Methods and apparatuses for drying electronic devices

• US 9,644,891 B2
• Filed: 12/05/2016
• Issued: 05/09/2017
• Est. Priority Date: 02/01/2012
• Status: Active Grant

• Current Assignee: Revive Electronics, LLC
• Original Assignee: Revive Electronics, LLC
• Inventors: Trusty, Joel, Zielinski, Reuben
• Primary Examiner(s): GRAVINI, STEPHEN MICHAEL
• Application Number:
  US15/369,742
• Publication Number:
  US 20170082360A1
• Time in Patent Office: 155 Days
• Field of Search: 34 92, 34287
• CPC Class Codes: F26B 25/22 Controlling the drying process in dependence on liquid content of solid materials or objects
• CPC Class Codes: F26B 3/02 by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air F26B3/283 and F26B3/343 take precedence
• 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 9/06 in stationary drums or chambers

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 energy, such as by using a heated platen in contact with the electronic device or by supplying a gas (e.g., air), which may be heated, into the interior of the electronic device. Embodiments include heating the gas supplied into the interior of the electronic device with pump used to decrease pressure within the electronic device and/or a separate heater. Still other embodiments include controlling the temperature of the gas supplied into the electronic device. Still further embodiments automatically control, such as by using an electronic processor, some or all aspects of the drying of the electronic device.

Claims

1. A method, comprising:

placing a portable electronic device, that has been rendered at least partially inoperable due to moisture intrusion, into a low-pressure chamber;

heating the portable electronic device;

decreasing pressure within the low-pressure chamber;

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

increasing the pressure within the low-pressure chamber after the decreasing pressure, the increasing further comprising;

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

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

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

removing the portable electronic device from the low-pressure chamber.

2. The method of claim 1, wherein the placing includes placing the portable electronic device on a platen, the heating includes heating the platen to at least approximately 110 deg. F. and at most approximately 120 deg. F., and the decreasing pressure includes decreasing the pressure to at least approximately 28 inches of Hg below the pressure outside the low-pressure chamber.

3. The method of claim 1, wherein the placing includes placing the portable electronic device on a platen, and the heating includes heating the platen to at least approximately 110 deg. F. and at most approximately 120 deg. F.

4. The method of claim 1, wherein the decreasing pressure includes decreasing the pressure to at least approximately 28 inches of Hg below the pressure outside the low-pressure chamber.

5. The method of claim 1, comprising:

disinfecting the portable electronic device.

6. The method of claim 1, comprising:

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

7. The method of claim 1, wherein the decreasing pressure includes decreasing the pressure to at least approximately 30 inches of Hg below the pressure outside the low-pressure chamber.

8. The method of claim 1, comprising:

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

removing moisture, from gas being drawn from the low-pressure chamber with the pump, prior to the gas reaching the pump.

9. The method of claim 8, wherein the removing moisture includes removing the moisture using a desiccator containing desiccant.

10. The method of claim 9, comprising:

removing the moisture from the desiccant.

11. The method of claim 10, comprising:

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

12. The method of claim 1, wherein the decreasing pressure and increasing the pressure are repeated sequentially before the removing the portable electronic device.

13. The method of claim 12, comprising:

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

14. The method of claim 12, comprising:

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

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

15. An apparatus for:

a low-pressure chamber defining an interior and having the interior configured for placement of an electronic device in the interior and removal of the electronic device from the interior;

an evacuation pump connected to the low-pressure chamber;

a heater connected to the low-pressure chamber; and

a first controller connected to the evacuation pump and a second controller connected to the heater, the first controller controlling removal of moisture from the electronic device by controlling the evacuation pump to decrease pressure within the low-pressure chamber, and the second controller controlling operation of the heater to add heat to the electronic device.

16. An apparatus, comprising:

a low-pressure chamber defining an interior and having the interior sized and configured for placement of an electronic device in the interior and removal of the electronic device from the interior;

an evacuation pump connected to the low-pressure chamber;

a heater connected to the low-pressure chamber; and

a controller connected to the evacuation pump and to the heater, the controller controlling removal of moisture from the electronic device by controlling the evacuation pump to decrease pressure within the low-pressure chamber and controlling operation of the heater to add heat to the electronic device.

17. The apparatus of claim 16, wherein the controller controls the evacuation pump to decrease the pressure within the low-pressure chamber multiple times, and wherein the pressure within the low-pressure chamber increases between successive decreases in the pressure.

19. The apparatus of claim 16, comprising:

a pressure sensor connected to the low-pressure chamber and the controller, wherein the controller controls the evacuation pump to at least temporarily stop decreasing the pressure within the low-pressure chamber based at least in part on signals received from the pressure sensor.

20. The apparatus of claim 16, wherein the heater includes a platen with which the electronic device is in direct contact during removal of moisture from the electronic device.

21. The apparatus of claim 16, comprising:

a sterilizing member connected to the low-pressure chamber, the sterilizing member being configured and adapted to kill germs on an electronic device positioned within the low-pressure chamber.

22. The apparatus of claim 16, comprising:

a temperature sensor connected to the heater and the controller, wherein the controller controls the heater to maintain a predetermined temperature based at least in part on signals received from the pressure sensor.

23. The apparatus of claim 16, comprising:

a humidity sensor connected to the low-pressure chamber and the controller, wherein the controller controls the evacuation pump to at least temporarily stop decreasing the pressure within the low-pressure chamber based at least in part on signals received from the humidity sensor.

24. The apparatus of claim 23, wherein the controller controls the evacuation pump to at least temporarily stop decreasing the pressure within the low-pressure chamber when a rate at which relative humidity changes decreases or is approximately zero.

25. The apparatus of claim 23, wherein the humidity sensor detects maximum and minimum values of relative humidity as the evacuation pump decreases the pressure within the low-pressure chamber multiple times, and wherein the controller determines that the electronic device is dry when a difference between successive maximum and minimum relative humidity values is equal to or less than a predetermined value.

26. The apparatus of claim 16, comprising:

a humidity sensor connected to the low-pressure chamber and the controller,

wherein the controller controls the evacuation pump to begin decreasing the pressure within the low-pressure chamber when a rate at which relative humidity changes either decreases or is approximately zero.

27. The apparatus of claim 16, comprising:

a valve connected to the low-pressure chamber and the controller, wherein the pressure within the low-pressure chamber increases between successive decreases in the pressure at least in part due to the controller controlling the valve to increase the pressure.

28. The apparatus of claim 27, wherein the controller controls the valve to increase the pressure within the low-pressure chamber at approximately the same time the controller controls the evacuation pump to stop decreasing the pressure within the low-pressure chamber.

29. The apparatus of claim 26, wherein the controller controls a valve to equalize pressure between the interior of the low-pressure chamber and an outside of the low-pressure chamber.

18. A method for:

providing a low-pressure chamber defining an interior and having the interior configured for placement of an electronic device in the interior and removal of the electronic device from the interior;

providing an evacuation pump connected to the low-pressure chamber;

providing a heater connected to the low-pressure chamber; and

providing a controller connected to the evacuation pump and to the heater, the controller controlling removal of moisture from the electronic device by controlling the evacuation pump to decrease pressure within the low-pressure chamber and controlling operation of the heater to add heat to the electronic device.