The invention relates to a suction/compression assembly for aspirating/compressing gases from/in a system to/from an external environment. The assembly includes an operating machine comprising a body, which defines a chamber, within which one or more rotors are housed, rotating about a corresponding rotation axis. Such a chamber has a symmetrical transverse section evaluated on a plane with respect to at least one first reference plane on which said rotation axis lies. The assembly comprises a device for injecting gas into said chamber which comprises a manifold, connectable to an external source, and a plurality of injection pipes connected to the manifold and to the body of the machine. The body defines a plurality of injection passages, each of which is configured to make one of said injection pipes communicating with the chamber of the machine.

A screw compressor includes an outlet housing. The outlet housing includes a passage that is configured to communicate compressed fluid from a screw rotor to a discharge. A removable cover plate is configured to cover a portion of the passage. A method of varying a volume index for a screw compressor is also disclosed.

A compressor element of a screw compressor inlet side and an outlet side and two helical rotors, respectively a male rotor with a drive for the male rotor and a female rotor that is driven by the male rotor by means of synchronisation gearwheels with at least one synchronisation gearwheel on the male rotor, wherein the drive and synchronisation gearwheels of the male rotor are chosen such that, upon being driven with acceleration of the rotors without gas forces, the resulting mechanical drive force that is exerted by this drive and by this synchronisation gearwheel on the male rotor has an axial component that is directed from the outlet side to the inlet side and that the movement of the male rotor in the axial direction from the outlet side to the inlet side is fixed by means of a single axial single-acting or double-acting bearing.

An element for compression of a gas to be compressed having a low temperature of ?40? C. or lower, which element (1) is provided with a housing (2) containing at least one rotor (3) which is mounted rotatably with its shaft (5) with respect to the housing (2) and with an inlet (6) for the gas to be compressed and an outlet (7) for compressed gas, characterized in that the element (1) is provided with a heating means for an end (9a) of the shaft (5) of the rotor (3) located closest to the inlet (6).

Volumetric compressor (1) for collection and/or treatment equipment of material in liquid, solid, dusty or muddy form. The compressor (1) comprises an operative chamber (50), defining a suction section and an exhaust section of a first fluid, a first header (61) and a second header (62), which delimit said chamber (50) on opposite parts along a longitudinal axis (101). The compressor further comprises at least two rotors (80, 80) with lobes (81, 81) housed in the chamber (50), each rotor (80, 80) rotating about a rotation axis (108, 108) substantially parallel to said longitudinal axis (101). The lobes of each rotor develop according to a helical profile. Furthermore, each of the headers (61, 62) defines at least one injection opening (71, 71, 72, 72) communicating with a feeding device (150) of a second fluid.

A screw compressor comprising a compressor element with a housing in which two helical rotors are mounted on bearings by their shafts, and a gearboxwith a housing with a mounting surface that is built onto a mounting surface of the housing of the compressor element, and which is coupled in a torque-transmitting way to a shaft of at least one of the aforementioned rotors, whereby the compressor element is provided with an oil circuit with an input and an output for oil and a cooling jacket with an input and output for a coolant, wherein the aforementioned inputs and outputs for the oil and for the coolant are located in the aforementioned mounting surface of the housing of the compressor element, whereby these inputs and outputs connect to channels for the respective supply and removal of the oil and the coolant.

The present invention concerns a volumetric compressor (1) that can be used. preferably. for producing equipment and/or a plant for the suction of material in liquid. solid. powder or slurry form. The compressor according to the invention comprises a body (2) defining an operative chamber (5). a suction section (51) and a discharge section (52) of an operating fluid. The compressor further comprises at least two lobe rotors (8A. 8B), the lobes (81A. 81B) of which are housed inside said operative chamber (5), cach rotor (8A. 8B) rotating around a corresponding longitudinal rotation axis (101A. 101B). The compressor comprises a first header (6) and a second header (6) which delimit on opposite sides the operative chamber (5): cach header comprises a bank (61, 61) connected to the body (2) and configured to support the rotors (8A, 8B) and a cover (62, 62) connected to the bank (61, 61) so as to define an inner volume (65, 65) comprised between the cover (62, 62) and the bank (61, 61) and designed to house, in use, a lubricating bath. According to the invention the compressor comprises a generator unit for generating a forced flow of cooling gas and, for at least one of the headers (6, 6), the bank (61, 61) defines a cooling chamber (70, 70) physically separated from the operative chamber (5) and from the inner volume of lubricant. Said chamber (70, 70) comprises an inlet (71, 71) and an outlet (72, 72) for a cooling gas, where said inlet communicates with the generator unit of the forced flow of said cooling gas.

A screw compressor includes a screw rotor having a plurality of helical grooves, a first rotor configured to mesh with the helical grooves of the screw rotor, a second rotor configured to mesh with the helical grooves of the screw rotor, and a casing having a partition wall rotatably retaining the screw rotor and covering an outer peripheral surface of the screw rotor. The partition wall includes first and second envelope portions to form first and second compression chambers. The first compression chamber compresses a fluid introduced into the casing with a suction pressure to an intermediate pressure higher than the suction pressure. The second compression chamber compresses the fluid with the intermediate pressure to a discharge pressure higher than the intermediate pressure.

The present invention relates to a multi-stage vacuum pump comprising: first and second half-shell stator components and first and second end stator components which when assembled define a plurality of pumping chambers. The half-shell components are assembled together along respective pairs of mutual engaging longitudinal faces and the end stator components are assembled at the ends of the half-shell components at respective pairs of mutual engaging end faces. An annular channel is counter-sunk in at least one end face of each pair of mutual engaging end faces for receiving respective sealing members for sealing between the half-shell components and the end stator components. Recesses are counter-sunk at the end portions of the longitudinal faces for receiving a sealant and supports provide support for the annular sealing members at the recesses when the annular sealing members are received in the annular channels to resist protrusion of the annular sealing members into the recesses when compressed between mutually engaging end faces.

In a pump chamber (12), a male rotor (20) having claw portions and a female rotor (24) having recesses into which the claw portions enter are secured to rotating shafts (18a and 18b), respectively. The female rotor is provided with hollows on an upstream side in the rotational direction of the female rotor relative to a plane L containing the rotating shafts. For the hollows, the disposed position, size and configuration are selected so that a compression pocket P and a discharge opening remain in communication with each other through the hollow throughout the time from when the compression pocket stops communicating with the discharge opening and separates from the discharge opening until the compression pocket gradually reduces to disappear, and so that the hollow stops communicating with the discharge opening at the same time as the compression pocket disappears.