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| Number | Title | Issue Date |
| 8147231 | Screw compressor having rotor casing with removable discharge opening neighborhood portion A screw compressor includes a pair of male and female screw rotors which meshes with each other, where a casing storing the pair of screw rotors is divided into a discharge opening neighborhood portion including at least a discharge opening and an other portion othe... | 04/03/2012 |
| 7862315 | Screw displacement pump A screw displacement pump is provided. The screw displacement pump is of single-entry, double-shaft construction with an external bearing of the two screw shafts. A pump housing encloses the screw shafts by forming feed chambers and externally delimiting the feed ch... | 01/04/2011 |
| 7828536 | Low-pressure screw compressor Low-pressure screw compressor provided with a rotor housing (2) with an inlet side and an outlet side, and enclosing two rotor bodies (3 and 4) including shafts (5, 7 respectively) and screws (6, 8 respectively) mounted on the shaf... | 11/09/2010 |
| 7819646 | Rotary piston vacuum pump with washing installation 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 in... | 10/26/2010 |
| 7766635 | Rotary pump having sinusoidal sealing lines A rotary pump has a housing composed of two intersecting cylinder sections and pump rotors therein. The rotors roll off on one another and against the interior wall of the housing in a sealing manner and have two approximately club-shaped sections that are connected... | 08/03/2010 |
| 7762799 | Oil-cooled screw compressor In an oil-cooled screw compressor comprising, a compressor body including a pair of a male rotor and a female rotor, a motor including a stator and a motor rotor connected to one of the male and female rotors, and an oil separator container for gathering the oil fro... | 07/27/2010 |
| 7722346 | Oil supply method of two-stage screw compressor, two-stage screw compressor applying the method, and method of operating refrigerating machine having the compressor A method of supplying lubrication oil to a two-stage screw compressor is disclosed in which a low-pressure stage screw compressor and a high-pressure stage screw compressor are integrally constructed. A compression space is formed by a male rotor and a female rotor,... | 05/25/2010 |
| 7722345 | Screw compressor In a screw compressor, a pair of rotors are located in a housing to be rotatable around their rotary axes to form in the housing a compression chamber in which gas sucked from a suction port of the housing is compressed thereby discharging the compressed gas from a ... | 05/25/2010 |
| 7618248 | Screw compressor with intermediate plate The invention relates to oil-flooded screw compressors having a male rotor and female rotor each featuring preferably a ratio of male-to-female rotor lobes of 4:6, 5:6 or 5:7. In order to decrease the bearing load at higher working pressures, the profile sections of... | 11/17/2009 |
| 7614862 | Water-injected screw compressor element Improved water-injected screw compressor element which mainly consists of a housing (2) on the one hand, confining a rotor chamber (5) with an inlet (6) on one far end and an outlet (7) on the other far end and in which two co-operating r... | 11/10/2009 |
| 7604467 | Supercharger with housing internal noise attenuation A positive displacement supercharger includes a housing defining a rotor cavity with a pair of positive displacement rotors operative to carry air axially from an inlet end to an outlet in the cavity wall near an outlet end of the cavity. The outlet communicates wit... | 10/20/2009 |
| 7588430 | Screw compressor A screw compressor according to the present invention includes a slide valve adapted to move forward and backward in parallel with the axis of a pair of screw rotors and also includes a plurality of hydraulic cylinders for moving the slide valve forward and backward... | 09/15/2009 |
| 7553144 | Gas compressor having a pair of housing heads In a gas compressor, housing heads are disposed to define an internal space with a housing, and two rotors housed in the internal space are rotatable to form in the internal space a compression chamber. The housing has an inner wall surface opposed to at least outer... | 06/30/2009 |
| 7473084 | Oil-cooled screw compressor In an oil-cooled screw compressor comprising, a compressor body including a pair of a male rotor and a female rotor, a motor including a stator and a motor rotor connected to one of the male and female rotors, and an oil separator container for gathering the oil fro... | 01/06/2009 |
| 7377956 | Method and system for processing natural gas using a rotary screw compressor Method and system for processing natural gas containing contaminants through the use of one or more rotary screw compressors. A natural gas containing a contaminant (e.g., water or carbon dioxide and/or hydrogen sulfide) and a contaminant removing agent are combined... | 05/27/2008 |
| 7364414 | Fluid pump system A fluid pump system has a cover, a fluid pump and a conduit. An inside of the cover is divided into a main chamber and a sub chamber. The fluid pump is accommodated in the main chamber. The conduit extends from the fluid pump to an outside of the cover through the s... | 04/29/2008 |
| 7338266 | Screw pump and method of operating the same A screw pump includes a pair of screw rotors (2a, 2b) having teeth which are held in mesh with each other for drawing and discharging a fluid by rotating the screw rotors (2a, 2b) synchronously in opposite dire... | 03/04/2008 |
| 7325273 | Suction device A suction device (2) for a hand-held power tool and which is releasably connected with the power tool, includes a suction blower wheel (20) for producing a suction air stream in a suction path (S) and located in the device housing (10), a rollin... | 02/05/2008 |
| 7318275 | Method of remanufacturing a compressor A compressor has a housing assembly and at least one rotor held by the housing assembly for rotation about a rotor axis. The rotor has a first face and a first housing element has a second face in facing spaced-apart relation to the first face of the rotor. One or m... | 01/15/2008 |
| 7316546 | Screw compressor (57) The compressor comprises a compressor element (2) with a compression chamber (7), to which an inlet conduit (3) is connected, with an inlet valve (4) comprising a valve element (16) which is connected to a piston (13... | 01/08/2008 |
| 7296983 | Gas compression apparatus capable of preventing lubricant leakage In a gas compression apparatus, a space (41a) between oil seals (18, 23) and bearings (15, 21) is adapted to communicate with a low pressure lead hole (42) open to the atmosphere through a blow-down lead hole (41). The low p... | 11/20/2007 |
| 7278839 | Multi-stage vacuum pump A multi-stage vacuum pump includes a plurality of casings connected in series and each casing defining a respective compression chamber, a plurality of partition plates each set in between each two casings. When compressed by rotors at shafts in one compression cham... | 10/09/2007 |
| 7275921 | Pumps A pump e.g. a screw pump, includes a main pumping element and a generally parallel auxiliary pumping element, and a pump housing, the main and auxiliary pumping elements interacting with each other and with an internal wall of an elongate pumping chamber of the hous... | 10/02/2007 |
| 7234925 | Screw pump A pump including a power rotor and an idler rotor, the rotors each being provided with a generally helical screw thread and being mounted for rotation in a housing such that the screw threads of the rotors mesh and rotation of one rotor causes rotation of the other ... | 06/26/2007 |
| 7234926 | Air compressor assembly A compressor assembly comprising first and second housing structures connected to one another. A compression chamber is formed integrally within the first and second housing structures. A separation chamber is formed integrally within the first and second housing st... | 06/26/2007 |
| 7232295 | Tempering method for a screw-type vacuum pump A screw-type vacuum pump (1) is tempered such that characteristics of the pump are not substantially altered when the pump is subjected to thermal stress. In order to achieve said aim, cooling is adjusted according to an operating state of the screw-type vacu... | 06/19/2007 |
| 7217038 | Fixing structure for rolling bearing In a fixing structure for a rolling bearing in which a bearing fixing ring is incorporated in a device and a rotating member is fixed to a bearing rotating ring using bolts, fastening areas with the bolts are set so that the natural frequency of the device as a whol... | 05/15/2007 |
| 7214036 | Screw type vacuum pump A screw vacuum pump which allows reduced power, lower inside gas temperature, and reduced discharging time. The pump has a pair of screw rotors rotatively engaged with each other in a pump casing to discharge a gas along a longitudinal direction of the pump. Each ro... | 05/08/2007 |
| 7214040 | Cylinder head arrangement for a piston compressor The invention relates to a cylinder head arrangement for a piston compressor, particularly for a hermetically enclosed refrigerant compressor, with a valve plate, a suction gas channel, a discharge chamber and a retainer element for a discharge valve. It is endeavou... | 05/08/2007 |
| 7201569 | Screw compressor Disclosed is a screw compactor comprising two screw rotors which are disposed in screw rotor bores inside a compressor housing and compress a coolant that enters at a coolant inlet and discharge said coolant at a coolant outlet, and a coolant inlet that is arranged ... | 04/10/2007 |
| 7192262 | Twin-shaft vacuum pump and method of forming same A twin-shaft vacuum pump includes two shafts and two rotors supported on respective shafts and cooperating with each other for producing a pumping effect, with each rotor being formed of a plurality of discoid components. ... | 03/20/2007 |
| 7189066 | Light gas vacuum pumping system A vacuum pumping system includes a primary vacuum pump having an inlet for coupling to a system, and a secondary vacuum pump having an inlet coupled to the exhaust of the primary vacuum pump. The primary vacuum pump is an oil-free, positive displacement vacuum pump ... | 03/13/2007 |
| 7186099 | Inclined scroll machine having a special oil sump A scroll-type compressor is provided in an inclined or inverted position with an oil sump disposed adjacent to a gas inlet of the scroll wraps to allow droplets of oil to be entrained in the gas being compressed so that the oil droplets in the gas can cool the scrol... | 03/06/2007 |
| 7178352 | Compressor A compressor has at least three-rotors. A first compression path between first inlet and outlet ports is associated with interaction of the first and second rotors. A second compression path between second inlet and outlet ports is associated with interaction of the... | 02/20/2007 |
| 7174917 | Inlet piece for a liquid-injected compressor element Inlet piece for a liquid-injected compressor element, characterized in that it comprises a sleeve (8) which consists of a casing (11), a bottom wall (12) provided with an opening (13) and a top wall (14) which is entirely tight, a ... | 02/13/2007 |
| 7165949 | Cavitation noise reduction system for a rotary screw vacuum pump A rotary screw vacuum pump system includes a vacuum bypass system, which communicates with a first closed cell formed by the rotor system. An air bypass valve within an air communication conduit is controlled by a solenoid valve that operates in response to a pressu... | 01/23/2007 |
| 7163387 | Meshing helical rotors A conjugate pair of intermeshing rotors include helical lobes having helical crests and intervening grooves and are adapted for rotation about parallel axes within a working space of a screw rotor machine. Each rotor has a tip circle, a pitch circle, and a root circ... | 01/16/2007 |
| 7153111 | Screw machine A screw machine (10) has a rotor housing (12) defining overlapping bores (12-1, 12-2). Female rotor (14) is located in bore (12-1) and male rotor (16) is located in bore (12-2). A wear resi... | 12/26/2006 |
| 7150611 | Equipment with mutually interacting spiral teeth There is designed an equipment with mutually interacting spiral teeth, comprising at least two spiral rotors seating in a stator, where surfaces of the rotor shafts, a rotation wrapper of each of the rotors, each one being furnished with at least one spiral tooth, a... | 12/19/2006 |
| 7144235 | Bearing and screw compressor A bearing comprising a resin layer, a backing strip and an intermediate layer which bonds the resin layer and the backing strip to each other is disclosed. The bearing undergoes a force from the resin layer side. A corrosion preventing layer is formed on each side f... | 12/05/2006 |
