A fuel system includes a fuel reservoir configured to be located within the fuel tank such that the fuel reservoir defines a fuel reservoir volume which is a subset of a fuel tank volume; a fuel pump configured to pump fuel from within the fuel reservoir volume to the fuel consuming device through a fuel supply line; a jet pump configured to 1) receive excess fuel, through a fuel return line, which had been supplied to the fuel consuming device through the fuel supply line and 2) aspirate fuel into the fuel reservoir volume from the fuel tank volume; and a valve which allows fuel flow in both directions between the fuel return line and the jet pump when a differential pressure across the valve is greater than or equal to a predetermined threshold.

A fuel system includes a fuel reservoir configured to be located within the fuel tank such that the fuel reservoir defines a fuel reservoir volume which is a subset of a fuel tank volume; a fuel pump configured to pump fuel from within the fuel reservoir volume to the fuel consuming device through a fuel supply line; a jet pump configured to 1) receive excess fuel, through a fuel return line, which had been supplied to the fuel consuming device through the fuel supply line and 2) aspirate fuel into the fuel reservoir volume from the fuel tank volume; and a valve which allows fuel flow in both directions between the fuel return line and the jet pump when a differential pressure across the valve is greater than or equal to a predetermined threshold.

An example injector includes a first conduit defining a first flow path including a first choke for a first fluid and a second conduit defining a second flow path including a second choke for a second fluid. The second choke is defined by a converging region upstream and a diverging region downstream of the second choke. The example injector further includes a mixing region after both the diverging region of the second flow path and the first choke and configured to receive the first fluid the second fluid, and an outlet configured to allow the first fluid and the second fluid to exit the mixing region. The first and second chokes are configured to allow a constant mass flow of the first and second fluids, respectively, to flow into the mixing region independent of a pressure at the outlet.

A method for the production of a suction jet pump delivering fuel into or out of a fuel tank, wherein the suction jet pump has a flow channel and a nozzle, and wherein the flow channel forms a feed line to the nozzle and the flow channel is formed in one piece with the nozzle, the method including, in the following order: placing a mold core into a matrix to produce the suction jet pump by injection molding and form a cavity between the mold core and the matrix; encapsulating the mold core and filling the cavity formed between mold core and matrix with a plastic; removing the mold core through an installation opening, arranged opposite the nozzle, in the flow channel; and closing the installation opening by thermal deformation, in the edge region of the installation opening, of the plastic used for the production of the suction jet pump.

A method for the production of a suction jet pump delivering fuel into or out of a fuel tank, wherein the suction jet pump has a flow channel and a nozzle, and wherein the flow channel forms a feed line to the nozzle and the flow channel is formed in one piece with the nozzle, the method including, in the following order: placing a mold core into a matrix to produce the suction jet pump by injection molding and form a cavity between the mold core and the matrix; encapsulating the mold core and filling the cavity formed between mold core and matrix with a plastic; removing the mold core through an installation opening, arranged opposite the nozzle, in the flow channel; and closing the installation opening by thermal deformation, in the edge region of the installation opening, of the plastic used for the production of the suction jet pump.

In a vacuum ejector provided with a seal valve mechanism between a vacuum generation mechanism and a break flow path, the seal valve mechanism includes a valve plug that is biased toward a sealing opening from the break flow path side to block the seal opening, and is configured to open the seal opening by moving the valve plug away from the seal opening using a piston portion that operates according to supply air supplied from the vacuum generation mechanism.

A fuel system includes a fuel reservoir configured to be located within the fuel tank such that the fuel reservoir defines a fuel reservoir volume which is a subset of a fuel tank volume; a fuel pump configured to pump fuel from within the fuel reservoir volume to the fuel consuming device through a fuel supply line; a jet pump configured to 1) receive excess fuel, through a fuel return line, which had been supplied to the fuel consuming device through the fuel supply line and 2) aspirate fuel into the fuel reservoir volume from the fuel tank volume; and a valve which allows fuel flow in both directions between the fuel return line and the jet pump when a differential pressure across the valve is greater than or equal to a predetermined threshold.

An air outlet cylinder of a bladeless fan is provided, having an air cylinder and a nozzle; the air cylinder is provided with an air inlet for receiving airflows, and an internal channel; the front-end sidewall of the air cylinder is provided with an opening extending longitudinally therethrough; the inner wall surface at each of two sides of the opening in the air cylinder is separately provided with a limiting groove extending longitudinally therethrough; the nozzle has a mouth part embedded in the opening and two airflow guiding parts respectively embedded in the corresponding limiting grooves; multiple air outlet slits are longitudinally spaced on the mouth part; airflows received in the internal channel are sprayed from the air outlet slits. A bladeless fan having the air outlet cylinder is also provided.

An aspirator air vent valve may include an air vent valve body coupled with an aspirator body and a pipe fitting. The air vent valve body may include an air vent valve air channel defined by an inner wall of the air vent valve body and disposed between the aspirator body and the pipe fitting. The aspirator air vent valve may further include a vent passage defined by a first vent wall and a second vent wall and disposed between an outer wall and the inner wall of the air vent valve body, wherein the vent passage is in fluid communication with the air vent valve air channel. The aspirator air vent valve may further include a plunger coupled with the air vent valve body.

Disclosed is a compact vacuum pump including a housing having an internal vacuum chamber, an ejector pump axially mounted in the vacuum chamber, and an air filter coaxially mounted on the ejector pump. The housing has two separate compressed air supply lines one of which is a vacuum creation line extending to the inlet port of the ejector pump via a first supply line and the other of which is a vacuum release line extending to a gap between the ejector pump and the air filter via a second supply line. The vacuum pump is of a coaxial arrangement type and has a vacuum release function and a filter cleaning function.