Showing papers on "Nozzle published in 1992"

Ink jet recording head

Abstract: PURPOSE:To resolve problems of a deflection in flying ink and a failure to deliver ink by a method wherein ink liquid contact surfaces of an ink storage part and a nozzle opening part are surface treated to be provided with a member of a high affinity for ink for eliminating bubbles existing in the ink storage part and the nozzle opening part. CONSTITUTION:In a surface treatment to ink liquid contact surfaces of an ink storage part 1 and a nozzle opening part 3 in this invention, an Au film 10 is formed on the ink liquid contact surfaces to improve an affinity for ink with respect to a member having a poor wettability by hot melt ink 5.

Amplitude conversion actuator for ink jet printer head

Abstract: PURPOSE:To make it possible to discharge ink at a low drive voltage by forming a weight part which comes in contact with an oscillation element at the tip of a leaf spring formed in one piece with a base between the oscillation element and a nozzle orifice. CONSTITUTION:If a starting pulse is applied to a piezoelectric amplitude 2, a piezoelectric element 2 becomes stretched sharply and the weight part 1b of an amplitude conversion actuator is pressed by the end surface 2a of the piezoelectric element 2 to come close to a nozzle orifice 3a. If an ending pulse is applied, the piezoelectric element 2 becomes contracted instead of stretched. However, the weight part 1b further approaches the nozzle orifice 3a due to a cycle comprising the relationship between the spring properties of a leaf spring part 1a and the weight of the weight part 1b, as the movement of the weight part 1b in a nozzle orifice direction is not restricted by the piezoelectric element 2. Then the speed is reduced to 0 when the weight part 1b comes in contact with a nozzle plate 3. Next, the weight part 1b shifts to a restoration process due to the spring properties of the leaf spring part 1a and comes in contact with the end surface 2a of the piezoelectric element 2. Thus the device is initialized. A pressure generates due to the oscillation of this movement and ink 4 is discharged from the nozzle orifice 3a in the form of ink droplets.

Self-accommodating brush seal for gas turbine combustor

Abstract: The gas turbine includes a combustor 10 having a transition piece 18 with its exit end spaced from a first-stage nozzle 22. A brush seal 26 seals about the space between the transition piece and first-stage nozzle. The brush seal includes a sealing cap 28 supported by one of the transition piece and the first-stage nozzle and having a portion 38 overlying the other of the transition piece and first-stage nozzle. A seal ring 30 is secured to the other of the transition piece and the first-stage nozzle and carries bristles 32 projecting therefrom for engagement with the overlying portion 38 of the sealing cap 28 to seal the gap between the transition piece and the first-stage nozzle. In one form, the side face portions of the bristles of the bristle pack form the seal by engaging against a planar sealing surface.

Ink-jet recording method

Abstract: PURPOSE:To equalize the size of droplets and the speed of flying when the same heat energy is applied at all times on continuous recording by thermally expanding air in a pressure chamber, parting ink in an ink nozzle by the air, flying the ink parted as ink droplets form the nose of the nozzle by utilizing working force generated at the time. CONSTITUTION:Ink (i) is arranged into a nozzle, air (d) is sealed into a pressure chamber 5 communicated with the nozzle near a nozzle orifice (b), and heat energy is applied to the sealed air (d). Air (d) in the pressure chamber 5 is heated suddenly, and ink (i) is discharged. The area of a heating resistor is spread, the width of applied pulses is broadened and the application of heat energy is increased, and a distance between a pressure propagation path as the outlet of the pressure chamber and a nozzle nose is reduced at that time, thus parting ink (i) in the nozzle while using the connecting section of the pressure propagation path 10 and the nozzle as a boundary. One part is flown as ink droplets immediately after the parting.

The effects of temperature on supersonic jet noise emission

Abstract: This paper examines the generation of sound produced by high temperature supersonic jets. In particular, the question of the importance of supersonic instability waves to noise emission is considered relative to the role of Kelvin-Helmholtz (K-H) instability waves. Here, these waves are taken to be synonymous with the Mach emission process. Jet total temperatures from 313 to 1534 K are investigated using an axisymmetric water cooled supersonic nozzle designed for Mach 2. The aerodynamic and acoustic results of this study indicate that the dominant noise contributors are the K-H waves over the entire temperature range. Good agreement between measured and numerically predicted plume properties are obtained and an elliptic nozzle is used to demonstrate reduction of the K-H waves.

Experimental and numerical investigations of low-density nozzle and plume flows of nitrogen

Abstract: New experimental data are used to show that the direct simulation Monte Carlo (DSMC) method provides an accurate description of a low-density flow in the nozzle and the near-field expansion of a small rocket for two slightly different experimental configurations. These results verify the DSMC method in an expansion flow for the first time. From a number of different gas/surface interaction models, it is found that fully diffuse reflection gives the best agreement with experiment.

Plasma arc cutting process and apparatus using an oxygen-rich gas shield

Abstract: A plasma arc torch has a secondary gas flow that is extremely large during piercing of a workpiece to keep splattered molten metal away from the torch and thereby prevent "double arcing". The secondary flow exits the torch immediately adjacent the transferred plasma arc and is an extremely uniform, swirling flow. A swirl ring is located in the secondary gas flow path at the exit point. A prechamber feeds gas to the swirl ring, which is in turn fed through a flow restricting orifice. For certain applications the secondary gas is a mixture of an oxidizing gas, preferably oxygen, and a non-oxidizing gas, preferably nitrogen, in a flow ratio of oxygen to nitrogen in the range of 2:3 to 9:1. Preferably the flow ratio is about 2:1. A network of conduits and solenoid valves operated under the control of a central microprocessor regulates the flows of plasma gas and secondary gas and mixes the secondary gas. The network includes valved parallel branches that provide a quick charge capability and a set of venting valves, also electrically actuated by the microprocessor, to provide a quick discharge. In a preferred high-definition embodiment, a nozzle with a cut back outer surface and a large, conical head allows a metal seal and enhanced cooling. A two-piece cap protects the nozzle during cutting.

Multiple passage cooling circuit method and device for gas turbine engine fuel nozzle

Abstract: A gas turbine fuel nozzle and method of fuel flow provide resistance to coking of the fuel by means of a multiple passage heat transfer cooling circuit. Fuel streams to primary and secondary sprays of pilot and main nozzle tips are arranged to transfer heat between the pilot primary fuel stream and each of the main secondary fuel stream and the pilot secondary fuel stream. This protects the fuel in the streams from coking during both low flow, lower engine heat conditions and high flow, high engine heat conditions. This nozzle and flow can protect engines with both single tip and dual tip nozzles.

Laser ablated nozzle member for inkjet printhead

Abstract: In one of the preferred embodiments, an inkjet printhead includes a nozzle member formed of a polymer material that has been laser-ablated to form tapered inkjet orifices. The nozzle member is then mounted to a substrate containing heating elements, each heating element being associated with a single orifice. In a preferred method, the orifices are formed by Excimer laser ablation. In other aspects of the invention, vaporization chambers as well as ink channels, providing fluid communication between an ink reservoir and the orifices, are also formed by Excimer laser ablation.

Electric vacuum cleaner

Abstract: PURPOSE:To handle different types of refuses such as dry dust, wet dirt, and muddy water simply and cleanlily by installing a centrifugal dust collecting device on a floor nozzle, and furnishing a filter type dust collecting device at the body. CONSTITUTION:A centrifugal dust collecting device 5 is removably installed to a floor nozzle 4, which leads to the body 6 via a pipe 11. A filter type dust collecting device consisting of a filter 7 and a motor-driven blower 12 is installed in the body 6. Dirt and/or muddy water collected by sucking action of the blower 12 and scratching-up of a rotary brush 8 are sent through a suction pipe 9 to the centrifugal dust collecting device 5, rotated in a cylindrical case by the centrifugal force while situated alongside the wall, and accumulated at the bottom of a cylindrical vessel. Lightweight dust which is out of affection of the centrifugal force but is sucked by the suction force of the blower 12 built in the body 6, is sucked into a suction pipe 10 and seized by the filter 7 of the body 6. Thereby all types of refuses can be handled cleanlily.

System for automatic control of public washroom fixtures

Abstract: A washroom control system automatically controls water valves and soap valves by infrared sensing of a user's hands, testing a battery to determine whether enough energy is stored to reliably close a valve, and generating an alarm if the battery needs replacing. Initial sensing of a user's hands requires rapid nearby hand motion to avoid spurious detection, while continued user presence requires lower infrared sensor output signals. The system includes DIP switches set to control various delay times, whether valve open cycles are fixed or variable in accordance with continued user presence, whether a water valve is controlled in response to one or several infrared sensors, whether water valve operation is independent of or responsive to prior soap valve operation, and whether the water valves are for wash fountains or urinals. If a single water valve controls flow through plural wash fountain nozzles, a fixed length water flow cycle is retriggerable in response to any of a plurality of infrared sensors associated with the various nozzles or associated soap dispensers. If water valves are for urinals, valve opening is delayed by a preselected time after a user's presence is detected.

Device for ablation of material, particularly used in dentistry

Abstract: Device for ablation of material, particularly a handpiece (1) used in dentistry, comprising optical means (6, 16, 22, 32) for the propagation and guiding upto a working surface of a coherent light beam (10), as well as channelling means (24, 30) for conveying a pressurised fluid to the working head (5) of the device and a nozzle (20) situated in the said working head downstream of the said channelling means and connected to the latter in order to form a jet (32) of liquid fluid. The device is characterised in that it comprises a pressure-reduction chamber (30) upstream of the said nozzle (20) and in that the optical axis (18) of the coherent light beam (10) is aligned on the central axis of the channel of the nozzle (20), the said jet (32) of liquid fluid being used as a waveguide between the said working head (5) and the working surface.

Common rail fuel injection system

Abstract: A common rail fuel system, primarily including a high-pressure fuel pump, a rail, fuel injection nozzles, and an electronic control system, is disclosed. A substantially constant fuel pressure is maintained within the rail by the fuel pump under the direction of the electronic control system. The pressurized fuel is communicated to the fuel injection nozzles, which are also under the direction of the electronic control system, thereby providing fuel at injection pressure immediately upon the actuation of the fuel injection nozzles by the electronic control system. The pump incorporates leakage fuel during each stroke without the necessity of rerouting the leakage fuel through a primary supply. This reduces the total amount of fuel pumped and improves metering accuracy.

Apparatus for droplet stream manufacturing

Abstract: A method of manufacture of a net form product, including directing a stream of liquid from a nozzle onto a collector of the shape of the desired product, applying a disturbance to the stream, preferably an amplitude modulated disturbance, to produce a droplet stream, and with the nozzle and collector in a chamber, controlling the chamber environment. An apparatus for manufacturing a net form product having a source of molten material under pressure, a support for positioning a product collector in a chamber with the collector defining a desired product, a droplet stream generator positioned within the chamber and including a nozzle, a conduit for conducting molten material from the material source to the generator nozzle, a mechanism, typically a modulator, for disturbing the droplet stream, and a drive mechanism for relative movement of the nozzle and support.

Apparatus for taking liquid content for use in analysis out of container

Abstract: A device for delivering a serum sample from a blood collection tube into one or more sample vessels or reaction vessels, including a pair of arms which are arranged movably in opposite directions, a motor for driving the arms to selectively grasp the blood collection tube, a block to which the arms are provided, a motor for rotating the block over 135 degrees, a needle-like suction nozzle secured to the block, a syringe having a main body coupled with the suction nozzle and a piston arranged movably within the main body, a motor for driving a piston of the syringe, a slide block on which the block is arranged rotatably, a motor for moving the slide block in right and left directions, a base member arranged movably up and down, and a motor for driving the base member up and down. After the blood collection tube is picked out of a rack by the arms, the base member is moved downward to insert the suction nozzle into the container through the cap, and then the block is rotated to turn over the blood collection tube. Then, the serum sample is sucked by operating the syringe, and then the block is rotated into an initial position. After the suction nozzle is pulled out of the cap, a given amount of the sucked serum sample is discharged into one or more sample vessels or reaction vessels.

Blast cleaning system

Abstract: This invention relates to a carbon dioxide blast cleaning system for propelling dry-ice pellets by cryogens, namely high pressure nitrogen, helium and/or oxygen, against a surface being cleaned. Carbon dioxide pellets, in a pellet hopper, a blast unit and a blast gun are located at a blast site near the surface being cleaned. A portable cryogenic liquid nitrogen, liquid helium and/or liquid air tank with an ambient air vaporizer is also located at or near the blast site. Cryogenic liquid nitrogen, liquid helium and/or oxygen flow through the ambient air vaporizer to the liquid and is vaporized to form a high pressure gas. The high pressure, cryogenic gas is then brought into the blast unit and mixed with the pellets. The mixture of the high pressure gas and the pellets exit the gun nozzle at high velocities to blast the surface being cleaned.

Ink-jet print head and ink-jet printer

Abstract: The present invention is to provide an on-demand type ink-jet printer which is free from the risk such that the nozzle is stopped and which is also free from the maintenance. An ink-jet print head comprises a liquid chamber (2) into which a carrier liquid (7) is filled, ink-jet driving means (3), (4) disposed within the liquid chamber (2), a nozzle (14) communicated with the liquid chamber (2) and a mixing unit (14a) disposed in the vicinity of the nozzle (14) for mixing an ink (9) into the carrier liquid (7). The ink (9) is mixed into the carrier liquid (7) in the liquid chamber (2) by the mixing unit (14a), pressed by the ink-jet driving means (3), (4) and then ink-jetted from the nozzle (14). Since the carrier liquid (7) is constantly filled into the nozzle (14), the nozzle (14) can be prevented from being choked up.

Diamond growth by microwave generated plasma flame

Abstract: A swirl flow microwave plasma torch is provided for the growth of diamond films. The swirl flow torch incorporates an injection nozzle that directs reactant gases into a cylindrical flow tube extending through the center of a tuned microwave cavity. The outer surface of the nozzle comprises a contoured, conical shape that causes inert gas, directed tangentially against the outer surface of the nozzle, to swift in a helical path that surrounds and confines the reactant gas emerging from the nozzle. The tuned cavity is coupled to a microwave energy source to generate a highly localized plasma in the reactant gas in the center of the sheathing swirl of inert gas. The swirl of inert gas contains the plasma in a well-defined shape, prevents in-diffusion of undesirable gases, forms a boundary layer to prevent plasma migration, and provides flow tube cooling. The reactant gas flow forces the plasma out of the flow tube to form a plasma flame that can be impinged on a substrate to induce diamond growth.

Premix gas nozzle

Abstract: A premix gas nozzle has longitudinal tangential entrance slots to a cylindrical chamber There is an axially increasing flow area toward the chamber outlet, with pilot fuel centrally introduced near the outlet A lean mix low NOx fuel nozzle is thereby stabilized

Ink jet recorder

Abstract: PURPOSE:To diminish scatters in ink spouting speed for stabilizing and improving the quality of printing by a method wherein a nozzle head consists of a base plate in which ink flow paths and pressure chambers are formed and a nozzle plate which is attached on the front face of the base plate and provided with nozzle holes through which ink is spouted, and the nozzle hole has a wave- shaped outline on the flow path side of the base plate. CONSTITUTION:Ink flow paths 20 and 23 and a pressure chamber 21 are formed in a base plate 33. Nozzles 10 are located on the front face of the base plate 33. The outline of a paper-side hole 10b of the nozzle 10 is circular, and a flow path-side hole 10a has a closed wavy outline which is symmetric about the center point of the paper side hole 10a. Thereby, the flow path resistance is also symmetric about the center point, and an uneven flow path resistance just before ink is spouted is diminished, causing the ink jet stream from curving. Simultaneously, the surface tension is uniform while printing is not performed, so that a stable meniscus of ink is developed and maintained in the nozzles 10. the nozzles 10 can be formed with less amount of material to be removed, and less thermal deterioration layer is generated, so that the nozzles 10 can be easily processed by laser boring process.

Method and apparatus for improved water rides by water injection and flume design

Abstract: A method and apparatus for controllably injecting, subsequent to the start of a water ride, a high velocity water flow over the water ride surface. A rider (or vehicle) that rides into such injected flow can, as the result of water-to-rider momentum transfer, either be accelerated, matched, or de-accelerated in a downhill, horizontal or uphill straight or curvilinear direction by such injected flow. Flow emitting nozzles can either be positioned above, along side or from any position along the length of the water ride surface. When a horizontal or upwardly inclined ride surface has flumed channel walls, either a special "flume within a flume" design is incorporated, or vents are positioned along the sides or bottom of the riding surface to minimize any transient surge/hydraulic jump that occurs during start-up or when a lower speed rider encounters a higher speed water flow. When the water ride surface has a downchute portion immediately followed by a rising portion, properly injected water flows can either enhance the recovery elevation of the rider in excess of that available under conventional gravity only water ride systems, or stabilize and equalize the coefficients of friction and trajectory of differently sized and weighted participants to insure ride safety, consistency and capacity.

Portable steam vacuum cleaner

Abstract: A vacuum cleaning apparatus is provided which includes a housing having a handle portion and a nozzle portion. A reservoir is defined in the housing for retaining cleaning solution or water, and a heating unit is associated with the reservoir for heating the liquid so as to generate steam for delivery to a flat surface such as a window to be cleaned. A squeegee assembly is mounted to the housing adjacent the nozzle portion for wiping the window after liquid has been deposited thereon. A motor driven fan assembly is disposed within the housing in communication with the nozzle portion for drawing excess liquid and debris into the nozzle portion. The nozzle portion defines structure for separating and containing the liquid which is drawn into the apparatus.

Supersonic nozzle mixer ejector

Abstract: The intent of this article is to describe recent experimental findings relative to supersonic nozzle mixer ejector performance. Such ejectors are a candidate means to reduce jet noise of commercial supersonic aircraft during takeoff and landing. The mixer ejector concept involves the introduction of an array of large-scale, low-intensity streamwise vortices into the downstream mixing duct, which enhances mixing through an inviscid stirring process. This results in increased ejector pumping performance and more completely mixed flows exiting the ejector shroud. Past experimental and analytical investigations of mixer ejectors have been confined to low-speed subsonic flows, and low primary temperatures (less than 2000°F). In this flow regime, ejector static pumping benefits of over 100% were achieved relative to conventional ejector designs. The goal of the present study was to evaluate mixer ejector performance in the high-temperature, supersonic primary flow regime. A convergentdivergent primary lobed nozzle (i.e., mixer nozzle) was designed and tested at choked pressure ratios in an ejector. Ejector pumping and exit plane mixing were measured for the mixer ejector and a conventional slot nozzle ejector. The two configurations were operated at a nozzle exit Mach number of 1.5 (nozzle pressure ratio = 3.4), a primary fluid total temperature of 1000°F, and a simulated forward flight Mach number of 0.1. Results indicate that properly designed lobed nozzles can increase supersonic ejector pumping by over 15%, relative to conventional slot primary nozzles.

High velocity thermal spray gun for spraying plastic coatings

Abstract: A high velocity, oxygen fuel ("HVOF") thermal spray gun for spraying a melted powder composition of, for example, thermoplastic componds, thermoplastic/metallic composites, or thermoplastic/ceramic composites onto a substrate to form a coating thereon. The gun includes an HVOF flame generator for providing an HVOF gas stream to a fluid cooled nozzle. A portion of the gas stream is diverted for preheating the powder, with the preheated powder being injected into the main gas stream at a downstream location within the nozzle. Forced air and vacuum sources are provided in a shroud circumscribing the nozzle for cooling the melted powder in flight before deposition onto the substrate.

Apparatus for applying medicament to an eye

Abstract: An apparatus (10) is used to apply medicament to an eye and stores the medicament in a medicament chamber (38). A nozzle (20) is coupled in fluid communication with the medicament chamber and is formed by an outer nozzle portion (22) and an inner nozzle portion (24) received within the outer nozzle portion. A seam (25) is formed by the interface of the inner nozzle portion and the outer nozzle portion and is normally in a closed position to prevent the passage of medicament through the nozzle. The seam opens in response to the flow of medicament of sufficient pressure into the seam to permit the passage of medicament through the nozzle for release into the eye.

Apparatus for injecting a fluid into filter tow

Abstract: A fluid injection device and method of injecting and distributing a fluid, such as a gas, liquid or combination thereof, to a continuous, multifilament filter tow used in the manufacture of filters for smokable tobacco products. The injection device includes a converging tongue portion from which a nozzle block is suspended and rigidly supported. A nozzle conduit with a plurality of feed holes is formed in the nozzle block for delivering the fluid to a precise location in the advancing filter tow during its formation and consolidation into a filter rod. Additives, such as flavorants, may be injected into the tow or the tow may be further bloomed by a gas, such as air, to decrease tow usage.

Behaviour of Bubbles at Gas Blowing into Liquid Wood's Metal.

Abstract: Experimental studies on the bubble behaviour in submerged gas blowing were carried out with liquid Wood's metal. About 440 kg of Wood's metal at 100°C was contained in a ladle-shaped glass vessel with an inner diameter of 40 cm. The liquid metal was stirred by nitrogen, argon or helium respectively through a nozzle positioned centrically or eccentrically at the bottom. The bubble plumes were investigated under different gas flow rates and nozzle diameters by determination of local gas fraction, bubble frequency, size distribution and rising velocity of bubbles.The measurements show that the radial distribution of gas fraction and bubble frequency can be described by a Gaussian function and the bubble size distribution obeys a log-normal function. Except for the region near the nozzle the mean rising velocity of bubbles is nearly constant over the radius. The influence of blowing conditions on these variables was estimated.

Specimen processing and analyzing systems with associated fluid dispensing apparatus

Abstract: A system for processing a specimen to which fluid must be added includes a fluid dispensing work station within a housing. The work station holds the fluids that are to be added to the specimen. A nozzle dispenses fluid at the work station. The system also includes a carrier that moves within the housing. The carrier operates in a first mode at the fluid dispensing work station. The carrier also operates in a second mode outside the work station to perform a different processing function. A coupling mechanism attaches the nozzle to the carrier when the carrier enters its first operational mode to transport the nozzle around the fluid dispensing station. The coupling mechanism releases the nozzle from the carrier when the carrier enters its second operational mode, thereby freeing the carrier for movement outside the work station out of association with the nozzle.