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1. (WO1979000928) METHOD OF CONTROLLING PUMPING WATER-WHEEL
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000928 International Application No.: PCT/JP1979/000084
Publication Date: 15.11.1979 International Filing Date: 05.04.1979
IPC:
F03B 15/06 (2006.01) ,F03B 15/12 (2006.01)
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
03
MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
B
MACHINES OR ENGINES FOR LIQUIDS
15
Controlling
02
by varying liquid flow
04
of turbines
06
Regulating, i.e. acting automatically
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
03
MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
B
MACHINES OR ENGINES FOR LIQUIDS
15
Controlling
02
by varying liquid flow
04
of turbines
06
Regulating, i.e. acting automatically
08
by speed, e.g. by measuring electric frequency or liquid flow
12
with retroactive action
Applicants:
Inventors:
Priority Data:
78/4465413.04.1978JP
Title (EN) METHOD OF CONTROLLING PUMPING WATER-WHEEL
(FR) METHODE DE COMMANDE D"UNE ROUE HYDRAULIQUE DE POMPAGE
Abstract:
(EN) A method of controlling a pumping water-wheel having S-shaped characteristic curve in its operating region. This invention intends to detect the behaviours of the operating point of the water-wheel in the S-shaped characteristic portion by the use of the number (N) of revolutions per unit time or acceleration (dN/dt) of the water-wheel. According to the present invention, the fact that the operating point of the water-wheel follows the S-shaped characteristic portion towards reduction of the flow rate is detected on the basis of the conditions where the acceleration dN/dt is substantially negative and the number (N) of revolutions per unit time is larger than a predetermined value, while the fact that the operating point of the water-wheel starts to follow the S-shaped characteristic portion towards increasing of the flow rate is detected on the basis of the condition where the number (N) of revolution per unit time becomes smaller than the predetermined value.
(FR) Methode de commande d"une roue hydraulique de pompage ayant une courbe caracteristique en S dans sa zone de fonctionnement. Cette invention a pour but de detecter les comportements du point de fonctionnement de la roue hydraulique dans la partie caracteristique en S en utilisant le nombre (N) de tours par unite de temps ou l"acceleration (dN/dt) de la roue hydraulique. Selon la presente invention, le fait que le point de fonctionnement de la roue hydraulique suive la partie caracteristique en S vers la reduction de la vitesse de debit est detecte dans des conditions ou l"acceleration dN/dt est substantiellement negative et le nombre (N) de tours par unite de temps est plus grand qu"une valeur predeterminee, et le fait que le point de fonctionnement de la roue hydraulique commence a suivre la partie caracteristique en S vers l"augmentation de la vitesse du debit est detecte dans des conditions ou le nombre (N) de tours par unite de temps devient plus petit que la valeur predeterminee.
Designated States:
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
US4354800