Patent US3891418A successfully refreshed from Google Patents.
US3891418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas filter
Assignee: Georg Fischer AG
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Filing: 1973-12-06
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Granted: 1975-06-24
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Expires: 1993-12-06
Abstract
Abstract In a filter for removing dust and the like from a gas, such as air, a filter element is connected at one end to an axially extending outlet sleeve and a guide sleeve is positioned coaxial with and radially inwardly from the outlet sleeve. A flushing gas nozzle is positioned to introduce gas into the outlet sleeve for flow into the filter element. The smallest transverse crosssectional area of the outlet sleeve is at least equal to the cross-sectional area of the filter element at the location of the connection of the filter element and outlet sleeve. The guide sleeve has a tapered shape in its axial direction and its walls diverge first outwardly from the outlet from the filter element to a transverse plane intermediate its ends and then converge from that plane to its opposite end. The outlet sleeve and guide sleeve have the same transverse cross-sectional shape which may be round, rectangular, or other closed shape. Equally spaced holes are formed in the guide sleeve in its diverging section from the filter element to afford communication between the interior of the guide sleeve and the space between the guide sleeve and the outlet sleeves. The holes can be arranged in one or a number of transverse planes.
Inventors
- 👤 Hans Burger
- 👤 Hans Riester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:33
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/42; B01D46/4281; B01D46/66; B01D46/70; B01D46/71; B01D2275/00; B01D2275/20; B01D2275/206
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
242 words
A gas filter with at least one filter element having an outlet, a clean gas outlet sleeve connected to said outlet of said filter element extending axially of said filter element, a flushing gas device with at least one flushing gas nozzle arranged above said outlet sleeve to introduce a pressurized back flushing gas surge through said outlet sleeve into said outlet of said filter element for cleaning it, wherein the improvement comprises that the smallest cross section of said sleeve transversely of its axis is at least equal to the flow cross section at the connection of said sleeve to said filter element, a hollow guide sleeve positioned within and extending in the axial direction of said outlet sleeve, said guide sleeve spaced radially inwardly from said outlet sleeve and dividing the interior of said outlet sleeve into an annular outer space and a central inner space, said guide sleeve having a first opening at one end directed toward said filter element and a second opening at its opposite end directed toward said flushing gas nozzle, said guide sleeve having a cross-sectional shape normal to its axis corresponding to the cross-sectional shape of said filter element, the transverse cross section of said guide sleeve varying between said first and second openings, and said guide sleeve having at least one other opening therethrough intermediate its ends and affording communication between the inner space and the annular outer space within said outlet sleeve.
Claim 2
Dependent Claim
242 words
A gas filter with at least one filter element having an outlet, a clean gas outlet sleeve connected to said outlet of said filter element extending axially of said filter element, a flushing gas device with at least one flushing gas nozzle arranged above said outlet sleeve to introduce a pressurized back flushing gas surge through said outlet sleeve into said outlet of said filter element for cleaning it, wherein the improvement comprises that the smallest cross section of said sleeve transversely of its axis is at least equal to the flow cross section at the connection of said sleeve to said filter element, a hollow guide sleeve positioned within and extending in the axial direction of said outlet sleeve, said guide sleeve spaced radially inwardly from said outlet sleeve and dividing the interior of said outlet sleeve into an annular outer space and a central inner space, said guide sleeve having a first opening at one end directed toward said filter element and a second opening at its opposite end directed toward said flushing gas nozzle, said guide sleeve having a cross-sectional shape normal to its axis corresponding to the cross-sectional shape of said filter element, the transverse cross section of said guide sleeve varying between said first and second openings, and said guide sleeve having at least one other opening therethrough intermediate its ends and affording communication between the inner space and the annular outer space within said outlet sleeve.
Claim 3
Dependent Claim
27 words
A gas filter, as set forth in claim 1, wherein said guide sleeve has an axial length substantially equal to the axial length of said outlet sleeve.
Claim 4
Dependent Claim
31 words
A gas filter, as set forth in claim 1, wherein said outlet sleeve and guide sleeve are coaxially arranged and are circular in cross section transverse to their common central axis.
Claim 5
Dependent Claim
31 words
A gas filter, as set forth in claim 1, wherein said outlet sleeve and guide sleeve are coaxially arranged and are elliptical in cross section transverse to their common central axis.
Claim 6
Dependent Claim
31 words
A gas filter, as set forth in claim 1, wherein said outlet sleeve and guide sleeve are coaxially arranged and are rectangular in cross section transverse to their common central axis.
Claim 7
Dependent Claim
31 words
A gas filter, as set forth in claim 1, wherein said outlet sleeve and guide sleeve are coaxially arranged and are square in cross section transverse to their common central axis.
Claim 8
Dependent Claim
69 words
A gas filter, as set forth in claim 1, wherein said guide sleeve has the form of a truncated double cone with the maximum transverse cross-sectional area of said double cone located in a plane intermediate the first and second openings of said guide sleeve and said double cone tapering inwardly from the plane of maximum transverse cross section to the first and second openings in said guide sleeve.
Claim 9
Dependent Claim
18 words
A gas filter, as set forth in claim 1, wherein said guide sleeve is oval-shaped in axial section.
Claim 10
Dependent Claim
18 words
A gas filter, as set forth in claim 1, wherein said guide sleeve is drop-shaped in axial section.
Claim 11
Dependent Claim
25 words
A gas filter, as set forth in claim 1, wherein said guide sleeve is in the shape of a truncated double pyramid in axial section.
Claim 12
Dependent Claim
20 words
A gas filter, as set forth in claim 1, wherein said guide sleeve is detachably connected to said outlet sleeve.
Claim 13
Dependent Claim
25 words
A gas filter, as set forth in claim 1, wherein the end of said outlet sleeve spaced upwardly from said filter element is curved outwardly.
Claim 14
Dependent Claim
25 words
A gas filter, as set forth in claim 1, wherein the cross section of said first opening is larger than that of said second opening.
Claim 15
Dependent Claim
111 words
A gas filter, as set forth in claim 1, comprising a plurality of filter elements and outlet sleeves arranged to form a plurality of filter elements-outlet sleeve combinations, a vertically arranged housing laterally enclosing said filter elements and outlet sleeves, an outwardly arranged partition extending transversely within said housing and intersecting said filter element outlet sleeve combinations intermediate therein, said partition dividing the space within said housing into a lower dust gas space and an upper clean gas space, said flushing gas device located above the upper ends of each of said outlet sleeve combinations within the clean gas space, and means for withdrawing clean gas from the clean gas space.
Claim 16
Dependent Claim
55 words
A gas filter, as set forth in claim 1, wherein said guide sleeve has a maximum cross-sectional area transverse to its axial direction in a plane intermediate its first and second openings and said at least one other opening therethrough is located between the plane of the maximum transverse cross-sectional area and said first opening.
Claim 17
Dependent Claim
41 words
A gas filter, as set forth in claim 15, wherein said at least one other opening through said guide sleeve comprises a number of equally spaced openings located in the same plane extending transversely of the axis of said guide sleeve.
Claim 18
Dependent Claim
41 words
A gas filter, as set forth in claim 15, wherein said at least one other opening through said guide sleeve comprises a number of equally spaced openings in a number of planes extending transversely of the axis of said guide sleeve.
Claim 19
Dependent Claim
27 words
A gas filter, as set forth in claim 15, wherein said at least one other opening through said guide sleeve comprises at least one circumferentially extending slot.
Claim 20
Dependent Claim
54 words
A gas filter, as set forth in claim 1, wherein a number of angularly spaced flat straps are connected to and extend between said outlet sleeve and said guide sleeve for supporting the guide sleeve from said outlet sleeve, as well as extending at least partially in the axial direction of said outlet sleeve.
Claim 21
Dependent Claim
32 words
A gas filter, as set forth in claim 19, wherein said flat straps are twisted about their axes for imparting a twist to the gas flow passing through said annular outer space.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |