Abstract: A scroll-type fluid machine such as a scroll compressor or a scroll vacuum pump generates compression heat during compressing operation. A scroll body comprises a stationary scroll and an orbiting scroll that is revolved with respect to the stationary scroll eccentrically. The stationary scroll has a stationary wrap and the orbiting scroll has an orbiting wrap engaged with the stationary wrap to form a compression chamber therebetween. In the scroll-type fluid machine, a cooler is provided to cool high-temperature compressed air discharged from a discharge bore at the center of the stationary scroll.

Abstract: A compressor has a compression unit, a drive motor, a motor housing and an outer cylinder. The compression unit compresses fluid. The drive motor drives the compression unit. The motor housing surrounds the drive motor. The outer cylinder is mounted on an outer circumferential side of the motor housing for defining a cooling jacket between the outer cylinder and the motor housing for cooling the drive motor by a refrigerant flowing in the cooling jacket. The outer cylinder is directly or indirectly fixed to the motor housing by fastening a plurality of bolts or by press-fitting.

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: An improved housing for scroll compressor has the end cap housing formed integrally with the fixed scroll member. The end cap housing is preferably welded to a tubular housing enclosing the scroll compressor. Most preferably, the end housing has inner and outer tubular portions and the tubular housing extends upwardly into a channel between the inner and outer tubular portions. A muffler is preferably formed integrally with the end cap and extends to a side of the end cap. The present invention further includes heat transfer fins extend from the end cap. The positioning of the muffler to the side decreases the overall length of the compressor. The use of the fins increases the efficiency of compression as heat is removed from the compression chambers. The use of the unique combined end cap and fixed scroll which is welded to the tubular housing simplifies assembly.

Abstract: A fluid machinery comprises a helical mechanism provided with a cylinder, a roller eccentrically disposed inside the cylinder and formed with a helical groove and a blade member fitted in the helical groove, an electric motor unit connected to the helical mechanism through a rotational shaft, the roller, which eccentrically rotates, having an engagement portion engaged with a crank portion of the rotational shaft, and a pair of bearings disposed to both axial end portions of the cylinder so as to support the rotational shaft. The engagement portion of the roller and the bearings are formed with through holes for ventilation, respectively.

Abstract: A compressor is composed of a pair of rotors engaging with each other and a driving mechanism having plural gears for driving the pair of rotors. The pair of rotors is disposed in a rotor chamber and the driving mechanism in a gear chamber, both chambers being separated by a separating wall. Fluid such as air is introduced into the rotor chamber from an inlet port and compressed therein, and the compressed air is delivered through an outlet port formed at a position close to the driving mechanism. A cooling water passage is formed at a bottom portion of the gear housing to cool lubricant encapsulated in a gear chamber. Additional cooling water passages may be made to further cool the components of the compressor.

Abstract: A scroll-type compressor 1 of the present invention comprises a fixed scroll 30, a movable scroll 51 which orbits so that it slides along the fixed scroll 30, draws, and compresses gas, and a housing 3 which includes a discharge port 6 from which the gas compressed by the movable scroll 51 is discharged; wherein a cooling fin 35, which directly contacts at least a part of the compressed gas, receives heat from the compressed gas, and reduces the temperature of the compressed gas, is included inside the discharge port 6. In the scroll-type compressor in the present invention the cooling fin is provided in the discharge port. When the cooling fin is provided in the discharge port, and not around the discharge port, the discharge gas of high temperature directly contacts the cooling fin, so that the cooling efficiency of the compressor is improved.

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 rotary screw type pump is provided with internal cavities within the rotors. The rotors include shaft portions that extend out from the casing that contains the screw portion of the rotors. The cavities extend from the screw portion of the rotors at the compression side of the casing to the shaft portion of the rotors. The cavities are charged with a fluid and may include a porous wick in order to act similar to a heat pipe for removing the heat generated during pump compression. The heat is transferred to the shaft portion of the rotors. The shaft portion of the rotors extend into a cavity that contains a coolant. A water jacket surrounds the cavity. The heat is transferred from the shaft portion of the rotors to the coolant and then the water jacket for removal. The heat transfer from the shaft portions to the coolant may be facilitated with the use of fins.

Abstract: A scroll compressor comprising paired fixed and movable scrolls, the fixed scroll of each pair having an end plate provided with a scroll body projecting from the end plate and the movable scroll of each pair having an end plate provided with a scroll body projecting from the end plate, wherein the movable scroll meshes with the fixed scroll to form a plurality of operation chambers between them and revolves relative to the fixed scroll to compress gas in the operation chambers is characterized in that two pairs of fixed and movable scrolls are disposed with back faces of the end plates of the fixed scrolls opposite each other, the movable scrolls are integrally connected with each other, a main shaft for revolving the movable scrolls passes through the two pairs of fixed and movable scrolls to operatively engage the movable scrolls, and an outlet chamber is disposed between the end plates of the fixed scrolls.

Abstract: The invention concerns a cooling device wherein the chamber (2) represents cooling channels arranged in the thickness of the pump cylinder walls. The steam flux (7) generated by the heat to be evacuated reaches the upper end of the condenser (1) and comes out in the form of water in the return branch (6) into the chamber (2). An air flow (5) driven by the fan (3) activates condensation. The sensor (17) acts as a control and safety element.

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: An improved housing for scroll compressor has the end cap housing formed integrally with the fixed scroll member. The end cap housing is preferably welded to a tubular housing enclosing the scroll compressor. Most preferably, the end housing has inner and outer tubular portions and the tubular housing extends upwardly into a channel between the inner and outer tubular portions. A muffler is preferably formed integrally with the end cap and extends to a side of the end cap. The present invention further includes heat transfer fins extend from the end cap. The positioning of the muffler to the side decreases the overall length of the compressor. The use of the fins increases the efficiency of compression as heat is removed from the compression chambers. The use of the unique combined end cap and fixed scroll which is welded to the tubular housing simplifies assembly.

Abstract: A scroll compressor comprising paired fixed and movable scrolls, the fixed scroll of each pair having an end plate provided with a scroll body projecting from the end plate and the movable scroll of each pair having an end plate provided with a scroll body projecting from the end plate, wherein the movable scroll meshes with the fixed scroll to form a plurality of operation chambers between them and revolves relative to the fixed scroll to compress gas in the operation chambers is characterized in that two pairs of fixed and movable scrolls are disposed with back faces of the end plates of the fixed scrolls opposite each other, the movable scrolls are integrally connected with each other, a main shaft for revolving the movable scrolls passes through the two pairs of fixed and movable scrolls to operatively engage the movable scrolls, and an outlet chamber is disposed between the end plates of the fixed scrolls.

Abstract: The invention relates to a spin pump for conveying a liquid polymer melt. To drive the conveying means enclosed in the pump housing, a drive shaft is provided, which extends through the pump housing in a bearing bore, and which comprises an external end for connecting to a drive. To seal the outward extending drive shaft, a cooling sleeve is employed which connects in a pressure tight fashion to the pump housing. The cooling sleeve surrounds the drive shaft with a narrow gap therebetween, and the outer surface of the cooling sleeve is cooled by a coolant for increasing the viscosity of the polymer melt which enters the gap between the drive shaft and the cooling sleeve. With an increased viscosity, the melt acts to seal the gap without interfering with the rotation of the drive shaft.

Abstract: The scroll pump has the capability of preserving a minimal play between the joints disposed on the ridges of each of the spiraling walls and the flat wall facing it. Such an arrangement, possible owing to the slight difference in pressure prevailing between two adjacent transfer chambers, makes it possible to prevent wear and tear on the joints, soiling of the transfer chambers as well as overheating due to friction on the joints.

Abstract: An air-cooled shaft seal comprises an annular body having an inner surface and an outer surface. One or more helical channels are formed on the inner surface. A plurality of external surfaces such as radial fins are disposed in axially spaced relationship on the outer surface, and extend radially in a direction away from a longitudinal axis of the annular body. The external surfaces present a substantially increased surface area through which heat energy is transferred from polymeric material contained in the seal to the atmosphere. The seal may be installed on one or shafts of a gear pump for transporting a viscous material under pressure.

Abstract: A rotary fluid machine, such as a pump or motor, is provided with a fluid flow control mechanism that allows the flow of fluid to be easily and precisely controlled. The device has a housing with a spherical interior in which primary and secondary vanes rotate, with the secondary vane reciprocating between open and closed positions. The primary and secondary vanes define fluid chambers within the housing that communicate with inlet and outlet ports of the device. An adjustable fixed shaft, about which the secondary vane rotates, allows the degree of communication to be varied between the inlet and outlet ports and the chambers formed by the primary and secondary vanes. In this way, the flow rate or fluid capacity of the device, and even the direction of fluid flow, can be changed.

Abstract: A cooling fan is fitted to one of the shaft end portions of a double-end motor, and a pulley is fitted to the other end portion. A belt is passed around this pulley and a pulley fitted to a compressor element, and the compressor element is driven by this belt. The compressor element is disposed in such a manner as to be stacked up in an upward direction of the motor. An exhaust duct having a built-in cooler is also disposed in such a manner as to be stacked up above a cooling fan on the discharge side of the cooling fan. A main duct is formed on the suction side of the cooling fan and is interconnected in series with a cooling air outlet of the compressor element. These members described above are accommodated inside a casing. Therefore, two cooling air flow passages are defined on the right and left sides inside the casing.

Abstract: It is an improvement of a package-type compressor that is used for the air compression, refrigerating and air conditioning. The compressor is a double scroll compressor that a laps are formed on both sides of an end plate of orbiting scroll. A scroll compressor element is disposed above a motor and a dryer is disposed further above the scroll compressor element. A cooling fan is installed in the motor. A cooler that cools operation gas through the compressor element is disposed above the cooling fan. A partition plate defines a first flow passage for cooling the motor and the compressor element and a second flow passage for cooling the cooler. A first suction port sucking external air to the first and second flow passages is provided on a casing side wall locating in a direction extending from the motor shaft. A suction partitioning plate is attached to a casing side wall opposite to the casing side wall having the first suction port. The second suction port is lower than the first suction port.

Abstract: The present invention is to offer a scroll fluid machine of which the scroll machine proper is cooled sufficiently and effectively and characterized in that, a tubular jacket 26 is provided, said tubular jacket surrounds the outer circumferential surface of a motor 15(motor housing 13) keeping some distance from said surface and has an annular opening 17a on said motor facing to said scroll machine proper side, from which opening cooling gas induced by a cooling fan 16 is taken in, and a passage 19 connecting to the cooling space 17 formed by said outer circumferential surface of the motor and said tubular jacket is provided to guide and introduce said taken-in cooling gas to said scroll machine proper in the direction crossing the longitudinal direction of the rotation shaft of said motor. Thus, the back side of the scroll disk of said scroll machine proper is cooled by the cooling gas flowing in one direction behind the scroll disk.

Abstract: A scroll fluid machine is disclosed, which comprises a stationary scroll with an embedded wrap which is spiral in form, extending from a central part of a scroll body toward the outer periphery thereof, and a revolving scroll with an embedded spiral wrap engaging with said spiral wrap, the said revolving scroll having a scroll body coupled to a drive shaft 11A coupled to a drive at the central portion thereof. The drive shaft 11A is cooled directly by cooing means provided inside it. The scroll body of the revolving scroll has a central part coupled to a drive. Heat generated in a process, in which fluid sucked from the scroll edge is led to the central part while being progressively compressed, can be removed at the central part which is elevated to a highest temperature, thus permitting efficient cooling of bearings and seal members near the revolving scroll central part and the drive shaft.

Abstract: A scroll mounting member for mounting a drive scroll therein is secured to the left end of a drive shaft coupled to a motor. A rotary bearing is fitted on the outer periphery of the scroll mounting member, and its outer periphery is secured to a scroll housing. The scroll mounting member is disposed for rotation in the scroll housing and is secured to the drive shaft. A bearing retainer for holding the rotary bearing is mounted by bolts via a spring in a mounting portion of the scroll housing. The rotary bearing is adjustable in the thrust direction at the scroll housing. By turning bolts, the rotary bearing is either advanced in the thrust direction via the bearing retainer or retreated, via the bearing retainer and a spring, which, together with the bolts, form an adjusting device. A self-lubricating sleeve seal is axially slidably fitted in an end portion of a driven scroll mounting member.

Abstract: An air-cooled shaft seal comprises an annular body having an inner surface and an outer surface. One or more helical channels are formed on the inner surface. A plurality of external surfaces such as radial fins are disposed in axially spaced relationship on the outer surface, and extend radially in a direction away from a longitudinal axis of the annular body. The external surfaces present a substantially increased surface area through which heat energy is transferred from polymeric material contained in the seal to the atmosphere. The seal may be installed on one or shafts of a gear pump for transporting a viscous material under pressure.

Abstract: An improved housing for scroll compressor has the end cap housing formed integrally with the fixed scroll member. The end cap housing is preferably welded to a tubular housing enclosing the scroll compressor. Most preferably, the end housing has inner and outer tubular portions and the tubular housing extends upwardly into a channel between the inner and outer tubular portions. A muffler is preferably formed integrally with the end cap and extends to a side of the end cap. The present invention further includes heat transfer fins extending from the end cap. The positioning of the muffler to the side decreases the overall length of the compressor. The use of the fins increases the efficiency of compression as heat is removed from the compression chambers. The use of the unique combined end cap and fixed scroll which is welded to the tubular housing simplifies assembly.

Abstract: A scroll fluid machine is disclosed, which comprises a stationary scroll with an embedded wrap which is spiral in form, extending from a central part of a scroll body toward the outer periphery thereof, and a revolving scroll with an embedded spiral wrap engaging with said spiral wrap, the said revolving scroll having a scroll body coupled to a drive shaft 11A coupled to a drive at the central portion thereof. The drive shaft 11A is cooled directly by cooing means provided inside it. The scroll body of the revolving scroll has a central part coupled to a drive. Heat generated in a process, in which fluid sucked from the scroll edge is led to the central part while being progressively compressed, can be removed at the central part which is elevated to a highest temperature, thus permitting efficient cooling of bearings and seal members near the revolving scroll central part and the drive shaft.

Abstract: A scroll-type fluid displacement machine includes first and second scroll bodies that rotate synchronously together, their rotation axes being offset from one another. A cylindrical partition wall is provided to extend axially in the center of the scroll bodies. A space is provided between scroll vanes of the scroll bodies and the cylindrical partition wall. The interior of the cylindrical partition wall is cooled by air ventilation, and a grease-lubricated Oldham coupling is disposed inside the cylindrical partition wall. Hence, the Oldham coupling that is made of a metal is prevented from wear and deformation thereof over a long time. The displacement machine requires neither a counterweight nor a pin-crank device. The machine may be oil-free in the fluid compression part of the scroll bodies.

Abstract: A preferably totally oil-free spiral compressor (1) with a high suction volume flows and a high compression ratio, is useful in particular to generate compressed air for rail vehicles. The compressor includes two spirals arranged on one side only, and includes measures to exactly guide both spirals relative to each other. For that purpose, a compression crown (15) is connected to and axially spaced from a first one of the spirals (7), and the second spiral (9) is positively guidedly driven within the compression crown (15) by a positive guidance arrangement. The positive guidance arrangement includes support rollers (17) that extend axially from the second spiral toward the compression crown and that are engaged and constrained to roll in bores (19) let into the compression crown (15) and shaped as guiding rings.

Abstract: In a totally oil-free spiral compressor (1) with high suction volume flows and compression ratio, useful in particular to generate compressed air for rail vehicles, the spirals are arranged on one side only and measures are taken to compensate for the high axial forces that act on the spiral bearings. Compression chambers (35) arranged with an axial gap between the spirals (7, 9) of the spiral compressor (1) are fed by compression pockets (45) and support the nested spirals against each other. The compression chambers (35) are preferably arranged between a compression crown (15) joined to the driving spiral (7) and a ring wheel (37) of the forcibly driven second spiral (9), so that axial counterforces compensate for the axial forces that act upon the bearings (29, 33) of both spirals.

Abstract: An oilless gas compressor includes a motor containment vessel containing a motor for driving the compressor and a crankcase attached to the motor containment vessel. The crankcase and the motor containment vessel are fluidly connected and together define a sealed, pressurizable interior cavity in which the rotatable motor shaft is disposed. The compressor further includes a cylinder mounted upon the crankcase, the cylinder having a piston disposed therein. The piston is connected to the shaft for reciprocation of the piston within the cylinder. The cylinder also includes a gas intake valve, fluidly connected to the compressor suction inlet port, and a gas discharge valve, fluidly connected to the compressor discharge outlet port. The oilless gas compressor, in which the need for perimeter rotating shaft seals is obviated, is suitable for compression of precious or toxic gases or flammable gases, such as natural gas.

Abstract: A rotary-screw air compressor having a separator, a cooler fan assembly, and a mounting apparatus. The separator has a first chamber and a second chamber. The first chamber separates compressed air and coolant. The second chamber separates compressed air and moisture. The separator is disposed in a chasm formed by a first platform. The mounting apparatus elevates a motor and air end vertically above and spatially apart from the separator. A cooler fan assembly is vertically above the motor and air end. The cooler fan assembly has a first heat exchanger vertically above a second heat exchanger. A shroud having an opposite open end is connected to the first heat exchanger at one open end and the shroud is connected to the second heat exchanger at the other open end. A cooler fan is disposed completely within the shroud and between the first and second heat exchangers.

Abstract: An air flow system for circular rotary engines which provides external air intake for engine cooling and combustion chamber pressurization and faciliates increased fuel efficiency and performance for either air/fuel intake and pressured fuel injection engines. In a circular rotary engine having opposed piston rotors, exterior air is drawn into the engine through intake slots in the engine housing and is then internally pressured in opposite directions by the blades of a central separator fan toward the backside of piston rotor cooling vanes, then directed internally to impeller fans at opposite ends of the engine to increase the air flow pressure for combustion chamber injection and produce piston rotor by-pass air flow for surface cooling.

Abstract: A scroll fluid machine includes stationary scrolls, with embedded wraps which are spiral in form, extending from central parts of scroll bodies toward the outer peripheries thereof, and a revolving scroll, with an embedded spiral wrap, engaging with the spiral wraps. The revolving scroll has a scroll body coupled to a drive shaft coupled to a drive at the central portion thereof. The drive shaft is cooled directly by a cooling structure provided inside it. The scroll body of the revolving scroll has a central part coupled to a drive. Heat generated in a process, in which fluid sucked from the scroll edge is led to the central part while being progressively compressed, can be removed at the central part which is elevated to a highest temperature, thus permitting efficient cooling of bearings and seal members near the revolving scroll central part and the drive shaft.

Abstract: Spiral compressor which contains a housing (1) with the fixed spiral (2); a moving rotor (3) in this housing (1) with the moving spiral (4) working in conjunction with the fixed spiral (2); and a crankshaft (5) containing a main shaft (6) which is bearing-mounted in the housing (1) and which has a secondary shaft (9) situated eccentrically in relation to the geometric axis (11) of the main shaft (6) which is bearing-mounted in the rotor (3) by means of a bearing (14); whereby means (30-31-32) are provided to prevent the rotor (3) from rotating around its own center, such that the rotor (3) can only carry out a circular movement around the geometric axis (11) of the crankshaft (5) as this crankshaft (5) rotates, characterized in that the rotor (3) is provided with an oil chamber (20) which is connected to the bearing (14) between the secondary shaft (9) and the rotor (3).

Abstract: A scroll fluid machine includes a fixed scroll member having an end plate which is formed such that a central portion of the end plate which corresponds approximately to 1.5 to 2 turns of a wrap portion from its spiral starting end (innermost end) is a thick-walled portion having a relatively large plate thickness, and an outer peripheral portion of the end plate which lies radially outside the thick-walled portion is a thin-walled portion. The thickness of the thick-walled portion is set to be about 1.4 to 1.6 times the thickness of the thin-walled portion. By reducing thermal resistance at the thick-walled portion of the end plate, heat from compression chambers are conducted to radiating fins, thereby suppressing the transfer of the heat to the thin-walled portion.

Abstract: A scroll compressor includes a drive shaft and an auxiliary drive shaft which are rotatably supported by stationary scrolls, and an orbiting scroll rotatably supported on these drive shafts through cranks. A resilient member is provided on the crank so as to allow thermal expansion of the orbiting scroll in a direction, along which the drive shafts are lined. With this construction, a distance between bearings for the orbiting scroll and the stationary scrolls is adjusted in accordance with the thermal expansion, and therefore even when the thermal expansion occurs, a smooth motion of the scroll will not be affected.

Abstract: An end plate 3a of an orbiting scroll 3 of an oil-less scroll compressor is provided with cooling holes 7 passing from the periphery of the revolving scroll through the central portion thereof. Using a pressure difference of about 100 mmAq between the ends of the cooling holes 7, the scroll compressor's own intake air is passed through the cooling holes to directly cool the revolving scroll.

Abstract: A double scroll compressor includes left and right stationary scroll members 2, 3 which are located by knock pins 20. Setting of positions of the right stationary scroll member 3 and an orbiting scroll member 1 relative to each other is achieved by using knock pins 16 to 19. A crankshaft 4 and an auxiliary crankshaft 5 are drivingly coupled through a timing belt under such a condition that their cranks have been in synchronization with a position of their maximum radius.

Abstract: An air-cooled vane-cell compressor is provided which has a housing, a bore hole therethrough and an outer surface. Cooling air fins are arranged on the housing surface in a longitudinal direction of the housing. A rotor which has two free shaft ends is arranged within the housing eccentric to the housing bore. Covers are arranged on front faces of the housing and the rotor shaft ends are rotatably supported in the covers. A suction flange and an ejection flange are arranged in the housing at 90.degree. to the covers and along a common longitudinal axis. The rotor has a rotational axis that is symmetrically arranged to the outer contour of the housing and to the flanges, and the housing bore is doubly eccentric to the rotational axis of the rotor in a top dead center direction.

Abstract: An air-cooled oil-free rotary-type compressor in accordance with the invention includes a first air cooler including a plurality of cooling pipes, a check valve, and a second air cooler. The first air cooler, the check valve and the second air cooler are provided in a passage of compressed air discharged from a compressor body. The second air cooler is disposed in a first cooling air flow direction and the second air cooler is disposed in a second cooling air flow direction substantially perpendicular to the first cooling air flow direction. The plurality of cooling pipes of the first air cooler are arranged along the second cooling air flow direction.

Abstract: An apparatus provides air cooling for a scroll compressor having a fixed scroll and an orbiting scroll. A plurality of fins are fixedly attached on a back surface portion of the fixed scroll. A cover assembly is disposed on the fins of the fixed scroll. The cover assembly and the fins of the fixed scroll form air passageways between the plurality of fins. A plurality of arcuately shaped fins are fixedly attached on a back surface portion of the orbiting scroll. A cover assembly is disposed on the fins of the orbiting scroll. The cover assembly and the fins of the orbiting scroll form air passageways between the plurality of fins. A shroud assembly surrounds the fixed and orbiting scrolls. The shroud assembly defines an interior portion around the fixed and orbiting scrolls, an intake aperture and a plurality of exhaust apertures. The shroud assembly has an exterior surface portion having a plurality of involutes formed thereon.

Abstract: A pump comprises a pump casing having a pump channel, a pump element rotating in the pump channel, and a rotor shaft mounted in the pump casing and attached to the pump element. The pump element has a cylindrical outer periphery, and undulating surfaces in the axial direction. The opening in the casing which receives the rotor shaft has an annular groove in which there is disposed a spring loaded sealing element which bears slidably against a flat end face of the pump element when the pump element rotates. The sealing element is subjected to the pressure of superheated steam which is conducted to the sealing element via pressure channels in the pump casing connected to the annular groove. The rotor shaft includes radial and axial channels through which a coolant flows.

Abstract: A rotating spiral pump comprises a housing in which two displacement disks are rotatably disposed. The two displacement disks are provided on one side with ribs that extend in spiral fashion and interlock for the purpose of forming pumping chambers, and seal against the opposite displacement disk with their free face ends. The spirally extending ribs are embodied in several steps. The plurality of steps are spatially separated from each other by the formation of an space, and the radially outer step has at least twice as many pumping chambers as the radially inner step. Cooling means in the form of cooling ribs are preferably provided in the space, between the outlet of the radially outer step and the inlet of the radially inner step.

Abstract: The rotary compressor is constructed such that two oil cooler pipes are arranged in the vicinity of two compressing elements located at the opposite ends of an electrically driving element. With this construction, cooling performances of the rotary compressor can be doubled. In addition, since the two oil cooler pipes and two heat exchangers are connected to each other in series, there does not arise a necessity for enlarging a volume of the rotary compressor by increasing a diameter of the same. Alternatively, the rotary compressor may include a cooler pipe for conducting refrigerant to an oil cooler pipe and a fan for simultaneously forcibly cooling an enclosed vessel and the cooler pipe. In this case, since the temperature of refrigerant gas to flow into the oil cooler pipe can be lowered, the lubricant can be cooled at a high efficiency.

Abstract: In an epitrochoidal rotary air compressor, a stationary portion includes a stationary single offset power shaft on which is mounted an epitrochoidal rotor in a rotary housing portion. The rotor includes a pinion gear which cooperates with a ring gear in the rotary housing portion to move the rotor within the rotor chamber in the rotary housing portion. A centrifugally driven lubrication system including lubrication channels extending internally of the stationary power shaft is provided for lubricated bearings and gears within the apparatus. An improved compression seal engaging the lateral faces of the rotor has a plurality of buttons biasing a split ring against the lateral faces of the rotor. An air pressure unloader valve is centrifugally operated to release the load from the compressor during startup. A rotary after-cooler in the rotary housing portion removes thermal energy from the compressed air prior to leaving the compressor and an inter-cooler may be provided in a two stage compressor.

Abstract: An air-cooled oil-free rotary-type compressor comprises a first air cooling-type air cooler, a backflow preventing valve and a second air cooling-type air cooler respectively disposed in a channel of a discharge gas compressed in a compressor body. The first air cooling-type air cooler and the second air cooling-type air cooler are disposed in a passage of cooling air flow.

Abstract: The engagement parts of the external rotor of a single rotation are provided with at least one cooling air duct. The inflow takes place by an inflow duct provided in the casing side plate and which is surrounded by the antifriction bearing mounting the external rotor, while the outflow takes place radially through openings provided in the circumferential wall of the casing.

Abstract: An oilless rotary compressor system including an oilless rotary compressor, a radiator, a precooler, a cooler and a check valve. Heat resulting from a compression by the oilless rotary compressor is carried to the radiator through an aqueous solution of propylene glycol which flows through the oilless rotary compressor and precooler in this order and is dispersed into the atmosphere.

Abstract: In a rotary-piston displacement machine, as is suitable, for example, for supercharging internal combustion engines, having at least two spiral-like delivery chambers in a stationary housing and spiral-like displacers engaging therein which execute a circulating, torsion-free movement with respect to the delivery chambers, the displacers are arranged on an eccentrically driven, disk-shaped rotor. The rotor is driven via a shaft centrally arranged in the inside of the housing. The two spirals run centro-symmetrically to one another in such a way that their suction-side ends are arranged around the drive bearings and at the same time cool the latter with fresh air. The air is delivered outwards from the inside of the housing, as a result of which heat dissipation of the outer housing parts during compression is provided for, which housing parts are provided with cooling ribs.

Abstract: A rotary compressor housing is outwardly formed with reinforcing grids in the form of square, diaper or honeycomb. The reinforcing grids allow the intermediate wall portions between the bolted wall portions to thermally expand as much as the bolted wall portions, resulting in that the inner periphery of the center housing always keep its circularity when the inner temperature rises due to an unavoidable compression of air.