An ejector with a suction nozzle is disclosed, with a drive nozzle and with a mixing tube, to which is assigned an adjustment device for the at least region-wise adjustment of a flow cross-section of the mixing tube. Inside the drive nozzle, an axially movable needle which is designed to adjust a flow cross-section of the drive nozzle is arranged and a coupling mechanism is provided which connects the adjustment device to the needle or to an actuator actuating the needle in such a way that the adjustment device adjusts or changes the flow cross-section of the mixing tube as a function of an axial needle movement. A fuel cell system with such an ejector is also disclosed.

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.

A dry roughing vacuum pump includes a valve (10; 15) with a through-passage arranged in the discharge line (9), the valve (10) with a through-passage being able to move between a closed position in which the valve (10; 15) with a through-passage is in contact with a seat of a mouth (12) of the discharge line (9) and an open position in which the valve with a through-passage is moved away from the mouth (12) of the discharge line (9), the vacuum pump including a motor gas injection device (13) that is configured to inject a motor gas into the inlet (11a) of the Venturi-effect passage (11).

When an ejector having a variable nozzle and a variable throttle mechanism are integrated together as an ejector module, a nozzle-side central axis CL1 and a decompression-side driving mechanism have a twisted positional relationship, if the nozzle-side central axis CL1 is defined as a central axis of a nozzle-side driving mechanism in a displacement direction in which the nozzle-side driving mechanism of the ejector having the variable nozzle displaces a needle valve, and the decompression-side central axis CL2 is defined as a central axis of a decompression-side driving mechanism in a displacement direction in which the decompression-side driving mechanism of the variable throttle mechanism displaces a throttle valve. When viewed from the central axis direction of one of the nozzle-side central axis CL1 and the decompression-side central axis CL2, a driving portion corresponding to the one central axis is disposed to overlap with the other central axis.

A blower is disclosed. The blower of the present disclosure comprises: a fan generating flow of air; a lower body providing an internal space in which the fan is installed, and having a suction hole through which air passes; an upper body being an upper body, which is installed over the lower body and forms a channel that communicates with the internal space of the lower body, and having a space formed through the upper body in a front-rear direction; a slit formed to pass through the upper body and discharging air flowing through the channel of the upper body to an outside of the upper body; and a vane or a door movably installed inside the upper body, and adjusting a flow direction of the air passing through the slit.

A conveying unit (1) for a fuel cell system (31) for conveying and/or recirculating a gaseous medium, in particular hydrogen, comprising a jet pump (4) driven by a driving jet of a pressurized gaseous medium, and comprising a metering valve (6) with a nozzle (12), wherein: the conveying unit (1) is designed as a combined valve jet pump assembly (2); the gaseous medium is fed to the jet pump (4) by means of the metering valve (6); the jet pump (4) has a main body (8); and the jet pump (4) is connected to an anode inlet (3) of a fuel cell (29). According to the invention, a deflection and/or change of direction of the gaseous medium which flows in a flow direction VII from the jet pump (4) to the anode input (3) of the fuel cell (29) occurs exclusively in the deflection region (22), said the jet pump (4) having a separate closure cover (5) connected to the main body (8), and the deflection region (22) and/or the deflection- or guiding geometry of the deflection region for the gaseous medium (22) is formed exclusively in the component of the closing cover (5).

The present disclosure provides an ejector nozzle and an ejector including the same. The ejector nozzle includes a first tube having a first flow path into which a fluid is introduced, and a second tube provided outside the first tube and having an inner diameter larger than an inner diameter of the first tube, the second tube defining a second flow path between the first tube and the second tube, in which the first tube further includes a communication port that penetrates the first tube to allow the first flow path to communicate with the second flow path and is openably and closable provided, and in which when the communication port is opened, a part of the fluid flowing in the first flow path is allowed to flow along the second flow path.

An ejector includes a nozzle, a needle and a body. The nozzle reduces a pressure of a fluid and discharges the fluid as an injected fluid from a fluid injection port. The body includes a fluid suction port and a pressure increasing portion. The fluid suction port draws, as a suction fluid, a fluid from an outside of the body by using a suction force generated by the injected fluid. The pressure increasing portion increases a pressure of a mixture of the injected fluid and the suction fluid. The nozzle includes a throat portion and a nozzle-side tapered portion. The throat portion reduces a passage cross-sectional area of the fluid passage to be smallest in the fluid passage at the throat portion. The nozzle-side tapered portion expands the passage cross-sectional area of the fluid passage toward the downstream side in the flow direction of the fluid. In an axial cross section, an injection-flow spread angle formed on the downstream side in the flow direction of the fluid between a central axis and a tangent line of an injection-flow center line at the fluid injection port is 0 or greater.

The present disclosure relates to the technical field of energy and power, in particular to an ejector with a core needle cooled by cooling medium. In the ejector with a core needle cooled by cooling medium, a cooling section is arranged between a stepping motor and a nozzle; the stepping motor, the cooling section and the nozzle are arranged coaxially, a partition plate and a sealing element are used to isolate the cooling medium from the primary flow medium, and the cooling medium is introduced into the cooling section to effectively cool the core needle therein, without affecting the adjustment function of the core needle for an area of the nozzle throat, so as to effectively improve the performance of the ejector. As the core needle is cooled, the adjustable ejector can be used in the primary flow fields with high temperature.

A blocking device for a recirculation loop in a fuel cell stack comprises a hydrogen inlet and a recirculation gas inlet. In order to obtain an inexpensive blocking device for the recirculation loop, a recirculation loop blocking valve is provided, which is switched by an upstream hydrogen switching valve.