Corrosion due to salt water, or the like, is prevented or suppressed between fastening end portions of housing members, while minimizing increase in production cost with respect to corrosion. A housing 10 of a compressor 1 has a front housing 11, a center housing 12, and a rear housing 13. The front housing 11 and the center housing 12 are fastened to each other by a plurality of fastening members 31, and mutual fastening end portions (111 and 121) thereof are welded together. The center housing 12 and the rear housing 13 are fastened to each other by a plurality of fastening members 32, and mutual fastening end portions (122 and 131) thereof are welded together. A weld bead W1 is formed between the fastening end portion 111 and the fastening end portion 121, and a weld bead W2 is formed between the fastening end portion 122 and the fastening end portion 131.

An electric pump includes a housing that includes a gear chamber, a rotor chamber, and a motor chamber. The electric pump includes a first seal member, a second seal member, and a third seal member. The first seal member seals a space between the gear chamber and the rotor chamber. The second seal member seals the space between the gear chamber and the rotor chamber. The third seal member seals a space between the gear chamber and the motor chamber. The third seal member seals the space between the gear chamber and the motor chamber to a lesser extent than the first seal member and the second seal member seal the space between the gear chamber and the rotor chamber.

A pump includes a first housing part defining a first portion of a bore extending within the first housing part and shaped to receive a rotor; and a second housing part defining a second portion of the bore extending within the second housing part and shaped to receive the rotor. The first housing part has a first face abutable against an opposing second face of the second housing part to position the first portion of the bore with the second portion of the bore to receive the rotor. The first portion of the bore has a first circular cross-section portion centered along the first face and the second portion of the bore having a second circular cross-section portion centered, within the second housing part, at a distance from the second face.

A multi-stage vacuum pump having an interstage coupling unit vacuum pump may include a first inter-stage coupling part defining a first portion of a void for receiving a common rotor shared by adjacent stages of the multi-stage vacuum pump; and a second inter-stage coupling part separable from the first inter-stage coupling part, the second inter-stage coupling part defining a second portion of the void for receiving the common rotor shared by adjacent stages of the multi-stage vacuum pump. In this way, a coupling is provided which enables an assembled rotor and assembled stages of the vacuum pump to be fixed together, since the assembled rotor can be received within the separable parts of the coupling which, in turn, can be fitted to the assembled adjacent stages. This enables the mechanical integrity of the rotor and adjacent stages to be preserved while still facilitating assembly of the multi-stage vacuum pump.

A method produces a housing of a rotary screw compressor, the housing having at least one housing body and at least one housing cover. The method includes the following steps: bearing seats for at least one screw rotor of the rotary screw compressor are provided in the housing body and in the housing cover; at least one screw borehole for the at least one screw rotor of the rotary screw compressor is provided in the housing body; the housing body and the housing cover are temporarily assembled using at least one alignment tool for ensuring the alignment of the screw rotor central axis with the central axes of the bearing seats and the screw borehole; and at least one bolt insertion opening is provided in both the housing body and the housing cover by at least one common production process.

A method produces at least one first screw bearing seat and at least one first inner wall region in a rotor housing. The rotor housing is part of a housing of a screw compressor. The method orients the rotor housing of the screw compressor, and produces the first screw bearing seat and the first inner wall region of the rotor housing in at least one joint production operation.

A screw compressor system for a utility vehicle has at least one screw compressor, at least one screw compressor drive with an output shaft, at least one driven screw with a screw drive shaft section. The output shaft and the screw drive shaft section are essentially coaxial.

An element for compressing a gas to be compressed at a low temperature of ?40? C. or lower, which element (1) is provided with a housing (2) containing at least one rotor (3) that is rotatably arranged with respect to the housing (2) and having an inlet (6) for the gas to be compressed and an outlet (7) for compressed gas, characterized in that the element (1) is configured for compressing the gas to be compressed having the low temperature by providing the element (1) with a heating duct (8) that runs through the housing (2), the heating duct (8) being provided with an inlet (9) where a first heat medium is introduced into the housing (2) at a higher temperature than the aforementioned low temperature and an outlet (10) where the first heat medium is evacuated from the housing (2).

The present disclosure relates to a simplified roots-type blower having an improved sound signature. The roots-type blower includes a rotor bore housing having a molded, one-piece polymeric construction. The rotor bore housing defines a first rotor bore and a second rotor bore. The rotor bore housing also defines a first bearing pocket corresponding to the first rotor bore and a bearing pocket corresponding to the second rotor bore axis. The rotor bore housing further defining a timing gear chamber.

The invention relates to a suction/compression assembly for aspirating/compressing gases from/in a system to/from an external environment. The assembly comprises an operating machine, a four-way valve, an intake pipe and an exhaust pipe connecting an intake section and an exhaust section of the operating machine to said four-way valve, respectively. The assembly is characterized in that it comprises a first body, which defines, in one piece, a chamber of the operating machine, a first portion of the intake pipe and a first portion of said exhaust pipe. The assembly further comprises a second body, which defines, in one piece, a seat of the four-way valve, a second portion of the intake pipe and a second portion of the exhaust pipe. Moreover, the assembly according to the invention comprises a one-way valve arranged within the intake pipe in a position adjacent to the seat of the four-way valve.