Northrop Grumman Systems Corporation

David Bohman Tracy

Robert Michael Garcia

Brent R Meredith

James J Allard

David J Hancock

Gregory N Stein

Raymond E Miller

A high-velocity, accurately responsive impingement heater provides heated air at a substantially constant temperature to a process location to effect control of a process. The heater includes an air line for conducting air from an inlet thereof to the process location. A heat exchanger, including a plurality of electrical heating elements, heats air conducted through the air line. A power driver is connected to the heat exchanger and applies current to the heat exchanger. A controller is connected to the driver and receives a predetermined process temperature input from the user, as required for effecting control of the process. A process temperature sensor is positioned at the process location and measures the temperature of the air provided to the process location. The process temperature sensor provides a process temperature signal to the controller which is indicative of the air temperature at the process location. An internal temperature sensor is positioned immediately downstream from the heat exchanger and measures the temperature of the air at that location in the air line. The internal temperature sensor provides an internal temperature signal to the controller which is indicative of the air temperature downstream from the heat exchanger. Based upon the temperature signals from the temperature sensors, the controller provides a control signal to the driver for specifying the amount of heat required at the process location in order for the heated air to substantially equal the predetermined process temperature. The driver then applies a corresponding current to the heat exchanger in response to the control signal.

High-velocity electrically heated air impingement apparatus with heater control responsive to two temperature sensors

A blast head for abrasive blasting has a nozzle for directing a blast media at a surface being treated and a housing for containing the blast media after it passes through the nozzle and for facilitating recirculation of the blast media. An adjustment mechanism facilitates varying of the orientation of the nozzle with respect to the surface being treated, so as to facilitate enhanced blasting thereof.

Closed circuit media capture and recovery head for the portable wheat

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Lake Charles, LA, United States of America

David Bohman Tracy