DRUM FILTER

• US 3,596,442 A
• Filed: 06/23/1969
• Issued: 08/03/1971
• Est. Priority Date: 06/22/1968
• Status: Expired due to Term

• Current Assignee: Neumann Gerhard Max
• Original Assignee: Neumann Gerhard Max
• Inventors: NEUMANN GERHARD MAX
• Application Number:
  US04/835,543
• Time in Patent Office: 771 Days
• US Class Current: 55/354
• CPC Class Codes: B01D 46/02 Particle separators, e.g. dust precipitators, having hollow filters made of flexible material

Abstract

A drum filter for filtering a stream of gas, comprising a boxlike casing which can be connected in horizontal and/or vertical juxtaposition with other like casings, a drum having a gas-permeable circumferential surface adapted to be enveloped at least partially by a travelling filter cloth drawn from an idler spool and wound on a driven spool, the spools each being mounted in a spool chamber and being rotatable about axes parallel to the axis of the drum, the spool chambers each having at least one hinged access door disposed in a plane parallel to the axis of the drum, a gas entry in one side of the casing and a gas exit in another side of the casing, the location of the entry and exit being chosen according to the desired direction of flow of the gas stream through the casing and filter and the construction being such that the gas stream can enter the casing either radially or axially of the drum dependent upon the location of said entry.

Claims

1. Apparatus for supporting a filter band for the filtration of a stream of gas, comprising a. a rectangular section boxlike casing adapted for connection in horizontal or vertical juxtaposition with other like casings;

b. a drum in said casing, said drum having at least one closed end and having a gas-permeable peripheral wall enveloped at least partially by a filter band;

c. means for supporting for rotation about an axis parallel to the axis of the drum a spool of fresh filter band;

d. means for supporting for rotation about an axis parallel to the axis of the drum a takeup spool for the used filter band;

e. means for driving said takeup spool;

f. a first spool chamber defined by sidewalls containing one of said spools and a second chamber defined by sidewalls containing the other of said spools;

g. said chambers are disposed at one side of said drum and each include sidewalls carrying a filter-band deflecting roller;

h. said chambers have openings for the filter cloth and said deflecting rollers are mounted in said openings so that the flow of gas to be filtered is substantially excluded from said chambers;

i. said chambers each have at least one access door hinged about an axis parallel to the axis of the drum;

j. the casing has an entry side and an exit opposite side for the gas stream;

k. the entry and exit sides are opposite one another and means for passing gas from the entry side to the exit side through the filter band and drum.

2. A drum filter according to claim 1, wherein said spool chambers are spaced from one another at one side of said casing and said exit is defined therebetween.

3. A drum filter according to claim 2, wherein the walls of said spool chambers defining said exit diverge at least in part towards the downstream end of said exit.

4. A drum filter according to claim 2, wherein said entry is in that side of the casing opposite said exit and said drum is closed at both ends so that the gas stream enters the casing in a direction normal to the axis of the drum.

5. A drum filter according to claim 1, wherein said drum is supported at its ends on inwardly directed annular flanges of two angle-section rings attached to the casing.

6. A drum filter according to claim 5, wherein the drum is a stationary drum and is tightly fitted to said angle-section rings.

7. A drum filter according to claim 5, wherein said angle-section rings are provided with annular shoulders on which side margins of the filter cloth can ride.

8. A drum filter according to claim 5, wherein the drum is rotatable about its axis.

9. A drum filter according to claim 8, wherein the drum is mounted for rotation on balls or rollers which ride on said annular flanges.

10. A drum filter according to claim 1, wherein the drum is provided with diametrical stays and is rotatably mounted on at least one axle pin carried by the casing.

11. A drum filter according to claim 10, wherein annular flanges are provided in said casing with which the filter cloth is adapted to make sealing contact.

12. A drum filter according to claim 1, wherein the casing is provided with means whereby it can be connected to the casing of a similar filter or filters.

13. A drum filter according to claim 12, wherein said means comprises at least one flange.

14. A drum filter according to claim 13, wherein fixing holes are provided in said flange.

15. A drum filter according to claim 1, wherein a square section shaft is provided for said driven spool, said square section shaft being capable of being coupled by a push-in socket joint to the corresponding shaft of an adjacent drum filter.

16. A drum filter according to claim 1, comprising at least one fan for increasing the pressure of the gas through the filter.

17. A drum filter according to claim 16, wherein at least one cross flow fan is provided in said exit.

18. A drum filter according to claim 16, wherein the drum is a stationary drum and at least one fan is mounted within the drum.

19. A drum filter for the filtration of a stream of gas, comprising a boxlike casing adapted for connection in horizontal or vertical juxtaposition with other like casings, a drum in said casing, a first spool of filter cloth and a second takeup spool, said drum having closed ends and having a gas-permeable peripheral wall partially enveloped by the filter cloth drawn from the first spool and wound on the second spool, means for driving the second spool, said spools being rotatable about axes parallel to the axis of the drum, a chamber defined by sidewalls and containing said first spool and a second chamber defined by sidewalls and containing said second spool, the said chambers being spaced from one another at one side of said casing and each having at least one hinged access door hingeable about an axis parallel to the axis of the drum, a filter cloth deflecting roller associated with each said chamber adjustable to maintain a filter cloth tightly against said drum and to make sealing contact with a wall of its chamber substantially to close said chamber, a gas exit defined by sidewalls of said spaced chambers, the sidewalls defining the exit diverging outwardly at least at the downstream end of said exit, and a gas entry in that side of the casing opposite said gas exit, and means for passing a gas stream from the entry to the exit through the filter band radially of said drum.

20. A drum filter for the filtration of a stream of gas, comprising a casing consisting of a rectangular section duct, a drum in said duct, a first spool of filter cloth and a second takeup spool, said drum being arranged with its axis normal to the direction of gas flow through said duct, said drum having closed ends and having a gas-permeable peripheral wall partially enveloped by the filter cloth drawn from the first said spool and wound on the second spool, means for driving said second spool, said spools being rotatable about axes parallel to the axis of the drum, a spool chamber defined by sidewalls and containing the first said spool and a second chamber defined by sidewalls and containing second said spool, the said chambers being spaced from one another on the downstream side of said drum and each having a hinged access door hingeable about an axis parallel to the axis of the drum, a filter cloth deflecting roller associated with each said chamber adjustable to maintain a filter cloth tightly against said drum and to make sealing contact with a wall of its chamber, and inlet in the duct and on one side of the drum and a gas exit from said duct and said drum filter, on the opposite side of the drum said gas exit being defined by sidewalls of said spaced chambers.

21. A drum filter for the filtration of a stream of gas, comprising a boxlike casing adapted for connection in horizontal or vertical juxtaposition with other like casings, a drum in said casing, a first spool of filter cloth and a second takeup spool, said drum being closed at one end and having a gas-permeable peripheral wall enveloped by the filter cloth drawn from the first spool and wound on the second spool, means for driving said second spool, said spools being rotatable about axis parallel to the axis of the drum, a chamber defined by sidewalls and containing the first said spool and a second chamber defined by sidewalls and containing the second said spool, the said chambers being in close juxtaposition and each having at least one hinged access door hingeable about an axis parallel to the axis of the drum, a filter cloth deflecting roller associated with each said chamber, said deflecting rollers being in close adjacence and each being adjustable to maintain a filter cloth tightly against said drum and to make sealing contact with a wall of its chamber, a gas entry and a gas exit in opposite walls of said casing adjacent the ends of said drum and means for passing gas from said entry to the exit through the filter band axially of the drum.

22. A drum filter according to claim 21, wherein the filter cloth deflecting rollers are in close adjacence, said drum is closed at one end only, and said entry and exit are so located that the gas stream enters and leaves the casing in the direction of the drum axis.