Abstract:
An improved kinetic spray nozzle system design is disclosed. The nozzle includes an improved powder injector having an injector tube and a sleeve wherein the injector tube is received in the sleeve and secured to the sleeve. The powder injector further includes an air gap defined between an inner diameter of the sleeve and an outer diameter of the injector tube wherein the air gap is from 50 to 200 microns. The improved injector is capable of spraying a variety of powder materials including hard and "gummy" powders without clogging for extended periods of time. The improved injector design allows the use of higher main gas temperatures to achieve improved coating formation and deposition efficiencies. Most importantly, the improved design makes it possible to use the kinetic spray system with a wide range of powder materials in a manufacturing setting without interruptions caused by powder injector clogging.
Abstract:
A nozzle assembly (48) for a kinetic spray system includes a convergent portion (72) , a throat portion (82) , and a divergent portion (76) , each cooperating together to define a passage (66) therethrough for passing a mixture of powder particles (22) suspended in a flow of a high pressure heated gas. The nozzle assembly (48) further includes an extension portion (86) attached to the divergent portion (76) and extending to a distal end (88) a pre-determined length (L) from the divergent portion (76) of the nozzle assembly (48) . The extension portion (86) permits a dragging force exerted on the powder particles (22) by the flow of high pressure heated gas to act upon the powder particles (22) for a longer duration of time, thereby permitting the powder particles (22) to accelerate to a greater velocity than has been previously achievable.
Abstract:
An improved kinetic spray system (10) and a method for using the same in a high speed manufacturing environment are disclosed. The improved kinetic spray nozzle system (10) comprises: a gas/powder exchange chamber (49) connected to a first end of a powder/gas conditioning chamber (80) having a length (L) along a longitudinal axis of equal to or greater than 20 millimeters; a converging diverging supersonic nozzle (54), the supersonic nozzle (54) having a converging section (56) separated from a diverging section by a throat (58), the diverging section comprising a first portion (59A) and a second portion (59B), with the first portion (59A) having a cross-sectional area that increases along a length of the first portion (59A) and with the second portion (59B) having a substantially constant cross-sectional area along a length of the second portion (59B); and the converging section (56) connected to a second end of the powder/gas conditioning chamber (80) opposite the first end. The method includes: use of the disclosed nozzle system (10) with the addition of hard particles that permit maximum enhancement of particle temperature while not permitting clogging of the nozzle (54); use of controlled particle feed rates to match the desired very high traverse speeds; and use of pre-heating of the substrate to clean it an to enhance particle bonding. With the disclosed nozzle system (10) coupled with the disclosed methods one can apply kinetic spray coatings at traverse speeds of over 200 centimeters per second with a deposition efficiency of over 80 percent.
Abstract:
An oil change sensing system (10) for an internal combustion engine (30), having an oil pressure sensor (14) adapted to provide an oil pressure signal to an engine control module (12); an oil temperature sensor (16) adapted to provide an oil temperature signal to the engine control module; wherein the engine control module comprises an algorithm (70, 170) which determines the oil's viscosity by using the measured oil temperature and oil pressure and the determined oil viscosity and a fresh oil viscosity are used to determine whether the oil is in a preferred operating range.
Abstract:
A magnetorheological (MR) piston assembly (110) includes an MR piston (112), a rod (114), and a guide member (116). The guide member includes an MR fluid passageway (124) and is attached to at least one of the piston and rod. A perimeter of a projection of the guide member onto a plane perpendicular to the longitudinal axis surrounds and is spaced apart from a perimeter of a projection of the MR piston onto the plane A damper 138 includes an MR piston assembly (110) and a tube (140). The piston assembly includes a piston (112), a rod (114), and a guide member (116). The guide member includes an MR fluid passageway (124) and is attached to at least one of the piston and rod. The guide member diameter is greater than the piston diameter. The tube surrounds and is radially spaced apart from the piston and surrounds the guide member, wherein the guide member makes sliding contact with the tube.
Abstract:
A gas collimator (40') for use in a kinetic powder spray system is disclosed. The collimator (40') reduces turbulence of the main gas and results in significant increases in the amount of particles deposited on a substrate using the system. The collimator (40') enables the main gas temperature to be reduced. Also disclosed is a low pressure injection method for a kinetic spray system. The coaxial, low pressure injection method enables the use of low pressure powder feeders, which are low cost, technologically mature, and widely available commercially.
Abstract:
An oil change sensing system (10) for an internal combustion engine (30), having an oil pressure sensor (14) adapted to provide an oil pressure signal to an engine control module (12); an oil temperature sensor (16) adapted to provide an oil temperature signal to the engine control module; wherein the engine control module comprises an algorithm (70, 170) which determines the oil's viscosity by using the measured oil temperature and oil pressure and the determined oil viscosity and a fresh oil viscosity are used to determine whether the oil is in a preferred operating range.
Abstract:
A nozzle assembly (48) for a kinetic spray system includes a convergent portion (72) , a throat portion (82) , and a divergent portion (76) , each cooperating together to define a passage (66) therethrough for passing a mixture of powder particles (22) suspended in a flow of a high pressure heated gas. The nozzle assembly (48) further includes an extension portion (86) attached to the divergent portion (76) and extending to a distal end (88) a pre-determined length (L) from the divergent portion (76) of the nozzle assembly (48) . The extension portion (86) permits a dragging force exerted on the powder particles (22) by the flow of high pressure heated gas to act upon the powder particles (22) for a longer duration of time, thereby permitting the powder particles (22) to accelerate to a greater velocity than has been previously achievable.