# US 10,307,701 B2 · Filter element of a filter, heating cage for a filter element and a method for producing a filter element

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- Number: US 10,307,701 B2
- Document ID: US10307701B2
- Status: Granted
- Kind: B2
- Application number: 14/748,665
- Filed: 2015-06-24
- Published: 2015-12-31
- Granted: 2019-06-04
- Earliest claimed: 2014-06-27
- Assignees: Mann+Hummel GmbH
- Applicants: Mann+Hummel GmbH
- Inventors: Martin Klein
- Web page: https://patentgrep.com/patent/US10307701B2

## CPC

- B01D 35/18: Heating or cooling the filters
- B01D 29/21: with corrugated, folded or wound sheets
- B01D 46/2414: {End caps including additional functions or special forms}
- B01D 46/4263: {Means for active heating or cooling}
- B01D 46/521: {using folded, pleated material}
- H05B 3/0014: {Devices wherein the heating current flows through particular resistances}
- H05B 3/06: Heater elements structurally combined with coupling elements or holders
- B01D 2201/0423: not in the inner side of the cylindrical filtering elements
- B01D 2265/06: Details of supporting structures for filtering material, e.g. cores
- B29L 2031/14: Filters {(optical filters B29L2011/0066, sieves or screens B29L2031/737)}
- 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)
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

A filter element (10) of a filter for fluid and a method for producing a filter element (10) are described. The filter element (10) has a filter medium (14) which is designed as a hollow body (12) and is closed at the periphery, at least with respect to an element axis (16). The filter medium (14) is enclosed on at least part of its periphery and at least part of its axis by an electric heating jacket (26). The heating jacket (26) is arranged in or on a fluid-permeable supporting hollow body (24). The supporting hollow body (24) is open or can be opened, at least in an initial assembly of the filter element (10) on at least one peripheral side for arrangement on the filter medium hollow body (12).

## Claims

### Claim 1

A filter element of a filter for fluid, comprising
a filter medium formed as a filter medium hollow body which is circumferentially closed about a central element axis of the filter element;
an electric heating jacket arranged on a radially outer periphery of the filter medium hollow body, the electric heating jacket enclosed on at least part of the radially outer periphery of the hollow body and elongated in the direction of the element axis;
a fluid-permeable supporting hollow body formed as a heating cage circumferentially enclosing the radially outer periphery of the filter medium hollow body and extends along a portion of the element axis;
wherein the electric heating jacket is arranged in or arranged on a radially inner side of the fluid-permeable supporting hollow body;
wherein the supporting hollow body has at least two supporting body shells, each forming a separate portion of a radially outer circumference of the supporting hollow body, the at least two supporting body shells closable together and engage together, so as to circumferentially close the supporting hollow body about the radially outer periphery of the filter medium hollow body;
wherein the at least two supporting body shells, when closed together, are detachably engaged such that the fluid-permeable supporting hollow body can later be opened for removal or replacement of the filter medium hollow body or the electric heating jacket, and then the at least two supporting body shells closed together and engaged together to circumferentially close about the radially outer periphery of the filter medium hollow body.

### Claim 2 (depends on 1)

The filter element according to claim 1, wherein
the heating jacket is connected to an electrical connecting plug having a plug housing and contact pins therein for connection to electric lines to supply power to the electric heating jacket.

### Claim 3 (depends on 1)

The filter element according to claim 1, wherein
the heating jacket is arranged between a peripheral side of the filter element hollow body and a peripheral side of the supporting hollow body.

### Claim 4 (depends on 1)

The filter element according claim 1, wherein
the at least two supporting body shells are connected to one another by a flexible hinge member.

### Claim 5 (depends on 4)

The filter element according to claim 4, wherein
the at least two supporting body shells are connected to one another by means of at least one connection which is initially open and can be closed for closing the supporting hollow body on the periphery.

### Claim 6 (depends on 1)

The filter element according to claim 1, wherein
the at least two supporting body shells are joined to one another by a pivotable or movable connection on a peripheral side and the supporting body shells can be pivoted toward one another about the pivotable or movable connection to peripherally enclose the supporting hollow body.

### Claim 7 (depends on 6)

The filter element according to claim 6, wherein
the heating jacket has at least two jacket sections, each of the at least two jacket section extending over a portion of the periphery and each being arranged in or directly on a corresponding supporting body shell, such that the at least two jacket sections of the heating jacket can open and close with the at least two supporting body shells.

### Claim 8

A heating cage for at least partially peripheral and at least partially axial enclosure of a filter medium of a filter element, comprising
a fluid-permeable supporting hollow body;
a circumferentially closable electric heating jacket for circumferentially surrounding and at least partially axially enclosing a filter medium hollow body of a filter element;
wherein the electric heating jacket is arranged on a radially inner side of the fluid-permeable supporting hollow body of the heating cage;
wherein the supporting hollow body has at least two supporting body shells, each forming a separate portion of a radially outer circumference of the supporting hollow body, the at least two supporting body shells closing together and engaging together, so as to circumferentially close about the supporting hollow body;
wherein the at least two supporting body shells, when closed together, are detachably engaged such that the fluid-permeable supporting hollow body can later be opened for removal or replacement of the filter medium hollow body or the electric heating jacket, and then the at least two supporting body shells closed together and engaged together to circumferentially close over the filter medium hollow body.

### Claim 9 (depends on 8)

The heating cage according to claim 8, wherein
the supporting hollow body has at least two supporting body shells, each of the at least two supporting body shells extending circumferentially over at least a portion of the radial outer periphery of the supporting hollow body;
wherein the at least two supporting body shells are connected to one another by a pivotable or movable connection on a peripheral side, and the supporting body shells can be pivoted toward one another about the pivotable or movable connection to peripherally enclose the supporting hollow body.