Venturi valve and control system

摘要

Embodiments of the invention provide a venturi valve and control system for use in an indoor environment to regulate air flow. The venturi valve includes a substantially cylindrical pipe, a high pressure sensing assembly, a low pressure sensing assembly, a differential pressure transducer, and a damper assembly. The high pressure sensing assembly and the low pressure sensing assembly do not substantially impede air flow through the valve. A controller is connected to the differential pressure transducer and a damper actuator. The controller determines a current flow rate of air into the indoor environment and operates the damper actuator in order to provide a desired flow rate of air into the indoor environment.

主权项

1. A venturi valve for use in an indoor critical environment to regulate air flow, the venturi valve positioned in an exhaust duct, the venturi valve comprising:
a substantially cylindrical pipe including at least a first section having a first diameter and a second section having a second diameter, the first diameter being larger than the second diameter, wherein the first section is coupled to the second section by a third section that is defined by a reducing diameter; a high pressure sensing assembly including a first pneumatic tube positioned around the first diameter, the first pneumatic tube coupled to a first plurality of air inlet ports, the first plurality of air inlet ports spaced around the first diameter to sense a first average static pressure at the first diameter; a low pressure sensing assembly including a second pneumatic tube positioned around the second diameter, the second pneumatic tube coupled to a second plurality of air inlet ports, the second plurality of air inlet ports spaced around the second diameter to sense a second average static pressure at the second diameter; a differential pressure transducer coupled to the high pressure sensing assembly and the low pressure sensing assembly, the differential pressure transducer generating a differential pressure signal based on the first average static pressure and the second average static pressure; a damper assembly coupled to the substantially cylindrical pipe, the damper assembly including a damper and a damper actuator; and a controller connected to the differential pressure transducer and the damper actuator, the controller determining a current flow rate of air into the indoor critical environment based on the differential pressure signal, the controller operating the damper actuator based on the current flow rate in order to provide a desired flow rate of air out of the indoor critical environment until the indoor critical environment is cleared through the exhaust duct and a pressure of the indoor critical environment is neutral relative to adjacent spaces.