Methods and apparatuses for drying electronic devices

• US 9,683,780 B2
• Filed: 03/23/2015
• Issued: 06/20/2017
• 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:
  US14/665,008
• Publication Number:
  US 20150192362A1
• Time in Patent Office: 820 Days
• 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. An apparatus, comprising:

a convection chamber comprising a heater and a low-pressure chamber, the heater located in the convection chamber and configured for heating the low-pressure chamber, the low-pressure chamber located in the convection chamber and configured for receiving an electronic device, the low-pressure chamber being mated to the heater using a sealing means;

an evacuation port in the low-pressure chamber, the evacuation port connected to an evacuation means, the evacuation means adapted to decrease pressure within the low-pressure chamber by pulling air out of the low-pressure chamber;

a purging means for flushing, through a desiccator, air out of the low-pressure chamber; and

at least one three-way control valve for switching airflow from pushing air into the desiccator from the low-pressure chamber to pulling the air or moisture in the air from the desiccator to the atmosphere.

2. The apparatus of claim 1, comprising:

a controller connected to the evacuation means and to the heater, wherein the controller controls the evacuation means to decrease pressure within the low-pressure chamber.

3. The apparatus of claim 2, wherein the controller controls the heater to conductively add heat to the electronic device.

4. The apparatus of claim 3, wherein the controller controls the temperature of the heater to maintain a temperature at or above approximately 110 deg. F. and at or below approximately 120 deg. F.

5. The apparatus of claim 2, wherein the controller controls the evacuation means to decrease pressure within the low-pressure chamber multiple times, and wherein the pressure within the low-pressure chamber increases between successive decreases in pressure.

6. The apparatus of claim 5, 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 pressure at least in part due to the controller controlling the valve to increase pressure within the low-pressure chamber.

7. The apparatus of claim 2, comprising:

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

8. The apparatus of claim 7, wherein the controller controls the evacuation means to at least temporarily stop decreasing pressure within the low-pressure chamber when the rate at which the relative humidity changes is approximately zero.

9. The apparatus of claim 7, wherein humidity sensor detects maximum and minimum values of relative humidity as the evacuation means decreases pressure within the low-pressure chamber multiple times, and wherein the controller controls the evacuation means to at least temporarily stop decreasing pressure within the low-pressure chamber when the difference between successive maximum and minimum relative humidity values is equal to or less than a predetermined value.

10. The apparatus of claim 9, 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 pressure at least in part due to the controller controlling the valve to increase pressure within the low-pressure chamber;

wherein the controller controls the valve to equalize pressure between the interior of the low-pressure chamber and the outside of the low-pressure chamber.

11. The apparatus of claim 2, comprising:

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

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

12. The apparatus of claim 2, 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 temperature sensor.

13. The apparatus of claim 2, comprising:

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

14. The apparatus of claim 1, wherein the heater includes a platen with which the electronic device is in direct contact while moisture is moved from the interior of the electronic device to the exterior of the electronic device.

15. The apparatus of claim 14, wherein the controller controls the temperature of the platen to maintain a temperature at or above approximately 110 deg. F. and at or below approximately 120 deg. F.

16. The apparatus of claim 1, 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.

17. The apparatus of claim 1, wherein the sealing means comprises a sealing O-ring.

18. The apparatus of claim 1, wherein the low-pressure chamber is mated to the heater using the sealing means along a surface of the heater where the electronic device is in contact with the heater.

19. The apparatus of claim 1, wherein the electronic device is in contact with the heater.

20. The apparatus of claim 1, wherein the evacuation port is comprised in the heater.

21. The apparatus of claim 1, wherein the evacuation port is comprised in an area enclosed by the sealing means.

22. The apparatus of claim 1, further comprising a user interface, the user interface comprising at least one of an input device selection switch, a device selection indicator light, and a start-stop switch.

23. The apparatus of claim 1, wherein the heater further comprises a temperature feedback sensor.