Explosion-proof enclosures with active thermal management by heat exchange

• US 9,863,718 B2
• Filed: 02/01/2016
• Issued: 01/09/2018
• Est. Priority Date: 05/14/2009
• Status: Active Grant

• Current Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Original Assignee: Cooper Technologies Company (Eaton Corporation PLC.)
• Inventors: Manahan, Joseph Michael, Kozlowski, Marc Raymond
• Primary Examiner(s): Hwu, Davis
• Application Number:
  US15/012,583
• Publication Number:
  US 20160223271A1
• Time in Patent Office: 708 Days
• Field of Search: 165201, 169 48, 169 49
• CPC Class Codes: F28D 15/00 Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies F28D17/00, F28D19/00, F28D20/00 take precedence
• CPC Class Codes: F28D 2021/0029 Heat sinks
• CPC Class Codes: F28D 2021/0077 for tempering, e.g. with cooling or heating circuits for temperature control of elements
• CPC Class Codes: F28F 9/001 Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
• CPC Class Codes: H02K 5/136 explosion-proof
• CPC Class Codes: H05K 7/202 Air circulating in closed loop within enclosure wherein heat is removed through heat-exchangers

Abstract

Enclosures for use in hazardous areas include heat exchangers for active thermal management. The enclosures are coupled to a device having heat transfer capabilities. Equipment within the enclosures produces heat within the enclosure. The heat exchanger removes heat produced from the equipment and manages the internal temperature of the enclosures to a level suitable for hazardous locations. The enclosures can be actively cooled or heated using the device.

Claims

1. An explosion-proof enclosure system, comprising:

a housing comprising at least one housing wall that forms a first cavity, wherein the housing is sealed in compliance with hazardous area guidelines;

equipment positioned within the first cavity, wherein the equipment malfunctions when operating in extreme temperatures;

a thermally conductive plate disposed within the first cavity and positioned in thermal communication with the equipment;

a heat exchanger disposed exterior to the housing; and

at least one pipe disposed in the at least one housing wall, wherein the at least one pipe comprises a first end and a second end, wherein the first end of the at least one pipe is coupled to the thermally conductive plate, wherein the second end of the at least one pipe is coupled to the heat exchanger, and wherein the at least one pipe forms a flame path with the at least one wall so that the housing remains in compliance with the hazardous area guidelines.

2. The system of claim 1, wherein the at least one pipe is spiral.

3. The system of claim 1, wherein the thermally conductive plate comprises multiple plates in thermal communication with each other.

4. The system of claim 1, wherein the equipment is heated by the heat exchanger.

5. The system of claim 1, wherein the at least one tube traverses a length of the thermally conductive plate at least one time.

6. The system of claim 1, further comprising a fan positioned within the first cavity of the housing.

7. The system of claim 6, further comprising a control system coupled to the fan, wherein the control system controls operation of the fan.

8. The system of claim 7, wherein the control system is further coupled to the heat exchanger, wherein the control system further controls operation of the heat exchanger.

9. The system of claim 1, wherein the thermally conductive plate comprises at least one plate wall that forms a second cavity.

10. The system of claim 9, wherein the at least one plate wall of the thermally conductive plate has at least one opening for receiving the at least one pipe.

11. The system of claim 10, further comprising a fluid flowing through the at least one pipe and between the second cavity of the thermally conductive plate and the heat exchanger.

12. The system of claim 11, wherein the at least one pipe comprises an inlet pipe and an outlet pipe.

13. The system of claim 12, wherein the fluid flows in a closed loop from the heat exchanger to the inlet pipe to the second cavity of the thermally conductive plate to the outlet pipe and back to the heat exchanger.

14. The system of claim 1, wherein the equipment is cooled by the heat exchanger.

15. The system of claim 1, further comprising a fan externally mounted to the housing and directed toward the heat exchanger.

16. The system of claim 1, wherein the thermally conductive plate is further in thermal communication with the at least one housing wall.

17. The system of claim 8, further comprising a sensor that measures a parameter within the first cavity of the housing, wherein the control system controls the operation of the heat exchanger when the parameter measured by the sensor outside of a range of acceptable values.

18. The system of claim 17, wherein the parameter is a temperature within the first cavity.

19. The system of claim 17, wherein the parameter is a relative humidity within the first cavity.

20. The system of claim 17, wherein the parameter is a pressure within the first cavity.