Class / Patent application number | Description | Number of patent applications / Date published |
418005000 | MULTISTAGE | 67 |
20080226480 | Multi-Stage Trochoidal Vacuum Pump - A vacuum pump includes first, second, third and fourth pump stages. Each pump stage has a trochoidal-shaped cavity and a rotor that rotates within the respective cavity. Each cavity has a volume determined by the depth of the cavity and a generally corresponding thickness of the rotor. The fourth stage has a largest volume and receives gas at an input pressure. The fourth stage outputs the gas to the third stage at a second pressure higher than the input pressure. The cavity of each successive stage (third, second and first) has a smaller volume and outputs the gas at a higher pressure than the previous stage. The last (first) stage outputs the gas to the atmosphere. The rotors in the stages rotate about a common pump shaft. Each rotor has a multiple vertices that follow the inner perimeter surface of the respective cavity without contact and without requiring additional seals. | 09-18-2008 |
20090104060 | COMPRESSOR - In a compressor provided with two compression mechanisms of a rotary type compression mechanism and a scroll type compression mechanism, torque fluctuations are reduced. The compressor | 04-23-2009 |
20090175748 | Multi-stage compressor unit for refrigeration system - A multi-stage compressor unit for a refrigeration system configured to circulate a refrigerant comprises a first compressor sub-unit having a first stage and a second stage, and a second compressor sub-unit in parallel with the first compressor sub-unit and having a first stage. The first and second stages of the first compressor sub-unit each have a suction port and a discharge port. The first compressor sub-unit is configured to receive and compress a first portion of the refrigerant from an evaporator. The first stage of the second compressor sub-unit is configured to compress a second portion of the refrigerant. | 07-09-2009 |
20100143172 | Multistage Compressor - A multistage compressor employing a gas injection system for CO | 06-10-2010 |
20110070115 | TWO-STAGE ROTARY EXPANDER, EXPANDER-INTEGRATED COMPRESSOR, AND REFRIGERATION CYCLE APPARATUS - An expander-integrated compressor ( | 03-24-2011 |
20110110810 | COMPRESSION APPARATUS WITH VARIABLE SPEED SCREW AND METHOD - An apparatus is provided for compressing a loose solid feedstock. The apparatus includes a two stage compressor. The first compression stage is a screw compressor. The second compressor stage is a reciprocating compressor. The reciprocating compressor operates co-axially with, and receives its feed from, the screw compressor. A choke cone maintains pressure in the outfeed from the compressor stages. The reciprocating compressor, the screw compressor, and the choke cone are all adjustable in real time to control the compression of the feedstock according to a pre-programmed schedule that need not have equal compression and retraction strokes. The operation of the screw compressor may be advanced or eased off depending on the motion of the reciprocating compressor. The operation of the choke cone may be actively controlled to obtain a coordination with the compressor stages. | 05-12-2011 |
20110150683 | ROTARY COMPRESSOR - A twin rotary compressor is provided. In the twin rotary compressor, a refrigerant suction pipe may be connected to a middle plate positioned between a first cylinder and a second cylinder to reduce a height of the first cylinder, so that heights of a first rolling piston and a first vane may also be lowered. This may allow a contact area between the first rolling piston and the first vane to be decreased so as to reduce refrigerant leakage from a first compression space of the first cylinder, resulting in improvement of compression efficiency of the compressor. | 06-23-2011 |
20110165004 | ROTARY-TYPE 2-STAGE COMPRESSOR - The present invention provides a 2-stage rotary compressor which includes a hermetic container, a rotating shaft provided in the hermetic container and transferring a rotation force, a low pressure compression assembly including a low pressure roller eccentrically rotated around the center of the rotating shaft, a low pressure cylinder accommodating the low pressure roller, and a low pressure vane partitioning the inner space of the low pressure cylinder, a high pressure compression assembly including a high pressure roller eccentrically rotated around the center of the rotating shaft, a high pressure cylinder accommodating the high pressure roller, and a high pressure vane partitioning the inner space of the high pressure cylinder, a connection pipe providing a passage so that the refrigerant compressed in the low pressure compression assembly can be introduced into the high pressure compression assembly, and an injection pipe connected to the connection pipe. The inner diameter of a middle portion of the connection pipe is greater than the inner diameters of both end portions of the connection pipe. | 07-07-2011 |
20110256007 | Three stage scroll vacuum pump - A three stage vacuum pump has three stages of fixed scrolls and orbiting scrolls that operate simultaneously. A motor drives the second orbiting scroll within the third fixed scroll upon three equally spaced idlers. One idler then transmits rotation and torque into the second stage. The second orbiting scroll to has involutes upon both surfaces to engage the second fixed scroll inwardly and the first fixed scroll outwardly. The first fixed scroll has fins upon its back that extend into the atmosphere to transfer heat to air cool the invention. This pump also has a fan accelerating heat transfer. The pump operates the scrolls directly from a motor or from a motor and magnetic coupling so that the atmosphere does not infiltrate the pump. | 10-20-2011 |
20120189478 | VACUUM PUMP SYSTEM - A vacuum pump system comprises two vacuum pumps which are connected to each other. In order to create vacuum pump system of a more compact size, the connection between the two vacuum pumps is performed via connection elements directly attached to the pump housing and forming connection sites, and the outlet flange of the upper pump is placed directly on the inlet flange of the lower pump without thereby causing a transmission of larger forces or moments. | 07-26-2012 |
20120189479 | SPHERICAL EXPANSION COMPRESSOR ADAPTED TO VARIABLE WORKING CONDITIONS - A spherical expansion compressor adapted to variable working conditions with a spherical inner chamber, comprises a rolling rotor compressor used as first-stage compression, compression working chambers, expansion working chambers, a gas tank and a pressure control circuit. The pressure control circuit is arranged between the gas tank and a pressure-controlled inlet valve of the rolling rotor compressor, and controls the inlet valve to open/close according to the pressure in the gas tank. When the pressure in the gas tank exceeds a set value, the pressure-controlled inlet valve is closed by the pressure control circuit. When the pressure in the gas tank returns to the set value, the pressure-controlled inlet valve is opened and the rolling rotor compressor works normally. Working medium after first-stage compression enters the gas tank, the pressure in the tank maintains constant through the regulation of the pressure control circuit. Working medium with constant pressure enters second-stage compression, and then expands in the expansion-stage, thereby forming the spherical expansion compressor adapted to variable working conditions. | 07-26-2012 |
20120275945 | VANE PUMP - A vane cell pump having an over vane pump associated with a first consumer and an under vane pump including an under vane pressure area and an under vane suction area which is connected to the over vane pump. The under vane pressure area is separated from the under vane suction area and is associated with a second consumer. | 11-01-2012 |
20130309113 | Multiple Stage Passive Variable Displacement Vane Pump - The present invention is a multiple stage variable displacement vane pump comprising a pressure regulating spring guide. A first spring and a second spring may be controlled by said pressure regulating spring guide. The present invention does not require a solenoid or electronic control. Control of flow and speed is achieved through operable of the pressure regulating spring guide that causes the first spring and second spring to be operable in relation to one another, but for the first spring and the second spring to be operable independently of each other. The springs may be positioned to be inline in relation to each other. Rotation of a slide and pressure exerted thereby upon the pressure regulating spring guide may create a first spring regulation stage and a second spring regulation stage. | 11-21-2013 |
20130315765 | Three stage scroll vacuum pump - A three stage vacuum pump has three stages of fixed scrolls and orbiting scrolls that operate simultaneously. A motor drives the second orbiting scroll within the third fixed scroll upon three equally spaced idlers. One idler then transmits rotation and torque into the second stage. The second orbiting scroll has involutes upon both surfaces to engage the second fixed scroll inwardly and the first fixed scroll outwardly. The first fixed scroll has fins upon its back that extend into the atmosphere to transfer heat to air cool the pump. This pump also has a fan accelerating heat transfer. The pump operates the scrolls directly from a motor or from a motor and magnetic coupling so that the atmosphere does not infiltrate the pump. | 11-28-2013 |
20140105774 | HERMETIC COMPRESSOR - A hermetic compressor is provided that may include a fluid guide disposed in an inner space of an intermediate chamber, so as to guide oil, discharged from a first compression chamber of a first compression device into the inner space of the intermediate chamber, to a second compression chamber of a second compression device without remaining in the inner space of the intermediate chamber, whereby noise generated due to an excessive amount of oil remaining in the inner space of the intermediate chamber may be reduced, and simultaneously a shortage of oil in the second compression device may be prevented. | 04-17-2014 |
20140205482 | MULTI-STAGE VACUUM PUMP OF THE DRY PUMP TYPE - A multi-stage vacuum pump of the dry pump type is disclosed. The multi-stage vacuum pump includes a plurality of pumping stages each respectively having an inlet and an outlet, the pumping stages being mounted in series between a suction port and a discharge port of the vacuum pump, characterized in that the vacuum pump also includes at least one valve configured to dump pressure from a pumping stage, said valve being arranged in the upper part of the vacuum pump, on the same side as the inlet of the pumping stage. | 07-24-2014 |
20140286806 | MULTI-STAGE VACUUM PUMP - A multi-stage vacuum pump may include a sealing arrangement for sealing between the stator components of the pump. The end seals of the arrangement comprise an annular portion for sealing between end stator components and shell components and axial portions which extend from the annular portion and together with separate axial seals seal between the shell components. | 09-25-2014 |
20140294640 | Scroll Pump Having Separable Orbiting Plate Scroll and Method of Replacing Tip Seal - A scroll pump facilitates the installation of a new tip seal between an axial end of the scroll blade of one of inner stationary and orbiting plate scrolls of the pump and the plate of the other of the inner stationary plate and orbiting plate scrolls. To this end, the orbiting plate scroll has a central portion and an outer peripheral portion extending around and seated on the central portion. The outer peripheral portion of the orbiting plate scroll is keyed to and/or fastened to the central portion such that the outer peripheral portion on is not rotatable relative to the central portion and yet is axially removable from the central portion. The tip seal can be readily accessed and replaced by removing the outer peripheral portion of the orbiting scroll plate from the central portion. | 10-02-2014 |
20150037184 | DOUBLE-ENDED SCROLL COMPRESSOR LUBRICATION OF ONE ORBITING SCROLL BEARING VIA CRANKSHAFT OIL GALLERY FROM ANOTHER ORBITING SCROLL BEARING - A scroll compressor orbiting scroll bearing lubrication system includes a scroll compressor crankshaft having a lubricating fluid gallery extending therethrough between a first stage orbiting scroll and a second stage orbiting scroll. The first stage employs an orbiting scroll radial bearing and an orbiting scroll hydrodynamic thrust bearing, while the second stage employs an orbiting scroll radial bearing and an orbiting scroll hydrostatic thrust bearing. Lubricating fluid is supplied to the second stage orbiting scroll radial bearing via the lubricating fluid gallery. | 02-05-2015 |
20150037185 | ORBITING CRANKSHAFT DRIVE PIN AND ASSOCIATED DRIVE PIN SLEEVE GEOMETRY - A compressor crankshaft assembly includes a crankshaft and an eccentric drive pin extending from one end of the crankshaft. The shape of the drive pin viewed into the exposed end of the drive pin is defined by the intersection of a first cylinder that is coaxial with the axis of a substantially cylindrical orbital bearing journaled and installed to receive the eccentric drive pin and a second cylinder that is coaxial with the axis of a substantially cylindrical main bearing journaled and installed to rotatably receive the crankshaft, such that the area defined by the intersecting portion is less than the area defined by either cylinder. | 02-05-2015 |
20150037186 | STRUCTURE FOR STABILIZING AN ORBITING SCROLL IN A SCROLL COMPRESSOR - A scroll compressor includes one or more stage of compression disposed within a compressor housing. One or more of the stages includes a stationary scroll member including a base and a generally spiral wrap extending from the base of the stationary scroll member. One or more of the stages further includes an orbiting, scroll member including a substantially circular base and a substantially spiral wrap extending from the base of the orbiting scroll member. A coupling is disposed between the first scroll member base and the second scroll member base and in surrounding relationship to the first and second scroll member spiral wraps. At least one stabilizing pad is disposed between the first scroll member base and the second scroll member base and in axial thrust force relationship with the coupling to at least partially prevent tipping of the second scroll member. | 02-05-2015 |
20150118087 | MULTISTAGE OIL PUMP - A conventional multistage oil pump, wherein the components are formed of a ferrous material, and thus, there have been presented a problem that the weight is large. The multistage oil pump and rotors are connected in a series, wherein a rotor case, a first rotor case and a second rotor case are connected in the axial direction, and the inside thereof is partitioned by a spacer. The first rotor case and the second rotor case are jointed to the spacer with dowel pins. The rotors are formed of a ferrous material, while the spacer being formed of an aluminum-based material. | 04-30-2015 |
418007000 | Successive stages alternately produce work | 1 |
20080206082 | CLOSED COMPRESSOR AND REFRIGERATING CYCLE APPARATUS - A closed compressor includes a closed case in which a plurality of compression mechanism sections are accommodated, the compression mechanism section having a cylinder including a cylinder chamber eccentrically rotatably accommodating a roller, the compression mechanism section including a blade having a leading edge to divide the cylinder chamber into two parts along a direction in which the roller rotates, the compressor including a high-pressure refrigerant introducing mechanism guiding a high-pressure refrigerant into the cylinder chamber and separating the blade from the roller, the compressor being configured to switch between a high-capacity operation in which all the compression mechanism sections perform a compression operation and a low-capacity operation in which the blade in the compression mechanism section is separated from the roller and thus prevented from performing the compression operation, the high-pressure refrigerant introducing mechanism including a high-pressure refrigerant storage section storing the high-pressure refrigerant. | 08-28-2008 |
418008000 | Working fluid engages working member serially in circumferentially spaced working chambers | 1 |
20120020823 | ROTATING AND RECIPROCATING PISTON DEVICE - The present document describes a rotating and reciprocating piston device comprising: chambers disposed about a chamber axis, the chambers having two ends and a port for passage of a fluid at each one of the ends of the chambers; pistons having two ends, each one of the pistons slidably positioned within a respective one of the chambers thereby determining a space at either end of each piston within its respective chamber; and a track forming a closed circuit through which the chamber axis passes, the track for determining a position of a piston within its respective chamber and hence the space on either side thereof. | 01-26-2012 |
418009000 | Interengaging rotary members | 30 |
20080199338 | Multistage compression type rotary compressor - An object is to provide a high inner pressure type multistage compression rotary compressor capable of avoiding beforehand generation of vane fly of a second rotary compression element and realizing a stabilized operation, the rotary compressor includes a communication path which connects an intermediate pressure region to a region having a low pressure as a suction pressure of a first rotary compression element; and a valve device which opens or closes this communication path, the rotary compressor applies a high pressure as a back pressure of an upper vane, and this valve device opens the communication path in a case where a pressure difference between the intermediate pressure and the low pressure increases a predetermined upper limit value before the intermediate pressure reaches the high pressure. | 08-21-2008 |
20080240953 | ROTARY COMPRESSOR UNIT AND METHOD OF CONTROLLING OPERATION THEREOF - The compressor unit having at least two compressors, for example a low pressure stage compressor | 10-02-2008 |
20090004036 | Helical Screw Compressor - A screw compressor with two rotors held in a rotor housing has sealing arrangements | 01-01-2009 |
20090123314 | OIL PUMP FOR AN INTERNAL COMBUSTION ENGINE - An oil pump for an internal combustion engine for drawing up the lubricating oil situated in an oil collector device has an oil pump housing wherein at least two pairs of gears are disposed. The pairs of gears, in order to form the pumping stages, are connected on the suction side to a suction passage formed in the oil pump housing and on the delivery side to a delivery passage. The oil pump housing is further formed with an oil supply passage that is connected to the suction passage of a first pumping stage and via which lubricating oil can be delivered to the suction side of the first pumping stage. | 05-14-2009 |
20090191078 | LUBRICATING PUMP - A lubricating pump having a first stage and a second stage; the first stage in turn has an intake connectable hydraulically to a tank of lubricating fluid, and a delivery outlet connectable hydraulically to a lubricated member; the first stage compresses the lubricating fluid from the tank to a pressure for supply to the member; the second stage in turn has an inlet connectable hydraulically to a casing housing the member, and an outlet connectable hydraulically to the tank; the second stage feeds the lubricating fluid in the casing back into the tank; the second stage is a Roots type, and has a first and a second rotor rotating about respective axes to feed the lubricating fluid from the inlet to the outlet; and the first and second rotor are operated by the first stage. | 07-30-2009 |
20090246054 | Three-Stage Screw Compressor - The invention relates to a multi step helical screw compressor unit which consists of a drive housing ( | 10-01-2009 |
20100150760 | ROTARY VACUUM PUMP - The rotary vacuum pump includes a pump housing, a rotary shaft, a thrust movement restriction mechanism and a first elastic member. The pump housing has therein a pump chamber. The rotary shaft has thereon a rotor rotatably disposed in the pump chamber. When the rotor is rotated with the rotary shaft, gas in the pump chamber is pumped thereby to draw gas into the pump chamber. The thrust movement restriction mechanism is provided for allowing the rotor to displace in the pump chamber in one thrust direction due to thermal expansion thereof during the operation of the rotary vacuum pump. The first elastic member is provided for urging the rotary shaft in the other thrust direction opposite to the one thrust direction. | 06-17-2010 |
20100158728 | Vacuum pump - A multistage vacuum pump comprises a stator housing a multistage rotor assembly, each stage comprising inter-meshing Roots rotor components, wherein the tip radius of the rotor components at an inlet stage of the pump is larger than the tip radius of the rotor components at an exhaust stage of the pump. | 06-24-2010 |
20100189583 | DRY VACUUM PUMP INCLUDING A LUBRICATING FLUID SEALING DEVICE AND A CENTRIFUGE ELEMENT EQUIPPING SUCH A DEVICE - The invention pertains to a dry vacuum pump comprising at least one rotating shaft ( | 07-29-2010 |
20100232999 | Seal - A vacuum pump comprises two stator components ( | 09-16-2010 |
20100266433 | MULTI-STAGE DRY PUMP - A multi-stage dry pump includes: a plurality of pump chambers each including a cylinder and a rotor housed in the cylinder; a first rotor shaft that is a rotation shaft of the rotors; a fixed bearing that rotatably supports the first rotor shaft and restricts a movement thereof along an axis direction of the first rotor shaft; and a free bearing that rotatably supports the first rotor shaft and permits a movement thereof along the axis direction of the first rotor shaft; wherein: the plurality of pump chambers is disposed between the fixed bearing and the free bearing; and a first pump chamber of the plurality of pump chambers which has a lower pressure and on the aspiration side is placed in proximity to the fixed bearing. | 10-21-2010 |
20100303658 | Water-Cooled Oil-Free Air Compressor - A water-cooled oil-free air compressor which features compactness and ensures improved productivity and maintainability. The compressor is an oil-free screw compressor which includes a low pressure stage compressor body, an intercooler for water-cooling the compressed air discharged from the low pressure stage compressor body, a high pressure stage compressor body for further compressing the compressed air cooled by the intercooler, and an aftercooler for water-cooling the air discharged from the high pressure stage compressor body. The intercooler and aftercooler each have a plurality of units, all of which are almost equal in shape. A cooler header on each or either of the inlet and outlet sides for compressed air is shared by the units of each cooler. | 12-02-2010 |
20110194961 | DRY PUMP - A dry pump includes: a plurality of cylinders; a pump chamber formed in each of the cylinders; a division wall separating pump chambers adjacent to each other; a plurality of rotors contained inside pump chambers; a rotating shaft that serves as an axis of rotation of the rotor; and a cooling medium path which is formed inside the division wall and through which a cooling medium passes. | 08-11-2011 |
20120014825 | ROOTS TYPE FLUID MACHINE - A roots type fluid machine includes a case having a side wall, a pair of rotary shafts provided in the case, a pair of rotors engaged with each other and fixed to the pair of rotary shafts so as to extend axially, respectively, a suction space formed by the case and the pair of rotors for introducing fluid, a discharge space formed by the case for discharging fluid and the pair of rotors and a transfer chamber formed by the case and the rotor. The rotor has a rotor end surface. A clearance is formed between the side wall and the rotor end surface. The transfer chamber transfers gas introduced in the suction space to the discharge space in accordance with the rotation of the pair of rotors. The case has a guide groove formed in the side wall facing the rotor end surface. Gas leaked from the discharge space into the clearance is introduced to the transfer chamber through the guide groove. | 01-19-2012 |
20120039733 | ROTARY PISTON STEAM ENGINE WITH BALANCED ROTARY VARIABLE INLET-CUT- OFF VALVE AND SECONDARY EXPANSION WITHOUT BACK-PRESSURE ON PRIMARY EXPANSION - Rotary piston steam engine with equal double rotary pistons is provided with a balanced rotary variable inlet cut-off valve for enhanced efficiency. The exhaust steam from the primary expansion is routed to secondary expansion avoiding back pressure for additional efficiency. The rotary valve has balanced dual inputs and outputs on opposite sides. The exhaust steam from the primary expansion is taken off when the trailing face of the rotary piston passes the inlet port of the expansion chamber housing, the exhaust outlet secondary expansion being placed approximately 180 degrees from the primary expansion inlet in the curved portion of the expansion chamber housing wherein back pressure is not imparted to the primary expansion. | 02-16-2012 |
20130129548 | TWO-STAGE MEDIUM-PRESSURE SCREW-TYPE AIR COMPRESSOR SET - A two-stage medium-pressure screw air compressor comprises a primary screw compressor ( | 05-23-2013 |
20140093412 | VACUUM PUMP STATORS AND VACUUM PUMPS - Combined booster and primary pump arrangements can be bulky and require separate supplies of purge gas and cooling water. In order to overcome this problem invention provides a vacuum pump in which two or more pumping mechanisms, i.e. the booster pump and main pump, are housed in the same stator. The invention further provides a vacuum pump stator comprising at least two operatively interconnected cavities, wherein at least two of the cavities each comprise at least one rotor-receiving portion shaped to receive two or more at least partially intermeshing rotors, and wherein an axis of a rotor-receiving portion of a first one of the cavities is offset with respect to an axis of a rotor-receiving portion of a second one of the cavities. | 04-03-2014 |
20140112814 | VACUUM PUMP - A vacuum pump ( | 04-24-2014 |
20140112815 | VACUUM PUMP - A vacuum pump ( | 04-24-2014 |
20140161655 | PUMP | 06-12-2014 |
20140205483 | ROOTS PUMP - A Roots pump comprises a plurality of multi-toothed rotary pumps, each forming a pump stage, and connection channels connecting respective adjacent pump stages. The invention provides that the connection channels are arranged in partitioning walls separating the adjacent pump stages. | 07-24-2014 |
20150037187 | Pump - The present invention relates to a multi-stage vacuum pump which has a plurality of pumping stages. The pump comprises a stator forming the pumping chambers of respective pumping stages and at least one shaft, for supporting a plurality of rotors for rotation in respective pumping chambers. The stator comprises: a stator envelope which extends over an axial extent of a plurality of stator stages thereby circumscribing said at least one shaft and forming an internal profile of a plurality of stator stages: and a plurality of transverse walls located on either axial side of the stator stages to form respective said pumping chambers. At least one of the transverse walls is an inter-stage between stator stages and the stator envelope is configured to circumscribe the inter-stage for location of said inter-stage radially inward of the stator part. | 02-05-2015 |
20150308430 | VACUUM PUMP - A multi-stage vacuum pump comprising: first and second half-shell stator components defining a plurality of pumping chambers and for assembly together along respective longitudinally extending faces; first and second end stator components for assembly at respective longitudinal end faces of the first and second half-shell stator components; gaskets for sealing between the first and second half-shell stator components when assembled together at the longitudinally extending faces; and O-rings for sealing between the first and second end stator components and the first and second half-shell stator components when assembled; wherein annular channels intersect longitudinal recesses and each longitudinal recess comprises a stop fixed relative to the intersection, and the gasket and the longitudinal recess are configured that when the gasket is located in the recess during assembly the gasket is biased against the stop for locating an end portion of the gasket relative to the intersection. | 10-29-2015 |
20150361984 | Air Compressor - Provided is an air compressor which exhibits improved reliability by resolving problems relating to drainage discharge defects, and exhibits improved energy efficiency. The air compressor comprises: a compressor body which compresses air; a compressed air flow path through which the compressed air from the compressor body flows; a heat exchanger which is provided to the compressor flow path so as to cool the compressed air from the compressor body; and a drainage pipe ( | 12-17-2015 |
20150377235 | TWO STAGE PUMP, PARTICULARLY PROVIDED AS MAIN PUMP FOR SUPPLYING AN AIRCRAFT ENGINE WITH FUEL - A two stage pump ( | 12-31-2015 |
20160040669 | TWO-SHAFT ROTARY PUMP - Provided is a two-shaft rotary pump which is capable of improving reliability and operation efficiency by preventing an exhaust gas from flowing backward into a pump as much as possible, preventing the interior of the pump form being excessively compressed as much as possible, and suppressing temperature rise in the pump. A two-shaft rotary pump in which two rotating shafts ( | 02-11-2016 |
20160123323 | FLUID PUMP - A fluid pump includes a housing, a rotary shaft, and pump units which are contained in the housing and sucks in, pressurizes, and discharges fluid with being rotationally driven by the rotary shaft. The housing has a suction passage conducting the fluid from a suction port to the pump unit, a discharge passage conducting the fluid from the pump unit to a discharge port, a return passage returning a portion of the fluid flowing through the discharge passage to an upstream side of the pump unit, and a control valve controlling a flow of the returned fluid. The return passage is formed so as to conduct the returned fluid in the same direction as a flow of a sucked fluid flowing through the suction passage to make the returned fluid flow together with the sucked fluid. | 05-05-2016 |
20160160858 | OIL PUMP - A fluid pump system for an engine includes a transmission acting as a first pump and a second pump. In one embodiment, the first pump is a scavenge pump and the second pump is a pressure pump with the transmission being a gear set for altering a drive ratio between a transmission input drive and an input drive of the second pump, thereby allowing additional control of a speed of the second pump in comparison to the engine. The transmission, acting as a scavenge pump, can provide a scavenge pump function to an oil pan of the engine, returning engine oil that is present there from both normal drain back and acceleration/deceleration forces. | 06-09-2016 |
418010000 | Three or more | 2 |
20110318210 | VACUUM PUMP - A multistage vacuum pump includes a stator housing a multistage rotor assembly, each stage having intermeshing Roots rotor components, wherein the tip radius of the rotor components at an inlet stage of the pump is larger than the tip radius of the rotor components at an exhaust stage of the pump, wherein a meshing clearance between the rotor components at the inlet stage of the pump is greater than a meshing clearance between the rotor components at the exhaust stage of the pump. | 12-29-2011 |
20130011285 | THREE-STAGE SCREW COMPRESSOR - A multi-staged screw compressor system includes a gearbox, a drive gear located in the gearbox, and a first, second and third screw compressor that are fastened to the gearbox and coupled to the drive gear such that the first, second, and third screw compressors are all driven in common by the drive gear. During operation the first screw compressor compresses a flow of gaseous fluid from an inlet pressure to a first intermediate pressure, the second screw compressor compresses the flow of fluid from the first intermediate pressure to a second intermediate pressure, and the third screw compressor compresses the flow of fluid from the second intermediate pressure to a final pressure. The final pressure is at least thirty times the inlet pressure. | 01-10-2013 |
418011000 | Sliding abutment | 3 |
20080213116 | Multi-Stage Rotary Compressor - A multi-stage rotary compressor comprises: a casing having a sealed space therein; a driving unit installed in the casing, for generating a driving force; a first compression unit and a second compression unit for receiving the driving force from the driving unit and compressing a refrigerant; and a connection unit for connecting the first and second compression units and guiding the refrigerant discharged from the second compression unit to be sucked directly in the first compression unit and then re-compressed, by which it is possible to vary capacity, even using every plurality of compression units, and to obtain power saving effect suitable for a saving mode. | 09-04-2008 |
20100111737 | COMPRESSOR - A compressor includes a compression mechanism having two opposed end plates, a fixed member disposed between the two end plates, a movable member disposed between the two end plates, a bypass passage, and an opener/closer. The movable member is arranged to eccentrically move about a predetermined rotational axis to compress refrigerant in a compression chamber formed between the fixed member and the movable member. The bypass passageway has an upstream end opened to the compression chamber through which refrigerant is partially ejected from the compression chamber so as to be returned to a suction side of the compression mechanism. The cross section of the upstream end of the bypass passage is preferably elongated circumferentially about the rotational axis. The compression mechanism may include a plurality of bypass passages and a plurality of openers/closers. | 05-06-2010 |
20100158729 | ROTARY EXPANDER - A rotary expander includes: a cylinder ( | 06-24-2010 |
418012000 | Swinging abutment | 1 |
20120224989 | Pivoting, Hinged Arc Vane Rotary Compressor Or Expander - A rotary compressor or expander include a cylindrical housing chamber, a rotatable cylindrical rotor mounted eccentrically with respect to housing chamber centre, a cylindrical rotor liner free to move around the rotor, and a pivoting generally circular arc vane hinged to the rotor liner. Cavity or buckets engraved to the outer surface of the rotor liner together with corresponding inlet nozzle flow provide additional momentum impulse transfer from working fluid to expander eccentric rotor. The inlet of the rotary expander is equipped with a rotating valve synchronous to the eccentric rotor, regulating the admission time and duration of the entering working fluid. The exhaust of the rotary compressor is equipped with either a check valve or a rotating valve synchronising the fluid discharge time and duration. | 09-06-2012 |
418013000 | Sliding vane | 9 |
20080240954 | Rotary compressor - There is provided a two-stage compression rotary compressor in which the balancer mass of a rotor can be made as small as possible, and the moments that tilt the whole of a shaft can be balanced. The axial length L | 10-02-2008 |
20090035166 | TWO-STAGE ROTARY COMPRESSOR - A two-stage rotary compressor having a compression mechanism including a single muffler housing member. The single muffler housing member at least partially defines an intermediate pressure discharge cavity and a discharge pressure discharge cavity. In one exemplary embodiment, the compression mechanism includes a cylinder block having a plurality of vanes positioned within slots formed in an inner cylindrical surface of the cylinder block. The slots are in fluid communication with the discharge pressure discharge cavity and receive discharge pressure working fluid to bias the vanes radially inwardly. In another exemplary embodiment, the cylinder block includes a plurality of passages for the delivery of working fluid to and from the cylinder block. | 02-05-2009 |
20090110577 | VARIABLE DELIVERY VANE OIL PUMP, IN PARTICULAR FOR OIL - A variable delivery vane pump, in particular for oil, is provided with a stator ( | 04-30-2009 |
20100189584 | 2 STAGE ROTARY COMPRESSOR - The present invention provides a 2 stage rotary compressor including a hermetic container ( | 07-29-2010 |
20110058970 | ROTARY COMPRESSOR AND METHOD - An aspect of the present disclosure involves a rotary compressor that is primarily optimized for use without the need for liquid lubricants, such as in the flow path of the fluid being compressed, and is efficient and quiet to use. The compressors described herein are efficient, run quietly, use less power, and last longer than those previously known in the art. The compressors are useful for medical applications and other clean gas applications, for instance, where lubricants could contaminate the fluid being compressed and/or increased noise and/or vibration may be problematic. | 03-10-2011 |
20120263614 | HOUSINGLESS POSITIVE DISPLACEMENT PUMP ASSEMBLY - Housingless positive displacement pump assembly comprises one or more vane or gerotor type housingless positive displacement pump units, each comprising pump unit components. One or more retaining rods extend through axially aligned holes in a mounting flange at one end of the pump assembly and the pump unit components to hold the pump unit components in stacked relation to one another and connect the pump assembly to the mounting flange. | 10-18-2012 |
20140023538 | VANE ROTARY COMPRESSOR - Disclosed herein is a vane rotary compressor in which a fluid such as a refrigerant is compressed, with the volume of a compression chamber being reduced during the rotation of a rotor. In addition, disclosed is a vane rotary compressor having a configuration such that a space between a cylinder and a housing is divided into a high-pressure chamber, from which a high-pressure refrigerant is discharged, and an oil storage chamber in which oil included in the refrigerant is separated and stored, and having an oil decompression structure using a gap between a rotor and a head portion. | 01-23-2014 |
20140119968 | ROTARY COMPRESSOR - A rotary compressor includes a compression unit that includes an annular cylinder including a cylinder inner wall, a suction port, and a vane groove, an end plate covering an end portion of the cylinder, an annular piston revolving in the cylinder to form an actuation chamber between the cylinder inner wall and the annular piston; and a vane protruding into the actuation chamber to divide the actuation chamber into a suction chamber and a compression chamber. A discharge port, which is provided in the end plate near the vane groove, communicates with the compression chamber, and a discharge groove, which is provided in the cylinder inner wall near the vane groove, communicates the compression chamber with the discharge port, and one side end portion of the discharge groove is located in an end portion of a wall portion of the vane groove on the compression chamber side. | 05-01-2014 |
20150037188 | VANE PUMP ASSEMBLY - An improved vane pump assembly is provided. The vane pump assembly includes a housing with an open chamber that is circular in shape when viewed in cross-section and has an inner wall that surrounds the open chamber. A rotor is rotatably disposed in the open chamber of the housing. As with the open chamber, the rotor is circular in shape when viewed in cross-section and has a diameter. The rotor further has at least one through-passage which extends diametrically across the rotor. The rotor is positioned such that it has a center that is offset from a center of the circular open chamber of the housing. | 02-05-2015 |