Filter with a replaceable filter insert

A replaceable filter insert, which interacts with a filter for a fluid medium, the filter comprising a filter housing and a cover, which is releasably connectable to the filter housing, a central stand pipe forming a part of the filter housing, wherein a locking ring is guided in an axially displaceable manner on the stand pipe, wherein the locking ring is preloaded by a force acting in a pushed-out direction pointing towards a free end of the stand pipe, wherein, in a pushed-out position, the locking ring is locked by a locking device against being pushed in, and wherein, when the filter insert is fitted into the filter housing, a seal provided on a first end disc interacts with a sealing surface of the filter housing to separate an untreated medium side from a clean medium side of the filter, when the locking ring is in the pushed-out position and when the filter insert is in axial contact with the locking ring, the seal provided on the first end disc of the filter insert is held at an axial distance from the corresponding sealing surface of the filter housing in the pushed-out direction and is held in a non-sealing position at a distance from the sealing surface by means of the locking device and the sealing surface and the seal interact so as to form a seal when the filter insert carrying the seal is in the pushed-in position when the locking device is unlocked,

• wherein the filter insert comprises a hollow-cylindrical filter cloth body and two end discs, the hollow-cylindrical filter cloth body enclosing a space between the two end discs, a first end disc of the two end discs encompassing a central through hole, wherein, leading with the first end disc, the filter insert can be plugged onto the central stand pipe, herein provision is made for unlocking means, which are guided by the filter insert and which, when the filter insert is pushed onto the stand pipe, actuate the locking device in an unlocking direction and enable the locking ring and the filter insert to be pushed in completely, and wherein the unlocking means are integrally molded on the filter insert, comprising:
• guide means, which are additionally arranged on the filter insert, being provided for interacting with position guide means arranged on an outer circumferential periphery of the stand pipe, wherein, by means of the position guide means, the unlocking means can be positively guided in a peripheral direction into a position which is suitable for engagement for unlocking the locking device when the filter insert is plugged onto the stand pipe and the filter insert can then be locked against being twisted in the peripheral direction, wherein the filter housing has a bottom comprising a central, hollow-cylindrical bottom part and the sealing surface on a filter housing side is arranged on an inner peripheral surface of the hollow-cylindrical bottom part;
• and
• wherein the seal provided on the first end disc extends radially outward from a central axis of the filter insert.

A filter for a fluid medium, comprising a filter housing and a cover, which is releasably connectable to the filter housing, comprising a replaceable filter insert, which comprises a hollow-cylindrical filter cloth body and two end discs, the hollow-cylindrical filter cloth body enclosing a space between the two end discs, a first end disc of the two end discs encompassing a central through hole, wherein, leading with the first end disc, the filter insert can be plugged onto a central stand pipe, which forms part of the filter housing, wherein a locking ring is guided in an axially displaceable manner on the stand pipe, wherein the locking ring is preloaded by a force acting in a pushed-out direction pointing towards a free end of the stand pipe, wherein, in a pushed-out position, the locking ring is locked by a locking device against being pushed in, wherein provision is made for unlocking means, which are guided by the filter insert and which, when the filter insert is pushed onto the stand pipe, actuate the locking device in an unlocking direction and enable the locking ring and the filter insert to be pushed in, and wherein, when the filter insert is fitted into the filter housing, a seal provided on the locking ring interacts with a sealing surface of the filter housing to separate an untreated medium side from a clean medium side of the filter, comprising:

• when the locking ring is in the pushed-out position and when the filter insert is in axial contact with the locking ring, the seal provided on the locking ring is held at an axial distance from the corresponding sealing surface of the filter housing in the pushed-out direction and is held in a non-sealing position at a distance from the sealing surface by means of the locking device and
• the sealing surface and the seal interact so as to form a seal when the locking ring carrying the seal is in the pushed-in position when the locking device is unlocked.

A replaceable filter insert, which interacts with a filter for a fluid medium, the filter comprising a filter housing and a cover, which is releasably connectable to the filter housing, a central stand pipe forming a part of the filter housing, wherein a locking ring is guided in an axially displaceable manner on the stand pipe, wherein the locking ring is preloaded by a force acting in a pushed-out direction pointing towards a free end of the stand pipe, wherein, in a pushed-out position, the locking ring is locked by a locking device against being pushed in, and wherein, when the filter insert is fitted into the filter housing, a seal provided on the locking ring interacts with a sealing surface of the filter housing to separate an untreated medium side from a clean medium side of the filter, when the locking ring is in the pushed-out position and when the filter insert is in axial contact with the locking ring, the seal provided on the locking ring is held at an axial contact with the locking ring, the seal provided on the locking ring is held at an axial distance from the corresponding sealing surface of the filter housing in the pushed-out direction and is held in a non-sealing position at a distance from the sealing surface by means of the locking device and the sealing surface and the seal interact so as to form a seal when the locking ring carrying the seal is in the pushed-in position when the locking device is unlocked,

• wherein the filter insert comprises a hollow-cylindrical filter cloth body and two end discs, the hollow-cylindrical filter cloth body enclosing a space between the two end discs, a first end disc of the two end discs encompassing a central through hole, wherein, leading with the first end disc, the filter insert can be plugged onto the central stand pipe, wherein provision is made for unlocking means, which are guided by the filter insert and which, when the filter insert is pushed onto the stand pipe, actuate the locking device in an unlocking direction and enable the locking ring and the filter insert to be pushed in completely, and wherein the unlocking means are integrally molded on the filter insert, comprising:
• guide means, which are additionally arranged on the filter insert, being provided for interacting with position guide means arranged on an outer periphery of the stand pipe, wherein, by means of the position guide means, the unlocking means can be positively guided in a peripheral direction into a position which is suitable for engagement for unlocking the locking device when the filter insert is plugged onto the stand pipe and the filter insert can then be locked against being twisted in the peripheral direction.

A replaceable filter insert, which interacts with a filter for a fluid medium, the filter comprising a filter housing and a cover, which is releasably connectable to the filter housing, a central stand pipe forming a part of the filter housing, wherein a locking ring is guided in an axially displaceable manner on the stand pipe, wherein the locking ring is preloaded by a force acting in a pushed-out direction pointing towards a free end of the stand pipe, wherein, in a pushed-out position, the locking ring is locked by a locking device against being pushed in, and wherein, when the filter insert is fitted into the filter housing, a seal provided on a first end disc interacts with a sealing surface of the filter housing to separate an untreated medium side from a clean medium side of the filter, when the locking ring is in the pushed-out position and when the filter insert is in axial contact with the locking ring, the seal provided on the first end disc of the filter insert is held at an axial distance from the corresponding sealing surface of the filter housing in the pushed-out direction and is held in a non-sealing position at a distance from the sealing surface by means of the locking device and the sealing surface and the seal interact so as to form a seal when the filter insert carrying the seal is in the pushed-in position when the locking device is unlocked,

• wherein the filter insert comprises a hollow-cylindrical filter cloth body and two end discs, the hollow-cylindrical filter cloth body enclosing a space between the two end discs, a first end disc of the two end discs encompassing a central through hole, wherein, leading with the first end disc, the filter insert can be plugged onto the central stand pipe, wherein provision is made for unlocking means, which are guided by the filter insert and which, when the filter insert is pushed onto the stand pipe, actuate the locking device in an unlocking direction and enable the locking ring and the filter insert to be pushed in completely, and wherein the unlocking means are arranged on a separate unlocking means body, comprising:
• guide means, which are additionally arranged on the filter insert, being provided for interacting with position guide means arranged on an outer periphery of the stand pipe, wherein, by means of the position guide means, the unlocking means can be positively guided in a peripheral direction into a position which is suitable for engagement for unlocking the locking device when the filter insert is plugged onto the stand pipe and the filter insert can then be locked against being twisted in the peripheral direction.

A replaceable filter insert, which interacts with a filter for a fluid medium, the filter comprising a filter housing and a cover, which is releasably connectable to the filter housing, a central stand pipe forming a part of the filter housing, wherein a locking ring is guided in an axially displaceable manner on the stand pipe, wherein the locking ring is preloaded by a force acting in a pushed-out direction pointing towards a free end of the stand pipe, wherein, in a pushed-out position, the locking ring is locked by a locking device against being pushed in, and wherein, when the filter insert is fitted into the filter housing, a seal provided on the locking ring interacts with a sealing surface of the filter housing to separate an untreated medium side from a clean medium side of the filter, when the locking ring is in the pushed-out position and when the filter insert is in axial contact with the locking ring, the seal provided on the locking ring is held at an axial distance from the corresponding sealing surface of the filter housing in the pushed-out direction and is held in a non-sealing position at a distance from the sealing surface by means of the locking device and the sealing surface and the seal interact so as to form a seal when the locking ring carrying the seal is in the pushed-in position when the locking device is unlocked,

• wherein the filter insert comprises a hollow-cylindrical filter cloth body and two end discs, the hollow-cylindrical filter cloth body enclosing a space between the two end discs, a first end disc of the two end discs encompassing a central through hole, wherein, leading with the first end disc, the filter insert can be plugged onto the central stand pipe, wherein provision is made for unlocking means, which are guided by the filter insert and which, when the filter insert is pushed onto the stand pipe, actuate the locking device in an unlocking direction and enable the locking ring and the filter insert to be pushed in completely, and wherein the unlocking means are arranged on a separate unlocking means body, comprising:
• guide means, which are additionally arranged on the filter insert, being provided for interacting with position guide means arranged on an outer periphery of the stand pipe, wherein, by means of the position guide means, the unlocking means can be positively guided in a peripheral direction into a position which is suitable for engagement for unlocking the locking device when the filter insert is plugged onto the stand pipe and the filter insert can then be locked against being twisted in the peripheral direction.