AIR TEMPERATURE CONTROL SYSTEM

• US 3,640,455 A
• Filed: 02/06/1970
• Issued: 02/08/1972
• Est. Priority Date: 02/06/1970
• Status: Expired due to Term

• Current Assignee: Pat Romanelli
• Original Assignee: Pat Romanelli
• Inventors: Romanelli, Pat
• Primary Examiner(s): Michael, Edward J.
• Application Number:
  US05/009,339
• Time in Patent Office: 732 Days
• Field of Search: 236/1B,1C,11,74
• US Class Current: 236/49.3
• CPC Class Codes: F24F 11/76 by means responsive to temperature, e.g. bimetal springs
• CPC Class Codes: G05D 23/1919 characterised by the type of controller

Abstract

A multizone room air temperature control system comprises a thermostatically controlled louvered vent unit fitted to the mouth of the preexisting air duct register of the heating and air-conditioning system, in each room whose temperature is to be controlled. A continuously energized reversible shaded pole motor connected to the thermostat automatically opens and closes the vent louvres in response to room air temperature changes to thereby introduce or shut off the supply of either warm or cold air into the room for regulating the room air temperature independently of the other rooms.

Claims

1. An air temperature control system for individually controlling the air temperature of each of a plurality of rooms comprising at least one selectively operable air vent in each of said rooms connected to the mouth of a preexisting air duct providing a supply of air at a controlled temperature into each of said rooms respectively, thermostat means for sensing the air temperature in each of said rooms and for providing a first signal when the air temperature exceeds a first preselected temperature level and a second signal when said air temperature drops below a second preselected temperature level, and drive means comprising a continuously energized reversible electric motor operative in response to said first and second signals to selectively open and close said vents thereby controlling the flow of said temperature controlled air supply through said ducts into said rooms respectively to thereby maintain the air temperature in each of said rooms in the range between said first and second temperature levels, said motor including a rotor, main field winding means producing a continuous torque on said motor in one direction and a pair of shading coils producing a continuous torque greater than said main field winding torque on said rotor in a direction opposite to said one direction to produce a continuous net torque on said rotor in said opposite direction, means for applying said continuous net torque on said rotor to said air vent, and mechanical stop means to limit the travel of said air vent in response to the application thereto of said continuous net torque.

2. A control system according to claim 1 including means operative in response to said thermostat first signal to jumper said pair of shading coils to energize said shading coils and to produce a continuous net torque on said rotor in the direction of said shading coil torque, and means operative in response to said thermostat second signal to open circuit said shading coils to deenergize said shading coils to eliminate the shading coil field and to produce a continuous net torque on said rotor in the direction of said main field winding torque.

3. A control system according to claim 1 wherein said drive means includes a reducing gear train in operative engagement at one end thereof with said rotor, a drive shaft mounting a drive gear and a drive arm projecting perpendicularly from said drive shaft, gear reversing means coupling the other end of said gear train to said drive gear, said gear reversing means including selector means having first and second manually selectable positions, and operative for a constant direction of rotation of said rotor to selectively apply a clockwise drive to said drive gear when said selector means is in said first position and a counterclockwise drive to said drive gear when said selector means is in said second position, and pivot means at one end thereof engaging said drive arm and connected at the other end thereof to said vent to open and close said vent in response to rotation of said drive shaft.