Abstract: There is provided a compressor capable of feeding lubricating oil to a blade of a rotary type compression mechanism even if the oil level in an oil reservoir lowers. The compressor includes a low stage-side rotary type compression mechanism having a rotor, and a blade reciprocating with the rotation of the rotor while the tip end thereof is in contact with the rotor; a high stage-side scroll type compression mechanism for sucking and compressing refrigerant gas compressed by the low stage-side rotary type compression mechanism; a positive displacement lubrication pump for feeding lubricating oil to the high stage-side scroll type compression mechanism; and an oil feeding path for feeding the lubricating oil, which is fed to the high stage-side scroll type compression mechanism, toward the blade of the low stage-side rotary type compression mechanism.

Abstract: A rotary positive displacement pump for liquid medium having a main pumping mechanism driven by a magnetic coupling is disclosed. The positive displacement pump includes an integrated, positive displacement, circulating pump configured to provide a controlled medium flow through the magnetic coupling from a discharge side (0206) of the main pump back to a suction side (0205) of the main pump.

Abstract: The invention downsizes and simplifies structures of a compressor and its driving system apparatus, and achieves a reduction of a noise. An oil free screw compressor is constituted by compressor main bodies compressing a gas, a motor driving rotors of the compressor main bodies via step-up gears, a gear casing storing the step-up gears, cooling apparatuses cooling a discharge air and the like. An oil tank is provided independently from the gear casing, the motor is fixed to a common base, the gear casing is integrally attached to the motor via a flange, and the compressor main bodies are integrally attached to the gear casing via the flange. Further, the cooling apparatuses are arranged in an upper side of the driving system apparatus, and a cooling fan is installed in an upper side thereof.

Abstract: An oil lubricated compressor which includes a bypass oil line connecting respective oil paths upstream and downstream of the motor. The bypass oil path permits oil to be detoured around the motor in a tube that is external to the compressor shell and flows back into the shell near the scroll inlet. The oil bypass line returns “excess” oil directly to sump 28, rather than having it flow from sump 27 to sump 28 through an air-gap, thereby reducing both the drag on the motor and the input power.

Abstract: An improved, piston-based, pressure-transforming barrier fluid support apparatus is disclosed that can support both the pressurized and unpressurized barrier fluid requirements of a shaft-driven machine from a single unit. The disclosed apparatus includes both a pressurized section that stores, cools, cleans, and pressure regulates pressurized barrier fluid, and an unpressurized section that stores, cools, and cleans unpressurized barrier fluid. The disclosed apparatus causes debris in the pressurized barrier fluid to gravitationally migrate away from the piston, so as to prevent piston fouling. If the piston rod becomes detached, it is expelled downward for enhanced safety. Removable covers and/or a removable cylinder can provide enhanced access for cleaning and maintenance. Embodiments include a common cover that is shared by the pressurized and unpressurized sections and serves as a common manifold for cost-efficient fluid connections thereto.

Abstract: An oil pump for a compressor includes a driving shaft having an oil passage, a gear driving unit coupled to the drive shaft, a pump body having a driving shaft insertion groove, a friction reducing member assembled on the driving shaft insertion groove to reduce friction between the driving shaft and pump body, and a a gear unit coupled to the pump body and rotating with rotation of the driving shaft. The pump may further include a pump cover coupled to the pump body and having an intake for inhaling oil.

Abstract: In a rotating-slide vacuum pump or compressor having a rotor (6) which can rotate in a housing (2) and is driven by a drive shaft, and having slides (8) which can be moved outwards in the circumferential direction herein in slots (7) in the rotor (6) and separate individual feed chambers of a working area (9), which is provided with an intake opening (1) and an outlet opening, from one another, and each assume a maximum outer position adjacent to the housing inner wall, driven by centrifugal force, the arrangement is designed such that a brushless disc-rotor synchronous motor (11, 12) is fitted in the axial direction to the rotor shaft.

Abstract: A scroll compressor is provided. The scroll compressor includes a casing, an oil pump, an oil retrieving port, and an oil retrieving unit. The casing has a fluid storage area in a lower portion thereof. The oil pump is provided in the lower portion of the casing, and has a suction unit which suctions fluid from the fluid storage area. The oil retrieving port is in the casing to allow oil retrieved from an external oil separator to flow into the casing. The oil retrieving unit is connected to the oil retrieving port and provides a path which directs the retrieved oil to the suction unit.

Abstract: In a hermetically sealed compressor 100 including a rotary compressing element (4) having at least one cylinder (43A, 43B), and a roller (45) provided to the cylinder so as to be freely eccentrically rotatable, an electrically-driven element (2) for driving the roller (45) and a hermetically sealed container in which the rotary compressing element and the electrically-driven element are accommodated, oil (8) being stocked in the hermetically sealed container (1), the oil (8) in the hermetically sealed container (1) is injected into the compression chamber (43) when refrigerant is sucked into the compression chamber (43) of the cylinder.

Abstract: A horizontal type scroll compressor is provided with a support plate separating an inside of the sealed container into a first space in which the compressor mechanism portion and the electric motor portion are stored, and a second space in which the discharge pipe is provided, and a communication path communicating a bottom portion of the first space and a space above the drive shaft within the second space in a lower side of the support plate, and regulates an oil level by the communication path in the case that the oil level difference becomes large at a time of a high-speed operation. In order to stabilize the oil supply to the bearing or the like, the oil is supplied by an oil pump provided in a shaft end portion of the drive shaft close to an oil reserving chamber.

Abstract: There is disclosed a compressor which stably supplies oil to a sliding portion. The compressor includes an ejector oil pump which sucks the oil from an oil reservoir in the bottom part of a sealed container to an oil passage formed in a rotary shaft, and the ejector oil pump includes an oil suction pipe having one end connected to the oil passage and the other end which opens in the oil reservoir, and an ejector pipe having one end which communicates with the discharge side of a compression mechanism portion and the other end inserted into the opening of the other end of the oil suction pipe to open. The inner diameter of the other end of the oil suction pipe is larger than the outer diameter of the other end of the ejector pipe so that a gap for oil suction is constituted between both the pipes, and the other end of the oil suction pipe is provided with first and second dowel portions as positioning portions which position the other end of the ejector pipe.

Abstract: A hermetically sealed rotary compressor 100 including an electrically-driven element 2, a rotary compressing element 4 equipped with a cylinder 41 having a compression chamber 43 and a hermetically sealed container 1 in which oil 8 is stocked, is equipped with an oil path 62 for injecting the oil 8 into the compression chamber 43 when refrigerant is sucked into the compression chamber 43, and an opening/closing valve 80 for opening/closing the oil path 62 in accordance with the discharge pressure of the rotary compressing element 4 of the pressure of the compressed refrigerant compressed by the rotary compressing element 4.

Abstract: A vacuum pump includes a quick-rotatable component a bearing for supporting the quick-rotatable component and a lubricant pump for feeding lubricant to the bearing and having a rotor, with the bearing and the lubricant pump forming parts of a closed lubrication circuit having a hollow axle on which the rotor of the lubricant pump is rotatably supported.

Abstract: An oil pump of a scroll compressor is provided. The oil pump includes a pump body to which a drive shaft is inserted; a gear unit inserted to a lower side of the pump body and rotating by the rotation of the drive shaft; and a pump cover coupled to a lower side of the pump body and including an inlet through which oil is introduced, an outlet through which the introduced oil is discharged to the drive shalt, and one or more noise reducing portions reducing noise generated during a pumping process.

Abstract: An oil pump for a compressor is provided. The oil pump includes a pump body coupled to a driving shaft, and a pumping member coupled to the pump body so as to define a pumping part and a pump cover is coupled to a lower side of the pump body therebetween. A lower suction unit provided at a lower side of the pump body draws fluid into the pump from a lower portion of a supply area, and an upper suction unit draws fluid into the pump from an upper portion of the oil supply area.

Abstract: Previous compressors have employed compressors to compress and circulate refrigerant through a circuit, and have been unable to combine the differing advantages of rotary compressors, scroll compressors and screw compressors. The present invention combines these advantages, as well as inhibiting refrigerant leakage and improving overall performance, by particularly fixing the position of the compression member of the compression element relative to the driving element. The driving element is stored in a sealed container of the compressor. The compression element includes a cylinder having suction and discharge ports and a compression member which compresses a fluid (refrigerant) sucked from the suction port to discharge the fluid via the discharge port; and a vane partitioning the compression space in the cylinder into a low pressure chamber and a high pressure chamber.

Abstract: A scroll compressor is provided with an orifice plug inserted into an oil passage. The plug has an opening which is positioned to restrict the flow of oil through the passage, and in particular at higher speeds. The opening is formed at an outer periphery of the plug, and may be positioned at a location spaced furthest from the center of rotation of the shaft.

Abstract: In a hermetically sealed compressor 100 including a rotary compressing element (4) having at least one cylinder (43A, 43B), and a roller (45) provided to the cylinder so as to be freely eccentrically rotatable, an electrically-driven element (2) for driving the roller (45) and a hermetically sealed container in which the rotary compressing element and the electrically-driven element are accommodated, oil (8) being stocked in the hermetically sealed container (1), the oil (8) in the hermetically sealed container (1) is injected into the compression chamber (43) when refrigerant is sucked into the compression chamber (43) of the cylinder.

Abstract: To provide a single stage root type-vacuum pump which can prevent an increase in an installation space while achieving a fine anti-corrosion property, and can shorten discharge time by preventing a drop in a pumping flow rate when pumping by reverse rotation, and to provide a vacuum fluid transport system employing this single stage root type-vacuum pump. A pair of outside air introduction holes (22, 22) is formed in the vicinity of a phantom line (m) in an inner wall surface (6c) within a range between intersecting points (q, q), where the intermediate position (p) is located between the center of a driving side Root type-s rotor shaft (11) and the center of a driven side Root type-s rotor shaft (12) of three-lobe rotors (20, 21), and where the intersecting points (q, q) are the points at which internal circles located on the extended circumferences of the inner wall surface (6c) of the casing (6) intersect with the intermediate position (p).

Abstract: A vacuum pump includes a housing assembly having an oil-reservoir chamber in which a lubricating oil is stored; a pair of screw rotors disposed in the housing assembly and engaged with each other; a pair of rotary shafts connected to the rotors, respectively; a plurality of bearings supporting each of the rotary shafts and having an opening; an oil-feed pump for feeding the lubricating oil from the oil-reservoir chamber to the bearing; an oil-circulation passage provided for circulating the lubricating oil from the oil-feed pump to the oil-reservoir chamber through the bearing; a cover provided at the opening of the bearing to close the opening of the bearing with a clearance remained, the cover permitting the lubricating oil to enter the bearing through the clearance; and an oil-escape passage provided adjacent to the bearing for returning to the oil-reservoir chamber the lubricating oil not entering the bearing.

Abstract: A compressor comprises, in a container body, an electric element, and a compressive element driven by the electric element. An oil storage is provided in the bottom, and an oil pump is provided to suck up oil from the oil storage. The oil pump includes a cylinder fixed to a lower support frame, a rotator axially installed on the lower end of a driveshaft and operative to rotate within an inner space of the cylinder, and a suction pipe having an upper end connected to a communication notch formed in the cylinder and a lower end inserted and arranged in the oil storage. In this compressor, the upper end of the suction pipe is protruded into the communication notch of the cylinder to configure an oil residue pool.

Abstract: A cup-shaped shield surrounds a counter weight on the lower end of a rotor of the refrigeration compressor. The shield advantageously restricts lubricant flow to the rotating lower end of the rotor whereby power consumption of the motor is reduced. The shield may be axially and/or rotationally limited by engagement with a lower bearing assembly. The shield may be used on a scroll compressor. The shield may also be used on a rotor without having a counter weight on the lower end thereof.

Abstract: After a vane 4 passes an oil supply groove 13 formed in a housing 2 due to rotation of a rotor 3, a branch passage 12a of an oil supply passage formed in a shank 3B of the rotor communicates with the oil supply groove 13, then a lubricating oil flows into a pump room 2A through the oil supply groove 13. Then, owing to a differential pressure between a first space A and a second space B, the lubricating oil which flowed into the first space is spouted in the direction opposite to the rotational direction, being blown against the vane which subsequently passes, thereby sealing a gap between the vane and the pump room can be rapidly carried out. Even if the lubricating oil is not sufficiently fed into the pump room, a vane pump can rapidly exert its original performance.

Abstract: A hermetic compressor uses an oil pump that includes a trochoid gear. Therefore, regardless of the rotation speed of a driving motor of the compressor, a sufficient amount of oil can always be pumped. The oil pump unit may include a plurality of suction holes with openings at different heights. If the refrigerant and oil separate, at least one of the openings will admit oil into the oil pump unit, to ensure lubricating oil is supplied to the moving parts of the compressor.

Abstract: A vacuum pump for producing low or high vacuum includes a housing (1?) having an inlet (9) and an outlet (9), a pumping system (30) for compressing gas, a motor (25, 26) for driving the pumping system (30), and a fan (6) for cooling the pump and having its own motor (6a) for driving the fan (6).

Abstract: A compressor having a driving element stored in a sealed container of the compressor, and a compression element driven by a rotary shaft of the driving element. The compression element has a cylinder in which a compression space is constituted; a suction port and a discharge port which communicate with the compression space in the cylinder; a compression member whose one surface crosses an axial direction of the rotary shaft and is inclined continuously between a top dead center and a bottom dead center and which is rotatably disposed in the cylinder; and a vane which is disposed between the suction port and the discharge port to abut on an upper surface as one surface of the compression member and which partitions the compression space in the cylinder into a low pressure chamber and a high pressure chamber. One surface of the compression member is disposed on a side opposite to the driving element.

Abstract: An oil feeding propeller of a scroll compressor for preventing deterioration of oil feeding generated when a rotation shaft is rotated in reverse is disclosed. The propeller is tightly fitted into the lower side of the oil passage of the rotation shaft, sucks oil into the shell due to rotation shaft of shaft to raise oil to a compression part of the scroll compressor. The propeller includes a plate without operative direction for feeding oil in a predetermined direction so as to raise a predetermined quantity of oil regardless of the rotation direction shaft.

Abstract: A compressor comprises an oil storage provided in the bottom of a container body. An oil cup is fixed in communication with the oil storage. An oil pump is attached to the lower end of a shaft and inserted into the oil cup. A rotation inhibitor is provided including a plurality of plates each having one end fixed to the inner wall of the oil cup and the other end disposed almost vertically toward the central axis of the oil cup. The plate has an upper end located in the vicinity of the upper edge of the oil cup, a lower end located in the vicinity of the bottom of the oil cup, and side ends located in the vicinity of the outer wall of the oil pump.

Abstract: A device (1) for driving an oil pump (2) for a transmission of a motor vehicle, having a pump housing (4), a transmission housing (3), a pump shaft (8), and a gear shaft (13), which is in rotationally fixed connection with the pump shaft (8). The gear shaft has a gearwheel (14) and is mounted in the transmission housing as part of a gear stage. It is proposed that the gear shaft (13) is bearing-mounted on both sides of the gear wheel.

Abstract: A screw-type vacuum pump (1) includes a pump housing (2, 6) with rotors (3, 4). A liquid cooling system cools the rotors and a drive motor (9). In order to improve the cooling of said pump, an external air-flow impelled cooling system is also provided for the pump housing (2, 6).

Abstract: A horizontal rotary compressor is configured such that an electrically powered compressor body is accommodated in a horizontally long hermetic receptacle in which a lubricating oil is accumulatively preserved, an interior of the hermetic receptacle is partitioned by a partition member into an oil storage portion space in which the compressor mechanism portion is positioned and an electric motor side space in which the electric motor portion is positioned, an oil communication portion is provided below the partition member, a gas communication opening is provided in an upper portion of the partition member, and an oil feed passageway is formed of a center opening, an oil guide opening, and oil suction tubing along the rotation axis.

Abstract: A sealed electric compressor for use in, for example, an electric refrigerator, generates a little noise and can feed any moving part of its compressing element with refrigerator lubricant. An oil pickup tube is joined by insertion to the lowermost end of a crank shaft and includes a first centrifugal pumping portion and a second centrifugal pumping portion provided continuously and arranged at a smaller angle than that of the first centrifugal pumping portion. The second centrifugal pumping portion arranged at a smaller angle can spin in a pool of the refrigerator lubricant.

Abstract: The invention relates to a water-injected screw compressor which comprises a compressor element (1) with an interior space (3), a suction conduit (7) which connects to an inlet part (6), situated at the top of this interior space (3), a pressure conduit (9) in which a vessel (10) is installed, and an injection conduit (22) between the vessel (10) and the interior space (3), which comprises a part (31) which is situated higher than the upper side of the inlet part (6). A connection conduit (36) is provide between the inlet part (6), on one hand, and a connection point, situated above the maximum water level (35) of the vessel (10), onto the part (32) of this injection conduit (22) extending downward towards its exit, on the other hand.

Abstract: A screw vacuum pump (1) has shafts (7, 8) and rotors (3, 4) secured to the shafts. Each rotor has a central hollow chamber (31) which receives the shaft or contains in built-in components rotating along with the rotor to define a relatively thin annular slot segment (32) for cross-flow circulation of coolant. The annular slot segment is disposed between the built-in components and an inner wall of the rotor's hollow chamber and between a suction side and a delivery side of the rotor. Separate feed and discharge lines (41, 55, 63, 77, 78, 81, 89, 99, 101, 103) circulate the coolant through the annular slot segment in such a way that the coolant remains cavitation-free and bubble-free.

Abstract: A hermetic rotary compressor including a housing having an oil sump formed therein; a stationary shaft fixedly mounted in the housing, a longitudinal bore formed in the shaft; and a motor mounted in the housing, the motor having a rotor and a stator, the rotor having a first and second end and being rotatably mounted on the shaft. A pair of compression mechanisms is rotatably mounted on the shaft, the compression mechanisms rotatably coupled to the rotor and lubricated with oil conducted through the longitudinal bore. Each of the compression mechanism has an outboard bearing rotatably mounted on the shaft, and an oil pump in fluid communication with the longitudinal bore is also mounted on the stationary shaft, the pump operatively engaged with one of the outboard bearings. The oil pump is actuated by rotation of one of the outboard bearings, and oil is pumped from the sump into the longitudinal bore by the oil pump.

Abstract: A vacuum pump draws gas by operating a gas conveying body in a pump chamber through rotation of a rotary shaft. The vacuum pump has an oil housing member, a stopper and a circumferential wall surface. The oil housing member defines an oil zone adjacent to the pump chamber. The stopper has a circumferential surface. The stopper is located on the rotary shaft to rotate integrally with the rotary shaft and prevents oil from entering the pump chamber. The center of curvature of the circumferential wall surface coincides with that of the rotary shaft. The circumferential wall surface surrounds at least a part of the circumferential surface of the stopper that is above the rotary shaft. The circumferential wall surface is inclined such that the distance between the circumferential wall surface and the axis of the rotary shaft decreases toward the oil zone.

Abstract: A Roots pump rotates a plurality of rotors by a pair of rotary shafts to draw gas. Each rotary shaft extends through a rear housing member of the Roots pump. An annular shaft seal is fitted around each rotary shaft and is received in a recess formed in the rear housing member. A helical groove is formed in a circumferential side of each rotary shaft. Each helical groove urges oil between the circumferential side of the associated shaft seal and the circumferential wall of the recess to move from a side corresponding to pump chambers toward a gear accommodating chamber when the associated rotary shaft rotates. This preferably prevents oil from leaking to the pump chambers.

Abstract: A Roots pump rotates a plurality of rotors by a pair of rotary shafts to draw gas. Each rotary shaft extends through a rear housing member of the Roots pump. An annular shaft seal is fitted around each rotary shaft and is received in a recess formed in the rear housing member. A labyrinth seal is located between an end surface of each shaft seal and the bottom of the associated recess. This enlarges the diameter of each labyrinth seal, thus preferably preventing oil from leaking to a pump chamber.

Abstract: The invention9) relates to a screw vacuum pump (1) comprising shafts (7,8) and two rotors (3, 4)10) secured to the shafts, whereby each rotor has a central hollow chamber (31) provided with devices for circulating a coolant. In order to effectively cool the rotors (3, 4), built-in components rotating along with the rotor arc located in the chamber (31) of the rotors (3,4), said components forming a relatively narrow, annular slot segment (32) that is cross-flown by the coolant. The corresponding annular slot segment (32) extends between the built-in components and the corresponding inner wall of the rotor's hollow chamber (31) and between the suction side and the delivery side of the rotor (3,4). Supply of the annular slot segment (32) with coolant is carried out via separate feed lines and discharge lines traversing the shaft. Means are provided to ensure cavitation-free and bubble-free flow through the annular slot segment.

Abstract: In an oil-free type screw compressor including a low-pressure-stage compressor main body and a high-pressure-stage compressor main body, when the power of an motor is transmitted to an oil pump via a gear to start the pump, the lubrication oil stored in an oil sump formed at the bottom of a gear casing flows through an oil strainer. A part of the oil is introduced to an oil cooler, while the rest is introduced to a junction portion by bypassing the oil cooler. Further, a part of the oil introduced to the oil cooler is directed to the junction portion. After adjusting the temperature of the oil appropriately, it is introduced to a lubrication portion of the compressor, while the oil cooled by the oil cooler using the full capacity thereof is introduced to oil jackets of the compressor main bodies via different passages.

Abstract: A cooled screw vacuum pump has a housing (4) two rotating systems (5, 6) consisting each of a screw rotor (5) and a shaft (6), a floating device supporting the rotors having, on each shaft, two mutually spaced bearings (7, 8) and an empty space (31) arranged in each rotor (5) open on the bearing side, wherein is respectively located an element cooling the rotor internally. In order to improve cooling it is suggested that the bearing (7) of the support located on the rotor side, is placed outside the rotor (5) empty space (31), such that in said empty space (31) there is more room available for obtaining efficient cooling.

Abstract: In an oil-free type screw compressor including a low-pressure-stage compressor main body and a high-pressure-stage compressor main body, when the power of an motor is transmitted to an oil pump via a gear to start the pump, the lubrication oil stored in an oil sump formed at the bottom of a gear casing flows through an oil strainer. A part of the oil is introduced to an oil cooler, while the rest is introduced to a junction portion by bypassing the oil cooler. Further, a part of the oil introduced to the oil cooler is directed to the junction portion. After adjusting the temperature of the oil appropriately, it is introduced to a lubrication portion of the compressor, while the oil cooled by the oil cooler using the full capacity thereof is introduced to oil jackets of the compressor main bodies via different passages.

Abstract: A trochoidal design rotary piston engine design has a rotary piston housing with a double curve inner contour and triangular type rotary pistons. Sliding bearings distribute lubricating oil from a pressure cycle into a high pressure circuit and a low pressure bypass circuit branches to the side parts and axial cooling channels of the rotary piston housing to supply the cooling oil.

Abstract: A dry-compressing screw pump in the form of a two-shaft positive displacement pump. A first and a second rotor spindle are disposed parallel to each other. The rotor spindles are hollow. A cooling medium is fed at a first front face of the rotor spindles and evacuated at a second front face of the rotor spindles. A cooling medium feeding and evacuation means is connected to an external cooling medium circuit. The inner diameter of the rotor spindles monotonously increases from the first front face toward the second front face so that the cooling medium is conveyed from the first front face to the second front face substantially under the influence of centrifugal force acting on the cooling medium due to the rotation of the rotor spindle.

Abstract: A Roots pump rotates a plurality of rotors by a pair of rotary shafts to draw gas. Each rotary shaft extends through a rear housing member of the Roots pump. An annular shaft seal is fitted around each rotary shaft and is received in a recess formed in the rear housing member. A helical groove is formed in a circumferential side of each rotary shaft. Each helical groove urges oil between the circumferential side of the associated shaft seal and the circumferential wall of the recess to move from a side corresponding to pump chambers toward a gear accommodating chamber when the associated rotary shaft rotates. This preferably prevents oil from leaking to the pump chambers.

Abstract: A trochoidal design rotary piston engine design has an external axis cogwheel oil pump which has a smaller diameter drive cogwheel which drives a larger diameter size cogwheel where the larger diameter size cogwheel is coupled to an oil-metering pump. The larger cogwheel is supported in a side disk disposed at one side of an engine housing forming a combustion engine.

Abstract: A Roots pump rotates a plurality of rotors by a pair of rotary shafts to draw gas. Each rotary shaft extends through a rear housing member of the Roots pump. An annular shaft seal is fitted around each rotary shaft and is received in a recess formed in the rear housing member. A labyrinth seal is located between an end surface of each shaft seal and the bottom of the associated recess. This enlarges the diameter of each labyrinth seal, thus preferably preventing oil from leaking to a pump chamber.

Abstract: A reciprocating hermetic compressor, of the type including a rotor with permanent magnets and having its tubular vertical shaft (5) provided radially externally to the internal surface thereof with at least one axial channel (10) of oil conduction, having a lower end (11) immersed in the lubricant oil being pumped from a lubricant oil sump (2) defined at the bottom of the hermetic shell of the compressor, and an upper end (12) opened to a median radial duct (5a), which conducts lubricant oil to the parts of the compressor spaced away from the lubricant oil sump (2).

Abstract: A screw compressor has a gear housing (1) from one side of which the rotor housing (3) containing the two screw rotors freely projecting outward. An oil supply container (7) is also located freely projecting out from the gear housing (1) approximately parallel to the rotor housing (3) and thermally separated from the rotor housing by means of an air gap. A ventilation channel (109) in the rotor housing (3) to vent the rotor shaft seals opens up to one point in the rotor housing that is protected against direct access by the oil supply container (7) mounted in front of it as well as by additional shoulders (111).

Abstract: A screw-type pumping unit (51) for treatment of fluids in several phases comprises a case (54) which contains a pumping chamber (62), inside which there are accommodated at least two screws (70a, 70b), one of which (70a) is a drive screw, and supports at one of its ends a first gear (108a), which engages with a second gear (108b), which in turn is supported at one end of a driven screw (70b). The first and the second gear (108a, 108b) are contained in a casing (110) which is fitted onto them, and is provided with at least two through holes (112, 114) produced in two substantially opposite portions, through one of which oil can be admitted into the casing (110), and wherein the oil can be discharged through the other through hole (114), such that the casing (110), together with the gears (108a, 108b), forms a gear pump which can keep the lubrication oil of the pumping unit (51) circulating.