Methods and apparatuses for drying electronic devices

• US 8,991,067 B2
• Filed: 02/01/2013
• Issued: 03/31/2015
• Est. Priority Date: 02/01/2012
• Status: Active Grant

• Current Assignee: Revive Electronics, LLC
• Original Assignee: Revive Electronics, LLC
• Inventors: Zielinski, Reuben Quincey, Trusty, Joel Christopher
• Primary Examiner(s): Lu, Jiping
• Application Number:
  US13/756,879
• Publication Number:
  US 20130192083A1
• Time in Patent Office: 788 Days
• Field of Search: 344/02, 344/03, 34405-408, 344/12, 344/13, 344/67, 344/72, 344/73, 344/74, 344/92
• US Class Current: 34/403
• CPC Class Codes: F26B 21/08 Humidity
• CPC Class Codes: F26B 21/083 by using sorbent or hygroscopic materials, e.g. chemical substances, molecular sieves
• CPC Class Codes: F26B 21/10 Temperature; Pressure F26B23/026 takes precedence
• CPC Class Codes: F26B 25/06 Chambers, containers, or receptacles large containers having means for heating, cooling, aerating or other conditioning of contents B65D88/74
• CPC Class Codes: F26B 25/14 Chambers, containers, receptacles of simple construction
• CPC Class Codes: F26B 25/22 Controlling the drying process in dependence on liquid content of solid materials or objects
• CPC Class Codes: F26B 3/00 Drying solid materials or objects by processes involving the application of heat in specific machines or apparatus F26B9/00 - F26B19/00
• CPC Class Codes: F26B 3/353 Resistance heating , e.g. using the materials or objects to be dried as an electrical resistance
• CPC Class Codes: F26B 5/04 by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum F26B11/049 and F26B17/128 take precedence
• CPC Class Codes: F26B 5/044 for drying materials in a batch operation in an enclosure having a plurality of shelves which may be heated F26B5/045 takes precedence
• CPC Class Codes: F26B 9/003 Small self-contained devices, e.g. portable

Abstract

Methods and apparatuses for drying electronic devices are disclosed. Embodiments include methods and apparatuses that heat and decrease pressure within the electronic device. Some embodiments increase and decrease pressure while adding heat. Other embodiments include a desiccator for removing moisture from the air being evacuated from the electronic device prior to the air reaching an evacuation pump. Further embodiments detect humidity within the low-pressure chamber and determine when to increase and/or decrease pressure based on the humidity. Still further embodiments determine that the device is sufficiently dry to restore proper function based on the detected humidity, and in some embodiments based on the changes in humidity while pressure is being increased and/or decreased. Still further alternate embodiments automatically control some or all aspects of the drying of the electronic device. Additional embodiment disinfect the electronic device.

Claims

1. A method, comprising the acts of:

placing a portable electronic device that has been rendered at least partially inoperable due to moisture intrusion into a low-pressure chamber and onto a heated conduction platen, wherein the heated conduction platen includes a platen in combination with a heater, wherein the portable electronic device is selected from the group consisting of cell phones, digital music players, watches, pagers, cameras, and tablet computers;

heating the portable electronic device;

decreasing pressure within the low-pressure chamber during said heating;

removing moisture from the interior of the portable electronic device to the exterior of the portable electronic device;

equalizing the pressure within the low-pressure chamber with the pressure outside the low-pressure chamber; and

removing the portable electronic device from the low-pressure chamber

wherein said heating includes controlling the temperature of the heated conduction platen in contact with the electronic device to maintain the temperature of the heated conduction platen at or above approximately 110 deg. F and at or below approximately 120 deg. F, and said decreasing pressure includes decreasing the pressure to approximately 28-30 inches of Hg below the pressure outside the chamber.

2. The method of claim 1, comprising:

increasing pressure within the low-pressure chamber after said decreasing pressure;

wherein said decreasing pressure and increasing pressure are repeated at least once before said equalizing the pressure and said removing the portable electronic device from the low-pressure chamber.

3. The method of claim 2, comprising:

automatically controlling said repeated decreasing pressure and increasing pressure according to at least one predetermined criterion.

4. The method of claim 2, comprising:

detecting when a sufficient amount of moisture has been removed from the electronic device; and

stopping the repeated decreasing pressure and increasing pressure after said detecting.

5. The method of claim 2, wherein said increasing pressure includes introducing ambient air into the low-pressure chamber.

6. The method of claim 1, comprising:

measuring the relative humidity within the low-pressure chamber; and

increasing pressure after the relative humidity has decreased and the rate of decrease of the relative humidity has slowed.

7. The method of claim 6, comprising:

decreasing pressure within the low-pressure chamber using a pump; and

removing moisture from the gas being drawn from the low-pressure chamber with the pump prior to the gas reaching the pump, said removing including absorbing moisture with a desiccant.

8. The method of claim 7, wherein the desiccant is contained in a desiccator and said removing moisture from the gas being drawn from the low-pressure chamber includes directing the airflow through the desiccator in a first direction, the method further comprising:

isolating the desiccant from the pump;

reversing the direction of airflow through the desiccator while removing moisture from the desiccant; and

removing moisture from the desiccant after said isolating.

9. The method of claim 1, comprising:

increasing pressure within the low-pressure chamber after said decreasing pressure, said increasing pressure includes introducing ambient air into the low-pressure chamber; and

measuring the relative humidity within the low-pressure chamber;

wherein said decreasing pressure and increasing pressure are repeated at least once before said removing the portable electronic device; and

wherein said decreasing pressure begins when the relative humidity has increased and the rate of increase of the relative humidity has slowed.

10. The method of claim 9, comprising:

decreasing pressure within the low-pressure chamber using a pump; and

removing moisture from the gas being drawn from the low-pressure chamber with the pump prior to the gas reaching the pump, said removing including absorbing moisture with a desiccant.

11. The method of claim 10, wherein the desiccant is contained in a desiccator and said removing moisture from the gas being drawn from the low-pressure chamber includes directing the airflow through the desiccator in a first direction, the method further comprising:

isolating the desiccant from the pump;

reversing the direction of airflow through the desiccator while removing moisture from the desiccant; and

removing moisture from the desiccant after said isolating.

12. The method of claim 1, comprising:

increasing pressure within the low-pressure chamber after said decreasing pressure, and

measuring the relative humidity within the low-pressure chamber;

wherein said decreasing pressure and increasing pressure are repeated at least once before said removing the portable electronic device; and

wherein said repeated decreasing pressure and increasing pressure is stopped once the difference between a sequential relative humidity maximum and relative humidity minimum are within a predetermined tolerance.

13. The method of claim 12, wherein said increasing pressure includes introducing ambient air into the low-pressure chamber.

14. The method of claim 13, comprising:

decreasing pressure within the low-pressure chamber using a pump; and

removing moisture from the gas being drawn from the low-pressure chamber with the pump prior to the gas reaching the pump, said removing including absorbing moisture with a desiccant.

15. The method of claim 14, wherein the desiccant is contained in a desiccator and said removing moisture from the gas being drawn from the low-pressure chamber includes directing the airflow through the desiccator in a first direction, the method further comprising:

isolating the desiccant from the pump;

reversing the direction of airflow through the desiccator while removing moisture from the desiccant; and

removing moisture from the desiccant after said isolating.

16. The method of claim 1, comprising:

increasing pressure within the low-pressure chamber after said decreasing pressure, said increasing pressure includes introducing ambient air into the low-pressure chamber; and

measuring the relative humidity within the low-pressure chamber;

wherein said decreasing pressure and increasing pressure are repeated at least once before said removing the portable electronic device; and

wherein said repeated decreasing pressure and increasing pressure is stopped once the relative humidity within the chamber reaches a predetermined value.

17. The method of claim 16, comprising:

decreasing pressure within the low-pressure chamber using a pump; and

removing moisture from the gas being drawn from the low-pressure chamber with the pump prior to the gas reaching the pump, said removing including absorbing moisture with a desiccant.

18. The method of claim 17, wherein the desiccant is contained in a desiccator and said act of removing moisture from the gas being drawn from the low-pressure chamber includes directing the airflow through the desiccator in a first direction, the method further comprising:

isolating the desiccant from the pump;

reversing the direction of airflow through the desiccator while removing moisture from the desiccant; and

removing moisture from the desiccant after said isolating.

19. The method of claim 1, comprising:

decreasing pressure within the low-pressure chamber using a pump; and

removing moisture from the gas being drawn from the chamber with the pump prior to the gas reaching the pump.

20. The method of claim 19, wherein said removing moisture from the gas being drawn from chamber includes absorbing moisture with a desiccant, the method further comprising:

removing moisture from the desiccant.

21. The method of claim 20, comprising:

isolating the desiccant from the pump prior to said removing moisture from the desiccant.

22. The method of claim 20, wherein the desiccant is contained in a desiccator, and wherein said removing moisture from the gas being drawn from the chamber includes directing the airflow through the desiccator in a first direction, the method further comprising:

reversing the direction of airflow through the desiccator while removing moisture from the desiccant.

23. The method of claim 20, wherein said removing moisture from the desiccant includes heating the desiccant to approximately 250 deg. F.

24. The method of claim 1, comprising:

disinfecting the electronic device.

25. The method of claim 1, comprising:

detecting when a sufficient amount of moisture has been removed from the electronic device.

26. The method of claim 1, comprising:

adding heat to the low-pressure chamber with the heated conduction platen in contact with the electronic device.

27. A method for removing moisture from the interior of a portable electronic device, comprising the acts of:

providing a low-pressure chamber having a heated conduction platen arranged therewithin;

providing a desiccator in fluid communication with the chamber and the desiccator;

providing a pump in fluid communication with the chamber;

placing upon said heated conduction platen the portable electronic device that has been rendered at least partially inoperable due to moisture intrusion, the portable electronic device being selected form the group consisting of cell phones, digital music players, watches, pagers, cameras, and tablet computers;

heating the electronic device conductively by heating said heated conduction platen;

controlling the heating of said heated conduction platen to maintain the temperature of the heated conduction platen within a range of about 110 degrees F. to about 120 degrees F.;

decreasing pressure within the chamber during said heating by drawing gas from within the chamber using said pump to approximately 28-30 inches of Hg below the pressure outside of said chamber;

removing moisture from the gas flow being drawn from within the chamber prior to the gas flow reaching said pump by directing said gas flow through said desiccator in a first direction;

removing moisture from the interior of the portable electronic device to the exterior of the portable electronic device;

increasing pressure within the chamber after said decreasing pressure, said increasing pressure including introducing ambient air into the low-pressure chamber;

measuring the relative humidity within the chamber;

equalizing the pressure within the chamber with the pressure outside of said chamber; and

decreasing pressure and increasing pressure within the chamber a least once until the difference between a sequential relative humidity maximum and relative humidity minimum are within a predetermined tolerance.

28. The method of claim 27, comprising:

isolating the desiccant from the pump; and

removing moisture from the desiccant after said isolating.

29. The method of claim 28, comprising:

reversing the direction of airflow through the desiccator during said removing moisture from the desiccant.

30. The method of claim 27, wherein the heated conduction platen includes a platen in combination with a heater.