Filtering medium and air purifier

Patent metadata

Field	Value
Publication number	US-10168059-B2
Application number	US-201615228206-A
Country	US
Kind code	B2
Filing date	Aug 4, 2016
Priority date	Sep 11, 2015
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

A filtering medium includes a nonwoven fabric and a first electrode having an input terminal of power. The first electrode is provided on a surface of the nonwoven fabric. Alternatively, in a case where the nonwoven fabric has a plurality of fiber layers, the first electrode may be provided between the fiber layers. An air purifier includes the filtering medium disposed between a sucker and a discharger of a gas, and an output terminal via which power is output to the first electrode of the filtering medium.

First claim

What is claimed is:

1. A filtering medium comprising:
a nonwoven fabric; and
a first electrode provided on a surface of the nonwoven fabric,
wherein the first electrode has an input terminal of power,
wherein the nonwoven fabric includes a first fiber layer and a second fiber layer denser than the first fiber layer, and
wherein the nonwoven fabric further includes a third fiber layer that contains fibers having a fiber diameter smaller than a fiber diameter of fibers forming the second fiber layer, and is sandwiched between the first fiber layer and the second fiber layer.

2. The filtering medium according to claim 1 ,
wherein the first electrode has an open end.

3. The filtering medium according to claim 1 ,
wherein at least a part of the first electrode penetrates into voids of the nonwoven fabric from the surface of the nonwoven fabric.

4. The filtering medium according to claim 1 , further comprising:
a second electrode,
wherein the nonwoven fabric is sandwiched between the first electrode and the second electrode, and thus the first electrode and the second electrode are insulated from each other.

5. The filtering medium according to claim 4 , further comprising:
a frame fixing a periphery of the nonwoven fabric,
wherein the second electrode is fixed to the frame.

6. The filtering medium according to claim 1 ,
wherein the first electrode is provided on an outer surface of the second fiber layer.

7. The filtering medium according to claim 1 ,
wherein at least one of the first fiber layer and the second fiber layer contains fibers including at least one kind selected from the group consisting of polyolefin, polyester, polyamide, and cellulose.

8. A filtering medium comprising:
a laminated nonwoven fabric including a plurality of fiber layers; and
a first electrode provided between the plurality of fiber layers of the laminated nonwoven fabric,
wherein the plurality of fiber layers include a first fiber layer, and a second fiber layer denser than the first fiber layer, and
wherein the plurality of fiber layers further include a third fiber layer that contains fibers having a fiber diameter smaller than a fiber diameter of fibers forming the second fiber layer, and is sandwiched between the first fiber layer and the second fiber layer.

9. The filtering medium according to claim 8 ,
wherein the first electrode has an exposure exposed from the laminated nonwoven fabric, and
the input terminal is provided on the exposure.

10. The filtering medium according to claim 8 ,
wherein the first electrode has an open end.

11. The filtering medium according to claim 8 , further comprising:
a second electrode,
wherein at least one selected from the plurality of fiber layers is sandwiched between the first electrode and the second electrode, and thus the first electrode and the second electrode are insulated from each other.

12. The filtering medium according to claim 8 , further comprising:
a second electrode, and
a frame fixing a periphery of the laminated nonwoven fabric,
wherein the second electrode is fixed to the frame.

13. The filtering medium according to claim 8 , wherein the first electrode is sandwiched between the first fiber layer and the second fiber layer.

14. The filtering medium according to claim 8 , wherein the first electrode is sandwiched between the third fiber layer and the second fiber layer.

15. An air purifier comprising:
a sucker of a gas;
a discharger of the gas;
the filtering medium according to claim 1 disposed between the sucker and the discharger; and
an output terminal via which power is output to the first electrode.

16. An air purifier comprising:
a sucker of a gas;
a discharger of the gas;
the filtering medium according to claim 8 disposed between the sucker and the discharger; and
an output terminal via which power is output to the first electrode.

17. The filtering medium according to claim 1 , wherein the fibers of the third fiber layer have an average fiber diameter of less than 1 μm.

18. The filtering medium according to claim 1 , wherein:
the first fiber layer contains first fibers,
the second fiber layer contains second fibers, and
the third fiber layer includes a composite layer formed of the first fibers and third fibers.

19. The filtering medium according to claim 8 , wherein:
the plurality of fiber layers includes a first fiber layer, a second fiber layer, and a third fiber layer, and
the fibers of the third fiber layer have an average fiber diameter of less than 1 μm.

20. The filtering medium according to claim 8 , wherein:
the plurality of fiber layers includes a first fiber layer, a second fiber layer, and a third fiber layer,
the first fiber layer contains first fibers,
the second fiber layer contains second fibers, and
the third fiber layer includes a composite layer formed of the first fibers and third fibers.

21. The filtering medium according to claim 8 , wherein the first electrode has an input terminal of power, and wherein at least a part of the first electrode penetrates into voids of at least one selected from the plurality of fiber layers.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Yamaguchi Takayoshi
• Maeda Tadashi
• Wada Yosuke

Classifications

• B01D46/0032 Primary

  using electrostatic forces to remove particles, e.g. electret filters · CPC title

• F24F3/166 Primary

  Mechanical Engineering · mapped topic

• B01D46/521

  using folded, pleated material · CPC title

• B03C3/09 Primary

  characterised by presence of stationary flat electrodes arranged with their flat surfaces at right angles to the gas stream · CPC title

• B03C3/155

  Filtration · CPC title