Backup power system having improved cooling airflow and method of operation thereof

• US 5,977,644 A
• Filed: 08/26/1997
• Issued: 11/02/1999
• Est. Priority Date: 08/26/1997
• Status: Expired due to Fees

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Smith, William C.
• Primary Examiner(s): ENAD, ELVIN GENARGUE
• Application Number:
  US08/920,069
• Time in Patent Office: 798 Days
• Field of Search: 290/1 A, 290/1 R, 290/1 B, 181/202, 181/204, 123/2, 123/198 E, 123/204, 322/1, 322/40
• US Class Current: 290/1.00B
• CPC Class Codes: F02B 63/04 for electric generators
• CPC Class Codes: F02B 63/044 the engine-generator unit being placed on a frame or in an housing

Abstract

Backup power systems and methods of operation thereof. In one embodiment, a backup power system constructed according to the present invention includes: (1) an enclosure, (2) an engine, having an air inlet, located within the enclosure, (3) an alternator, coupled to and driven by the engine, that converts mechanical power derived from the engine into AC electrical power and (4) a baffle, located within the enclosure and about a portion of the engine to block direct fluid communication from within the alternator to within the engine, that guides cooling air received into the enclosure sequentially through the alternator to cool the alternator, around the baffle and the engine, through the air inlet and into the engine to cool the engine and through an outlet port of the baffle, the baffle thereby establishing a serial path within the enclosure for the cooling air.

Claims

1. A backup power system, comprising:

an enclosure;

an engine, having an air inlet, located within said enclosure;

an alternator, coupled to and driven by said engine, that converts mechanical power derived from said engine into AC electrical power; and

a baffle, located within said enclosure and about a portion of said engine to block direct fluid communication from within said alternator to within said engine, that guides cooling air received into said enclosure sequentially through said alternator to cool said alternator, around said baffle and said engine, through said air inlet and into said engine to cool said engine and through an outlet port of said baffle, said baffle thereby establishing a serial path within said enclosure for said cooling air.

2. The backup power system as recited in claim 1 further comprising a rectifier, coupled to an electrical output of said alternator, that converts said AC electrical power into DC electrical power, said baffle guiding said cooling air to cool said rectifier before guiding said cooling air through said alternator.

3. The backup power system as recited in claim 1 wherein said engine has a muffler located proximate said outlet port, engine exhaust expelled from said muffler mixing with cooling air expelled through said outlet port.

4. The backup power system as recited in claim 1 wherein said baffle forms a double wall with said enclosure to cause said cooling air to cool said enclosure.

5. The backup power system as recited in claim 1 wherein said cooling air is received through a single air intake in said enclosure.

6. The backup power system as recited in claim 1 wherein said baffle divides said enclosure into first and second compartments, said first compartment containing control circuitry and receiving said cooling air before said second compartment.

7. The backup power system as recited in claim 1 wherein said alternator is employed to power telecommunications equipment.

8. A method of cooling a backup power system, comprising the steps of:

receiving cooling air into an enclosure surrounding said backup power system;

next employing a baffle to guide said cooling air sequentially through an alternator within said enclosure to cool said alternator, said baffle located between said alternator and an engine coupled thereto to block direct fluid communication from within said alternator to within said engine;

next guiding said cooling air around said baffle and said engine with said baffle; and

next allowing said cooling air to enter an air inlet to cool said engine, said cooling air expelled from said engine through an outlet port of said baffle, said baffle thereby establishing a serial path within said enclosure for said cooling air.

9. The method as recited in claim 8 further comprising the step of cooling a rectifier within said enclosure before performing said step of next employing.

10. The method as recited in claim 8 wherein said engine has a muffler located proximate said outlet port, said step of next allowing comprising the step of mixing engine exhaust expelled from said muffler with cooling air expelled through said outlet port.

11. The method as recited in claim 8 wherein said baffle forms a double wall with said enclosure, said step of next guiding comprising the step of cooling said enclosure with said cooling air.

12. The method as recited in claim 8 wherein said step of receiving comprises the step of receiving said cooling air through a single air intake in said enclosure.

13. The method as recited in claim 8 wherein said baffle divides said enclosure into first and second compartments, said method comprising the step of receiving said cooling air into said first compartment to cool control circuitry therein before performing said step of next employing.

14. The method as recited in claim 8 further comprising the step of employing said alternator to power telecommunications equipment.

15. A pole-mountable backup power system for providing backup DC electrical power to telecommunications equipment, said backup power system comprising:

an enclosure;

an engine, having an air inlet and a muffler for expelling exhaust therefrom, located within said enclosure;

an alternator, coupled to and driven by said engine, that converts mechanical power derived from said engine into AC electrical power;

a rectifier, coupled to an electrical output of said alternator, that converts said AC electrical power into said DC electrical power; and

a baffle, located within said enclosure and about a portion of said engine to block direct fluid communication from within said alternator to within said engine, that guides cooling air received into said enclosure sequentially through said rectifier to cool said rectifier, through said alternator to cool said alternator, around said baffle and said engine, through said air inlet and into said engine to cool said engine and through an outlet port of said baffle proximate said muffler to mix said cooling air with said exhaust, said baffle thereby establishing a serial path within said enclosure for said cooling air.

16. The backup power system as recited in claim 15 wherein said baffle forms a double wall with said enclosure to cause said cooling air to cool said enclosure.

17. The backup power system as recited in claim 15 wherein said cooling air is received through a single air intake in said enclosure.

18. The backup power supply as recited in claim 15 wherein said engine has a single air inlet.

19. The backup power system as recited in claim 15 wherein said baffle divides said enclosure into first and second compartments, said first compartment containing control circuitry and receiving said cooling air before said second compartment.

20. The backup power system as recited in claim 15 further comprising a mounting bracket, coupled to said enclosure, that allows said backup power system to be mounted to a telephone pole.