Abstract: A lubricating device for a horizontal type rotary compressor having an oil pumping chamber formed under the vane in the compression cylinder. The oil pumping chamber is provided in the compression cylinder under the vane and has an oil inlet port and an oil outlet port provided on at least one of its side walls. An oil piston is received in the pumping chamber such that it elastically vertically reciprocates in the pumping chamber in accordance with vertical reciprocation of the vane. The piston is biased upwards at the outside of the pumping chamber by a steel wire spring which is connected at one end thereof to the oil piston and at the other end thereof to one of the compression cylinder, the main bearing and the sub bearing. An oil feed pipe is connected between the oil outlet port of the pumping chamber and an oil conduit of the eccentric rotating shaft. A hydraulic diode, of which the upper diameter is not smaller than the lower diameter, may be axially formed in the oil piston.

Abstract: A hermetic compressor for compressing the refrigerant in such a refrigerating systems as in refrigerators, freezers, air conditioners and the like, has a sliding part slidably inserted in one end of a hollow shaft, the hollow shaft is adapted to have a tantgential contact with a pumping cylinder, wherein the rotation of the sliding part according to the rotation of the shaft while the sliding part maintains contact with inside of the pumping cylinder allows to draw in and push out oil inside of the cylinder through a lubrication oil guide, the hollow of the shaft and discharge holes on the shaft to feed to each lubrication parts.

Abstract: A lubrication system for a scroll machine which, to any extent desired, can utilize the centrifugal forces generated by the orbiting of the orbiting scroll member to influence, either positively or negatively, the flow of fluid in a portion of the lubricant system. This fluid can be either a lubricating oil fed to the thrust bearing for normal lubrication, an oil injection into the intermeshed scrolls to increase sealing and efficiency while attenuating noise, or a venting of vapor from some point in the lubrication system.

Abstract: The space in a closed container is divided into two parts by a partition wall member, gas jetting holes through which a high pressure gas released from a compression mechanism section is passed are formed in the partition wall member and a gas collision plate is disposed in opposed relation to the gas jetting holes, and therefore, there is provided a compressor of high achievement factor which is capable of preventing the discharge of oil from the compressor to a refrigerating cycle from being increased even if operated at high rotational frequency.

Abstract: A scroll machine has a cover plate attached to the lower bearing housing which is adjacent the lower motor windings of the scroll machine. The cover plate has a plurality of grooves which work in conjunction with a lower counterweight of the scroll machine to circulate the lubricating oil located in the sump around the lower motor winding to cool the motor.

Abstract: An oil pump for a closed type compressor of the present invention is mounted in the inside bottom of a closed housing. In the oil pump, a rotor is driven to revolve by an eccentric shaft formed at the lower end of a rotary shaft for driving a compressing mechanism while the rotor is formed with a projection which is inserted into a slot of a cylinder chamber in order to inhibit the rotation of the rotor. In this arrangement, the root of the projection is cut away so that the projection is prevented from interfering with angled portions of an opening of the slot.

Abstract: A scroll compressor oil pumping system has a concentric axial bore located in the driveshaft of the compressor which serves as the primary oil pump. The driveshaft is journaled in a lower bearing housing and is located within the oil sump of the compressor. An inlet housing is attached to the lower bearing housing and creates a stepped flow path for the oil between the sump and the oil pump. The inlet housing may also be equipped with a plurality of air foil shaped vanes to impede the formation of a bottom vortex. The stepped flow path causes an annular vortex to form which operates to separate the contaminants from the lubricating oil. In order to assist in the formation of the annular vortex, the driveshaft can include an impeller. The contaminants are channelled into a holding chamber formed by the lower bearing housing and the inlet housing. A plurality of funnel shaped orifices guide the contaminants into the chamber and operate to resist blow out of the debris during liquid flashing conditions.

Abstract: A scroll compressor oil circulation system has the usual concentric bore oil pump which supplies lubricating oil to a chamber within which an impeller rotates. The rotating of the impeller within this chamber pumps lubricating oil through a passage which communicates with a control passage which injects a quantity of lubricant into the compression chambers of the scrolls for cooling and lubrication. The amount of oil injected into the compression chamber is controlled by the shape of the control passage through the orbiting scroll.

Abstract: A compressor assembly for pumping a recirculating refrigerant including input and output shafts rotatably supported within a housing and a pressure responsive clutch disposed therebetween for selectively translating torque from the input shaft to the output shaft to drive the compressor. An auxiliary clutch compressor is employed for generating an auxiliary refrigerant discharge pressure and a control valve is moveable between first and second positions to either route refrigerant discharge pressure away from the clutch or to bear upon the clutch so as to translate torque between the input and output shafts.

Abstract: The present invention relates to a horizontal hermetic compressor comprising an oil reservoir 9 which is installed in a closed housing to store the lubricating oil discharged from an oil pump 51, and an oil supply pipe which connects an oil supply hole 52 to the oil reservoir 9. The opening of an oil suction pipe 56 of the oil pump 51 is positioned below the upper limit oil level height H.sub.1 of the lubricating oil 57 stored at the inner bottom of the closed housing 8.

Abstract: A rotary machine, such as a horizontally oriented scroll type refrigerant compressor is disclosed. The compressor includes a compressor housing, an inner block fixedly disposed within the compressor housing, a drive shaft extending substantially in the horizontal direction, and a driven mechanism, such as a compression mechanism operatively connected to one end of the drive shaft. The drive shaft is rotatably supported by the inner block and the compressor housing. A shielding element, such as an annular cylindrical member is fixedly held between the inner block and the compressor housing to prevent the drive shaft from passing through an oil sump of the housing. An internal lubrication oil pump is formed by the elements which are associated with the drive shaft, and is operated by virtue of the rotational motion of the drive shaft in order to supply the lubrication oil from the oil sump to the frictional surfaces of the internal component parts of the compressor.

Abstract: There is provided a fluid compressor having a horizontal rotation axis. An oil reservoir for a lubrication oil is provided within a sealed casing. A cylinder having both end opening portions rotatably supported by bearings is housed within the casing. A rotor piston is eccentrically supported within the cylinder. A helical blade is wound around the outer periphery of the piston such that it can project from and retreat in the outer periphery of the piston. The cylinder and the piston are coupled by an Oldham mechanism. A gas is taken in a compression chamber defined by the cylinder, piston and blade, and it is compressed. The compressor is provided with a pump member, e.g. a trochoid pump, actuated by the rotation of the piston. The lubrication oil is sucked from the oil reservoir and supplied to slide portions.

Abstract: The present invention relates to an apparatus for producing a controllable, uniform conveying pressure for processing highly viscous, temperature sensitive rubber or thermoplastics, consisting of two rotating conveying elements that form a toothlike sealing profile and are arranged on shafts in a housing. The root diameter of the conveying elements more or less corresponds to the diameter of the shaft sections that are axially adjacent to the conveying elements on either side and form bearing surface therefor. The radial faces of the conveying elements are thus avoided and so are the usually rather difficult sealing problems at these faces. By additionally providing either the shaft sections or the surrounding housing parts with return channels the channel volume of which decreases in the conveying direction, the axial sealing capacity of the gear pump is improved considerably.

Abstract: An inexpensive, efficient pump which can supply lubricating oil uses the revolving motion of an orbiting scroll 2. The pump is so constructed that a piston supported by a fixing member 1 is fitted in a cylinder chamber 102 formed in the inner surface of the end plate 21 of an orbiting scroll 2 which revolves while sliding on the fixing member, by which a pump chamber 104 is defined between them. The piston 101 is extended or retracted depending on the revolving motion of orbiting scroll 2, the volume of the pump chamber 104 is increased or decreased, and a fluid suction port 105 and a fluid discharge port 106 are connected to the pump chamber 104 at predetermined time intervals to supply the fluid.

Abstract: A plurality of vane chambers on the back side of vanes are caused to function as pump chambers using the reciprocating movement of the vanes to pressure-feed a lubricating oil to a compressor mechanism unit. A taper hole at one of the vane chambers for drawing the lubricating oil, a hole on another chamber for mitigating back pressure and a taper hole between the chambers are provided to improve the pressure feeding capability. In addition, the lubricating oil having been supplied to the compressor mechanism unit is supplied to the slide surfaces of crank portions from an oil hole of each crank portion through an oil passage at the center of the rotating shaft and is further distributed optimally to slide bearing portions by oil guide grooves.

Abstract: An air-cooled oil-free screw compressor is provided with a first lubricating oil circulating flowpassage 1 which extends from an oil tank 20 via an oil pump 21 and an air heat exchanger 22 to cooling jackets 15 and 16 for cooling compressor bodies 12 and 13. A second such passage is connected between the cooling jackets and the oil tank and includes an oil filter 23, lubricating oil.

Abstract: A scroll compressor includes a discharge oil reservoir chamber that is subjected to a discharge pressure, a bearing oil supply passage for supplying and returning the lubricating oil to the main bearing and a revolving bearing by a viscosity pump; and an oil injection passage having a throttle passage which supplies part of the lubricating oil supplied to at least one of the bearings to compression chambers, thereby lubricating the bearing sliding surfaces supporting most of the compression load so as to reduce wear and frictional resistance.

Abstract: A bearing and lubrication system for a sealed, integrated motor driven co-rotating scroll refrigerant compressor includes hydrostatic bearings and an independent motor driven lubricant supply pump for supplying lubricant to the hydrostatic bearings mounting in the housing. The housing is divided into a high-pressure section that receives compressed refrigerant and a low pressure section containing the involute scroll compressor wraps. Individual lubricant supply sumps are provided in the high and lower pressure housing sections for supplying lubricant to the compressor bearings. The lubricant pump is capable of drawing lubricant from one or both of the lubricant supply sumps. A lubricant level sensor associated with one of the low or high pressure housing sumps is provided to maintain a desired level of lubricant therein. The lubricant supply pump is controlled so that pressure is supplied to the hydrostatic bearings during compressor operation.

Abstract: An oil injection type screw compressor includes an oil passage for circulating lubricating oil extending from an oil separator disposed in a discharge passage of a compressor main body through an oil cooler, oil filter and oil pump on the downstream side of the oil pump to parts requiring lubricating oil such as rotors, bearings, shaft sealing members within the compressor main body, the compressor comprising pressure switches for detecting a pressure of a suction passage as a low pressure side, and a pressure of the oil passage between the oil filter and the oil pump as a high pressure side, whereby starting the oil pump when the differential pressure between both the detected pressures is not more than the specified value.

Abstract: A scroll-type fluid apparatus includes a housing whose interior is divided by upper and lower partitioning walls into chambers one over another, i.e., a discharge chamber communicating with a discharge port, an inlet chamber communicating with an inlet port and a drive chamber accommodating therein a motor. A first scroll member is disposed in the inlet chamber and has a lower surface formed integral with a first spiral scroll vane. A second scroll member is disposed in the inlet chamber at a location below the first scroll member and has a lower surface provided with a rotatable shaft which is rotatably supported in the lower partitioning wall. The second scroll member is integrally provided on an upper surface thereof with a second spiral scroll vane which is in mesh with the first scroll vane to form a plurality of variable-volume chambers. An oil pump is provided in the discharge chamber for supplying lubricant to contacting parts of the first and second scroll members.

Abstract: Bearing lubrication in a scroll compressor can be reliably effected at a sufficient flow rate independently of the flow rate of the lubricating oil supplied to the compression chambers 14 through the provision of a rotary-type displacement oil pump having a pump ring 25 which is adapted to orbit by the movement of the orbiting drive shaft 16. In addition, a lubricating oil sump and an oil intake passage communicating therewith are provided in close vicinity to the compression mechanism 2, thereby making it possible to operate the compressor without involving any backward flow of refrigerant gas in the oil feeding passage over a wide range of operating speed.

Abstract: There is disclosed a scroll-type machine particularly suited for use as a refrigerant compressor and incorporating an improved lubrication system for the drive.

Abstract: A pumping apparatus for pumping a gas having application to helium leak detectors has a vane and oil-seal type vacuum pump immersed in a closed tank (9) partially filled with oil (10). The apparatus also includes an oil pump (20) for renewing the oil seal located inside the tank. The oil pump is equipped with a noise-reducing mixing device enabling the oil for constituting the oil seal to be mixed with a noise-reducing gas. The noise-reducing gas is fed from the outside of the tank to the mixing device by means of a pipe (24) passing through the wall of the tank and opening via a Venturi tube to the suction duct of the immersed oil pump.

Abstract: An improved lubrication system for a refrigeration compressor is disclosed which lubrication system incorporates filtering arrangement for filtering lubricant supplied to a two stage lubricant pump and unique venting arrangement for venting gaseous refrigerant entrained within the lubricant. The two stage pump incorporates a vent passage in the first stage portion thereof which aids in avoiding a possible interruption of lubricant flow due to gaseous refrigerant within the first stage. A second radially extending restricted vent passage is provided in the drive shaft intermediate the ends thereof which is also designed to vent gaseous refrigerant while resisting the flow of lubricant therethrough so as to avoid priming thereof which could enable the passage to begin pumping lubricant.

Abstract: In a co-rotational scroll apparatus having two interleaving scroll wraps secured to end plates rotating about parallel, non-concentric axes to produce a relative orbital motion, a means for providing positive lubricant flow through the scroll wraps. A sump is provided adjacent the idler scroll member for supplying lubricant to a lubricant pump disposed in the lower end of the shaft of one scroll member. A lubricant gallery is provided in the scroll shaft for receiving the lubricant from the pump and directing the lubricant through passages in the scroll shaft to lubricate the scroll shaft bearing and for directing lubricant to passages in the end plate of the scroll member to be discharged adjacent the outer ends of the scroll wraps into the alternatively open and closed first chamber formed by the scroll wraps.

Abstract: An arrangement of a cooling medium pump of a rotary piston internal combustion engine of trochoidal-type of construction with a fluid or liquid cooled housing, with which the cooling medium is conveyed first in common and parallel through cooling hollow chambers of the casing mantle part and of a side part in a common hollow chamber and from there is conveyed by way of a cooling medium pump into another side part and from there via a thermostat into a cooler arranged on the other side part and from there it is returned into the cooling medium circulation in the housing. The cooling medium pump is arranged in the casing mantle part and a propeller or impeller thereof is arranged in a cooling hollow chamber of the other side part. A speed of rotation control regulator is arranged on a shaft of the cooling medium pump for fresh air supply and a lubricating oil pump also can be arranged on a butt end of this shaft.

Abstract: A horizontal rotary compressor comprises a sealed shell having a lubricating oil accumulated at a lower part therein; a drive unit included in the sealed shell; a compression unit included in the sealed shell and driven by the drive unit through a crankshaft; the crankshaft having a lubricating oil feeding hole formed therein; a lubricating oil pump for supplying the lubricating oil to the crankshaft to lubricate the compression unit; a discharge muffler which is arranged at the end of the compression unit remote from the drive unit, and which is provided with a lubricating oil passage; the lubricating oil passage having one end opened in the lubricating oil and the other end opened at the lubricating oil feeding hole; and a discharge refrigerant gas passage which is formed to be upwardly inclined in the discharge muffler so as to communicate from the space in the discharge muffler to the lubricating oil feeding passage.

Abstract: A gas removable pump for liquid comprising a housing having an inlet for introducing the liquid thereinto and an outlet for feeding the liquid therefrom, a drive shaft extending into the housing and having formed therein an axial bore, a rotary pump disposed within the housing, and a discharging chamber defined within the housing and separated from the rotary pump in a liquid-tight manner. The rotary pump includes a rotor secured to the drive shaft for co-rotation therewith and a plurality of cells for feeding the liquid, each cell constituting a separator for gas-rich liquid upon rotation of the rotor. A stationary shaft extends in the axial bore between the rotary pump and the discharging chamber. A connecting arrangement is provided in the drive shaft and stationary shaft for selectively connecting each cell with the discharging chamber. Also provided is an injector for ejecting into the discharging chamber the gas-rich liquid separated in the cells through the connecting arrangement.

Abstract: A refrigeration motor compressor assembly has a housing including a lubricant sump in the bottom thereof into which the lower end of the drive shaft and associated rotor extend. A shield is provided which is supported on and positioned by the drive shaft in underlying spaced relationship to the lower end of the rotor and associated counterweight. As the rotor rotates, lubricant disposed between the shield and rotor therein is thrown outwardly across the end turns of the stator thus serving to cool same. The shield serves to restrict the return flow of oil to the area immediately below the rotor thus reducing the viscous drag on the motor yet still allowing sufficient circulation of oil to achieve the desired cooling of the stator.

Abstract: In order to continuously supply lubricant to compressor bearings independent of attitude, and under varying gravitational forces, an oil supply system (10) includes an oil sump (14), a pump (22), and a suction tube (24). The oil sump (14) is defined at least in part by a pair of intersecting sump walls (16, 18) each of which may comprise a primary wall dependent upon instantaneous compressor attitude. The pump (22) is adapted to supply the compressor with oil (20) while at the same time removing gases from the oil (20) and expelling the removed gases into the oil sump (14). Additionally, the suction tube extends from the pump to a strategic point within the oil sump (14) for drawing oil (20) from the oil sump (14) to the pump (22) in a manner assisting in priming and repriming during brief interruptions in the flow of oil (20) from the oil sump (14).

Abstract: An oil filtration and exhaust apparatus for filtering particulates and gases from the recirculating oil of a vacuum pump which is adapted to remove gases from a process enclosure. The oil filtration and exhaust apparatus removes particulates and gases from the recirculating oil by means of particulate filters and a gas scrubbing filter. Additionally, the exhaust gases are demisted prior to exhaust to an exhaust header. The apparatus is particularly suited to semiconductor manufacturing processes.

Abstract: A lubricant circuit and a process for circulating a lubricant through such lubricant circuit of a compressor unit incorporating a planetary rotating compressor having a piston in an opening of a cylinder-piston. One embodiment of a circuit and one embodiment of a process of this invention relies on pressure in a lubricant separator vessel to force the flow of lubricant through the circuit to the compressor, and used lubricant pump as a scavenge pump. Another embodiment of a circuit and another embodiment of a process of this invention relies on the pressure developed by the lubricant pump to force the flow of lubricant through the circuit to the compressor, and utilizes a float operated valve to maintain constant lubricant level in the lubricant separator vessel.

Abstract: A fluid management system for a rotary screw vacuum pump is provided in which lubricating fluid is transmitted to the vacuum pump from an oil supply reservoir while a coolant fluid is circulated to the vacuum pump from a fluid reservoir containing a supply of liquid coolant. After passing through the rotary compressor and lubricating the compressor one time, the lubricant merges with the coolant and the mixture is stored in the fluid reservoir to be reused as a coolant for the rotary screw compressor. The fluid reservoir containing the fluid is provided with a controller that senses the quantity of liquid within the fluid reservoir and provides additional liquid to the reservoir when the liquid levels falls below a predetermined magnitude. In addition, the controller drains liquid from the fluid reservoir when the liquid level within the reservoir exceeds a predetermined magnitude. A water soluble lubricant is used in association with water as a coolant in a preferred embodiment of the present invention.

Abstract: A rotary compressor and process of compressing compressible fluids wherein the compressor comprises a housing having at least two axially spaced walls and rotatable in relation to the housing cylinder-piston and piston elements journaled on eccentric portions of cylinder-piston and piston shafts rotating in opposite directions. The axially spaced walls of the housing form stationary walls, and the cylinder-piston and piston elements form moveable walls of at least two compression chambers. Circulated compressible fluid is drawn into the compression chambers through intake channel and intake port in the piston shaft and ports in the piston element, and discharged after compression through the same ports in the piston element, and through discharge port and into the discharge channel located in the piston shaft.

Abstract: A scroll compressor comprises an orbiting scroll and a fixed scroll, each of which has a wrap formed on an end plate in upstanding position. These orbiting and fixed scrolls are assembled together with the wraps facing inwardly to each other so as to define a plurality of spaces by the wraps and the end plates of both scrolls. These spaces move toward the center of both scrolls during the orbiting movement of the orbiting scroll so as to reduce the respective capacities of the spaces. Thus, compression of a fluid is carried out. This compressor also includes a motor for driving the orbiting scroll and a driving shaft for connecting the orbiting scroll and the motor. At the end of the driving shaft on the motor side, a first oil supply pump is provided with its suction port communicating to an oil sump of the compressor.

Abstract: A hermetic scroll compressor is disclosed including within a hermetically sealed housing a fixed scroll member, an orbiting scroll member, and a crankshaft operably coupled to the orbiting scroll member and driven by a motor. The crankshaft has an axial passageway therein that is in fluid communication with an oil sump located in a discharged pressure chamber within the housing. Upon rotation of the crankshaft, a centrifugal oil pump delivers oil through the axial passageway to the bottom surface of a plate portion of the orbiting scroll member. An oil passage extends through the orbiting scroll plate to introduce oil into a discharge compression chamber established by the intermeshing fixed and orbiting scroll members. Accordingly, oil is introduced into the compression chamber and intermediate the scroll members without the creation of an intentional pressure leak. The size of the oil passage can be varied to affect the amount of oil introduced into the compression chamber.

Abstract: A compressor unit composed of a fixed scroll and an orbiting scroll which are engaged with each other, and a variable speed motor are disposed in a hermetic chamber. A first bearing is provided in an engagement portion between a crankshaft and the orbiting scroll in an intermediate pressure chamber provided on a back surface of the orbiting scroll for applying thereto an intermediate pressure between a discharge pressure and a suction pressure. The crankshaft is supported by a second bearing provided close to the orbiting scroll and a third bearing provided close to the motor. The first, second and third bearings are lubricated by force of a differential pressure between the discharge pressure and the intermediate pressure through an oil passage. The oil passage is in communication at one end thereof with the lubricant oil on which the discharge pressure is applied, and opens at the other end thereof into the intermediate pressure chamber.

Abstract: A scroll-type machine which incorporates a self-pressurizing hydrodynamic thrust bearing to maintain a constant interface of oil between the axial thrust surfaces.

Abstract: In a mechanical supercharger having rotors mounted on rotor shafts, the rotor shafts are rotationally and axially supported in the supercharger housing by first and second sliding bearings. The first sliding bearing includes an inner part fixed to each of the rotor shafts and having both a cylindrical part and a radially extending, disc-like plate part. The first bearing also includes an outer part having bores closely surrounding the cylindrical parts of the inner part and axial surface facing an axial surface of the plate parts of the inner parts. A retainer engages the outer part and encloses another axial face of the inner part to form bearing spaces into which oil can be pumped for lubricating the sliding bearing. The pump can be in the form of spiral grooves in the radially extending, disc-like plate part.

Abstract: A low pressure container type rolling piston compressor which includes a compression element, a motor element, a rotary shaft with an eccentric portion driven by the motor element, a cylinder for receiving therein the eccentric portion of the rotary shaft, a rolling piston having an inner circumference to which the eccentric portion is fitted and an outer circumference which rolls along the inner wall surface of the cylinder, a vane having an end which is in contact with the outer circumference of the rolling piston to divide the inner space of the cylinder into a high pressure chamber and a low pressure chamber, a pair of bearing plates for closing both open ends of the cylinder, a sealing container housing the above-mentioned structural elements and storing at its lower part a lubricating oil wherein a pressure in the sealing container is the same as that in the low pressure chamber and wherein an oil supplying passage is formed in either one of the pair of bearing plates for closing both open ends of the c

Abstract: A scroll machine comprises a pair of scrolls 18, 21 rotating on different axes to form a compression chamber A therebetween and discharging compressed gas in the compression chamber B to a discharge chamber, a pair of boss portions 16b, 17b immersed in lubricant oil for rotatably supporting the respective scrolls through bearing means, a first oil supply path 16c; 43 formed in one of the boss portions for communication with a bearing receiving recess 16d; 17a of the one boss portion, a second oil supply path 18b; 44, 45 formed in one of the scrolls on the side of the one boss portion for communication of the first oil supply path with the compression chamber through the recess, and a pump 33; 42 coupled to a shaft portion of the one scroll for supporting it rotatably within the bearing boss portions and for supplying oil in the discharge chamber to the first oil supply path.

Abstract: Patent of Invention for "GAS AND OIL COOLING SYSTEM IN A HERMETIC COMPRESSOR" for small refrigeration machines of the type including an assembly wherein is defined a cylinder housing a piston driven from a crankshaft coupled to an electric motor and forming suction and compression chambers inside the cylinder, these elements being assembled inside a sealed shell acting as a lubricant oil sump and incorporating independent lubricant oil outlet and return tubes connected to a heat exchanger external to the shell. The system in question includes oil pumping means (20) assembled on the shaft (5) having its suction (24a) connected to the lubricant oil contained in the bottom of shell (1) and its discharge (24b) connected to the oil outlet tube (9a), the discharge (24b) of the oil pumping means (20) being maintained in fluid communication with the cylinder compression chamber (2) through a compressed refrigerant gas conduit (26a).

Abstract: In a scroll compressor, a thrust bearing is movably held and urged to support thrust force of an orbiting scroll member against a fixed scroll member within a predetermined stroke in the axial direction of the scroll members, thereby to always allow desirable minute gap and also allow to move back against the urging force to reduce abnormal pressure in a compression chamber.

Abstract: A combined compressor and pump has two parallel shafts journalled in a housing having a compressible fluid inlet and a compressible fluid outlet. Rotors are mounted on each of the shafts for forming a roots type compressor and compressing fluid from the compressible fluid inlet. One shaft of the compressor, which forms a supercharger for an engine, is driven by the engine, and the other shaft is driven in synchronization therewith by a pair of meshing gears mounted on the shafts, the meshing gears being constructed so as to form a gear pump. A coolant circulates within a coolant jacket in the housing and is circulated by the gear pump. The heated coolant may be circulated through a closed loop including a heat exchanger and a bypass passage for bypassing the heat exchanger during low temperature operating conditions.

Abstract: A scroll machine having an eccentric crank pin on a crankshaft disposed nonrotatably in the bore of a drive bushing for driving the orbiting scroll of the compressor. A flat surface on the crank pin drivingly engages a flat surface in the bore, and a unique lubrication arrangement incorporating a hydrostatic bearing is provided to lubricate the flat surfaces. Several alternative embodiments are also disclosed.

Abstract: The motion of the orbiting scroll is used to cause pumping of oil in a hermetic horizontal scroll compressor.

Abstract: A twin-shaft vacuum pump having a pair of shafts, at least one pump chamber, a pair of rotors disposed in the or in each pump chamber and mounted on the shafts, and housing members defining the pump chamber or chambers, a synchronization mechanism composed of two gears disposed in a side chamber, a drive motor, and a transmission mechanism connecting the drive motor to one of the shafts. In order to simplify installation and servicing of the pump, the shafts are mounted vertically. The side chamber, synchronization mechanism, and transmission mechanism are disposed below the lower rotor pair.

Abstract: A vacuum pump system comprising a first vacuum pump having at least one pumping chamber with port means for communication with an enclosure to be evacuated and having mechanical pumping means mounted on at least one shaft whose bearings and/or gears are contained in a housing and a second vacuum pump having a first pumping chamber with means for communication with the chamber of the first pump and at least one further pumping chamber wherein means are provided for communication between the housing of the first pump and a further pumping chamber of the second pump.

Abstract: A hermetic horizontal scroll compressor uses the motion of the Oldham coupling to pump oil from the sump to a lubrication distribution system for the scroll compressor.

Abstract: An oil feeding device for a scroll fluid apparatus including an oil flow passage in the crankshaft providing oil to the crank pin bearing, an intermediate pressure chamber, and the sealed spaces between the scroll members.