Abstract: A scavenge pump includes: a pump housing including a housing body and a cover member, the housing body having a rotor chamber in which an inlet port, an outlet port, and a bearing hole formed by shaft holes with varying diameters with a stepped surface therebetween are provided; an outer rotor housed in the rotor chamber and having inner teeth; an inner rotor having outer teeth and a shaft support hole; and a drive shaft inserted or fixedly attached to the shaft support hole. The bearing hole includes a stepped inner circumferential part having a larger diameter than that of the drive shaft at an open peripheral edge on one side facing the rotor chamber, and a groove that extends through between a point close to a trailing end of the outlet port and the stepped inner circumferential part is formed.

Abstract: A motor able to prevent axial displacement of a rotor in a simple structure without increasing the number of parts of the motor. The motor includes a rotor including a shaft, a housing configured to support the shaft rotatably and movably in a limited manner in an axial direction, a flange disposed on an axially outside of the housing and configured to rotate integrally with the shaft, the flange projecting radially outward from the shaft and being configured to prevent a foreign object from entering the housing, and a temporary tacking structure provided in at least one of the flange and the housing, and configured to temporarily tack the housing and the flange to each other in the axial direction.

Abstract: A vacuum type of scroll pump includes a frame, a stationary plate scroll, an orbiting plate scroll, a non-energized type of tip seal or seals, an eccentric drive mechanism assembled to and supported by the frame and to which the orbiting plate scroll is assembled so as to be drivable by the eccentric drive mechanism in an orbit about a longitudinal axis of the pump, and a mechanism for adjusting the seal(s) created by the tip seal(s) without having to disassemble any of the frame, plate scrolls or parts of the eccentric drive mechanism from one another, i.e., while a pump head assembly of the pump remains intact.

Abstract: A hinged joint is formed on a volumetric rotary machine with a spherical working cavity formed between a spherical rotor part and the spherical surface of the body, between a piston, which is mounted in such a way as to enable rotary oscillations relative to the rotor in the plane passing along the axis of rotation of the rotor, and a rotor, which is mounted in such a way as to enable rotation about the spherical rotor part. This solution has made it possible to increase the reliability, service life and thermal stability of machines of this type. In addition, helical channels for communication between symmetrical working chambers and channels within the rotor for connecting the working chambers to the working-medium inlet and outlet openings are formed inside the spherical rotor part. This solution has made it possible to increase the specific power of the machine.

Abstract: A compressor includes a compression mechanism having lower and upper stage compression chambers. Refrigerant compressed in the lower-stage compression chamber is further compressed in the higher-stage compression chamber. An intermediate injection pipe is arranged to inject refrigerant between the lower-stage and the higher-stage compression chambers. The compression mechanism includes at least one fixed member having a fixed end plate, and at least one movable member having a movable end plate section facing the fixed end plate with at least one of the compression chambers interposed between the end plate sections. At least one intermediate back pressure chamber is formed to face a back surface of the movable end plate section. The intermediate back pressure chamber communicates with a discharge side of the lower-stage compression chamber, and is arranged such that internal pressure of the intermediate back pressure chamber acts on the movable end plate section.

Abstract: A positive displacement rotary machine with a body having an internal spherical cavity, a rotor, and a ring working cavity formed by the body and the rotor. The working cavity is functionally divided into bypass and propulsion halves. A separator embodied in the form of a wobble plate is mounted in the working cavity at an angle to the rotor. A piston with a sealable through-slot for the separator passage is mounted in a slot made in the rotor. Multiple openings made through the separator in the propulsion half of the cavity make the separator transparent for the working medium flow. The openings are small enough so the separator seals the through-slot of the piston. The configuration allows for one input port and one output port on the opposite sides of the separator in the bypass half to make the supply steady.

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 rotary compressor is provided. The rotary compressor may include a plurality of cylinders each having a suction port formed such that an intersection of a center line of the suction port and a center line of a vane slot is positioned at a predetermined interval closer to the vane slot than to an intersection between a center of an inner diameter of the cylinder and the center line of the vane slot. A proximal end of the suction port may be formed in the vicinity of the vane slot so as to advance a compression start angle of a compression space and reduce a dead volume between the vane slot and the suction port, thus improving compressor performance.

Abstract: A scroll type compressor is disclosed. The scroll type compressor includes a housing, a frame, a compartment, a separator, a scroll pairs, a slider, a plurality of compartments, at least a pressure-regulating mechanism, and a guiding element. The compartment in the housing is separated into a high-pressure compartment, a low-pressure compartment, and a middle-pressure compartment. The separator is disposed between the high-pressure compartment and the low-pressure compartment. The separator includes an outlet at the center thereof, and at least a passage through the separator. When the pressure in the high-pressure compartment is less than that in low-pressure compartment, the pressure-regulating mechanism is opened to exhaust pressure from the middle-pressure compartment to the high-pressure compartment.

Abstract: An oil pump includes a housing including a rotor receiving portion at an inner side and an inner rotor accommodated in the rotor receiving portion formed at the housing. The inner rotor includes a plurality of outer teeth sequentially arranged at an outer peripheral side and integrally rotating about a first rotational center with a drive shaft. An outer rotor is also accommodated in the rotor receiving portion and includes a plurality of inner teeth sequentially arranged at an inner peripheral side, the outer rotor rotating about a second rotational center eccentric relative to the first rotational center by a predetermined amount in relation to rotations of the inner rotor in such a manner that the inner teeth and the outer teeth engage with each other. A restriction portion restricts an operating range of the outer rotor in a direction perpendicular to an eccentric direction.

Abstract: A vane motor is modified to increase the sealing effectiveness of the gap made at the interface of the spindle and cylinder by undercutting the cylinder a predetermined amount and distance so as to increase the effectiveness of the spindle to cylinder gap and to decrease the requirements for lubrication of the vane motor.

Abstract: A rotary vane apparatus where the rotor has a rotational axis and carries at least one vane which is supported by a vane guide apparatus for rotation about a stator axis which is spaced from the rotor axis a preselected amount and where both the rotor and vane have axial flat surfaces which are rotated adjacent to stationary flat surfaces of a stator or stator endplates, the invention provides axial adjustment of the vane with respect to the flat surface of the stator endplates and independently provides an adjustment of the rotor end surfaces with respect to the stator end surfaces.

Abstract: An internal gear pump that does not contain any filler elements comprises a housing (1) and a bearing ring (5), which is accommodated inside a recess (13) of the housing in a manner that permits it to transversally move in relation to its axis but not to rotate. The internal gear pump also comprises an internal-geared ring gear (3), which is mounted inside the bearing ring in a manner that permits it to revolve, and a pinion (2), which is mounted inside the housing in a manner that permits it to rotate and which meshes with said ring gear. The inner peripheral surface of the housing recess (13) coaxially extends in relation to the pinion (2), and the bearing ring, which is eccentrically arranged with regard to the pinion axis (15), can pivot in relation to the housing recess about a parallel pivotal axis (22, 23) that is parallel to the axis thereof. The bearing ring can pivot without the tight contact between the tooth tips of the pinion (2) and ring gear (3) being lost.

Abstract: A rotary vane apparatus where the rotor has a rotational axis and carries at least one vane which is supported by a vane guide apparatus for rotation about a stator axis which is spaced from the rotor axis a preselected amount and where both the rotor and vane have axial flat surfaces which are rotated adjacent to stationary flat surfaces of a stator or stator endplates, the invention provides axial adjustment of the vane with respect to the flat surface of the stator endplates and independently provides an adjustment of the rotor end surfaces with respect to the stator end surfaces.

Abstract: A scroll type apparatus for fluid displacement is disclosed. In one embodiment, the apparatus includes an adjustment mechanism capable of being adjusted after assembly of the apparatus to close an axial gap between scroll members and account for manufacturing tolerances in apparatus components. In another embodiment, the apparatus includes an orbital scroll of two portions, with a supporting portion surrounding an eccentric bearing of higher density than that of a scroll portion. The center of mass of the orbital scroll is thus moved towards the eccentric bearing to reduce torquing of the scroll as it orbits. In a further embodiment, the apparatus includes an orbital scroll having two portions, a supporting portion surrounding an eccentric bearing having a lower coefficient of thermal expansion than that of a scroll portion, to reduce thermal expansion of the supporting portion, reducing misaligmnent of the eccentric orbital scroll on the bearing.

Abstract: The present invention provides an adjustable rotor and/or stator, so that the interference fit and/or clearance can be adjusted. The rotor and/or stator are tapered to provide a difference in fit between the rotor and stator by longitudinal adjustment of their relative position. The relative longitudinal adjustment is achieved in response to a change in temperature and is matched to the taper angle of the stator/rotor to maintain a desired interference fit.

Abstract: The present invention provides an adjustable rotor and/or stator, so that the interference fit and/or clearance can be adjusted. The rotor and/or stator are tapered to provide a difference in fit between the rotor and stator by longitudinal adjustment of their relative position. In one embodiment, the adjustment may occur while the PCP in mounted downhole in a wellbore. In another embodiment, the adjustment may occur automatically depending on sensor input of operating conditions of the PCP.

Abstract: A rotary pump has a simple construction by omitting a transmission shaft on the side of a motor and whereby makes a cost of the rotary pump as low as possible, with maintaining feature that assembling and disassembling is facilitated. The rotary pump has a main casing, a casing cover cooperated with the main casing for defining a pumping chamber therebetween, a pair of rotors received within the pumping chamber with mutually meshing pumping segments for synchronous revolution in mutually opposite directions, a space being defined in one portion of the casing cover, a cover piston being disposed within the space for movement back and forth with respect to an end surface of the rotor, and an air cylinder being mounted on the casing cover and having a piston rod, to which the cover piston is connected.

Abstract: A scroll type fluid machine which can practically exhibit an appropriate meshing condition between an orbiting scroll member and an unorbiting scroll member and which can enhance the energy efficiency.

Abstract: A double screw rotor assembly includes two screw rotors meshed in a bushing inside a casing. The threads of the screw rotors have a uniform pitch, and define with the bushing a plurality of air chambers in the pitch. The volumes of the air chambers reduce gradually from the inlet toward the output due to the reduce of tooth high so that the outer diameter defined by the tooth tip of the thread of each screw rotor has the shape of an invertedly disposed cone. Adjustable spring means is provided to impart an axial spring force to the bushing relative to the casing, guide means is provided to guide axial movement of the bushing relative to the casing, and a O-ring is disposed between the top wall of the bushing and the casing. Adjusting the pre-loading of the spring means controls the dimension of the clearance between the inside wall of the bushing and the tooth tip of the thread of each screw rotor.

Abstract: A double screw rotor assembly includes two screw rotors meshed in a bushing inside a casing. The threads of the screw rotors have a constant pitch, and define with the bushing a plurality of air chambers in the pitch. The volumes of the air chambers reduce gradually from the inlet toward the outlet due to reduced tooth height so that the outer diameter defined by the tooth tip of the thread of each screw rotor has the shape of an invertedly disposed cone. An electric driving device is controlled to move the bushing axially in the casing relative to the screw rotors in adjusting the clearance between the inside wall of the bushing and the tooth tip of the thread of each screw rotor, so as to minimize the consumption of starting power and facilitate stable running of the screw rotors, Further, a O-ring is provided at the top wall of the busing and pressed on the casing to keep an airtight status, so as to improve the working efficiency.

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 internal gear pump includes in a pump housing an outer rotor including an internal gear portion on the inner periphery, and an inner rotor being eccentrically disposed with respect to the outer rotor and including an external gear portion on the outer periphery that is engaged with the internal gear portion of the outer rotor. A side plate is integrated with the outer rotor to abut on a side of the inner rotor that fails to be in slide contact with the housing. A holding device is mounted to the pump housing to restrict a position of the outer rotor with respect to the housing.

Abstract: A dual shaft, timed element high pressure industrial rotary lobe pump is provided. Lubricated sleeve bearings are located adjacent to the pumping elements. If the sleeve bearings are disposed on both opposing sides of the pumping elements, the lobe pump of the present invention can be operated at pressures as high as 400 psi. If sleeve bearings are disposed on one side of the pumping elements, the lobe pump can be operated at pressures up to 200 psi. Threaded thrust bearing cartridges enable fast and efficient positioning of the pumping elements during assembly without the use of shims. Recessed areas disposed in the head plate and in the casing bore provide improved loading and unloading of the pumping elements for high speed operation with reduced pressure pulsations and reduced noise. Access to the mechanical seals is simplified due to the easy removal of the timing gear box. The pump is also designed to accept standard mechanical seals as opposed to custom designed mechanical seals.

Abstract: Rolling element bearings capable of both axial and radial restraint are readily removably mounted on the shaft of each screw rotor so as to allow a clearance type radial fit between the bearing and shaft. A washer engages the inner race of the bearing which also engages a shim. A bolt squeezes the inner race between the washer and shim to secure the bearing in place while the shim thickness/height determines the position of the rotor within the casing.

Abstract: An improved rotary lobe pump has a pumping chamber (1) having a housing (2) closed by a front wall (3)and a rear wall (6). The front housing wall (3) is secured to the housing (2) by bolts (4) and is sealed with a gasket (5). The housing (2) comprises a rear housing wall (6) running parallel with the front housing wall (3). The rear housing wall (6) includes an orifice designed in the form of a sealing hub (7) through which a drive shaft (7) enters the pumping chamber (1). A rotor in the form of a rotary lobe piston (10) can be slidably placed on that end (9) of the drive shaft (8) which projects into the pumping chamber (1). Provided on the rotary lobe piston (10) and integral therewith is an axial extension in the form of a sleeve (13) which surrounds the drive shaft (8) and passes through the sealed hub (7) the seal (20) surrounding the hub (7) is thus in contact with the sleeve (13).

Abstract: An adjustable attachment for connection of a rotor to a shaft which provides precise axial positioning of the rotor with respect to a motor housing. The adjustment is effected by a screw mounting of the rotor on the shaft and spring discs placed in a compartment in the motor housing with a shaft spacer placed between the rotor and the discs. The adjustment feature is especially adapted for use in conjunction with sliding vane type vacuum pumps, compressors and air motors.

Abstract: A scroll-type fluid displacement apparatus includes a compressor housing, which contains a compression mechanism and a driving mechanism operatively connected to one another. The compression mechanism includes a fixed scroll and an orbiting scroll interfitting at angular and radial offsets, and a rotation preventing mechanism which prevents rotation of the orbiting scroll during its orbital motion. The driving mechanism includes a drive shaft axially disposed within the housing and rotatably supported by an inner block, which is fixedly disposed within the housing. An axial movement regulating mechanism for regulating an axial movement of the driving mechanism is disposed between the inner block and an internal component of the compressor axially spaced from the inner block.

Abstract: A prime mover or pump comprising of a first stationary plate and a second plate arranged parallel to the stationary plate and spaced therefrom. The second plate is rotatably mounted about its central axis. A plurality of elongated wall elements are disposed between the plates. The wall elements slidably bear on the plates to form a seal therewith such that working chambers are created. Each wall element is articulated at one end point to a further wall element such that the wall elements form a movable grid. The grid is rotatably secured at at least one point to the stationary plate and at at least two points to the rotatable plate such that the working chambers assume their maximum and minimum volumes upon rotation of the rotatably plate.

Abstract: A single screw compressor for varying the pressure of a fluid characterized in that the alignment of the mainrotor and the gaterotor axes is maintained in the presence of distortion due to temperature and pressure gradients. The structural arrangement permits fabrication of a relatively light weight compressor.

Abstract: The invention relates to scroll type fluid compressor which includes a mechanism for adjusting axial clearance and alignment. Adjustment sleeves, which are disposed threaded apertures of the compressor housing, move for and aft, and adjust the location and alignment of the scrolls. A threaded member passes through the sleeve to engage a threaded aperture on the end plate of the fixed scroll to thus fix the fixed scroll within the housing.

Abstract: A method and apparatus for adjusting the angular relationship between the scroll elements of a scroll type fluid displacement apparatus are disclosed. Holes are provided in the front end plate of the apparatus housing and the end plate of the orbiting scroll member. An adjusting member is inserted through these holes and is received in a bore provided in the fixed scroll member. The front end plate then is rotated in the reverse direction (opposite the drive direction) of the apparatus until its movement is stopped. The apparatus drive shaft then is rotated in the drive direction in order to establish the proper angular relationship between the scroll members. While the drive shaft is being rotated, the front end plate is secured to the housing in order to maintain the desired angular relationship.

Abstract: A scroll-type fluid displacement apparatus and a method of assembling the apparatus wherein an adjustment member provides proper alignment of parts. The apparatus includes a front end plate and a casing through which a hole extends, a bore formed in the end plate of an orbiting scroll, and a hole formed in a fixed scroll. The front end plate is fixed on the casing and the adjustment member is inserted through the hole and extends into the hole of the fixed scroll and the bore of the orbiting scroll. Then, the front end plate is rotated toward the driving direction until further movement is prevented. The front end plate is then tightly secured on the casing, thus adjusting the angular relationship between both scrolls.

Abstract: A gear machine has a housing with a sealing recess and a sealing region, two gear members engaging with one another and arranged so that after mounting of the machine the gear members penetrate into a material removing manner into the sealing region of the housing for sealing purposes, and an element for urging the gear members and the sealing region of the housing to contact with one another prior to a material removal from the housing.

Abstract: A rotary fluid machine of the kind that is to be actuated by any fluid under pressure in which a rotor (15) carrying a piston member (15.sub.4) rotates continuously when the machine is in operation about the axis (AA1) of an annular chamber (21), the piston member (15.sub.4) is geared to rotary obturators (17.sub.A 17.sub.B) that rotate in sealing chambers 21.sub.1 in an annular member 21.sub.2 projecting into the annular chamber 21 about an axis (BB1, CC1) substantially parallel to said axis (AA1) of the annular chamber (21) and the rotary obturator has a recess into which a part of the piston enters during rotation to provide a working section in the cylinder as working fluid is fed to the piston. The machine is characterized in that the piston member (15.sub.

Abstract: A scroll type fluid displacement apparatus is disclosed having an adjustment mechanism for adjusting the axial clearance between the spiral elements and end plates of the fixed and orbiting scrolls. The apparatus includes a housing having a front end plate and a cup shaped casing attached thereto; the cup shaped casing has a fluid inlet port and a fluid outlet port. A fixed scroll, which includes a first end plate and a first spiral element, is fixedly disposed within the interior of the cup shaped casing. A large threaded opening is formed through an end plate of the cup shaped casing. An adjusting screw is screwed in the threaded opening to abut against the end surface of the fixed scroll. After adjusting the axial clearance between the fixed and orbiting scrolls by adjusting the position of the adjusting screw, a plurality of bolts fasten the fixed scroll to the cup shaped casing to prevent further axial movement.

Abstract: A dual screw-type pump is provided with a means for balancing the resultant dynamic axial thrust on the screw assemblies during operation of the pump. The resultant thrust on each assembly is absorbed in part by a circular piston on the assembly near the rear of the pump and the remainder by a thrust bearing engaged with the assembly near the front of the pump. The longitudinal position of one of the screw assemblies is selectively adjustable relative to the position of the other screw assembly to balance the thrust on the screw assemblies.

Abstract: A rotary piston engine is disclosed of a novel, geometric construction whereby substantially pressure dependent operation is ensured along with continuous torque characteristics. In the preferred inventive embodiment, an elongated rotatable shaft having a disc plate intermediate thereof is provided with a pair of rotor assemblies disposed to either side of the disc plate and attached for rotation as a unit, each rotor assembly including an inner and an outer concentrically arranged ring of different diameters with a radially extending piston vane disposed therebetween in linking relationship therewith. A slotted intermediate ring is placed between the inner and outer rings of each respective rotor assembly, the intermediate ring being journalled off-center of its respective rotor assembly such that the intermediate ring effects a rolling contact seal with both the inner and outer rings of the rotor assembly during rotation thereof.