Abstract: A scroll compressor includes a feature for location of a housing shell section off of one of the scroll compressor bodies. According to this aspect, a scroll compressor comprises a housing including a shell section; scroll compressor bodies having respective bases and respective scroll ribs that project from the respective bases and which mutually engage about an axis for compressing fluid; and a drive unit operative to facilitate relative movement between the scroll compressor bodies. The shell section is located axially relative to a remainder of the housing off of one of the scroll compressor bodies.

Abstract: A Moineau style stator includes a helical cavity component having reinforced helical lobes. The lobes are reinforced with a three-dimensional network of physically bonded aggregate particles. The network of bonded aggregate provides a porous skeletal-like structural reinforcement. Pore volume between the bonded aggregate particles may optionally be partially or substantially filled with an elastomer. An elastomer liner is typically deployed on an inner surface of the helical lobes to promote a rotational interference fit with a rotor.

Abstract: A compressor apparatus (20) has a housing (22) having first (53) and second (58) ports along a flow path. One or more working elements (26; 28) cooperate with the housing (22) to define a compression path between suction (60) and discharge (62) locations along the flow path. An unloading valve (100) has a valve element (102) having a range between a first condition and a second condition, the second condition being unloaded relative to the first condition. Means (120, 160) bias the valve element toward a third condition intermediate the first and second conditions.

Abstract: A rotary lobe pump comprises a pump body having a driving means and an outer casing, and an insert that can be replaced. The replaceable insert comprises a housing formed of a plastic material and having an inlet port, an outlet port and internal surfaces defining a pumping chamber. The replaceable insert also includes a pair of lobed rotors arranged for rotation within the pumping chamber. The housing includes apertures through which the lobed rotors may be rotationally driven, so that the lobed rotors mesh together for pumping a fluid from the inlet port to the outlet port.

Abstract: Scrolls made from one or more near-net shaped powder metal processes either wholly or fabricated together from sections. Both “conventional” press and sinter methods and metal injection molding methods will be described.

Abstract: Scroll type fluid machinery, in which two stationary scrolls (2A, 2B) are fixed onto a housing (1), and form volume changing mechanisms (50A, 50B) with matching orbiting scrolls (3A, 3B). Three orbiting units (40) are located between the two volume changing mechanisms. Each orbiting unit comprises a rotating member (10) and a thrust-cancelling shaft (20). Assembly sets of the thrust-canceling shaft consist of turning elements and a connector, which in turn connects with orbiting scrolls through threads. There exists only circumferential constraint but no axial constraint between the connector and the turning element. Rotating turning element will rotate the connector, and thus move the two orbiting scrolls closer or farther through the threads on the connector. The rotating member of this invention further provides a larger space to the supporting bearings (14A, 14B) of the thrust-canceling shaft, and also eases component manufacturing, machinery's assembly and adjustment, and bearings' cooling.

Abstract: A pump system includes inlet chambers, an outlet chamber, and rotors disposed inside the inlet chambers and the outlet chamber to pump a process fluid from the inlet chambers to the outlet chamber and to direct the process fluid to a separator. A gear chamber is configured to receive a portion of the process fluid from the separator. First and second sets of pump bearings are coupled to the rotors and lubricated by the portion of the process fluid flowing from the gear chamber. A conduit is configured to direct the portion of the process fluid from the pump bearings back to the gear chamber. Some of the portion of the process fluid lubricating the pump bearings is permitted to leak to the inlet chambers. Additional process fluid is continually added to the portion of the process fluid to compensate for fluid leaking to the inlet chambers.

Abstract: In a pump system, a process fluid is directed into inlet chambers of a pump casing at an inlet pressure, and a plurality of rotors disposed inside the pump casing are rotated to pump the process fluid from the inlet chambers to an outlet chamber located between the inlet chambers, wherein the process fluid in the outlet chambers is at an outlet pressure. The process fluid is directed from the outlet chamber to a separator configured to separate particulate matter from the process fluid, and a portion of separated process fluid is directed from the separator to a gear chamber of the pump. Pump bearings are lubricated with the portion of separated process fluid from the gear chamber. Some of the portion of the separated process fluid from the pump bearing is leaked to the inlet chambers via rotor shrouds to reduce accumulation of particulate matter in the inlet chambers.

Abstract: A screw pump system has a plurality of rotors disposed inside a pump casing. Each rotor comprises a shaft and a set of threads disposed on the shaft configured to mesh with at least one other set of threads. A plurality of bearings are coupled to each end of each of the rotors. A plurality of gears are coupled to an end of each of the rotors. The gears are configured to reduce a size of particulates in a lubrication fluid by flowing the particulates through the rotating gears. The gears may serve as timing gears for the rotors as well as perform pumping of the lubrication fluid.

Abstract: A pump having a rotor, a stator, a housing enclosing the rotor and the stator, the housing having an inlet for a fluid, and a port for receiving a fluid which acts on deposits on a surface of the rotor and on a surface of the stator positioned downstream from the inlet.

Abstract: A progressing cavity pump comprises at least an inner pump rotor enclosed by at least an outer pump rotor so as to collectively form one or more, in principle, separate pump cavities which, according to known geometric principles, will be moved axially through the pump upon bringing the rotors into coordinated rotation. At least two pump sections are disposed therein, each of which comprises one outer pump rotor and one adapted inner pump rotor. The outer pump rotors of all pump sections are fixedly supported and arranged along the same axis, wherein all the inner rotors are supported in fixed positions relative to a pump casing of the pump. The outer rotors of all pump sections are driven by the same motor via at least one differential arranged to allow each pump section to rotate at a mutually different rotational speed.

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

Abstract: A method for converting energy from compressed air into mechanical energy, and a compressed air motor therefor. The motor includes a shaft rotor and a counterpart rotor which intermesh with each other using trochoid toothing to effect rotation of a power takeoff shaft. Compressed air is used to operate the counterpart rotor which then operates the shaft rotor thereby converting the rotation of the shaft rotor or the power takeoff rotor into mechanical rotary energy.

Abstract: A screw compressor (10) comprises a housing (12, 14, 16), a slide valve assembly (23) and a pulsation damper. The housing (12, 14, 16) receives a supply of working matter from a pair of intermeshing screw rotors (18, 20), and comprises a slide recess (51), a pressure pocket (32), and a piston cylinder (54). The slide valve assembly (23) regulates the capacity of the screw compressor (10), and comprises a slide valve (36) axially movable within the slide recess (51) and the pressure pocket (32), a piston head (40) axially movable within the piston cylinder (54), and a piston shaft (38) connecting the slide valve (36) with the piston head (40). The pulsation damper comprises a flange (58) for separating the pressure pocket (32) from the piston cylinder (54), a bore (60) for receiving the piston rod (38), and a damping channel (46A) extending through the flange (58).

Abstract: In the case of speed-regulated high-power drives and with simultaneously high demands on accuracy or dynamics, the object of the invention is to reduce a very high level of complexity of the power electronics (high clock frequency), the motor (high precision) and mechanical transmission (low-play transmission elements). For this purpose, the invention proposes a drive device for rotational and/or t translational movements. The drive has a plurality of drives for the joint, mechanically coupled driving of a working machine or for moving a mass. It also has a control device. At least one drive is intended to provide the power (as a power drive). At least one further drive is provided and mechanically coupled as a servo-drive for controlling or regulating the accuracy and/or dynamics of the overall drive. The control device controls and regulates the at least two mechanically coupled drives.

Abstract: A plurality of scroll compressors with different fixed volume indexes are connected in fluid parallel circuit and configured to selectively operate to maximize isentropic efficiency at different condensing temperatures. Different quantities of scroll compressors of different volume indexes may be selected based upon typical climate or geographic location environmental conditions to attempt to maximize efficiency. A controller may selectively operate different combinations of the compressors of different volume indexes bases up load demands and condensing temperature conditions, which may be determined in a variety of ways.

Abstract: A hydraulic pump is disclosed. The hydraulic pump may have a first fluid section (12), a second fluid section (14), and an input shaft (16) extending through the first fluid section and the second fluid section. The input shaft may have a first end (44), a second end (46), and a mid-portion (48) located between the first and second ends. The hydraulic pump may also have a first bearing (30) configured to continuously support the first end of the input shaft, and a second bearing (32) configured to continuously support the second end of the input shaft. The hydraulic pump may further have a third bearing (56) configured to intermittently support the mid-portion (58) of the input shaft.

Abstract: A device executing a start-up control method for an electric scroll compressor has a thermistor (18) and a pressure sensor (20) which, prior to the start-up of the scroll compression unit, detect temperature and pressure of a suction refrigerant introduced into the compression unit (2), and a controller (10) for controlling driving of a motor (4) of the compression unit (2) at the start-up of the compressor. The controller (10) determines at the start-up of the compressor whether or not a liquid refrigerant exists in the compression unit (2) on the basis of the detected temperature and pressure; selects either a normal start-up mode or a liquid-discharge mode in which the rotational speed of the motor (4) is regulated to be lower than in the normal start-up mode, according to the determination result; and controls the start-up of the compression unit (2) through the motor (4) according to the selected mode.

Abstract: The subject invention pertains to a method and apparatus for an orientation independent compressor. The subject compressor can be part of a vapor compression cycle system, and can use one or more of a variety of working fluids, including, but not limited to, refrigerants such as r-134a, r-22, CO2, and NH3. Embodiments of the compressor can utilize positive displacement means to compress the vapor. In a specific embodiment, the compressor can incorporate an oil-lubricated rotary lobed type positive displacement compressor. In a further specific embodiment, the working fluid can be a refrigerant, such as r-134a, incorporating entrained oil, such as miscible lubricating oils. An example of such a miscible lubricating oil that can be used is polyester (POE) oil.

Abstract: To simplify a pumping-out operation, prevent a follow plate from being contaminated by leakage of a fluid from a contact portion between the follow plate and a container, and reduce the size of a pumping-out apparatus.

Abstract: Roots-type blowers with helical cycloidal rotors exhibit variation in leakback flow with angular position intrinsic to these rotor geometries. Calibration of individual blowers using a combination of high-resolution alignment and enhanced detection of residual noise phenomena permits noise in as-produced blowers to be significantly attenuated. Intrinsic lower limits of noise induced by leakback variation are associated with manufacturing tolerances, necessary clearances, and particular geometric considerations. Gross alignment errors (excluding contact between rotors) produce a characteristic noise pulse rate that is three times the shaft rate. Proper alignment suppresses this and reveals a pulse sequence at double this rate and at about half of the amplitude of faulty alignment. The novel process explains the error mechanisms and defines repeatable calibration methods for a mass-production environment, introducing appropriate gauges and methods for the task.

Abstract: A two-stage screw compressor has a low-pressure stage screw compressor and a high-pressure stage screw compressor integrally constructed. Compression space is formed by a male rotor and a female rotor, and operation gas is fed for compression to the compression space. A method of supplying lubrication oil prevents degradation of volumetric efficiency caused by return of lubrication oil, coming from a bearing and a shaft sealing device, to the low-pressure stage screw compressor. As a result, refrigeration capacity is improved and the amount of the lubrication oil is reduced.

Abstract: A method for controlling a rotary fluid device includes providing a rotary fluid device having a fluid displacement assembly and a plurality of control valves. The fluid displacement assembly includes a first member and a second member. The first and second members have relative movement and define a plurality of volume chambers. The plurality of control valves is in fluid communication with the plurality of volume chambers. A desired displacement is received. A relative position of the first and second members is determined. An optimal displacement family is selected from a plurality of displacement families that is based on peak displacements of a plurality of displacement curves. A phase shift angle for the optimal displacement family is selected so that an actual displacement of the fluid displacement assembly approaches the desired displacement. The control valves of the rotary fluid device are actuated in accordance with the phase shift angle.

Abstract: The subject invention pertains to a method and apparatus for cooling. In a specific embodiment, the subject invention relates to a lightweight, compact, reliable, and efficient cooling system. The subject system can provide heat stress relief to individuals operating under, for example, hazardous conditions, or in elevated temperatures, while wearing protective clothing. The subject invention also relates to a condenser for transferring heat from a refrigerant to an external fluid in thermal contact with the condenser. The subject condenser can have a heat transfer surface and can be designed for an external fluid, such as air, to flow across the heat transfer surface and allow the transfer of heat from heat transfer surface to the external fluid. In a specific embodiment, the flow of the external fluid is parallel to the heat transfer surface.

Abstract: The present invention relates to an eccentric screw pump (1) comprising an eccentric screw (5) and an elastic element (4) surrounding the latter as well as a drive device, wherein the eccentric screw (5) or the elastic element (4) surrounding the latter comprises a magnetic/magnetisable part (8) so that force transmission between the drive device and the eccentric screw (5) or the elastic element (4) is exclusively effected via magnetic field forces and wherein a magnetic/magnetisable part (8) of the eccentric screw (5) or the elastic element (4) required for the drive is not in contact with the fluid to be delivered, more preferably protected from direct contact with the fluid with a plastic covering.

Abstract: A gerotor and methods for assembling the gerotor are disclosed. The gerotor includes a pump housing having a channel and a rotor positioning cavity, a pump shaft, an inner rotor, and an outer rotor. The pump shaft has central pump shaft axis and the inner rotor has a central inner rotor axis. The methods include: inserting the pump shaft through the channel; sliding the inner rotor onto the pump shaft at an oblique angle such that the central inner rotor axis is at least partially angularly offset from the central pump shaft axis; rotating the inner rotor to substantially align the central inner rotor axis and the central pump shaft axis and to engage the pump shaft with the inner rotor; and positioning the outer rotor around the inner rotor to maintain substantial alignment of the inner rotor with the pump housing and/or the pump shaft.

Abstract: A rotary fluid machine, such as a pump or motor has a housing with a spherical interior in which primary and secondary vanes rotate with the secondary vane reciprocating between open and closed positions with respect to the primary vane. Improvements to this type of fluid machine are defined to improve the rigidity of the internals while removing heat generated by compression as well as providing facile conversion of the machine from a liquid pump to a gas compressor, to provide for multiple flow streams at multiple flow rates in a single machine, multiple flow streams at multiple compression ratios in a single machine, and dual simultaneous function as a motor and a compressor.

Abstract: An electrically driven rotary piston machine which operates as a rotary piston pump or rotary piston compressor wherein the rotary piston machine has a basic housing, which holds an electrical coil and pump head, wherein the pump working space is preferably bounded by a trochoid toothing of the rotors. The pump head which can usually be manufactured relatively economically is embodied as a disposable part and therefore has a quick-action connection with the more complex basic housing.

Abstract: A vane pump of the intravane type for pumping hydraulic fluid, wherein each vane of the pump has two intravanes and that pressurized oil is provided to one or both intravane regions when the vane is in a rise region of the pump. The pump is operated such that the pressurized oil is provided to both undervane regions when the pump is running at low speed but the pressurized oil is provided to only one of the undervane regions when of the pump is running at high speed.

Abstract: According to one embodiment of the invention, a gerotor apparatus includes a first gerotor, a second gerotor, and a synchronizing system operable to synchronize a rotation of the first gerotor with a rotation of the second gerotor. The synchronizing system includes a cam plate coupled to the first gerotor, wherein the cam plate includes a plurality of cams, and an alignment plate coupled to the second gerotor. The alignment plate includes at least one alignment member, wherein the plurality of cams and the at least one alignment member interact to synchronize a rotation of the first gerotor with a rotation of the second gerotor.

Abstract: A screw compressor has a housing (22; 302) having first (53; 330) and second (58; 340) ports along a flowpath. A first rotor (26; 306) has a lobed body. A second rotor (28; 308, 310) has a lobed body enmeshed with the first rotor body. The rotors and housing cooperate to define a compression path between suction (60; 332) and discharge (62; 342) locations along the flowpath. Means (100, 110, 120; 200, 210, 220; 370, 380, 390) provide relative longitudinal movement between a blocking portion (57; 352) of the housing and at least one of the first rotor and second rotor between: a first condition wherein a pocket of the first and second rotors is closed by the blocking portion; and a second condition wherein the blocking portion does not close the pocket. To provide capacity control, a control system (110; 390) is configured to provide duty cycle control of the movement.

Abstract: A rotary vacuum pump includes a suction chamber (12) in a housing (10). A rotor (14) is eccentrically mounted in the suction chamber (12). Sliding vanes (18) are connected to the rotor (14). Further, a discharge channel (30) is connected to the suction chamber (12) and to an oil chamber (32). A valve (38) is disposed between the discharge channel (30) and the oil chamber (32) in order to prevent the medium from flowing back from the oil chamber (32) into the suction chamber (12). At least one compensating channel (50) is connected to the discharge channel (30) and to the oil chamber (32).

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

Abstract: Rotary components are described that include a housing comprising a rotor having a rotor working face and a gate having a gate working face and a pocket; at least one vane, wherein the vane is coupled to the rotor; at least one wiper coupled to the vane; a plurality of endplates coupled to the housing, wherein at least one of the endplates is a float plate; an intake chamber; and an outlet chamber. In addition, methods of aspirating a working medium by utilizing the rotary component having at least one float plate includes pulling the working medium into the intake chamber, depositing the working medium into a working chamber that is located between the intake chamber and the outlet chamber; maintaining the working medium in a stationary position until the vane sweeps around toward the outlet chamber; accumulating the working medium into the outlet channel of the outlet chamber; and centrifugally ejecting the working medium into the outlet chamber and out of the system.

Abstract: When a compressor is restarted at the time of occurrence of an inverter trip after a retry waiting time which is preliminarily set so as to lower a pressure on a discharge side of a main body of the compressor to a pressure where the main body of the compressor can be restarted elapses, conditions when the inverter trip occurs are detected and restarting is performed in accordance with the detected conditions after the retry waiting times which are different from each other elapse. There are provided two or more kinds of retry waiting times, and the retry waiting time immediately after starting is made shorter than the others. Accordingly, the present invention provides a control method and a control apparatus of an inverter compressor in which when a trip occurs immediately after the inverter is started, retry can be performed in a short time.

Abstract: An oil rotary vacuum pump of mechanical type (100) is filled with a requested amount of oil at the end of the manufacturing process, then it is stored and then shipped to the user, letting the user to avoid an operation of introducing the proper amount of oil into the pump. The oil leakage is prevented by securing the suction and/or exhaust ports (3, 17) of the pump, which are sealed by means of a removable sealing member, for instance by means of a membrane (21, 23).

Abstract: A dry pump comprises a stator housing a rotor assembly comprising intermeshing rotor components defining a running clearance with a surface of the stator, means for applying a transient magnetic force to at least one magnetic member of the rotor assembly to move the rotor components away from the stator surface and increase the size of the running clearance to reduce a frictional force applied to the rotor components by particulates accumulated within the running clearance, and means for moving the rotor components back towards the stator surface upon reduction of the magnetic force.

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

Abstract: A circular, reversible steam powered engine configured to force pistons mounted in circular housing assembly and coupled to a main shaft to create a work load. The steam powered engine is arranged to pipe steam of a high pressure into steam chambers to force pistons forward and push exhaust steam of a low pressure out of steam chambers. Gears rotate and engage with pistons to start and stop steam flow into timing valves and steam flow portions. The engine creates a torque required to effectively operate many types of loads, such as those for vehicle and equipment applications.

Abstract: By cutting-machining a side face of a scroll wrap with a non-rotational tool, swells in the perimeter direction have a smaller size. Thus, compressed gas is prevented from leaking between relatively slidable side faces of the respective wraps of the stationary scroll and the slewing scroll. This configuration provides a scroll compressor that has a higher accuracy and thus high compression efficiency and low noise are realized.

Abstract: A progressing cavity pump assembly includes a collar assembly connecting a housing and a tubing string, with the collar having an inside diameter upset and the rotor having a rotor head axially spaced from a rotor helix, with the rotor head having an outer diameter forming a stop adapted to land on the inside diameter upset. A method of timing a progressing cavity pump assembly includes providing a collar assembly having an inside diameter upset, movably connecting the collar assembly and the housing, providing a rotor having a rotor head axially spaced from a rotor helix, with the rotor head having an outer diameter forming a stop, selectively adjusting the relative position of the collar assembly and the housing to form a pathway substantially corresponding to the rotor helix, landing the stop on the inside diameter upset, and fixing the relative position of the collar assembly and the housing.

Abstract: Methods for controlling the net-displacement of a rotary fluid pressure device are disclosed. One of the net-displacement control methods (47) includes obtaining a desired input parameter (23) and a relative position (21) of a first member (43) and a second member (35) of a fluid displacement mechanism. A determination of a first and second output value is then made for each of a plurality of volume chambers (45) when the volume chambers (45) are supplied with fluid at fluid inlet and fluid outlet conditions, respectively. A total output value is then computed for each of a plurality of control valve configurations (63) and compared to the desired input parameter (23). The control valve configuration (63) with the total output value most similar to the desired input parameter (23) is then selected. A plurality of control valves (15) are then actuated in accordance with the selected control valve configuration (63).

Abstract: A variable displacement pump including a chamber volume varying mechanism including a moveable member, a first biasing member always biasing the moveable member in such a direction as to increase volumes of the working fluid chambers, and a second biasing member that is disposed with a set load and applies a biasing force to the moveable member in such a direction as to increase the volumes of the working fluid chambers when the moveable member is displaced against a biasing force of the first biasing member by a predetermined amount or more. The biasing force of the first biasing member is set such that before the moveable member is displaced against the biasing force of the first biasing member, the valve timing control device is shifted to a release state in which an open-and-closure timing of an engine valve is variably controlled.

Abstract: A scroll compressor may incorporate controlled bending of a scroll member to compensate for axial deformations that can occur between the scroll members. The controlled bending may be through the use of fluid pressure in a sealed chamber that communicates with a surface of the scroll member opposite the intermeshing wraps. Fluid passageways can extend through the scroll member between the sealed chamber and the intermeshing wraps. The controlled bending can increase the uniformity of the contact between the scroll members and improve the efficiency of the compressing operation.

Abstract: A pump is disclosed, having a pumping chamber in the rotor. The rotor is rotatable between first, second, third and fourth positions. When the rotor is in the first position, an inlet cam assembly displaces a piston to draw fluid into the pumping chamber via a first housing inlet. When the rotor is in the second position, an outlet cam assembly displaces the piston to expel fluid out of the pumping chamber via a first housing outlet. When the rotor is in the third position, the inlet cam lobe assembly displaces the piston to draw fluid into the pumping chamber via a second housing inlet. When the rotor is in the fourth position, the outlet cam assembly displaces the piston to expel fluid out of the pumping chamber via a second housing outlet. A method of pumping fluid is also disclosed.

Abstract: Vane pump (10) mechanical losses are reduced by removing vane friction losses and replacing them with lower magnitude journal bearing fluid film viscous drag losses. A freely rotating cam ring (70) is supported by a journal bearing (80). A relatively low sliding velocity is imposed between the cam ring and the vanes (26). This permits the use of less expensive and less brittle materials in the pump by allowing the pump to operate at much higher speeds without concern for exceeding vane tip velocity limits.

Abstract: The invention relates to a vane-type machine. The housing has a largely cylindrical space for accommodating the vane cells and an inlet opening and an outlet opening. A shaft is eccentrically arranged in the housing. A first and a second guide plate arranged largely parallel to one another are provided on the shaft. Slides displaceable largely radially to the shaft in the direction of the inner wall of the housing are guided by the guide plates, wherein a vane cell is formed with the participation of two respective adjacent slides of the adjacent region of the inner wall of the housing and the volume of the vane cells in the region of the inlet opening differs from the volume of the vane cells in the region of the outlet opening.

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

Abstract: The present invention relates to a screw compressor and a method for operating the compressor primarily for gaseous refrigerants, comprising a compressor housing, which comprises a male and a female screw rotor arranged in screw rotor bores in the compressor housing, which male and female rotor are co-rotatingly drivable and interacting for compressing the refrigerant, which screw compressor comprises at least one slider, which slider is movable in relation to the male and the female rotor, where movement of the slider controls the internal volume ratio of the screw compressor, which slider is moveable in a slider housing, which slider is in a direction sideways to the plane formed by the rotational axes of the male and the female rotor, which slider is interacting with the male and the female rotor. It is the object of the invention to develop a highly effective screw compressor, which screw compressor can regulate the discharge pressure.

Abstract: A gas vane pump wherein a lubricant is intermittently introduced into a housing 10 during rotation of a rotor 40, through a lubricant supply passage 100 formed through the housing and the rotor, and the relative position between the rotor having a diametric hole 112 and the housing having a communication groove 130 is determined such that when the rotor 40 is placed at an angular position which is in the middle of a predetermined angular range relative to the housing 10 and in which the hole 112 is in communication with the groove 130, a point of contact between a vane 70 movably held by the rotor and the inner circumferential surface of the housing 10 is located at the lowest position of the inner circumferential surface, so that when the rotor 40 is stopped at an angular position within the predetermined angular range, the vane 70 divides the remaining lubricant mass into two portions, which are discharged at respective two different times one after the other, making it possible to reduce the load acting on