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| Number | Title | Issue Date |
| 7798794 | Screw pump and screw rotor A cross section of a tooth profile of a first screw rotor (17) perpendicular to the rotor axis includes a tooth top arc (A1B1), a tooth bottom arc (C1D1), a first curve (A1C1), and a second curve (B1D1).... | 09/21/2010 |
| 7753665 | Screw compressor for working pressures above 80 bar On screw compressors for extremely high discharge pressures, e.g. for application in refrigeration systems operating with CO2 in a transcritical process, featuring two rotors, a male rotor and a female rotor having a ratio of male-to-female rotor lobes of... | 07/13/2010 |
| 7637726 | Screw vacuum pump A screw vacuum pump includes a gas working chamber formed by a male screw rotor and a female screw rotor respectively including unequal lead screws engaging each other and having a lead angle that continuously changes with the advance of helix and a stator receiving... | 12/29/2009 |
| 7513761 | Double screw compressor for supplying gas A double-screw compressor for supplying gas, such as air, to a gas consumer, is provided. The double-screw compressor includes two interacting rotors for compressing the gas and a toothed gearing. The toothed gearing includes a gearing housing with two opposite end ... | 04/07/2009 |
| 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 |
| 7255545 | Double-lobe type rotor design process A double-lobe type rotor design process includes a process for forming a defined rotor and a process for forming a conjugate rotor, wherein the defined rotor and the conjugate rotor intermesh and conjugate to each other. The rotor profile curves suitably for the com... | 08/14/2007 |
| 7232298 | Screw compressor in which the trailing flanks of the lobes of at least one rotor body are beveled at an end surface of the rotor body near the outlet port A helical screw rotor compressor is provided which includes a rotor housing that includes a barrel wall between two parallel end walls, an inlet port at a first end and an outlet port at a second end. The compressor has an internal shape corresponding to two paralle... | 06/19/2007 |
| 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 |
| 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 |
| 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 |
| 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 |
| 7111606 | Rotary positive displacement device A device to convert energy having exterior and interior rotors where the number of legs (Λ) of an interior rotor divided by the number of chambers (X) defined by the fins of the outer rotor is equal to the effective radius of the inner reference circle ri | 09/26/2006 |
| 7044724 | Screw compressor and method of manufacturing rotors thereof A screw compressor comprises a casing, and a male and a female rotor formed with axially twisted screw grooves and accommodated in the casing, the both rotors being rotated by timing gears fixed to the respective rotors while a desired minute gap is kept therebetwee... | 05/16/2006 |
| 7040845 | Screw compressor and method of manufacturing rotors thereof A screw compressor comprises a casing, and a male and a female rotor formed with axially twisted screw grooves and accommodated in the casing, the both rotors being rotated by timing gears fixed to the respective rotors while a desired minute gap is kept therebetwee... | 05/09/2006 |
| 7040870 | Gear pump with gears having curved teeth and method of feeding elastomeric material A gear pump and method for pumping elastomeric material having two gears with meshing herringbone gear teeth. Each of the gear teeth has helical side portions and a curved central portion which extends circumferentially of the gear a distance equal to at least one h... | 05/09/2006 |
| 7008201 | Gapless screw rotor device A screw rotor device has a housing with an inlet port and an outlet port, a male rotor with helical threads, and a female rotor with helical grooves. The helical threads and helical grooves are designed to eliminate the blow hole leak pathway for multiple-pitch scre... | 03/07/2006 |
| 6948915 | Oil free screw compressor A screw compressor includes a compressor main body, a male rotor having a screw-like male tooth shape and a female rotor having a screw-like female tooth shape meshing with the screw-like male tooth shape or the male rotor. The male and female motors are provided wi... | 09/27/2005 |
| 6913452 | Offset thread screw rotor device A screw rotor device has a housing with an inlet port and an outlet port, a male rotor, and a female rotor. The male rotor has a pair of helical threads with a phase-offset aspect, and the female rotor has a corresponding pair of helical grooves. The female rotor co... | 07/05/2005 |
| 6779993 | Rotor profile for screw compressors A rotor profile for screw compressors is disclosed. The rotor profile is shown in a latitudinal cross-section taken along a line extending in a direction perpendicular to rotor axes, and is applied to male and female rotors used in a screw compressor having a housin... | 08/24/2004 |
| 6769891 | Rotary positive-displacement pump with meshing gear wheels without encapsulation, and gear wheel for such a positive-displacement pump A rotary positive-displacement pump comprises two gear wheels which mesh with each other without encapsulation. Each gear wheel has a plurality of teeth with a profile which falls within a band of tolerance of ±{fraction (1/20)}th of the depth of the tooth with res... | 08/03/2004 |
| 6769890 | Gas rotary screw compressor A gas rotary screw compressor (1), in particular, for cooling gas suitable for low-power systems, the compressor having a casing (1a) having an intake conduit (6) and a delivery conduit (7); and the casing (1a) having... | 08/03/2004 |
| 6719548 | Twin screw rotor device A screw rotor device has a housing with an inlet port and an outlet port and at least one pair of rotors. The rotors each have an identical number of threads (N), a buttress thread profile with a diagonal line, and a length that is either approximately equal to or l... | 04/13/2004 |
| 6719547 | Offset thread screw rotor device A screw rotor device has a housing with an inlet port and an outlet port, a male rotor, and a female rotor. The male rotor has a pair of helical threads with a phase-offset aspect, and the female rotor has a corresponding pair of helical grooves. The female rotor co... | 04/13/2004 |
| 6702558 | Twin screw rotors and displacement machines containing the same The twin screw rotors for axis-parallel installation in displacement machines for compressible media have asymmetrical transverse profiles and numbers of wraps that are ࣙ2. Depending upon the wrapping angle (), the pitch (L) varies, which pitch i... | 03/09/2004 |
| 6701220 | Industrial robot device An industrial robot including a manipulator having a control system. The manipulator includes a common gear housing having first and second inner compartments connected with a passage channel. First and second gears are arranged in the first and second in... | 03/02/2004 |
| 6692243 | Screw compression flow guide for discharge loss reduction A screw compressor includes a housing having a discharge port; and at least two rotors disposed in the housing for generating opposed discharge flows through the discharge port, wherein the discharge port has edges defining a discharge opening, and wherei... | 02/17/2004 |
| 6652250 | Screw compressor having intermediate shaft bearing A screw compressor 1 comprises a screw compressor body 2 having a pair of female and male screw rotors 21 meshed with each other encased in a rotor casing 22, and a motor casing 4 having a motor 3 for driving a male rotor 21b of the screw rotor 21 encased... | 11/25/2003 |
| 6632145 | Fluid displacement pump with backpressure stop The fluid displacement pump enables substantially continuous pumping from a low-pressure side to a high-pressure side substantially without any backflow or backpressure pulsations. Liquid or gas is injected to the high-pressure side by way of mutually int... | 10/14/2003 |
| 6588207 | Step-less, hydraulic power transmission The step-less hydraulic power transmission of the present invention comprises essentially two gear pumps including a first pump that is reversible and continuously variable, in which the per revolution output is directly proportional to engine RPM. The fi... | 07/08/2003 |
| 6554593 | Dry screw vaccum pump having nitrogen injection A dry vacuum pump assembly that includes a casting having an inner chamber, an inlet and an outlet communicating with the inner chamber, a pair of right and left handed screw rotors positioned in the casing, each screw rotor having a cross section formed ... | 04/29/2003 |
| 6447276 | Twin screw rotors for installation in displacement machines for compressible media Displacement machines for compressible media having single-threaded, twin screw rotors with continuously decreasing pitch to achieve an inner compression are known. The demand for compact pumps with rotors as short as possible, and the frequent, process-r... | 09/10/2002 |
| 6422847 | Screw rotor tip with a reverse curve A rotor for a screw rotor machine includes a shaft and a plurality of lobes disposed on the shaft, each of the lobes extending radially outward from the shaft and having a tip surface, a rear surface and a transition section disposed between the tip surfa... | 07/23/2002 |
| 6386848 | Screw rotors and screw machine In screw rotors (21, 22) which are each provided with a screw tooth (211, 221) having a spiral addendum surface portion (211a, 221a) and a deddendum surface portion (211c, 221c), and are used as a pair of male and female, between the addendum surface port... | 05/14/2002 |
| 6371744 | Dry screw vacuum pump having spheroidal graphite cast iron rotors A dry vacuum pump that includes a casting having an inner cylinder communicating with an inlet and an outlet of the pump, shafts supported by the casting, spiral toothed parts formed on the shaft a plurality of screw rotors each of which includes the shaf... | 04/16/2002 |
| 6368091 | Screw rotor for vacuum pumps The moment Mo of unbalanced forces Fr of a screw rotor A1 is reduced by adjusting the number of thread leads of a threaded portion 2 of the screw rotor A1 to (an integer +0.5). The amount of unbalance for keeping a state of dynamic balance thereby decreas... | 04/09/2002 |
| 6361289 | Medical gear pump for suctioning and rinsing A medical gear pump is used for suction and irrigation, in particular for endoscopy or the laboratory, and it has two meshing gears as conveying elements, one of which is joined to a drive mechanism. The gears are received in non-journal-mounted fashion i... | 03/26/2002 |
| 6328546 | Screw compressor with adjustable full-load capacity A screw-compressor of which the full-load capacity can be adjusted without changing the shape, number of components and basic dimensions of the compressor, wherein the outer circumferential area of teeth above the pitch circle of the intake side end of th... | 12/11/2001 |
| 6296461 | Plural screw positive displacement machines Helical intermeshing main and gate rotors (1, 2) are mounted for rotation about their axes in respective intersecting bores in a housing. The profiles of the rotors as seen in cross section are generated by the same rack formation. The high pressure flank... | 10/02/2001 |
| 6257855 | Screw fluid machine A screw rotor for use in screw compressors and screw vacuum pumps comprises a pair of rotors including a male rotor and a female rotor. These rotors have helical lobes in an axial direction and mesh with each other to form a compression chamber. Depending... | 07/10/2001 |
| 6244844 | Fluid displacement apparatus with improved helical rotor structure A fluid displacement apparatus includes a housing defining a chamber therein having a first port and a second port. First and second helical rotors with opposing pitches are meshed within the chamber, in fluid communication with the first and second ports... | 06/12/2001 |
