Abstract: A multi-stage ejector for generating a vacuum from a source of compressed air or fluid by passing the compressed air or fluid through a series of nozzles, accelerating and entraining the compressed air or fluid so as to form a jet flow in one or more stages and generate a vacuum across each stage. The multi-stage ejector may include a first drive stage; a second stage; and a converging-diverging nozzle provided in the series of nozzles between the first drive stage and the second stage. The multi-stage ejector, in use, may receive jet flow from the first drive stage, accelerate the jet flow to form a second stage air jet and direct the second stage air jet into an inlet of an outlet nozzle of the second stage. The converging-diverging nozzle may be formed in a molded nozzle piece mounted in the multi-stage ejector.

Abstract: A multistage ejector is provided for generating a vacuum from a source of compressed air. The compressed air is passed through a series of nozzles, which entrains air so as to form a jet flow in two or more stages and generating a vacuum across each stage. The ejector outlet is formed as a nozzle extending to the outlet end of the ejector and arranged to receive the jet flow from the final stage of the ejector. The ejector outlet nozzle includes a diverging section extending at an angle of divergence to the direction of airflow, the diverging section terminating in a stepwise expansion in the cross-sectional flow area, as viewed in a direction perpendicular to the direction of airflow through the ejector outlet nozzle.

Abstract: The invention provides an ejector for generating a vacuum, a drive nozzle for generating a drive jet of air from a compressed air source and directing the drive jet of air into an outlet flow passage at the outlet of a drive stage of the ejector to entrain air in a volume surrounding the jet of air into the jet flow to generate a vacuum across the drive stage. The drive nozzle substantially consists of an inlet flow section and an outlet flow section aligned in a direction of air flow through the nozzle. The outlet flow section diverging in the direction of airflow, from an outlet end of the inlet flow section to an exit of the nozzle, the outlet flow section having a shape which is more divergent near the outlet of the inlet flow section and less divergent near the exit of the nozzle.

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: The present invention relates to handling devices for handling foodstuffs, which may include a suction cup and a docking piece supporting the suction cup. The suction cup may be removably attached to the docking piece. The docking piece may include a drive nozzle inserted into the suction cup, and attached to the docking piece, for ejecting a fluid from the drive nozzle inside of the suction cup. The suction cup may include a drive opening for receiving the drive nozzle of the docking piece, and an outlet nozzle having at least one constriction. The outlet nozzle is aligned with the drive nozzle so that the drive nozzle and the outlet nozzle cooperate to form an ejector. The ejector then applies a suction force to the surface of the foodstuff which is to be handled.

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 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: An ejector system includes a primary ejector in a drive stage and a booster ejector connected in parallel with the primary ejector for simultaneously generating a vacuum across a booster stage. The booster ejector may be configured to generate a vacuum to a lower pressure in the booster stage than in the primary ejector in the drive stage. The booster stage and the drive stage may be connected to a common volume to be evacuated and a valve may be provided to close the connection between the drive stage and the volume to be evacuated when the pressure in the volume to be evacuated falls below the minimum pressure that can be generated in the drive stage.

Abstract: The present invention relates to a handling device (100) for handling foodstuff, comprising a suction cup (10) and a docking piece (30) supporting the suction cup, wherein the suction cup (10) is removably attached to the docking piece (30), wherein the docking piece (30) comprises a drive nozzle (32) inserted into the suction cup (10) attached to the docking piece (30) for ejecting a fluid from the drive nozzle (32) inside of the suction cup (10), and wherein the suction cup (10) comprises a drive opening (14) for receiving the drive nozzle (32) of the docking piece (30), an outlet nozzle (16) having at least one constriction which outlet nozzle (16) is aligned with the drive nozzle (32), so that the drive nozzle (32) and the outlet nozzle (16) cooperate to form an ejector, and a suction opening (12) for applying a suction force provided by the ejector to a surface of the foodstuff to be handled.

Abstract: An ejector for generating a vacuum comprising a first stage. The first stage comprises a drive nozzle and a ring drive nozzle. The drive nozzle is for generating a drive jet of air from a flow of compressed air and directing the drive jet of air into a first stage expansion nozzle in order to entrain air in a volume surrounding the drive jet of air into the jet flow to generate a vacuum across the first stage. The ring drive nozzle is for generating a drive ring of air from the flow of compressed air and directing the drive ring of air onto the jet flow and the entrained air, and into an inlet of an exit expansion nozzle.

Abstract: A pneumatic transport device (1a, 1b) for transporting a pneumatically transportable material (M) in a pneumatic system (10) by means of air for transporting the pneumatic transportable material (M) between a first pneumatic system portion (11) and a second pneumatic system portion (12), the pneumatic system portions (11, 12) including a plurality of pneumatic tubes (13) forming a continuous pneumatic transport path (CL), the device (1a, 1b) including an air source (2a, 2b), typically a vacuum source (2a), pneumatically connected to one of the first or second pneumatic system portions (11, 12) operative to provide air pressure or vacuum through the continuous pneumatic transport path (CL), and a controller (4a, 4b) configured to control the speed of the vacuum source (2a) and/or a mass-flow, respectively, of the material (M) in dependence of input from a monitoring line (3) adapted to monitor the pneumatic transport path (CL) to provide essentially constant speed of transport the pneumatically transportable m

Abstract: A pneumatic transport device (1a, 1b) for transporting a pneumatic transportable material (M) in a pneumatic system (10) by means of air for transporting the pneumatic transportable material (M) between a first pneumatic system portion (11) and a second pneumatic system portion (12), said pneumatic system portions (11, 12) comprising a plurality of pneumatic tubes (13) forming a continuous pneumatic transport path (CL), said device (1a, 1b) comprising: an air source (2a, 2b), typically a vacuum source (2a) pneumatically connected to one of said first or said second pneumatic system portions (11, 12) operative to provide air pressure or vacuum through said continuous pneumatic transport path (CL), wherein a controller (4a, 4b) is configured to control the speed of the vacuum source (2a) and/or a mass-flow, respectively, of the material (M) in dependence of input from a monitoring line (3) adapted to monitor the pneumatic transport path (CL) to provide essentially constant speed of transport the pneumatic tr

Abstract: So as to more rapidly accelerate the air flow in a vacuum ejector to supersonic speed whilst focussing the exiting flow of air to downstream of the exit of the nozzle, the invention provides an ejector for generating a vacuum comprising, a drive nozzle for generating a drive jet of air from a compressed air source and directing said drive jet of air into an outlet flow passage at the outlet of a drive stage of the ejector in order to entrain air in a volume surrounding said jet of air into the jet flow to generate a vacuum across said drive stage, wherein said drive nozzle substantially consists of an inlet flow section and an outlet flow section aligned in a direction of air flow through the nozzle, the outlet flow section diverging in the direction of airflow, from an outlet end of the inlet flow section substantially to an exit of the nozzle, the outlet flow section having a shape which is more divergent near the outlet of the inlet flow section and less divergent near the exit of the nozzle.

Abstract: So as to reduce its size, the invention provides a multistage ejector for generating a vacuum across a first, drive stage comprising a drive nozzle array for generating drive flow of air from a compressed air source, the drive nozzle array including two or more nozzles arranged to feed respective air jets together substantially directly into a common outlet of the drive stage so as to entrain air in a volume surrounding the air jets into the drive flow in order to generate a vacuum across the drive stage, the outlet of the drive stage being the inlet of a converging-diverging nozzle of a second stage, the converging-diverging nozzle being arranged to direct said air as a second stage air jet substantially directly into an outlet of the second stage so as to entrain air in a volume surrounding the second stage air jet into the flow in order to generate a vacuum across the second stage.

Abstract: So as to offer greater design freedom for the upstream nozzles since the resistance upon exit of the jet flow into ambient pressure is encountered less abruptly, the invention provides al.

Abstract: So as to offer the choice of generating a higher vacuum at quicker response times and less space requirements in a more versatile manner, the invention provides an ejector system comprising: a primary ejector in a drive stage and a booster ejector connected in parallel with said primary ejector for simultaneously generating a vacuum across a booster stage, said booster ejector being configured to generate a vacuum to a lower pressure in said booster stage than is said primary ejector in said drive stage, said booster stage and said drive stage being connected to a common volume to be evacuated and a valve being provided to close the connection between the drive stage and the volume to be evacuated when the pressure in the volume to be evacuated falls below the minimum pressure that can be generated in the drive stage.

Abstract: So as to render the manufacturing of an at least equally efficient multi-stage ejector more cost-efficient, the invention provides a multi-stage ejector for generating a vacuum from a source of compressed air by passing said compressed air through a series of nozzles, accelerating said compressed air, and entraining air so as to form a jet flow in one or more stages and generate a vacuum across each stage, the multi-stage ejector comprising a drive stage; a second stage; and a converging-diverging nozzle provided in said series of nozzles between said drive stage and said second stage for receiving jet flow from said drive stage and accelerating said jet flow to form a second stage air jet and directing said second stage air jet into an inlet of an outlet nozzle of the second stage, wherein said converging-diverging nozzle is formed in a moulded nozzle piece mounted in said multi-stage ejector.

Abstract: A bellows insert (25) is shown, mountable inside a bellows for a vacuum powered tool and, in the mounted position, effective to locally limit the capacity of the bellows of compression in its longitudinal direction caused by a negative pressure introduced into the bellows. The bellows insert includes an engagement part (26) that has a shape complementary to the inside of the bellows and that, in the mounted position of the bellows insert, fills up some or all of the pleats of the bellows, within a limited area of the circumference of the bellows.

Abstract: A bellows insert (25) is shown, mountable inside a bellows for a vacuum powered tool and, in the mounted position, effective to locally limit the capacity of the bellows of compression in its longitudinal direction caused by a negative pressure introduced into the bellows. The bellows insert includes an engagement part (26) that has a shape complementary to the inside of the bellows and that, in the mounted position of the bellows insert, fills up some or all of the pleats of the bellows, within a limited area of the circumference of the bellows.

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: 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.