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Environmental air distribution control system powered by system pressure
| Details |
Inventors: Ley, Jr., Ralph M.; Alyea, Harold W.; Holloway, Thomas M.;
Assignee: Johnson Controls, Inc. (Milwaukee, WI)
Primary Examiner: Wayner; William E.
Assistant Examiner: Tapolcai, Jr.; William E.
Attorney, Agent or Firm: Emrich, Root, O'Keeffe & Lee
An environmental air distribution control system regulates the flow of air under pressure by using the system pressure itself to effect the desired control. This is accomplished by using one or more pressure regulating valves, each pressure regulating valve being adapted to selectively vary the pressure drop across its output impedance to thereby control the rate of flow of air. |
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DETAILED DESCRIPTION We claim as our invention the following: 1.
In an environmental control system including an air distribution duct having variable flow rates due to system variables, pressure regulating means for controlling the flow rate through said air duct comprising a pressure chamber disposed within said air duct between an inlet portion and an outlet portion thereof, said pressure chamber having an inlet communicating with said inlet portion of said air duct and an outlet with a fixed orifice communicating with said outlet portion of said air duct for permitting air flow through said chamber to establish a pressure in said chamber, reference means responsive to air flow through said duct to provide a substantially constant reference pressure, first means responsive to said constant reference pressure and to air flow through the inlet of said chamber for regulating air flow into said chamber for maintaining the pressure in said chamber substantially constant at a value which is established by said reference pressure to thereby maintain a constant flow rate through said fixed orifice, said reference means including second means for selectively varying said reference pressure in direct response to changes in the environmental temperature to thereby establish correspondingly different constant pressures in said chamber, whereby the rate of flow through said orifice is regulated in proportion to changes in temperature.
2.
An environmental control system as defined in claim 1 wherein said inlet is defined by at least one opening and said first means comprises a valve member disposed within said opening and actuator means for selectively varying the position of said valve member axially of said opening in direct response to changes in the ambient temperature to adjust the flow rate through said opening in proportion to changes in temperature.
3.
An environmental control system as defined in claim 2 wherein said actuator means comprises a flexible diaphragm envelope and a push rod interconnecting said diaphragm envelope and a push rod interconnecting said diaphragm envelope and said valve member
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