Abstract: The present disclosure provides a filter adapter and a filter system, and further provides a specific filter installation method, which can achieve multiple guarantees to prevent liquid leakage during the disassembly and assembly of a filter. The filter adapter is configured to connect a connector base and a filter, and includes an adapter body, wherein the adapter body is provided with an accommodating cavity for accommodating a head of the filter, at least two shut-off valve passages are provided in the accommodating cavity, and at least two columnar shut-off valves configured to connect a fluid passage of the filter with a fluid passage of the connector base, wherein the at least two columnar shut-off valves axially move within the shut-off valve passages and are restricted from rotating.

Abstract: A connection structure for a filtration device, which relates to the field of filter technology, includes a main shell body, a mounting section and a switch section respectively assembled at two ends of the main shell body, and an installation section. When the switch section is toggled in one direction, the switch section drives the installation section to rotate and be inserted into a mounting hole on a refrigerator, an inlet and an outlet are correspondingly connected to a refrigerator pipeline, and water flows through the filtering component to filter out impurities. By using the above technical solution, the connection failure and water leakage issues are prevented and offering simple connection operation and quick assembly.