Showing papers on "Nozzle published in 1990"

The Use of an Ejector as a Refrigerant Expander

Abstract: One of the thermodynamic losses in the vapor-compression retr1geration cycle is the throttllng process in the expansion valve. It work is extracted from the refr1gerant during the expansion process, the efficiency of the cycle is swnificantly 1mproved. It 1s proposed that the high-pressure retngerant be used as the motive fluid of a Jet ejector. Instead of extract1ng mechanical work from the expanding refrigerant, 1ts kinetic energy is used to partially compress the saturated vapor leaving the evaporator, increas1ng the enthalpy change in the evaporator and reduc1ng the load on the compressor. A first-order analysis of the cycle performance shows sign1ficant 1ncrease in coeffic1ent of performance and decrease 1n compressor displacement relative to a standard vapor-compresslon cycle. The analysis shows much greater performance changes tor some refrigerants than for others, 1ndicating a potential impact on the selection of new, non-CFC refrigerants. COP h p r s u X q Coetficlent of Performance specific enthalpy pressure motive flow/total flow specific entropy veloc1ty qua.l1ty efficiency IIOIIENCLATURE d tc ge m n s Subscripts: diffuser outlet condenser saturated l1quid evaporator saturated vapor mixing section outlet motive nozzle outlet suction nozzle outlet

Method for microwave plasma assisted supersonic gas jet deposition of thin films

Abstract: A thin film is formed on a substrate positioned in a vacuum chamber by use of a gas jet apparatus affixed to a vacuum chamber port and having an outer nozzle with an interior cavity into which carrier gas is fed, an inner nozzle located within the outer nozzle interior cavity into which reactant gas is introduced, a tip of the inner nozzle being recessed from the vacuum chamber port within the outer nozzle interior cavity, and a microwave discharge device configured about the apparatus for generating a discharge in the carrier gas and reactant gas only in a portion of the outer nozzle interior cavity extending from approximately the inner nozzle tip towards the vacuum chamber. A supersonic free jet of carrier gas transports vapor species generated in the microwave discharge to the surface of the substrate to form a thin film on the substrate. The substrate can be translated from the supersonic jet to a second supersonic jet in less time than needed to complete film formation so that the film is chemically composed of chemical reaction products of vapor species in the jets.

High pressure electronic common-rail fuel injection system for diesel engines

Abstract: A fuel injection system having a novel electromagnetic-actuated fuel pump in which four pumping elements, equally-spaced around a camshaft are mounted such that a pair of opposed pumping elements alternate to deliver pressure to a high pressure common rail with a second pair of pumping elements. In one embodiment of the invention the pumping elements are mechanically actuated, in another they are electronically actuated. The high pressure common rail is adapted to reduce surges in the fuel pressure from the pump up to levels of 20,000 psi. The common rail has a relief valve for controlling the maximum pressure in the common rail chamber. The electromagnetic injection nozzle has a needle valve that is closed by pressure in a balancing chamber having a reduced pressure level less than that of the pressure required to open the valve. When the supply fuel flow is blocked, the valve is closed by a spring, assisted by the pressure in the balancing chamber which overbalances the needle valve when the nozzle pressure has dropped by the termination of the supply fuel flow.

Simulation of fluid flow inside a continuous slab-casting machine

Abstract: A finite element model has been developed and applied to compute the fluid flow distribution inside the shell in the mold region of a continuous, steel slab-casting machine. The model was produced with the commercial program FIDAP, which allows this nonlinear, highly turbulent problem to be simulated using the K- e turbulence model. It consists of separate two-dimensional (2-D) models of the nozzle and a section through the mold, facing the broad face. The predicted flow patterns and velocity fields show reasonable agreement with experimental observations and measurements conducted using a transparent plastic water model. The effects of nozzle angle, casting speed, mold width, and turbulence simulation parameters on the flow pattern have been investigated. The overall flow field is relatively insensitive to process parameters.

Method and apparatus for the injection molding of metal alloys

Abstract: A method and apparatus for injection molding a metal alloy wherein the alloy is maintained in a thixotropic, semi-solid state in a reciprocating extruder at temperatures above its solidus temperature and below its liquidus temperature in the presence of shearing and then injected as a thixotropic slurry into a mold to form a useful product. Following completion of the injection molding stroke the nozzle of the extruder is sealed by a solidifying a portion of the residue of the alloy remaining in the nozzle.

Paint dispensing apparatus

Abstract: Apparatus for sealing the colorant-dispensing nozzles of machines adapted for coloring paint base material. Container assemblies of the machine provide storage of the colorants and may include metering apparatus to discharge preselected amounts of colorant through the nozzle into a quantity of paint base material. Flow control valves on the container assemblies block the discharge of colorant material from the metering apparatus. A sealing valve is attached to each nozzle to block the free end of the nozzle against air intrusion.

Electrically actuated variable flow control system

Abstract: An electrically-actuated liquid spraying system for controlling the volumetric flow through pressure-atomization spray nozzles is disclosed. Each nozzle is attached to a direct acting, in-line solenoid valve which is connected to a liquid supply at constant pressure. The valve is excited by square wave pulses of variable frequency and duty cycle to reciprocate between its fully open and closed positions and thereby control the flowrate over a range without changing droplet size and spray pattern. The frequency and duty cycle of the square wave pulses are varied and controlled by feedback data of relative target movement, size, shape and other factors as well as by gated sampling of the dynamic pressure in a region between the valve seat and nozzle orifice.

Beverage dispensing nozzle

Abstract: An improved nozzle for beverage dispenser assures a high flow rate (for example, approximately 6 oz/sec or more), while maintaining a high quality beverage. An accumulator chamber reduces the turbulence of the incoming liquid to reduce carbonation loss. The nozzle converts high upstream liquid velocities to very low liquid velocities within the nozzle without an attendant high pressure loss across the nozzle. The nozzle is provided with a syrup accumulator chamber and a wide orifice syrup diverter which allow syrup to gently mix with a first portion of soda water substantially simultaneously during the dispense cycle and at substantially the same relative velocity. Thereafter the mixture of syrup and the first portion of soda water is mixed with a second portion of soda water.

Dry disposable nozzle assembly for medical jet injector

Abstract: A dry, disposable, low-cost nozzle assembly for a spring-powered medical injector power unit comprises a generally cylindrical molded plastic nozzle body which is removably attached to a medical injector module and it includes a longitudinal bore of a predetermined diameter and terminating in a conical segment short of the end surface thereof. A counterbore of a fine diameter is then formed between the apex and the end of the nozzle member, forming the ejector orifice. A seal member fits within the bore of the nozzle body and releasably attaches to the power unit's plunger. The seal member includes a conical tip dimensioned to fit with close tolerance in the conical segment of the body portion of the nozzle.

Male luer lock medical fitting

Abstract: A male luer lock fitting, having an elongated nozzle and an internally threaded locking ring mounted around the nozzle. The locking ring has complete freedom to rotate about the nozzle axis, and limited freedom to translate along the nozzle axis. The length of the nozzle which extends outward from locking ring is chosen so that the inventive device is capable of piercing commonly used medical fluid container ports. The nozzle and locking ring are designed to have relative dimensions which enable a user to disconnect the inventive device easily from a female luer lock. Preferably, the inventive device is dimensioned to meet the ANSI/HIMA MD70.1 and ISO standards.

Method and device for coating

Abstract: The invention relates to metallurgy. The proposed method for coating of articles provides for introducing into a gas flow the powder of a material chosen from a group consisting of metals, alloys and their mechanical mixtures, or dielectrics, and having a particle size of 1 to about 50 νm, in a quantity sufficient to ensure a mass flux density of the particles of 0.05 to 17 g/sec.cm2, so as to form a gas-powder mixture which is directed on the surface of the article, the gas flow being given a supersonic speed and being formed into a supersonic jet of a desired profile providing for a speed of the powder particles in the gas-powder mixture of 300-1,200 m/sec. A device for implementation of the method comprises a doser-feeder (1) and, interconnected to each other, a bunker (2) for the powder, a means for dosing it consisting of a horizontally mounted drum (9) with recesses provided along a spiral line on its cylindrical surface (9'), a mixing chamber (3), a nozzle (4) intended for acceleration of the powder particles and connected to the mixing chamber (3), a compressed air source (5) connected to a means for feeding the compressed air to the mixing chamber (3), a flow regulator (11) for the powder particles mounted in relation to the cylindrical surface (9') of the drum (9) with a gap (12) ensuring the required mass flow of the powder, an intermediate nozzle (13) coupled with the mixing chamber (3) and connecting through its inlet pipe (8) to the means for feeding the compressed air, and a baffle (15) mounted on the bottom of the bunker (2) and in close proximity to the cylindrical surface (9') of the drum, the nozzle (4) for acceleration of the powder particles having a supersonic design and being provided with a profiled channel (18).

Distribution nozzle apparatus for automatic chemical analyzer

Abstract: In an automatic chemical analyzer, a plurality of reagent containers are arranged annularly in a table and a reagent distribution nozzle unit is located between reaction cells and reagent containers and substantially at the center of an arcular array of container. In the nozzle unit, arm is secured to shaft which is vertically displaceable and rotatable. The arm is provided with a tiltable arm head and a nozzle for withdrawing a reagent from the reagent container is fixed to the arm head. The arm head and nozzle is tilted and a suction port of nozzle is shifted from a position over the reagent container to a position over draining groove, when the shaft is rotated.

Investigation of two plane paralleltiinven ilated jets

Abstract: Measurements of mean velocity components, mean flow direction, turbulent intensities and Reynolds shear stress were made with a split film probe of hot wire anemometer to investigate the flow field generated by two identical jets of air issuing from plane parallel nozzles in a common end wall and mixing with the ambient room air. Due to the sensitivity of the split film probe to the flow direction, the reverse flow in the converging region was detected by the split film probe and observed by flow visualization. The mean velocity approaches self-preservation in both the converging and the combined regions, while the turbulent intensities and Reynolds shear stress approach self-preservation in the combined region only. The trajectory of the maximum velocity is almost unchanged by variance of nozzle spacing in the converging region. The distance of the merging point from the nozzle exit increases linearly with nozzle spacing. The spread of the converging jet increases more rapidly than that of the combined jet.

Apparatus for pretreating cells for flow cytometry

Abstract: A plurality of open-top sample tubes (16), each containing a sample liquid containing cells to be treated, are removably mounted on a disklike sample carrier (14) which is rotatable about a vertical axis for centrifuging the samples. Disposed above the sample carrier are a set of fixed reagent supply nozzles (46) for dropping a desired reagent or reagents into the sample tubes, and at least one supply-discharge nozzle (48) movable into and out of the successive sample tubes. A hydropneumatic circuit (63; 163; 363) is coupled to the supply-discharge nozzle (48) for intimately intermingling the samples and the reagents and for rinsing the supply-­discharge nozzle and other required parts. In an alternate embodiment a single supply-discharge nozzle (48) is employed for reagent supply into the sample tubes, for intermingling the samples and the reagents, and for rinsing.

Fluid dispensing nozzle including in line flow meter and data processing unit

Abstract: An improved apparatus for dispensing fuel and the like is disclosed including a display unit and a data processing system. Flow of fuel is montitored and the information relating to amount, price, etc., may be displayed on a display unit mounted directly on the nozzle. The moving mechanical parts such as the valve are readily separable from the outer handle of the nozzle so that if a customer inadvertently drives a vehicle away with the nozzle still inserted in the gasoline tank, the costly mechanical components of the valve are retained at the gasoline service station.

Liquid coating device

Abstract: A liquid coating device for coating a solution on a substrate to form a film includes a chuck for rotatably supporting the substrate, a nozzle for supplying the solution on the substrate, a heater provided in the nozzle for changing a temperature of the solution, a sensor for measuring a temperature of an ambient atmosphere of the substrate, and a controller for controlling the heater according the measured temperature. Thus, a solution having a temperature corresponding to the temperature of the ambient atmosphere is supplied from the nozzle to the substrate.

Method 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.

Cutting head for water jet cutting machine

Abstract: A cutting head for a water jet cutting machine has a body removably supporting a holder with an orifice element, and insert with a chamber, and a nozzle having a passage in alignment with the water flow path through the head. The holder has a cone shaped surface that fits into a complimentary shaped cone recess to align the aperture of the orifice element with the axis of a water inlet chamber. The insert is retained within a transverse bore in the body to align its chamber with the axis of the aperture. A griping collet holds the nozzle on the body and aligns the passage of the nozzle with the axis of the aperture so that aperture, insert chamber, and the passage of the nozzle are linearly aligned with each other to form the water flow path through the nozzle.

Apparatus and method for chemically analyzing liquid sample

Abstract: In a chemical analyzing apparatus, sample containers (54) reagent containers (54) cleaning port (7), a waste port (6), reaction containers (58), and a measuring cuvette (4) are arranged along one circumference. The sample con­tainers and the reagent containers are placed in a common area (8). An operator inputs from a keyboard (14) information iden­tifying those positions in the common area (8) at which sam­ples and reagents are loaded, for filing the information into a microcomputer (3). The filed information is displayed on a screen (13). The maximum total number of containers capable of being set in the common area (8) is constant. But, the numbers of sample and reagent containers (54) can be changed through the keyboard (14) such that when the number of sample con­tainers is large, the number of containers allocated for the reagents is reduced, or vice versa. A pipetting nozzle (9) is turned along the circumference and can be moved vertically at required positions. Transfer operations for various liquids are all carried out by a single nozzle. The nozzle (9) is operated to impart a sample and a reagent to one reaction con­tainer (58). Then, the operation of sucking a mixed solution from the reaction container (58) into the nozzle (9) and re­turning the sucked solution to the reaction container (58) again is repeated for full mixing. The reaction solution is supplied to the cuvette (4) by the nozzle (9) and subjected to measurement of extinction, fluorescence or scattered light. The reaction solution after the measurement is discarded to the waste port (6) by the nozzle (9). The nozzle is positioned at the cleaning port (7) on demand, whee the nozzle is cleaned by discharging a cleaning liquid through itself.

Combustor and method of operating same

Abstract: A combustor comprises a passage area changing mechanism which relatively moves a flame holder relative to a premixed combustion nozzle in an axial direction so that the area of passage for premixed gas between an injection edge of the premixed combustion nozzle and a peripheral edge of the flame holder can be changed. Stable combustion can be maintained over a wide load range and reduction in NOx can be achieved.

Multi-cavity, co-injection molding apparatus

Abstract: An injection moulding apparatus (10) includes similar co-injection modules (12) each provided with common supplies (238-242) and supplied with different polymer materials at intermediate pressure by common plasticisers (14-18). Each module has a co-injection nozzle assembly (70) in wich each nozzle (148-154) is supplied with polymer at injection pressure by an injector (208) which receives polymer through a non-return valve (220). The injector is mounted alongside the nozzle on a polymer transfer plate (138-146), and has the position of its piston (212) controlled by a hydraulic actuator (214) under the control of a dedicated micro-processor (164) in accordance with a stored injection control program. Each polymer is injected by an injector (208) directly into the associated nozzle (148-154) and is controlled solely by injector operation, and without the use of any control valve between the injector and the nozzle. The module micro-processors are controlled by a host processor which organizes the operations of the apparatus.

Method and apparatus for injection molding of multilayer preforms

Abstract: A method of and apparatus for forming multiple layer preforms wherein the various layers may be varied as to number, material, thickness and position in the preform by controlling the injection of the specific materials as to timing, quantity and rate of delivery. Most specifically, a featured aspect is the ability to simultaneously deliver to an injection nozzle and through such injection nozzle into a preform mold cavity two or more molten plastic materials simultaneously. This is possible by way of the multiple gate nozzle and a plurality of separately operable metering pots all controlled by way of a timing device. The timing device may also control the rate of the dispensing an individual material from each of the metering pots.

Device for smoothing the sheets on the impression cylinder of a sheet-fed rotary printing machine

Abstract: The additional patent describes a device for smooth placing of sheets (1) on the impression cylinder (3) ahead of the printing gap (5) of a sheet-fed rotary offset printing machine, in which device a lance nozzle (8), which can be directed towards the circumference of the impression cylinder (3) and extends over a substantial part of the width of the impression cylinder (3), is provided for pressing the sheet (1) on by the dynamic effect of flowing air. This lance nozzle (8) is mounted with spacing ahead of the printing gap (5) so as to oscillate about an axis (9) of oscillation parallel to the axis of the impression cylinder (3) and can be coupled to a drive which moves the lance nozzle (8) back and forth in phase with the machine, oscillating in the running direction of the sheet (1). In constrast to the principal patent, the lance nozzle (8) has a shape in which the ends are offset relative to a central region in the running direction of the sheet so that a centrally leading smoothing of the sheet (1) takes place from the leading edge to the trailing edge of the sheet and from the centre of the sheet to the two outsides. Preference is given to a lance nozzle (8) which has an arrow-type shape directed with the tip counter to the running direction of the sheet.

Gas turbine combustor and methodd of operating the same

Abstract: A gas turbine combustor and a method of operating the gas turbine combustor, with the gas turbine combustor comprising a combustion sleeve, a combustion sub-chamber disposed at an upstream side of the combustion sleeve and having an air and fuel supply system, and a combustion main chamber disposed on a downstream side of the sub-chamber and having an air and fuel supply system. The combustion sub-chamber and combustion main chamber are formed in such a manner that the start-up of the gas turbine is effected by the hot combustion gas generated in the sub-chamber. The combustion sub-chamber is provided with an inner sleeve protruding from a side wall of the sub-chamber such that a tip of the inner sleeve is located in the vicinity of a downstream end of the sub-chamber, and a fuel nozzle is provided in a tip of the inner sleeve for increasing the fuel-to-air ratio during an initiating period of an increase in the gas turbine rotation speed.

Nozzle band overhang cooling

Abstract: The present invention is a unique nozzle assembly for a high pressure turbine of a gas turbine engine. The nozzle assembly includes a series of circumferentially spaced vanes and a nozzle band. The nozzle band supports the vanes and includes a mounting flange extending radially from the nozzle band and adapted to be secured to the gas turbine engine. The nozzle band has an overhang portion axially downstream of the mounting flange. A pin fin bank is formed within the overhang portion for allowing cooling fluid to flow therethrough to cool the overhang portion.

Two-fluid nozzle

Abstract: A two-fluid nozzle, constituted by a gas inlet and a liquid inlet; a first mixing chamber having a gas feed element connected to the gas inlet for feeding a gas along an axial center line in a direction toward a discharge end of the nozzle and having a liquid feed element for feeding a liquid into the outer periphery of the gas at the downstream end of the gas inlet; a substantially uniform diameter rectifying chamber opening out of the first mixing chamber and extending along the axial center line toward the discharge end for receiving the mixture of gas and liquid and conveying it therealong; a second mixing chamber having a larger diameter than the rectifying chamber and into which the downstream end of the rectifying chamber opens, the second mixing chamber having a wall face at the downstream end thereof spaced from and opposed to the downstream end of the rectifying chamber and against which the outer peripheral portion of the mixture of gas and liquid discharged into the second mixing chamber from the rectifying chamber collides; and a nozzle tip on the downstream end of the second mixing chamber having a discharge opening at a discharge end thereof and a jetting chamber extending along the axial center line from the second mixing chamber to the discharge opening, the nozzle tip having an end face portion in which the discharge opening is located having a hemispherical shape and a cylindrical peripheral wall around the base of the hemisphere, the discharge opening being a uniform width slit extending across the hemispherical shape end face portion and into the cylindrical peripheral wall in a diametrically extending plane, the ends of the slit having a circular arc or a V-shape.

Fuel injection device for diesel engines

Abstract: A Diesel fuel injection device has a pressure accumulation piping for accumualting a fuel at a high pressure and an injector for injecting the fuel supplied by the pressure accumulating piping. The injector including a nozzle needle operative to open and close an injection orifice and a three-way solenoid valve operative to control the fuel pressure acting on the nozzle needle. The three-way solenoid valve is controlled to actuate the nozzle needle and to cause the fuel in the pressure accumulation piping to be injected through the injection orifice. A control valve is provided to control the injection rate characteristic to provide a boot-type injection characteristic. A boot type invention characteristic that is defined by a first characteristic in which the injection rate is substantially constant for a predetermined time period, a subsequent second characteristic in which the injection rate is gradually increased from the first characteristic, and a subsequent third characteristic in which the injection rate is suddenly decreased from the second characteristic; whereby operation noise is be reduced.

Electrical component placing apparatus and method of placing electrical component

Abstract: An electrical component placing apparatus has an XY-axis table, including motors for moving the table in the X and Y axis directions between an electrical delivery unit and a printed circuit board. A pick and place head is mounted to the XY-axis table for movement therewith. The pick and place head has a body unit and a nozzle shaft rotatably mounted on the body unit for rotation about a vertical axis. The nozzle shaft has vacuum nozzles disposed on opposite ends thereof for picking and placing electrical components. A motor is operationally connected to the nozzle shaft for rotating the shaft about its axis. A further rotating device rotates the nozzle shaft in the vertical plane about a horizontal axis perpendicular to the vertical plane. A recognition unit is provided for externally recognizing an electrical component after the electrical component has been picked up by the vacuum nozzle and the nozzle shaft has been rotated by the rotating device. The recognition unit detects the amount of correction necessary in the X, Y and rotational directions for correct positioning of the electrical component on a circuit board. The motor connected to the nozzle shaft makes the rotational correction, while the X and Y corrections are made by adjustments in movement of the XY-axis table. Also, the adjustments can be made by a plurality of position restricting pawls which press the side faces of an electrical component.

Phase change injection nozzle

Abstract: A high efficiency phase change nozzle has a body with primary orifices, a pilot nozzle extends upstream from the body and has a pilot orifice and central cavity through which a pilot flow of liquid is flashed to the solid state, cooling the pilot nozzle, thereby precooling the liquid before it flows through the primary orifices. An exit nozzle, in conjunction with a housing, assists in continuing the phase change of the mixture exiting the primary orifices and with dispersing the mixture into the downstream cavity.