The invention relates to a fluid premixer for mixing a first fluid and a second fluid by aspirating the second fluid into the first fluid by Venturi effect. The premixer comprises a pipe which has a first inlet for the first fluid at a first pressure and a second inlet for the second fluid to be mixed into the first fluid to form a mixture. The pipe also has an outlet for the mixture at a second pressure and a shutter movable between several positions where each position defines a distinct degree of shutting of the pipe. The premixer also includes a control element to control the position of the shutter as a function of the difference between the first pressure and the second pressure.

Adjustable venturi assemblies and methods of using adjustable venturi assemblies are disclosed. In one aspect, a venturi assembly for injecting a secondary fluid into a primary fluid flow path is provided. The venturi assembly comprises a nozzle, a constricted section in fluid communication with the nozzle, a secondary fluid conduit in fluid communication with the nozzle, and a flow adjusting device. The nozzle and constricted section together define the primary fluid flow path along a first axis. The secondary fluid conduit is for transporting secondary fluid from the secondary fluid reservoir to the constricted section along a second axis. The flow adjusting device is positioned opposite the secondary fluid conduit and is configured to alter a velocity of fluid flowing along the primary fluid flow path by extending into a portion of the constricted section along the second axis.

Metering device for introducing a liquid additive into a main liquid flowing along a pipe, includes a pump for withdrawing additive from a container and metering it, this pump including a first inlet for receiving a flow of main liquid which drives the pump, a second inlet for picking up additive and an outlet for the resulting mixture; a Venturi installed in the pipe, and connected in parallel with the pump, the first pump inlet connected by a first line to the Venturi inlet while the outlet connected by a second line to the Venturi throat; a first element for varying the restriction at the Venturi neck, and a second element sensitive to the pressure drop across the pump for controlling the first element to reduce the bore section when the pressure drop across the pump increases, and increase the bore section when the pressure drop across the pump decreases.

A fluid injection device includes a housing and a valve stem. The housing includes an inlet arm having an inlet orifice for receiving a feeder fluid. An outlet arm has an outlet orifice to discharge a mixed fluid. A venturi tube is between the inlet and outlet arms. The inlet arm, veturi tube and outlet arm define a nonlinear fluid pathway where the venturi tube redefines a portion of the nonlinear fluid pathway as a constricted fluid pathway. A diverter port is used to divert a portion of the feeder fluid from the inlet arm into the container and an injection port is used to receive product from the container. A valve arm is collinearly aligned with the venturi tube and the valve stem is positioned within the valve arm and adjusts the volume of the constricted fluid pathway.

A foam generating device for a high-pressure water gun has a supporting body defining part of a conduit, which extends along an axis and has a mixing chamber communicating with a lower inlet, and subject, in use, to a vacuum to aspirate a liquid from said lower inlet; the device has a first sleeve which is fitted around one end of the supporting body, is axially fixed, is rotatable and is provided with an end portion carrying a nozzle; such a nozzle defines the outlet of the conduit and is adjustable so as to vary the outgoing flow type between a fan-like jet and a solid stream jet; the device has, in addition, a second sleeve which is coupled to the first sleeve in a fixed axial position and in a rotatable manner and is provided with cams to adjust the nozzle in response to a rotation of the second sleeve with respect to the first sleeve.

A dispenser for mixing and dispensing a liquid chemical concentrate with a dilutent from a container. The dispenser includes two slideable eductors one of which is also rotatable. Both a high and low flow rate can be obtained with simultaneous adjustment of concentration of the chemical concentrate. The dispenser has a high degree of accuracy of the amount of dilution of the chemical concentrate as well as positive positioning of the high and low flow rate.

The exhaust gas stirring device comprises a cylindrical frame on an inner surface of a flow path member forming an exhaust flow path; supporting parts arranged to radially reach across the frame; a shielding part shielding a central axis of the frame and its circumference in the axis direction of the frame. One of the supporting parts comprises a pair of first skeletons extending radially outwardly from the central axis of the frame. The frame and the supporting parts are configured by assembling assembling members. One of the assembling members comprises the pair of first skeletons, and second skeletons respectively extending in an arc shape from one end of each of the first skeletons and constituting a part of the frame. Each of the first skeletons and the second skeletons in the assembling members comprises a vane part formed to protrude respectively from each of the first and second skeletons.

A mixing manifold is provided. The manifold includes: a body; a first converging passageway in the body; a first diverging passageway in the body in-line and in fluid communication with the first converging passageway to form a first venturi; a first obstruction in a throat of the first venturi configured to move between two positions, a blocking position that blocks, at least in part, flow through the first venturi and an open position; a second converging passageway in the body; a second diverging passageway in the body in-line and in fluid communication with the second converging passageway to form a second venturi; and a second obstruction in the second venturi configured to move between two positions, a blocking position that blocks, at least in part, flow through the second venturi and an open position. A method of providing fluid flow through a manifold is also provided.

A humidification assembly includes a housing that has a first end, a second end and a peripheral wall extending therebetween. The first end and the second end are open. The housing is substantially hollow. The peripheral wall is curvilinear such that the housing has a cylindrical shape. The first end may insertably receive a hair dryer. A gasket is coupled to an inside surface of the peripheral wall. The gasket may frictionally engage the hair dryer air outlet to retain the housing on the hair dryer. A reservoir is provided to contain a fluid. The peripheral wall has a fill aperture extending into the reservoir. The fill aperture directs the fluid into the reservoir. A closure removably closes the fill aperture. A valve is movably coupled between the housing and the venturi. The valve selectively releases the fluid into the venturi to humidify the air urged by the hair dryer.

A dispenser for mixing and dispensing a liquid chemical concentrate with a dilutent from a container. The dispenser includes two slideable eductors one of which is also rotatable. Both a high and low flow rate can be obtained with simultaneous adjustment of concentration of the chemical concentrate. The dispenser has a high degree of accuracy of the amount of dilution of the chemical concentrate as well as positive positioning of the high and low flow rate.