US3680285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modular bag-type filter for gases
Assignee: CARTER-DAY COMPANY A MINNESOTA CORP
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Filing: 1970-11-23
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Granted: 1972-08-01
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Expires: 1990-11-23
Abstract
Abstract A dust filter module having a hollow housing in which a plurality of tubular filter bags are arranged in several parallel rows and suspended from a tube sheet separating a dusty air section from a clean air section of the housing interior, the filter bags hanging into the dusty air section with their upper ends opening into the clean air section through respective apertures in the tube sheet, each filter bag having a rigid collar at its open end adapted to be removably attached to the tube sheet from the dusty air side thereof by a bayonet-type connection. A reverse flow filter bag flushing system is provided in which a flushing air conduit for each row of filter bags extends into the clean air section directly above and parallel with the respective row of filter bags and has a series of individual spouts each directed into a flow nozzle extending into the open end of a respective filter bag. The several conduits have their outer ends extending into a common valve chest which has direct connection with a reservoir of compressed air and which includes individual pilot-controlled pressure-actuated diaphragms each contoured to engage and normally close the outer end of a respective flushing air conduit, and means is provided for operating said diaphragms sequentially.
Inventors
- 👤 Wayne G Wellan
- 👤 John O Converse
- 👤 Arden E Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:18
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/0002; B01D46/0004; B01D46/42; B01D46/4272; B01D46/66; B01D46/70; B01D46/71; B01D2265/00; B01D2265/02; B01D2265/022; B01D2271/00; B01D2271/02; B01D2271/022
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
363 words
A dust filter for cleaning a particle-laden gaseous medium comprising a. a rectangular housing having a dusty-gas section and a cleangas section defined by a tube sheet separating one section from the other, 1. said tube sheet having a plurality of parallel rows of openings therein, and 2. a tubular filter bag having a closed end extending into the dusty-gas section from each tube sheet opening and having an open end communicating with the clean-gas section thru the said opening, b. a rigid collar attached to the open end of each filter bag and adapted for detachable connection with the tube sheet thru a respective opening thereof, c. a plurality of flushing-gas conduits in said clean-gas section each extending above and parallel with a respective row of tube sheet openings, each of said conduits having a series of gas-discharge spouts thereon and each spout extending into a respective filter bag opening, and each conduit being open at its rearward end for the introduction of flushing gas thereinto, d. a box-like valve chest enclosing the rearward open ends of the flushing-gas conduits and in continuous communication with a reservoir of pressured flushing gas, e. a diaphragm valving member mounted in said valve chest in opposition to the open end of each conduit and movable axially toward said open end to close it and liftable off said open end to open it, each diaphragm being marginally mounted on the wall of the valve chest opposite the open end of the conduit to provide a pressure chamber on the side of the diaphragm opposite the conduit opening and having a bleed passage therethrough for admitting gas pressure from the valve chest into said pressure chamber for holding the diaphragm in conduit-closing position, a Pilot passage leading outwardly of the valve chest from each of said pressure chambers, and pilot means for each pilot passage for controlling gas flow therethrough and thereby the conduit opening operation of the respective diaphragm, and f. means for operating said pilot means sequentially whereby said conduits are opened individually one after the other for discharging pressure gas from the valve chest into all tube sheet openings of a respective row simultaneously.
Claim 2
Dependent Claim
363 words
A dust filter for cleaning a particle-laden gaseous medium comprising a. a rectangular housing having a dusty-gas section and a cleangas section defined by a tube sheet separating one section from the other, 1. said tube sheet having a plurality of parallel rows of openings therein, and 2. a tubular filter bag having a closed end extending into the dusty-gas section from each tube sheet opening and having an open end communicating with the clean-gas section thru the said opening, b. a rigid collar attached to the open end of each filter bag and adapted for detachable connection with the tube sheet thru a respective opening thereof, c. a plurality of flushing-gas conduits in said clean-gas section each extending above and parallel with a respective row of tube sheet openings, each of said conduits having a series of gas-discharge spouts thereon and each spout extending into a respective filter bag opening, and each conduit being open at its rearward end for the introduction of flushing gas thereinto, d. a box-like valve chest enclosing the rearward open ends of the flushing-gas conduits and in continuous communication with a reservoir of pressured flushing gas, e. a diaphragm valving member mounted in said valve chest in opposition to the open end of each conduit and movable axially toward said open end to close it and liftable off said open end to open it, each diaphragm being marginally mounted on the wall of the valve chest opposite the open end of the conduit to provide a pressure chamber on the side of the diaphragm opposite the conduit opening and having a bleed passage therethrough for admitting gas pressure from the valve chest into said pressure chamber for holding the diaphragm in conduit-closing position, a Pilot passage leading outwardly of the valve chest from each of said pressure chambers, and pilot means for each pilot passage for controlling gas flow therethrough and thereby the conduit opening operation of the respective diaphragm, and f. means for operating said pilot means sequentially whereby said conduits are opened individually one after the other for discharging pressure gas from the valve chest into all tube sheet openings of a respective row simultaneously.
Claim 3
Dependent Claim
48 words
A dust filter as defined by claim 1 wherein each of the gas discharge spouts supports a concentric flow nozzle which extends into the respective filter bag beyond the spout and which has a funnel-like inlet projecting above the filter bag opening into the said clean gas section.
Claim 4
Dependent Claim
315 words
a tubular filter bag having a closed end extending into the dusty-gas section from each tube sheet opening and having an open end communicating with the clean-gas section thru the said opening, b. a rigid collar attached to the open end of each filter bag and adapted for detachable connection with the tube sheet thru a respective opening thereof, c. a plurality of flushing-gas conduits in said clean-gas section each extending above and parallel with a respective row of tube sheet openings, each of said conduits having a series of gas-discharge spouts thereon and each spout extending into a respective filter bag opening, and each conduit being open at its rearward end for the introduction of flushing gas thereinto, d. a box-like valve chest enclosing the rearward open ends of the flushing-gas conduits and in continuous communication with a reservoir of pressured flushing gas, e. a diaphragm valving member mounted in said valve chest in opposition to the open end of each conduit and movable axially toward said open end to close it and liftable off said open end to open it, each diaphragm being marginally mounted on the wall of the valve chest opposite the open end of the conduit to provide a pressure chamber on the side of the diaphragm opposite the conduit opening and having a bleed passage therethrough for admitting gas pressure from the valve chest into said pressure chamber for holding the diaphragm in conduit-closing position, a Pilot passage leading outwardly of the valve chest from each of said pressure chambers, and pilot means for each pilot passage for controlling gas flow therethrough and thereby the conduit opening operation of the respective diaphragm, and f. means for operating said pilot means sequentially whereby said conduits are opened individually one after the other for discharging pressure gas from the valve chest into all tube sheet openings of a respective row simultaneously.
Claim 5
Dependent Claim
315 words
a tubular filter bag having a closed end extending into the dusty-gas section from each tube sheet opening and having an open end communicating with the clean-gas section thru the said opening, b. a rigid collar attached to the open end of each filter bag and adapted for detachable connection with the tube sheet thru a respective opening thereof, c. a plurality of flushing-gas conduits in said clean-gas section each extending above and parallel with a respective row of tube sheet openings, each of said conduits having a series of gas-discharge spouts thereon and each spout extending into a respective filter bag opening, and each conduit being open at its rearward end for the introduction of flushing gas thereinto, d. a box-like valve chest enclosing the rearward open ends of the flushing-gas conduits and in continuous communication with a reservoir of pressured flushing gas, e. a diaphragm valving member mounted in said valve chest in opposition to the open end of each conduit and movable axially toward said open end to close it and liftable off said open end to open it, each diaphragm being marginally mounted on the wall of the valve chest opposite the open end of the conduit to provide a pressure chamber on the side of the diaphragm opposite the conduit opening and having a bleed passage therethrough for admitting gas pressure from the valve chest into said pressure chamber for holding the diaphragm in conduit-closing position, a Pilot passage leading outwardly of the valve chest from each of said pressure chambers, and pilot means for each pilot passage for controlling gas flow therethrough and thereby the conduit opening operation of the respective diaphragm, and f. means for operating said pilot means sequentially whereby said conduits are opened individually one after the other for discharging pressure gas from the valve chest into all tube sheet openings of a respective row simultaneously.
Claim 6
Dependent Claim
42 words
A dust filter according to claim 1 wherein an inspection passage and a walk-way therein are provided thru the dusty-air section and between the filter bags whereby an operator can reach each of the filter bag collars attached to the tube sheet.
Claim 7
Dependent Claim
128 words
A modular dust filter assembly comprising a plurality of identical subsidiary filter portions constructed according to claim 1 and arranged in connected side-by-side relation, end walls closing the ends of the said assembly, each filter portion having a plurality of rows of filter bags extending from a respective tube sheet, the dusty-gas and clean-gas sections of each filter portion opening to the corresponding sections of an adjoining portion of the filter assembly, the open ends of the flushing-gas conduits of each filter portion being enclosed by a valve chest individual to it, and the conduit-closing diaphragms of the several valve chests being operated one at a time in predetermined sequence by the pilot means to open a respective conduit and flush the row of filter bags aligned therewith.
Claim 8
Dependent Claim
108 words
A dust filter assembly according to claim 4 wherein the clean-gas section of each filter portion is located above the dusty-gas section thereof and the said sections are separated by a horizontal tube sheet having gas-tight connection with the housing walls, the filter bags hang downwardly from the tube sheet and the parallel rows thereof extend between the front and rear walls of the housing, an inspection passage is provided through the dusty-air section transversely of the rows of filter bags, and one end wall of the filter assembly is provided with an access door aligned with the said inspection passage for entry and exit with respect thereto.
Claim 9
Dependent Claim
171 words
A dust filter assembly according to claim 1 wherein the rigid collar attached to the open end of a filter bag is a tubular member of a diameter at one end for telescopingly fitting within a filter bag for attachment thereto and of a diameter at its other end to fit within a tube sheet opening, said collar has a radial flange adjacent said other end and adapted to carry gasket means for sealing engagement with the margin of the tube sheet opening on the dusty-gas side thereof, said collar has a pair of oppositely-disposed radially-projecting lugs at its said other end for engaging the margin of the tube sheet opening on the clean-gas side thereof and locking said collar to the tube sheet, and diametrically-opposite notches are formed in the margin of the tube sheet opening for passage of said lugs from the dusty-air side to the clean-air side thereof, whereby upon rotation of the collar a bayonet joint connection is had between the said collar and the tube sheet.
Claim 10
Dependent Claim
76 words
A dust filter according to claim 6 wherein the margin of each tube sheet opening is provided with a pair of oppositely-disposed angularly-extending camming areas angularly spaced from the marginal notches for engagement by the radial lugs at the end of the rigid collar, said camming areas rising progressively from the plane of the clean-gas side of the tube sheet for drawing the collar flange tightly against the dusty-gas side of the tube sheet opening margin.
Claim 11
Dependent Claim
169 words
In a dust filtering apparatus having a tube sheet separating a dusty-gas section and a clean-gas sEction and having a plurality of openings each adapted for connection with the open end of a tubular filter bag extending from the tube sheet into the said dusty-gas section, a bag mounting collar comprising an open-ended cylindrical member adapted at one end for attachment of the open end of a filter bag and at the other end for entry into a tube sheet opening, said collar having a radial flange spaced from the said other end and of a width to engage the margin of the tube sheet opening from the dusty-gas side thereof, a radially-projecting lug at the said other end of the collar of a length to overlie the margin of the tube sheet opening on the clean-gas side thereof for forming a bayonet-connection therewith, said radial flange extending outwardly from said collar for mounting a compressible gasket engagable with the tube sheet to seal the margin of said opening.
Claim 12
Dependent Claim
169 words
In a dust filtering apparatus having a tube sheet separating a dusty-gas section and a clean-gas sEction and having a plurality of openings each adapted for connection with the open end of a tubular filter bag extending from the tube sheet into the said dusty-gas section, a bag mounting collar comprising an open-ended cylindrical member adapted at one end for attachment of the open end of a filter bag and at the other end for entry into a tube sheet opening, said collar having a radial flange spaced from the said other end and of a width to engage the margin of the tube sheet opening from the dusty-gas side thereof, a radially-projecting lug at the said other end of the collar of a length to overlie the margin of the tube sheet opening on the clean-gas side thereof for forming a bayonet-connection therewith, said radial flange extending outwardly from said collar for mounting a compressible gasket engagable with the tube sheet to seal the margin of said opening.
Claim 13
Dependent Claim
47 words
A dust filtering apparatus according to claim 8 wherein the said radial flange has a first portion extending from the collar for direct engagement with the margin of the tube sheet opening and a second portion projecting beyond the first portion for mounting the said compressible gasket.
Claim 14
Dependent Claim
62 words
A dust filtering apparatus according to claim 8 wherein the margin of each tube sheet opening is provided with a notch for passing the lug on said collar, and a lug-camming area rising progressively from the plane of the clean-gas side of the tube sheet is formed in the margin of each of said openings in angularly-spaced relation with the said notch.
Claim 15
Dependent Claim
33 words
A dust filtering apparatus according to claim 10 wherein a detent bar rising from the said plane of the tube sheet is formed at the start of the rise of the lug-camming area.
Claim 16
Dependent Claim
36 words
A dust filtering apparatus according to claim 8 wherein a pair of radially-projecting lugs is provided on the said collar, each lug being of a length to overlie the said margin of the tube sheet opening.
Claim 17
Dependent Claim
64 words
A dust filtering apparatus according to claim 12 wherein the margin of each tube sheet opening is provided with a pair of angularly-spaced notches for passing the lugs on said collar, and a lug-camming area rising progressively from the plane of the clean-gas side of the tube sheet is formed in the tube sheet margin of each opening in angularly-spaced relation with each notch.
Claim 18
Dependent Claim
33 words
A dust filtering apparatus according to claim 13 wherein each camming area reaches its maximum height from the said plane of the tube sheet at the same angular distance from the respective notch.
Claim 19
Dependent Claim
32 words
A dust filtering apparatus according to claim 13 wherein the said notches are on diametrically-opposite sides of each of the tube sheet openings and the lugs on said collar are diametrically opposed.
Claim 20
Dependent Claim
36 words
A dust filtering apparatus according to claim 15 wherein the camming areas on the margin of each tube sheet opening reach the same maximum height at an angular distance of about 90* from the respective notch.
References Cited (Backward Citations)
FR1289019A
Cited
US3394532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |