Abstract A feedback apparatus for an automatic speed-governing system of a hydraulic turbine comprises a driving means which includes a control drum external of said turbine and having a cam-shaped control surface. The control drum is operatively connected with the servomotor of the system and is adapted for being linearly displaced relative to the servomotor, yet to be jointly rotated with the servomotor. The driving means comprises an output link and a distributing valve connected to the output link and which is adapted to direct pressurized control fluid into corresponding spaces of the servomotor. The operative connection between the control drum and the servomotor provides for a limited displacement of the control drum axially of said turbine in the course of the joint rotation of the control drum with the servomotor. An abutment system is carried on the turbine and against which the control drum is permanently biased. Also included is a sleeve constituting an intermediary link adjacent the control drum. A bearing system is provided for supporting the sleeve on the control drum for relative rotation therebetween. The sleeve is disposed for reciprocating motion axially of the turbine.
Feedback apparatus for an automatic speed-governing system of a hydraulic turbine having runner vanes and pivotally adjustable by a rotary servomotor, said apparatus comprising driving means including a control drum external of said turbine and having a cam-shaped control surface, said control drum being operatively connected with said servomotor and mounted for joint rotation therewith and linear displacement relative thereto, said control drum being adapted for transmitting linear displacements thereof to other links of said driving means said driving means comprising an output link and a distributing valve connected to said output link and adapted to direct pressurized control fluid into the corresponding spaces of said servomotor, said operative connection between said control drum and said servomotor providing for limited displacement of said control drum axially of said turbine in the course of said joint rotation of said control drum and said servomotor, abutment means carried by a stationary part of said turbine and against which said control drum is permanently biased, said driving means further including a sleeve constituting an intermediate link adjacent to said control drum, bearing means supported said sleeve on said control drum for relative rotation therebetween, said sleeve being disposed for reciprocating motion axially of saiD turbine, and guiding means associated with a stationary portion of said turbine for guiding the reciprocation of said sleeve.
Claim 2
Dependent Claim
220 words
Feedback apparatus for an automatic speed-governing system of a hydraulic turbine having runner vanes and pivotally adjustable by a rotary servomotor, said apparatus comprising driving means including a control drum external of said turbine and having a cam-shaped control surface, said control drum being operatively connected with said servomotor and mounted for joint rotation therewith and linear displacement relative thereto, said control drum being adapted for transmitting linear displacements thereof to other links of said driving means said driving means comprising an output link and a distributing valve connected to said output link and adapted to direct pressurized control fluid into the corresponding spaces of said servomotor, said operative connection between said control drum and said servomotor providing for limited displacement of said control drum axially of said turbine in the course of said joint rotation of said control drum and said servomotor, abutment means carried by a stationary part of said turbine and against which said control drum is permanently biased, said driving means further including a sleeve constituting an intermediate link adjacent to said control drum, bearing means supported said sleeve on said control drum for relative rotation therebetween, said sleeve being disposed for reciprocating motion axially of saiD turbine, and guiding means associated with a stationary portion of said turbine for guiding the reciprocation of said sleeve.
Claim 3
Dependent Claim
52 words
Feedback apparatus according to claim 1, including a tubular member and in which said control drum is slidably, nonrotatively connected by means of a key-and-slot connection to said tubular member, said tubular member being adapted to conduct said pressurized control fluid to said servomotor, said tubular member being connected with said servomotor.
Claim 4
Dependent Claim
28 words
Feedback apparatus according to claim 1, in which said abutment means engaged by said control drum includes at least one roller eccentrically mounted on an angularly adjustable member.