Foreign substance removal apparatus, circulation system and vehicle cooling system

A foreign substance removal apparatus that removes foreign substances in a medium that flows through a circulation path, the foreign substance removal apparatus comprising:

• a foreign substance sedimentation unit which is connected to the circulation path and is configured to settle the foreign substances;
• a foreign substance separation unit configured to separate, from the foreign substance sedimentation unit, the foreign substances settled in the foreign substance sedimentation unit;
• first pressure open/close means which is disposed on a bottom of the foreign substance sedimentation unit, and is configured to open or close in accordance with pressure inside the circulation path;
• a foreign substance discharge pipe which connects the bottom of the foreign substance sedimentation unit and the foreign substance separation unit via the first pressure open/close means;
• second pressure open/close means which is disposed in an upper part of the foreign substance sedimentation unit and is configured to open/close in accordance with the pressure inside the circulation path;
• and a medium supply pipe which connects the foreign substance separation unit and the foreign substance sedimentation unit via the second pressure open/close means, wherein
• the foreign substances, which are settled in the foreign substance sedimentation unit, are separated in the foreign substance separation unit by the opening/closing of the first pressure open/close means,
• a part of the medium is stored in the foreign substance separation unit, and an outlet of the foreign substance discharge pipe is located in the stored medium,
• when the pressure inside the circulation path increases, the first pressure open/close means enters an open state, the medium in the foreign substance sedimentation unit is discharged to the foreign substance separation unit via the foreign substance discharge pipe, and then the first pressure open/close means enters a close state, and
• when the pressure inside the circulation path decreases, the second pressure open/close means enters an open state, and a part of the medium stored in the foreign substance separation unit is supplied to the foreign substance sedimentation unit via the medium supply pipe.