Appliance for drying articles

Patent metadata

Field	Value
Publication number	US-10837702-B2
Application number	US-201715685490-A
Country	US
Kind code	B2
Filing date	Aug 24, 2017
Priority date	Aug 23, 2013
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A radio frequency (RF) laundry dryer includes, amongst other things, an RF generator and a drying surface. The drying surface on which textiles are supported further includes an RF applicator having an anode and cathode coupled to the RF generator. At least a portion of the cathode substantially encompasses the anode to electrically shield the anode ensuring the formation of an e-field between the anode and cathode instead of the anode and the Faraday cage upon energizing the RF generator.

First claim

What is claimed is:

1. A radio frequency (RF) applicator comprising:
an anode having multiple digits extending from an anode trunk;
a cathode having multiple digits extending from a cathode trunk and a gap in the cathode trunk defining a space, the cathode encompassing the multiple digits of the anode;
a drying surface on which textiles are supported for drying, located relative to the anode and cathode such that the drying surface lies within an e-field generated between the anode and cathode; and
a cuboid Faraday cage enclosing the anode, cathode, and the drying surface;
wherein at least a subset of the anode digits and at least a subset of the cathode digits being interdigitated, and wherein the anode trunk passes through the space in the cathode.

2. The RF applicator of claim 1 wherein the drying surface is a planar surface.

3. The RF applicator of claim 1 wherein the anode is spaced closer to the cathode than to a Faraday cage.

4. The RF applicator of claim 1 wherein at least one of the digits of the cathode encompasses the anode digits.

5. The RF applicator of claim 1 wherein the anode digits branch from the anode trunk.

6. The RF applicator of claim 1 wherein the cathode digits branch from the cathode trunk.

7. The RF applicator of claim 1 wherein the anode has a first terminal at the space.

8. The RF applicator of claim 7 wherein the cathode has second and third terminals at the gap.

9. The RF applicator of claim 8 wherein the first terminal is electrically coupled to an RF generator and the second and third terminals are electrically coupled to ground.

10. The RF applicator of claim 9 further comprising an impedance matching circuit electrically coupling the RF generator and at least the anode.

11. The RF applicator of claim 1 wherein the anode defines at least one of a linear tree structure and a circular tree structure.

12. A method of drying clothes using an e-field generated between an anode and cathode of a radio frequency (RF) applicator, the method comprising:
applying an RF signal to the anode having multiple digits extending from an anode trunk to form an e-field between the anode and cathode, the cathode having multiple digits extending from a cathode trunk and a gap in the cathode trunk defining a space, the cathode encompassing the multiple digits of the anode, wherein at least a subset of the anode digits and at least a subset of the cathode digits being interdigitated, and wherein the anode trunk passes through the space in the cathode, such that a drying surface on which textiles are supported for drying lies within the e-field between the anode and cathode, and wherein the e-field is contained by a cuboid Faraday cage enclosing the anode, cathode, and the drying surface.

13. The method of claim 12 wherein applying the RF signal comprises supplying the RF signal to the anode trunk portion passing through the space.

14. The method of claim 13 further comprising grounding the portions of the cathode forming the gap.

15. The method of claim 14 further comprising arranging the RF applicator horizontally and vertically spacing the RF applicator from the Faraday cage.

16. The method of claim 15 wherein the anode is spaced closer to the cathode than to the Faraday cage.

17. The method of claim 12 further comprising generating an RF signal from an RF generator.

18. The method of claim 17 further comprising providing an impedance matching circuit electrically coupling the RF generator and the RF applicator.

19. The method of claim 12 wherein the anode defines at least one of a linear tree structure and a circular tree structure.

Assignees

• Whirlpool Co

Inventors

• Herman Mark L
• Peterman Garry L
• Rajendran Arun

Classifications

• F26B3/34 Primary

  by using electrical effects · CPC title

• D06F58/10 Primary

  Drying cabinets or drying chambers having heating or ventilating means · CPC title

• D06F58/266

  Microwave heating equipment · CPC title

• F26B3/347

  Electromagnetic heating, e.g. induction heating or heating using microwave energy · CPC title

• H05B6/62

  Apparatus for specific applications · CPC title