Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS3024366 A
Publication typeGrant
Publication dateMar 6, 1962
Filing dateJun 11, 1958
Priority dateJun 11, 1958
Publication numberUS 3024366 A, US 3024366A, US-A-3024366, US3024366 A, US3024366A
InventorsMasanosuke Yanagimachi
Original AssigneeMasanosuke Yanagimachi
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electric generator system
US 3024366 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

March 6, 1962 MAsANosUKE YANAGIMACHI 3,024,366


MASANOSUKE YANAGiN/XCHL United States Patent Gfiiee 3,024,366 Patented Mar. 6, 1962 3,024,366 ELECTRIC GENERATOR SYSTEM Masanosuke Yanagimachi, 536 7-chome, Ebara, Shinagawa-ku, Tokyo, Japan Filed June 11, 1958, Ser. No. 741,249 6 Claims. (Cl. 290-2) This invention relates to an electric generator system.

In the prior art, electric generators have not been enclosed within a casing also enclosing a prime mover, due to the high electrical conductivity of the working substance, such as steam, for the prime mover. As a result, it has not been possible Ito effect a substantial reduction in the size of the overall electric generator system, and it has further been necessary to provide means for sealing the shaft of the prime mover which extends from the inside of the prime mover casing to the electric generator.

One object of this invention is to provide an electric generator and prime mover system which may be appreciably reduced in size.

Another object of this invention is to provide an electric generator which may be cooled easily and efficiently.

According Ito this invention, an electric generator is enclosed inside a casing together with a prime mover. The prime mover is an expanding fluid powered mechanism, such as a turbine in Which a working substance may be expanded so as to drive the electric generator. The working substance is a dielectric, such as a member of a group of fluorinated hydrocarbons, Vfor example, tri- Chloromonouoromethane commonly known by the trade name Freon-ll, the dielectric constant of vapor of which is 1.0019 (26 C., 0.5 atm.).

The invention will be better understood and other objects and additional advantages of this invention will become apparent upon perusal of the following description taken in connection with the drawing, and the scope of the invention will be defined in the appended claims.

In describing the invention, reference will be made to the single FIGURE of the accompanying drawing in which the single FIGURE is an axial sectional view of a unit comprising a prime mover and an electric generator embodying this invention, together with a diagrammatic layout of pipe lines ybelonging to the unit.

Referring to the drawing, a casing 1 encloses a vapor turbine E, as a prime mover, and an electric generator D. The rotor 2 of the turbine E and the rotor 3 of the electric generator D are secured on a common shaft 4 which is journaled rotatably inside the casing 1. An inlet for a working substance F, for example, Freon-ll, is provided through the wall of the casing 1 at the end thereof which faces the high pressure side of the turbine E, the low pressure side of the turbine E facing the electric generator D. Between the turbine E and the electric generator D, an outlet is provided through the wall of the casing 1 so as to exhaust the working substance F out ofthe casing 1. The exhausted working substance F is then admitted into a condenser C in which the same is cooled and condensed by cooling pipes 5. The liquefied working substance F is then delivered into a boiler B through a pump P. The boiler B vaporizes the Working substance F so as to feed the vapor into the inlet of turbine E.

In the past, hydrogen gas has been used to cool electric generators. According to this invention, the working substance such as Freon-ll may be substituted for the hydrogen gas to cool the electric generator D in the following easy and simplified manner. The pipe line to circulate the working substance F may have a branch extending from a point between the pump P and the boiler B and directed to an opening provided through the end wall of the casing 1 remote from the turbine E. A part of the working substance F pumped may be fed Iinto the electric generator D, being regulated by an expansion valve V provided in the branch line. The vapor of the working substance thus admitted inside the casing 1 at the end remote from the turbine E flows over the rotor 3 and the stator 6 of the electric generator D so as to cool the generator D. A fan 7 provided on the shaft 4 serves to exhaust the cooling vapor through the outlet, described hereinbefore, to the condenser C.

This invention may be adapted to a low-pressure cycle of a binary vapor cycle system for driving the electric generator. In such a case, the boiler B may be operated as a heat exchanger in which another working substance such as steam for the high-pressure cycle is condensed and the working substance such as Freon-ll for the lowpressure cycle is vaporised by the heat transferred from the condensing steam.

By virtue of the arrangement in accordance with this invention, it becomes possible to minimize the size of an electric generator system and eliminate the troublesome shaft seal problem. By virtue of the property of the specied working substance, the whole system may be kept thoroughly insulated electrically.

While particular embodiments of the invention have been illustra-ted and described, modifications thereof will readily occur to those skilled in the art. It should be understood therefore that the invention is not limited to the particular arrangements disclosed but that the appended claims are intended to cover all modifications which do not depart from the true spirit and scope of the invention.

What is claimed as newand desired to be secured by Letters Patent of the United States is:

l. An electric generator system comprising an electric generator; an expansible fluid powered engine drivingly connected to said generator; a single substantially sealed casing enclosing said generator and said engine and providing internal bearing support therefor; a fluid vaporzing means; an inlet in said casing adjacent said engine and connected to said vaporizing means to supply vaporized fluid to said engine to drive the latter by expansion of said fluid; an outlet in said casing in communication with said generator and said engine; condensing means connected to said outlet; and means connecting said condensing means to said vaporizing means, the expansible fluid being a dielectric uorinated hydrocarbon.

2. Electric generator system, according to claim 1, said working substance being trichloromonofluoromethane.

3. An electric generator system as claimed in claim l in which said casing has a second inlet adjacent said generator; a conduit having one end connected to the means connecting said condensing means to said vaporizing means and its other end connected to said second outlet; and an expansion valve in said conduit for expanding iinid from said condensing means into said casing to ilow through said generator to cool the same and to flow out of said outlet.

4. Electric generator system according to claim 3, said dielectric fluorinated hydrocarbon being trichloromonouoromethane.

5. An electric generator system as claimed in claim 3 in which said engine and said generator have a common drive shaft; and a fan mounted on said drive shaft between said engine and said generator, and effecting ow of expanded iiuid from said generator to said outlet.

3 4 6. Electric genera-tor according to clairn 5 said work- 1,741,605 Baumann Dec. 31, 1929 ing substance being trichloromonofiuoromethane. 2,411,347 Trumpler Nov. 19, 1946 2,452,581 Lehmann Nov. 2, 1948 References Cited in the le of this patent 2,495,745 Litton Jan, 31, 1950 UNITED STATES PATENTS 5 2,768,511 Moody OCt- 30, 1956 748,215 Porter et a1 Dec. 29, 1903

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US748215 *Sep 14, 1903Dec 29, 1903Edwin Hitchins PorterTurbine electric generator.
US1741605 *May 3, 1926Dec 31, 1929Bbc Brown Boveri & CiePower-plant installation
US2411347 *Nov 27, 1940Nov 19, 1946Carrier CorpRefrigerant vapor system
US2452581 *Jun 7, 1944Nov 2, 1948Standard Telephones Cables LtdTurbogenerator
US2495745 *Feb 20, 1946Jan 31, 1950Standard Telephones Cables LtdSmall turbine generator
US2768511 *Mar 21, 1955Oct 30, 1956Trane CoMotor compressor cooling in refrigerating apparatus
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3122894 *Jul 5, 1962Mar 3, 1964American Radiator & StandardHermetic motor cooling by direct expansion of system refrigerant into motor
US3177369 *May 2, 1961Apr 6, 1965Martin Marietta CorpCryogenic expander
US3216199 *May 15, 1962Nov 9, 1965United Aircraft CorpPower conversion system
US3684413 *Sep 24, 1969Aug 15, 1972Beloit CollegeEngine
US3783614 *Feb 10, 1972Jan 8, 1974H WalkerTurbine engine
US3816751 *Oct 30, 1972Jun 11, 1974Bbc Brown Boveri & CieApparatus for cooling an electrical generator
US3935488 *Oct 21, 1974Jan 27, 1976Siemens AktiengesellschaftMethod of operating a fluid-cooled hydropower generator
US4079263 *Mar 18, 1975Mar 14, 1978Inoue-Japan Research IncorporatedPower producing system
US4293777 *Jul 30, 1979Oct 6, 1981Joseph Gamell Industries, Inc.Turbo-electric power plant and process
US4301375 *Jan 2, 1980Nov 17, 1981Sea Solar Power, Inc.Turbo-generator unit and system
US4362020 *Feb 11, 1981Dec 7, 1982Mechanical Technology IncorporatedHermetic turbine generator
US4503682 *Mar 7, 1983Mar 12, 1985Synthetic SinkLow temperature engine system
US4513213 *Nov 4, 1982Apr 23, 1985Mitsubishi Denki Kabushiki KaishaPressure density equalizing apparatus for two vessels
US4577116 *Nov 14, 1983Mar 18, 1986The Boeing CompanySystem for providing electrical energy to a missile and the like
US4638173 *May 14, 1985Jan 20, 1987The United States Of America As Represented By The Secretary Of The NavyElectromechanical power source
US5118961 *Sep 14, 1990Jun 2, 1992S & W Holding, Inc.Turbine generator
US20130207396 *Dec 21, 2012Aug 15, 2013Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Power generation apparatus
EP0026584A1 *Sep 3, 1980Apr 8, 1981Robert Williams NeedhamImprovements in and relating to turbo electric generators
EP1821392A2 *Feb 20, 2007Aug 22, 2007Honeywell International, Inc.High power generator with enhanced heat removal
WO2014104294A1 *Dec 27, 2013Jul 3, 2014Mitsubishi Heavy Industries, Ltd.Power generation system, power generation method
U.S. Classification290/2, 62/505, 290/52, 310/55, 62/238.3, 62/238.4, 62/467
International ClassificationF01D15/10, F01D25/00, F01D15/00, F01D25/22
Cooperative ClassificationF01D15/10, F01D25/22
European ClassificationF01D25/22, F01D15/10