An ejector includes a nozzle, a suction chamber, and a diffuser. An outlet flow path includes a narrowed flow path having a first tapered surface narrowed toward downstream, a parallel flow path having a constant sectional area, and a parallel flow path having a second tapered surface expanded toward downstream. The diffuser further includes an attachment configured to change the dimensions of the outlet flow path. The attachment changes the dimensions of the outlet flow path such that the ratio of the tapered angle of the first tapered surface to the tapered angle of the second tapered surface is higher as the sectional area, i.e., the inner diameter, of the parallel flow path is smaller.

An ejector includes a nozzle, a suction chamber, and a diffuser. A diffuser further includes an attachment configured to change the dimensions of the outlet flow path. The attachment changes the length X of a narrowed flow path and the length Y and the inner diameter D of a parallel flow path such that expressions (1) and (2) are satisfied:

X=AD(1),

and

Y=BD(2).

An ejector includes a nozzle, a swirl flow generation portion, a body including a refrigerant suction port and a diffuser portion, a passage forming member, and an actuation device moving the passage forming member. A nozzle passage is defined between the nozzle and the passage forming member. A smallest passage cross-sectional area portion is provided in the nozzle passage. A swirl space that has a shape of a revolution and is coaxial with the nozzle, and a refrigerant inflow passage through which the refrigerant flows into the swirl space are defined in the swirl flow generation portion. The ejector further includes an area adjustment device that changes the passage cross-sectional area of the refrigerant inflow passage. According to this, an efficiency of energy conversion in the nozzle passage can be improved.

A nozzle for a fan assembly is described. The nozzle includes a first duct through which a first airflow moves, the first duct having a first outlet for emitting the first airflow. The nozzle further includes a second duct through which a second airflow moves, the second duct having a second outlet for emitting the second airflow. The first and second outlets are arranged such that the first and second airflows collide to generate a combined airflow having a direction defined by the relative flow rates of the first and second airflows. The first duct then includes a portion moveable to vary the flow rate of the first airflow.

A fan assembly includes a nozzle and a device for creating an air flow through the nozzle. The nozzle includes an interior passage, a mouth for receiving the air flow from the interior passage, and a Coanda surface located adjacent the mouth and over which the mouth is arranged to direct the air flow. The mouth and the Coanda surface extend about an axis. The Coanda surface comprises a diffuser portion, the angle subtended between the axis and the diffuser portion of the Coanda surface varying about the axis.

The invention relates to an injection module (2) for a conveyor assembly (1) of a fuel cell system (31) for conveying and/or recirculating a gaseous medium, in particular hydrogen, in which: the injection module (2) has a communicating opening (29) and/or an inlet opening (3), by means of which the gaseous medium flows into the injection module (2); the injection module (2) has a small nozzle body (13) having a first drive nozzle (12) and a large nozzle body (15) having a second drive nozzle (14), by means of which (12, 14) the gaseous medium flows out of the injection module (2); the small nozzle body (13) is disposed movably in the direction of a longitudinal axis (52) in the large nozzle body (8) and/or in the injection module (2); the small nozzle body (13) and the large nozzle body (15) each have a gas flow path (III, IV); the gaseous medium can flow either only through the first gas flow path III or through the first gas flow path III and the second gas flow path IV simultaneously; the second gas flow path IV can be opened or closed by means of a movement of the small nozzle body (13). According to the invention, the small nozzle body (13) abuts a stop disc (30) and/or at least indirectly abuts the large nozzle body (15), and thus forms an opening pressure surface (22); the opening pressure surface (22) and a closing pressure surface (24), in particular located at the outflow end of the small nozzle body, are at least almost the same size; the opening pressure surface (22) can be subjected to a dynamic pressure (44) at the inflow end.

An ejector includes a body part having a depressurizing space in which a refrigerant flowing out of a swirling space is depressurized, a suction passage that draws a refrigerant from an external, and a pressurizing space in which the refrigerant from the depressurizing space is mixed with the refrigerant from the suction passage, a conical passage formation member that is arranged in the body part, and a driving device that displaces a nozzle body of the body part forming the depressurizing space. A nozzle passage is defined on an outer peripheral side of the passage formation member in the depressurizing space, a diffuser passage is formed on an outer peripheral side of the passage formation member in the pressurizing space, and an actuating bar that couples the driving device with the nozzle body is arranged without crossing the diffuser passage.

A variable volume induction nozzle is designed for use with a variable speed fan, where fan speed is adjusted in response to variable exhaust gas flow volume in order to conserve energy. In order to maintain a minimum exhaust discharge velocity to ensure adequate plume height, an axially-extendable, upwardly tapered flow-impinging pod within the nozzle creates a variable annular nozzle outlet opening. As opposed to a circumferentially-constricted outlet opening, the variable annular outlet produces a uniform discharge velocity profile conducive to the induction of ambient air through a windband.

An aspirator may comprise an aspirator body defining an air channel. An aspirator barrel may have a first aspirator barrel segment coupled to the aspirator body and may have a second aspirator barrel segment. The second aspirator barrel segment configured to fit at least partially within the first aspirator barrel segment when the aspirator barrel is in a stowed state and configured to interlock with the first aspirator barrel segment in an extended position when the aspirator barrel is in a deployed state.

The invention relates to an adjustable steam injector of the type which has an injector housing with an inlet for a product which is to be heated and an inlet for steam. The injector housing also has an outlet for the product mixed with steam. The injector also includes an injector body displaceable in the injector housing. About the front end of the injector body there are disposed concentric gaps for product and steam, respectively. The injector body has a recess in its front end. The recess has the same extent as the cross sectional surface of the injector body and has its greatest depth in the center of the injector body.