Method for drying articles

• US 10,246,813 B2
• Filed: 01/09/2017
• Issued: 04/02/2019
• Est. Priority Date: 12/09/2013
• Status: Active Grant

• Current Assignee: Whirlpool Corporation
• Original Assignee: Whirlpool Corporation
• Inventors: Herman, Mark L., Peterman, Garry L.
• Primary Examiner(s): Paik, Sang Y
• Application Number:
  US15/401,138
• Publication Number:
  US 20170114494A1
• Time in Patent Office: 813 Days
• Field of Search: 219764-780
• CPC Class Codes: D06F 58/04 Details controlling or regulating devices D06F34/00
• 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

Abstract

A method for drying an article with a radio frequency (RF) applicator having anode elements and cathode elements includes capacitively coupling the anode elements, capacitively coupling the cathode elements, capactively coupling an anode element to a cathode element, and energizing the RF applicator to generate an RF field between anode and cathode elements wherein liquid residing within the field will be dielectrically heated.

Claims

1. A laundry drying applicator to dry an article, comprising:

a support element;

a first anode element and a first cathode element;

a second anode element capacitively coupled with the first anode element and operably separated by at least a portion of the support element, and having a first base from which extends a first plurality of teeth; and

a first plurality of tabs on at least some of the first plurality of teeth;

a second cathode element capacitively coupled with the first cathode element and operably separated by at least a portion of the support element and having a second base from which extends a second plurality of teeth and a second plurality of tabs on at least some of the second plurality of teeth wherein the first and second plurality of teeth are interdigitally arranged; and

a radio frequency (RF) generator coupled with the first anode element and the first cathode element and operable to energize the first anode element and the first cathode element;

wherein upon energization of the first anode element and the first cathode element by the RF generator, the capacitive coupling of the second anode element and the second cathode element generates a field of electromagnetic radiation (e-field) in the radio frequency spectrum, operable to dielectrically heat liquid within an article on the support element.

2. The laundry drying applicator of claim 1 wherein the energization of the first anode element and the first cathode element by the RF generator induces the energization between the first anode element and the second anode element, between the first cathode element and the second cathode element, and between the second anode element and the second cathode element.

3. The laundry drying applicator of claim 1 wherein the first and second plurality of tabs are offset from each other.

4. The laundry drying applicator of claim 1 wherein the support element comprises at least one of a bed or a rotatable drum disposed above the second anode element and the second cathode element.

5. The laundry drying applicator of claim 4 wherein a rotation of the rotatable drum is synchronized to the energization of the RF generator to correspond with at least one of alignment with at least one capacitive coupling, a tumble of the laundry, or a power requirement of the RF generator.

6. The laundry drying applicator of claim 4 wherein the RF generator operably rotates with the drum.

7. The laundry drying applicator of claim 4 wherein the e-field is located above at least a portion of an inner surface of the drum and the article is supported on the inner surface of the drum.

8. The laundry drying applicator of claim 4 wherein the RF generator is intermittently energizable.

9. The laundry drying applicator of claim 4 wherein the first anode element comprises an anode ring encircling a first radial segment of the drum, and the first cathode element comprises a cathode ring encircling a second radial segment of the drum, which is different from the first radial segment.

10. The laundry drying applicator of claim 9 wherein the first base is axially aligned with the first radial segment and the second base is axially aligned with the second radial segment.

11. The laundry drying applicator of claim 1 wherein at least one of the second anode element or the second cathode element are encapsulated within the support element.

12. The laundry drying applicator of claim 1 wherein the support element comprises at least a layer of insulating material.

13. The laundry drying applicator of claim 1 wherein the first base is centrally located relative to the second cathode element and the first plurality of teeth extends from both sides of the first base, and wherein the second base extends around the first plurality of teeth, such that the second plurality of teeth are interdigitally arranged with the both sides of the first plurality of teeth.

14. The laundry drying applicator of claim 1 wherein at least one corner of at least one of the first anode element, the second anode element, the first cathode element, the second cathode element, the first plurality of teeth, the second plurality of teeth, the first plurality of tabs, or the second plurality of tabs is rounded.

15. A method to dry an article with a radio frequency (RF) applicator having a first anode element, a second anode element having a first base from which extends a first plurality of teeth and a first plurality of tabs on at least some of the first plurality of teeth, a first cathode element, a second cathode element having a second base from which extends a second plurality of teeth and a second plurality of tabs on at least some of the second plurality of teeth, each second anode and second cathode elements supported on a support element, the method comprising:

capacitively coupling, through the support element, the first anode element to the second anode element and the first cathode element to the second cathode element;

capacitively coupling the second anode element to the second cathode element; and

energizing the RF applicator to energize the first anode element and the first cathode element, to generate a field of electromagnetic radiation (e-field) within a radio frequency spectrum between the second anode and second cathode elements;

wherein liquid in the article residing within the e-field will be dielectrically heated to effect a drying of the article.

16. The method of claim 15, wherein the energizing further includes energizing the RF applicator to energize the first anode element and the first cathode element, thereby inducing energization between the first anode element and the second anode element, and between the first cathode element and the second cathode element, to generate the e-field between the second anode and the second cathode elements.

17. The method of claim 15, further comprising moving the RF applicator during the energization of the RF applicator.

18. The method of claim 15 wherein the support element is in the shape of a rotatable drum and rotation of the drum is at a speed to effect a tumble motion of the article on the inner surface.

19. The method of claim 15 wherein the energizing further includes energizing the first anode element and the first cathode element, to generate an e-field between at least one of the first and second pluralities of teeth or the first and second pluralities of tabs.

20. The method of claim 15 wherein the energizing further includes energizing the first anode element and the first cathode element, to generate an e-field between the first and second pluralities of teeth and the first and second pluralities of tabs.