US 6,681,797 B2 · Pressure transducer

Abstract

A pressure transducer for the production of a controlled under or overpressure comprises a valve to which compressed air can be applied, a motor for adjusting the position of the valve block, a sensor for measuring the pressure to be controlled and an electronic controller. The valve comprises a valve block working together with a valve seat. The rotational movement of the shaft of the motor is converted into a longitudinal movement of the valve block by means of a coupling. Between the shaft of the motor and the valve block, a spring is inserted which applies a mechanical load to the motor so that the motor does not reach the set speed given by the controller but turns slower. The load on the motor is dependent on the position of the valve block. For the controller, this is equivalent to a linearization of the characteristic curve of the regulated system.

Claims12

Dependent claims

Pressure transducer for producing a controlled pressure, comprising

a valve with an inlet for applying compressed air, the valve comprising a valve block and a valve seat,
a motor for adjusting the position of the valve block with regard to the valve seat,
means for transforming a rotating motion of a shaft of the motor into a longitudinal movement of the valve block,
a pressure sensor,
an electronic controller for regulating a direction of rotation and a speed of the motor based on a signal delivered by the pressure sensor and a set value for the pressure, and
a spring inserted between the shaft of the motor and the valve block for effecting a varying mechanical load on the motor in dependence on the position of the valve block, wherein an increasing mechanical load on the motor effects an increasing reduction in the speed of the motor in comparison with its speed in a no-load condition.

3 more elements

Dependencies are inferred from the claim text.

Pressure transducer

Life of this patent

Pressure transducer

Life of this patent

Abstract

Claims12