Positive air pressure isolation system
First Claim
1. An air-pressure control system, the system comprising:
- a self-contained unit housing extending through a structural opening in a wall of a building;
a system inlet in a first sidewall of the housing;
a system outlet in a second sidewall of the housing, which is opposite to the first sidewall;
a first filter located within an airflow path between the system inlet and system outlet;
a variable-speed fan configured to operate at a speed, the variable-speed fan being reversible;
a motor controller in communication with the fan and configured to control the speed of the fan;
a differential-air-pressure transducer configured to monitor an air pressure differential between the system inlet and the system outlet;
a closed-loop controller in communication with the motor controller and the differential-pressure transducer, wherein the closed-loop controller is configured to vary the speed of the fan based on the pressure differential between the inlet and outlet of the system, thereby controlling a pressure within a space; and
a control panel provided on the housing in communication with the closed-loop controller and configured to receive setpoint values and to change the speed or a direction of the fan based on the setpoint value;
wherein the control panel includes a switch having a positive pressure position and a negative pressure position, the fan operating in a first direction to create a controlled substantially constant positive pressure within the space when the switch is in the positive pressure position, the fan operating in a second direction to create a controlled substantially constant negative pressure within the space when the switch is in the negative pressure position.
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Accused Products
Abstract
An air-pressure-control system, the system comprising a system inlet, a system outlet, and a variable-speed fan configured to operate at a speed. A motor controller in communication with the fan is configured to control the speed of the fan. A differential-pressure transducer configured to monitor an air pressure at the system inlet and an air pressure at the system outlet. A closed-loop pressure controller in communication with the motor controller and differential-pressure transducer, wherein the pressure controller is configured to vary the speed of the fan based on the pressure differential between the inlet and outlet of the system, thereby controlling a pressure within a space. An ultraviolet kill chamber may be disposed between the inlet and outlet to expose airborne particulate to UV radiation. The system may also have a filter located within an air-flow path between the system inlet and system outlet.
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Citations
29 Claims
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1. An air-pressure control system, the system comprising:
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a self-contained unit housing extending through a structural opening in a wall of a building; a system inlet in a first sidewall of the housing; a system outlet in a second sidewall of the housing, which is opposite to the first sidewall; a first filter located within an airflow path between the system inlet and system outlet; a variable-speed fan configured to operate at a speed, the variable-speed fan being reversible; a motor controller in communication with the fan and configured to control the speed of the fan; a differential-air-pressure transducer configured to monitor an air pressure differential between the system inlet and the system outlet; a closed-loop controller in communication with the motor controller and the differential-pressure transducer, wherein the closed-loop controller is configured to vary the speed of the fan based on the pressure differential between the inlet and outlet of the system, thereby controlling a pressure within a space; and a control panel provided on the housing in communication with the closed-loop controller and configured to receive setpoint values and to change the speed or a direction of the fan based on the setpoint value; wherein the control panel includes a switch having a positive pressure position and a negative pressure position, the fan operating in a first direction to create a controlled substantially constant positive pressure within the space when the switch is in the positive pressure position, the fan operating in a second direction to create a controlled substantially constant negative pressure within the space when the switch is in the negative pressure position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An air-pressure-control system, the system comprising:
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a self-contained unit housing extending through a structural opening in a wall of a building; a system inlet in a first sidewall of the housing; a system outlet in a second sidewall of the housing, which is opposite to the first sidewall; a variable-speed fan configured to operate at a speed, the variable-speed fan being reversible; a motor controller in communication with the fan and configured to control the speed of the fan; a differential-air-pressure transducer configured to monitor an air pressure differential between the system inlet and the system outlet; a closed-loop controller in communication with the motor controller and the differential-pressure transducer, wherein the closed-loop controller is configured to vary the speed of the fan based on the pressure differential between the inlet and outlet of the system, thereby controlling a pressure within a space; and a control panel provided on the housing in communication with the closed-loop controller and configured to receive setpoint values and to change the speed or a direction of the fan based on the setpoint value; wherein the control panel includes a switch having a positive pressure position and a negative pressure position, the fan operating in a first direction to create a controlled substantially constant positive pressure within the space when the switch is in the positive pressure position, the fan operating in a second direction to create a controlled substantially constant negative pressure within the space when the switch is in the negative pressure position. - View Dependent Claims (19, 20, 21, 22)
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23. An air-pressure-control system, the system comprising:
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a self-contained unit housing extending through a structural opening in a wall of a building; a system inlet in a first sidewall of the housing; a system outlet in a second sidewall of the housing, which is opposite to the first sidewall; a means for moving air between an exterior and a closed space, the means for moving air being reversible in direction; a differential-air-pressure transducer configured to monitor an air pressure differential between the system inlet and the system outlet; a closed-loop controller in communication with the means for moving air and differential-air-pressure transducer, wherein the closed-loop controller is configured to vary a rate at which the air is moved based on the pressure differential between the inlet and outlet of the system, thereby controlling a pressure within the closed space; and a control panel provided on the housing in communication with the closed-loop controller and configured to receive setpoint values and to change the speed or a direction of the means for moving air based on the setpoint value; wherein the control panel includes a switch having a positive pressure position and a negative pressure position, the means for moving air operating in a first direction to create a controlled substantially constant positive pressure within the space when the switch is in the positive pressure position, the means for moving air operating in a second direction to create a controlled substantially constant negative pressure within the space when the switch is in the negative pressure position. - View Dependent Claims (24, 25)
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26. An air pressure control system, the system comprising:
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a self-contained unit housing extending through a structural opening in a wall of a building; a first unidirectional air path including a first air path inlet in a first sidewall of the housing and a first air path outlet in a second sidewall of the housing, which is opposite to the first sidewall; a second unidirectional air path including a second air path inlet and second air path outlet; a variable-speed fan located within the first unidirectional air path and configured to operate at a speed, the variable-speed fan being reversible; a motor controller in communication with the variable-speed fan and configured to control the speed of the variable-speed fan; a differential-air-pressure transducer located within the second unidirectional air path and configured to monitor an air pressure differential between the second air path inlet and the second air path outlet; a closed-loop controller in communication with the motor controller and differential-air-pressure transducer, wherein the closed-loop controller is configured to maintain a pressure in a space by varying the speed of the fan based on the pressure differential between the air pressure at the second air path inlet and the air pressure at the second air path outlet; and a control panel provided on the housing in communication with the closed-loop controller and configured to receive setpoint values and to change the speed or a direction of the fan based on the setpoint value; wherein the control panel includes a switch having a positive pressure position and a negative pressure position, the fan operating in a first direction to create a controlled substantially constant positive pressure within the space when the switch is in the positive pressure position, the fan operating in a second direction to create a controlled substantially constant negative pressure within the space when the switch is in the negative pressure position. - View Dependent Claims (27, 28, 29)
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Specification