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| Number | Title | Issue Date |
| 8021134 | Compressor slide valve support A compressor (20) has an unloading slide valve (100). The valve 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. A first surface (2... | 09/20/2011 |
| 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 (200; 301) in the housing and has a ... | 08/09/2011 |
| 7887310 | Compressor unloading valve A compressor (20) has an unloading slide valve (100). The valve 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. A piston (124)... | 02/15/2011 |
| 7878782 | Screw compressor The present invention relates to a screw compressor and a method for operating the compressor primarily for gaseous refrigerants, comprising a compressor housing (4) and a male (8) and a female (10) screw rotor arranged in screw rotor bores in t... | 02/01/2011 |
| 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 compression path between suction ( | 01/25/2011 |
| 7798793 | Compressor slide valve lubrication A compressor (20) has an unloading slide valve (100). The valve 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. A first surface (2... | 09/21/2010 |
| 7568898 | Compressor sound suppression A compressor apparatus has a housing (22) having first (53) and second (58) ports along a flowpath. One or more working elements (26, 28) cooperate with the housing to define a compression path between suction and discharge locations alon... | 08/04/2009 |
| 7547203 | Screw compressor In order to improve a screw compressor for compressing refrigerant in a refrigerant circuit, comprising a compressor housing, in which a screw rotor receiving means and an inlet channel as well as an outlet channel for the refrigerant to be compressed are provided, ... | 06/16/2009 |
| 7481634 | Volumetric screw compressor provided with delivery adjustment device A volumetric compressor comprising: a casing provided with a suction chamber and a delivery chamber, between which a pair of screw rotors is included; a pan containing oil, and a delivery adjustment unit equipped with a slide valve, cooperating with the rotors and w... | 01/27/2009 |
| 7374406 | System and method for reducing noise in multi-capacity compressors A method and system is provided for reducing chatter in multi-capacity compressors having disengageable eccentric structures. The multi-capacity fluid compressor includes a compression chamber having a discharge end and an inner surface. The compressor also includes... | 05/20/2008 |
| 7367122 | Stepped sleeve repair of knife seal bores in driven compressor housing A method is provided for repairing a driven compressor housing including a bore having an inner surface configured to engage a shaft-mounted knife seal. The method includes the steps of removing material from the bore inner surface, press-fitting a sleeve into the b... | 05/06/2008 |
| 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 |
| 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 |
| 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 |
| 7163194 | Actuator for rotor valve An actuator (16) for a rotor valve (10). The actuator includes a rack (86) for driving a pinion gear (87) of the valve. The rack is moved between first and second positions by the action of a first piston (88). Movement of the firs... | 01/16/2007 |
| 7104772 | Screw compressor In a screw compressor for a refrigerator, suction-side rotor shafts of screw rotors are supported rotatably by angular ball bearings for forward thrust load, an annular gap is formed between the angular ball bearings and a suction-side bearing casing, and outermost ... | 09/12/2006 |
| 6964560 | Vacuum pump An object of this invention is to prevent drop of life of a bearing by an axial force when using a pump as a compressor. In a vacuum pump 1 compressing and discharging gas in a direction of a rotor axis by rotation of screw rotors 3, 4 engaged together... | 11/15/2005 |
| 6926821 | Water treatment device with volumetric and time monitoring features A totalization meter system for a water treatment device, the device having an inlet aperture and an outlet aperture, and a channel for channeling water between the inlet and outlet apertures. A flow reactive device is positioned in the channel and is exposed to the... | 08/09/2005 |
| 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 |
| 6902380 | Vacuum pump with pump rotor pairs and permanent magnet motor A vacuum pump has a casing having an inlet port and an outlet port, and a pair of confronting pump rotors which are provided inside the casing and synchronously rotatable for drawing in a gas from the inlet port and discharging the gas from the outlet port. A motor ... | 06/07/2005 |
| 6874486 | Supercharger with multiple backflow ports for noise control A supercharger includes multiple back flow ports which are controlled by valves. The valves regulate the timing and area for back flow of pressurized outlet air into the rotor chambers. The back flow air tends to equalize air pressure in the chambers prior to their ... | 04/05/2005 |
| 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 to make it easier and less costly to drive the compressor. The unload... | 03/01/2005 |
| 6823686 | Pressure equalization system and method A pressure equalization method and system is provided for starting a compressor while maintaining the condenser at a high pressure and includes a valve and a bleed port. The compressor has a compressor inlet for receiving a fluid at a first pressure and a compressor... | 11/30/2004 |
| 6811384 | Automatic regulator of intake air in a tank An automatic regulator of the air intake in a tank installed in a circuit for the production of compressed air wherein the regulator provides that the intake orifice (7) which aspires external air is operated in opening/closing by means of a disk shutter. The... | 11/02/2004 |
| 6739853 | Compact control mechanism for axial motion control valves in helical screw compressors An axial slide valve is provided with an axially extending fluid chamber at each end with one chamber receiving a spring and being acted on by suction pressure and the other chamber coacting with a fixed piston and being acted upon by discharge pressure or the like ... | 05/25/2004 |
| 6679689 | Screw compressor A package-type screw compressor includes a low-pressure stage state compressor and a high-pressure stage compressor. Motive power is transmitted from an electric motor to the two compressors via a speed increaser. The discharge gas, compressed and heated ... | 01/20/2004 |
| 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 |
| 6638042 | Asymmetric porting for multi-rotor screw compressor A screw compressor includes a compressor housing defining parallel rotor housing sections, each rotor housing section containing a rotor, and adjacent rotors defining compressor pairs, the housing further including a suction port and a discharge port for ... | 10/28/2003 |
| 6599112 | 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 fema... | 07/29/2003 |
| 6584791 | Pressure equalization system and method A pressure equalization method and system is provided for starting a compressor while maintaining the compressor at a high pressure and comprises a valve and a bleed port. The compressor has a compressor inlet for receiving a fluid at a first pressure and... | 07/01/2003 |
| 6572350 | Screw compressor A package-type screw compressor includes a low-pressure stage state compressor and a high-pressure stage compressor. Motive power is transmitted from an electric motor to the two compressors via a speed increaser. The discharge gas, compressed and heated ... | 06/03/2003 |
| 6520758 | Screw compressor assembly and method including a rotor having a thrust piston An air compressor assembly of the rotary screw type. The air compressor assembly comprises a housing having an inlet end and a discharge end. An internal working chamber extends within the housing and terminates in a discharge end face at the discharge en... | 02/18/2003 |
| 6494699 | Axial unloading lift valve for a compressor and method of making the same A screw compressor having an unloader valve with a movable valve member, the unloader valve being capable of indicating when the valve member is installed incorrectly. The valve member is manufactured such that if it is installed incorrectly it provides a... | 12/17/2002 |
| 6461119 | Lift valve for a rotary screw compressor The present invention relates to a variable capacity helical screw compressor for compressing a gaseous medium, usually air. The compressor includes at least one lift valve (1) which connects with a first compression chamber in the compressor. The lift va... | 10/08/2002 |
| 6422846 | Low pressure unloader mechanism Two slide valves are located in the discharge end bearing case of a multi-rotor screw machine and independently coact with the sun rotor of the multi-rotor screw machine for controlling capacity and Vi. Movement of the slide valves is in a plan... | 07/23/2002 |
| 6409490 | Rotary screw compressor with slide valve and slide stop guidance bushings In a screw compressor, guide bushings are mounted within bores for the bearings which support rotor shafts for the compressor. First bushings are provided at an inlet casing of the compressor and provide guidance for a slide stop and second bushings are p... | 06/25/2002 |
| 6375443 | Screw rotor type wet vacuum pump A feed pipe 26 for a sealing water is connected to a housing of the pump to communicate with an enclosed chamber which is defined between a position in which a helical seal line of screw rotors 17 isolates the enclosed chamber from a suction port 15 of th... | 04/23/2002 |
| 6371742 | Cooling device The invention concerns a cooling device wherein the chamber (2) represents cooling channels arranged in the thickness of the pump cylinder walls. The steam flux (7) generated by the heat to be evacuated reaches the upper end of the condenser (1) and comes... | 04/16/2002 |
| 6364645 | Screw compressor having a compressor screw housing and a spaced outer housing In order to improve a screw compressor for compressing a working medium, comprising an outer housing, two screw rotors which are arranged in the outer housing in rotor bores provided for them and a drive for the screw rotors, in such a manner that the sea... | 04/02/2002 |
| 6338616 | Screw rotor compressor having a movable wall portion A screw rotor compressor is provided that includes two mutually coacting helical screw rotors and a rotor housing (1). The housing (1) includes a first end wall (2) and a second end wall (3) and a barrel wall (7, 11) that interconnects the end walls. The ... | 01/15/2002 |
