Electricity: motive power systems – Constant motor current – load and/or torque control
Patent
1997-04-08
1999-03-30
Wysocki, Jonathan
Electricity: motive power systems
Constant motor current, load and/or torque control
318611, H02P 700
Patent
active
058893750
DESCRIPTION:
BRIEF SUMMARY
OBJECT OF THE INVENTION
As expressed in the title of this specification, the present invenion refers to a mechanical-kinetic instant retaining and limiting servomechanism of the torque transmitted from a shaft or input mechanism to an output, which, applied to operations of valves or other uses, makes it possible to control the problems of electronic or electronic signal delay and of accumulated inertia, even managaing to take advantage of them for other uses.
This invention is mainly developed directed towards bypass and fluid shutoff valves, where the variety of the same and circunstances of the process require certain characteristics. However, this does not mean that we limit the possible scope of application to sdaid field, but rather said invention or any dervivation of the same can be applied to any other technical field in which a limitation of torque transmitted with certain characteristics (explained hereinafter) is required.
Said servomechanism has a series of relevant and advantageous features with regard to other mechanism used at this time for the same purpose, and it has the following particularities:
a) The conversion of manual power (by means of a handwheel, lever, etc.) or electric, pneumatic, hydraulic (by means of cylinders, turbines or motors depending on the case) into mechanical power by adjusting and/or limiting the latter in a very precise manner.
This precision allows, whatever the speed is, not to exceed the specific pressure of the seat in seated valves and gate valves and, additionally, in the latter, not to creaqte any variablility in the shutoff valves.
B) The use of a gear planetary mechanism wherein the movement in which it enters through one of the center cams while the other one is braked, it comes out through the planetary member holder arm, or when the planetary member holder is braked it comes out through ones of the cams controlling the excess power.
Upon reaching a predetermined torque, the planetary member holder wheels stop or vice versa and the braked wheel is released, causing the applied power to be put off.
A shaft provided with thread or the like may be used. The shaft moves axially and acts on a truncated-cone shaped portion of the cam that causes the cutoff of the energy when a predetermined torque is exceeded.
As of then, it is possible that the power of the motor, as well as the associated kinetic and elastic energies, do not have any effect on the element on which said energies have been applied up to then.
This initially predetermined torque attained is the sum of a mechanical torque supplied by the motor, by the available kinetic torque due to the inertia of the motor itself and of the masses in movement, which makes it possible to apply much smaller motors; even to add additional inertia masses so as to increase said available kinetic energy.
C) The use of an auxiliary flywheel or lever, in the case of an emergency or for sporadic needs, in such a way that the normal energy supply has preference over the manual supply and with the particularity that the engaging and disengaging lever is not necessary, which not only avoids accidents due to lacks of synchronism, but rather it reduces critical emergency circumstances, idle times for preparing the operation.
D) The centrifugal clutch which, aside from having connected the flywheel in a state of rest of the motor, when the latter is connected the flywheel disconnects and goes to a dead point. The motor is connected with the input shaft of the planetary element of the mechanism almost at a rated speed.
D) Taking advantage of the centifugal clutch or similar centrifugal mechanism to achieve self-regulation of the locking of the torque limiting and regulating group. Thus it is achieved that in terms of the speed more or less torque is given in order to achieve the instant release of the circumstantially movable part.
E) Using a high yield irreversibility mechanism in those cases in which said irreversibility is not ensured in the rest of the actuator-valve mechanism, or in those cases in which it is desired t
REFERENCES:
patent: 5432422 (1995-07-01), Nagano et al.
patent: 5726520 (1998-03-01), Grahm
patent: 5791433 (1998-08-01), Murakami et al.
Centralair, S.A.
Wysocki Jonathan
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