Cooling method and apparatus

• US 6,702,661 B1
• Filed: 11/25/2002
• Issued: 03/09/2004
• Est. Priority Date: 11/25/2002
• Status: Expired due to Term

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Samson, Larry, Pawlenko, Ivan, Clifton, Mark B.
• Primary Examiner(s): Lu, Jiping
• Application Number:
  US10/303,378
• Time in Patent Office: 470 Days
• Field of Search: 454/184, 361/695
• US Class Current: 454/184
• CPC Class Codes: H05K 7/20145 Means for directing air flow, e.g. ducts, deflectors, plenum or guides
• CPC Class Codes: H05K 7/20572 within cabinets for removing heat from sub-racks, e.g. plenum

Abstract

A cooling system of the invention can be used, for example, for cooling of electrical circuit boards housed in an equipment cabinet. The cooling system includes a flow-rate-amplifying pump configured to introduce ambient air into the cabinet. The pump is a passive device, which has a primary intake and a secondary intake and is designed to convert a small volume of compressed air applied to the secondary intake into a large flow of relatively cool ambient air into the cabinet through the primary intake. In one embodiment, the cooling system is designed to use the heat generated within the cabinet to produce compressed air. The air circulating around the circuit boards heats up and rises to the top of the cabinet, where it, is channeled toward an air vent. When the air exits through the vent, it rotates an appropriately placed propeller. The torque generated by the propeller is then used to drive an air compressor, the output of which is coupled to the secondary intake of the air amplifying pump. A cooling system of the invention can provide efficient cooling while generating less noise and/or electrical interference than prior art cooling systems.

Claims

1. A ventilated equipment cabinet for housing and cooling heat-generating electrical equipment, comprising:

(a) an enclosure adapted to house the electrical equipment and having one or more air vents; and

(b) a flow-rate-amplifying pump having a primary intake, a secondary intake, and an exhaust port, wherein;

the primary intake is connected to an opening in the enclosure;

the secondary intake is connected to receive compressed gas from a compressed-gas supply, such that, the compressed gas induces a flow of ambient air from the primary intake to the exhaust port; and

the exhaust port is configured to introduce the flow into the enclosure, such that the air heats up as it cools the electrical equipment and exits the enclosure through the one or more air vents.

2. The invention of claim 1, wherein the compressed-gas supply comprises a fan coupled to the secondary intake by a duct, wherein the fan is adapted to generate the compressed gas by inducing a pressure increase in the duct with respect to ambient pressure.

3. The invention of claim 1, wherein the cabinet is adapted to generate the compressed gas using heated air generated within the enclosure.

4. The invention of claim 3, wherein:

at least one air vent is configured with a movable part adapted to move in response to a flow of heated air exiting the enclosure through the vent; and

the compressed-gas supply comprises a compressor mechanically coupled to the movable part and adapted to generate the compressed gas using the motion of the movable part.

5. The invention of claim 4, wherein the enclosure comprises an air deflector adapted to direct the flow of heated air toward the vent.

6. The invention of claim 4, wherein the compressor has a mechanically actuated pump driven by the motion of the movable part.

7. The invention of claim 4, wherein:

the compressor has an electrical pump and an electrical generator;

the generator is adapted to generate electricity using the motion of the movable part; and

the electrical pump is configured to be powered by the electricity and adapted to generate the compressed gas.

8. The invention of claim 4, wherein:

the movable part comprises a propeller; and

the motion of the movable part is rotation of the propeller.

9. An apparatus adapted to ventilate the interior of an enclosure having one or more air vents, the apparatus comprising:

(a) a flow-rate-amplifying pump having a primary intake, a secondary intake, and an exhaust port, wherein;

the primary intake is adapted to be connected to an opening in the enclosure;

the secondary intake is adapted to be connected to receive compressed gas from a compressed-gas supply, such that, the compressed gas induces a flow of ambient air from the primary intake to the exhaust port; and

the exhaust port is configured to introduce the flow into the enclosure, such that the air heats up as it cools equipment housed in the enclosure and exits the enclosure through the one or more air vents; and

(b) the compressed-gas supply adapted to generate the compressed gas using heated air generated within the enclosure.

10. The invention of claim 9, wherein:

at least one air vent is configured with a movable part adapted to move in response to a flow of heated air exiting the enclosure through the vent; and

the compressed-gas supply comprises a compressor mechanically coupled to the movable part and adapted to generate the compressed gas using the motion of the movable part.

11. The invention of claim 10, wherein the compressor has a mechanically actuated pump driven by the motion of the movable part.

12. The invention of claim 10, wherein:

the compressor has an electrical pump and an electrical generator;

the generator is adapted to generate electricity using the motion of the movable part; and

the electrical pump is configured to be powered by the electricity and adapted to generate the compressed gas.

13. The invention of claim 12, wherein the electrical pump is adapted to be selectively powered by a battery to initiate the flow.

14. The invention of claim 10, wherein:

the movable part comprises a propeller; and

the motion of the movable part is rotation of the propeller.

15. A method of cooling heat-generating electrical equipment housed in a ventilated equipment cabinet, comprising applying compressed gas to a secondary intake of a flow-rate-amplifying pump, wherein:

the pump has a primary intake, the secondary intake, and an exhaust port;

the primary intake is connected to an opening in the enclosure;

the secondary intake is connected to receive compressed gas from a compressed-gas supply, such that, the compressed gas induces a flow of ambient air from the primary intake to the exhaust port; and

the exhaust port is configured to introduce the flow into the enclosure, such that the air heats up as it cools the electrical equipment and exits the enclosure through the one or more air vents.

16. The invention of claim 15, wherein the compressed-gas supply comprises a fan coupled to the secondary intake by a duct, wherein the fan generates the compressed gas by inducing a pressure increase in the duct with respect to ambient pressure.

17. The invention of claim 15, further comprising generating the compressed gas using heated air generated within the enclosure.

18. The invention of claim 17, wherein:

at least one air vent is configured with a movable part that moves in response to a flow of heated air exiting the enclosure through the vent; and

the compressed-gas supply comprises a compressor mechanically coupled to the movable part, wherein the compressor generates the compressed gas using the motion of the movable part.

19. The invention of claim 18, wherein the compressor has a mechanically actuated pump driven by the motion of the movable part.

20. The invention of claim 18, wherein:

the compressor has an electrical pump and an electrical generator;

the generator generates electricity using the motion of the movable part; and

the electrical pump is powered by the electricity and generates the compressed gas.