DE102019122882A1 - Closure system for a liquid filter - Google Patents

Abstract

The invention relates to a closure system (10) for a liquid filter (200), with a closure receptacle (12) which is designed to be positioned within a filter housing (202) of the liquid filter (200), a closure body (14) which is in the closure receptacle (12) is inserted and can be moved axially within the closure receptacle (12) by a rotary movement, with liquid being drainable from the filter housing (202) of the liquid filter (200) via an axial movement of the closure body (14), is set up to prevent the closure body (14) from being automatically unscrewed from the closure receptacle (12).

Description

The invention relates to a closure system for a liquid filter, with a closure receptacle which is configured to be positioned within a filter housing of a liquid filter, a closure body which is inserted into the closure receptacle and can be moved axially within the closure receptacle by a rotary movement, with a Axial movement of the closure body, the release of a drain opening can take place and liquid can be drained from the filter housing of the liquid filter, and an anti-rotation lock which is designed to prevent the closure body from automatically unscrewing from the closure receptacle.

The invention also relates to a filter insert for a liquid filter, with a hollow cylindrical filter material body, a support structure on which the filter material body is arranged, and a closure system which allows liquid to be drained from a filter housing of the liquid filter.

In addition, the invention relates to a liquid filter with a filter housing, a filter insert which comprises a support structure on which a filter material body is arranged, the filter insert being inserted into the filter housing, and a closure system which closes a drain opening of the filter housing and a liquid outlet from the Filter housing allowed.

Liquid filters are used to remove particles from an operating fluid. The operating fluid can be, for example, water, coolant, fuel or oil, which is used, for example, to lubricate machine parts. To remove the particles, the liquid is passed through a liquid-permeable filter material to which the particles to be removed adhere.

In the case of hanging liquid filter systems, the filter housing can at least partially be designed as an open screw cap which, after the filter insert has been inserted, is screwed into a downward-facing opening in a liquid chamber. The liquid chamber is usually integrated into a liquid circuit of a machine, in particular an internal combustion engine. Due to the hanging design of the liquid filter, the filter housing is also filled with liquid outside of the operating time, which must be drained off before changing the filter insert.

Due to the fluctuating operating pressures within the filter housing and the necessity of regular replacement of the filter insert, high demands are placed on the closure systems of the corresponding liquid filters.

From the pamphlet DE 10 2014 201 887 A1 For example, a locking system with a frictional anti-rotation lock is known, with which a locking body is intended to ensure a secure and tight connection to a container housing even when relaxation occurs.

Furthermore, from the publication DE 199 61 580 A1 a liquid filter is known, the closure body of which is integrated into the filter insert, so that there is no need to insert and fix the closure body separately after changing the filter insert.

The closure systems for liquid filters known in the prior art, however, do not have sufficient operational reliability in the case of high pressure fluctuations within the filter housing and intense vibrations and / or require time-consuming maintenance measures when changing the filter insert.

The object on which the invention is based is thus to simplify the change of the filter insert of a liquid filter and at the same time to increase the operational reliability of the closure, in particular in the case of high pressure fluctuations and vibrations.

The object is achieved by a locking system of the type mentioned at the beginning, the anti-rotation lock of the locking system according to the invention having an axial stop which limits the axial movement of the locking body out of the locking receptacle.

The invention makes use of the knowledge that the operational reliability generated by an anti-rotation lock can be significantly increased if, as an alternative or in addition to the friction lock of the closure body known from the prior art, an axial stop is provided which limits the axial movement of the closure body out of the closure receptacle . An automatic release of the closure body by vibrations or pressure pulsations takes place in most cases in the direction of gravity, only with a very strong pressure pulsation a release against this is also possible. The axial stop ensures form-fit locking, which can only be released in the direction of gravity by deformation or damage to the form-fit partners. An automatic unscrewing of the closure body from the closure receptacle is therefore possible even with constantly changing and sustained high operating pressures Effectively avoided vibrations. In a particularly advantageous manner, the anti-rotation lock, which has an axial stop, can be combined with a locking receptacle which is to be positioned within the filter housing of the liquid filter. The closure body can thus be inserted into the closure receptacle before the filter insert is inserted into the filter housing. The closure receptacle together with the closure body can then be inserted into the filter housing together with the filter insert. Changing the filter insert is thus considerably simplified.

The closure body is preferably screwed into the closure receptacle. The closure body of the closure system can preferably be designed as an oil drain screw. The anti-rotation lock enables a space-saving design with high operational reliability. Furthermore, the complexity of the filter construction is considerably reduced in comparison to constructions with similar operational reliability, since, for example, no detents have to be designed to implement an anti-rotation device. Overall, the anti-rotation lock having an axial stop provides a robust and long-lasting lock.

In the assembled state of the closure system, an axial movement of the closure body can create a liquid passage through which liquid can flow out of the filter housing through a drain opening in the filter housing. To convert the rotational movement of the closure body into an axial movement, the closure receptacle and the closure body preferably have corresponding threaded sections. In addition to the deformation of movement, the threaded sections can also fulfill a sealing function and contribute to the sealing between the clean side and the raw side of the liquid filter. The axial stop of the anti-rotation lock can, for example, have a circumferential design and also contribute to sealing. The closure body can have ventilation recesses, via which an exchange of air between the surroundings and the interior of the filter housing is made possible while the liquid is being drained from the filter housing. The ventilation recesses can be designed, for example, in the shape of a slot.

In a preferred embodiment of the closure system according to the invention, the closure receptacle is connected to a support structure of a filter insert which can be inserted into the filter housing. The closure receptacle is preferably attached to the carrier structure of the filter insert in a detachable or non-detachable manner. The closure receptacle and / or the support structure can be formed from a plastic, a metal and / or a metal alloy. By connecting the closure receptacle to the support structure, a unit of filter insert, closure receptacle and closure body can be inserted into the filter housing or removed from the filter housing when the filter insert is inserted and / or removed from the filter housing. This eliminates the need to subsequently tighten the closure body in the inserted state of the filter insert. Damage caused by tightening the closure body is thus effectively avoided. The change of the filter insert is thus considerably accelerated and simplified again.

In a further preferred embodiment of the closure system according to the invention, the closure receptacle is an integral part of at least part of the support structure of the filter insert. The closure receptacle and the part of the support structure connected to the closure receptacle are designed, for example, as a one-piece plastic injection-molded part. In this way, a durable and robust closure construction with a reduced number of parts is provided, the production effort of which is considerably reduced compared to constructions with a higher number of parts.

In an alternative embodiment of the closure system according to the invention, the closure receptacle is connected to the carrier structure of the filter insert in a form-fitting and / or force-fitting manner. Due to the positive and / or non-positive connection between the lock receptacle and the carrier structure, the lock receptacle is preferably connected to the carrier structure in a reversible and non-destructive releasable manner. The closure receptacle can preferably be separated from the support structure of the filter insert without tools. The connection between the closure receptacle and the support structure of the filter insert can be, for example, a snap connection with one or more snap hooks. The closure receptacle can be designed as an exchangeable adapter, so that different closure bodies can be used in a liquid filter by using different adapters.

In an advantageous development of the closure system according to the invention, the closure receptacle can be fixed within the filter housing via one or more snap hooks. For this purpose, the closure receptacle preferably has one or more material projections which extend in the radial direction and which can be brought into engagement with the one or more snap hooks. In particular, a locking receptacle is preferred which has a circumferential fastening web which extends outward in the radial direction and which can be brought into engagement with the one or more snap hooks. One or more Snap hooks can be an integral part of the filter housing or attached to the filter housing. The snap connection allows quick assembly and disassembly of the filter insert and provides a non-destructive and reversibly detachable connection.

In a further embodiment of the locking system according to the invention, the axial stop of the anti-rotation lock comprises a stop surface and a contact surface, the axial distance of which can be changed via a rotary movement of the locking body. Alternatively or additionally, the stop surface and the contact surface of the axial stop of the anti-rotation lock can be brought into contact and out of contact via a rotational movement of the closure body. In the event of a rotational movement of the closure body, the contact surface is preferably moved axially, the position of the stop surface not being changeable via the rotational movement of the closure body.

In a further advantageous embodiment of the closure system according to the invention, the closure body for draining liquid from the filter housing of the liquid filter is designed to be rotatable into the filter housing. The axial stop of the anti-rotation lock preferably comprises a projection on the closure body which extends outward in the radial direction and which strikes a stop surface when the closure body is unscrewed. In this way, a direct axial stop is implemented for the closure body, which prevents the closure body from rotating out of its own accord, for example due to pressure fluctuations and / or vibrations. The projection on the closure body provides a contact surface which is in contact with the stop surface in the stop state. The projection, the contact surface and / or the stop surface can be designed circumferentially. The contact surface and / or the stop surface can be designed to be inclined to the orthogonal to the axial direction. The axial direction extends preferably parallel or in alignment with the longitudinal axis of the closure body and / or with the central axis of the outlet opening of the filter housing.

In a preferred development of the closure system according to the invention, the stop surface against which the projection on the closure body strikes when the closure body is unscrewed is part of a support structure of a filter insert which can be inserted into the filter housing. The stop surface can be arranged on an end face of a cylindrical section of the support structure facing away from the drain opening. The cylindrical section can be a collar surrounding the closure body and / or have a threaded section on its inside, into which a corresponding threaded section of the closure body is screwed. The cylindrical section of the support structure preferably extends upwards from a lower end disk of the support structure away from the outlet opening of the filter housing.

A closure system according to the invention is also advantageous in which the stop surface against which the projection on the closure body strikes when the closure body is unscrewed is part of the filter housing. The stop surface can be arranged on an end face of a cylindrical section of the filter housing facing the drain opening. The outlet opening of the filter housing is preferably arranged opposite an insertion opening of the filter housing, via which the filter insert, preferably together with the closure receptacle and closure body, can be inserted into the filter housing.

In a further embodiment of the closure system according to the invention, the closure body for draining liquid from the filter housing of the liquid filter is designed to be rotatable out of the filter housing. The axial stop of the anti-rotation lock preferably comprises a circumferential seal which is arranged on the closure body and strikes a stop surface when the closure body is unscrewed. An indirect axial stop for the closure body is thus implemented via the circumferential seal, which prevents the closure body from being unscrewed automatically, for example due to pressure fluctuations and / or vibrations. A circumferential seal receptacle, within which the circumferential seal is arranged, is preferably provided on the closure body. The seal receptacle can be a circumferential receiving groove. The seal can be an O-ring.

In a further preferred embodiment of the closure system according to the invention, the stop surface against which the seal arranged on the closure body strikes when the closure body is unscrewed is part of a radial direction inwardly or outwardly extending projection. The seal provides a contact surface which, in the stop state, is in contact with the stop surface of the projection. The projection, the contact surface and / or the stop surface can be designed circumferentially. The contact surface and / or the stop surface can be inclined to the orthogonal to the axial direction.

In a further development of the closure system according to the invention, the projection extending inwards or outwards in the radial direction is part of the filter housing or a support structure of a filter insert which can be inserted into the filter housing. The filter housing or the support structure of the filter insert thus provides the stop surface of the axial stop. The projection is preferably arranged in the area of the outlet opening of the filter housing.

In addition, a closure system according to the invention is advantageous in which the seal arranged on the closure body is designed to be deformable in such a way that a deformation of the seal which can be caused when the closure body is subjected to a dismantling torque dissolves the axial stop. The seal is already slightly compressed in the operating state, so that the seal has a sufficient sealing effect. When the closure body is removed, the seal is deformed beyond the compression that is present in the operating state. In this way, the closure body including the seal can be removed. When the filter element and / or the liquid is changed, the closure body including the seal can be removed and replaced. There is no need for a separate, complex removal of the seal, so that changing the seal is considerably simplified. The axial force which acts on the seal when the dismantling torque is applied to the closure body is greater than the pressure force which acts on the seal when the liquid filter is operating properly. In this way, compression of the seal which would break up the axial stop is avoided during proper operation of the liquid filter.

The object on which the invention is based is also achieved by a filter insert of the type mentioned at the beginning, the closure system of the filter insert according to the invention being designed according to one of the embodiments described above. With regard to the advantages and modifications of the filter insert according to the invention, reference is first made to the advantages and modifications of the closure system according to the invention.

The support structure of the filter insert is preferably made of plastic and can be in one piece or in several pieces. The support structure can have a first end disk which is arranged on a first end face of the filter material body. Furthermore, the support structure can have a second end disk which is arranged on a second end face of the filter material body, the first end face and the second end face of the filter material body being arranged opposite one another. The first end disk and the second end disk can be connected to one another via a support sleeve. The carrier sleeve can be designed as a so-called support dome.

The object on which the invention is based is also achieved by a liquid filter of the type mentioned at the outset, the closure system of the liquid filter according to the invention being designed according to one of the embodiments described above or the filter insert of the liquid filter according to the invention being designed according to one of the embodiments described above. With regard to the advantages and modifications of the liquid filter according to the invention, reference is first made to the advantages and modifications of the closure system according to the invention and to the advantages and modifications of the filter insert according to the invention.

The filter housing of the liquid filter can, for example, be cup-shaped. The filter housing preferably has an insertion opening for inserting a filter insert, the insertion opening being located on the opposite side of the outlet opening of the filter housing. In particular, the filter housing is designed as a screw cap which can be screwed into an opening of a liquid chamber, wherein the liquid chamber can be integrated into a liquid circuit of a work machine, in particular an internal combustion engine. The fluid circuit can be an oil circuit. The liquid can be oil, for example.

Easily apparent to the person skilled in the art, the closure system can not only be used for draining the medium to be filtered itself, but can alternatively also be used for a liquid to be separated from the medium, such as water from fuel. In the case of a closure system for a discharge of a liquid to be separated, the filter can also be provided for gaseous media, such as air, combustion gases or crankcase gases, from which, for example, water or oil is separated. For the purposes of the invention, a liquid filter is understood to be any filter from which liquid has to be drained.

• 1 ein Ausführungsbeispiel des erfindungsgemäßen Verschlusssystems in einer perspektivischen Darstellung;
• 2 einen erfindungsgemäßen Filtereinsatz mit dem in der 1 abgebildeten Verschlusssystem während des Einsetzens in ein Filtergehäuse eines Flüssigkeitsfilters in einer seitlichen Schnittdarstellung;
• 3 einen erfindungsgemäßen Flüssigkeitsfilter mit dem in der 2 abgebildeten Filtereinsatz in einer seitlichen Schnittdarstellung;
• 4 den in der 3 abgebildeten Flüssigkeitsfilter während des Ablassens von Flüssigkeit aus dem Filtergehäuse in einer seitlichen Schnittdarstellung;
• 5 den in der 3 abgebildeten Flüssigkeitsfilter während des Ablassens von Flüssigkeit aus dem Filtergehäuse in einer seitlichen Schnittdarstellung;
• 6 die Entnahme des Filtereinsatzes aus dem in der 3 abgebildeten Flüssigkeitsfilter in einer seitlichen Schnittdarstellung;
• 7 eine Verschlussaufnahme und einen Verschlusskörper eines erfindungsgemäßen Verschlusssystems in einer perspektivischen Darstellung;
• 8 einen erfindungsgemäßen Filtereinsatz mit der Verschlussaufnahme und dem Verschlusskörper aus der 7 während des Einsetzens in ein Filtergehäuse eines Flüssigkeitsfilters in einer seitlichen Schnittdarstellung;
• 9 einen erfindungsgemäßen Flüssigkeitsfilter mit dem in der 8 abgebildeten Filtereinsatz in einer seitlichen Schnittdarstellung;
• 10 den in der 9 abgebildeten Flüssigkeitsfilter während des Ablassens von Flüssigkeit aus dem Filtergehäuse in einer seitlichen Schnittdarstellung;
• 11 den in der 9 abgebildeten Flüssigkeitsfilter während des Ablassens von Flüssigkeit aus dem Filtergehäuse in einer seitlichen Schnittdarstellung;
• 12 die Entnahme des Filtereinsatzes aus dem in der 9 abgebildeten Flüssigkeitsfilter in einer seitlichen Schnittdarstellung;
• 13 eine Verschlussaufnahme und einen Verschlusskörper eines erfindungsgemäßen Verschlusssystems in einer perspektivischen Darstellung;
• 14 einen erfindungsgemäßen Filtereinsatz mit der Verschlussaufnahme und dem Verschlusskörper aus der 13 während des Einsetzens in ein Filtergehäuse eines Flüssigkeitsfilters in einer seitlichen Schnittdarstellung;
• 15 einen erfindungsgemäßen Flüssigkeitsfilter mit dem in der 14 abgebildeten Filtereinsatz in einer seitlichen Schnittdarstellung;
• 16 eine Detaildarstellung des Verschlusssystems des in der 15 abgebildeten Flüssigkeitsfilters;
• 17 eine weitere Detaildarstellung des Verschlusssystems des in der 15 abgebildeten Flüssigkeitsfilters;
• 18 den in der 15 abgebildeten Flüssigkeitsfilter während des Ablassens von Flüssigkeit aus dem Filtergehäuse in einer seitlichen Schnittdarstellung;
• 19 die Entnahme des Filtereinsatzes aus dem in der 15 abgebildeten Flüssigkeitsfilter in einer seitlichen Schnittdarstellung;
• 20 eine Verschlussaufnahme und einen Verschlusskörper eines erfindungsgemäßen Verschlusssystems in einer perspektivischen Darstellung;
• 21 einen erfindungsgemäßen Filtereinsatz mit der Verschlussaufnahme und dem Verschlusskörper aus der 20 während des Einsetzens in ein Filtergehäuse eines Flüssigkeitsfilters in einer seitlichen Schnittdarstellung;
• 22 einen erfindungsgemäßen Flüssigkeitsfilter mit dem in der 21 abgebildeten Filtereinsatz in einer seitlichen Schnittdarstellung;
• 23 eine Detaildarstellung des Verschlusssystems des in der 22 abgebildeten Flüssigkeitsfilters;
• 24 eine weitere Detaildarstellung des Verschlusssystems des in der 22 abgebildeten Flüssigkeitsfilters;
• 25 den in der 22 abgebildeten Flüssigkeitsfilter während des Ablassens von Flüssigkeit aus dem Filtergehäuse in einer seitlichen Schnittdarstellung; und
• 26 die Entnahme des Filtereinsatzes aus dem in der 22 abgebildeten Flüssigkeitsfilter in einer seitlichen Schnittdarstellung.

Preferred embodiments of the invention are explained and described in more detail below with reference to the accompanying drawings. Show:

• 1 an embodiment of the locking system according to the invention in a perspective view;
• 2 a filter insert according to the invention with the one in the 1 depicted closure system during insertion into a filter housing of a liquid filter in a lateral sectional view;
• 3rd a liquid filter according to the invention with the one in the 2 the filter insert shown in a sectional side view;
• 4th in the 3rd Liquid filter shown during the discharge of liquid from the filter housing in a side sectional view;
• 5 in the 3rd Liquid filter shown during the discharge of liquid from the filter housing in a side sectional view;
• 6th the removal of the filter insert from the 3rd liquid filter shown in a side sectional view;
• 7th a closure receptacle and a closure body of a closure system according to the invention in a perspective view;
• 8th a filter insert according to the invention with the closure receptacle and the closure body from the 7th during insertion into a filter housing of a liquid filter in a lateral sectional view;
• 9 a liquid filter according to the invention with the one in the 8th the filter insert shown in a sectional side view;
• 10 in the 9 Liquid filter shown during the discharge of liquid from the filter housing in a side sectional view;
• 11 in the 9 Liquid filter shown during the discharge of liquid from the filter housing in a side sectional view;
• 12th the removal of the filter insert from the 9 liquid filter shown in a side sectional view;
• 13th a closure receptacle and a closure body of a closure system according to the invention in a perspective view;
• 14th a filter insert according to the invention with the closure receptacle and the closure body from the 13th during insertion into a filter housing of a liquid filter in a lateral sectional view;
• 15th a liquid filter according to the invention with the one in the 14th the filter insert shown in a sectional side view;
• 16 a detailed representation of the locking system of the 15th pictured liquid filter;
• 17th Another detailed representation of the locking system of the 15th pictured liquid filter;
• 18th in the 15th Liquid filter shown during the discharge of liquid from the filter housing in a side sectional view;
• 19th the removal of the filter insert from the 15th liquid filter shown in a side sectional view;
• 20th a closure receptacle and a closure body of a closure system according to the invention in a perspective view;
• 21 a filter insert according to the invention with the closure receptacle and the closure body from the 20th during insertion into a filter housing of a liquid filter in a lateral sectional view;
• 22nd a liquid filter according to the invention with the one in the 21 the filter insert shown in a sectional side view;
• 23 a detailed representation of the locking system of the 22nd pictured liquid filter;
• 24 Another detailed representation of the locking system of the 22nd pictured liquid filter;
• 25th in the 22nd Liquid filter shown during the discharge of liquid from the filter housing in a side sectional view; and
• 26th the removal of the filter insert from the 22nd liquid filter shown in a side sectional view.

The 1 shows a locking system 10 for a liquid filter 200 , the locking system 10 a lock receptacle 12th and a closure body 14th having. The lock mount 12th and the closure body 14th are designed as plastic injection molded parts. Alternatively, the closure receptacle and / or the closure body 14th can also be made of metal. The lock mount 12th is set up within a filter housing 202 of the liquid filter 200 to be positioned. The closure body 14th is in a recess of the lock receptacle 12th screwable. For this purpose, the lock receptacle 12th and the closure body 14th corresponding thread sections 16a , 16b on. By rotating the closure body 14th is the closure body 14th axially within the lock receptacle 12th moveable.

When the locking system 10 in a filter housing 202 a liquid filter 200 is used is via an axial movement of the closure body 14th Liquid from the filter housing 202 of the liquid filter 200 drainable. On the closure body 14th are ventilation recesses 30th arranged, which during the drainage of liquid from the filter housing 202 of the liquid filter 200 an exchange of air between the environment and the interior of the filter housing 202 allow. The ventilation recesses 30th are designed as elongated slots.

The 2 shows a filter insert 100 which that in the 1 locking system shown 10 includes. The lock mount 12th is part of a support structure 102 of the filter insert 100 , being attached to the support structure 102 a hollow cylindrical filter material body 106 is arranged. The support structure 102 is designed in several parts, with only the lock receptacle 12th comprehensive part is shown. That the lock mount 12th comprehensive part of the support structure 102 has a lower end plate 104 on, which on a lower end face of the filter material body 106 is arranged. The support structure 102 can also have a second end plate 108 have, which on the upper end face of the filter material body 106 is arranged. The upper end disk 108 is in the 2 not shown.

In the illustrated state of the locking system 10 is the closure body 14th into the lock receptacle 12th screwed in. The screwing in of the closure body 14th into the lock receptacle 12th can by means of a in the mounting recess 42 tool used. Hand-tight tightening, which is usually sufficient for proper operation, can also be achieved by turning the closure body by hand 14th and lock holder 12th respectively. The closure body 14th can also be done before the filter insert is assembled 100 , ie before the attachment of the filter material body 106 at the end plate 104 , in the lock receptacle 12th be used.

The filter insert 100 is when assembling the liquid filter 200 through the insertion opening 206 of the filter housing 202 into the interior of the filter housing 202 to use. The filter housing 202 is designed as a screw cap and has the insertion opening 206 opposite side has a drainage opening 204 on over which the liquid from the liquid filter 200 is drainable. The filter housing 202 is via a mounting thread 210 can be screwed into an opening of a liquid chamber. The filter housing also includes 202 several support pins 208a - 208g on which the lower end plate 104 of the filter insert 100 is to be placed in the context of the insertion process.

The 3rd shows the filter insert 100 after insertion into the filter housing 202 of the liquid filter 200 . The circumferential seal designed as an O-ring 24 seals the closure body 14th in the state shown opposite the wall of the drain opening 204 from. The anti-rotation lock of the locking system 10 has an axial stop described below 15th on which the axial movement of the closure body 14th from the lock holder 12th limited out. This means that the closure body is unscrewed automatically 14th even with high pressure fluctuations within the filter housing 202 and / or intense vibrations from the axial stop 15th prevented.

The axial stop 15th the anti-rotation lock comprises a projection extending outward in the radial direction 18th on the closure body 14th . The lead 18th represents a contact surface 20th ready, which in the stop state with a stop surface 22nd is in contact. The axial distance of the stop surface 22nd and the contact area 20th is via a rotary movement of the closure body 14th changeable. Thus, the stop surface 22nd and the contact area 20th via a rotary movement of the closure body 14th when inserting the closure body 14th bring in contact. For draining the liquid from the filter housing 202 of the liquid filter 200 are the stop surface 22nd and the contact area 20th Can also be brought out of contact via an opposite rotary movement.

The contact area 20th and the stop surface 22nd form a sealing bond when in contact; for this purpose, one or both surfaces can also be designed to be slightly flexible. A clean side and a raw side of the filter element 100 are thus safely separated from each other. At the dissolution of the contact of the contact surface 20th and stop surface 22nd If this seal is no longer given and pure oil can run down through the thread.

The contact area 20th and the stop surface 22nd are circumferential and inclined to the orthogonal of the axial direction. The stop surface 22nd against which the projection 18th on the closure body 14th when unscrewing the closure body 14th is part of the support structure 102 of the filter insert 100 . The stop surface 22nd is at one of the drainage ports 204 facing away from the end face of a cylindrical section 32 the support structure 102 arranged. The cylindrical section 32 is a the closure body 14th surrounding collar and has a threaded portion on its inside 16a on, in which a corresponding thread section 16b of the closure body 14th is screwed in. The cylindrical section 32 the support structure 102 extends from the lower end plate 104 the support structure 102 up from the drain port 204 path.

The 4th shows the liquid filter 200 while draining liquid from the Filter housing 202 . Here was a tool 300 in the central recess 28 (see. 1 ) used to the breech body 14th by means of the tool 300 relative to the lock receptacle 12th to twist. In the illustrated embodiment, the closure body is 14th for draining liquid from the filter housing 202 of the liquid filter 200 into the filter housing 202 to turn in. The thread is designed in such a way that it can be turned counterclockwise, ie that an operator can control the tool 300 used in the usual way to unscrew. In this way, accidental damage due to incorrect operation is avoided. The axial stop 15th the anti-rotation lock comprises a projection extending outward in the radial direction 18th on the closure body 14th , which merely unscrews the closure body 14th downwards, ie in the direction of gravity, prevented. The axial travel of the closure body 14th upwards is through the axial stop 15th not restricted. By twisting the closure body 14th becomes the seal 24 from the wall of the drain opening 204 pushed off and in the locking element 14th provided drainage channels 26a-26c provide a connection between the interior of the filter housing 202 and the central recess 28 here. Because the central recess 28 still through the tool 300 is closed, no or only a very small amount of the liquid can escape from the filter housing 202 flow away. A contamination of one of the tools 300 operating operator is thus during the rotation of the closure body 14th avoided.

According to the in 5 removal of the tool shown 300 can be in the filter housing 202 liquid via the drainage channels 26a - 26c of the closure body 14th and the central recess 28 through the drain hole 204 of the filter housing 202 flow away. The ventilation recesses ensure the drainage 30th (see. 1 ) on the closure body 14th for an exchange of air between the environment and the interior of the filter housing 202 .

In the 6th is the removal of the filter insert 100 after draining the liquid from the filter housing 202 shown. Because the closure body 14th still in the lock holder 12th is screwed in when changing the filter insert 100 a unit of filter insert 100 and closure body 14th taken. The removed closure body 14th can, preferably after changing the seal 24 can be used with a new filter element. This is preferably done when changing the filter insert 100 also a replacement of the closure body 14th including seal 24 . When the closure body 14th is formed from a plastic, this does not have to be from the lock receptacle 12th can be removed and used with the filter insert 100 must be disposed of together, as incineration occurs together with the filter insert 100 is possible. A new filter insert 100 then expediently already comprises a new closure body 14th with a new seal 24 so that an operator can only use the filter element 100 must use, ie a simplified operation is achieved.

The 7th shows a lock recording 12th and a closure body 14th an alternative locking system 10 . The lock mount 12th and the closure body 14th again have corresponding thread sections 16a , 16b on. In the illustrated combination of lock receptacle 12th and closure body 14th does not become a direct axial stop 15th between the closure body 14th and the lock holder 12th implemented. A locking system 10 with an axial stop 15th is only used in combination with a filter housing 202 educated. The lock mount 12th has a circumferential collar which is provided with a sealing lip 23 concludes.

The 8th shows that the filter housing 202 in which the filter insert 100 including lock mount 12th and closure body 14th is to be used, a stop surface 212 having. The stop surface 212 is at one of the drainage ports 204 applied end face of a cylindrical section 214 of the filter housing 202 arranged. The sealing lip 23 lies on a suitable surface of the closure body 14th fully and thus seals the clean side of the filter insert 100 against the raw side.

The 9 shows the filter insert 100 in the inserted state. The closure body 14th is again to drain liquid from the filter housing 202 of the liquid filter 200 into the filter housing 202 to turn in. The axial stop 15th the anti-rotation lock of the locking system 10 has an outwardly extending protrusion 18th on the closure body 14th on, which when trying to unscrew the closure body 14th to the stop surface 212 of the filter housing 202 strikes. It becomes an axial stop 15th between closure body 14th and filter housing 202 implemented. The one by the ledge 18th provided contact area 20th and the stop surface 212 of the filter housing 202 are circumferential and inclined to the orthogonal of the axial direction. The axial stop 15th prevents the locking body from unscrewing by itself 14th from the lock holder 12th even with large pressure fluctuations within the filter housing 202 or intense vibrations.

In the 10 becomes the closure body 14th by means of the in the central recess 28 used tool 300 twisted and thus axially into the Filter housing 202 moved in. Due to the axial movement of the closure body 14th is the circumferential seal designed as an O-ring 24 disengaged. Also the sealing lip 23 is no longer on the closure body 14th at.

After removing the tool 300 from the central recess 28 of the closure body 14th can then that in the filter housing 202 liquid via the drainage channels 26a - 26c of the closure body 14th and the central recess 28 through the drain hole 204 of the filter housing 202 drain as it does in 11 is shown.

The 12th shows the removal of the filter insert 100 including closure body 14th after draining the liquid from the filter housing 202 . The closure body 14th can be pulled down from the filter element 100 unscrewed and, preferably after changing the seal 24 , with a new filter insert 100 be used. Alternatively, when changing the filter insert 100 also a new closure body 14th including new poetry 24 can be used, the new closure body can be used for this 14th also already in the new filter insert 100 be provided.

The 13th shows a further combination of lock mount 12th and closure body 14th , with the shutter mount 12th and the closure body 14th again corresponding thread sections 16a , 16b exhibit.

The 14th shows that the shutter recording 12th Part of a support structure 102 a filter insert 100 is. The support structure 102 has a lower end plate 104 and an upper end plate 108 on, which has a support sleeve 110 , a so-called support dome, are connected to one another. A hollow cylindrical filter material body 106 is on the support structure 102 arranged. The lock mount 12th is part of the multi-part support structure 102 educated.

The lock mount 12th has a circumferential fastening web that extends outward in the radial direction 34 on, via which a snap connection with the snap hook 216a , 216b of the filter housing 202 is feasible.

The 15th shows the filter insert 100 in the inserted state, with the snap hook 216a , 216b of the filter housing 202 with the fastening bar 34 the lock mount 12th are engaged. Over the circumferential seal designed as an O-ring 24 there will be a leakage in the filter housing 202 liquid through the drain opening 204 avoided.

The 16 shows that the locking system 10 of the liquid filter 200 also has an anti-rotation lock, which automatically unscrews the closure body 14th from the lock holder 12th prevented. The closure body 14th in this case is used to drain liquid from the filter housing 202 of the liquid filter 200 from the filter housing 202 to unscrew. The axial stop 15th is in this version through the all-round seal 24 and a radially inwardly extending circumferential protrusion 218 on the wall of the drain opening 204 formed on which the seal 24 when unscrewing the closure body 14th strikes.

The 17th shows that the radially inwardly extending protrusion 218 a stop surface 220 has, against which the on the closure body 14th arranged seal 24 when unscrewing the closure body 14th strikes.

The closure body 14th has a circumferential seal seat 36 on, within which the circumferential seal 24 is arranged. The seal holder 36 is designed as a circumferential receiving groove. The 17th also shows that the shutter recording 12th a circumferential contact area 40 has, which in the inserted state of the filter insert 100 with a support surface 222 of the filter housing is in contact, so that the closure receptacle 12th via the snap hook 216a , 216b and the circumferential support surface 222 is fixed.

The one on the closure body 14th arranged seal 24 is designed to be deformable in such a way that one when the closure body is applied 14th Deformation of the seal that can be caused by a dismantling torque 24 the axial stop 15th dissolves. A dismantling torque can, for example, with the one in the 18th illustrated tool 300 on the closure body 14th be applied. The seal 24 is used when removing the closure body 14th due to the circumferential projection 218 on the wall of the drain opening 204 additionally compressed, whereby the additional compression to dissolve the axial stop 15th is required. The force required for upsetting is greater than the forces that could result from vibrations or pressure pulsation. This provides an effective anti-rotation lock. Alternatively, it may also be necessary that the seal 24 to release the axial stop 15th not only has to be compressed, but even destroyed. In this case, the filter housing 202 also a shear edge can be provided which prevents the destruction of the seal 24 facilitated.

As in the 14th to 19th The lock mount is clearly visible 12th at the bottom End disk 104 held over bars. After removing the closure element 14th the liquid can flow through the gaps formed between the webs in the thread 16a limited receiving space and through this to the drainage opening 204 stream. Alternatively, however, could also be between the thread 16a limited receiving space and the wall of the drain opening 204 an opening for the liquid can be provided.

The 19th shows how the filter insert 100 including the lock mount 12th after draining the liquid from the filter housing 202 is removed. When changing the filter insert 100 This inevitably also results in an exchange of the closure receptacle 12th .

The one in the 20th illustrated lock receptacle 12th is reversible and non-destructive detachable from a lower end plate 104 a support structure 102 attachable. To this end, the end plate 104 Snap hook 112a - 112d on, which engage with recesses in the lock receptacle 12th can be brought. The lock mount 12th poses with the help of feather wings 38a-38d , which is located on the end disk 104 support, a bracing against the snap hook 112a-112d for sure.

The one in the 21 shown filter insert 100 is the lock mount 12th form-fitting and reversibly detachable from the support structure 102 of the filter insert 100 connected. The lock mount 12th functions in this embodiment as a replaceable adapter, so that different closure bodies are used by using different adapters 14th can be used.

The 22nd shows the filter insert 100 in the inserted state. The seal 24 prevents those in the filter housing 202 liquid through the drain opening 204 from the filter housing 202 can flow out.

In the 23 and 24 is shown that the filter housing 202 in the area of the drain opening 204 a head start 218 has, which has a stop surface 220 wearing. In combination with the all-round seal 24 is again an anti-rotation lock with an axial stop 15th implemented, with which an automatic unscrewing of the closure body 14th from the lock holder 12th is prevented. The lock mount 12th is again based on the contact patch 40 on the support surface 222 of the filter housing 202 from.

To bring about the in the 25th The state shown is the closure body 14th about the tool 300 to apply a disassembly torque, wherein the disassembly torque is a deformation of the seal 24 caused at which the axial stop 15th is dissolved. The dismantling torque thus ensures an additional compression of the seal, which requires the removal of the closure body 14th including seal 24 allowed.

In the case of the 26th Removal of the filter insert shown 100 from the filter housing 202 becomes the lock mount at the same time 12th taken. Due to the reversibly detachable connection between the support structure 102 of the filter insert 100 and the lock holder 12th can the lock recording 12th when changing the filter insert 100 continued to be used or by a different lock holder 12th be replaced.

List of reference symbols

10

Locking system

12th

Lock mount

14th

Locking body

15th

Axial stop

16a, 16b

Threaded sections

18th

head Start

20th

Contact area

22nd

Stop surface

23

Sealing lip

24

poetry

26a-26c

Drainage channels

28

Central recess

30th

Ventilation recesses

32

cylindrical section

34

Fastening bar

36

Seal holder

38a-38d

Feather wing

40

Footprint

42

Mounting recess

100

Filter insert

102

Support structure

104

End disk

106

Filter material body

108

End disk

110

Carrier sleeve

112a-112d

Snap hook

200

Liquid filter

202

Filter housing

204

Drain opening

206

Insertion opening

208a-208g

Support pins

210

Mounting thread

212

Stop surface

214

cylindrical section

216a, 216b

Snap hook

218

head Start

220

Stop surface

222

Support surface

300

Tool

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102014201887 A1 [0007]
• DE 19961580 A1 [0008]

Claims (15)

Closure system (10) for a liquid filter (200), with - a closure receptacle (12) which is designed to be positioned within a filter housing (202) of the liquid filter (200); - A closure body (14) which is inserted into the closure receptacle (12) and can be moved axially within the closure receptacle (12) by means of a rotary movement, with liquid from the filter housing (202) of the liquid filter (200) being discharged via an axial movement of the closure body (14) is drainable; and - an anti-rotation lock which is set up to prevent the closure body (14) from being automatically unscrewed from the closure receptacle (12); characterized in that the anti-rotation lock has an axial stop (15) which limits the axial movement of the closure body (14) out of the closure receptacle (12). Locking system (10) Claim 1 , characterized in that the closure receptacle (12) is connected to a support structure (102) of a filter insert (100) which can be inserted into the filter housing (202). Locking system (10) Claim 2 , characterized in that the closure receptacle (12) is an integral part of at least part of the support structure (102) of the filter insert (100). Locking system (10) Claim 2 , characterized in that the closure receptacle (12) is positively and / or non-positively connected to the support structure (102) of the filter insert (100). Closure system (10) according to one of the preceding claims, characterized in that the closure receptacle (12) can be fixed within the filter housing (202) via one or more snap hooks (216a, 216b). Closure system (10) according to one of the preceding claims, characterized in that the axial stop (15) of the anti-rotation lock comprises a stop surface (22, 212, 220) and a contact surface (20), the axial distance of which can be changed via a rotary movement of the closure body (14) and / or which can be brought into contact and out of contact via a rotary movement of the closure body (14). Closure system (10) according to one of the preceding claims, characterized in that the closure body (14) for draining liquid from the filter housing (202) of the liquid filter (200) is designed to be rotatable into the filter housing (202), the axial stop (15) the anti-rotation lock comprises a projection (18) on the closure body (14) which extends outward in the radial direction and which strikes a stop surface (22, 212) when the closure body (14) is unscrewed. Locking system (10) Claim 7 , characterized in that the stop surface (22) against which the projection (18) on the closure body (14) strikes when the closure body (14) is unscrewed, is part of a support structure (102) of a filter insert (100) which is inserted into the filter housing (202) can be used. Locking system (10) Claim 7 , characterized in that the stop surface (212) against which the projection (18) on the closure body (14) strikes when unscrewing the closure body (14) is part of the filter housing (202). Closure system (10) according to one of the Claims 1 to 6th , characterized in that the closure body (14) for draining liquid from the filter housing (202) of the liquid filter (200) is designed to be rotatable out of the filter housing (202), the axial stop (15) of the anti-rotation device being an on the closure body (14) arranged circumferential seal (24) which strikes a stop surface (220) when the closure body (14) is unscrewed. Locking system (10) Claim 10 , characterized in that the stop surface (220), against which the seal (24) arranged on the closure body (14) strikes when the closure body (14) is unscrewed, is part of a projection (218) extending inwards or outwards in the radial direction . Locking system (10) Claim 11 , characterized in that the radially inwardly or outwardly extending projection (218) is part of the filter housing (202) or a support structure (102) of a filter insert (100) which can be inserted into the filter housing (202). Closure system (10) according to one of the Claims 10 to 12th , characterized in that the seal (24) arranged on the closure body (14) is designed to be deformable in such a way that a deformation of the seal (24) which can be caused when the closure body (14) is subjected to a disassembly torque dissolves the axial stop. Filter insert (100) for a liquid filter (200), with - a hollow cylindrical filter material body (106); - a support structure (102) on which the filter material body (106) is arranged; and - a closure system (10) which allows liquid to be drained from a filter housing (202) of the liquid filter (200); characterized in that the locking system (10) is designed according to one of the preceding claims. Liquid filter (200), with - a filter housing (202); - A filter insert (100) which comprises a support structure (102) on which a filter material body (106) is arranged, the filter insert (100) being inserted into the filter housing (202); and - a closure system (10) which closes an outlet opening (204) of the filter housing (202) and allows liquid to be drained from the filter housing (202); characterized in that the locking system (10) according to one of the Claims 1 to 13th and / or the filter insert (100) after Claim 14 is trained.

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