filter cartridge

Abstract

A filter cartridge for use in a filtration device for filtering liquids, the filter cartridge comprising a cap (8) displaceably mounted on a housing (2) between an actuation position, the cap (8) defining an actuation compartment (10) fluidly connected with an actuation port (19) of the housing (2), and a use position in which the volume of the actuation compartment (10) is reduced. The cap (8) comprises an actuation opening (11) and a use opening (20). In the actuation position, the actuation compartment (10) inside the cap (8) can be filled with liquid through the actuation opening (11) of the cap (8). Displacement of the cap (8) closes the actuation opening of the cap and reduces the volume of the actuation compartment to force at least a portion of the fluid from the actuation compartment through the actuation port into the housing, then through the filter material, until the cap in the use position contacts the housing, causing the use opening of the cap to overlap the inlet port of the housing, allowing fluid to pass through the inlet port and enter the housing.

Claims

1. A filter cartridge used in a filtration device for filtering liquids, The filter cartridge (1) comprises a housing (2) and a filter material (3) placed inside the housing (2). The housing (2) is provided with an inlet port (5) and an outlet port (6) such that a liquid fluid flow enters the housing (2) through the inlet port (5) and then passes through the filter material (3) inside the housing before exiting the housing (2) through the outlet port (6). In the filter cartridge, The filter cartridge (1) includes a cap (8) that is displaceably attached to the housing (2) between operating positions. The cap (8) forms an operating compartment (10) that is fluidly connected to the operating port (19) of the housing (2), and a usage position in which the volume of the operating compartment (10) is reduced. The cap (8) is provided with an operating opening (11) and a usage opening (20), The cap (8) can be moved from the operating position to the usage position, and in the operating position, the operating compartment (10) inside the cap (8) can be filled with liquid through the operating opening (11) of the cap (8). The displacement of the cap (8) closes the operating opening (11) of the cap (8) and reduces the volume of the operating compartment (10) until the cap in the operating position contacts the housing (2), thereby pushing at least a portion of the fluid from the operating compartment (10) through the operating port (19) into the housing (2), and then, via the filter material (3), the operating opening (19) of the cap aligns with the inlet port (5) of the housing (2), allowing the fluid to pass through the inlet port (5) into the housing (2). A filter cartridge characterized by the following features.

2. The filter cartridge (1) is equipped with a positive guide to guide the displacement of the cap (8) relative to the housing. The filter cartridge according to feature 1.

3. The filter cartridge (1) is equipped with a positive retention mechanism that holds the cap (8) in the position of use. The filter cartridge according to claim 2.

4. The housing (2) has a side surface (4) and a housing end surface (9) facing the cap (8). The cap (8) is closed on one side and has a side (12) that is fitted to surround the side (4) of the housing (2). The cap (8) surrounds a portion of the side (4) of the housing (2) and the end face (9) of the housing. A filter cartridge according to any one of claims 1 to 3, characterized by the above.

5. Similar to the side (12) of the cap (8), the housing end face (9) of the housing (2) encloses and surrounds the operating compartment (10) formed by the cap (8) in the operating position. The filter cartridge according to feature 4.

6. The structure (18) contained within the housing (12) is positioned to form a first displacement, for example, rotation, that forms part of the displacement of the cap (8) from the operating position to the use position, and is positioned to close the operating opening (11) when the displacement is formed, and further displacement after the first displacement is completed and the operating opening (11) is closed by the structure includes an axial displacement that reduces the size of the operating compartment (10). The filter cartridge according to claim 4 or 5, characterized by the above.

7. The housing (2) is cylindrical, and the cap (8) is hollow and cylindrical. The inner diameter of the side (12) of the cap (8) is greater than or equal to the outer diameter of the side (4) of the housing (2). A filter cartridge according to any one of claims 4 to 6, characterized by the features described herein.

8. The positive guide has a groove (13) on either side (4, 12) of the housing (2) or the cap (8). The filter cartridge according to features 2 and 7.

9. The groove (13) comprises an operating section (15) positioned to force rotational displacement of the cap (8) near the operating position, and a ventilation section (16) positioned to force axial displacement of the cap (8) toward the use position. The filter cartridge according to claim 8.

10. The groove (13) within the side surface (4, 12) has a helical arc cross section that simultaneously provides axial and rotational displacement of the cap (8) relative to the housing (2). The filter cartridge according to feature 9.

11. The operating opening (11) is located on the side (12) of the cap (8) adjacent to the closing side of the cap (8). The operating port (19) of the housing (2) is located within the housing end face (9) facing the cap (8). The outlet port (6) of the housing (2) is located within the housing end face (9) opposite to the housing end face (9) facing the cap (8). A filter cartridge according to any one of claims 4 to 10, characterized by the above.

12. The opening (20) is located inside the side (12) of the cap (8) opposite to the closed side of the cap (8). The inlet port (5) of the housing (2) is located on the side of the housing (2) such that the opening (20) of the cap (8) positioned at the usage location overlaps with the inlet port (5) of the housing (2), and the liquid passes into the housing (2) through the inlet port (5) that overlaps with the opening (20). A filter cartridge according to any one of claims 4 to 11.

13. The opening (20) is closed by the side (4) of the housing (2) between the operating position and the usage position. A filter cartridge according to any one of claims 4 to 12.

14. The cap (8) is provided with a handle (21) for manually displacing the cap (8) relative to the housing (2). A filter cartridge according to any one of claims 1 to 13, characterized by the above.

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