US3729903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic dust collection system
Assignee: Buehler AG
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Filing: 1971-08-24
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Granted: 1973-05-01
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Expires: 1991-08-24
Abstract
Abstract A pneumatic dust collection system includes a housing which defines a dust-air chamber portion, a flushing air chamber portion and a clean air portion 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 communicate 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. At this annular space 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 element. An overpressure in he flushing air chamber causes the depressurizer to open rapidly.
Inventors
- 👤 F Espeel
- 👤 E Ackermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:57
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/0002; B01D46/0005; B01D46/42; B01D46/4272; B01D46/44; B01D46/444; B01D46/56; B01D46/58; B01D46/60; B01D46/66; B01D46/70; B01D46/71; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/212; Y10T137/2125; Y10T137/2147
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
191 words
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.
Claim 2
Dependent Claim
191 words
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.
Claim 3
Dependent Claim
73 words
A pneumatic dust collection system, according to claim 1, 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 connected 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.
Claim 4
Dependent Claim
31 words
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.
Claim 5
Dependent Claim
61 words
A pneumatic dust collection system, according to claim 1, 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.
Claim 6
Dependent Claim
78 words
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.
Claim 7
Dependent Claim
23 words
A pneumatic dust collection system, according to claim 5, wherein said annular member has an interior concave surface covered by said inflatable membrane.
Claim 8
Dependent Claim
243 words
A pneumatic dust system, according to claim 1, wherein said 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 enclosing said seat and having an opening therethrough, the space around said forming a venting chamber to the atmosphere, the opening of said intermediate housing being communicatable when said membrane is lifted from said annular seat to said venting chamber, and closing means covering said intermediate housing having a cavity which is pressurizable or depressurizable by a fluid mechanism element.
Claim 9
Dependent Claim
102 words
A pneumatic dust system, according to claim 7, 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.
Claim 10
Dependent Claim
35 words
A pneumatic dust collection system, according to claim 7, 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.
Claim 11
Dependent Claim
51 words
A pneumatic dust collection system, according to claim 2, 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).
Claim 12
Dependent Claim
66 words
Pneumatic dust collection system, according to subclaim 10, 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 - P1) between the dust air chamber (1) and the clean air chamber (9), and to close it below said certain pressure differential.
Claim 13
Dependent Claim
209 words
Pneumatic dust collection system, according to sub-claim 10, characterized in that several rapid depressurizers (11'' to 11n) with correlated valves (16) are present; in that the control input (X) of the monostable element (M'' to Mn) of each rapid depressurizer is connected to the output (Y) of a correlated And element (U'' to Un); in that the one input (X1) of the And element U'' to Un) is connected to the output of a preceding, bistable element (B'' to Bn); in that the control input (X2) of each bistable element (B'' to Bn) is connected to the output (Y2) of the bistable element succeeding the correlated monostable element, the control input (X1) of said bistable element being connected to the not preferred output (Y2) of the preceding monostable element; in that the second inputs (X2) of the odd And elements (U'', U'''''' etc.) are connected to the first output (A1) of a pulse transmitter (76); and in that the second inputs (X2) of the even And elements (U'''', U'''''''' etc.) are connected to the second output (A2) of the pulse transmitter (76) which, upon the repeated attainment of the preselected flushing pressure (P2) in the flushing air chamber (7), generates an alternating pulse through the outputs (A1 and A2).
Claim 14
Dependent Claim
97 words
Pneumatic dust collection system, according to subclaim 12, 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 (X1) of a bistable element (B) which opens, by signal through its output (Y2), 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 (Y2) of the last monostable element (Mn).
Claim 15
Dependent Claim
129 words
Pneumatic dust collection system, according to subclaim 12, characterized in that the pulse transmitter (76) has two inputs (E1, E2), each of which being connected to the input (X2) of a correlated end element (U1, U2) whose outputs (Y) are respectively connected to the outputs (A1, A2); in that the input (X1) of each And element (U1, U2) is connected, via a time delay member each (C1, C2), to the output (Y1) of a correlated bistable element (B1, B2); in that the output (Y) of each And element (U1, U2) is connected to the input (X2) of the bistable element correlated with the other And element; and in that each output (Y1) of the bistable elements (B1, B2) is connected to the input (X1) of the other bistable element.
Claim 16
Dependent Claim
71 words
Pneumatic dust collection system, according to subclaim 14, characterized in that the two inputs (E1, E2) of the pulse transmitter (76) are connected to the output (Y1) of an Or-Nor key element (O) 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.
Claim 17
Dependent Claim
61 words
A pneumatic dust collection system, according to claim 1, wherein 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.
Claim 18
Dependent Claim
261 words
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 housing engaged over said first intermediate housing and having a fourth opening in communication with the space between said second diaphragm and said second intermediate housing, a third diaphragm carried in said second intermediate housing said second intermediate housing having an opening with a third seat closed by said third diaphragm and a cover closing said second intermediate housing and having an opening for communication with a pressure air supply.
Claim 19
Dependent Claim
261 words
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 housing engaged over said first intermediate housing and having a fourth opening in communication with the space between said second diaphragm and said second intermediate housing, a third diaphragm carried in said second intermediate housing said second intermediate housing having an opening with a third seat closed by said third diaphragm and a cover closing said second intermediate housing and having an opening for communication with a pressure air supply.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |