Abstract: A vacuum ejector device (2) for generating at least partial vacuum to be supplied to a gripping member (4), comprising a device body (6) having an elongated shape along a longitudinal axis A. A movable sealing and venting element (24) is provided and is structured to selectively substantially close and seal, in a sealing position, a vacuum duct (16) when the air supply is activated, and to open or vent said vacuum duct to release or vent via a venting duct (26), in a venting position, the vacuum within the gripping member (4) when the vacuum source or air supply is deactivated. The sealing and venting element (24) is arranged essentially at the longitudinal axis A, and that the venting duct (26) is arranged and provides for fluid communication between the sealing and venting element (24) and a venting outlet port (28) provided at a long side of said elongated device body (6).

Abstract: A pneumatic transport system (10), comprising at least one material transport carrier for transporting a pneumatic transportable material (M) in the pneumatic system (10) by means of a pneumatic device (1a) adapted to operate with negative pressure on the material transport carrier to transport the pneumatic transportable material (M) in the pneumatic system (10) comprising one or more tubes (13) forming a continuous transport path (CL), wherein a pressure-drop monitoring element (3a) is provided and adapted to monitor filter performance of a separating filter (16) provided in the transport path (CL) and adapted to separate the material transport carrier and the transportable material (M) in the transport path (CL).

Abstract: According to the invention, a vacuum pump is disclosed comprising a screw-rotor pump having a compression section (8) and an expansion section (7), and wherein a discharge (10) from the compression section communicates with at least one ejector (1) for discharge of compressed gas through the ejector, and wherein the expansion section (7) is connectable via a first valve means (5), to a drive-gas source (P) for operating the screw,-rotor pump and the ejector in parallel. Also, a method for providing sub-pressure to an industrial process is disclosed wherein at least one ejector (1) is used initially to reduce the pressure to a predetermined lower level, from where the pressure is further reduced by means of a screw-rotor pump (7, 8) that is arranged to operate through, and in parallel with the ejector.

Abstract: A vacuum operated lifting apparatus includes a piston having a pressure side and a suction side, respectively, and being movably received in a cylinder, wherein a piston shaft projects through a bottom of the cylinder from the pressure side of the piston and having a through passage for connecting the piston pressure side with the atmosphere. An axially compressible space is connected to a vacuum source for evacuation of the chamber and sealed in air-tight attachment to the piston suction side, the space being confined within the wall of a flexible bellows.

Abstract: Ejector type vacuum pump, comprising a rotationally symmetric ejector body (4) arranged in a house to be contained in a vacuum chamber (3) that extends axially and opens through a wall of the house, a dust filter (15) running concentrically about the eject body comprising a tube shaped, porous filter body, a frame circumferentially enclosing the filter body so that the filter body and frame form a self containing unit that extends substantially about the whole length of the ejector body to be axially fixed by a muffler (11) that is received in the opening of the vacuum chamber.

Abstract: An assembly for generating a negative pressure in an industrial process includes a plurality of interconnected units formed with wedge-shaped connections in their mutually contacting surfaces. Intermediate units in the assembly, such as an ejector housing, are formed in each contact surface thereof with the same type of connections. Accordingly, one end of the unit includes a female connection on one side thereof, and a male connection on the opposite side, whereas the other end of the unit includes a male connection on the first side and a female connection on the opposite side. The connections include inclined slide surfaces, providing a hook mount which presses the units together in a wedging effect as the units are axially displaced relative to each other. The displacement is produced by a bolt acting between the units.

Abstract: An ejector includes two or more nozzles arranged in series. A stream of air fed at high velocity through the nozzle is used to create a negative pressure in an outer, surrounding space. The surrounding space is in flow communication with at least one slot located between the nozzles. The nozzles are coupled together and assembled into an integrated nozzle body having at least one flexible valve member integrally arranged within the nozzle body to cover the flow communication with the surrounding space upon reaching a certain, desired pressure difference between the surrounding space and the atmosphere.

Abstract: Method of achieving with at least two compressed air operated ejectors a desired subpressure in the shortest possible time and with the least use of energy, this method including connection of the ejectors such that they work one at a time in response to which of them is supplied with compressed air. In turn, compressed air supply is controlled in respons to the subpressure in a subpressure collection chamber common for all ejectors. An ejector array (1) for the method includes at least two compressed air operated ejectors (2, 3) each having its own optimum efficiency at the same values of the supplied compressed air. A sensor is disposed for sensing the subpressure in the chamber (23), compressed air being supplied to one ejector (2, 3) at a time, in response to the sensed pressure in the chamber (23). Compressed air is first supplied to the ejector (2) evacuating the greatest amount of air per time unit, and last to the ejector (3) generating the lowest subpressure.