Abstract: A suction cup for a tool driven by vacuum is presented, the suction cup in a first or upper end arranged to be brought into fluid flow communication with a vacuum source and in its opposite end arranged to be brought tightly into contact with the surface of an object to be handled. The suction cup is in its lower end arranged to be coupled to a sealing ring having a sealing surface arranged between an outer periphery and a through-opening defined by an inner periphery, and the sealing ring in the region of its inner periphery having a lip arranged to engage with the suction cup, to which purpose the suction cup in its lower end has a circumferentially running groove) in which the peripheral region and the lip of the sealing ring is insertable under form fitting engagement and in a radially overlapping relation between the groove and the lip in the region (r) of engagement.

Abstract: An ejector device effective to generate a negative pressure by element of compressed air fed to an ejector of the device via a compressed-air duct includes an air suction duct, a pressure sensor and an electrically activatable valve member arranged in the compressed-air duct for regulating the flow of compressed air to the ejector, as well as electrically supplied control electronics (6) adapted to actuate the valve member in response to the pressure in the air suction duct detected by the sensor. The device includes an accumulator by which the control electronics are supplied with electricity, and a generator, which via a charging air duct (9), is in flow communication with the compressed-air duct and is driven by compressed air for generating electrical energy, which is brought into the accumulator for charging the same.

Abstract: A suction cup for a tool driven by vacuum is presented, the suction cup in a first or upper end arranged to be brought into fluid flow communication with a vacuum source and in its opposite end arranged to be brought tightly into contact with the surface of an object to be handled. The suction cup is in its lower end arranged to be coupled to a sealing ring having a sealing surface arranged between an outer periphery and a through-opening defined by an inner periphery, and the sealing ring in the region of its inner periphery having a lip arranged to engage with the suction cup, to which purpose the suction cup in its lower end has a circumferentially running groove) in which the peripheral region and the lip of the sealing ring is insertable under form fitting engagement and in a radially overlapping relation between the groove and the lip in the region (r) of engagement.

Abstract: A vacuum generator driven by compressed air and arranged to supply vacuum to a vacuum gripper element, wherein a chamber (6) is associated with the vacuum generator and arranged to be brought in flow connection (9) with the vacuum gripper element via a valve (15) which is actuated by overpressure accumulated in the chamber to open the connection (9) to the vacuum gripper element in order to discharge the overpressure to the vacuum gripper element in result of interruption of the compressed air flow (P). The vacuum generator is characterized in that the chamber (6) in addition includes a flow connection (11) with the ambient atmosphere, and in the additional flow connection (11) a one-way valve (10) which is arranged to open the connection (11) with the atmosphere in result of the air pressure in the chamber (6) falling below the atmospheric pressure.

Abstract: An ejector device adapted to generate a negative pressure with compressed air, which via a compressed-air duct is fed to an ejector, the device including a valve member arranged in the compressed-air duct and controllable in order to, in the open position, allow flow of compressed air to the ejector, an air suction duct arranged between the ejector and a gripping member driven by negative pressure, and a vent valve fluidly arranged with the air suction duct and that, in an open position, places the gripping member in communication with the atmosphere. The valve member embraces: a primary valve arranged in the direction of flow of compressed air; a secondary valve arranged downstream of the primary valve; a flow section of compressed-air duct between the primary and secondary valve, the vent valve communicating with the flow section so that, in the open position of the primary valve, is continuously being subjected to a closing air pressure, independently of the open or closed position of the secondary valve.

Abstract: An ejector device effective to generate a negative pressure by element of compressed air fed to an ejector of the device via a compressed-air duct includes an air suction duct, a pressure sensor and an electrically activatable valve member arranged in the compressed-air duct for regulating the flow of compressed air to the ejector, as well as electrically supplied control electronics (6) adapted to actuate the valve member in response to the pressure in the air suction duct detected by the sensor. The device includes an accumulator by which the control electronics are supplied with electricity, and a generator, which via a charging air duct (9), is in flow communication with the compressed-air duct and is driven by compressed air for generating electrical energy, which is brought into the accumulator for charging the same.

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: An ejector which is operative for generating a sub-pressure, has a rotationally symmetric ejector body arranged to be mounted in the mouth of a seat having a circular internal section, whereby in a mounted position an inlet end of the ejector body is inserted in the seat and an outlet end thereof projects outside the mouth of the seat. The ejector body has on its exterior a region of defined axial length with a radius that is growing towards the inlet end, the region being situated between inlet and outlet ends, as well as a shoulder having an abutment surface facing the region, the shoulder being arranged on the ejector body near the outlet end thereof. The ejector is arranged for supporting a cylindrical clamping sleeve for a limited axial displacement about the ejector body, between the shoulder and the region.

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.

Abstract: The present invention relates summarily to a mult-ejector device with at least one ejector part (2) including at least one array of ejector jets (18, 19, 20) placed one after the other in the ejector part (2). Under the action of compressed air flowing through them, the jets (18, 19, 20) generate a subpressure in chambers (11, 12) connected to the jets. The chambers (11, 12) are in communication via openings (13, 15, 17) provided with non-return valves (14, 16) with a vacuum collection chamber (9), to which the tool or the like driven by the ejector device is connected. The ejector part (2) is an element in the shape of a plate formed by moulding or in some other way, where the ejector jets (18, 19, 20) and the valve chambers (11, 12) are formed integrally in the plate-like piece.

Abstract: An ejector device having an adjustment characteristic which is stepless variable in dependence of the negative pressure generated by the ejector device. The ejector device comprises a portion (16) for connection with a source of positive pressure which delivers the work pressure to the ejector device (1) to give rise to the ejector action. A portion (2) includes inlet (18) for the member which is intended to use the negative pressure created by ejector device (1). The two portions (16, 2) of the ejector device (1) are stepless movable in relation to each other, and in the space therebetween is an adjustment plate (13) for controlling the suction action obtained by the ejector device (1). The outlet slit (17) of the ejector device (1) is located between the plate (13) and the portion intended for connection with the positive pressure source. The adjustment plate (13) is connected to a stem (10) which is movable in relation to the portion (2) for connection with the negative pressure member.

Abstract: The present invention relates briefly to an improved multi-ejector having at least one set of ejector nozzles (12, 13, 14, 15) arranged successively for evacuating of successively arranged chambers (5, 6, 7) which chambers are in communication with a vacuum collecting compartment (16) through ports (18, 19, 20) provided with valves. At least one additional set of nozzles (24, 25) evacuates a chamber (4) in direct communication with the vacuum collecting chamber (16) and the outlet therefrom is arranged in connection with the chamber (5) in which the lowest negative pressure is existing when the first mentioned set of ejector nozzles (12, 13, 14, 15) is operating.