High efficiency heat generator

• US 8,826,561 B2
• Filed: 06/17/2010
• Issued: 09/09/2014
• Est. Priority Date: 06/17/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: COOL Dry, LLC
• Inventors: Wisherd, David S., Eisenberg, John A., D'Anna, Pablo E.
• Primary Examiner(s): Rinehart, Kenneth
• Assistant Examiner(s): MCCORMACK, JOHN PATRICK
• Application Number:
  US12/803,089
• Publication Number:
  US 20110308101A1
• Time in Patent Office: 1,545 Days
• Field of Search: 342/55, 34258-261, 34/88, 34/89, 342/46
• US Class Current: 34/255
• CPC Class Codes: D06F 2103/00 Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
• CPC Class Codes: D06F 2103/04 Quantity, e.g. weight or variation of weight
• CPC Class Codes: D06F 2103/08 Humidity
• CPC Class Codes: D06F 2103/12 Temperature
• CPC Class Codes: D06F 2103/38 Time, e.g. duration
• CPC Class Codes: D06F 2103/44 Current or voltage
• CPC Class Codes: D06F 2103/64 Radiation, e.g. microwaves
• CPC Class Codes: D06F 2105/00 Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
• CPC Class Codes: D06F 2105/28 Electric heating
• CPC Class Codes: D06F 2105/58 Indications or alarms to the control system or to the user
• CPC Class Codes: D06F 58/266 Microwave heating equipment
• CPC Class Codes: D06F 58/38 of drying, e.g. to achieve the target humidity
• CPC Class Codes: D06F 58/48 Control of the energy consumption
• CPC Class Codes: F26B 11/04 rotating about a horizontal or slightly-inclined axis F26B11/022, F26B11/024, F26B11/026, F26B11/028 take precedence
• CPC Class Codes: F26B 3/347 Electromagnetic heating, e.g. induction heating or heating using microwave energy
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

A method for heating a medium that includes an object having a variable weight is provided. The method comprises (A) placing medium including an object having variable weight into a variable enclosure having adjustable dimensions; (B) initiating a heating process by subjecting the medium including the object to a variable AC electrical field; (C) substantially continuously measuring an impedance of medium including the object during the heating process; (D) adjusting dimensions of said variable enclosure to optimize the heating process; (E) adjusting parameters of the variable AC electrical field to optimize the heating process; and (F) controlling the heating process.

Claims

1. A method for providing self-regulating capacitive electro-heating, said method comprising:

(A) applying a single RF frequency Waveform power source to a capacitor coupled to said RF frequency Waveform power source, said capacitor including a variable enclosure;

wherein a medium including an object having a variable weight is present in said variable enclosure and the single RF frequency is a frequency between 1 MHz and 250 MHz;

(B) adjusting dimensions of said variable enclosure to maximize electric field capacitive coupling to the object and minimize capacitive coupling to empty space;

(C) measuring an impedance of said variable enclosure including said object having variable weight; and

(D) adjusting parameters of said RF frequency Waveform power source based on said measured impedance of said variable enclosure including said object having variable weight.

2. The method of claim 1, wherein said step (A) further comprises:

(A1) selecting said object from the group consisting of;

a cloth substance;

a food substance;

a wood substance;

a plastic substance; and

a chemical substance.

3. The method of claim 1, wherein said step (A) further comprises:

(A2) selecting said medium from the group consisting of;

water;

liquid having a dielectric permittivity above a first predetermined threshold, and liquid having a dissipation factor above a second predetermined threshold.

4. The method of claim 1, wherein said step (A) further comprises:

(A3) selecting said variable enclosure from the group consisting of;

a drum having a variable thickness;

a drum having a variable surface;

a drum having a variable volume;

an enclosure having a variable thickness;

an enclosure having a variable surface; and

an enclosure having variable volume.

5. The method of claim 1;

wherein said variable enclosure comprises a dryer drum having an anode plate; and

wherein said object comprises a load of clothing; and

wherein said medium comprises water; and

wherein said step (B) further comprises;

(B

     1) using at least one side mounted rotating threaded rod to both move and support said anode plate.

6. The method of claim 1, wherein said variable enclosure comprises a dryer drum having an anode plate;

and wherein said object comprises a load of clothing; and

wherein said medium comprises water; and

wherein said step (B) further comprises;

(B2) using at least one push rod to both move and support said anode plate.

7. The method of claim 1, wherein said variable enclosure comprises a dryer drum having an anode plate;

and wherein said object comprises a load of clothing; and

wherein said medium comprises water; and

wherein said step (B) further comprises;

(B3) using at least one electromechanically driven push rod to both move and support said anode plate.

8. The method of claim 7, wherein said variable enclosure comprises a dryer drum having an anode plate;

and Wherein said object comprises a load of clothing; and

wherein said medium comprises water; and

wherein said step (B3) further comprises;

(B3,

     1) using at least one push rod to move said anode plate toward said load to minimize an RF load resistance at an RF feed point;

wherein a spacing distance between said anode plate and a fixed ground plate comprises a minimum width consistent with size and softness of said load materials.

9. The method of claim 7, wherein said variable enclosure comprises a dryer drum having an anode plate;

and wherein said object comprises a load of clothing; and

wherein said medium comprises water; and

wherein said step (B3) further comprises;

(B3,

     2) using at least one push rod to move said anode plate toward said load, wherein a variable tuning inductor is configured to tune out a reactance of said load resulting in said load having a substantially real value resistance.

10. The method of claim 1, wherein said step (C) further comprises:

(C1) measuring a set of parameters affecting said impedance of said object at at least one RF frequency, said set of parameters selected from the group consisting of;

temperature variations of said object within said variable enclosure;

moisture variations of said object within said variable enclosure;

dimension variations of said enclosure; and

weight variations of said object.

11. The method of claim 10;

wherein said step (C1) further comprises;

(C1,

     1) rotating said variable enclosure to optimize said set of parameters;

wherein said optimized set of parameters results in optimization of said capacitive electro-heating process.

12. The method of claim 10, wherein said variable enclosure comprises a dryer drum having an anode plate, and wherein said object comprises a load of clothing;

and wherein said medium comprises water; and

wherein said step (C1) further comprises;

(C1,

     2) rotating said drum, wherein a first rotation of said drum is configured to move said anode plate into said load for dielectric heating, and wherein a second rotation of said drum is configured to allow space for air flow to remove moisture from said heated clothes load.

13. The method of claim 1, wherein said step (D) further comprises:

(D1) selecting parameters of said single RF frequency Waveform power source from the group consisting of;

an applied RF voltage magnitude and envelope wave shape;

an applied RF current magnitude and envelope wave shape;

phase of RF voltage vs. current;

voltage standing wave ratio (VSWR); and

a single RF frequency.

14. The method of claim 1, wherein said step (D) further comprises

(D2) applying variable RF power to optimize said capacitive electro-heating process.

15. The method of claim 14, wherein said variable enclosure comprises a dryer drum having an anode plate, and wherein said object comprises a load of clothing;

wherein said step (D2) further comprises;

(D2,

     1) adjusting a level of said variable applied RF power based on said measured load resistance.

16. The method of claim 1, wherein said variable enclosure comprises a dryer drum having an anode plate, and wherein said object comprises a load of clothing;

and wherein said medium comprises water;

further comprising;

(E) pre-heating the air inside said dryer drum for better water evaporation from said load of clothing.

17. The method of claim 1, wherein said variable enclosure comprises a dryer drum having an anode plate, and wherein said object comprises a load of clothing;

and wherein said medium comprises water;

further comprising;

(F) optimizing said self-regulating capacitive electro-heating process by using a tuning inductor;

wherein said tuning inductor is selected from the group consisting of;

a variable spring-like RF tuning inductor;

a variable ferrite core tuning inductor; and

a roller coil tuning inductor.

18. Apparatus for providing self-regulating capacitive electro-heating, said apparatus comprising:

(A) means for applying a single RF frequency Waveform power source to a capacitor coupled to said RF frequency Waveform power source, said capacitor including a variable enclosure;

wherein a medium including an object having a variable weight is present in said variable enclosure and the single RF frequency is a frequency between 1 MHz and 250 MHz;

(B) means for adjusting dimensions of said variable enclosure to maximize electric field capacitive coupling to the object and minimize capacitive coupling to empty space;

(C) means for measuring an impedance of said object having variable weight; and

(D) means for adjusting parameters of said RF frequency Waveform power source based on said measured impedance of said object.