US3729903A - Pneumatic dust collection system - Google Patents

Pneumatic dust collection system Download PDF

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Publication number
US3729903A
US3729903A US3729903DA US3729903A US 3729903 A US3729903 A US 3729903A US 3729903D A US3729903D A US 3729903DA US 3729903 A US3729903 A US 3729903A
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Prior art keywords
chamber
flushing
air chamber
air
opening
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English (en)
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F Espeel
E Ackermann
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Buehler AG
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Buehler AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/04—Cleaning filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002—Casings; Housings; Frame constructions
    • B01D46/0005—Mounting of filtering elements within casings, housings or frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/4272—Special valve constructions adapted to filters or filter elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/44—Auxiliary equipment or operation thereof controlling filtration
    • B01D46/444—Auxiliary equipment or operation thereof controlling filtration by flow measuring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
    • B01D46/60—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
    • B01D46/71—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with pressurised gas, e.g. pulsed air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/212—System comprising plural fluidic devices or stages
    • Y10T137/2125—Plural power inputs [e.g., parallel inputs]
    • Y10T137/2147—To cascaded plural devices

Definitions

  • ABSTRACT A pneumatic dust collection s siemiiiifid'fib'ii ing which defines a dust-air chamber portion, aflushing ai'fhiihbeib'ifibizind a clean air po rtion arranged one above the other.
  • a separating wall between the flushing air chamber and the dust-air chamber is penetrated by fittings for suspending filter hoses in the dust-air chamber portions which through the fittings into the flushing air chamber.
  • a connecting tube extends from the clean air chamber into the interior of each filter hose fitting and the filter hose which is carried thereby and defines an annular flow space between the interior of the hose and the flushing air chamber.
  • This annular flow space may be closed off by an inflatable member which is disposed at the connection of the fitting to the separating wall.
  • the connecting tube includes a widened portion around which the flow is diverted and which is located opposite to the inflatable membrane.
  • the interior of the inflatable membrane is connected to an air pressure line and it is inflated to close the annular flow passage between the interior of the filter hoses and the flushing air chamber.
  • the apparatus includes a control system for controlling flushing air to the flushing air chamber and for filling this chamber before the membrane is deflated.
  • An over and underpressure control is connected between the clean air chamber and the dust-air chamber to maintain a selected pressure difference between the clean air chamber portion and the dust-air chamber portion during operation.
  • the flushing air chamber and the control line for supplying the air to the chamber is closed by a rapid depressurizer member which is closed by a signal from a preferred output of a monostable fluid mechanism "elementfA n overpressure in he flushing air chamber causes the depressurizer to open rapidly.
  • This invention relates in general to the construction of a pneumatic dust collection system and in particular to a new and useful pneumatic dust collection system which includes a dust-air chamber portion, a flushing air chamber portion and a clean air chamber portion disposed in order so as to adjoin each other axially and being separated from each other by separating walls between each portion and which includes at least one filter hose disposed in a dust-air chamber with a connecting tube protruding axially into one end of the filter hose which connects the tube to the interior of the filter hose and with the clean air chamber, and which leaves a free annular space in a radial direction between it and.
  • the filter hose for the passage of flushing air from the flushing air chamber into the dust-air chamber, this passage being closable by an inflatable control member.
  • Dust collection systems are known in which there is an annular canal around a connecting pipe which interconnects a dust-air chamber with a clean air chamber and which is closed off against the flushing air chamber by a sleeve of laminations surrounding the connecting tube, in order to generate during a flushing air blast a vibratory motion acting upon the filter hose.
  • this necessitates that the flushing air chamber can only be filled with flushing air upon the release of a flushing air blast so that an overpressure can be built up in the filter hose by the flushing aironly gradually, which greatly reduces the cleaning effect.
  • the invention at hand aims at the improvement of an arrangement of the kind mentioned, to the end of generating in the filter hose a sudden overpressure by the rapid back flow of flushing air.
  • annular flow passage around the connecting tube is closable by an inflatable, rubber-elastic, annular membrane which is coaxial to the connecting tubes longitudinal axis and closes the annular canal when it is inflated by controlled air pressure while it opens the passage when it is in a depressurized condition.
  • the interior of the annular membrane is connected to a com pressed air source through a system of tubular lines which is regulated by control members to pressurize or depressure the annular membrane selectively, as well as to fill the flushing air chamber with flushing air before depressurizing the annular membrane.
  • an object of the invention to pro vide an improved dust collection system which includes a housing defining a dust-air chamber portion, a flushing air chamber portion, and a clean air chamber portion arranged one after the other and separated by separating walls and which includes at least one filter hose in the dust-air chamber which communicates at its interior through a connecting pipe to the clean air chamber and which includes a closable annular space around the connecting pipe which provides a communication between the interior of the hose and the flushing air chamber which is openable and closable by an inflatable membrane.
  • a further object of the invention is to provide a pneumatic dust collection system which includes a control line connected to the flushing air chamber having a rapid depressurizing connection thereto for depressurizing the line in the event of an overpressure.
  • a further object of the invention is to provide an im proved depressurizing valve mechanism for a pneumatic dust collection system.
  • a further object of the invention is to provide a pneumatic dust collection system and associated control mechanism therefor which are simple in design, rugged in construction and economical to manufacture.
  • FIG. 5 is a diaphragm of the control mechanism for the pneumatic dust collecting system
  • FIG. 6 is a vertical sectional view of a pressure switch associated with the air flushing chamber of the device.
  • FIG. 7 is a view similar to FIG. 4 of another embodiment of the invention.
  • FIGS. 1 through 6 comprises a pneumatic dust collection system which, as shown in FIG. 1, includes a dust-air chamber portion 1 in which is disposed a multiplicity of vertically arranged filter hoses 2. Toward the bottom the dust-air chamber 1 is provided with a conical dust collection chamber 3 which is closable by means of a gate valve 4. Ending tangentially in the dust-air chamber a dust-air line 5 connects tangentially into the dust-air chamber portion.
  • the dust-air chamber 1 is separated by a separating wall 6 from a flushing air chamber 7 which, in turn, is separated by a separating wall 8 from a clean air chamber 9 with a discharge nipple 10 for the clean air.
  • a separating wall 6 On the outside wall of the flushing air chamber 7 are disposed several rapid depressurizers 11, one of which is visible in FIG. 1.
  • Each filter hose is fastened by means of a pipe clamp 12 to a piece of pipe 13 which serves as a suspension for the hose and is attached to the separating wall 6 by means of screws 14.
  • the connecting tube forms part of a pneumatic valve generally designated 16.
  • the actuation of the pneumatic valve 16 is effected by the rapid depressurizer 11 via a control line 17, which are connected to several valves 16 for simultaneous actuation.
  • the control line 17 is connected to a compressed air source 19 (FIG. 5) which, through another supply line 20 (FIGS. 2 and 5), conveys compressed air into the flushing air chamber 7.
  • a branch line 21 each leads from the control line 17 to a valve 16.
  • the control line 17 is connected into the rapid depressurizer 11 through an opening 22 in a side wall 100 of the housing.
  • the rapid depressurizer 11 has a cylindrical jacket 23 (FIGS. 2 and 3 in which is disposed axially and welded to the wall of the flushing air chamber 7 a cylindrical part 24.
  • the free annular edge 25 of the cylindrical part 24 forms a valve seat for a rubber-elastic membrane 26.
  • screws 30, screwed into matching tapped holes in the wall of the flushing air chamber 7, a ring 31 and a dome-shaped cover 32 are screwed to the jacket 23.
  • the cover 32 is provided with a peripheral, annular groove 33, in which is inserted an annular bead 34 of the membrane 26.
  • the head 34 is retained between the annular groove 33 and the ring 31.
  • the membrane 26 has a central hole 35 which connects the pressure chamber 28 with a pressure equalization chamber 36.
  • On the side of the pressure chamber 28 the membrane 26 is provided with a flat sealing surface 37, and on the side of the pressure equalization chamber 36 with a flat sealing surface 38.
  • the cover 32 has a hole 39 and an external sealing surface 40. Attached to the cover 32, axial to the hole 39, by means of screws 41, are a first intermediate housing 42, a second intermediate housing 43 and a cover plate 44.
  • the intermediate housing 42 forms a venting chamber 48 which communicates through a hole 49 with the outside atmosphere, and it further has a hole 49 coaxial to hole 39.
  • the membrane 46 is provided with an axial hole 50.
  • Axial to hole 50, the second intermediate housing 43 present an opening 51 which empties into a venting chamber 52 communicating through a hole 53 with the outside atmosphere.
  • the cover plate 44 is provided with a connecting hole 54 which is axial to membrane 47 and which is connected through a line 65 to the output Yl of a correlated monostable fluid mechanism element M.
  • the rapid depressurizer described operates as follows: For the air pressure built up in the control line 17 by the compressed air source 19 to exist, the membrane 26 must make close contact with the valve seat 25 and must close the pressure chamber 28. For the membrane 26 to remain in the closed position shown in FIG. 3, the
  • the permanent signal of the fluid mechanism element M to the membrane 47 is interrupted so that the latter will free the opening 51 (see FIG. 3).
  • This causes the pressure of the air caught behind the membrane 46 to drop because it escapes to the outside through the opening 51 and the hole 53.
  • the consequence of this pressure drop is that the overpressure prevailing in the pressure chamber 36 lifts the membrane 46 from the opening 49 so that the air caught in the pressure equalization chamber 36 can escape to the outside through the opening 49, the venting chamber 48 and the hole 49.
  • the membrane 26 is placed in front of the hole 39 by the overpressure prevailing in the pressure chamber 28, and the compressed air flows out of the pressure chamber 28 into the venting chamber 29 and thence to the outside through the venting hole 27.
  • the connecting tube 15 (FIGS. 2 and 4) is conducted through a circular opening 56 in the separating wall 6, said opening 56 being of larger diameter than the outside diameter of the connecting tube 15 so that the flushing air enters the filter hose 2 through a canal of annular cross section.
  • the connecting tube 15 is provided with an annular bead 58 which serves as valve seat.
  • annular bead 58 which serves as valve seat.
  • a rubber-elastic annular membrane 60 which is put loosely around a ring 61.
  • the ring 61 presents a concave surface 62 which faces the annular bead 58 and is equispaced from it and against which the annular membrane 60 rests during a flushing air blast.
  • the pipe nipple 13, the annular membrane 60 and the ring 61 are fastened to the separating wall 6 by means of the screws 14.
  • the ring 61 is provided with a pressurizing canal or passage 64, one end of which connects to the branch line 21, the other end ending in the concave surface 62.
  • the lower part of the connecting tube may have various limital lengths L,, L, or L,,, as required. If, in accordance with length L, the connecting tube 15 is shorter than the pipe nipple 13, the blast of flushing air pulls the air flowing into, the clean air chamber 9 back into the filter hose 2. i
  • the blast of flushing air interrupts the clean air flow to the clean air chamber 9 without pulling the clean air back into the filter hose 2.
  • the clean air can flow, at least in part, into the clean air chamber 9 during the flushing air blast.
  • the dust collection system presents several rapid depressurizers 11 to 11", with each of which are associated severalvalves 16 (FIG. 2).
  • a pressure P1 prevails in, the clean air chamber 9;
  • a pressure P2 prevails in the flushing air chamber 7; and
  • a pressure P3 prevails in the dust-air chamber 1.
  • Disposed at the outside of the dustcollection system is an overpressure and underpressure differential switch 66 which is connected to the clean air chamber 9 through a line 67 and to the dust air chamber 1 through a line 68.
  • the pressure differential switch 66 is settable to a certain pressure difference P3 Pl, at which it responds.
  • the pressure differential switch 66 gives a signal via a line 69 to the'control input of a bistable element B with preferred initial position at the. output Y, (arrow), thereby initiating one or more flushing cycles, and keeping them up until the set pressure differential P3 P1 falls below the preset value of switch 66.
  • the signal arriving at the control X, of thebistableelement B generates a signal at the output Y,, by means of which the bistable element B controls an amplifier 70 connected to the compressed air source 19.
  • the amplifier 70 thereupon conducts, through a reducing valve 71, a supply current to the monostable elements M to M".
  • the amplifier 70 gives a signal to a pneumatic valve 72 which is opened for the duration of the signal. Due to the pneumatic valve 72 being opened, compressed air flows from the compressed air source 19 through a throttle valve 73 into the flushing air chamber 7. In addition, compressed air is introduced to the supply lines 18' to 18" through a throttle valve 74. All bistable elements B, B to B" communicate through a line 88 directly with the compressed air source 19 by which they are fed.
  • the flushing air chamber 7 is connected to a pressure switch 75. If the pressure P2 in the flushing air chamber exceeds a certain value, the pressure switch75 controls an Or-Nor key element 0, emitting a signal to its input X.
  • An Or-Nor key element is an element having two outputs Y, and Y,, one of which, (Y,, is preferred) is a control for air flow flowing through its control input X as long as there is a signal through the preferred output Y2.
  • the Or-Nor key element 0 gives a signal from the output Y, to the inputs E, and E, of a pulse transmitter 76 designed as a binary counter.
  • the pulse transmitter 76 has two outputs A, .and A,, one of which, A,, has the assignment of controlling the odd rapid depressurizers 11', 11" etc. and the other, A,, the even rapid depressurizers 11 1 1 etc.
  • a flushing air blast can be sent into the filter hoses 2 correlated with a rapid depressurizer 11, the membrane 47 (FIG. 3) must be lifted off the opening 51, because the valves 16 are closed as long as the membrane 47 closes the opening 51 and thus maintains the overpressure in the supply line 17.
  • the line 65, 65" etc. of each rapid depressurizer 11, 11 etc. is connected to the preferred output Y, of a correlated monostable element M, M" etc., whose signal generates an overpressure on the side of the membrane 47 facing away from the opening 51.
  • the bistable elements B, B are connected to the instable output Y, of the monostable element M, M etc. whichprecedes in the control cycle.
  • the other control input X, of the bistable element B, B is connected to the output Y, of the bistable element B, B" etc. which follow next in the flushing cycle.
  • the control input X, of the bistable element B, which is first in the flushing cycle is connected to the instable output Y, of the monostable element M", which is last in the flushingcycle.
  • In outputY is connected to the control input X, of the bistable element B which comes last in the flushing cycle.
  • the circuit described operates as follows: When the difference P3 P1 of the pressures in the dust air chamber 1 and in the clean air chamber 9 exceeds a certain value, the pressure differential switch 66 produces a signal to the control input X, of the bistable element B which, in turn, gives a signal from the control output Y, to the amplifier 70 which feeds all monostable elements M to M through the reducing valve 71. This causes the membranes 47 in each of the rapid depressurizers 11' to l1 (see FIGS. 2 and 3) to be pressed against the opening 51.
  • the amplifier 70 gives a signal to the: valve 72 connecting the flushing air chamber 7 with the compressed air source 19 on the one hand, and generating through the throttle valve 74 an overpressure in the lines 17 and 21 (see FIGS. 2 and 4) on the other, thus closing the valves 16.
  • the pressure P2 in the flushing air chamber 7 attains a certain value.
  • the pressure switch 75 is actuated which emits a signal to the control input X of the Or- Nor key element 0. This causes the Or-Nor key element to reverse, controlling through its output Y, the inputs E, and E of the pulse transmitter 76.
  • the pulse transmitter 76 Upon the first signal of the Or-Nor key element O-after the start ofa dust collecting campaign-the pulse transmitter 76 gives a pulse through the first output A, to the inputs X, of the And elements U, U" etc. correlated with the odd rapid depressurizers ll, 11 etc.
  • the first bistable element B of the bistable elements B, B" etc. which precede these odd And elements U, U” etc. gives a signal from the output Y, to the input X, of the And element U, whereas the other odd bistable element B'" etc. continues to blow a signal through their output Y,.
  • the first odd And element U generates a signal from its output Y to the input X of the monostable element M.
  • the monostable element M reverses and gives a signal through its not preferred output Y, to the input X, of the succeeding even bista ble element B".
  • a venting of the rapid depressurizer 11' takes place which means that the pressure built up behind the membrane 47 by the monostable element M drops. This causes the pressure in the lines 17, 21 (see FIGS. 2 and 4) to collapse and a flushing air blast ensues.
  • the bistable element B Due to the reversal of the bistable element B succeeding the monostable element M, the former generates a signal to the control input X, of the bistable element B which precedes in the flushing cycle.
  • the bistable element B" gives a signal from the output Y, to the input X, of the succeeding And element U".
  • the signal to the control input X, of the first bistable element B interrupts the signal to the control input X of the monostable element M, whereupon the latter again emits a signal through the stable output Y, to the rapid depressurizer 11, thereby causing the termination of the flushing air blast.
  • the second And element U which is already receiving a signal at its input X, from the bistable element B", now receives a pulse at its input X, and controls from output Y the input X of the monostable element M" which reverses to its not preferred output Y,.
  • This causes the rapid depressurizer 11 to be depressurized, and a blast of flushing air into the filter hoses 2 correlated with it ensues until the succeeding bistable element 8 sends from its output Y, signal to the control input X, of the bistable element B", thereby interrupting the signal to the control input X of the monostable element M" and terminating the flushing air blast.
  • the pressure drop occurring in the flushing air chamber 7 during this flushing air blast shuts off the pulse transmitter 76 through the pressure switch 76 and the Or-Nor key element 0.
  • the flushing air blast is terminated in the manner described above with reference to the rapid depressurizers 11, and 11'.
  • the flushing cycle continues in the described manner to the pressurization of the last rapid depressurizer 11".
  • the pressurization of the last rapid depressurizer 11 there is a signal through the output Y, of the monostable element M which is conducted to the control input X, of the bistable element B and the control input X, of the bistable element B.
  • the bistable element B then generates a signal from its output Y, to the input X, of the succeeding And element U, thereby readying the circuit for a new flushing cycle.
  • the same signal proceeds from the output Y, of the bistable element B to the control input X, of the last bistable element B, and the rapid depressurizer 11" is pressurized anew.
  • the signal to the control input X, of the bistable element B remains without influence as long as the latter receives a signal to its control input X, from the pressure differential switch 66.
  • the dust air supply is turned off so that the pressure differential P3 P1 between the dust air chamber and the clean air chamber becomes zero. This eliminates the signal to the input X, of the bistable element B so that it reverses upon the arrival of a signal from the monostable element M at the end of a flushing cycle, terminating the signal emanating from the output Y This interrupts the supply of air through the amplifier 70, and the feed current to the monostable element M etc. is thus shut off.
  • the outputs A, and A, of the pulse transmitter 76 are connected respectively to the output Y of a correlated And element U, and U
  • the inputs X, of the two And elements U, and U are connected respectively, via a time delay member C, and C to the output Y, of a correlated bistable element B, and 8,.
  • the outputs Y of the And elements U, and U, are each connected to the control inputs X, of the respective bistable elements B, and B, correlated with the other output.
  • the output Y, of the bistable elements B, and B is connected respectively to the control input X, of the bistable element correlated with the other output.
  • the input X, of the And elements is connected to the not preferred output Y, of the Or-Nor key element 0.
  • the second And element U will respond, giving a signal to the second output A of the pulse transmitter 76 and to the control input X of the first bistable element 8, which sends a signal to the input X, of the first And element U, with time delay due to the time delay member C whereupon the first And element U, is ready for a new signal through the output A and the described process repeats itself.
  • FIG. 6 shows a vertical section of the pressureswitch 76 in enlarged view.
  • Disposed in the wall of the flushing air chamber 7 is an opening which is closed by aflexible membrane 79. Fastened to said membrane is a central pin 80 projecting outward.
  • a line82 extendsaxial to the pin 80, and through a wall ofa housing 81 which is attached to the outsideof theflushing air chamber 7. Between the end .of the line 82 and the pin 80 is mounted a lever 83 which can pivot about a fixed shaft 84, the lever being provided with a packing 85.
  • the time interval between two flushing blasts can be I varied by adjusting the throttle valve 73 (FIG.
  • the duration ofa flushing blast can be freely selected by adjusting the throttle valve 74.
  • the pressure differential switch 66, the bistable element B, the amplifier 70 and the valve 72 are eliminated (see FIG. 5).
  • the throttle valves 73 and 74 as well as the reducing valve 71 are then connected directly to the compressed air source 19.
  • the input X of the first bistable element B is preceded by a manually operated starting elementcapable of producing a signal to the input X It is self-suggesting to the specialist to operate the dust collecting system with a suitable gas other than the above-described flushing air.
  • the rapid depressurizers may be eliminated.
  • One or more of the annular membranes are then pressurized or depressurized directly by a fluid mechanism with a great exhaust air current.
  • FIG. 7 shows another embodiment which includes a pneumatic valve 16 with a double filter hose 2'.
  • the double filter hose 2' has an external filter hose 2" and an internal filter hose 2", coaxial to and spaced from the fonner.
  • the ends of the filter hoses 2" and 2" facing away from the valve 16' are firmly interconnected and they close off the interior of the filter hose 2' against the dust air chamber 1.
  • the end of the internal filter hose 2" facing the valve 16' is closed.
  • the flushing air blast is aimed and unbraked between the filter hoses 2" and 2" because the internal filter hose 2" is disposed so as to be coaxial with and spaced from the connecting tube 15' and has approximately the same outside diameter as the tube.
  • the flushing air does not impinge the closing surface 89 of the internal filter hose 2", thus avoiding a backwash of the flushing air blast.
  • this combination offers the advantage of reducing the mechanical stress on the filter hoses.
  • a pneumatic dust collection system comprising a housing defining a dust air chamber portion, a flushing air chamber portion and a clean-air portion arranged one after the other and with a first separating wall between said clean-air portion and said flushing air portion and a second separating wall between said flushing-air portion and said dust air portion, at least one filter hose disposed in said dust air chamber portion, a connecting tube extending axially through said second separating wall into one end of said filter hose and connecting the interior of said filter hose to said clean-air chamber portion and being spaced from the interior of said filter hose to define an annular flow passage between said connecting tube and said filter hose and from said dust air chamber to said flushing air chamber, an inflatable annular member located in 'said flow passage and being inflatable to close said flow passage, and control air passage means connected to said flushing chamber and said flow chamber for deflating and inflating said membrane and for filling the flushing chamber with flushing air before said membrane is deflated to open said air flow passage.
  • a pneumatic dust collection system wherein there are a plurality of filter hoses in said dust air chamber, each having an annular membrane for opening and closing said flow passage, said control air passage means including a control line c0nnected to said inflatable membranes for pressurizing and depressurizing said membranes, compressed air supply means connected to said control line, and a rapid depressurizer member connected to said control line.
  • a pneumatic dust collection system according to claim 1, wherein said collecting tube includes an annular bead extending into said flow passage and forming a valve seat for said inflatable membrane.
  • a pneumatic dust collection system including a sleeve member connected to said second partition wall and having a portion extending into said dust air chamber, said filter hose being engaged around said sleeve member, said inflatable membrane being located between said sleeve member and said second separating wall between said flushing chamber and said dust air chamber.
  • a pneumatic dust collector according to claim 4, wherein said sleeve member includes a flange, an annular member disposed between said flange and said second separating wall, said inflatable member bring engaged over said annular member, said annular member having a passage therein for the flow of inflation air to inflate said inflatable membrane, and fastening means extending through said flange and said annular member to fasten said flange and said annular member to said second separating wall.
  • a pneumatic dust collection system according to claim 5, wherein said annular member has an interior concave surface covered by said inflatable membrane.
  • control air passage means includes an air pressure control line extending into said flushing chamber and having connections to said inflatable membrane, a rapid depressurizer control connected to said control line, said depressurizer including a valve member having a wall with an opening which communicates with said control line, an annular wall at the interior of said member arranged around said opening, a flexible diaphragm covering said annular wall and forming a pressure chamber in said body connected to said control line, said membrane extending radially beyond said pressure chamber, and 'a cover supporting the annular periphery of said membrane closing the opposite side of said body and forming a pressure equalizing chamber on the opposite side of said diaphragm, said diaphragm having a hole extending therethrough communicating with said pressure chamber, an intermediate housing mounted on said cover having an opening in one end communicating with said pressure equalizing chamber of said cover, said intermediate housing defining an annular lip around said opening forming a seat, a diaphragm stretched across said seat enclo
  • a pneumatic dust system including a second intermediate housing with a venting chamber (52) said diaphragm (46) extending beyond said opening (49) radially and joined peripherally to said second intermediate housing (43) for the formation of said cavity, said second venting chamber (52) being connected through an opening (50) in said second membrane (46) and through an opening (51) in said wall of said second housing (43), the opening (51) being closable by means of a third membrane (47) enclosing with a cover (44) a cavity which is pressurizable and depressurizable by means of the fluid mechanism element.
  • a pneumatic dust collection system wherein said annular membrane is pressurizable by a compressed air source and depressurizable by means of said control members, said control members providing fluid mechanism elements.
  • a pneumatic dust collection system wherein said rapid depressurizer is connected to signal means including a preferred output (Y1) of a monostable fluid mechanism element (M), said signal being responsive to an overpressure in said flushing air chamber to control input (X) of said monostable element (M).
  • Pneumatic dust collection system characterized in that a pressure differential switch (66) is provided in order to open the supply current line between the monostable element (M) and the compressed air source (19) above a certain pressure differential (P3 Pl) between the dust air chamber (1) and the clean air chamber (9), and to close it below said certain pressure differential.
  • a pressure differential switch (66) is provided in order to open the supply current line between the monostable element (M) and the compressed air source (19) above a certain pressure differential (P3 Pl) between the dust air chamber (1) and the clean air chamber (9), and to close it below said certain pressure differential.
  • Pneumatic dust collection system characterized in that several rapid depressurizers (11' to 11'') with correlated valves (16) are present; in that the control input (X) of the monostable element (M to M") of each rapid depressurizer is connected to the output (Y) of a correlated And element (U' to U"); in that the one input (X of the And element U to U") is connected to the output of a preceding, bistable element (3' to B"); in that the control input (X of each bistable element (8' to B") is connected to the output (Y of the bistable element succeeding the correlated monostable element, the control input (X,) of said bistable element being connected to the not preferred output (Y of the preceding monostable element; in that the second inputs (X of the odd And elements (U', U etc.) are connected to the first output (A, ofa pulse transmitter (76); and in that the second inputs (X of the even And elements (U, U" etc.) are
  • Pneumatic dust collection system characterized in that, for the purpose of triggering a flushing cycle, the signal output of the pressure differential switch (66) is connected to the control input (X of a bistable element (B) which opens, by signal through its output (Y,), a pneumatic amplifier (70) in the supply current line of the monostable elements (M' to M") and in that, for the purpose of terminating a flushing cycle, the control input (X2) of the bistable element (B) is connected to the instable' output (Y,) of the last monostable element (M').
  • Pneumatic dust collection system characterized in that the pulse transmitter (76) has two inputs (E E each of which being connected to the input (X,) of a correlated end element (U,, U,) whose outputs (Y) are respectively connected to the outputs (A,, A,); in that the input (X,) of each And element (U,, U,) is connected, via a time delay member each (C C to the output (Y,) of a correlated bistable element (8,, 8,); in that the output (Y) of each And element (U U is connected to the input (X,) of the bistable element correlated with the other And element; and in that each output (Y of the bistable elements (8,, 8,) is connected to the input (X,) of the other bistable element.
  • Pneumatic dust collection system characterized in that the two inputs (E,, E of the pulse transmitter (76) are connected to the output (Y of an Or-Nor key element whose input (X) is closable by a pressure switch (75) controllable by the pressure (p2) in the flushing air tank, in such a manner that the input (X) is closed when the pressure (p2) exceeds a certain value.
  • said filter hose comprises a double filter hose including an internal hose portion disposed coaxial to and spaced from the interior of said filter hose outer portion and having a closed inner end spaced from the inner end of said connecting tube having substantially the same diameter as said connecting tube.
  • a depressurizing valve for a control air pressure line of a valve for regulating the flow of a flushing air to the interior of a filter hose in a pneumatic dust collection system comprising a valve body having a wall adapted to be connected to or formed as a wall of the flushing chamber and having a hollow interior with a first opening in said wall for communication to the flushing chamber, and a first annular wall surrounding the opening and forming a first seat, a first diaphragm extending across the interior of said valve body and over said first seat to close off a pressure chamber within said first annular wall and communication with said first opening, a cover extending over said first diaphragm and having a central second opening, a first intermediate tubular housing engaged over said cover and sealed peripherally around said second opening and having a central third opening communicating with said second opening, a second interior projection around said third opening defining a second seat, a second diaphragm extending across the interior of said first intermediate tubular housing and closing said second seat, a second intermediate

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Cleaning In General (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Fluid-Pressure Circuits (AREA)
US3729903D 1970-08-28 1971-08-24 Pneumatic dust collection system Expired - Lifetime US3729903A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1290270A CH527635A (de) 1970-08-28 1970-08-28 Pneumatische Entstaubungsanlage

Publications (1)

Publication Number Publication Date
US3729903A true US3729903A (en) 1973-05-01

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ID=4387449

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US3729903D Expired - Lifetime US3729903A (en) 1970-08-28 1971-08-24 Pneumatic dust collection system

Country Status (12)

Country Link
US (1) US3729903A (de)
JP (1) JPS5013980B1 (de)
AR (1) AR195369A1 (de)
AT (1) AT323709B (de)
BR (1) BR7105652D0 (de)
CA (1) CA965712A (de)
CH (1) CH527635A (de)
ES (1) ES394382A1 (de)
FR (1) FR2106175A5 (de)
GB (1) GB1347060A (de)
SE (1) SE375241B (de)
SU (1) SU557739A3 (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3818940A (en) * 1971-07-20 1974-06-25 Buehler Ag Geb Pneumatic control system for air filter cleaning apparatus
US3826066A (en) * 1971-07-16 1974-07-30 Summit Filter Corp Double-wall filter bag construction
US3850594A (en) * 1971-07-16 1974-11-26 Summit Filter Corp Filtering method utilizing a double-wall filter bag construction
US3874857A (en) * 1974-01-07 1975-04-01 Spencer Turbine Co Apparatus for filtering particulate matter from gas and having reverse flow cleaning means
US3963467A (en) * 1973-03-08 1976-06-15 Rolschau David W Dust filter apparatus
US4113449A (en) * 1977-08-26 1978-09-12 Standard Havens, Inc. Baghouse cleaning method
US4299604A (en) * 1980-05-27 1981-11-10 Donaldson Company, Inc. Air inducer and backwasher for an air cleaner
US4435197A (en) 1982-04-09 1984-03-06 The Bahnson Company Baghouse filter
US4632680A (en) * 1985-10-28 1986-12-30 Carter-Day Co. Planar sided air shaping inserts for filter bags
US4680038A (en) * 1984-06-18 1987-07-14 Frank Titus Cyclone filter with all metal filtering candle
US4726820A (en) * 1985-10-19 1988-02-23 Stanelle Karl Heinz Process for cleaning the dust filter of a silo
US5296010A (en) * 1991-12-03 1994-03-22 Coal Industry (Patents) Limited Ceramic candle filter arrangements
US5474585A (en) * 1994-05-18 1995-12-12 Pall Corporation Filtering apparatus
US6302931B1 (en) * 1999-05-03 2001-10-16 Hung Ki Min Apparatus for injecting compressed air into dust collector
US6332902B1 (en) 2000-02-02 2001-12-25 Niro A/S Filter unit having a filter cleaning nozzle associated with the filter unit and including a guide body
US20040035091A1 (en) * 2002-08-21 2004-02-26 Wang Chun Hsiang Dust-removing device for the filtering tube of a dust-collecting apparatus
DE10308984B4 (de) 2003-03-01 2018-09-27 Hartwig Straub Vorrichtung und Verfahren zum Betreiben eines explosionssicheren Schüttgutfilterapparates
CN110170211A (zh) * 2019-06-11 2019-08-27 刘术毅 一种自去尘型袋式除尘器

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191725A (en) * 1978-06-28 1980-03-04 Sperry Corporation Method of assembling a contrast enhanced display
SE7901181A0 (sv) * 1979-02-12 1980-08-13 Fläkt Ab Sätt att styra rensförloppet vid rensning av filtermaterialet vid textila spärrfilter
JPS568034U (de) * 1979-06-30 1981-01-23
AT403256B (de) * 1996-07-31 1997-12-29 Scheuch Alois Gmbh Verfahren zur steuerung der abreinigung von filtern

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3167415A (en) * 1959-11-02 1965-01-26 Nailsea Engineering Company Lt Cleaning devices for gas filtering apparatus
US3333401A (en) * 1964-07-09 1967-08-01 Harry I Abboud Dust collection apparatus
US3429106A (en) * 1967-05-22 1969-02-25 Harry I Abboud Aerosol filtering apparatus
US3498030A (en) * 1967-11-01 1970-03-03 John L Wilki Cleaning devices for gas filtering apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3167415A (en) * 1959-11-02 1965-01-26 Nailsea Engineering Company Lt Cleaning devices for gas filtering apparatus
US3333401A (en) * 1964-07-09 1967-08-01 Harry I Abboud Dust collection apparatus
US3429106A (en) * 1967-05-22 1969-02-25 Harry I Abboud Aerosol filtering apparatus
US3498030A (en) * 1967-11-01 1970-03-03 John L Wilki Cleaning devices for gas filtering apparatus

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826066A (en) * 1971-07-16 1974-07-30 Summit Filter Corp Double-wall filter bag construction
US3850594A (en) * 1971-07-16 1974-11-26 Summit Filter Corp Filtering method utilizing a double-wall filter bag construction
US3818940A (en) * 1971-07-20 1974-06-25 Buehler Ag Geb Pneumatic control system for air filter cleaning apparatus
US3841065A (en) * 1971-07-20 1974-10-15 Buehler Ag Geb Pneumatic control system for air filter cleaning apparatus
US3963467A (en) * 1973-03-08 1976-06-15 Rolschau David W Dust filter apparatus
US3874857A (en) * 1974-01-07 1975-04-01 Spencer Turbine Co Apparatus for filtering particulate matter from gas and having reverse flow cleaning means
US4113449A (en) * 1977-08-26 1978-09-12 Standard Havens, Inc. Baghouse cleaning method
US4299604A (en) * 1980-05-27 1981-11-10 Donaldson Company, Inc. Air inducer and backwasher for an air cleaner
US4435197A (en) 1982-04-09 1984-03-06 The Bahnson Company Baghouse filter
US4680038A (en) * 1984-06-18 1987-07-14 Frank Titus Cyclone filter with all metal filtering candle
US4726820A (en) * 1985-10-19 1988-02-23 Stanelle Karl Heinz Process for cleaning the dust filter of a silo
US4632680A (en) * 1985-10-28 1986-12-30 Carter-Day Co. Planar sided air shaping inserts for filter bags
US5296010A (en) * 1991-12-03 1994-03-22 Coal Industry (Patents) Limited Ceramic candle filter arrangements
US5474585A (en) * 1994-05-18 1995-12-12 Pall Corporation Filtering apparatus
US6302931B1 (en) * 1999-05-03 2001-10-16 Hung Ki Min Apparatus for injecting compressed air into dust collector
US6332902B1 (en) 2000-02-02 2001-12-25 Niro A/S Filter unit having a filter cleaning nozzle associated with the filter unit and including a guide body
US20040035091A1 (en) * 2002-08-21 2004-02-26 Wang Chun Hsiang Dust-removing device for the filtering tube of a dust-collecting apparatus
DE10308984B4 (de) 2003-03-01 2018-09-27 Hartwig Straub Vorrichtung und Verfahren zum Betreiben eines explosionssicheren Schüttgutfilterapparates
CN110170211A (zh) * 2019-06-11 2019-08-27 刘术毅 一种自去尘型袋式除尘器

Also Published As

Publication number Publication date
FR2106175A5 (de) 1972-04-28
AR195369A1 (es) 1973-10-08
SU557739A3 (ru) 1977-05-05
DE2141241B2 (de) 1976-10-21
DE2141241A1 (de) 1972-03-02
SE375241B (de) 1975-04-14
CA965712A (en) 1975-04-08
JPS5013980B1 (de) 1975-05-23
BR7105652D0 (pt) 1973-05-03
AT323709B (de) 1975-07-25
CH527635A (de) 1972-09-15
GB1347060A (en) 1974-02-13
ES394382A1 (es) 1975-05-16

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