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US 4,037,619 AGranted
Three-point regulator with feedback
AssigneeSamson Apparatebau AG
InventorNorbert Jeschke
Life of this patent
Estimating the term…
Abstract
The specification describes a three-point regulator, for example of the pneumatic type, in the case of which with a drop and a rise in the measurement value of the regulation quantity after overcoming an operating distance a respective switch is operated. One switch is moved or turned by a servo-member (motor) in one direction and the other switch is moved or turned by the servo-member in the other direction. A feedback is provided which acts on both switches in such a manner that the operating distance is increased and accordingly the switched-on switch is switched off.
Claims4
A pneumatic regulator of the three-point type for regulating a flow of fluid, comprising:
- adjustable valve means for controlling the flow of fluid;
- means for controlling said adjustable valve means to maintain a predetermined fluid pressure in a pressure container connected in the fluid flow path, including first and second pneumatically-operated switches and a vane mounted therebetween to be movable from a neutral position, whereby movement of said vane in a first direction respectively opens and closes said first and second pneumatically-operated switches and movement in a second direction respectively closes and opens said first and second pneumatically-operated switches;
- said adjustable valve means increasing the fluid flow in response to said first pneumatically-operated switch being opened and decreasing the fluid flow in response to said second pneumatically-operated switch being opened;
- means for moving said vane in said first and second directions respectively in accordance with an increasing and decreasing pressure in said pressure container;
- feedback means responsive to said first or said second pneumatically-operated switch for moving said vane in a direction to close either said first or said second pneumatically-operated switch, whereby the distance said vane moves in either said first or said second direction to open or close said first and second pneumatically-operated switches is increased;
- said feedback means includes a stationary bellows and means for biasing and bellows in a neutral position, first and second microswitches respectively connected to said first and second pneumatically-operated switches and both said first and second microswitches being connected to said stationary bellows, and means for relieving the pressure within said stationary bellows;
- feed duct means for supplying air to said first and second microswitches;
- and
- said means for relieving includes a pre-choke valve connected to said first and second microswitches and to a first adjustable choke valve connected to said stationary bellows, and further including a second adjustable choke valve connected between said pre-choke valve and said first adjustable choke valve and open to the atmosphere.
6 more elements
A pneumatic regulator of the three-point type for regulating a flow of fluid, comprising:
- adjustable valve means for controlling the flow of fluid;
- means for controlling said adjustable valve means to maintain a predetermined fluid pressure in a pressure container connected in the fluid flow path, including first and second pneumatically-operated switches and a vane mounted therebetween to be movable from a neutral position, whereby movement of said vane in a first direction respectively opens and closes said first and second pneumatically-operated switches and movement in a second direction respectively closes and opens said first and second pneumatically-operated switches;
- said adjustable valve means increasing the fluid flow in response to said first pneumatically-operated switch being opened and decreasing the fluid flow in response to said second pneumatically-operated switch being opened;
- means for moving said vane in said first and second directions respectively in accordance with an increasing and decreasing pressure in said pressure container;
- feedback means responsive to said first or said second pneumatically-operated switch for moving said vane in a direction to close either said first or said second pneumatically-operated switch, whereby the distance said vane moves in either said first or said second direction to open or close said first and second pneumatically-operated switches is increased;
- said feedback means includes a stationary bellows and means for biasing said bellows in a neutral position, first and second microswitches respectively connected to said first and second pneumatically-operated switches and both said first and second microswitches being connected to said stationary bellows, and means for relieving the pressure within said stationary bellows;
- feed duct means for supplying air to said first and second microswitches;
- and
- each of said first and second pneumatically-operated switches include a jet nozzle for emitting a pneumatic flow and a receiving nozzle for receiving said pneumatic flow, said jet nozzle and said receiving nozzle of said first and second pneumatically-operated switches being respectively mounted in aligned spaced relationship, said vane is a planar member and said first and second directions are along an axis extending between said first and second pneumatically-operated switches in the plane of said vane, and the displacement of said vane by said feedback means is in a direction normal to said axis.
6 more elements
Dependencies are inferred from the claim text.