Appliance for drying articles

• US 9,784,499 B2
• Filed: 08/23/2013
• Issued: 10/10/2017
• Est. Priority Date: 08/23/2013
• Status: Active Grant

• Current Assignee: Whirlpool Corporation
• Original Assignee: Whirlpool Corporation
• Inventors: Herman, Mark L., Peterman, Garry L., Rajendran, Arun
• Primary Examiner(s): Rinehart, Kenneth
• Assistant Examiner(s): Jones, Logan
• Application Number:
  US13/974,092
• Publication Number:
  US 20150052775A1
• Time in Patent Office: 1,509 Days
• CPC Class Codes: D06F 58/10 Drying cabinets or drying chambers having heating or ventilating means
• CPC Class Codes: D06F 58/266 Microwave heating equipment
• CPC Class Codes: F26B 3/34 by using electrical effects
• CPC Class Codes: F26B 3/347 Electromagnetic heating, e.g. induction heating or heating using microwave energy
• CPC Class Codes: H05B 6/54 Electrodes
• CPC Class Codes: H05B 6/62 Apparatus for specific applications

Abstract

A radio frequency (RF) laundry dryer includes, amongst other things, an RF generator, a drying surface and a Faraday cage enclosing the 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 from the Faraday cage 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.

Claims

1. A radio frequency (RF) clothes dryer comprising:

an RF generator;

an RF applicator having a coplanar anode and a cathode, the anode having a trunk from which multiple digits branch, the anode trunk having a first terminal electrically coupled to the RF generator, and the cathode having a trunk from which multiple digits branch, the cathode trunk having a second terminal and a third terminal, the second and third terminals electrically coupled to the RF generator;

a drying surface on which textiles are supported for drying, located relative to the RF applicator such that the drying surface lies within an e-field generated by the RF applicator; and

a Faraday cage enclosing the drying surface;

wherein the cathode encompasses the anode multiple digits, except for a space in the cathode defined by a gap in the cathode trunk through which the anode trunk extends to connect to the first terminal, to electrically shield the anode from the Faraday cage ensuring formation of an e-field between the anode and cathode instead of between the anode and the Faraday cage upon energizing the RF generator, wherein at least some of the anode multiple digits and the cathode multiple digits are interdigitated, and wherein the second and third terminals are at the gap.

2. The RF clothes dryer of claim 1 wherein the anode is spaced closer to the cathode than to the Faraday cage.

3. The RF clothes dryer of claim 1 wherein at least one of the digits of the cathode encompasses the anode digits.

4. The RF clothes dryer of claim 1 wherein the first terminal is electrically coupled to the RF generator and the second and third terminals are electrically coupled to ground.

5. The RF clothes dryer of claim 4 further comprising an impedance matching circuit electrically coupling the RF generator and the RE applicator.

6. The RF clothes dryer of claim 1 wherein the anode defines at least one of a linear tree structure or a circular tree structure.

7. The RF clothes dryer of claim 1 wherein the drying surface is a planar surface.

8. The RF clothes dryer of claim 7 wherein the planar surface is vertically spaced from the Faraday cage.