Patent ID: 11970049
Assignee: BREATHESAFE PTY LTD
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 0:
1. A system for controlling dust in a cabin, the cabin comprising a shell separating a cabin interior from an external environment containing dust, the system comprising:
a positive pressure unit comprising a channel extending from an air intake to a cabin inlet into the cabin interior and a positive pressure fan in communication with the channel, wherein the positive pressure fan can cause air from the external environment to pass from the air intake and through a first filter to the internal environment to pressurize the cabin;
an air circulation unit comprising a circulation fan in an air flow passageway, the air flow passageway receiving air from the positive pressure unit and from a return air intake in communication with the cabin interior and expelling air through one or more conduits in communication with the cabin interior, wherein the circulation fan can cause air from the cabin interior to pass through a second filter, be mixed with air from the positive pressure unit, and be redelivered to the cabin interior; and
a control system in communication with the positive pressure unit or the air circulation unit, the control system comprising a controller and one or more detectors, wherein at least one of the one or more detectors comprises a dust sensor and wherein the controller receives an input signal from the dust sensor related to the dust level in the cabin and wherein the controller generates an output signal in response to the input signal, the output signal being delivered to the positive pressure unit or the air circulation unit to control the operation thereof, and wherein when the dust level exceeds a predetermined value, the controller causes the positive pressure unit to increase the fan speed of the positive pressure fan.