Abstract: A filter case that internally includes a filter element including a filtration member having a substantially cylindrical shape that filters the liquid and an inner tube having a substantially cylindrical shape provided inside the filtration member. The inner tube includes a partition plate that covers a hollow portion of a side surface. A heater provided on a bottom surface of the filter case includes a substantially rod-shaped heating unit. The heating unit is inserted into a space surrounded by the side surface and the partition plate of the inner tube via a first hole formed at a position overlapping with the hollow portion of the inner tube in the first plate that covers a lower end of the filtration member.

Abstract: An inner case being substantially cylindrical and being covered at an upper end is provided to cover a heater being substantially rod-shaped. A float being substantially plate-shaped and having substantially the same inner diameter as an inner diameter of the inner case is provided movably in the vertical direction in the inner case, and in the float, a hole through which the heater is inserted is formed. Gas is enclosed in a space surrounded by the inner case and the float. The length in the vertical direction of the inner case is smaller than the length in the vertical direction of the heater. In addition, when the float is positioned at a lower end of the inner case, a gap exists between the float and a bottom surface of a filter case.

Abstract: A liquid surface height inside a tank is allowed to be confirmed while blow-back of a liquid is reduced. A strainer body having a substantially bottomed tubular shape has a substantially D shape when viewed in a longitudinal direction. A bottom surface of the strainer body has a shape in which a part of a conical shape is cut away, and a top of the substantially conical shape overlaps with a notched portion notched to form the substantially D shape. The bottom surface protrudes toward an opening of the strainer body. A rod is provided adjacent to the notched portion of the strainer body, and a float is provided on a lower end of the rod.

Abstract: A filter case that internally includes a filter element including a filtration member having a substantially cylindrical shape that filters the liquid and an inner tube having a substantially cylindrical shape provided inside the filtration member. The inner tube includes a partition plate that covers a hollow portion of a side surface. A heater provided on a bottom surface of the filter case includes a substantially rod-shaped heating unit. The heating unit is inserted into a space surrounded by the side surface and the partition plate of the inner tube via a first hole formed at a position overlapping with the hollow portion of the inner tube in the first plate that covers a lower end of the filtration member.

Abstract: A liquid surface height inside a tank is allowed to be confirmed while blow-back of a liquid is reduced. A strainer body having a substantially bottomed tubular shape has a substantially D shape when viewed in a longitudinal direction. A bottom surface of the strainer body has a shape in which a part of a conical shape is cut away, and a top of the substantially conical shape overlaps with a notched portion notched to form the substantially D shape. The bottom surface protrudes toward an opening of the strainer body. A rod is provided adjacent to the notched portion of the strainer body, and a float is provided on a lower end of the rod.

Abstract: An inner case being substantially cylindrical and being covered at an upper end is provided to cover a heater being substantially rod-shaped. A float being substantially plate-shaped and having substantially the same inner diameter as an inner diameter of the inner case is provided movably in the vertical direction in the inner case, and in the float, a hole through which the heater is inserted is formed. Gas is enclosed in a space surrounded by the inner case and the float. The length in the vertical direction of the inner case is smaller than the length in the vertical direction of the heater. In addition, when the float is positioned at a lower end of the inner case, a gap exists between the float and a bottom surface of a filter case.