Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-06-08
2000-02-22
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
310 54, 310 64, 310 59, 415177, 290 52, 60912, H02K 918
Patent
active
060283807
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an improved arrangement in a bulb generator, comprising a generator housing arranged in a water flow which flows therealong and towards the turbine, which arrangement comprises means for removing surplus heat generated during operation of the generator, which means comprise elements which are assembled as flow channels for coolant and/or heated generator air for indirect or direct cooling of the generator air
PRIOR ART
A known technique for cooling bulb generators comprises water/air-heat exchangers located in the generator housing or bulb, the water being supplied from outside via pipes down the access shaft of the generator. Such an arrangement is often hampered with problems, inter alia because filters are required due to the quality of the river water.
It has also been suggested to use the bulb wall as a heat exchanger in order to avoid said problems. In such an arrangement the bulb wall is made double in the conical part of the nose portion, such that there is provided a water/water exchanger ("double skin cooler"). The water in the intermediate spacing is circulated by means of pumps through the conventional water/air exchanger. Even if such a prior art system may operate well, it is hampered with certain weaknesses especially as regards costly extra expenditures including comprehensive welding work, expensive materials, etc., the heat resistance through the bulb wall being relatively large. The requirement for necessary cooling surface will therefor influence the dimensions of the nose portion of the bulb or generator housing.
NO 155.305 (SA Alsthom-Atlantique) refers to an immersed apparatus encapsuled in a housing, wherein the outer cooling takes place by means of cooling pipes through which are circulated cooling air, which cooling pipes are provided on the outside of the generator housing in order to allow cooling of the coolant gas by means of the water flowing through the water channel.
U.S. Pat. No. 4,524,285 (Rauch) refers to a hydro dynamic device, comprising a first pipe-shaped housing, a second housing having a conical front portion provided inside the first housing, and holding an electrical generator, as well as a third housing being designed with a conical portion opposite of that of the second housing. Through said first housing water is flowing along the outer surface of the second housing, which water is driving a turbine and contributes to the removal of heat generated by the generator.
U.S. Pat. No. 5,333,680 (Sinhuber/Elin Energieversorgung GmbH) refers to a cooling system for a generator being installed in a chamber which is surrounded by flowing water, the walls of the chamber being manufactured from plate metal, and said walls of the chamber in the direction of the water flow being designed as a cooling radiator provided substantially as a double wall ("double jacket cooler") including channel-like cooling pockets wherein the secondary coolant can flow and by appropriate control be used for cooling the generator air.
EP 0.581-841 (Reitinger/Elin Energieversorgung GmbH) relates to a bulb generator having separate cooled, static converting elements residing in the nose portion of the turbine housing, and being cooled indirectly by the water flowing therearound.
U.S. Pat. No. 3,936,681 refers to a cooling aggregate for an electrical generator, wherein is maintained an arched forward portion of the turbine housing, said arched outer wall being provided with a plurality of short hook-like cooling fins. The purpose of the short, hook-shaped cooling fins is to facilitate the adaption to the arched (non-contoured) portions of the bulb.
Consequently, according to these publications it is not a token about preferably "longitudinal" and "straight" and double contoured extruded elements which are to be included as cooling elements in a bulb generator, i.e. especially by letting the outer surfaces comprise outer grooves having a favourable flow characteristics.
NO 81.871 relates to elements in a heat exchanger of the plate type, w
REFERENCES:
patent: 2801821 (1957-08-01), Burger
patent: 3081824 (1963-03-01), Macall
patent: 3229130 (1966-01-01), Drouard
patent: 3936681 (1976-02-01), Liebe
patent: 4308464 (1981-12-01), Yamamoto
patent: 4445046 (1984-04-01), Allegre et al.
patent: 4524285 (1985-06-01), Rauch
patent: 5101128 (1992-03-01), Veronesi et al.
patent: 5333680 (1994-08-01), Sinhuber
patent: 5568781 (1996-10-01), Vaillancourt et al.
Gevelt Bj.o slashed.rn
Oftedal K.ang.re Olaf
ABB Kraft AS
Mullins B.
Ramirez Nestor
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