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8177535 Method for timing a polymer pump containing polymer  
A method for restoring the registry of opposed shafts that carry meshing pump teeth inside a polymer pump that contains polymer without removing polymer from within the pump, the method using an...
8152504 Method of operation of a spherical positive displacement rotary machine and devices for carrying out said method  
A positive displacement rotary machine with a body having an internal spherical working surface divided into bypass and propulsion areas, a rotor with a working rotational surface, a ring working...
8133045 Self-aligning pump rotor and methods  
A rotary fluid device having a housing that defines a pumping chamber, a shaft disposed in the housing, and a rotor disposed in the pumping chamber and engaged with the shaft. The rotor includes a...
8100676 Rotor, a method for producing such rotor and a pump comprising such rotor  
The invention relates to a rotor for a positive displacement rotary pump. The rotor comprises a hub with an aperture and a center axis through aperture and at least 2 lobes radially extending from...
7993120 Slide valve  
A compressor (20) has at least a first rotor (26; 28) at least partially within a bore (276; 278) of a housing. A slide valve element (102; 300) is positioned at least partially within a channel...
7993117 Scroll compressor and baffle for same  
A scroll compressor includes a baffle member in a high pressure region of the housing where compressed fluid is stored. The baffle serves to carry and transfer pressure loads away from the central...
7963753 Scroll compressor bodies with scroll tip seals and extended thrust region  
A scroll compressor includes scroll compressor bodies with axial tip seals projecting from the respective scroll ribs of fixed and movable scroll compressor bodies. An extended thrust region is...
7959422 Oil pump and method of assembling the oil pump  
An oil pump including a first housing having a rotation shaft insertion hole, a cam ring, a pump element, a rotation shaft rotatably extending through the rotation shaft insertion hole, a second...
7909591 Eccentric screw pump equipped with erosion-resistant rotor  
An eccentric screw pump or an eccentric screw motor has a rotor formed from at least a tubular jacket with at least two layers. The outer layer of the jacket consists of a material that is...
7905714 Progressing cavity pump assembly and method of operation  
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...
7878774 Moineau stator including a skeletal reinforcement  
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...
7878775 Scroll compressor with housing shell location  
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...
7874820 Compressor unloading valve  
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...
7857607 Rotary lobe pump  
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...
7845918 Powder metal scrolls  
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 met...
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...
7670121 Spherical fluid machines  
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...
7669577 Gerotor and method of assembling the same  
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...
7588426 Oil rotary vacuum pump and manufacturing method thereof  
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...
7540726 Scroll compressor and method for machining scroll wrap  
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...
7354258 Stator for an eccentric single-rotor screw pump and method for its production  
Stator for an eccentric single-rotor screw pump has a casing made of steel or the like and a helical elastomer lining. Stator and a method for its production are described which can also be made...
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...
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...
7214045 Spherical fluid machine with flow control mechanism  
A rotary fluid machine, such as a pump or motor, is provided with a fluid flow control mechanism that allows the flow of fluid to be easily and precisely controlled. The device has a housing with a...
7195468 Scroll compressor having frame fixing structure and frame fixing method thereof  
Disclosed are a scroll compressor having a frame fixing structure and a frame fixing method of the scroll compressor. The scroll compressor comprises an upper frame installed at an inner upper...
7165947 Screw compressor capable of manually adjusting both internal volume ratio and capacity and combined screw compressor unit accommodating variation in suction or discharge pressure  
A screw compressor is equipped with a manually operated internal volume ratio adjusting slide valve and capacity adjusting slide valve. The compressor is simple in construction, can be produced...
7156922 Multi-chamber installation for treating objects under vacuum, method for evacuating said installation and evacuation system therefor  
A multi-chamber installation (1) treats objects under vacuum. An evacuation system (5) is connected to a plurality of chambers (2, 3, 4). To reduce the complexity of the evacuation process, a...
7114931 Rotary pump  
A rotary pump includes a stator housing and a rotor. The stator housing preferably has an oblong inner surface. The rotor, which is disposed in the stator housing, preferably has a substantially...
7108493 Variable displacement pump having rotating cam ring  
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)...
7063523 Compressor discharge assembly  
A compressor assembly having a housing in which a compressor mechanism and discharge chamber are located. A first port communicates compressed gas and oil from the compressor mechanism to the...
6896499 Scroll compressor with flow restriction and back pressure chamber tap  
Scroll compressors include a tap for communicating a compressed refrigerant to a back pressure chamber to resist a separating force. A restriction is placed within this tap to slow build-up of the...
6887057 Minimal contact seal positive displacement device method and apparatus  
A positive displacement device that incorporates two rotors that are offset from collinear and each comprising a first and second set of vanes where the engagement surfaces of the first set of...
6887052 Scroll wrap tip with abradable selectively applied coating and load-bearing surface  
A scroll compressor is provided with a generally spiral wrap having an abradable or conformable coating on radially inner portions of its tip. The coating is not applied to radially outer portions....
6872061 Method for making a moineau stator and resulting stator  
The invention concerns a Moineau type gear pump stator (1), comprising a stator cavity with global axial extension inside an elongated body, characterised in that the stator cavity is defined by a...
6860730 Methods and apparatus for unloading a screw compressor  
A screw compressor is connected to a motor to be driven by the motor even during periods of low compressed air consumption. During such periods, the screw compressor is at least partially unloaded...
6827562 Method of controlling shifting of two-speed motor  
A method of controlling shifting of a multiple ratio fluid motor (10) between first and second speed ratios. The motor includes a shift valve (61) operable to achieve the second speed ratio by...
6824367 Multi-stage compression type rotary compressor and a setting method of displacement volume ratio for the same  
A multi-stage compression type rotary compressor 10 is provided with an electrical-power element 14, the first and second rotary compression elements 32, 34 driven by a rotary shaft 16 of the...
6821098 Screw compressor having compression pockets closed for unequal durations  
A compressor has male and female rotors with enmeshed screw-type body portions. A housing cooperates with the rotors to define inlet and outlet chambers for pumping of fluid from/to when the male...
6769886 Rotary vane pump with vane wear access port and method  
A rotary vane pump, including a housing within which is rotatably mounted a rotor having a plurality of slots therein with a vane positioned for sliding movement within each of the slots. An access...
6749404 Scroll compressors  
Scroll compressors (100, 110) may include a movable scroll (20) that is disposed opposite to a fixed scroll (2). At least one compression chamber (32) is defined between the fixed scroll and the...
6736622 Scroll compressor with offset scroll members  
A scroll compressor having a hybrid wrap is defined to have its wrap origin offset from a drive center of both the orbiting and non-orbiting scroll members. The offset is selected in a direction...
6719546 Arrangement for controlling the flow of a coolant fluid in a compressor  
The invention comprises an arrangement for controlling the flow of a coolant fluid in a compressor, in particular in a rotary compressor, in which a coolant-fluid inlet for coolant fluid discharged...
6695602 Bacterial growth inhibition in a circulation system comprising a compressor  
The present invention relates to a compressor (1) that has an associated coolant circulation system (1, 4, 6, 8, 11, 13), and also to a method of maintaining a low bacteria content in the coolant...
6679691 Anti cavitation system for two-speed motors  
A two-speed gerotor motor (10) including motor valve means (19,43) to communicate fluid to and from expanding (33E) and contracting (33c) fluid volume chambers. The motor includes a shift valve...
6666666 Multi-chamber positive displacement fluid device  
A pump comprises multiple, axially stacked positive displacement fluid device sections, such as circumferential piston pumps having chambers and contra-rotating chambers. The device can be...
6648617 Method and scroll compressor for compressing a compressible medium  
The invention relates to a method for compressing a compressible medium, in which at least two displacement elements, each having at least one limiting face extending helically in the cross...
6634873 Method for determining engagement surface contours for a rotor of an engine  
An improved rotary engine and method for determining the contours of the sealing surfaces thereof. The improved engine provides for maintaining a predetermined, optimal gap between the sealing...
6623262 Method of reducing system pressure pulsation for positive displacement pumps  
An improved method and apparatus for reducing pressure pulsation when pumping fluids having highly entrained gas therein. The pump has a drive screw and a pair of idler screws. The screws are...
6612820 Screw compressor having sealed low and high pressure bearing chambers  
A method and apparatus for compressing process fluids in a working chamber having a male and a female rotor, each supported by shafts in a first and a second bearing chamber maintained at low and...
6604923 End seal features for scroll compressors  
A scroll compressor includes a stationary scroll and a moveable scroll. The stationary scroll has a top surface, a bottom surface, and side edges extending between the top surface and the bottom...
Matches 1 - 50 out of 230 1 2 3 4 5 >