A scroll compressor includes a discharge guide disposed in a high-pressure part to guide refrigerant discharged from a compression part to a refrigerant discharge pipe, and the discharge guide may extend by a preset height from an inner circumferential surface of a casing constituting the high-pressure part toward one side surface of a high and low pressure separation plate. This can guide discharge refrigerant discharged to the high-pressure part to quickly flow to the refrigerant discharge pipe before being spread in an entire space of the high-pressure part, thereby preventing the high and low pressure separation plate from being overheated by discharge refrigerant of high temperature. This can result in preventing suction refrigerant of a low-pressure part from being heated by heat of discharge refrigerant transferred through the high and low pressure separation plate, thereby reducing a specific volume of the suction refrigerant and improving compressor efficiency.

A device for compression of a gaseous fluid, in particular of a refrigerant. The device comprises a housing with a suction pressure chamber and a high pressure chamber, a compression mechanism as well as a configuration developed in the proximity of the high pressure chamber, for the separation of a control mass flow from a fluid-lubricant mixture for the control of the compression mechanism. The configuration is developed and disposed with a first flow duct for diverting a main mass flow of the compressed fluid-lubricant mixture from the device and a second flow duct for conducting the control mass flow within the device to the suction pressure chamber in such manner as to separate a mass flow of the gaseous fluid as a control mass flow. A method for the separation of a control mass flow is also provided.

In a rotary compressor, a lower end plate cover is formed in a flat plate shape, a lower discharge chamber concave portion is formed in a lower end plate to overlap a lower discharge hole side of a lower discharge valve accommodation concave portion, and the lower discharge chamber concave portion is formed in a fan-like range between a diametrical line passing through a center of a sub-bearing unit and a midpoint of a line segment connecting a center of the lower discharge hole and a center of a lower rivet to each other and a diametrical line opened by a pitch angle 90° in a direction of the lower discharge hole about the center of the sub-bearing unit. At least a portion of a refrigerant path hole overlaps the lower discharge chamber concave portion and is disposed at a position communicating with the lower discharge chamber concave portion.

A housing for a rotary vane pump includes a suction flange and a discharge flange having a multi-angular cross-section with at least two sides extending parallel to each other, cooling ribs provided on an outer surface of the housing, with the number of cooling ribs in the region with a high internal pressure being greater than a number of cooling ribs in the region with a low internal pressure, inlet and outlet, with the inlet cross-section being greater than the outlet cross-section, and connection elements provided on the housing and each having two installation surfaces connected by a connection surface.

Embodiments provide a rotary lobe pump for conveying a fluid medium containing solids. Two rotary lobes have rotational axes that are spaced apart from each other a minimum length distance. A housing enclosing the two rotary lobes has an inlet opening and an outlet opening, each with a continuously decreasing convergence and defined lengths.

A gas compressor includes at least two first and second discharge ports (45a, 45b) which are provided at an upstream side in a rotation direction of a rotor (50) along a peripheral direction of an inner peripheral surface 40a of a cylinder (40) with respect to a closest area (proximity part (48)) where the inner peripheral surface (40a) of the cylinder (40) and an outer peripheral surface (50a) of the rotor (50) are closest in a range of one revolution of a rotation shaft (51) and configured to discharge the refrigerant gas compressed in compression chambers (43). Of the first and second discharge ports (45a, 45b), on only the first discharge port (45a) closest to the proximity part (48), a cutout groove portion (47) is provided at a downstream-side edge portion of the first discharge port (45a) in the rotation direction of the rotor (50).

A pump includes: a housing in which a pump chamber that is a columnar space is formed, the pump chamber being provided with a suction-side groove and a discharge-side groove that are formed as recesses; an outer rotor rotatably disposed in the pump chamber and having internal teeth on an inner periphery of the outer rotor; and an inner rotor disposed radially inward of the internal teeth of the outer rotor, and having external teeth formed on an outer periphery of the inner rotor and meshed with the internal teeth of the outer rotor. A portion of an inner edge of the discharge-side groove is located radially inward of a locus of tooth tips of the internal teeth of the outer rotor, the portion being located in a second half region of the discharge-side groove in a rotational direction of the inner rotor and the outer rotor.

A pumping system is provided, including a rough-vacuum pump; a Roots vacuum pump including a pumping stage having a stator inside which two Roots rotors are configured to rotate synchronously in opposite directions to drive a gas to be pumped between an inlet orifice and an outlet orifice; and a pipeline connecting the outlet orifice to an intake of the rough-vacuum pump, a shortest distance between an edge of the outlet orifice and each of the Roots rotors in the pumping stage being less than 3 cm, and the outlet orifice being situated at the end of an upstream tube of the pipeline that passes into the pumping stage.

The present disclosure relates to a compressor having a first rotor and a second rotor disposed within a housing, where the first rotor is configured to rotate about a first axis of the housing and the second rotor is configured to rotate about a second axis of the housing. The first rotor and the second rotor engage with one another such that rotation of the first rotor and the second rotor pressurizes a vapor within the housing. The compressor includes an end plate coupled to a discharge end of the housing, where the end plate includes a variable opening configured to discharge a flow of the vapor from the housing. The end plate also includes a first movable member and a second movable member that are configured to increase or decrease a cross-sectional area of the variable opening to adjust the flow of the vapor.

A compressor may include a casing having a refrigerant inlet space therein that communicates with a suction pipe through which a refrigerant is suctioned into the casing; a high/low pressure separation plate that crosses an upper portion of a compression unit to partition the refrigerant inlet space positioned at a lower portion of the high/low pressure separation plate and a refrigerant discharge space positioned at an upper portion thereof; and a discharge guide. The discharge guide may be provided in the refrigerant discharge space and may be coupled with an upper surface of the high/low pressure separation plate to cover a communication hole of the high/low pressure separation plate that provides communication between the refrigerant inlet space and the refrigerant discharge space and at least a portion thereof may extend to a discharge pipe.