US 5,562,746 AGranted

Air filter assembly for filtering air with particulate matter

AssigneeDonaldson Company, Inc.

InventorThomas D. Raether

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Abstract

An air filter assembly for filtering air with particulate matter therein is provided. The air filter assembly includes a housing having an air inlet and an air outlet, and a spacer wall separating the housing into a filtering chamber and a clean air chamber. The spacer wall includes a first air flow aperture therein. The assembly includes a filter element positioned in air flow communication with the first air flow aperture. The assembly also includes a Venturi element mounted in the spacer wall first air flow aperture. The Venturi element includes a bell-mouth-shaped end portion which projects into an inner clean air chamber of the first filter element. The assembly includes a pulse jet cleaning apparatus having a nozzle oriented to direct a pulse of air into the first Venturi element in a direction toward the first filter element.

Claims21

Dependent claims

An air filter assembly for filtering air with particulate matter therein;

said air filter assembly comprising:
(a) a housing including an air inlet and an air outlet;
said housing including a rigid spacer wall separating said housing into a filtering chamber and a clean air chamber;
said spacer wall including a first air flow aperture therein;
(b) a first filter element positioned in air flow communication with said first air flow aperture in said spacer wall;
said filter element including filter media defining a filter element inner clean air chamber;
(i) said first filter element being oriented with said filter inner clean air chamber in air flow communication with said spacer wall first air flow aperture;
(ii) said first filter element including a first end cap having a central aperture;
said filter media being embedded within said first end cap;
(c) a first Venturi element mounted in said spacer wall first air flow aperture;
said first Venturi element having a diffuser portion, a bell-mouth-shaped end portion and an arcuate throat portion interconnecting said diffuser portion and said bell-mouth-shaped portion;
said first Venturi element being mounted in said spacer wall with said bell-mouth-shaped portion positioned to project into said first filter element first end cap and said first filter element inner clean air chamber;
and
(d) a pulse-jet cleaning apparatus including a first nozzle oriented to direct a pulse of air into said first Venturi element diffuser portion from said clean air chamber and toward said first filter element.

11 more elements

An air filter assembly for filtering air with particulate matter therein;

said air filter assembly comprising:
(a) a housing including an air inlet and an air outlet;
said housing including a rigid spacer wall separating said housing into a filtering chamber and a clean air chamber;
said spacer wall including a first air flow aperture therein;
(b) a first filter element positioned in air flow communication with said first air flow aperture in said spacer wall;
said filter element including filter media defining a filter element inner clean air chamber;
(i) said first filter element being oriented with said filter inner clean air chamber in air flow communication with said spacer wall first air flow aperture;
(ii) said first filter element including a first end cap having a central aperture;
said filter media being embedded within said first end cap;
and
(c) a first Venturi element mounted in said spacer wall first air flow aperture;
said first Venturi element having a diffuser portion, a bell-mouth-shaped end portion and an arcuate throat portion interconnecting said diffuser portion and said bell-mouth-shaped portion;
said first Venturi element being mounted in said spacer wall with said bell-mouth-shaped portion positioned to project into said first filter element inner clean air chamber;
(i) said first Venturi element diffuser portion having an open end with a first radius;
(ii) said first Venturi element being positioned with said diffuser portion open end positioned in said housing clean air chamber;
(iii) said Venturi element throat portion has a circular configuration with a second radius;
(iv) a ratio of said first radius to said second radius being within the range of 1.02:1 to 1.3:1.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/534,323Filed 27 Sep 1995 · continuation
Priority: 11 Apr 1994
Granted: 8 Oct 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B01D 46/2411
Characterised by the physical shape or structure of the filtering element: filter cartridges
B01D 46/0005
Casings; Housings; Frame constructions: mounting of filtering elements within casings, housings or frames
B01D 46/4281
Auxiliary equipment or operation thereof: venturi's or systems showing a venturi effect
B01D 46/48
Auxiliary equipment or operation thereof: removing dust other than cleaning filters , e.g. by using collecting trays