A blower is disclosed. The blower of the present disclosure comprises: a fan for producing air flow; a lower body providing an inner space in which the fan is installed, and having an intake hole through which air passes; an upper body placed on the lower body to form a flow passage which communicates with the inner space of the lower body, and having a space which is formed to pass through the upper body in the forward and backward direction, wherein the upper body includes a slit which is formed through the upper body and through which air flowing through the flow passage of the upper body is discharged to the space, and the slit comprises: a rear slit adjacent to the rear end of the upper body; and a front slit adjacent to the front end of the upper body.

An ejector and a refrigeration cycle apparatus having an ejector are provided. The ejector may include an ejector body having an accommodation space therein, a suction portion through which a high pressure refrigerant and a low pressure refrigerant may be suctioned into the accommodation space, and a mixing portion configured to mix the high pressure refrigerant with the low pressure refrigerant; a nozzle provided in the ejector body, having a nozzle neck and an expansion portion, and configured to inject the high pressure refrigerant into the mixing portion; a first needle moveably provided at the expansion portion, and configured to control a flow sectional area of the expansion portion; a second needle moveably provided at the nozzle neck, and configured to control a flow sectional area of the nozzle neck; a first needle drive configured to drive the first needle; and a second needle drive configured to drive the second needle. With such a configuration, the flow sectional area of the nozzle neck and the flow sectional area of the expansion portion may be independently controlled in correspondence to a drive condition.

An aspirator system for inflating an inflatable device includes an aspirator body and a plurality of nozzles. The aspirator body has an inner surface and an outer surface that each extend between a first end and a second end along a central longitudinal axis. The aspirator body defines a distribution channel that is disposed between the inner surface and the outer surface. The plurality of nozzles are fluidly connected to the distribution channel and extend inwardly from the inner surface towards but are spaced apart from the central longitudinal axis.

A jet pump (10) comprising a tubular body (12), a first injection duct (14) which opens into the body (12) via a first outlet nozzle (18), a second injection duct (16) which opens into the body (12) via a second outlet nozzle (20) which surrounds the first outlet nozzle (18), the downstream end (20a) of the second outlet nozzle (20) being situated axially level with the downstream end (18a) of the first outlet nozzle (18), wherein the upstream end (18b) of the first nozzle (18) comprises an axial orifice (30) centered on the main axis of the body (12), and in that the jet pump (10) is configured for either plugging or not plugging the axial orifice (30) of the first outlet nozzle (18).

A hydraulically-retrievable, reversible flow operation jet pump threadably attached to a tubing string which is powered by fluid supplied through the tubing string. A pump housing, or container, of the jet pump includes a hollow cylinder with an internal diameter closely matching that of the attached tubing string. A jet pump assembly is retainably, scalably disposed within the pump housing. A jet pump reducing nozzle-mixing chamber-diffuser assembly is retainably disposed within the carrier. Power fluid pumped through the nozzle-mixing chamber-diffuser assembly conventionally draws in objective fluid in which the jet pump is immersed, and transports it out of the pump to the desired receiving station. The jet pump assembly can be oriented in either of two directions within the pump housing, for selected fluid direction flow.

Disclosed is a device (1) for recirculating anode gas in an anode circuit (11) of a fuel cell system (10), comprising at least one jet pump (2) with a propelling nozzle (3) for introducing fresh anode gas, preferably hydrogen, an inlet (4) for recirculated anode gas, and an outlet (5) for fresh and recirculated anode gas; an actively controllable valve (6) for closing and opening the inlet (4) is arranged in the area of the inlet (4), said valve comprising a magnet assembly (7) for acting on a reciprocating armature (8), and a valve spring (9).

Also disclosed is a fuel cell system (10) comprising a device (1) of said kind.

An aspirator system includes an aspirator body having a longitudinal axis. A channel configured for telescoping expansion and contraction along the longitudinal axis includes a first tapered tube section with a proximal end secured to an outflow region of the aspirator body. A second tapered tube section is disposed in telescoping engagement with the first tapered tube section. A drag assembly is secured to a distal end of the second tapered tube section.

An aspirator for creating vacuum is disclosed that includes a housing defining a fluid passageway with a first tapering portion and a second tapering portion. Each tapering portion has a larger internal opening and a smaller internal opening, the smaller openings facing one another. The aspirator includes a gate positioned between and in fluid communication with the first and second tapering portions, the gate having a first Venturi tube with a Venturi opening creating vacuum when fluid flows in a direction and a second Venturi tube with a Venturi opening that creates vacuum when fluid flows in the opposite direction. The Venturi openings are in fluid communication with a suction port, and the first and second Venturi tubes may provide different mass flow rates through the aspirator. An engine system having an aspirator with a gate having a first bore and a second bore and an actuator is also disclosed.

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.

An ejector includes a body including an inflow space into which a refrigerant flows, a passage formation member disposed inside the body and having a conical shape, and a nozzle passage having an annular cross section which functions as a nozzle and a diffuser passage having an annular cross section which functions as a pressure increase portion, the nozzle passage and the diffuser passage being disposed between an inner wall surface of the body and a conical lateral surface of the passage formation member. A drive mechanism that displaces the passage formation member in a direction along a center axis is coupled to an upstream actuating bar which extends from the passage formation member toward the inflow space and is slidably supported by the body. Center axes of the passage formation member, the upstream actuating bar and the inflow space are coaxial with each other.