Filter

A filter for filtering fluids, comprising:

• a filter core, wherein the filter core of the filter has a filter element through which a fluid to be filtered passes to become filtered fluid;
• a top cover and a bottom cover, in which the top cover and the bottom cover are respectively fixed to an upper portion and a lower portion of the filter core;
• an inner wall surface of the filter core, an inner wall surface of the top cover, and an inner wall surface of the bottom cover that define a filter cavity that houses the filtered fluid, wherein the filter element has a filtration flow rate entering into the filter cavity;
• a first discharging pipe provided at the top cover and connected to a first discharge pumping device configured to apply negative pressure to the filter cavity, the first discharging pipe at least partially disposed within the filter cavity to form a first passageway to discharge at least a first part of the fluid from the filter cavity, wherein the first discharging pipe has a first inlet through which the fluid flows into the first discharging pipe from the filter cavity;
• a second discharging pipe provided at the top cover and connected to a second discharge pumping device configured to apply negative pressure to the filter cavity, the second discharging pipe at least partially disposed within the filter cavity to form a second passageway to discharge at least a second part of the fluid from the filter cavity, wherein the second discharging pipe has a second inlet through which the fluid flows into the second discharging pipe from the filter cavity, and wherein the first inlet and the second inlet are situated on different planes in a first direction.