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Pneumatic temperature reset differential pressure controller
| Details |
Inventors: Ginn, LeRoy Dry; Ginn, LeRoyce Sloe; Travaglio, Dalny;
Assignee: Universal Pneumatic Controls, Inc. (Oakland, CA)
Primary Examiner: Wayner; William E.
Assistant Examiner: Tapolcai, Jr.; William E.
Attorney, Agent or Firm: Owen, Wickersham & Erickson
An air flow velocity controller in a variable air volume control system interlocks a room temperature signal from a thermostat with the velocity set point so that the velocity controller maintains a constantly regulated amount of air into a room in proportion to the room's thermostat demands and independent of variations in the static pressure in the duct. The controller includes a maximum lift cam and a movable spring fulcrum which are both mounted in a common cam housing to permit the maximum velocity setting to be adjusted for varying room requirements while maintaining a constant spring range regardless of the maximum velocity setting. The controller is constructed to provide automatic compensation for control offset produced by changes in the static air pressure in the duct. The controller includes the ability to control the air flow at a minimum velocity so that the air can be economically reheated or a minimum volume of air flow can be maintained for ventilation requirements. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A variable air volume control system constructed in accordance with one embodiment of the present invention is indicated generally by the reference numeral 21 in FIG.
1.
The system 21 comprises a duct 23, a fan 25, a regulator box 27 in the cut 23, and outlets 29 for conducting air from the duct 23 to a room 30.
In most installations the complete system 21 will include a number of branch ducts 23 with related regulator boxes 27 for supplying conditioned air to different zones of a building, but only a single branch duct and regulator box and related room or zone are shown in FIG.
1 in order to simplify the description of operation.
The volume of air flow through the regulator box 27 is controlled by a valve 31, and the valve 31 is moved in opening and closing directions by an air powered actuator 33.
In a specific embodiment of the present invention (as illustrated in FIG.
1) pneumatic air from a conduit 35 is used to power the actuator 33.
In accordance with the present invention a temperature reset differential pressure controller 41 controls the amount of air pressure transmitted from the air inlet line 35 (and through the outlet line 37 to the actuator 33) by controlled venting of the air pressure through a vent port 43.
The pressure in the actuator 33 is regulated by the controller 41 in response to air flow velocity in the duct 23 and in response to room air temperature in the room 30.
The air flow velocity may be sensed by a total pressure pick up probe 45 and a static air pressure pick up probe 47, as illustrated, or the air flow velocity may be sensed by any other suitable air flow velocity sensing means.
The room air temperature in the room 30 is sensed by a thermostat 49 (having an adjustment knob 51 for setting the set point of the thermostat).
The total pressure pick up probe 45 is connected to the controller 41 by a line 53, and the static pressure pick up probe 47 is connected to the controller 41 by a line 55.
The thermostat 49, in a specific embodiment of the present invention, is a direct acting thermostat which produces an output signal, typically in a five psi range, on a line 57 which connects the thermostat 49 to the controller 41
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Image Analysis 
