlling device (8) operably connected to the dosing device (5) and the gas flow measuring device (7) to control the operation of the tobacco dosing system (1) on basis of the measured property.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: November 17, 2015
    Assignee: Sluis Cigar Machinery B.V.
    Inventors: Ronald Petrus Gerhardus Dekkers, Mark Leendert Meijer
  • Patent number: 9061842
    Abstract: Method for automatically loading feed line with bulk material in suction delivery system having feed line, loading point, reservoir, and at least one material separator arranged at distance to reservoir. Method includes selecting target value for air speed for area of loading point, wherein for area of loading point, minimum target value and maximum target value for air speed are empirically determined from feed line parameters related to feed line and material parameters related to bulk material and values are stored in database. Method includes measuring in area of loading point one of air speed and quantity serving for determination of air speed in feed line and sending target value and measured value of air speed to controller. Method includes controlling air speed to target value via suction capacity, and adding bulk material in metered manner in dependence upon measured value of air speed when target value is reached.
    Type: Grant
    Filed: August 17, 2010
    Date of Patent: June 23, 2015
    Assignee: WITTMANN KUNSTSTOFFGERAETE GMBH
    Inventor: Andreas Vierling
  • Patent number: 8915679
    Abstract: An ash transport system and method is provided that includes a transport line, four hoppers, and an airlock or hopper valve attached to each hopper. The ash transport system transports an ash mass from the airlock or hopper valve to the transport line if pressure in the transport line falls below a predefined pressure threshold assigned to the respective airlock or hopper valve. After a predefined period of time elapses, the ash transport system transports the ash mass from the airlock or hopper valve to the transport line if the pressure in the transport line falls below different respective predefined pressure thresholds. The airlocks and hopper valves simultaneously transport the ash masses to the transport line if, prior to the predefined period of time elapsing, the pressure in the transport line falls below each of the respective predefined pressure thresholds.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: December 23, 2014
    Assignee: Diamond Power International, Inc.
    Inventors: Henry Walukiewicz, Arun Mehta, Tony F. Habib
  • Patent number: 8875730
    Abstract: A control device is provided with a switching valve mechanism and first and second actuators. The switching valve mechanism is provided with a valve element for switching which is located within a casing. The valve element can linearly move between an open position at which first and second pressure change chambers of the casing are communicated with each other and a closed position at which the communication is interrupted. The valve element is held at the open position and the closed position by a first holding mechanism (toggle spring). When a float ascends to a first water level, the first actuator moves the valve element from the closed position to the open position. When the degree of vacuum within a pressure detection chamber becomes a second degree of vacuum or less, the second actuator moves the valve element from the open position to the closed position.
    Type: Grant
    Filed: March 25, 2010
    Date of Patent: November 4, 2014
    Assignee: Torishima Pump Mfg. Co., Ltd.
    Inventor: Yoshitami Muraki
  • Publication number: 20140199126
    Abstract: An ash transport system and method is provided that includes a transport line, four hoppers, and an airlock or hopper valve attached to each hopper. The ash transport system transports an ash mass from the airlock or hopper valve to the transport line if pressure in the transport line falls below a predefined pressure threshold assigned to the respective airlock or hopper valve. After a predefined period of time elapses, the ash transport system transports the ash mass from the airlock or hopper valve to the transport line if the pressure in the transport line falls below different respective predefined pressure thresholds. The airlocks and hopper valves simultaneously transport the ash masses to the transport line if, prior to the predefined period of time elapsing, the pressure in the transport line falls below each of the respective predefined pressure thresholds.
    Type: Application
    Filed: January 15, 2013
    Publication date: July 17, 2014
    Applicant: Diamond Power International, Inc.
    Inventors: Henry Walukiewicz, Arun Mehta, Tony F. Habib
  • Patent number: 8747029
    Abstract: An air control system for a low pressure continuous dense phase convey system employs a non-critical air flow control system that allows for a supply pressure to be only incrementally larger than a convey pressure. The convey system has an inlet for introduction of pressurized air into the system and an airlock associated with a feedpoint for introduction of particulate into the system. A first pressure sensor is positioned immediately downstream of an air source to measure the supply pressure, and a second pressure transducer is positioned proximate an airlock to measure the convey pressure. The non-critical air flow control system is dependent on the supply and convey pressures and a position of a control valve, such as a sonic nozzle. The difference between the convey pressure and the supply pressure is less than 10% of the supply pressure.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: June 10, 2014
    Assignee: MAC Equipment, Inc.
    Inventor: Jonathan Thorn
  • Patent number: 8491228
    Abstract: An apparatus and a method for controlling the velocity of a particulate material conveyed by a gas flow under negative pressure in a duct said device comprising means for separating the flow into first and second streams. The first stream has a relatively high particulate material content and the second stream has a relatively low particulate material content. The flow of the second stream is restricted for example by a flow restricting or constricting orifice or valve. The duct diameter may increase incrementally along its length.
    Type: Grant
    Filed: November 15, 2006
    Date of Patent: July 23, 2013
    Inventor: Brian Snowdon
  • Publication number: 20110268510
    Abstract: An air control system for a low pressure continuous dense phase convey system employs a non-critical air flow control system that allows for a supply pressure to be only incrementally larger than a convey pressure. The convey system has an inlet for introduction of pressurized air into the system and an airlock associated with a feedpoint for introduction of particulate into the system. A first pressure sensor is positioned immediately downstream of an air source to measure the supply pressure, and a second pressure transducer is positioned proximate an airlock to measure the convey pressure. The non-critical air flow control system is dependent on the supply and convey pressures and a position of a control valve, such as a sonic nozzle. The difference between the convey pressure and the supply pressure is less than 10% of the supply pressure.
    Type: Application
    Filed: May 2, 2011
    Publication date: November 3, 2011
    Applicant: MAC EQUIPMENT, INC.
    Inventor: Jonathan Thorn
  • Patent number: 7740423
    Abstract: A vacuum modulating air control valve includes a valve body with air intake ports, an output port, and a valve throat. A valve member is slidably mounted within the valve body between open positions relative to the valve throat and a closed position, to which the valve member is urged by a valve spring. A pneumatic cylinder has a piston forming a vacuum chamber and has a piston rod connected to the valve member. The output port is connected to a feedpoint of a vacuum conveying system, and the vacuum chamber is connected to a vacuum line communicating with the vacuum conveying system. A vacuum level within the vacuum chamber retracts the valve member from the throat, thereby admitting ambient air into the vacuum conveying system to control a material-to-air ratio within the system.
    Type: Grant
    Filed: July 27, 2007
    Date of Patent: June 22, 2010
    Assignee: MAC Equipment, Inc.
    Inventors: Richard E. Newbolt, Jonathan Thorn
  • Patent number: 7544017
    Abstract: A pneumatic sculpture 10 includes a display tube 30 having a first end 40 and a second end 50. The pneumatic sculpture 10 also includes one or more projectiles 20 contained within the display tube 30. The projectile 20 is capable of being propelled through the display tube 30 from a location proximate to the first end 40 to a location proximate to the second end 50, and thereafter from a location proximate to the second end 50 to a location proximate to the first end 40, thereby traveling in one direction or in both directions. Lastly, the pneumatic sculpture 10 includes a pneumatic means 60 coupled to the first and second ends 40, 50 of the display tube 30 for controlling the speed and direction of the projectile 20 through the display tube 30.
    Type: Grant
    Filed: October 31, 2006
    Date of Patent: June 9, 2009
    Inventor: Charles Wesley Keagy
  • Patent number: 7144203
    Abstract: A method and apparatus for conveying and vacuuming fibrous insulation material. A blower provides an air flow stream through an insulation feeder and a conveying hose for application of the insulation. The air flow stream velocity is selectively controlled responsive to a velocity sensor and/or a pressure sensor between the blower and insulation feeder. Preferably, an air valve connected between the blower outlet and the atmosphere is controlled responsive to the velocity sensor for thereby adjusting and controlling the air flow stream velocity. The insulation feed rate is controlled in response to the air flow pressure between the blower and feeder. An air separator and vacuum hose are selectively connected to the blower inlet such that the blower provides both an air vacuum flow stream through the separator and vacuum hose and a conveying air flow stream through the insulation feeder and conveying hose.
    Type: Grant
    Filed: September 13, 2005
    Date of Patent: December 5, 2006
    Inventor: Milton L. Gerber
  • Patent number: 6964543
    Abstract: A method and apparatus for conveying and vacuuming fibrous insulation material. A blower provides an air flow stream through an insulation feeder and a conveying hose for application of the insulation. The air flow stream velocity is selectively controlled responsive to a velocity sensor and/or a pressure sensor between the blower and insulation feeder. Preferably, an air valve connected between the blower outlet and the atmosphere is controlled responsive to the velocity sensor for thereby adjusting and controlling the air flow stream velocity. The insulation feed rate is controlled in response to the air flow pressure between the blower and feeder. An air separator and vacuum hose are selectively connected to the blower inlet such that the blower provides both an air vacuum flow stream through the separator and vacuum hose and a conveying air flow stream through the insulation feeder and conveying hose.
    Type: Grant
    Filed: October 23, 2003
    Date of Patent: November 15, 2005
    Inventor: Milton L. Gerber
  • Patent number: 6588988
    Abstract: An apparatus for conveying bulk material in which a variable amount of a conveying gas may be introduced to the bulk material to be conveyed by a negative pressure of a vacuum conveying system. In a conveying line (4) for the bulk material being transported by the vacuum conveying system while adding the conveying gas, the negative pressure is measured by a pressure sensor (7), and a corresponding control signal is output. In a conveying gas inlet (3) of the vacuum conveying system, a valve (9) is installed whose opening for the flowing conveying gas is controlled by a controller (8) as a function of the magnitude of the negative pressure within the conveying line (4).
    Type: Grant
    Filed: August 13, 2001
    Date of Patent: July 8, 2003
    Assignee: Mann & Hummel ProTec GmbH
    Inventor: Michael Zlotos
  • Patent number: 6287056
    Abstract: In a method of operating a pulse flow conveying installation (10), which is intended for the conveying of a solid material (33), present in the form of bulk material, by means of a conveying gas, in which pulse flow conveying installation (10) an alternating sequence of solid material pulses (27) and conveying gas pulses (28) is generated by first means (13, . . . , 21) in the conveying conduit (25) and is pressed through the conveying conduit (25), choking is reliably prevented in that the conveying pressure is regulated, and in that to regulate the conveying pressure in the conveying conduit (25), the quantity of the conveying gas flowing on a time average basis through the conveying conduit (25) is altered in relation to the quantity of the solid material conveyed on a time average basis through the conveying conduit (25).
    Type: Grant
    Filed: November 20, 1998
    Date of Patent: September 11, 2001
    Assignee: Gericke AG
    Inventor: Georg Szikszay
  • Patent number: 5538162
    Abstract: A dosing apparatus provides for dosing a particulate phase within a free flowing two phase flow of a gas phase and the particulate phase, wherein the two phase flow leaves a fluidized bed. The apparatus includes, at its bottom, a gas inlet mechanism to supply the gas via an orifice, and an outlet orifice with a discharge pipe. Control of the gas flow to maintain a predetermined level of the bed is attained by weighing the contents of the bed or by use of sensors within a treatment space of the apparatus. Widening mechanism may be located subsequent to the outlet orifice for widening the stream of particulate phase for exposing an enlarged surface area of particles for treatment.
    Type: Grant
    Filed: May 25, 1994
    Date of Patent: July 23, 1996
    Assignee: Buhler AG
    Inventors: Lothar Reh, Marc Tesch, Beat Hani, Arthur Ruf, Thomas Meili, Frank Goedicke
  • Patent number: 5522555
    Abstract: A powder dispersion system, including a powder disperser and a control unit, supplies a controlled particle stream to a particle sizing system, instrument, or other processing device. The powder disperser includes a dynamic shear dispersion assembly and may include a fluidization assembly. An impact surface for deagglomeration of particles is located within a rapid acceleration chamber of the dynamic shear dispersion assembly. The particles are accelerated from the impact surface through an annular nozzle. A feedback loop dynamically controls the dynamic shear force applied to the aerosol transport gas, which in turn places reaction forces upon the particles, within the annular nozzle. The fluidization assembly includes a primary chamber for holding a powder sample and a secondary chamber for entraining particles of the powder sample in a transport gas stream. A pulsed gas jet directed into the primary chamber disperses particles of the powder sample into the secondary chamber.
    Type: Grant
    Filed: March 1, 1994
    Date of Patent: June 4, 1996
    Assignee: Amherst Process Instruments, Inc.
    Inventor: Trent A. Poole
  • Patent number: 5494381
    Abstract: A bulk material conveying system includes a closed chamber having an inlet and an outlet and a conveyor communicating with the chamber outlet for receiving bulk material from the chamber. A pressurized gas is supplied to the upper portion of the chamber and to the conveyor to provide a pressure differential in the chamber which causes the bulk material in the chamber to flow through the outlet and conveyed through the conveyor. A pressure regulator is provided for automatically maintaining the pressure in the upper portion of the chamber at a predetermined value not to exceed a pressure sufficient to maintain the pressure differential during normal material flow rate conditions.
    Type: Grant
    Filed: April 6, 1993
    Date of Patent: February 27, 1996
    Assignee: The Young Industries, Inc.
    Inventors: Robert D. Heyl, John R. Havrilla
  • Patent number: 5480268
    Abstract: A rotary airlock feeder is connected to transfer particulate material between a storage bin and a pneumatic convey line. The pneumatic convey line includes a pressure reducing orifice plate which produces a pressure differential in the convey line between the upstream and downstream sides of the orifice plate. Air from the upstream side flows into respective specially designed end plates of the feeder and the pressure differential between opposite sides of the orifice assures a steady purge air flow circumferentially around a pair of rotary shrouds and into the feeder. This steady air flow prevents particulate material or debris from entering cavities between the shrouds and the end plates and between the rotary shrouds and the housing walls and thus prevents such material from reaching the seals, shaft area, and bearings of the feeder and protects the rotary shrouds from premature abrasive wear.
    Type: Grant
    Filed: May 9, 1995
    Date of Patent: January 2, 1996
    Assignee: Smoot Company
    Inventor: David K. Smoot
  • Patent number: 5469994
    Abstract: Apparatus meters solid present in the gas/solid stream from a fluidized-bed apparatus, in which gas and solid are present as a prehomogenized, free-flowing mixture in a fluidized bed and in which at least one outlet orifice for removal of the gas/solid stream is provided in an outflow pipe. The metering apparatus has a discharge pipe with a gas injection nozzle for establishing a time-constant, emerging mass flow and for establishing the homogeneity of the emerging gas/solid stream. The pipe and nozzle are coordinated with an outlet orifice of the bed apparatus, and/or at least one device for influencing the prehomogenization.
    Type: Grant
    Filed: September 9, 1992
    Date of Patent: November 28, 1995
    Assignee: Buhler AG
    Inventors: Lothar Reh, Marc Tesch, Beat Hani, Arthur Ruf
  • Patent number: 5407305
    Abstract: A continuous dense phase conveying method and apparatus, for conveying large quantities of dry bulk material through a material conveying pipe, feed particulate material into the conveying pipe and supply a quantity of low pressure gas into the pipe to force particulate material to move therealong. A gas pressure within the conveying pipe is monitored. When this monitored pressure reaches a predetermined gas pressure level, a quantity of high pressure gas is supplied to the conveying pipe to force the particulate material to move continuously therealong.
    Type: Grant
    Filed: April 29, 1993
    Date of Patent: April 18, 1995
    Assignee: Semco, Inc.
    Inventor: Edward B. Wallace
  • Patent number: 5354152
    Abstract: In apparatus for conveying batches of ice lumps from a storage hopper to remotely located ice dispensers, ice lumps from the storage hopper are delivered into the main conduits through corresponding main valves and connecting conduits extending between each main valve and the storage hopper. Metering valves meter batches of ice lumps of predetermined size into the main conduits. Conveying air from an air blower is supplied to the main conduits through the main valves for conveying the batches of ice lumps. In use, batches of ice lumps are intermittently delivered into the main conduit, and the batches of ice lumps and conveying air are alternately supplied to the main conduit.
    Type: Grant
    Filed: July 8, 1991
    Date of Patent: October 11, 1994
    Assignee: EOLAS - The Irish Science and Technology Agency
    Inventors: Robert C. Reinhardt, Richard M. Humphreys
  • Patent number: 5145253
    Abstract: An integrated process blending apparatus which blends particulate material and also automatically controls the flow of material into the blender and out to the associated processing equipment. Load cells attached to the blender vessel are used to control the entry of material into the blender, while the pressure drop in the blender output pipe is used to control an output deflector to either remove or recycle material within the blender. The blender is also made more effective by dividing it into vertical compartments with separators which have angled portions preferably in their lower regions to cause different downward flow velocities in each compartment, and by creating a multistage blender by stacking sets of offset compartments one on top of another.
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: September 8, 1992
    Assignee: Fuller Company
    Inventors: Kermit D. Paul, Leslie C. Bartholomew, John S. Szazdi, Jr., Gerald J. Labelle
  • Patent number: 5114280
    Abstract: A vacuum type sewage collecting system, for collecting sewage from a plurality of houses or the like, stores sewage in a sewage reservoir and then delivers the sewage to a sewage treatment station through a vacuum valve and a vacuum sewage pipe. A controller is provided for properly controlling opening/closing operations of the vacuum valve. The controller includes a first vacuum chamber connected to the vacuum sewage pipe via a fluid flow resisting device, a second vacuum chamber likewise connected to the vacuum sewage pipe, an atmospheric pressure introducing unit for introducing an atmospheric pressure into the first vacuum chamber when a detected quantity of sewage stored in the sewage reservoir exceeds a predetermined value, and a shifting unit for selectively introducing negative pressure to the vacuum valve to open or close the latter depending on the present differential pressure between the first vacuum chamber and the second vacuum chamber.
    Type: Grant
    Filed: August 29, 1990
    Date of Patent: May 19, 1992
    Assignee: Ebara Corporation
    Inventors: Akihiro Ushitora, Kazuo Yamaguchi, Tsuneo Asanagi
  • Patent number: 5071289
    Abstract: A system for delivering a particulate material has a closed storage hopper for the material, the hopper having a bottom hopper outlet and a check valve connected to a top portion of the chamber for venting positive pressure from the chamber; a venturi eductor having a material inlet for feeding the material, an eductor outlet, and a gas inlet; a gas feed valve, the gas feed valve being openable in response to a feed signal for activating the eductor; a hopper passage connecting the hopper outlet to the eductor material inlet; a hopper outlet valve for closing the hopper outlet in response to a hopper signal; a stir valve for pressurizing the hopper passage in response to a stir signal for agitating the material in the hopper; and a pressure sensor for momentarily activating the stir signal in response to an absence of the material at the material inlet, the system being operative in a transporting mode wherein the hopper valve is open, the feed valve is open, and the stir valve is closed; a stirring mode wher
    Type: Grant
    Filed: December 27, 1989
    Date of Patent: December 10, 1991
    Assignee: Alpheus Cleaning Technologies Corp.
    Inventor: Philip Spivak
  • Patent number: 5009551
    Abstract: A system for handling particulate material includes a rotary valve for feeding material from a holding device to a receiving device. The rotary valve includes a slide valve that is electrically controlled in response to sensed conditions in the handling system.
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: April 23, 1991
    Assignee: Delaware Investments Corp.
    Inventor: Roy Swartz
  • Patent number: 4940131
    Abstract: A rotary valve for use in a particulate material handling system having an elevated device for holding a supply of the particulate material, a lower material receiving device and a remote control device. The rotary valve includes a housing having a rotor chamber, a side inlet communicating with the rotor chamber, a lower outlet communicating with the rotor chamber and communicable with the material receiving device, a rotor journalled in the rotor chamber having a plurality of radially disposed vanes and a slide valve disposed in the inlet for controlling the flow of material therethrough. The slide valve is operatively connected to the remote control device and is operated in response to the operating conditions sensed by sensing devices which are connected to the remote control device.
    Type: Grant
    Filed: November 16, 1989
    Date of Patent: July 10, 1990
    Assignee: Delaware Investments, Inc.
    Inventor: Roy Swartz
  • Patent number: 4940367
    Abstract: The fiber processing plant has a pneumatic flock feed system which is operated in dependence on an operating parameter which, in turn, is dependent upon the number of fiber processing machines which are operating at a given time. In one embodiment, a meter is disposed in a feed duct of the flock feed system between a fan and a first of the fiber processing machines in order to sense the static pressure therein. The meter is used to sense a difference in pressure caused by one or more fiber processing machines becoming inoperative so as to cause a switching on or off of the fiber supply to the feed duct.
    Type: Grant
    Filed: August 4, 1988
    Date of Patent: July 10, 1990
    Assignee: Rieter Machine Works, Ltd.
    Inventors: Christoph Staheli, Urs Staehli
  • Patent number: 4938637
    Abstract: The pneumatic conveying system according to the present invention includes a pneumatic transport pressure vessel having funnel-shaped sides and a closed domed top. The pneumatic transport presure vessel has a single inlet/outlet opening at the bottom of the funnel-shaped sides. The pneumatic transport pressure vessel is connected to a switch valve having a pipe section movable between first and second positions. In the first position, the switch valve connects the pneumatic transport pressure vessel to a positive displacement mechanical feeder to bottom load material from a storage hopper through the switch valve into the pneumatic transport pressure vessel. In the second position, the pipe section of the switch valve connects the pneumatic transport pressure vessel to discharge piping for conveying the material pneumatically to a desired discharge location.
    Type: Grant
    Filed: June 9, 1989
    Date of Patent: July 3, 1990
    Inventors: G. Wayne Lybecker, Timothy P. Sherrow
  • Patent number: 4911824
    Abstract: The amount of finely divided particulate solids added to a stream of fluid to form a mixture of the particulate solids and the fluid is determined by a method comprising (a) determining the temperature and quantity of fluid in a stream of fluid; (b) determining the temperature of the particulate solids; (c) determining the temperature of the mixture; and (d) calculating the amount of the particulate solids in the mixture. The method can also be used to control the amount of finely divided particulate solids added to the stream of a fluid. The fluid is at a different temperature than the finely divided solids.
    Type: Grant
    Filed: June 7, 1989
    Date of Patent: March 27, 1990
    Assignee: Atlantic Richfield Company
    Inventor: John J. Wakefield, Jr.
  • Patent number: 4900199
    Abstract: A system for feeding powder into high backpressure includes a carrier gas conduit with an orifice for entraining powder from a hopper, and a line for discharging feed gas at regulated pressure into the hopper to effect entrainment. A gas bleeder line has an outlet connection to the output carrier conduit, with a line pressure representative of carrier pressure. A differential pressure regulator equal to carrier pressure plus an increment. A regulated relief valve in the input carrier gas conduit provides a bleed gas supply to the bleeder line at a pressure equal to carrier pressure plus an increment. Pinch valves in the carrier conduit allow or prevent powder entrainment; alternatively, a rotatable sleeve is on the carrier conduit with a side opening alignable with the entrainment orifice. A carrier bypass conduit may be connected between the input conduit and the output conduit and hopper pressurization line may be connected between the output conduit and the hopper.
    Type: Grant
    Filed: October 21, 1988
    Date of Patent: February 13, 1990
    Assignee: The Perkin-Elmer Corporation
    Inventors: Mark F. Spaulding, Richard A. Goehring
  • Patent number: 4863316
    Abstract: A powder feeding system includes closed loop regulation of powder feed rate. A feed gas is discharged under constant pressure into an enclosed hopper. A valve is disposed to constrict a carrier conduit conveying powder in a carrier gas. A load cell measures the rate at which powder is flowing from the hopper through an intake orifice into the carrier conduit, and filtered flow rate signal is produced. A first controller produces a reference signal representative of the difference between a set point signal and the flow rate signal. A differential signal is produced corresponding to the pressure difference between the hopper pressure and a carrier conduit pressure taken between the intake orifice and the valve. A second controller produces a control signal representative of the difference between the differential signal and the reference signal. The valve is responsive to the control signal to proportionately constrict the carrier gas stream such as to regulate the powder flow rate.
    Type: Grant
    Filed: July 1, 1987
    Date of Patent: September 5, 1989
    Assignee: The Perkin-Elmer Corporation
    Inventors: Edward P. Gianella, Gregory Garistina
  • Patent number: 4784533
    Abstract: Solids drained from a fluidized bed 10 pass to a conical transition section 36 and through valve 50 to a pneumatic transport line 46. The flow of solids is controlled by controllably 56 introducing air 58 into the transition section 36.
    Type: Grant
    Filed: October 14, 1986
    Date of Patent: November 15, 1988
    Assignee: Combustion Engineering, Inc.
    Inventor: Bard C. Teigen
  • Patent number: 4749312
    Abstract: A granular product to be dosed is introduced at the same time as a transfer liquid into a dosing chamber below a retaining grid, provided in the upper part thereof. The measurement of the pressure upstream of the dosing chamber makes it possible to detect the arrival of the product level with the grid and to stop the introduction thereof. An inverted U-shaped pipe forming a syphon then ensures the transfer of the dosed product into a tank, when the compressed air is injected into the dosing chamber above the grid.
    Type: Grant
    Filed: April 9, 1987
    Date of Patent: June 7, 1988
    Assignee: Technicatome, Societe Technique pour l'Energie Atomique
    Inventor: Jean Raibaud
  • Patent number: 4743143
    Abstract: It is provided a powder flow-rate measuring apparatus wherein a conveying fluid is blown into the inlet of a detecting pipe line with a nozzle, a powder in fluidized state is introduced into said inlet, and the generated pressure difference due to acceleration of powder in the detecting pipe line is detected by means of a differential pressure gauge which communicates with an inlet side pressure detecting port arranged upstream the outlet of said nozzle and an outlet side pressure detecting port arranged at the outlet of detecting pipe line. The apparatus has characteristics stable for long period of time and is operable in a wide measuring range.
    Type: Grant
    Filed: September 12, 1986
    Date of Patent: May 10, 1988
    Inventor: Hideo Nagasaka
  • Patent number: 4738289
    Abstract: An apparatus for weighing granular or pulverulent bulk goods, where the bulk good is moved by reduced pressure from a silo through at least one conveyance duct to a scale and where the flow of material is lowered by increasing the proportion of air toward the end of the conveyance procedure, is designed in such a manner as to make possible accurate and precise metering at high conveyance rates.
    Type: Grant
    Filed: October 31, 1986
    Date of Patent: April 19, 1988
    Inventors: Andreas von Bennigsen-Mackiewicz, Christoph von Bennigsen-Mackiewicz
  • Patent number: 4718795
    Abstract: The difference in the pressure drop in a pneumatic discharge conduit between at least one discharge outlet into the conduit and a point downstream of the discharge outlet caused by lading in the discharge conduit is used to control opening and closing of the lading outlet valve to automatically control pneumatic unloading of lading from a container. In one application, the container is a railway hopper car having a plurality of pneumatic discharge outlets which discharge into a pneumatic discharge conduit.
    Type: Grant
    Filed: May 18, 1987
    Date of Patent: January 12, 1988
    Assignee: ACF Industries, Incorporated
    Inventor: Richard H. Dugge
  • Patent number: 4711607
    Abstract: An auger venturi conveying system for particulate materials includes a hopper-fed auger conveyor section for transporting the particulate material toward the discharge end of a barrel and a venturi arrangement for non-turbulent mixing of the material transported through the barrel with a pressurized gas flow. The venturi arrangement comprises a plenum chamber surrounding the barrel of the auger conveyor section adjacent the discharge end, a venturi pipe coupled to the plenum chamber having a tapered section leading to a constriction, and a jet member within the venturi pipe coupled to the discharge end of the barrel and extending approximately to the constriction. The outer surface of the jet member cooperates with the interior surface of the tapered section of the venturi pipe to form a narrow annular passage between the plenum chamber and the constriction of the venturi pipe. The venturi pipe is coupled at its other end to a conduit.
    Type: Grant
    Filed: October 22, 1985
    Date of Patent: December 8, 1987
    Assignee: Coalair Systems
    Inventors: Charles E. Wynosky, Joseph Mraz
  • Patent number: 4679704
    Abstract: This invention relates to apparatus for the pipe transport of material comprising non-slurried solids particles by means of a pipe which is generally upright. The material to be transported and also air are introduced at the top of the pipe. In order to prevent plug-up of the pipe the material and air flow rates are controlled by means of a central processing unit. A plurality of monitors located along the length of the pipe provide to the central processing unit signals indicative of the pressure in the pipe at the various locations.
    Type: Grant
    Filed: October 28, 1985
    Date of Patent: July 14, 1987
    Inventors: Raymond B. Dunlop, William E. G. Taylor
  • Patent number: 4677917
    Abstract: A high volume covered railway hopper car is disclosed which has vertical end walls so as to fully utilize the space over the trucks of the car for lading volume. An automatic pneumatic unloading system is provided so as to unload a pulverant lading from the end compartments or hoppers, as well as the center, of the car, thus eliminating the necessity of sloped end sheets. A pneumatic loading system is provided which permits loading from below and thus permits the elimination of hatches, walkways, and the like on the roof of the car so as to permit the roof to extend substantially the full extent of AAR height clearances thereby to further maximize the lading volume of the car.
    Type: Grant
    Filed: February 14, 1985
    Date of Patent: July 7, 1987
    Assignee: ACF Industries, Incorporated
    Inventors: Richard H. Dugge, Eugene J. Cordani
  • Patent number: 4613259
    Abstract: Apparatus for delivering two or more powders at any controlled ration to a thermal spray apparatus permits the controlled production of graded sprayed coatings. The apparatus also monitors and controls the position of the spray apparatus relative to the workpiece and varies this position during the deposition of the sprayed layers. The apparatus includes in-process mass flow gauges which measure in real time the flow rates of the various powders and report these rates to a supervisory controller which verifies these rates against the predetermined schedule and can shut down the apparatus in the event of a malfunction. The substrate being sprayed has its substrate temperature monitored and controlled according to a predetermined schedule by a supervising controller.
    Type: Grant
    Filed: November 28, 1984
    Date of Patent: September 23, 1986
    Assignee: United Technologies Corporation
    Inventors: Louis L. Packer, George S. Bosshart, Mark R. Jaworowski, Urban E. Kuntz
  • Patent number: 4594028
    Abstract: This invention presents apparatus and a process for the injection of metered amounts of pulverized materials by a pneumatic device into a vessel which is under variable pressure, and the application thereof to a shaft furnace.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: June 10, 1986
    Assignee: Paul Wurth S.A.
    Inventor: Leon Ulveling
  • Patent number: 4573504
    Abstract: Equipment for the removal of air out of pulverulent materials before the product is packaged or transferred. The equipment comprises a storage silo (1), out of which the pulverulent material to be packaged flows readily into the packaging vessel placed underneath. At a distance from the tight exterior wall (8) of the packaging vessel, there is a metallic porous face of lining material (9), through which it is possible to remove air out of the packaging vessel or to feed pressurized air into the packaging vessel through the space between the exterior wall of the packaging vessel and the said porous face of lining material. The space between the exterior wall of the packaging vessel and the face of lining material is divided air-tightly, in the direction of progress of the pulverulent material, by means of partition walls, into at least two, preferably three, four or five compartments (3 to 7) separate from each other.
    Type: Grant
    Filed: May 11, 1984
    Date of Patent: March 4, 1986
    Assignee: Erkomat Oy
    Inventor: Pertti Rosenstrom
  • Patent number: 4545410
    Abstract: A system for transferring dry flowable material includes a substantially closed vessel having an inlet and a discharge end. A cycle valve and venturi are arranged between a source of fluid pressure and the vessel such that the cycle valve may be selectively actuated to pass pressurized fluid directly to the vessel or through the venturi. A suction line interconnects the vessel to the throat section of the venturi such that passage of fluid flow through the venturi establishes a suction within the vessel.
    Type: Grant
    Filed: January 30, 1984
    Date of Patent: October 8, 1985
    Assignee: Cyclonaire Corporation
    Inventors: Kermit D. Paul, Charles F. Addams, Jr., Frederick S. Wuertele
  • Patent number: 4544306
    Abstract: The difference in the pressure drop in a pneumatic discharge conduit (5) between at least one discharge outlet (3) into the conduit and a point 9 downstream of the discharge outlet caused by lading in the discharge conduit is used to control opening and closing of the lading outlet valve 13 to automatically control pneumatic unloading of lading from a container. In one application, the container is a railway hopper car having a plurality of pneumatic discharge outlets 52, 52' and 52" which discharge into a pneumatic discharge conduit.
    Type: Grant
    Filed: February 18, 1982
    Date of Patent: October 1, 1985
    Assignee: ACF Industries, Incorporated
    Inventor: Richard H. Dugge
  • Patent number: 4502819
    Abstract: A constant discharge device for a pneumatic conveyor for powdery or granular materials includes a discharge regulator valve disposed in a pressure tank that stores the powdery or granular material and movable toward or away from a discharge nozzle which has an open end through which the material is discharged out of the pressure tank into a conveyor pipe. The discharge regulator valve has an air outlet for ejecting a stream of air toward the discharge nozzle. The amount of the material as discharged into the conveyor pipe can be controlled by adjusting the position of the discharge regulator valve with respect to the discharge nozzle, and also by adjusting the rate of flow of air through the outlet of the discharge regulator valve.
    Type: Grant
    Filed: June 14, 1982
    Date of Patent: March 5, 1985
    Assignee: Denka Engineering Kabushiki Kaisha
    Inventors: Shuzo Fujii, Koichi Abe, Hideo Miwa
  • Patent number: 4480947
    Abstract: A novel powder flow rate measuring apparatus having a simple structure is described herein, in which a conveying fluid is injected through a nozzle into an inlet of a single detecting pipe line having an inlet and an outlet, also a powder material within a powder tank is introduced into the same inlet, and a pressure difference between the inlet and outlet of the detecting pipe line at this moment is detected, whereby a flow rate of the powder material flowing through the detecting pipe line can be measured. The thereby obtained measured value is essentially very close to a mass flow rate of the powder material, and moreover the measured value can be obtained continuously.
    Type: Grant
    Filed: June 14, 1982
    Date of Patent: November 6, 1984
    Inventor: Hideo Nagasaka
  • Patent number: 4432675
    Abstract: The invention relates to improvements in air seeders, namely agricultural implements which utilize air pressure to move particulate material such as seeds from a feed zone to a dispersal or planting zone. The particulate material is normally fed from a hopper by a driven feed wheel or other similar mechanism. The invention provides a pressure pick-up at the source of air pressure, a conduit connecting the pick-up with a pneumatic actuator and a suitable linkage connecting the actuator with a clutch which is used to transmit drive power to the feed wheel. As long as there is sufficient pressure at the source the actuator will keep the clutch positioned to permit the feed wheel to operate. Should the pressure source fail the actuator will operate the clutch to stop transmitting power to the feed wheel and thus terminate the feeding of material which would otherwise clog the delivery conduits of the seeder.
    Type: Grant
    Filed: May 3, 1982
    Date of Patent: February 21, 1984
    Assignee: Morris Rod-Weeder Co. Ltd.
    Inventor: Cecil B. Machnee
  • Patent number: 4412762
    Abstract: A substantially continuous flow is attained in the unloading of a bulk particulate from a storage hopper by monitoring the pressure differential between the hopper and a point in the discharge line downstream of the hopper outlet. The pressure differential is sensed by a pressure switch in the discharge line which activates a vibrator on the hopper near the outlet when the differential is at a first predetermined value and deactivates the vibrator when the differential is at a second predetermined value, thereby maintaining the flow and reducing mechanical damage to the hopper.
    Type: Grant
    Filed: June 25, 1981
    Date of Patent: November 1, 1983
    Assignee: Pfizer Inc.
    Inventors: Richard H. Lepley, Thomas A. Happel
  • Patent number: 4381898
    Abstract: The invention contemplates a powder-feeding system for gas-propelled delivery of a powder to be controllably supplied, as to a flame-spraying gas torch or to a transferred-arc plasma torch. A fluidizing chamber receives (a) fluidizing-gas flow from below a porous screen, and (b) a restricted gravitational flow of powder at a relatively small central discharge location above the porous screen. A gas conduit extends transversely through the chamber between the powder-discharge location and the porous screen; it has a carrier-gas supply connection at one end and a gas-propelled powder-delivery connection at its other end. The conduit also has an upwardly extending opening virtually beneath and facing the powder-discharge location, but a shed interposed between this opening and the powder-discharge location sufficiently overlaps the opening to assure that no powder will pass through the opening and into the conduit unless it has been gas-fluidized.
    Type: Grant
    Filed: January 21, 1981
    Date of Patent: May 3, 1983
    Assignee: Eutectic Corporation
    Inventors: Anthony J. Rotolico, Eduardo Romero, John E. Lyons