Patent ID: 11931675
Assignee: VOLVO TRUCK CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 10:
11. A liquid filtering device comprising:
a filter element, comprising:
a filter medium configured with an annular shape, having a central axis and forming inside a central channel extending substantially axially;
first and second end plates, each plate covering one axial end of the filter medium and being sealingly mounted on said axial end, the first end plate having a central opening substantially coaxial with the central axis and in fluid communication with the channel;
a central perforated rigid tube that extends axially between the first and second end plates and having an inner perforated wall delimiting the central channel;
the liquid filtering device also comprising a filter housing receiving the filter element,
wherein
the central perforated rigid tube comprises at least one guiding path, arranged inside the central perforated rigid tube, adapted to generate, by contact with a following member of a rotatable element of the filter housing, at least a first, progressive rotational movement of the rotatable element of the filter housing when the filter element is mounted in the filter housing during a first translation movement along the central axis:
said at least one guiding path comprises at least one portion of a helical path for obtaining the first, progressive rotational movement;
said filter housing including a bottom wall, a peripheral wall, a main opening at its axial end opposite the bottom wall, and an axial member which is configured to be inserted in the filter element channel, the axial member forming an inner outlet channel, the axial member comprising at least one liquid outlet opening allowing liquid to flow from the channel of the filter element towards the inner outlet channel of the axial member,
a filter cover to which the filter element is attached, the filter element being attached to the filter cover with a possibility of rotation between them,
wherein the filter element comprises an anti-rotation device and the filter housing comprises an anti-rotation device, and wherein the filter element is inserted in the filter housing without possibility of rotation of the filter element with respect to the filter housing thanks to the anti-rotation device of the filter element that cooperates with the anti-rotation device formed in the filter housing,
wherein:
the axial member comprises a rotatable portion forming the rotatable element, and a stationary portion,
the stationary portion comprises the liquid outlet opening, and the rotatable portion comprises a first opening adapted to align with the liquid outlet opening, and adapted to close the liquid outlet opening,
the rotatable portion comprises at least one protruding element, forming the following member, adapted to be received in the guiding path of the filter element when the filter element is mounted in the filter housing,
in a first position of the filter element, the rotatable portion is positioned with respect to the stationary portion so that the liquid outlet opening is closed;
in a second position of the filter element, the rotatable portion is positioned with respect to the stationary portion so that the liquid outlet opening is open.