Showing papers on "Nozzle published in 1983"

Fuel injection pump

Abstract: PURPOSE:To improve an engine starting property and reduce the generation of graphite by electrically controlling opening/closing of an overflow valve for allowing part of fuel which is fed under pressure into a fuel injection nozzle to escape, in accordance with the operating condition of a diesel engine CONSTITUTION:Fuel which is fed under pressure from a feed pump 31 driven by a diesel engine is fed into a fuel injection nozzle 32 Part of the fuel is allowed to escape into a fuel tank 33 via an overflow valve 15 provided in a pump housing 11 In this structure, in the overflow valve 15, a poppet 20 for opening/closing an inlet port 18 is provided inside a valve chamber 17 formed on a valve body 16 The poppet 20 is pressed by a pressure regulating plunger 22 via a pressure spring 21 while the drive of the pressure regulating plunger 22 is controlled by means of a control unit 34 via an electric actuator 23

Sanitary washing apparatus

Abstract: When a user sets water power using a water power adjustment switch in a remote control device, a controller controls the period of pressure fluctuations, the width of pressure fluctuations, and the central pressure of the discharge pressure of a pump on the basis of a signal transmitted by radio from the remote control device. When the user sets the divergent angle of washing water using a washing area adjustment switch in the remote control device, the controller controls the divergent angle of the washing water sprayed from a posterior nozzle on the basis of the signal transmitted by radio from the remote control device. Consequently, the washing water supplied to a side surface of a cylindrical swirl chamber from a first flow path in the posterior nozzle is sprayed from a spray hole as dispersed spiral flow, and the washing water supplied to a lower part of the cylindrical swirl chamber from a second flow path in the posterior nozzle is sprayed from the spray hole as linear flow.

Dental spray handpiece

Abstract: The present invention is directed to a dental spray handpiece for agents such as air and water having a nozzle member with a discharge orifice at one end and a connecting element at the other end and a housing forming a grip piece for the dental handpiece containing an arrangement for controlling flow of the agents and a connection to a supply hose with the nozzle and having a coacting element forming a rotary joint characterized by the nozzle member having a light conductor extending from the discharge orifice up to the rotary joint and a light source being provided in the vicinity of the rotary joint and in optical communication with the other end of the light conductor so that light is conducted through the nozzle and projected out of the nozzle adjacent to the discharge opening

High-Volume Dichotomous Virtual Impactor for the Fractionation and Collection of Particles According to Aerodynamic Size

Abstract: A prototype dichotomous virtual impactor (DVI) using a single acceleration nozzle, operating at approximately 500 1/min, and having an aerodynamic particle outpoint diameter of about 2–3 μm has been constructed and tested. Under these conditions the flow through the acceleration nozzle is calculated to be turbulent. This sampler was calibrated with a monodisperse aerosol, and the measured particle size-dependent collection efficiencies demonstrate that the sampler size fractionates atmospheric particulate matter as efficiently as the low-volume dichotomous virtual impactors. Analysis of test data indicates that the high-volume sampler can be described by classical impaction theory. These data also indicate that over the range of Reynolds numbers from 24,000 to 81,000 there is little, if any, dependence of inferred acceleration nozzle turbulence on the performance characteristics of the sampling system. A comparison of the concentration of atmospheric particulate matter, sulfate, and calcium on the fine fi...

Method of and apparatus for multi-layer viscous fluid deposition such as for the application of adhesives and the like

Abstract: This disclosure is concerned with independent fluid dispensing by a multi-slot cavity nozzle with opposing zig-zag fluid path baffle-diversion operation, generating a pair of adjacent line fluid depositions upon a web moving past the nozzle, and enabling the separate but simultaneous use of adhesives and other fluid media of different characteristics and in widely flexible multi-layer coating patterns including superposed, side-by-side, spaced and other multi-layer patterns.

Measurements of the Spray Angle of Atomizing Jets

Abstract: Liquid jets are considered issuing from single-hole, round nozzles into quiescent gases under conditions such that they break up into a well defined conical spray immediately at the nozzle exit plane. The initial angles of such sprays were measured at room temperature by a spark photography technique. Water, n-hexane, and n-tetradecane at pressures from 11.1 MPa to 107.6 MPa were injected into gaseous N2 at pressures from 0.1 MPa to 4.2 MPa through sixteen nozzles of different geometry. Under the test conditions, the spray angle is found to be a strong function of the nozzle geometry and the gas-liquid density ratio and a weak function of the injection velocity. The measured trends are then discussed in the light of possible mechanisms of the breakup process and shown to be compatible with the aerodynamic theory of surface breakup if modified to account for nozzle geometry effects.

Method and apparatus for developing resist film including a movable nozzle arm

Abstract: An apparatus for developing a resist film coated on a rotatable base plate, comprising means for supporting and rotating the base plate and nozzle means for feeding a developer onto the resist film. The nozzle means comprises a nozzle arm extending over the base plate and having a plurality of nozzles arranged along the length of the nozzle arm. Disclosed also is a method for developing a resist film coated on a rotatable base plate with a developer fed from a plurality of nozzles arranged on a nozzle arm along the length of the nozzle arm. The method comprises feeding the developer from th respective nozzles onto the resist film while rotating the base plate and while scanning the nozzle arm over the resist film.

Apparatus for injection molding and injection blow molding multi-layer articles

Abstract: Multi-co-injection nozzle injection molding apparatus for an injection molding machine for injection molding a multi-layer plastics article or container, comprising a plurality of co-injection nozzles, means associated with the nozzles to channel each material stream which is to form a layer of the article separately to each nozzle, means for moving the materials streams along their respective channels to their respective nozzles and means for combining in each nozzle the streams moved thereto, to form combined streams in the nozzles for injection into associated injection mold cavities. Each of the channels preferably provide substantially the same material flow stream travel path for each material stream of the same material channeled to each nozzle. Each co-injection nozzle has an axial central channel and a plurality of flow stream passageways with orifices in communication with the central channel. Preferably, valve means are cooperatively associated with and operative within each co-injection nozzle for there preventing and allowing the flow of respective materials streams from the passageway orifices into the central channel.

Exhaust mixing in turbofan aeroengines

Abstract: The core engine of a mixed exhaust turbofan aeroengine is provided with a conical afterbody. The normal outlet guide vanes which remove residual swirl from the turbine exhaust gases are dispensed with and replaced by ducts within an afterbody having entries which receive the hot gases in the same manner and at the same angle as the passages between the guide vanes would have done. The hot ducts, whose aspect ratio is preferably transformed between their upstream and downstream ends, extend through the afterbody in substantially straight paths to avoid aerodynamic losses, and intersect its conical surface to form preferably slot-like nozzles from which the turbine exhaust gases issue as flattened jets. The exhaust jets partake of the original axial and tangential/swirl velocity components of the turbine gases, plus a radial component (consequential upon the orientation of the ducts) to achieve good penetration of the bypass stream. Satisfactory mixing between the bypass stream and the jets is achieved because of the radial and tangential velocity components and because the bypass stream flows in sheets between the jets. No net swirl in the mixed stream through the propulsion nozzle is ensured by counter-swirling of the bypass stream before mixing commences.

Premixing burner with integrated diffusion burner

Abstract: Burner system for gas turbine combustion chambers having a pre-mixing burner with an integrated diffusion burner, where: the pre-mixing burner has a pre-mixing chamber bounded at the downstream end by a flame retention baffle, into which chamber a main fuel nozzle and a feeding device for combustion air open; the diffusion burner has a pilot fuel nozzle arranged in the central region of the flame retention baffle; and where a fuel control device controls the total amount and the partial amounts of the fuel fed to the main fuel nozzle and the pilot fuel nozzle as a function of the load of the gas turbine such that the diffusion burner can be operated exclusively until the idling speed or a small partial load is reached, and thereafter the diffusion burner and the pre-mixing burner can be operated together, characterized especially by the fact that the entire combustion air required for the operation of the diffusion burner can be fed-in exclusively via the pre-mixing chamber, and that the fuel control device controls the total amount and the partial amounts of the fuel supplied such that the pre-mixing burner can be operated exclusively in the upper load range.

Free stream noise and transition measurements in a Mach 3.5 pilot quiet tunnel

Abstract: Free stream fluctuating pressures are determined from hot-wire measurements in a Mach 3.5 pilot quiet nozzle over a unit Reynolds number range from 10-60 million per meter. Further, the transition Reynolds numbers on a sharp tip 5 degree half-angle cone at zero angle of attack are obtained over the same range of unit Reynolds numbers from equilibrium temperature measurements on the cone. Results show that the nozzle provides noise levels in the upstream regions of the test rhombus that are substantially lower than in conventional nozzles. The normalized rms levels of the fluctuating static pressures are found to vary from extremely low values of less than 0.03% up to about 0.8% depending on the unit Reynolds number, the axial location in the test rhombus, and the bleed slot flow. By opening the boundary-layer bleed flow, the wall boundary layers over upstream regions of the nozzle become laminar and the absence of high frequency radiated noise then results in cone transition Reynolds numbers that are in the range of free-flight data. As the unit Reynolds numbers are increased, the nozzle wall boundary layers become transitional and turbulent, and the noise increases to peak levels of about 0.5% with significant energy up to 150 KHz. The cone transition Reynolds numbers then decrease to values that are in the range of those measured in conventional wind tunnels.

Fluidic tuning of impulse jet devices using passive orifices

Abstract: A nozzle plate for impulsive jet devices is proposed where the quality of ejected droplets is improved by means of additional non-emitting orifices. These orifices may act as fluid accumulators and tuned or untuned absorbers of pressure disturbances to optimize drop quality and reduce fluidic crosstalk between adjacent drop generators. The presence of these orifices permits additional degrees-of-freedom in the design of high-quality impulsive jet devices. Sufficient crosstalk reduction results that crosstalk reduction barriers can be eliminated.

Self-supporting pipe rupture and whip restraint

Abstract: A self-supporting pipe rupture and whip restraint system (10) for a process fluid pipe (12) of a nuclear reactor steam generator pressure vessel (14) includes a guard pipe (26) concentrically disposed about the process pipe (12) so as to entirely encase the process pipe (12) from the pressure vessel nozzle 18 to a terminal end fitting component (36) disposed exteriorly of the reactor facility building wall (32), the guard pipe (26) being integrally fixed to the process pipe (12) through means of the nozzle (18) and the component (36). Under postulated rupture conditions of the process pipe (12), pipe whipping of the process pipe (12) is restrained by the guard pipe (26), and the process fluid effluent from the process pipe (12) is contained within the guard pipe (26). Leak detection apparatus (50) is operatively associated with the annular space (30) defined between the process pipe (12) and the guard pipe (26) so as to detect ruptures or fractures within either the process pipe (12) or the guard pipe (26). The provision of a 90° elbow bend section (52) within the system also facilitates thermal expansion of the process pipe (12) relative to the guard pipe (26) without requiring conventional expansion joints or expansion bellows.

Cement injection device

Abstract: A device for controlling the injection of a cement into a cavity is provided which is particularly useful in the practice of total hip arthroplasty. A canister holds a standard cement syringe and supports a retracting assembly which withdraws a nozzle of the syringe into the canister. The device ensures that the tip of the nozzle remains at or very near the meniscus of the rising cement column so that the cement flows primarily radially into the cavity by withdrawing the nozzle into the canister as the cement is injected. Additionally, a pressure release mechanism permits the syringe to migrate as a unit independently of the retracting assembly to maintain the tip of the nozzle at the meniscus of the rising cement column.

Injector for bone cement

Abstract: The injector is provided with an injection nozzle in the bottom of the cylinder tube for low pressure operation wherein large quantities of bone cement are to be injected. The injector also has a nozzle element which can be releaseably attached to the cylinder tube for high pressure injection. This nozzle element has a nozzle tube of reduced cross-sectional area through which a ram passes in the form of a piston in order to provide for high pressure injection.

Drying apparatus with deodorizing system for a printing machine

Abstract: A drying apparatus with a deodorizing member for a printing machine including a hot blast nozzle for directing a hot blast against a web of printed material for drying the printed material. The deodorizing member includes a preheating chamber provided with a burner for preheating a collective process gas including a portion of a used process gas already used during the drying operation. A catalytic layer is provided for oxidizing the used process gas and is operatively connected to a fan for supplying the used process gas through the catalytic layer. A duct circuit is provided for dividing a treated process gas including a hot blast obtained by the treatment with the deodorizing member into two parts and discharging one portion of the two parts and sub-dividing the other portion into two parts and introducing one part thereof to an odor collective chamber connected to the preheating chamber and introducing the other part to a hot blast mixing chamber into which the other part of the foregoing used process gas is supplied. In addition, a hot blast circulating blower is provided for supplying a mixture process gas of the treated process gas and the used process gas in the foregoing hot blast mixing chamber to the hot blast nozzle.

Fuel injection nozzles

Abstract: An inwardly opening fuel injection nozzle includes a first spring (21) which is coupled by means of a push rod (22) to the valve member (18) of the nozzle. The nozzle includes a second spring (28) positioned betweeen the first spring and the valve member and acting upon a slidable abutment member (29) which is engaged by the valve member (18) after a predetermined movement of the valve member away from a seating. The valve member is lifted against the first sprng by fuel under pressure supplied to an inlet (14) to allow restricted fuel flow through an outlet (16A) and further against the action of both springs as the pressure at the inlet increases to allow unrestricted flow through the outlet.

Method and apparatus for sensing clogged nozzle

Abstract: A method and apparatus for sensing and signalling a clogged nozzle condition in a spray gun of the type which includes a valve located adjacent the nozzle. The gun includes a restrictor (25) located in the liquid flow path upstream of the valve (14) and a pressure transducer (31) located between the restrictor (25) and the valve (14) for measuring pressure drop when the valve of the gun is opened. A pressure drop of less than a predetermined amount is indicative of a clogged nozzle condition.

Integrated gas/steam nozzle

Abstract: A first stage gas nozzle for directing a combustion gas stream onto the rotatable blades of a gas turbine contains a plurality of spaced air-foil shaped vanes, each vane containing a steam nozzle to direct steam as a thermal barrier over the exterior surfaces of the vane. A steam nozzle in the trailing edge of each vane directs heated coolant steam from the interior of the vane to the gas streams. Disruption of the laminar steam film in the trailing edge steam nozzle such as by the provocation of a shock wave or by diffusion separation exposes the bare surfaces of the trailing edge steam nozzle to the coolant steam thereby improving heat transfer at the extreme trailing edge of the vane.

Atomizing apparatus employing a capacitive piezoelectric transducer

Abstract: An atomizing apparatus comprises a body having a chamber into which liquid is supplied. A nozzle member is secured to the body to define a front vibrating member of said of the chamber, the nozzle member having at least one nozzle opening. A capacitive piezoelectric transducer is secured to the nozzle member for producing pressure rises in the liquid to cause the portion of the liquid in proximity to the nozzle opening to be ejected therethrough to the outside. The piezoelectric transducer is connected to an inductance element to form a resonant circuit. An amplifier is connected with the resonant circuit to form a self-oscillating loop to amplify the signal in the loop to sustain oscillation at a frequency variable as a function of the temperature-dependent capacitance of the piezoelectric transducer.

Trigger-type sprayer

Abstract: The trigger-type sprayer(10) includes a trigger(22) rockably attached to one end of a housing(16) which attaches to a liq container(12) A cylinder(18) is supported on the housing to face an orifice(32) in a nozzle(34) formed on the trigger A suction tube(24) is attached to the cylinder's other end A piston(20) slidable within the cylinder has one end connected to the nozzle Dependent upon the rocking direction of the trigger, the nozzle and suction tube are closed or opened by valves(44,54)

Ultrasonic liquid ejecting unit and method for making same

Abstract: An ultrasonic liquid ejecting unit comprises a piezoelectric transducer coated with a conductive film on each of its front and rear surfaces, a nozzle plate secured to the transducer to form a bimorph vibration system and a body having a liquid chamber defined by the nozzle plate in pressure transmitting relation with the liquid in the chamber. The nozzle plate is coated on each of its front and rear surfaces with a pattern of adjoining regions of cement-active and cement-inactive properties. The cement-active region on the front surface conforms to the rear surface of the transducer and the cement-active region of the rear surface conforms to a contact surface of the body. When fabricating the unit, a cementing material in liquid phase, such as molten solder, is applied to each surface of the nozzle plate to exclusively wet the cement-active regions prior to contacting the nozzle plate to the transducer and to the body.

Critical Flashing Flows in Nozzles With Subcooled Inlet Conditions

Abstract: Examination of a large number of experiments dealing with flashing flows in converging and converging-diverging nozzles reveals that knowledge of the flashing inception point is the key to the prediction of critical flow rates. An extension of the static flashing inception correlation of Jones (16) and Alamgir and Lienhard (17) to flowing systems has allowed the determination of the location of flashing inception in nozzle flows with subcooled inlet conditions. It is shown that in all the experiments examined with subcooled inlet regardless of the degree of inlet subcooling, flashing inception invariably occurred very close to the throat. A correlation is given to predict flashing inception in both pipes and nozzles which matches all data available, but is lacking verification in intermediate nozzle geometries where turbulence may be important. A consequence of this behavior is that the critical mass flux may be correlated to the pressure difference between the nozzle inlet and flashing inception, through a single phase liquid discharge coefficient and an accurate prediction of the flashing inception pressure at the throat. Comparison with the available experiments indicate that the predicted mass fluxes are within 5 percent of the measurements.

Ink jet recording head

Abstract: An on-demand type ink jet recording head. The ink jet recording head includes a substrate having a plurality of pressurization chambers of substantially rectangular configuration disposed thereon. Ink supply passages and nozzles are provided for each pressurization chamber. Each pressurization chamber also has a vibratory plate and a piezoelectric element which cooperate to change the volume of the pressurization chamber to cause ink to be ejected out of the respective nozzles thereof. Each nozzle has an equivalent nozzle length of 1 mm or less. Each pressurization chamber has a width of 1 mm or less and a length of 1 mm or more. The vibratory plate has a thickness of 200 μm or less and the piezoelectric elements have a thickness of 200 μm or less.

Drop-on-demand method and apparatus using converging nozzles and high viscosity fluids

Abstract: A drop-on-demand ink jet printing method and apparatus in which the print head has an ink cavity which is filled with ink, and which has a nozzle designed so that ink does not flow out under static conditions. An electromechanical transducer is selectively energized in response to print data signals so that, when energized by an electrical signal, the transducer produces a pressure wave in the ink cavity sufficient to eject one ink drop from the nozzle for each signal above a threshold value. The nozzle is a strongly convergent nozzle and the ink has a viscosity up to 100 centipoise. In the preferred embodiment, the nozzle is formed by anisotropic etching in a silicon substrate. An array of print heads produces a line of high-resolution printing as the print head array is moved across a print medium.

Exhaust gas cleaning device for diesel engines

Abstract: An exhaust gas cleaning device for diesel engines including a filter provided in an exhaust gas passage of the diesel engine for trapping particulate materials in exhaust gas passing through the exhaust gas passage, and a burner upstream of the filter for burning the particulate materials deposited on the filter. The filter has a gas inlet surface which is perpendicular to an axial direction along which the exhaust gas is passed and where the particulate materials are apt to be deposited. The burner include a fuel nozzle and a combustion chamber for effecting combustion of fuel from the fuel nozzle. A mixing chamber is provided between the combustion chamber and the filter for drawing the engine exhaust gas to mix it with combustion gas from the combustion chamber. The mixing chamber has an inlet communicating with the combustion chamber and an outlet opposite to the inlet. The gas inlet surface of the filter is exposed to the mixing chamber at the outlet.

The flow field in a suddenly enlarged combustion chamber

Abstract: The characteristics and dynamics of an abruptly expanded flow in a model combustion chamber (combustor) were investigated experimentally. The combustion chamber consisted of a plexiglass, circular duct with a suddenly enlarged section followed by a nozzle. The Reynolds number, based on the inlet duct diameter and center velocity, was 64,000. The wall pressure measurements were carried out with a laser-Doppler anemometer (LDA). Detailed profiles of mean velocities, turbulent intensities, turbulent shear stresses, and wall pressure distribution were developed. The dividing streamline, the reattachment point, and the magnitudes of the mean kinetic energy and turbulent kinetic energy were also determined.

Automatic shut-off dispensing nozzle responsive to liquid in a tank reaching a predetermined level and to a supply pressure

Abstract: An automatic shut-off nozzle has a first diaphragm responsive to the liquid in the tank being filled reaching a predetermined level to automatically stop flow through the nozzle. Flow also is automatically stopped when a second diaphragm responds to inactivation of a pump supplying the liquid to the nozzle. When a venturi poppet valve is located downstream from a main poppet valve in the nozzle, the venturi poppet valve has a bleed passage extending therethrough to enable the pressure upstream thereof and acting on the second diaphragm to be reduced to zero the pump is inactivated.