SELF-POWERED VARIABLE VOLUME AIR DAMPER CONTROL

• US 3,809,314 A
• Filed: 03/21/1973
• Issued: 05/07/1974
• Est. Priority Date: 10/20/1971
• Status: Expired due to Term

• Current Assignee: Continental Manufacturing and Sales Incorporated
• Original Assignee: Marvin H. Zille, Roger P. Engelke
• Inventors: Engelke, Roger P., Zille, Marvin H.
• Primary Examiner(s): Wayner, William E.
• Assistant Examiner(s): Tapolcai, Jr., William E.
• Application Number:
  US05/343,219
• Time in Patent Office: 412 Days
• Field of Search: 236/49,80,82 98/1.5
• US Class Current: 236/49.4
• CPC Class Codes: F24F 11/74 for controlling air flow rate or air velocity
• CPC Class Codes: F24F 2110/30 Velocity
• CPC Class Codes: G05D 7/0193 using hydraulic or pneumatic amplifiers, relays or transmitters

Abstract

A self-powered control operates a damper to regulate volume flow of air from a duct into a conditioned space solely as a function of a sensed condition regardless of air supply pressure.

Claims

1. A volume control regulating volume flow of conditioned air into a controlled space in response to a condition sensor in said space, said control comprising a duct to deliver the conditioned air into said space, a damper regulating flow of the air through said duct, an actuator positioning said damper, an operator supplying a condition variable signal in response to said condition sensor, a flow detector supplying a continuous flow variable signal in response to flow of the conditioned air through the duct, means for combining said condition variable and flow variable signals to provide a single composite signal controlling said actuator, means for supplying air for operating the actuator, a restriction in said air supplying means, and means for controlling exhaust of the air from said actuator in response to said composite signal.

2. A volume control according to claim 1 wherein the air for operating the actuator is provided by a portion of said conditioned air.

3. A volume control according to claim 1 in which said operator, said detector and said exhaust control means are operated by pneumatic pressures.

4. A volume control according to claim 3 wherein the pneumatic pressures are provided by portions of said conditioned air.

5. A variable volume control according to claim 4 wherein said operator is a transducer converting said pneumatic pressure into a mechanical motion output in response to said condition sensor.

6. A volume control according to claim 5, said operator additionally comprising means for amplifying said motion.

7. A volume control according to claim 5, said operator additionally comprising resilient means for converting said motion into a mechanical force providing said condition variable signal.

8. A volume control according to claim 3 wherein said flow detector produces a flow variable mechanical force providing the flow variable signal.