Filter device

Patent metadata

Field	Value
Publication number	US-11504661-B2
Application number	US-202016807941-A
Country	US
Kind code	B2
Filing date	Mar 3, 2020
Priority date	Oct 6, 2017
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

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.

First claim

The invention claimed is:

1. A filter device, comprising:
a filter case including an inflow portion and an outflow portion for liquid;
a filter element including a filtration material configured to filter the liquid and an inner cylinder having a cylindrical shape and disposed inside the filtration material, the filter element having a cylindrical shape covered at both ends, and the filter element being disposed inside the filter case to have a center axis extending in a vertical direction; and
a heater being rod-shaped and extending in the vertical direction inside the filter case, the heater being disposed outside the filter element, and a central axis of the heater is different from the central axis of the filter element in a plan view, wherein
the inner cylinder includes a side surface being cylindrical, and a partition plate being disposed between an upper end and a lower end of the filter element in a side view so as to divide an inner space of the inner cylinder into an upper hollow part and a lower hollow part in the side view, the partition plate covering the lower hollow part of the inner cylinder in the plan view,
a plurality of holes through which the liquid passes are formed at a first region positioned above the partition plate in the vertical direction in the side surface,
gas is enclosed in a space surrounded by a second region positioned below the partition plate in the vertical direction in the side surface and the partition plate, and
a gap exists between a lower end surface of the inner cylinder and a bottom surface of the filter case.

2. The filter device according to claim 1 , wherein
the filter element includes a first float provided movably in the vertical direction and having a diameter equal to an inner diameter of the inner cylinder,
the space in which the gas is enclosed is surrounded by the second region in the side surface, the partition plate and the first float, and
when the first float is positioned at a lower end, the first float is positioned at a lower end of the inner cylinder and a gap exists between the first float and the bottom surface.

3. The filter device according to claim 1 , wherein
the bottom surface is provided with a projection protruding inward of the inner cylinder, and
a gap exists between the projection and the inner cylinder.

4. The filter device according to claim 3 , wherein
the projection has a cylindrical shape covered at an end surface, and
the gap between the projection and the inner cylinder is not greater than half of a radius of the projection.

5. The filter device according to claim 1 , wherein
the filter device includes
an inner case being cylindrical and being covered at an upper end, the inner case being provided to cover the heater, and
a second float being plate-shaped and provided at a lower end of the inner case movably in the vertical direction, the second float having a diameter equal to an inner diameter of the inner case,
a hole through which the heater is inserted is formed in the second float, the hole having a diameter the same as a diameter of an outer shape of the heater,
gas is enclosed in a space surrounded by the inner case and the second float,
a length in the vertical direction of the inner case is smaller than a length in the vertical direction of the heater, and
when the second float is positioned at a lower end of the inner case, a gap exists between the second float and the bottom surface.

6. The filter device according to claim 1 , wherein
the filter case includes a first cylindrical portion extending in the vertical direction along the filter element, and a second cylindrical portion extending in the vertical direction along the heater, a diameter of the second cylindrical portion is smaller than a diameter of the first cylindrical portion, and
the first cylindrical portion and the second cylindrical portion are connected.

7. The filter device according to claim 5 , wherein,
in a plan view, the filter element and the inner case are provided adjacently,
the filter case includes a first cylindrical portion extending in the vertical direction along the filter element, and a second cylindrical portion extending in the vertical direction along the inner case,
a diameter of the second cylindrical portion is smaller than a diameter of the first cylindrical portion, and
the first cylindrical portion and the second cylindrical portion are connected.

8. The filter device according to claim 1 , wherein
the filter device includes an air vent including an air vent hole formed in an upper surface of the filter case and a valve provided below the air vent hole, and
the valve includes a float floating in the liquid.

9. The filter device according to claim 1 , wherein
the heater includes a pipe, and warms the liquid by an antifreeze solution that flows inside the pipe.

10. The filter device according to claim 1 , wherein
the filter element includes a cover plate covering the filtration material and an upper end of the inner cylinder,
the cover plate is disposed below an upper end surface of the filter case,
the outflow portion is disposed on the upper end surface of the filter case, and
a through-hole communicating an internal space of the inner cylinder with the outflow portion is formed in the cover plate, the through-hole including a portion having a truncated cone shape including an upper side having a smaller inner diameter than an inner diameter of a lower side.

11. The filter device according to claim 10 , wherein
a diameter of the cover plate is larger than a diameter of the filtration material, and
a ring having a cylindrical shape is provided below the cover plate and outside the filtration material.

12. The filter device according to claim 1 , wherein
a ring having a cylindrical shape is disposed below an upper end surface of the filter case and outside the heater.

Assignees

• Yamashin Filter Corp

Inventors

• NODOMI Youichi
• Kitajima Nobuyuki

Classifications

• B01D35/18

  Heating or cooling the filters · CPC title

• B01D2201/0415

  Details of supporting structures · CPC title

• B01D29/21

  with corrugated, folded or wound sheets · CPC title

• B01D2251/2067

  Urea · CPC title

• B01D35/0276

  Filtering elements with a vertical rotation or symmetry axis mounted on tanks or reservoirs · CPC title