Abstract:
Die Erfindung betrifft eine Zerstäuberdüse (10) mit einem Flüssigkeitskanal (19), an den stromabwärts eine Ringmischkammer (26) fluidisch angeschlossen ist. Über einen Flüssigkeitsanschluss (12) wird dem Flüssigkeitskanal (19) eine Flüssigkeit (F) zugeführt. Die Zerstäuberdüse (10) weist außerdem einen Gasanschluss (13) auf, der an ein Gasleitungssystem (28) angeschlossen ist. Darüber wird Druckgas (L) zu einem äußeren Injektionskanal (29) und einem inneren Injektionskanal (34) geleitet. Die beiden Injektionskanäle (29, 34) münden an jeweils einer Injektionsstelle (30, 35) in die Ringmischkammer (26) ein. Die äußere Injektionsstelle (30) ist an der radial äußeren Mischkammerwand und die innere Injektionsstelle (35) an der radial inneren Mischkammerwand vorhanden. Die einströmende Flüssigkeit kann daher mit wenig Druckgas (L) in der Ringmischkammer (26) fein zerstäubt und stromabwärts der Ringmischkammer über wenigstens eine Austrittsöffnung (40) jeweils als Sprühstrahl (S) abgegeben werden.
Abstract:
Solvent-free spraying system including methods and apparatus for spraying plural component materials without requiring the use of solvents to flush out equipment or as part of the materials being dispensed. Materials sprayed can have simultaneously widely varying viscosities, pressures, temperatures and ratios between two or more respective components being combined by the spraying apparatus. Cure rates and gel times can vary widely from hours to less than 10 seconds for mixing and dispensing various plural component thermoplastic and thermosetting materials including foams, moldings and coatings made from urethanes, ureas, epoxies, polyesters, phenolics and other chemical compositions that react rapidly upon mixing of the components thereof.
Abstract:
A shower head (10C) has at least one mixing chamber (24) having an air inlet (18) for connection to a supply of pressurised air and a water inlet (22) for connection to a supply of pressurised water so that, in use, the air breaks the water up into droplets in the mixing chamber. The mixing chamber further has at least one outlet (32) so that, in use, the water droplets and air exit the shower head to form a shower of water droplets having a mean trajectory. The or each outlet is arranged so that, in use, at least a substantial proportion of the water droplets exit the shower head so that their individual trajectories on leaving the shower head are offset from the mean trajectory of the shower head and converge towards the mean trajectory of the shower head. This can result in a more uniform distribution of water droplets in the shower pattern. A single annular outlet may be provided, or a plurality of separate outlets. In order to assist in breaking up the water into small droplets, a vortex may be induced in the air and/or the water in the mixing chamber, and/or a deflector may be disposed adjacent the water inlet into the mixing chamber.
Abstract:
The invention relates to a device for injection of a liquid agent, such as fuel or reducing agent, into the exhaust line from a combustion engine. The device (1) comprises a nozzle arrangement (20) having a nozzle head (21), from which the liquid agent is injectable into the exhaust line. The nozzle arrangement (20) comprises a first conduit (22) leading to the nozzle head (21) for supply of compressed gas, preferably in the form of compressed air, to the nozzle head, and a second conduit (23) leading to the nozzle head (21) for supply of said liquid agent to the nozzle head. The nozzle head (21) is provided with at least one outlet opening (24) connected to the first conduit (22) and to the second conduit (23), through which outlet opening said liquid agent is injectable into the exhaust line under atomization thereof after mixing with compressed gas in a mixing zone (25) inside the nozzle head .
Abstract:
A method of forming droplets comprises flowing a liquid (65) through a channel (60); spreading the liquid into a thin film in the channel; and impinging the thin film with a flowing gas (100) to atomize the liquid (65) into droplets. The droplets may then be dried to produce dried particles, such as particles comprising a pharmaceutical active agent. The droplets formed by the disclosed process have improved size and/or size distribution characteristics.
Abstract:
A pressurized stream of liquid flowing into a body is divided into a plurality of angularly spaced jets (33) which are rebounded in an upstream direction prior to being guided in a generally radially outward direction by a deflector surface. During flow along the deflector surface (38), the liquid is formed into a thin and very turbulent sheet which impinges against the edge portion of a plate (42) and is shattered into small droplets. An annular curtain of pressurized air cross shears the droplets and breaks the droplets into finely atomized particles which are discharged through a spray nozzle. A cap (60) is disposed internally of a spray nozzle and effects active atomization of pressurized liquid flowing through the nozzle by creating turbulence in the liquid during the flow. Different caps may be used to create various selected spray patterns.
Abstract:
La présente invention a pour objet une unité de pulvérisation, pour la pulvérisation d'un liquide sur de la végétation, comprenant une tuyère formée par un tube (1), un atomiseur rotatif (3) et un ventilateur générant un flux d'air porteur autour de ce dernier, un système d'entraînement, des moyens d'acheminement pour acheminer le liquide jusqu'audit atomiseur apte à le fragmenter en gouttelettes. La tuyère (1) renferme un fuselage (5) entouré du flux d'air porteur et comprenant un tronçon rotatif formé par l'atomiseur rotatif (3) dont la rotation entraîne la propulsion, de préférence sensiblement perpendiculairement à l'axe longitudinal (X), des gouttelettes dans le flux d'air porteur. Elle a également pour objet un module de pulvérisation compact comprenant une telle unité et un système de pulvérisation et de pilotage comprenant une pluralité de tels modules.
Abstract:
A prosthetic heart valve includes a base and a plurality of polymeric leaflets. Each leaflet has a root portion coupled to the base, and each leaflet has an edge portion substantially opposite the root portion and movable relative to the root portion to coapt with a respective edge portion of at least one of the other leaflets of the plurality of leaflets. Each leaflet includes) at least two polymers along at least one portion of the leaflet, and each leaflet has a composition gradient of each of the at least two polymers along at least one portion of the leaflet.
Abstract:
A liquid spray device having an atomizing unit for pressurized air atomization of a liquid flow stream, a plurality of atomized liquid direction passages disposed in eccentric relation to a central liquid flow passage of the atomizing unit, a plurality of flexible tubes each communicating with a respective one of the eccentric passages, and a spray nozzle coupled to a downstream end of each tube for discharging atomizing liquid at the selected location of the spray nozzle. The illustrated atomizing unit is a multi-component assembly that includes an air and liquid supply body, an air guide for directing atomizing air, an impact adaptor defining a liquid impingement surface, and a atomized director fitting defining the plurality of eccentric atomized liquid passages. The atomizing unit may be in a form of a spray gun designed for flushing atomized liquid from the elongated flexible tubes or instantaneously shutoff.