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US 6,786,228 B2Granted
Air circuit with air economizing and memory
AssigneeParker-Hannifin Corporation
InventorWilliam V. Pabst
Life of this patent
Estimating the term…
Abstract
The invention is summarized as a method and apparatus for providing a memory function for an air economizing fluid pressure circuit. A latchable or detented valve is used to control an air circuit that defaults to permit the generation of vacuum pressure, but is also cable of ceasing the generation of vacuum pressure generation to air economize. The invention may also include blow off capability for the air circuit.
Claims15
A method of controlling air pressure, comprising:
- initiating fluid flow through a detented valve having retention capability of its last fluid flow state and through an electronically controllable valve coupled to a pressure actuator of a pressure controllable valve, thereby porting positive pressure through the pressure controllable valve to a vacuum generator;
- sensing air pressure generated by the vacuum generator that is coupled to an air circuit output;
- controlling the electronically controllable valve to deter fluid flow through the electronically controllable valve when the sensed air pressure generated by the vacuum generator reaches a threshold pressure.
An air circuit, comprising:
- a negative pressure generator, having a generator input port and a negative pressure port,
- a pressure controllable valve having, a pressure actuator, an input port coupled to a positive pressure source, and an output port coupled to the generator input port, the pressure actuator controlling the pressure controllable valve to deter fluid flow in a first state and permit fluid flow in a second state;
- a detented valve having, at least one actuator, an input port coupled to a positive pressure source, and an output port, the at least one actuator controlling the detented valve to deter fluid flow in a first state and allow fluid flow in a second state;
- an electronically controllable valve, having an electronic actuator, an input port coupled to the detented valve output port, and an output port coupled to the pressure actuator of the pressure controllable valve, the electronic actuator controlling the electronically controllable valve to allow fluid flow in a first state and deter fluid flow in a second state;
- and
- a pressure switch, having a pressure sense input coupled to the negative pressure port, and an electronic output coupled to the electronic actuator of the electronically controllable valve.
3 more elements
An air circuit, comprising:
- a negative pressure generator, having a generator input port and a negative pressure port,
- a pressure controllable two state valve having, a pressure actuator, an input port coupled to a positive pressure source, and an output port coupled to the generator input port, the pressure actuator controlling the pressure controllable two state valve to deter fluid flow in a first state and permit fluid flow in a second state;
- a detented two state valve having, at least one actuator, an input port coupled to a positive pressure source, and an output port, the at least one actuator controlling the detented two state valve to deter fluid flow in a first state and allow fluid flow in a second state;
- an electronically controllable two state valve, having an electronic actuator, an input port coupled to the detented two state valve output port, and an output port coupled to the pressure actuator of the pressure controllable two state valve, the electronic actuator controlling the electronically controllable two state valve to allow fluid flow in a first state and deter fluid flow in a second state;
- and
- a pressure switch, having a pressure sense input coupled to the negative pressure port, and an electronic output coupled to the electronic actuator of the electronically controllable two state valve.
3 more elements
Dependencies are inferred from the claim text.