Method and apparatus for controlling air flow in a structure

• US 5,810,245 A
• Filed: 07/11/1997
• Issued: 09/22/1998
• Est. Priority Date: 07/11/1997
• Status: Expired due to Fees

• Current Assignee: Ezell, George D., Heitman, Lynn Byron
• Original Assignee: Ezell, George D., Heitman, Lynn Byron
• Inventors: Ezell, George D., Heitman, Lynn Byron
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US08/893,850
• Time in Patent Office: 438 Days
• Field of Search: 236/49.3, 236/51, 236/78 C, 165/217, 165/208, 251/129.11
• US Class Current: 236/49.3
• CPC Class Codes: F24F 11/54 using one central controller connected to several sub-controllers
• CPC Class Codes: F24F 11/56 Remote control
• CPC Class Codes: F24F 11/70 Control systems characterised by their outputs; Constructional details thereof
• CPC Class Codes: F24F 11/74 for controlling air flow rate or air velocity
• CPC Class Codes: G05D 23/1934 each space being provided with one sensor acting on one or more control means

Abstract

Flow control valves (19) are provided and interfaced with the HVAC ducts (14) at the efferent ends (16) in adjoining rooms of a structure. A flow control command device (29), mounted on the wall of the structure (25), is provided to control the flow of air through the HVAC ducts (14) in response to flow control commands. Flow control commands are transmitted by wireless means to the command decoder (22) and converted to flow control signals. A flow control signal bus (21) is provided to connect the flow control signals to the flow control valves (19). A master thermostat (32) is connected directly to the HVAC system (10) and in series with a slave thermostat (30). This series thermostat connection causes control of the HVAC system (10) to be determined by the thermostat located in the room that receives the higher air flow.

Claims

1. A method for selectively controlling air flow from at least one efferent end of the ducts of an HVAC system, comprising the steps of:

selecting a desired air flow through the HVAC ducts in response to flow control signals using a flow control valve interfaced with at least one efferent end of the HVAC ducts;

generating flow control commands using a flow control command device;

converting the flow control commands to flow control signals using a command decoder; and

moving the flow control valve to a known reference position, and moving the flow control valve from the reference position to a position that produces the desired air flow using the flow control signals.

2. The method of claim 1 wherein the step of moving comprises moving the flow control valve for a specific period of time at a nonlinear displacement rate.

3. The method of claim 1 wherein the step of moving comprises moving the flow control valve for a specific period of time at a linear displacement rate.

4. The method of claim 1 wherein the step of converting comprises receiving a digital flow control command input comprised of a GO signal that initiates a timed flow control signal output that drives a motor to enable the flow control valve to move to a reference position, and a digital flow control command input further comprised of a digital position code that produces a timed flow control signal output that drives a motor to enable the flow control valve to move from it'"'"'s reference position to a position determined by the magnitude of the digital position code.

5. The method of claim 1 wherein the step of generating comprises using a flow control command device that is connected to the command decoder by wireless means.

6. The method of claim 1 wherein the step of generating comprises manually selecting an air flow.

7. The method of claim 1 wherein the step of generating comprises selecting air flows for specific periods of time on specific days of the week.

8. The method of claim 1 wherein the step of generating is controlled by temperature.

9. The method of claim 1 wherein the step of generating comprises selecting an air flow that is proportional to the magnitude of the difference between a desired temperature and the actual temperature.

10. The method of claim 1 wherein the step of generating comprises selecting an air flow requested by a home automation system.

11. A method for selectively controlling air flow from at least one primary flow control valve interfaced with at least one efferent end of the ducts of an HVAC system and at least one complementary flow control valve interfaced with at least one other efferent end of the ducts of an HVAC system with minimal change in the total air flow through the HVAC system, comprising the steps of:

selecting a desired air flow through the HVAC ducts in response to flow control signals using a primary flow control valve interfaced with at least one efferent end and at least one complementary flow control valve interfaced with at least another efferent end of the HVAC ducts;

generating flow control commands using a flow control command device;

converting the flow control commands to flow control signals using a command decoder;

moving at least one primary flow control valve to a known reference position, and moving at least one complementary flow control valve to a complementary reference position using flow control signals;

moving each flow control valve from it'"'"'s reference position to positions that produce complementary air flow using flow control signals;

locating at least one master thermostat proximate to at least one primary flow control valve;

locating at least one slave thermostat proximate to at least one complementary flow control valve; and

connecting the thermostats in a logical AND configuration that requires all connected thermostats to be calling in order to enable the HVAC system to be operated.

12. The method of claim 11 wherein the step of moving comprises moving the flow control valves for specific periods of time at nonlinear displacement rates.

13. The method of claim 11 wherein the step of moving comprises moving the flow control valves for specific periods of time at linear displacement rates.

14. The method of claim 11 wherein the step of converting comprises receiving a digital flow control command input comprised of a GO signal that initiates a timed flow control signal output that drive motors to enable the flow control valves to move to their reference positions, and a digital flow control command input further comprised of a digital position code that produces a timed flow control signal output that drives motors to enable the flow control valves to move from their reference positions to positions determined by the magnitude of the digital position code.

15. The method of claim 11 wherein the step of generating comprises using a flow control command device that is connected to the command decoder by wireless means.

16. The method of claim 11 wherein the step of generating comprises manually selecting an air flow.

17. The method of claim 11 wherein the step of generating comprises selecting air flows for specific periods of time on specific days of the week.

18. The method of claim 11 wherein the step of generating is controlled by temperature.

19. The method of claim 11 wherein the step of generating comprises selecting an air flow that is proportional to the magnitude of the difference between a desired temperature and the actual temperature.

20. The method of claim 11 wherein the step of generating comprises selecting an air flow requested by a home automation system.

21. The method of claim 11 wherein at least one complementary flow control valve is connected as a bypass between the air outlet and the air inlet of the HVAC system.

22. A flow control system for selectively controlling air flow from at least one efferent end of the ducts of an HVAC system, comprising:

a flow control valve interfaced with at least one efferent end of the HVAC ducts, said flow control valve operable to control the flow of air therethrough in response to flow control signals;

a flow control command device for generating flow control commands;

a command decoder for converting flow control commands to flow control signals;

a positioning system for moving said flow control valve to a known reference position; and

moving said flow control valve from said known reference position to a position that produces the desired air flow using said flow control signals.

23. The system of claim 22 wherein said positioning system is a motor connected to a mechanical assembly that moves the flow control valve at a nonlinear displacement rate.

24. The system of claim 22 wherein said positioning system is a linear actuator that moves the flow control valve at a linear displacement rate.

25. The system of claim 22 wherein the command decoder is a converter that accepts flow control commands composed of a digital position code and a digital GO signal and produces flow control signals composed of an output start signal, whose duration in time is sufficient to drive a motor to position the flow control valve at a known reference position and said converter produces flow control signals composed of an output restart signal, whose duration is proportional to the magnitude of said digital position code and sufficient to drive a motor to position the flow control valve from the reference position to a position that produces the desired air flow.

26. The system of claim 22 wherein said flow control command device is connected to the command decoder using wireless means.

27. The system of claim 22 wherein said flow control command device is a control that allows manual air flow selection.

28. The system of claim 22 wherein said flow control command device is an apparatus that selects air flows for specific periods of time on specific days of the week.

29. The system of claim 22 wherein said flow control command device is an apparatus the selects air flows by temperature.

30. The system of claim 22 wherein said flow control command device is an apparatus that selects an air flow that is proportional to the magnitude of the difference between a desired temperature and the actual temperature.

31. The system of claim 22 wherein said flow control command device is an apparatus that selects an air flow requested by a home automation system.

32. The system of claim 22 wherein said flow control valve is composed of a round, elliptical-shaped plunger and a compatible valve seat that exhibits aerodynamic compliance and thereby reduces air flow turbulence and noise.

33. The system of claim 22 wherein said flow control signals share a common bus with receive transducers.

34. A flow control system for selectively controlling air flow from at least one primary flow control valve interfaced with at least one efferent end of the ducts of an HVAC system and at least one complementary flow control valve interfaced with at least one other efferent end of the ducts of an HVAC system with minimal change in the total air flow through the HVAC system, comprising:

a primary flow control valve interfaced with at least one efferent end and at least one complementary flow control valve interfaced with at least one other efferent end of the HVAC ducts, said flow control valves operable to control the flow of air therethrough in response to flow control signals;

a flow control command device for generating flow control commands;

a command decoder for converting the flow control commands to flow control signals;

a positioning system for moving at least one primary flow control valve to a known reference position, and for moving at least one complementary flow control valve to a complementary reference position, and for moving each flow control valve from it'"'"'s reference position to positions that produce complementary air flow using flow control signals;

at least one master thermostat located proximate to at least one primary flow control valve;

at least one slave thermostat located proximate to at least one complementary flow control valve; and

a logical AND connection between the thermostats that requires all connected thermostats to be calling in order to enable the HVAC system to be operated.

35. The system of claim 34 wherein said positioning system is a motor connected to a mechanical assembly that moves the flow control valve at a nonlinear displacement rate.

36. The system of claim 34 wherein said positioning system is a linear actuator that moves the flow control valve at a linear displacement rate.

37. The system of claim 34 wherein the command decoder is a converter that accepts flow control commands composed of a digital position code and a digital GO signal and produces flow control signals composed of an output start signal, whose duration in time is sufficient to drive a motor to position the primary flow control valve at a known reference position and a motor to position the complementary flow control valve at a known complementary reference position and said converter produces flow control signals composed of an output restart signal, whose duration is proportional to the magnitude of said digital position code and sufficient to drive a motor to position the flow control valves from their reference positions to positions that produce the desired air flow.

38. The system of claim 34 wherein said flow control command device is connected to the command decoder using wireless means.

39. The system of claim 34 wherein said flow control command device is a control that allows manual air flow selection.

40. The system of claim 34 wherein said flow control command device is an apparatus that selects air flows for specific periods of time on specific days of the week.

41. The system of claim 34 wherein said flow control command device is controlled by temperature.

42. The system of claim 34 wherein said flow control command device is an apparatus that selects air flow that is proportional to the magnitude of the difference between a desired temperature and the actual temperature.

43. The system of claim 34 wherein said flow control command device is an apparatus that selects an air flow requested by a home automation system.

44. The system of claim 34 wherein said flow control valve is composed of a round, elliptical-shaped plunger and a compatible valve seat that exhibits aerodynamic compliance and thereby reduces air flow turbulence and noise.

45. The system of claim 34 wherein the flow control signals share a common bus with receive transducers.

46. The system of claim 34 wherein the complementary flow control valve is connected as a bypass between the plenum outlet and the air inlet of the HVAC system.