# US 4,235,611 A · Air filter

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,235,611 A
- Document ID: US4235611A
- Status: Granted
- Kind: A
- Application number: 06/032,084
- Filed: 1979-04-23
- Granted: 1980-11-25
- Earliest claimed: 1979-04-23
- Assignees: Fram Corporation
- Inventors: Peter Brownell
- Web page: https://patentgrep.com/patent/US4235611A

## CPC

- B01D 46/521: {using folded, pleated material}
- B01D 46/2411: {Filter cartridges}
- B01D 50/20: Combinations of devices covered by groups B01D45/00 and B01D46/00
- F02M 35/02: Air cleaners
- B01D 2267/40: Different types of filters
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

A heavy duty automotive air cleaner for use in environments having high contaminant concentrations includes a housing carrying a vane-type centrifugal separator and a removable filter cartridge. The removable filter cartridge includes a pleated paper filtering medium and a fibrous, depth-type filtering medium. A pair of flow paths are defined through the housing between the inlet and outlet thereof. One of the flow paths extends through the depth-type media and the pleated paper medium, and the other flow path extends through the centrifugal vane-type separator and the pleated paper medium. The depth-type fibrous medium is placed upstream from the pleated paper medium, and is adapted to remove relatively fine particles from the incoming air stream as the heavier particles are centrifuged outwardly by the vane-type separator.

## Claims

### Claim 1

In an air filter, a housing defining a chamber therewithin, an annular filter cartridge in said chamber having a circumferentially extending permeable outer wall cooperating with the wall of the housing to define an annular inlet compartment therebetween within said chamber, inlet means for communicating air into said inlet compartment, said annular filter cartridge defining an outlet compartment, outlet means for communicating air from said outlet compartment after the air has passed through said filter cartridge, means in said inlet compartment circumscribing said permeable outer wall of said cartridge and extending transversely across said inlet chamber between the wall of the housing and said permeable outer wall for inducing a spiral flow component to at least a portion of the air communicated through said inlet and dividing said inlet compartment into one section upstream from said spiral flow inducing means and another section downstream from said spiral flow inducing means, said inlet communicating with said upstream section, said filter cartridge including a first filtering medium for filtering larger particles from the air communicated to said housing and a second filtering medium separate from said filtering medium for filtering finer particles from the air communicated to said housing, said second filtering medium being carried on said permeable outer wall of said filter cartridge, said upstream section and said first and second filtering media defining a first flow path between said inlet and outlet, said upstream section, said spiral flow inducing means, said downstream section, and at least one of said filtering media defining a second flow path between said inlet and outlet in parallel with said first flow path.

### Claim 2 (depends on 1)

The invention of claim 1:
where said spiral flow inducing means comprises a circumferentially extending array of turning vanes.

### Claim 3 (depends on 1)

The invention of claim 1:
wherein said annular filter cartridge comprises an inner screen defining said outlet compartment, said permeable outer wall being an outer screen cooperating with said housing to define said inlet compartment, said first filtering medium being pleated paper located between said screens.

### Claim 4 (depends on 3)

The invention of claim 3:
wherein the opposite ends of said upstream section of the inlet compartment are defined by the spiral flow inducing means and by a corresponding end of the housing, and said second filtering medium extends continuously on said outer screen between said corresponding end and said spiral flow inducing means.

### Claim 5 (depends on 4)

The invention of claim 4:
wherein said first flow path closes and substantially all of the air communicates through said second flow path when the pressure drop across said second filtering medium exceeds the pressure drop through said spiral flow inducing means so that thereafter substantially all of the air is communicated through the second flow path.

### Claim 6 (depends on 5)

The invention of claim 5:
wherein said pleated paper is located on one side of said outer screen and a portion of the pleated paper faces said second filtering medium mounted on the other side of said outer screen, said pleated paper defining flow channels between said pleats whereby air communicated through said second flow path communicates to said portion of the pleated paper facing said second filtering medium after said first flow path closes.