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WO2021052746A1 - Filtre à liquide - Google Patents

Filtre à liquide Download PDF

Info

Publication number
WO2021052746A1
WO2021052746A1 PCT/EP2020/074334 EP2020074334W WO2021052746A1 WO 2021052746 A1 WO2021052746 A1 WO 2021052746A1 EP 2020074334 W EP2020074334 W EP 2020074334W WO 2021052746 A1 WO2021052746 A1 WO 2021052746A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
filter insert
liquid
insert
display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2020/074334
Other languages
German (de)
English (en)
Inventor
Jürgen HÖLKER
Markus LÜERSMANN
Christian Vinkelau
Eike DR. STITTERICH
Arno Heinen
Mark VON LÜTZAU
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hengst SE and Co KG
Original Assignee
Hengst SE and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hengst SE and Co KG filed Critical Hengst SE and Co KG
Publication of WO2021052746A1 publication Critical patent/WO2021052746A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
    • B01D35/143—Filter condition indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
    • B01D29/606—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by pressure measuring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/003—Filters in combination with devices for the removal of liquids
    • B01D36/005—Liquid level sensing means, e.g. for water in gasoil-filters

Definitions

  • the invention relates to a liquid filter with a filter housing and a filter insert, which is arranged axially movable within the filter housing and has filter material, the filter material being able to be flowed through by a liquid to be filtered from a raw side to a clean side of the liquid filter.
  • the filter material of a filter insert experiences aging with increasing service life, which can be attributed in particular to the contamination of the filter material. For this reason, liquid filters have hitherto been regularly serviced, with the filter insert having to be replaced or the filter material of the filter insert cleaned as part of the maintenance. If the required maintenance is not carried out or is carried out incorrectly, the liquid throughput through the liquid filter can be significantly impaired, for example.
  • Liquid filter known with a wear indicator, in which a user can read the state of wear on the liquid filter.
  • a liquid filter is known in which an axial movement of the filter insert is triggered by an increase in pressure on the raw side of the liquid filter. The axial movement of the filter insert is due to the pressure difference between the liquid pressure on the raw side and the ambient pressure.
  • Clean side is not taken into account when determining the degree of contamination of the filter insert.
  • the object on which the invention is based is therefore to provide a liquid filter in which the aging or the state of contamination of the filter material can be monitored via an axial movement of the filter insert, with both the pressure on the raw side and the pressure on the clean side of the Liquid filter is taken into account.
  • Liquid filter can be caused by a pressure difference between the raw side and the clean side.
  • the invention makes use of the knowledge that the pressure difference between the raw side and the clean side due to a decreasing permeability of the filter material with increasing contamination of the
  • Filter material increases. Via the axial movement of the, which is dependent on the pressure difference between the raw side and the clean side of the liquid filter
  • the filter insert With the filter insert, the aging or soiling of the filter material can be monitored. As a result of the monitoring, the filter insert can be used until the end of its service life, so that replacing the filter insert too early is effectively avoided. By utilizing the entire service life of the filter insert, the maintenance costs of commercial vehicles can be reduced considerably. In addition, flexible maintenance intervals that are adapted to the level of contamination can be implemented.
  • the liquid filter according to the invention is thus designed in such a way that when the differential pressure increases between the raw side and the clean side, the filter insert is moved out of its rest position in the axial direction.
  • the filter insert has, for example, two opposite end disks, the filter material being arranged between the end disks. Due to the pressure difference between the raw side and the clean side of the liquid filter, there are axial forces on the end plates, which are oriented in opposite directions. Since an end disk has a discharge opening for the filtered liquid on the clean side, the axial forces acting on the end disks differ so that they do not cancel out or compensate one another.
  • the discharge opening is located, for example, in the inner dome area of an end disk.
  • the liquid filter can be, for example, a fuel filter or an oil filter of a vehicle, in particular a commercial vehicle.
  • the liquid filter according to the invention has a spring element which counteracts the axial movement of the filter insert.
  • the spring element can preferably be compressed and / or extended apart by an axial movement of the filter insert.
  • the spring element is, for example, a helical spring.
  • the spring element is preferably arranged in the filter housing of the liquid filter.
  • the spring element absorbs the axial force acting on the filter insert, so that an axial deflection of the filter insert that is dependent on the spring properties and the pressure difference between the raw side and the clean side is implemented.
  • the degree of contamination of the filter material and thus the state of aging of the filter insert can be determined from the extent of the axial deflection of the filter insert.
  • a small axial deflection of the filter insert indicates a low level of contamination of the filter material.
  • a strong axial deflection of the filter insert indicates that the filter material is very dirty.
  • the liquid filter according to the invention has a detection device, in particular an electrical one, by means of which a position and / or the axial movement of the filter insert can be detected and / or determined.
  • the detection device can comprise a proximity sensor or a distance sensor, by means of which the approach of the filter insert or the distance to the filter insert can be detected and / or determined.
  • the position and / or the axial movement of the filter insert can be detected capacitively and / or inductively by the detection device, for example.
  • the detection device can be set up, for example, to detect a change position of the filter insert, which indicates a state of contamination which makes it necessary to change the filter insert. Changing a filter element is usually necessary when the filter element has reached an end-of-lifetime status.
  • the change position of the filter insert can be an end position, so that no axial movement of the filter insert beyond the change position is possible.
  • the detection device can have a contacting mechanism by means of which an electrically conductive permanent contact is established when the filter insert assumes a specific position, for example the changing position.
  • An axial stop for the filter insert is preferably implemented by the contacting mechanism, so that no further axial displacement of the filter insert beyond the specific position is possible after the permanent contact has been established.
  • a liquid filter according to the invention which has a display device.
  • the state of contamination of the filter material based on the axial deflection of the filter insert can be optically displayed by means of the display device.
  • the display device of the liquid filter thus serves as an aging indicator for the filter insert. Since the axial deflection of the filter element depends on the pressure difference between the raw side and the clean side of the liquid filter, the contamination status of the filter material that can be visually indicated by the display device is also based on the pressure difference between the raw side and the clean side of the liquid filter.
  • the display device has a latching mechanism by means of which a contamination state remains optically displayed after a pressure difference between the raw side and the clean side has been resolved.
  • the pressure difference between the raw side and the clean side of the liquid filter is dissolved, for example, when the delivery of the liquid to be filtered is interrupted.
  • a corresponding interruption of the delivery occurs, for example, when a delivery pump is switched off, it being possible for the delivery pump to be switched off when an engine is switched off.
  • the contamination status can thus also be read off when the delivery of the liquid to be filtered is interrupted, for example because the engine of the vehicle in which the liquid filter is installed has been switched off.
  • the locking mechanism can have several locking steps. Maintaining the The contamination status is displayed in stages after the pressure difference between the raw side and the clean side has been resolved. Alternatively, the locking mechanism can also be designed continuously.
  • the display device has a visor body which is designed to cover a display body of the display device, the degree to which the display body is covered by the visor body is dependent on the axial deflection of the filter insert.
  • the visor body and the display body are therefore movable relative to one another in the axial direction.
  • the visor body and the display body preferably have different colors, so that the degree of obscuration of the display body by the visor body can be clearly perceived.
  • the diaphragm body is preferably designed as a sleeve diaphragm.
  • the display body is preferably designed as a colored display sleeve.
  • the diaphragm body, which is designed as a sleeve diaphragm, and the display body, which is designed as a display sleeve are preferably arranged coaxially to one another.
  • a liquid filter according to the invention is preferred in which the diaphragm body is coupled to the filter insert in such a way that the diaphragm body is moved in the axial direction by the filter insert when the filter insert is axially deflected.
  • the coupling of the diaphragm body and the filter insert preferably has an axial play which prevents the diaphragm body from moving back through the filter insert in the event of an opposing axial movement of the filter insert after a pressure difference between the raw side and the clean side has been resolved. If the pressure difference between the raw side and the clean side is dissolved, for example due to an interruption in the delivery of liquid, the filter insert moves back into its rest position, with the diaphragm body remaining in its axially deflected position.
  • the diaphragm body preferably has a sliding surface, in particular a circumferential sliding surface, on which a fastening section of the filter insert slides when the axial play is used.
  • the diaphragm body is attached, for example, to an end disk of the filter insert, the attachment being the axial play having.
  • the diaphragm body is preferably clipped into the filter insert. Alternatively, however, a different fastening or a panel formed in one piece on the filter insert is also possible.
  • the display body is attached, for example, to the filter housing of the liquid filter so that it cannot be deflected by an axial movement of the filter insert and / or the visor body. In another embodiment, the
  • Display body also axially movable and by an axial movement of the
  • the filter insert and / or the diaphragm body can be axially deflected.
  • the display body it is also possible for the display body to be attached to the filter insert and the diaphragm body to be attached to the filter housing. In this case, the display body is moved with the filter insert.
  • a diaphragm body can also be omitted or formed by the filter housing.
  • the visor body and the display body are components of the latching mechanism, the visor body and the display body having corresponding latching sections which can be brought into engagement in different locking stages via a relative movement of the visor body and the display body in the axial direction. Disengaging the latching sections requires increased effort so that a latching effect is implemented. If the pressure difference between the raw side and the clean side is dissolved, for example if the liquid feed is interrupted, the corresponding latching sections of the visor body and the display body remain in engagement, so that the degree of concealment that exists during operation even after the pressure difference between the raw side and the clean side has been dissolved is retained. If the filter insert needs to be changed, the increased effort required to disengage the latching sections can be applied manually to the visor body or the display body, so that the latching mechanism is manually reset to its original state, this state indicating an unpolluted filter material .
  • the display device comprises a viewing window in the filter housing which is the degree of obscuration of the display body by the visor body optically perceptible, in particular optically readable.
  • the degree of obscuration by the viewing window can preferably be visually perceived by a person from the outside. Markings can be arranged on the viewing window or in the vicinity of the viewing window, which mark different degrees of covering of the display body by the visor body. The contamination status of the filter material can then be read from the markings.
  • a liquid filter according to the invention which has a water separation device for separating water from the liquid.
  • the water separator has a
  • the filling level of the collecting chamber can be visually perceived, in particular optically read, via the viewing window.
  • the viewing window thus allows a combined display of the aging condition of the filter insert and the filling level of the collecting chamber.
  • the diaphragm body and / or the display body are preferably arranged in the collecting chamber. Markings which indicate different filling levels of the collecting chamber can be arranged on the viewing window or in the vicinity of the viewing window. The filling level of the collecting chamber can thus be read from the markings.
  • the display device has a temperature-dependent locking mechanism, by means of which a relative movement between the display body and the diaphragm body can be prevented when the filter insert is axially deflected.
  • a temperature-dependent locking mechanism by means of which a relative movement between the display body and the diaphragm body can be prevented when the filter insert is axially deflected.
  • the locking mechanism releases the relative movement between the display body and the diaphragm body again when the filter insert is axially deflected.
  • the function of the display device is thus restored as soon as the liquid to be filtered has reached an operating temperature.
  • the relative movement of the filter insert itself can also be prevented by a temperature-controlled locking mechanism at cold temperatures.
  • the display body is axially movable, the diaphragm body exerting a drag force on the display body when the filter insert is axially deflected and the display body is controlled by a temperature-controlled actuator, such as a retaining spring with temperature-dependent spring properties, an expansion element or a bimetal element , is held in a rest position until the entrainment force exceeds the holding force of the retaining spring holding the display body in the rest position.
  • the actuator is preferably a retaining spring and part of the temperature-dependent locking mechanism.
  • an axial deflection of the filter insert results either in a common axial deflection of the display body and the diaphragm body or in a relative movement of the display body and the diaphragm body in the axial direction. If there is a common axial movement of the display body and the visor body, the degree to which the display body is covered by the visor body is not changed. If there is a relative movement of the display body and the visor body in the axial direction, the degree to which the display body is covered by the visor body is changed. Whether there is a relative movement between the display body and the visor body is therefore dependent on the temperature of the retaining spring.
  • the axial movement of the display body and visor body during a cold start can thus be avoided, so that there is no false indication of the state of contamination and / or incorrect actuation of the locking mechanism due to the increased viscosity of the liquid to be filtered during a cold start.
  • An increase in the temperature of the liquid to be filtered leads to an increase in temperature at the retaining spring, so that the spring properties of the retaining spring are changed in such a way that a relative movement of the display body and the visor body in the axial direction is possible again.
  • a liquid filter according to the invention is advantageous in which the retaining spring is formed from a shape memory alloy.
  • the shape memory alloy is preferably austenitic.
  • the shape memory alloy is preferably martensitic.
  • the retaining spring is much more rigid than at low temperatures.
  • the retaining force of the retaining spring is therefore comparatively small.
  • the holding force of the holding spring is comparatively great.
  • a relative movement between the display body and the visor body is again possible in the axial direction.
  • a liquid filter according to the invention is also advantageous in which the display device has a locking body which is to be moved from a locked position into a release position in order to enable the filter insert to be coupled to the display device.
  • the filter insert preferably has an unlocking element, by means of which the blocking body can be moved from the blocking position into the release position.
  • Shoring protection is implemented via the blocking body, by means of which the installation of unsuitable filter inserts is prevented.
  • the locking body is acted upon by a return spring with a restoring force which holds the locking body in the locking position.
  • the return spring is designed to bring the locking body from the release position back into the locking position when the locking body has been deflected into the release position.
  • the unlocking element can be brought into abutment with the locking body during the coupling process, so that the locking body is moved from the locking position to the release position by the unlocking element during the coupling process and thus enables the filter insert to be coupled to the display device.
  • a liquid filter according to the invention is also advantageous in which the blocking body in the blocking position prevents elastic deformation of a material section of the display device by the filter insert, which is necessary for coupling the filter insert to the display device.
  • the blocking body is preferably located in the blocking position in an area which is required by the material section of the display device for deformation. As long as the locking body is in this area, deformation of the material section is therefore not possible.
  • the blocking body In the release position, the blocking body preferably releases the elastic deformation of the material section of the display device by the filter insert, which is necessary for coupling the filter insert to the display device. This is preferably done in that the area required for the deformation is no longer occupied by the blocking element.
  • FIG. 1 shows an embodiment of the liquid filter according to the invention in a perspective illustration
  • FIG. 2 shows a liquid filter according to the invention with a non-deflected filter insert in a lateral sectional illustration; 3 shows individual components of the liquid filter shown in FIG. 2 in a perspective exploded view;
  • FIG. 4 shows a section of the liquid filter depicted in FIG. 2 in a perspective sectional illustration
  • FIG. 5 shows a section of the liquid filter depicted in FIG. 2 in a lateral sectional illustration
  • FIG. 6 shows a section of the liquid filter depicted in FIG. 2 in a further lateral sectional illustration
  • FIG. 7 shows the liquid filter shown in FIG. 2 with an axially deflected filter insert in a lateral sectional illustration
  • FIG. 8 shows a section of the liquid filter depicted in FIG. 7 in a lateral sectional illustration
  • FIG. 9 shows a section of the liquid filter depicted in FIG. 7 in a further lateral sectional illustration
  • FIG. 10 shows a section of a liquid filter according to the invention with a locking mechanism in two different states during a cold start in a sectional side view
  • FIG. 11 shows a section of the liquid filter depicted in FIG. 10 in two different aging states in a lateral sectional illustration
  • FIG. 12 shows a partial area of a filter housing of a liquid filter according to the invention in a side view
  • FIG. 13 shows individual components of a liquid filter according to the invention with an installation protection in a first assembly state in a sectional illustration
  • FIG. 14 shows the parts of a liquid filter according to the invention shown in FIG. 13 in a second assembly state in a
  • FIG. 15 shows the parts of a liquid filter according to the invention shown in FIG. 13 in a third assembly state in a
  • Sectional view. 1 shows a liquid filter 10 designed as a fuel filter.
  • the liquid filter 10 comprises a filter housing 12, a filter insert 14 (covered) being arranged within the filter housing 12.
  • the filter housing 12 comprises an essentially cylindrical partial area 16a and a cup-shaped partial area 16b.
  • the sub-area 16a is screwed to a base 30.
  • the liquid filter 10 has a display device 18, by means of which the state of contamination of a filter material 34 of the filter insert 14 can be visually displayed.
  • the display device 18 thus serves as an aging indicator for the filter insert 14.
  • the display device 18 comprises a display body 22 and a visor body 24.
  • the visor body 24 is designed to cover the display body 22 depending on the soiling state of the filter material 34 of the filter insert 14. The degree to which the display body 22 is covered by the visor body 24 is therefore dependent on the state of aging of the filter insert 14.
  • the filter housing 12 there are viewing windows 20a, 20b.
  • the degree to which the display body 22 is covered by the visor body 24 can be optically read through the viewing windows 20a, 20b.
  • markings 78a-78d are arranged, which identify different degrees of covering of the display body 22 by the visor body 24. The state of contamination of the filter material 34 of the filter insert 14 can thus be read from the markings 78a-78d.
  • the liquid filter 10 has a water separating device for separating water from the liquid to be filtered, the water separating device having a collecting chamber 88 for the separated water.
  • the filling level of the collecting chamber 88 can be read optically through the viewing windows 20a, 20b. In the vicinity of the viewing window 20b, markings 26a-26c are arranged, which identify different filling levels of the collecting chamber 88. The filling level of the collecting chamber 88 can thus be read off via the markings 26a-26c.
  • An outlet opening of the filter housing 12 of the liquid filter 10 is closed by means of a closure element 28. The closure element 28 can be released to remove the water that has accumulated in the collection chamber 88.
  • the filter insert 14 is arranged within the filter housing 12.
  • the filter insert 14 can be moved axially within the filter housing 12 and has a filter material 34.
  • a liquid to be filtered can flow through the filter material 34 from a raw side 36 to a clean side 38 of the liquid filter 10.
  • An axial movement of the filter insert 14 is caused by a pressure difference between the raw side 36 and the clean side 38.
  • the pressure difference between the raw side 36 and the clean side 38 increases due to a decreasing permeability of the filter material 34 with increasing contamination of the filter material 34.
  • the filter insert 14 has a support structure 40, the support structure 40 comprising a lower end disk 44a and an upper end disk 44b.
  • An inner dome 42 of the support structure 40 is located between the end disks 44a, 44b.
  • the inner dome 42 is surrounded by the filter material 34, the filter material 34 being arranged between the end disks 44a, 44b. Due to the pressure difference between the raw side 36 and the clean side 38, axial forces are produced at the end disks 44a, 44b during operation of the liquid filter 10, which are oriented in opposite directions. Since the end plate 44b has a discharge opening for the filtered liquid on the clean side 38, the axial forces acting on the end plates 44a, 44b differ, so that there is no force compensation.
  • the discharge opening is located in the inner dome area of the end disk 44b and is connected to the outlet channels 58, 60.
  • a spring element 56 is arranged within the filter housing 12, which counteracts the axial movement of the filter insert 14.
  • the spring element 56 is by an upward movement of the Filter insert 14, which is caused by the pressure difference between the raw side 36 and the clean side 38 of the liquid filter 10, compressed.
  • the filter insert 14 is pushed back into the starting position by the spring element 56.
  • the filter insert 14 is in a rest position in which support elements 64a-64d, which are arranged on the end disk 44a, are in contact with a support surface 66.
  • the support surface 66 thus serves as an axial stop for the filter insert 14, which defines the rest position of the filter insert 14.
  • the spring element 56 absorbs the axial force acting on the filter insert 14, so that an axial deflection of the filter insert 14 dependent on the spring properties of the spring element 56 and the pressure difference between the raw side 36 and the clean side 38 is possible.
  • the extent of the axial deflection of the filter insert 14 is dependent on the degree of contamination of the filter material 34 and thus on the state of aging of the filter insert 14. When the filter material 34 is slightly soiled, there is no or only a slight axial deflection of the filter insert 14. When the filter material 34 is heavily soiled, there is a strong axial deflection of the filter insert 14.
  • the liquid filter 10 can be an electrical one, not shown
  • Have detection device by means of which it can be determined when the filter insert 14 assumes a change position. If the filter insert 14 is in the change position, this is an indication that a change of the filter insert 14 is necessary.
  • the change position is an upwardly deflected end position of the filter insert 14. If a water sensor 76 is provided in the liquid filter 10 (see below), the electrical detection device can advantageously be accommodated in its vicinity so that cabling can run adjacent.
  • 3 shows the display device 18 of the liquid filter 10 in detail. By means of the display device 18, an on the axial deflection of the The state of contamination of the filter material 34 based on the filter insert 14 can be visually displayed.
  • the display device 18 comprises a visor body 24 embodied as a sleeve visor and a visor body 22 embodied as a colored display sleeve 22.
  • the visor body 24 and the display body 22 are movable relative to one another in the axial direction and have different
  • the visor body 24 is designed to cover the display body 22, the degree to which the display body 22 is covered by the visor body 24 is dependent on the axial deflection of the filter insert 14.
  • the display body can also comprise several colors, so that different colors can be seen depending on the visibility of the body.
  • the diaphragm body 24 is attached to the end plate 44a.
  • the filter insert 14 has a fastening section 52, the screen body 24 being clipped into the fastening section 52 of the filter insert 14.
  • the screen body 24 has a sliding surface 50 on which the fastening section 52 of the filter insert 14 can slide.
  • the fastening section 52 has an inwardly directed material projection 90 which can be brought into engagement with an outwardly directed material projection 92 of the visor body 24.
  • the screen body 24 is coupled to the filter insert 14 via the material projections 90, 92 in such a way that the screen body 24 is moved in the axial direction by the filter insert 14 when the filter insert 14 is axially deflected, the coupling of the screen body 24 and the filter insert 14 having an axial play, which prevents the diaphragm body 24 from moving back through the filter insert 14 in the event of an opposing axial movement of the filter insert 14 after a pressure difference between the raw side 36 and the clean side 38 has been resolved.
  • the inwardly directed material projection 90 of the fastening section 52 slides along the sliding surface 50 of the visor body 24.
  • the display device 18 also has a latching mechanism 62a, 62b, by means of which a state of contamination continues to be displayed optically after a pressure difference has been triggered between the raw side 36 and the clean side 38 remains.
  • the state of contamination can also be read on the basis of the locking mechanism 62a, 62b when the delivery of the liquid to be filtered is interrupted, for example because the engine of the vehicle in which the liquid filter 10 is installed has been switched off.
  • the locking mechanism 62a, 62b has several locking steps. The multiple locking steps are implemented via multiple locking grooves running in the circumferential direction on the display body 22, the locking grooves being arranged axially spaced from one another.
  • the material projection 62b on the visor body 24 can be brought into engagement with and out of engagement with the different locking grooves 62a. Due to the locking mechanism 62a, 62b, the contamination status is displayed in stages. Different latching steps are set via a relative movement of the visor body 24 and the display body 22 in the axial direction. To disengage the latching sections of the visor body 24 and the display body 22, an increased expenditure of force is required, so that a latching effect is implemented.
  • the illustrations also show that the closure element 28 is screwed into a closure receptacle 46.
  • the closure receptacle 46 is in turn screwed into an inner shell 48.
  • the filter housing 12 is sealed off from the inner shell 48 by means of a circumferential O-ring seal 54.
  • the display body 22 is fastened to the closure receptacle 46 via a clip connection.
  • the visor body 24 On its inner tube, which has the material projection 62b, the visor body 24 has outwardly projecting wings, which form an end stop and prevent complete detachment of the visor body 24 from the display body 22.
  • the filter insert 14 Due to the contamination of the filter material 34, the permeability of the filter material 34 for the liquid to be filtered is reduced, which results in an increased pressure difference between the raw side 36 and the clean side 38. Due to the increase in differential pressure between the raw side 36 and the clean side 38, the filter insert 14 has been moved upward out of the rest position in the axial direction. Due to the axial deflection of the filter insert 14, the screen body 24 was carried along axially upwards by the filter insert 14, so that the degree to which the display body 22 was covered by the screen body 24 was reduced. As a result of the outward movement of the visor body 24, a lower section of the display body 22 is no longer covered. The concealment state can be read by a user through a viewing window 20a, 20b, so that a wear indicator based on the differential pressure change between the raw side 36 and the clean side 38 is implemented.
  • Display device 18 has a temperature-dependent locking mechanism 80.
  • the locking mechanism 80 prevents incorrect display of the
  • the locking mechanism 80 is set up to allow a relative movement between the display body 22 and the visor body 24 when there is
  • the cold start situation is shown in FIG. 10.
  • a cold start due to the temperature-related high viscosity of the liquid to be filtered, there is initially a comparatively high pressure difference between the raw side 36 and the clean side 38, so that an axial deflection of the filter insert 14 is caused.
  • the display body 22 is axially movable, the screen body 24 exerting a drag force on the display body 22 when the filter insert 14 is deflected.
  • the display body 22 is held in a rest position by a retaining spring 70 until the entrainment force exceeds the holding force of the retaining spring 70 which holds the display body 22 in the rest position.
  • the retaining spring 70 is positioned between a stationary or immovable contact surface 72 and a contact surface 74 arranged on the display body 22.
  • the retaining spring 70 is formed from a shape memory alloy and thus has temperature-dependent spring properties. In the cold start situation, i.e. at low
  • the holding force of the holding spring 70 is comparatively small.
  • the entrainment force which the diaphragm body 24 exerts on the display body 22 when the filter insert 14 is axially deflected is greater than the holding force of the retaining spring 70 at low temperatures
  • the retaining spring 70 is compressed. 11 shows an axial deflection of the filter insert 14 caused by wear.
  • the holding force of the holding spring 70 is comparatively large. At high temperatures, the display body 22 is consequently held in the rest position by the retaining spring 70, so that a relative movement between the display body 22 and the visor body 24 due to a
  • FIG. 12 shows a partial area 16b of a filter housing 12, within which a viewing window 20a is positioned.
  • the viewing window 20a allows one Combined display of the state of aging of the filter insert 14 and the filling level of a collecting chamber 88 of a water separating device of the liquid filter 10.
  • the filling level of the collecting chamber 88 can be read off the markings 26a-26c.
  • the collecting chamber 88 is filled with water up to the marking 26b.
  • the state of wear of the filter insert 14 can be read from the markings 78a-78d.
  • the state of wear is at wear level 78d, so that the filter insert 14 must be replaced.
  • the display device 18 has a locking body 82 which is to be moved from a locked position into a release position in order to enable the filter insert 14 to be coupled to the display device 18.
  • the filter insert 14 has an unlocking element 84, by means of which the blocking body 82 can be moved from the blocking position into the release position.
  • the locking body 82 is acted upon by a restoring spring 86 with a restoring force which holds the locking body 82 in the locking position, provided that the locking body 82 is not moved out of the locking position by the unlocking element 84.
  • the blocking body 82 is in the blocking position, in which the blocking body 82 prevents an elastic deformation of a material section of the display device 18, which is necessary for coupling the filter insert 14 to the display device 18.
  • An inward movement of the panel-side material projection 92 is prevented, so that the material projection 90 on the filter element side cannot be moved past the latter without unlocking.
  • the locking body 82 has been moved out of the locking position by the unlocking element 84.
  • the deformation of the upper material section of the visor body 24 is therefore no longer hindered by the blocking body 82.
  • the display device 18 can be clipped into the fastening section 52 of the filter insert 14 by the filter-side material projection 90 by an elastic inward movement of the panel-side material projection 92 can be moved past this.
  • the locking body 82 releases the elastic deformation of the material section of the display device 18 by the filter insert 14, which is necessary for coupling the filter insert 14 to the display device 18.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)

Abstract

L'invention concerne un filtre à liquide (10) ayant un boîtier de filtre (12) et une cartouche filtrante (14), qui est situé à l'intérieur du boîtier de filtre (12) de manière à pouvoir se déplacer axialement et qui présente un matériau filtrant (34), un liquide à filtrer pouvant s'écouler à travers le matériau filtrant (34) à partir d'un côté non filtré (36) vers un côté propre (38) du filtre à liquide (10), un mouvement axial de la cartouche filtrante (14) pouvant être induit par une différence de pression entre le côté non filtré (36) et le côté propre (38).
PCT/EP2020/074334 2019-09-19 2020-09-01 Filtre à liquide Ceased WO2021052746A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019125209.1A DE102019125209A1 (de) 2019-09-19 2019-09-19 Flüssigkeitsfilter
DE102019125209.1 2019-09-19

Publications (1)

Publication Number Publication Date
WO2021052746A1 true WO2021052746A1 (fr) 2021-03-25

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PCT/EP2020/074334 Ceased WO2021052746A1 (fr) 2019-09-19 2020-09-01 Filtre à liquide

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WO (1) WO2021052746A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI858658B (zh) * 2023-04-14 2024-10-11 崧泉企業股份有限公司 濾芯裝置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB926007A (en) * 1960-05-13 1963-05-15 Oscar Emmanuel Rosaen Improvements in oil filters
US3323649A (en) * 1966-02-14 1967-06-06 Rosaen Filter Co Filter device and electrical indicating means
US20080053879A1 (en) 2006-08-30 2008-03-06 Harris David N Filter pressure indicator
FR3012969A1 (fr) * 2013-11-13 2015-05-15 Peugeot Citroen Automobiles Sa Filtre a liquide

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1092887B (de) * 1958-03-21 1960-11-17 Oscar Emanuel Rosaen OElfilter mit Nebenstromventil
US3819052A (en) * 1972-09-15 1974-06-25 Donaldson Co Inc Fluid filter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB926007A (en) * 1960-05-13 1963-05-15 Oscar Emmanuel Rosaen Improvements in oil filters
US3323649A (en) * 1966-02-14 1967-06-06 Rosaen Filter Co Filter device and electrical indicating means
US20080053879A1 (en) 2006-08-30 2008-03-06 Harris David N Filter pressure indicator
FR3012969A1 (fr) * 2013-11-13 2015-05-15 Peugeot Citroen Automobiles Sa Filtre a liquide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI858658B (zh) * 2023-04-14 2024-10-11 崧泉企業股份有限公司 濾芯裝置

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