# US 9,751,030 B2 · Filter and filter element provided therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,751,030 B2 - Document ID: US9751030B2 - Status: Granted - Kind: B2 - Application number: 13/261,418 - Filed: 2011-03-02 - Published: 2013-02-28 - Granted: 2017-09-05 - Earliest claimed: 2010-03-04 - Assignees: Hydac Filtertechnik GmbH - Applicants: Micha Kreibig; Richard Eberle - Inventors: Micha Kreibig; Richard Eberle - Web page: https://patentgrep.com/patent/US9751030B2 ## CPC - F02M 37/42: Installation or removal of filters - B01D 29/23: arranged for outward flow filtration - B01D 35/005: {Filters specially adapted for use in internal-combustion engine lubrication or fuel systems} - B01D 35/153: Anti-leakage or anti-return valves - B01D 35/16: Cleaning-out devices {, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid} - B01D 35/30: Filter housing constructions - B01D 35/306: {Filter mounting adapter} - B01D 36/003: {Filters in combination with devices for the removal of liquids (B01D35/185 takes precedence)} - B01D 29/117: {arranged for outward flow filtration (B01D29/23, B01D29/35 take precedence)} - B01D 29/58: arranged concentrically or coaxially - B01D 2201/295: with projections extending in a radial outward direction, e.g. for use as a guide, spacing means - B01D 2201/305: Snap, latch or clip connecting means - B01D 2201/34: Seals or gaskets for filtering elements - B01D 2201/4007: Use of cam or ramp systems - B01D 2201/4084: Snap or Seeger ring connecting means - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - 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) ## Abstract A filter, in particular for fluids polluted by admixtures of water, such as diesel oil, includes a filter housing (1) receiving at least one filter element (9). During the filtering process, fluid can flow through the filter medium (11) from the outer unfiltered side (13) of the filter element into an inner filter cavity (17) forming the filtered side (19). A water passage (39) inside a pipe connector (35) of an end cap (23) forms a fluid path (51), which is separated from the other fluid path (55) that forms the connection between the inner filtered side (19) of the filter element (9) and a fluid outlet (37) of the housing (1) in the functional position of the filter element (9). The element receptacle (29) forms a through-passage (59) toward the water collecting chamber (31). Scaling assemblies (83, 87) located between the through-passage (59) and the pipe connection (35) of the end cap (23) delimit a connecting chamber (36) on the outside of the pipe connector (35). The connecting chamber connects the other fluid path (55) to the fluid outlet (37) of the housing (1). ## Claims ### Claim 1 A filter for oil contaminated with water impurities, comprising: a filter housing having an element retainer forming a fluid outlet leading out of said filter housing and a water collecting space, said element retainer being located above said water collecting space, said water collecting space being located on a bottom of said filter housing; at least one filter element accommodated in said filter housing and having a filter medium with an outer unfiltered side and an inner filtered side, said inner filtered side defining an inner filter cavity, fluid to be filtered passing from said outer unfiltered side through said filter medium into said inner filter cavity; a water separation device and a separation space for separated water in said inner filter cavity; an end cap enclosing lower ends of said water separation device, said separation space and said filter medium, said end cap having a pipe connector forming inside thereof a fluid passage for filtered fluid emerging from said inner filter cavity to said fluid outlet and a water passage at least partially surrounding said fluid passage and being open to said separation space, said pipe connector being secured on said element retainer, said water passage forming a first fluid path separate from a second fluid path, said second fluid path connecting said inner filtered side of said filter element and said fluid outlet of said filter housing in an operating position of said filter element, said element retainer forming a through channel to said water collecting space; and first and second seals located between said through channel and said pipe connector of said end cap and on an outside of said pipe connector forming a collecting space connecting said second fluid path to said fluid outlet of said filter housing. ### Claim 2 (depends on 1) A filter according to claim 1 wherein said end cap comprises an inner pipe body extending with an inlet end thereof into said inner filter cavity and being open on an outlet end thereof to said collecting space located on said outside of said pipe connector. ### Claim 3 (depends on 2) A filter according to claim 2 wherein said pipe connector of said end cap comprises a lower end open to said water collecting space and comprises free space between an outside of said inner pipe body and an inside of said pipe connector forming said first fluid passage from said separation space to said water collecting space. ### Claim 4 (depends on 2) A filter according to claim 2 wherein said pipe connector and said inner pipe body comprise ends facing an interior of said filter element and forming concentric outer and inner connecting rings, respectively, said outer connecting ring projecting into said separation space and having an outside adjoining a support tube inside said filter medium of said filter element, said inner connecting ring projecting into said inner filter cavity and adjoining on an outside thereof an inside of a hydrophobic screen forming a part of said water separation device and surrounding said inner filtered side. ### Claim 5 (depends on 4) A filter according to claim 4 wherein said inner pipe body comprises a T-shaped pipe having an axially extending inlet part discharging on said inner connecting ring and passing into a transverse channel forming two outlet ends, said outlet ends discharging on an outside of said pipe connector at two opposing points into said connecting space. ### Claim 6 (depends on 2) A filter element according to claim 2 wherein said pipe connector and said inner pipe body comprise ends facing an interior of said filter medium and forming concentric outer and inner connecting rings, respectively, said outer connecting ring projecting into said separation space and having an outside adjoining a support tube inside said filter medium, said inner connecting ring projecting into said inner filter cavity and adjoining on an outside thereof an inside of a hydrophobic screen forming a part of said water separation device and surrounding said inner filtered side. ### Claim 7 (depends on 6) A filter element according to claim 6 wherein said inner pipe body comprises a T-shaped pipe having an axially extending inlet part discharging on said inner connecting ring and passing into a transverse channel forming two outlet ends, said outlet ends discharging on an outside of said pipe connector at two opposing points. ### Claim 8 (depends on 1) A filter according to claim 1 wherein said first and second seals comprise first and second O-rings, respectively, received in first and second annular grooves, respectively, of said pipe connector. ### Claim 9 (depends on 8) A filter according to claim 8 wherein said end cap comprises an inner pipe body extending with an inlet end thereof into said inner filter cavity and being open on an outlet end thereof to said collecting space located on said outside of said pipe connector; said second O-ring seals between an outlet end of said inner pipe body and said water collecting space and is located near a lower free end of said pipe connector; and said first O-ring seals a top side of an intermediate bottom of said element retainer and a filtered side on said pipe connector and is located above said outlet end of said inner pipe body, said top side being on said outer unfiltered side. ### Claim 10 (depends on 8) A filter element according to claim 8 wherein said end cap comprises an inner pipe body extending with an inlet end thereof into said inner filter cavity and being open on an outlet end thereof to said collecting space located on said outside of said pipe connector; said second O-ring seals an outlet end of said inner pipe body and is located near a lower free end of said pipe connector; and said first O-ring seals a filtered side on said pipe connector and is located above said outlet end of said inner pipe body, said top side being on said outer unfiltered side. ### Claim 11 A filter element for oil contaminated with water impurities, comprising: a filter medium with an outer unfiltered side and an inner filtered side, said inner filtered side defining an inner filter cavity, fluid to be filtered passing from said outer unfiltered side through said filter medium into said inner filter cavity; a water separation device and a separation space for separated water in said inner filter cavity; an end cap enclosing lower ends of said water separation device, said separation space and said filter medium, said end cap having a pipe connector forming inside thereof a fluid passage for filtered fluid emerging from said inner filter cavity and a water passage at least partially surrounding said fluid passage and being open to said separation space, said pipe connector being securable on an element retainer located above a water collecting space in a filter housing, said water passage forming a first fluid path separate from a second fluid path, said second fluid path connecting said inner filtered side of said filter element and a fluid outlet of the filter housing in an operating position of said filter element. ### Claim 12 (depends on 11) A filter element according to claim 11 wherein a first seal and a second seals are located on an outside of said pipe connector forming a collecting space for connecting said second fluid path to the fluid outlet of the filter housing. ### Claim 13 (depends on 12) A filter element according to claim 12 wherein said first and second seals comprise first and second O-rings, respectively, received in first and second annual grooves, respectively, of said pipe connector. ### Claim 14 (depends on 12) A filter element according to claim 12 wherein said end cap comprises an inner pipe body extending with an inlet end thereof into said inner filter cavity and being open on an outlet end thereof to said collecting space located on said outside of said pipe connector. ### Claim 15 (depends on 14) A filter element according to claim 14 wherein said pipe connector of said end cap comprises a lower end that can open to the water collecting space and comprises free space between an outside of said inner pipe body and an inside of said pipe connector forming said first fluid passage from said separation space to the water collecting space.