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Mixing box and control therefor

  • US 3,883,071 A
  • Filed: 12/18/1972
  • Issued: 05/13/1975
  • Est. Priority Date: 12/18/1972
  • Status: Expired due to Term
First Claim
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1. A mixing box defining a substantially closed passage for the flow of air from an inlet end to an outlet end thereof, nozzle means intermediate the inlet and outlet ends of the mixing box, there being three openings through which air can flow from the exteriOr of the mixing box into the closed passage, the openings being so positioned that air flowing through said nozzle means induces a flow of air from the exterior of the mixing box through the openings and into the closed passage, a damper for each of the openings, each of said dampers being movable between an open position in which it is ineffective, and a closed position in which it is effective, to prevent flow of air through the openings, means defining a by-pass passage through which air can flow from the inlet end to the outlet end of the mixing box without passing through said nozzle means, a by-pass damper movable between an open position in which it is ineffective, and a closed position in which it is effective, to prevent flow of air through the by-pass passage, at least one actuator for said dampers and for said by-pass damper, said by-pass damper and the actuator therefor being effective, in response to a control signal indicating an air conditioning load between a minimum and an intermediate magnitude, to close said by-pass damper and, in response to a control signal indicating an air conditioning load between the intermediate and a maximum magnitude, to move said by-pass damper toward an open position, said dampers and the actuator for each being effective, in response to a control signal indicating an air conditioning load above the intermediate magnitude to open a first one and to close the others of said dampers, and, in response to a signal indicating an air conditioning load between the minimum and the intermediate magnitude to move the first two of said dampers toward an open position and the third of said dampers toward a closed position.

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