Abstract: Methods and apparatus for storing high-pressure, high-purity oxygen in a pressure vessel for use in the home health care or related fields as for ambulatory patients, persons confined to wheelchairs, and those who are bedridden. The Oxygen may be produced from air an oxygen-enriched gas and stored in a concentrator product tank. After reaching a predetermined pressure, the gas is fed to a compressor where it is compressed to a high pressure and stored in a mobile or portable high-pressure container. A patient can thus have increased mobility through use of the portable, one or more high-pressure oxygen containers.

Abstract: The aim of the invention is to provide a simple, smoothly running pump, especially a slurry pump, preferably for concrete, which comprises a driven rotor (4) rotating inside a housing (2). According to the invention, the rotor (4) is configured as a polygonal, prismatic body wherein at least the connecting lines of the corners of the base form an equilateral polygon. The rotor performs a rotational movement about its center axis on an orbit, the longitudinal edges of the prismatic body (4?) touching the longitudinal inner wall surface (2?) of the housing (2).

Abstract: A refrigerant compressor that enhances compressor efficiency by both reducing an amplitude of pressure pulsations and reducing pressure losses in a discharge muffler space into which is discharged a refrigerant compressed at a compression unit. A low-stage discharge muffler space is formed in the shape of a ring around a drive shaft. In the low-stage discharge muffler space, a discharge port rear guide is provided in the proximity of a discharge port through which is discharged the refrigerant compressed by a low-stage compression unit. The discharge port rear guide is provided at a flow path in one direction out of two flow paths from the discharge port to a communication port in different directions around the drive shaft, and prevents the refrigerant from flowing in that direction, thereby causing the refrigerant to circulate in a forward direction in the ring-shaped discharge muffler space.

Abstract: The present disclosure includes an engine having a torodial piston chamber, at least one piston positioned in the torodial piston chamber, and at least one engine valve positioned to interact with the torodial piston chamber.

Abstract: A positive displacement rotary machine with a body having an internal spherical working surface divided into bypass and propulsion areas, a rotor with a working rotational surface, a ring working cavity formed by the working surfaces of the body and rotor, and a C-shaped separator mounted in part of the cavity at an angle to a plane of the rotor rotation. The cavity is partitioned by the separator at the bypass area, and the working medium openings are located from opposite sides of the separator. The working surface of the rotor has at least one slot. In each slot is mounted a piston capable of sealing the working cavity, and performing rotational oscillations in a slot plane. The piston is at least in the form of a part of a disk and has at least one through-cutout for the separator passage, and can seal the through-cutout at the propulsion area.

Abstract: A variable output assembly including a hydraulic pump disposed on a pump running surface located on a center section, end cap or other hydraulic mounting member. The pump may be a gerotor or other rotatable pump body. A support member is disposed between the pump running surface and the pump and includes a pump support surface having openings to permit fluid communication between the support member and the pump running surface. A motor assembly may be hydraulically connected to the pump running surface by a first porting system, and a sump is hydraulically connected to the pump running surface by a second porting system. The support member is movable between neutral and a plurality of positions corresponding to forward and reverse directions of the output.

Abstract: A crankshaft is to be provided that allows its assembly process to be simplified, work hours required for the assembly process to be shortened and a manufacturing cost to be reduced. The crankshaft is provided with first eccentric section and second eccentric section at respective ends while interposing a shaft section therebetween and has such a shape that a peripheral edge of the first eccentric section and/or the second eccentric section is positioned radially inside of a peripheral edge of the shaft section.

Abstract: Provided is a vacuum pump having a rotation body cleaning unit. The vacuum pump includes a case provided with rotation guide holes at opposite end parts. The case includes a rotation body placed inside the case and including a rotation shaft having opposite ends rotatably supported by the rotation guide holes and a number of lobes provided in the rotation shaft at predetermined intervals. Further, a cleaning part is supported by the case and placed in a space between the lobes and cleans the rotation body.

Abstract: A rotary-type fluid machine (10A) includes: a closed casing (1) having a bottom portion utilized as an oil reservoir, a rotary-type fluid mechanism (expansion mechanism) (15) that is provided in an upper portion of the closed casing (1) and in which working chambers (32, 33) in cylinders (22, 24) are partitioned into a suction side working chamber and a discharge side working chamber by vanes (28, 29), a shaft (5) having therein an oil supply passage (51) for supplying oil to the fluid mechanism (15), the shaft being connected to the fluid mechanism (15) and extending an oil reservoir (45), an oil pump (52) provided at a lower portion of the shaft (5), an oil retaining portion (65) for retaining oil, which is pumped up by the oil pump (52) and supplied through the oil supply passage (51), in a surrounding region around the fluid mechanism (15) to allow the partitioning members of the fluid mechanism (15) to be lubricated, the oil retaining portion formed so that the liquid level of the oil retained therein is

Abstract: A sliding vane rotary expander is used in a waste heat recovery system for a power plant. One example rotary expander has multiple stages with the vane assemblies disposed in bearing supported rings. Another example rotary expander has multiple stages with the vane assemblies disposed in an elliptical cavity. A balance valve equalizes the flow within the stages. Single stage rotary expanders may also be used.

Abstract: A three stage vacuum pump has three stages of fixed scrolls and orbiting scrolls that operate simultaneously. A motor drives the second orbiting scroll within the third fixed scroll upon three equally spaced idlers. One idler then transmits rotation and torque into the second stage. The second orbiting scroll to has involutes upon both surfaces to engage the second fixed scroll inwardly and the first fixed scroll outwardly. The first fixed scroll has fins upon its back that extend into the atmosphere to transfer heat to air cool the invention. This pump also has a fan accelerating heat transfer. The pump operates the scrolls directly from a motor or from a motor and magnetic coupling so that the atmosphere does not infiltrate the pump.

Abstract: The present technology is directed generally to rotary displacement systems and associated methods of use and manufacture. The systems can be used to compress and/or expand compressible fluids. In some embodiments, the rotary displacement systems include a chamber housing having a pressure-modifying chamber with a first port and a second port, a first passageway in fluid communication with the chamber via the first port, and a second passageway in fluid communication with the chamber via the second port. The systems can further include a shaft positioned within the chamber housing and rotatable relative to the chamber housing about a rotational axis, and a rotor comprising no more than two lobes.

Abstract: The present invention provides a 2-stage rotary compressor which includes a hermetic container, a rotating shaft provided in the hermetic container and transferring a rotation force, a low pressure compression assembly including a low pressure roller eccentrically rotated around the center of the rotating shaft, a low pressure cylinder accommodating the low pressure roller, and a low pressure vane partitioning the inner space of the low pressure cylinder, a high pressure compression assembly including a high pressure roller eccentrically rotated around the center of the rotating shaft, a high pressure cylinder accommodating the high pressure roller, and a high pressure vane partitioning the inner space of the high pressure cylinder, a connection pipe providing a passage so that the refrigerant compressed in the low pressure compression assembly can be introduced into the high pressure compression assembly, and an injection pipe connected to the connection pipe.

Abstract: A twin rotary compressor is provided. In the twin rotary compressor, a refrigerant suction pipe may be connected to a middle plate positioned between a first cylinder and a second cylinder to reduce a height of the first cylinder, so that heights of a first rolling piston and a first vane may also be lowered. This may allow a contact area between the first rolling piston and the first vane to be decreased so as to reduce refrigerant leakage from a first compression space of the first cylinder, resulting in improvement of compression efficiency of the compressor.

Abstract: An apparatus is provided for compressing a loose solid feedstock. The apparatus includes a two stage compressor. The first compression stage is a screw compressor. The second compressor stage is a reciprocating compressor. The reciprocating compressor operates co-axially with, and receives its feed from, the screw compressor. A choke cone maintains pressure in the outfeed from the compressor stages. The reciprocating compressor, the screw compressor, and the choke cone are all adjustable in real time to control the compression of the feedstock according to a pre-programmed schedule that need not have equal compression and retraction strokes. The operation of the screw compressor may be advanced or eased off depending on the motion of the reciprocating compressor. The operation of the choke cone may be actively controlled to obtain a coordination with the compressor stages.

Abstract: An expander-integrated compressor (100) includes: a compression mechanism (2) for compressing a working fluid; an expansion mechanism (3) for expanding a working fluid; and a shaft (5) that couples the compression mechanism (2) and the expansion mechanism (3). The expansion mechanism (3) includes a variable vane mechanism (60). The variable vane mechanism (60) controls the movement of a first vane (48) so that the ratio of a period P2 to a period P1 (P2/P1) can be adjusted, where P1 denotes the period during which the first vane (48) is in contact with a first piston (46) in the course of one rotation of the shaft (5), and P2 denotes the period during which the first vane (48) is spaced from the first piston (46) in the course of one rotation of the shaft (5).

Abstract: Methods and systems for pulse generation assembly that includes a plurality of staged valves operably coupled serially in a bottomhole assembly of a wellbore tool. The plurality of staged valves are operated in a substantially synchronized manner, thereby generating a series of pressure pulses. The signal strength of the generated pulse signal is multiplied by the number of staged valves in the series, and the pulse generation assembly of the disclosure is less susceptible to jamming, shock, and erosion. Further, by sequentially stopping at least one stage of the assembly and then synchronously rotating other stages, amplitude modulation is accomplished.

Abstract: In an embodiment, a vacuum pump is capable of preventing adhesion of by-products to its surfaces. The vacuum pump includes a stator. The stator includes a cylinder wall and a pair of diaphragms disposed at opposite ends of the stator. A rotary shaft passes through the diaphragms, and a lobe is attached to the rotary shaft in the stator. The lobe may include a fluid port, and the fluid port may be disposed in sidewalls of the lobe to face the diaphragms. The rotary shaft may include a fluid supply path in communication with the fluid port.

Abstract: A multistage compressor employing a gas injection system for CO2 cycle that attains enhancements of compression efficiency and compression performance. The multistage compressor is multistage compressor (2) for CO2 cycle (1) adapted to carry out two-stage compression involving emitting the CO2 refrigerant gas compressed by inferior-stage side rotary compression means (4) into sealed housing (3) and having the intermediate-pressure refrigerant gas within the sealed housing (3) suctioned by superior-stage side scroll compression means (5), wherein to the sealed housing (3), there is connected gas injection circuit (15) capable of injection of intermediate-pressure CO2 refrigerant gas extracted from a refrigerant circuit into the sealed housing (3), and wherein the inferior-stage side rotary compression means (4) and the superior-stage side scroll compression means (5) are approximately identical with each other in pressure ratio and approximately equivalent with each other in displacement ratio.

Abstract: A motor and a method of operating the motor are described. The motor may have a female rotor shaft having mounted thereon a female compression rotor, a female power rotor, and a spur gear. The motor may also have a male rotor shaft having mounted thereon a male compression rotor, a male power rotor and a power rotor gear. A housing containing the foregoing may have a front housing plate, a compression rotor case, an isolator plate, a power rotor case, a rear housing plate, and a gear cover adjacent the rear housing plate. The various female and male rotors are engaged with one another within the housing.

Abstract: Oil supply grooves (74, 84) are formed respectively in a rotating shaft (70) of a compression mechanism (50) integral with an electric motor (40) and in a rotating shaft (80) of an expansion mechanism (60). The rotating shafts (70, 80) are coupled together by engagement between an engagement convex portion (85) and an engagement concave portion (75) which are formed respectively in shaft ends of the rotating shafts (70, 80). And, a seal groove (S) is formed in the peripheral surface of the engagement convex portion (85) and an O-ring (R) is engaged into the seal groove (S). Hereby, lubrication oil leakage from between the engagement convex portion (85) and the engagement concave portion (75) is prevented.

Abstract: There is provided a two-stage screw compressor including a first-stage compressor that compresses a fluid, a second-stage compressor that further compresses the fluid compressed by the first-stage compressor, a motor that drives the first-stage compressor and the second-stage compressor, and a box body that serves as a flow passage connecting an outlet of the first-stage compressor and an inlet of the second-stage compressor, and also forms a connection space storing a transmission mechanism for transmitting a rotation force from the motor to the first-stage compressor and to the second-stage compressor, wherein the connection space is sealed by the casing of the motor, and the connection space and an internal space of the casing of the motor communicate with each other.

Abstract: A method of pumping a gas stream containing a condensable species and a light gas and an apparatus therefore, the method comprising the steps of conveying the gas stream to a multistage vacuum pump comprising an inlet stage and an exhaust stage downstream from the inlet stage, and adding to the gas stream upstream of or at the inlet stage a purge gas heavier than said light gas to both inhibit migration of the light gas from the exhaust stage towards the inlet stage and to inhibit condensation of the condensable species within the pump.

Abstract: The invention relates to rotary machines, with nonparallel rotor and pistons axes of rotation. A spherical cavity (4) formed by a body (1) comprises a rotor (7), which is arranged therein and is provided with a through slot (21) in which a piston (8) in the form of a through-cutout (33) disk is mounted in such a way that it is enabled to perform rotational oscillatory motions. The working cavity is divided into bypass (2) and pressure (3) sections. A C-shaped separator (9) is placed in the bypass section (2) and separates the working medium input window (12) from the output window (13) thereof. In the pressure section (3), the working medium is pushed by the projecting part of the piston (8). The inventive spherical positive displacement rotary machine enables uniform flow rate throughout the cycle. The input and output windows are spaced along a shaft, thereby making it possible to develop, on the basis of said machine, multistage down-hole pumps and hydraulic drives.

Abstract: A multi-stage compressor unit for a refrigeration system configured to circulate a refrigerant comprises a first compressor sub-unit having a first stage and a second stage, and a second compressor sub-unit in parallel with the first compressor sub-unit and having a first stage. The first and second stages of the first compressor sub-unit each have a suction port and a discharge port. The first compressor sub-unit is configured to receive and compress a first portion of the refrigerant from an evaporator. The first stage of the second compressor sub-unit is configured to compress a second portion of the refrigerant.

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 1 includes a low stage-side rotary type compression mechanism 3 having a rotor 34, and a blade 38 reciprocating with the rotation of the rotor 34 while the tip end thereof is in contact with the rotor 34; a high stage-side scroll type compression mechanism 4 for sucking and compressing refrigerant gas compressed by the low stage-side rotary type compression mechanism 3; a positive displacement lubrication pump 60 for feeding lubricating oil 27 to the high stage-side scroll type compression mechanism 4; and an oil feeding path for feeding the lubricating oil 27, which is fed to the high stage-side scroll type compression mechanism 4, toward the blade 38 of the low stage-side rotary type compression mechanism 3.

Abstract: In a compressor provided with two compression mechanisms of a rotary type compression mechanism and a scroll type compression mechanism, torque fluctuations are reduced. The compressor 1 includes a hermetic housing 2, a low stage-side compression mechanism 3 and a high stage-side compression mechanism 4 provided in the hermetic housing 2; and an electric motor 21 for driving the low stage-side compression mechanism 3 and the high stage-side compression mechanism 4. The low stage-side compression mechanism 3 is a rotary type compression mechanism, and the high stage-side compression mechanism 4 is a scroll type compression mechanism. The suction shutoff of the scroll type compression mechanism is accomplished when a rotor 34 of the rotary type compression mechanism is at a position A corresponding to the bottom dead center, at a position B of being rotated through 90 degrees from the bottom dead center, or between the positions A and B.

Abstract: The invention relates to a device for feeding lubricating oil to an internal combustion engine. This device comprises a lubricating oil pump and an oil pressure regulating apparatus. The lubricating oil pump is designed as a reciprocating piston valve pump and the oil pressure regulating apparatus is designed as a multistage oil pressure regulating apparatus.

Abstract: A compressor with controlled capacity mainly includes a double cylinder compressor with a reservoir, a capacity switch device, the outlet for the intake pipe of the said reservoir is divided into two branches, which are connected with the upper and lower cylinder through a capacity switch device switched between the 2way-2through and oneway-2through switch to realize the connection in series or in parallel for the double cylinder, as a result, the discharge capacity of the compressor is that of the first stage cylinder when connection in series, or the sum of the two cylinders discharge amount when connection in parallel. The capacity switch device may be a special 4way-2way reversing valve or the combination of the single way valve and the general 4way reversing valve, or the combination of the solenoid valve and the general 4way reversing valve, or the combination of three solenoid valves, or the combination of a single way valve and two solenoid valves.

Abstract: A vacuum pump includes first, second, third and fourth pump stages. Each pump stage has a trochoidal-shaped cavity and a rotor that rotates within the respective cavity. Each cavity has a volume determined by the depth of the cavity and a generally corresponding thickness of the rotor. The fourth stage has a largest volume and receives gas at an input pressure. The fourth stage outputs the gas to the third stage at a second pressure higher than the input pressure. The cavity of each successive stage (third, second and first) has a smaller volume and outputs the gas at a higher pressure than the previous stage. The last (first) stage outputs the gas to the atmosphere. The rotors in the stages rotate about a common pump shaft. Each rotor has a multiple vertices that follow the inner perimeter surface of the respective cavity without contact and without requiring additional seals.

Abstract: A blending pump assembly for accurately maintaining the proper ratio of two fluid components. Flow of a first fluid is utilized to drive a fluid motor, which in turn drives a pumping mechanism to inject a proportional amount of a second fluid into the flow of the first fluid. The fluid motor and pump are sized so that a predetermined ratio between the two fluids is maintained regardless of changes in pressure and flow rate of such first fluid.

Abstract: A motor-pump unit is provided that has at least two internal gearwheel pumps axially aligned that are driven off of the rotor of the electric motor. The rotor of the electric motor is U-shaped and is concentrically disposed about the pump. The web of the U-shape is disposed in the region of the rotational axis with internal toothing that meshes with pinions of the at least two internal gearwheel pumps.

Abstract: An oil supply hole connecting an oil reservoir to a suction port formed in a lower supporting member of a two-stage rotary compressor is disclosed. The suction port is provided in the lower supporting member attached to the lower side of a high stage side rotary compressing element, and a necessary amount of oil is supplied into return refrigerant gas sucked into the high stage side rotary compressing element through this oil supply hole. Thus an outer circumferential surface of a roller, which eccentrically rotates in a cylinder, is lubricated to protect it from wear.

Abstract: A vacuum pumping system includes a primary vacuum pump having an inlet for coupling to a system, and a secondary vacuum pump having an inlet coupled to the exhaust of the primary vacuum pump. The primary vacuum pump is an oil-free, positive displacement vacuum pump having multiple clearance seals between the inlet and the exhaust. The primary vacuum pump may be a scroll vacuum pump, and the secondary vacuum pump may be an oil-free diaphragm pump. The system may include a valve coupled to the exhaust of the primary vacuum pump and configured to couple the exhaust of the primary vacuum pump to an interpump exhaust in response to a selected condition, such as the pressure level at the exhaust of the primary vacuum pump.

Abstract: A multi-chamber installation (1) treats objects under vacuum. An evacuation system (5) is connected to a plurality of chambers (2, 3, 4). To reduce the complexity of the evacuation process, a forepump (5) has several stages (11, 12, 13). Each of said stages is connected to one of the chambers (2, 3, 4).

Abstract: A blending pump assembly for accurately maintaining the proper ratio of two fluid components. Flow of a first fluid is utilized to drive a fluid motor, which in turn drives a pumping mechanism to inject a proportional amount of a second fluid into the flow of the first fluid. The fluid motor and pump are sized so that a predetermined ratio between the two fluids is maintained regardless of changes in pressure and flow rate of such first fluid.

Abstract: A roots pump has a housing, a plurality of rotary shafts, a rotor, a confluent passage and a closed space. The housing forms therein a pump chamber. The rotary shafts are supported on the housing in parallel relation to each other. The rotor is mounted on each of the rotary shafts, and the rotors on any adjacent rotary shafts are in engagement with each other. A set of the engaged rotors is accommodated in the pump chamber. The confluent passage is formed along one crossing line of paired imaginary swept peripheral surfaces in one-to-one correspondence with the paired and engaged rotors. The closed space is formed in one-to-one correspondence with each of the paired rotors between the paired rotors and paired peripheral wall surfaces which form the pump chamber. The closed space initially joins the confluent passage from a terminal end thereof with rotation of the paired rotors.

Abstract: An engine is disclosed including at least one piston which is positioned within a toroidal piston chamber. A method of operating an engine is disclosed wherein a piston is advanced in a toroidal piston chamber past a first valve and the first valve is closed to form a first ignition chamber area located within the piston chamber between the first valve and the rear side of the piston. A second valve is closed ahead of the piston to form a first exhaust removal chamber area located within the piston chamber between the second valve and the front side of the piston, the exhaust removal chamber including exhaust gases from a preceding ignition which occurred in the first ignition chamber area. A fuel mixture is introduced into the first ignition chamber area and ignited thereby advancing the piston further along the toroidal piston chamber.

Abstract: A multi-stage compression type rotary compressor, having a driving element and a first and a second rotary compression element that are driven by the driving element in a sealed container, is provided. The refrigerant compressed by the first rotary compression element is discharged into the sealed container, and said discharged refrigerant with an intermediate pressure is then compressed by the second rotary compression element. By cooling the refrigerant absorbed into the second rotary compression element, the rise in the temperature of the refrigerant that is compressed and discharged by the second rotary compression element can be suppressed. And, the supercooling degree of the refrigerant is increases before reaching the expansion valve to improve the cooling ability of the evaporator.

Abstract: A hermetic two stage rotary compressor having a housing with a stationary shaft fixedly mounted in the housing. A motor having a rotor and a stator is mounted in the housing with the rotor being rotatably mounted on the shaft. A pair of compression mechanisms are rotatably mounted on the shaft with one compression mechanism being located adjacent a first end of the rotor, and one compression mechanism being located adjacent a second end of the rotor. The compression mechanisms are operatively associated with the rotor such that rotation of the rotor drives the compression mechanisms. A fluid flow path is defined in the compressor including a plurality of longitudinal bores formed in the stationary shaft. A mounting assembly is attached to the housing so as to mount the compressor in either a substantially horizontal or vertical orientation. The pump is positioned so as to be at least partially immersed in an oil sump in the housing when the compressor in either orientation.

Abstract: A fluid machinery includes a helical mechanism connected to a driving mechanism, which is driven via a crank shaft. The helical mechanism includes a cylinder defining an inner space, a roller disposed inside the cylinder so as to be rotated in an eccentric manner, the roller being formed with a plurality of helical grooves on an outer peripheral surface, and at least one seal ring groove between respective helical grooves, a plurality of helical blades fitted to the helical grooves so as to be disposed between as inner peripheral surface of the cylinder and the outer peripheral surface of the roller, and at least one seal ring fitted to the seal ring groove so as to tightly seal the inner space as a plurality of operation sections. Furthermore, a plurality of suction ports and a plurality of drain ports, associated with respective operation sections, communicate with each other.

Abstract: A compact scroll pump includes a scroll set having an inlet and an outlet, and a drive mechanism. The scroll set includes a stationary scroll blade extending from a stationary plate and an orbiting scroll blade extending from an orbiting plate. The stationary and orbiting scroll blades are intermeshed together to define one or more interblade pockets. The orbiting scroll blade is located on a first side of the orbiting plate, and the drive mechanism is operatively coupled to a second side of the orbiting plate for producing orbiting motion of the orbiting scroll blade relative to the stationary scroll blade. The drive mechanism includes a motor and a crankshaft having an axis of rotation, and an orbiting bearing coupled between the crankshaft and the orbiting plate. The scroll set is configured such that an imaginary plane perpendicular to the axis of rotation passes through the orbiting bearing and at least a portion of the orbiting scroll blade.

Abstract: Vacuum pumping apparatus includes a scroll set having an inlet and an outlet. The scroll set includes a first stationary scroll blade and a second stationary scroll blade extending from a stationary plate and separated by a gap, and an orbiting scroll extending from an orbiting plate, wherein the first and second stationary scroll blades are intermeshed with the orbiting scroll blade to define one or more interblade pockets. The vacuum pumping apparatus further includes a relief port in the gap between the first and second stationary scroll blades and coupled through a relief passage to an exhaust, a relief valve in the relief passage, and a drive mechanism operatively coupled to the orbiting scroll element for producing orbiting motion of the orbiting scroll blade relative to the first and second stationary scroll blades.

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 scroll fluid machine has a low-pressure stage compression part for compressing a fluid sucked in from the outside between mutually overlapping wrap portions of two scroll members performing a relative orbiting motion and a high-pressure stage compression part for compressing the fluid sucked in from the low-pressure stage compression part between mutually overlapping wrap portions of two scroll members performing a relative orbiting motion. The scroll members in the low-pressure stage compression part have a larger radial gap between the wrap portions than that of the scroll members in the high-pressure stage compression part.

Abstract: A vacuum exhaust apparatus includes an oil-sealed rotary pump with a gas inlet for taking a gas into the pump. The gas inlet has a gas inlet flange to join with a flange of a gas inlet pipe for guiding the gas to the pump. An oil supply section connects with the gas inlet pipe and supplies an oil into the gas inlet pipe.

Abstract: A dry vacuum pump comprises a scroll-type vacuum pump and a rotary-vane vacuum pump, wherein the rotary-vane vacuum pump is mounted on the side of an inlet, whereas the scroll-type vacuum pump is mounted on the side of an outlet, and then a compound-type dry vacuum pump is formed by connecting and integrating the rotary-vane vacuum pump and the scroll-type vacuum pump, having the advantages of high compression ratio, high vacuuming speed, low production cost and simplified structure, thus improving the working effectiveness and quality of pumps accordingly.

Abstract: A dry vacuum pump comprises a scroll-type vacuum pump and a rotary-vane vacuum pump, wherein the rotary-vane vacuum pump is mounted on the side of an inlet, whereas the scroll-type vacuum pump is mounted on the side of an outlet, and then a compound-type dry vacuum pump is formed by connecting and integrating the rotary-vane vacuum pump and the scroll-type vacuum pump, having the advantages of high compression ratio, high vacuuming speed, low production cost and simplified structure, thus improving the working effectiveness and quality of pumps accordingly.

Abstract: The present invention has an object of offering a scroll fluid machine having a multi-stage compressing part which is characterized in that volumes of a sealed spaces is less scattering thereof corresponding to the given angle rotational amount of the revolving scroll driving shaft.

Abstract: A scroll vacuum pump includes a first stage having a first stage fixed plate with a spiral involute, a second stage having a second stage fixed plate with a spiral involute wrap, and an orbiting plate having upper and lower surfaces. An involute spiral extends from the orbiting plate bottom surface to define a first stage orbiting plate and a second involute spiral extends from the orbiting plate top surface to define a second stage orbiting plate. The first stage involute wraps are taller than the second stage involute wraps. Gas is expanded in the first stage and compressed in the second stage. The first stage has an expansion ratio greater than or equal to one and the second stage has a compression ratio greater than or equal to one. However, that the pressure at the second stage exit is less than the pressure at the first stage inlet.