A filter assembly for removing material entrained in a fluid stream includes a housing having a head part and a body part, and inlet and outlet ports for the fluid that is to be filtered, in which at least one of the ports is provided in the head part, the head part having a chamber port fluidly con
A filter assembly for removing material entrained in a fluid stream includes a housing having a head part and a body part, and inlet and outlet ports for the fluid that is to be filtered, in which at least one of the ports is provided in the head part, the head part having a chamber port fluidly connected to the at least one port in the head part, the head and body parts having first formations which enable them to be connected to one another and separated by relative rotation. The assembly includes a filter element for removing material entrained in the fluid stream that can be received in the body part, the filter element and body part having second formations which restrict relative rotation between them, the filter element having a filter port, in which a fluid tight connection can be provided between the filter port and the chamber port by sliding one of them into the other along a first axis. One of the head part and the filter element provides an inclined surface which is inclined relative to the first axis, and the other provides an ejector part which can act against the said inclined surface so as to push the filter element away from the head part as the head part and the body part are separated by relative rotation, so as to free the filter port from the chamber port.
대표청구항▼
1. A filter assembly for removing material entrained in a fluid stream, comprising: a housing having a head part and a body part, and inlet and outlet ports for the fluid that is to be filtered, in which at least one of the ports is provided in the head part, the head part having a chamber port flui
1. A filter assembly for removing material entrained in a fluid stream, comprising: a housing having a head part and a body part, and inlet and outlet ports for the fluid that is to be filtered, in which at least one of the ports is provided in the head part, the head part having a chamber port fluidly connected to the at least one port in the head part, the head and body parts having first formations which enable them to be connected to one another and separated by relative rotation;a filter element for removing material entrained in the fluid stream that can be received in the body part, the filter element having outwardly extending ribs which are slidingly received in corresponding grooves in the body part when the filter element is assembled into the body part, the engagement between the ribs and the grooves restricting relative rotation between the filter element and the body part and allowing the filter element to be separated from the body part by lifting it out axially, the filter element having a filter port, in which the assembly includes a compressible O-ring which is positioned between the filter port and the chamber port to provide a fluid tight connection between the filter port and the chamber port by sliding one of them into the other along a first axis;in which one of the head part and the filter element provides an inclined surface which is inclined relative to the first axis, and extends helically at least part way around the axis of the assembly, and the other provides an ejector part which acts against the said inclined surface so as to push the filter element away from the head part as the head part and the body part are separated by relative rotation, so as to free the filter port from the chamber port. 2. A filter assembly as claimed in claim 1, in which the inclined surface is provided by the filter element. 3. A filter assembly as claimed in claim 2, in which the filter port is provided by a wall which projects from the filter element, and in which the inclined surface is provided by the free end of the filter port wall. 4. A filter assembly as claimed in claim 1, in which the inclined surface lies in a plane. 5. A filter assembly as claimed in claim 4, in which the filter port, chamber port and the angle of inclination of the inclined surface are configured so that the filter port can be freed from the chamber port by rotating the filter element by not more than 270°. 6. A filter assembly as claimed in claim 4, in which the filter port, chamber port and the angle of inclination of the inclined surface are configured so that the filter port can be freed from the chamber port by rotating the filter element by not more than 180°. 7. A filter assembly as claimed in claim 1, in which the ejector part is provided within a primary chamber at its second end. 8. A filter assembly as claimed in claim 1, in which the ejector part is provided by an internal wall of the head part. 9. A filter assembly for removing material entrained in a fluid stream, comprising: a housing having a head part and a body part, and inlet and outlet ports for the fluid that is to be filtered, in which at least one of the ports is provided in the head part, the head part having a chamber port fluidly connected to the at least one port in the head part, the head and body parts having first formations which enable them to be connected to one another and separated by relative rotation;a filter element for removing material entrained in the fluid stream that can be received in the body part, the filter element having outwardly extending ribs which are slidingly received in corresponding grooves in the body part when the filter element is assembled into the body part, the engagement between the ribs and the grooves restricting relative rotation between the filter element and the body part and allowing the filter element to be separated from the body part by lifting it out axially, the filter element having a filter port, in which the assembly includes a compressible O-ring which is positioned between the filter port and the chamber port to provide a fluid tight connection between the filter port and the chamber port by sliding one of them into the other along a first axis;in which one of the head part and the filter element provides an inclined surface which is inclined relative to the first axis and extends helically at least part way around the axis of the assembly, and the other provides an ejector part which acts against the said inclined surface so as to push the filter element away from the head part as the head part and the body part are separated by relative rotation, so as to free the filter port from the chamber port, in which the ejector part is provided by a surface within the head part which extends helically at least part way around the assembly axis. 10. A filter assembly for removing material entrained in a fluid stream, comprising: a housing having a head part and a body part, and inlet and outlet ports for the fluid that is to be filtered, in which at least one of the ports is provided in the head part, the head part having a chamber port fluidly connected to the at least one port in the head part, the head and body parts having first formations which enable them to be connected to one another and separated by relative rotation;a filter element for removing material entrained in the fluid stream that can be received in the body part, the filter element having outwardly extending ribs which are slidingly received in corresponding grooves in the body part when the filter element is assembled into the body part, the engagement between the ribs and the grooves restricting relative rotation between the filter element and the body part and allowing the filter element to be separated from the body part by lifting it out axially, the filter element having a filter port, in which the assembly includes a compressible O-ring which is positioned between the filter port and the chamber port to provide a fluid tight connection between the filter port and the chamber port by sliding one of them into the other along a first axis;in which one of the head part and the filter element provides an inclined surface which is inclined relative to the first axis, and extends helically at least part way around the axis of the assembly, and the other provides an ejector part which acts against the said inclined surface so as to push the filter element away from the head part as the head part and the body part are separated by relative rotation, so as to free the filter port from the chamber port, in which the inclined surface extends helically at least part way around the assembly axis, and in which the ejector part is provided by a further inclined surface, which extends helically at least part way around the assembly axis. 11. A filler assembly for removing material entrained in a fluid stream, comprising: a housing having a head part and a body part, and inlet and outlet ports for the fluid that is to be filtered, in which at least one of the ports is provided in the head part, the head part having a chamber port fluidly connected to the at least one port in the head part, the head and body parts having first formations which enable them to be connected to one another and separated by relative rotation;a filter element for removing material entrained in the fluid stream that can be received in the body part, the filter element having outwardly extending ribs which are slidingly received in corresponding grooves in the body part when the filter element is assembled into the body part, the engagement between the ribs and the grooves restricting relative rotation between the filter element and the body part and allowing the filter element to be separated from the body part by lifting it out axially, the filter element having a filter port, in which the assembly includes a compressible O-ring which is positioned between the filter port and the chamber port to provide a fluid tight connection between the filter port and the chamber port by sliding one of them into the other along a first axis;in which one of the head part and the filter element provides an inclined surface which is inclined relative to the first axis, and extends helically at least part way around the axis of the assembly, and the other provides an ejector part which acts against the said inclined surface so as to push the filter element away from the head part as the head part and the body part are separated by relative rotation, so as to free the filter port from the chamber port, in which the head part includes an insert, formed separately from the head part, in which the insert is located in the primary chamber, and in which the ejector part is provided by the insert. 12. A filter element locatable within a housing having a head part and body part, for removing material entrained in a fluid stream, the filter element comprising: a cylindrical filter medium with first and second end caps, and defining an interior space circumscribing a central axis; one of the end caps having radially outwardly extending ribs which can be slidingly received in corresponding grooves in the body part when the filter element is assembled into the body part, the engagement between the ribs and the grooves restricting relative rotation between the filter element and the body part and allowing the filter element to be axially separated from the body part, the one end cap also having a filter port which can be sealingly connected to a chamber port in the body part, and a compressible O-ring, carried by and surrounding the filter port, and circumscribing an axis which is offset from the central axis;the one end cap of the filter element further having an inclined surface which is inclined relative to the central axis and which extends helically at least part way around the axis of the filter element, and which can cooperate with an ejector part in the head part which acts against the inclined surface so as to push the filter element away from the head part when the head part and the body part are separated by relative rotation, so as to free the filter port from the chamber port. 13. The filter element as in claim 12, wherein the inclined surface circumscribes the filter port. 14. The filter element as in claim 13, wherein the ribs are located in spaced relation around the one end cap, and each rib extends axially along the filter medium and has a rounded leading edge and a tapered trailing edge. 15. A filter element locatable within a housing having a head part and a body part, for removing material entrained in a fluid stream, the filter element comprising: a cylindrical filter medium with first and second end caps, and defining an interior space circumscribing a central axis; one of the end caps having radially outwardly extending formations which can be slidingly received in corresponding grooves in the body part when the filter element is assembled into the body part, the engagement between the formations restricting relative rotation between the filter element and the body part and allowing the filter element to be axially separated from the body part, the one end cap also having a filter port, which can be sealingly connected to a chamber port in the body part; and a compressible O-ring carried by and surrounding the filter port and which circumscribes an axis which is offset from the central axis;the one end cap of the filter element further having an inclined surface which is inclined relative to the central axis and which extends helically at least part way around the axis of the filter element, and which can cooperate with an ejector part in the head part which acts against the inclined surface so as to push the filter element away from the head part when the head part and the body part are separated by relative rotation, so as to free the filter port from the chamber port. 16. The filter element as in claim 15, wherein the inclined surface circumscribes the filter port.
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