FLOW SURGE EQUIPMENT FOR DYNAMOELECTRIC MACHINE

• US 3,755,702 A
• Filed: 07/31/1972
• Issued: 08/28/1973
• Est. Priority Date: 07/31/1972
• Status: Expired due to Term

• Current Assignee: David M. Willyoung
• Original Assignee: David M. Willyoung
• Inventors: Willyoung, David M.
• Primary Examiner(s): Duggan, D. F.
• Application Number:
  US05/276,586
• Time in Patent Office: 393 Days
• Field of Search: 310/52-65
• US Class Current: 310/53
• CPC Class Codes: H02K 9/00 Arrangements for cooling or ventilating channels or ducts in parts of the magnetic circuit H02K1/20, H02K1/32; channels or ducts in or between conductors H02K3/22, H02K3/24
• CPC Class Codes: H02K 9/197 in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
• CPC Class Codes: H02K 9/24 Protection against failure of cooling arrangements, e.g. due to loss of cooling medium or due to interruption of the circulation of cooling medium
• CPC Class Codes: H02K 9/26 Structural association of machines with devices for cleaning or drying cooling medium, e.g. with filters

Abstract

In a dynamoelectric machine with liquid-cooled element there is provided, according to the present invention, means for forcing an increased quantity of liquid coolant through the liquid coolant system during brief periods of dynamoelectric machine transient overload as well as on a regular periodic basis. Two beneficial results are thereby obtained. First, the heat removal capability of the liquid coolant system is transiently increased permitting normal operation at higher levels of initial power density; second, the flow surge of liquid coolant tends to purge the liquid coolant system of foreign particles.

Claims

1. In a dynamoelectric machine including an outer casing and electrically conductive dynamoelectric machine parts contained therein having a liquid coolant distributed therethrough;

said dynamoelectric machine further including a liquid coolant system for circulating the liquid coolant through said dynamoelectric machine parts; and

flow surge means for providing a temporary flow surge of liquid coolant to said liquid coolant system, said flow surge means including;

a surge tank, interconnected with said liquid coolant system and containing a supply of liquid coolant at a higher pressure than the liquid coolant pressure in said liquid coolant system;

a valve, downstream from said surge tank and positioned between said surge tank and said liquid coolant system; and

, means for triggering said valve causing the liquid coolant in the surge tank to flow into said liquid coolant system in response to dynamoelectric machine overload conditions.

2. A dynamoelectric machine of the kind having a gas-tight outer casing which is supplied with a gas coolant therein and dynamoelectric machine parts within said gas-tight outer casing having a liquid coolant distributed therethrough, said dynamoelectric machine further including a liquid coolant system for circulating the liquid coolant through the dynamoelectric machine parts;

and flow surge means for providing a temporary flow surge of liquid coolant to said liquid coolant system, said flow surge means including;

a surge tank, interconnected with said liquid coolant system and containing a supply of liquid coolant at a higher pressure than the liquid coolant pressure in said liquid coolant system;

a valve, downstream from said surge tank and positioned between said surge tank and said liquid coolant system; and

, means for triggering said valve causing the liquid coolant in the surge tank to flow into said liquid coolant system.

3. The dynamoelectric machine as recited in claim 2 wherein the means for triggering said valve is responsive to dynamoelectric machine overload conditions.

4. The dynamoelectric machine as recited in claim 2 wherein teh means for triggering said valve is temperature responsive.

5. The dynamoelectric machine as recited in claim 4 wherein the temperature responsive means includes a thermocouple.

6. The dynamoelectric machine as recited in claim 2 wherein the means for triggering said valve is electrically responsive to armature current.

7. The dynamoelectric machine as recited in claim 2 wherein the means for triggering said valve is a timer.

8. The dynamoelectric machine as recited in claim 2 wherein the gas coolant is hydrogen.

9. The dynamoelectric machine as recited in claim 2 wherein the liquid coolant is water.

10. The dynamoelectric machine as recited in claim 2 wherein the liquid coolant system includes a storage tank, a pump, a heat exchanger and a check valve in series relationship with the liquid-cooled dynamoelectric machine parts.

11. The dynamoelectric machine as recited in claim 10 wherein the flow surge means is interconnected with the liquid coolant system between the check valve and the inlet end of the liquid-cooled dynamoeLectric machine parts.

12. The dynamoelectric machine as recited in claim 2 wherein the highest pressure in the liquid coolant system, within the dynamoelectric machine, is less than the lowest pressure in the gas coolant system for steady-state operation whereby any leakage which occurs will be of gas coolant into the liquid coolant system.

13. The dynamoelectric machine as recited in claim 12 wherein any gas leakage will be detected by a gas monitor and detection device connected to said liquid coolant system.

14. The dynamoelectric machine as recited in claim 2 wherein the liquid-cooled parts include armature windings.

15. The dynamoelectric machine as recited in claim 2 where the liquid-cooled parts are stator core elements.

16. The dynamoelectric machine as recited in claim 2 wherein the flow surge means further includes an auxiliary pump and a valve interconnected with said liquid coolant system on the upstream side of said surge tank.