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| Number | Title | Issue Date |
| 7399165 | Pump unit with multiple operation modes A first pump of small capacity and a second pump of large capacity are connected directly with each other and are driven by a variable-speed motor. The rotational speed of the variable-speed motor is controlled by a control device. In a first mode, a first discharge... | 07/15/2008 |
| 7223081 | Variable capacity rotary compressor A variable capacity rotary compressor to prevent eccentric bushes from rotating faster than a rotating shaft, and includes upper and lower compression chambers having different interior capacities thereof, and the rotating shaft with upper and lower eccentric cams b... | 05/29/2007 |
| 7150602 | Variable capacity rotary compressor A variable capacity rotary compressor including first and second compression chambers having different capacities, and a rotating shaft. First and second eccentric cams are mounted to the rotating shaft to be eccentric in a same direction. First and second eccentric... | 12/19/2006 |
| 7140844 | Variable capacity rotary compressor A variable capacity rotary compressor including upper and lower compression chambers having different interior capacities, and a rotating shaft. Upper and lower eccentric cams are provided on the rotating shaft to be eccentric from the rotating shaft in a same direc... | 11/28/2006 |
| 7134845 | Variable capacity rotary compressor A variable capacity rotary compressor including a housing to define therein two compression chambers having different capacities, a rotating shaft transmit ting a rotating force from a drive unit to the two compression chambers, two eccentric parts are provided on a... | 11/14/2006 |
| 7048517 | Pump as a pressure source for supercritical fluid chromatography The invention is a device and method in a high-pressure chromatography system, such as a supercritical fluid chromatography (SFC) system, that uses a pump as a pressure source for precision pumping of a compressible fluid. The preferred exemplary embodiment comprise... | 05/23/2006 |
| 6962486 | Variable capacity rotary compressor A variable capacity rotary compressor is designed to make a pressure of a high-pressure side be uniformly applied to upper and lower ends of a roller of a low-pressure side, allowing the roller of the low-pressure side to be smoothly rotated. The compressor includes... | 11/08/2005 |
| 6935853 | Variable capacity rotary compressor A variable capacity rotary compressor, which is designed to make an internal pressure of a compression chamber, where an idle rotation is executed, be equal to an outlet side pressure of the rotary compressor, thus minimizing a rotating resistance. The compressor in... | 08/30/2005 |
| 6874326 | Air conditioning system with two compressors and method for operating the same Disclosed are an air conditioning system with two compressors and a method for operating the same, so as to variably change a compression capacity of a refrigerant according to the variation of cooling load. Herein, when a full operation order is inputted to the two... | 04/05/2005 |
| 6796773 | Variable capacity rotary compressor A variable capacity rotary compressor, which precisely controls variation of a compression capability into a desired discharge pressure, and which minimizes a resistance to rotation of a rotating shaft, and thus improves the capacity of the rotary compressor. The ro... | 09/28/2004 |
| 6478550 | Multi-stage capacity-controlled scroll compressor A first bypass valve (27) that sets discharge capacity to 60% is provided in a first scroll 21 of an asymmetrical spiral-type scroll compressor. Also, a second bypass valve (40) that makes suction side and discharge side communicated with each other so th... | 11/12/2002 |
| 6453927 | Method and apparatus for precisely dispensing liquids A method and apparatus are provided for continuously dispensing precise quantities of a liquid from a dispenser holding tank into a receiving tank. A first elastic tube permits fluid flow between the holding tank and the receiving tank and a first perista... | 09/24/2002 |
| 6302654 | Compressor with control and protection system A compressor protection and control subsystem for a rotary compressor provides temperature pressure, mis-wiring and vibrational protection for the scroll machine. The vibrational protection comprises a vibration sensor which is integrated on the circuit b... | 10/16/2001 |
| 6206651 | Oil pump for an internal combustion engine having toothed wheels The invention relates to an oil pump for an internal combustion engine with at least one pair of toothed wheels which are in mutual engagement, at least one intake port and at least one outlet port. An improved supply of oil at reduced driving power can b... | 03/27/2001 |
| 6183207 | Digital pump A pump which can operate in a number of different modes, wherein each mode corresponds to a different output of the pump. The pump may have a plurality of pump chambers located within a pump housing. The pump chambers may be arranged in fluid communicatio... | 02/06/2001 |
| 5913663 | Device for regulating the total power of at least two variable displacement hydrostatic pumps A total power regulation device for a plurality of variable displacement pumps (1, 2), each having a regulation valve (18) which regulates its displacement volume, which is acted upon--against a counter-pressure--by a control pressure corresponding to the... | 06/22/1999 |
| 5775882 | Multicylinder rotary compressor A multicylinder rotary compressor capable of performing high performance capacity control operation without the need for an external piping or for a thicker partition plate which leads to a taller rotary compressing element or a longer bearing span of a b... | 07/07/1998 |
| 5775881 | Oil supply system The present invention relates to an oil supply system with at least one pressure and/or volume dependent controllable pump (1) and an oil tank (5) or the like from which the pump draws oil and delivers it with controlled output pressure or output volume t... | 07/07/1998 |
| 5600961 | Refrigeration system with dual cylinder compressor An energy-efficient refrigeration system includes a dual cylinder compressor and a compressor controller coupled to the compressor to control compressor capacity by selection of a predetermined refrigerant flow path through the compressor. The dual cylind... | 02/11/1997 |
| 5338160 | Individual controllable cylinder-plunger assemblies of a radial piston pump A radial piston pump includes a plurality of radially arranged cylinder-pger assemblies having suction valves and pressure-regulating valves, with the plungers being controlled by an eccentric disk which eccentrically circulates relative to a housing acc... | 08/16/1994 |
| 5326229 | Integral air suspension compressor and engine air pump An assembly is disclosed for supplying compressed air to both an engine and an air suspension of a motor vehicle. The assembly comprises a direct current electric motor, a centrifugal air pump, and a piston pump. The motor has a shaft extending outwardly ... | 07/05/1994 |
| 5228289 | Plural hydraulic pump system with unloading valve A pump system is disclosed which operates at high efficency in either a high volume, low pressure mode or a low volume, high pressure mode. First and second internal gear pumps are driven by a common drive shaft. The first pump has a smaller displacment t... | 07/20/1993 |
| 5211544 | Hydraulic pump A constructionally simplified hydraulic pump has two pump elements which discharge from a common suction chamber. The flows can be alternatively fed in common to a pressure outlet or separately to two outlets, one of which outlets leads back into the suct... | 05/18/1993 |
| 5199528 | Flow controller Apparatus for preventing damage to a machine in the event the machine inadvertently goes into reverse rotation. An automatically actuated flow controller is adapted to reroute the flow of lubricant to the primary pump when the machine rotates in a reverse... | 04/06/1993 |
| 5199854 | Hydraulic supply arrangement for use with active automotive suspension or the like The first of two serially arranged electromagnetically operated spool type drain control valves is conditioned to select the drain passage of smaller the pump before the second valve is moved from its closed or communication cut-off position, to its open ... | 04/06/1993 |
| 5186612 | Variable pressure inlet system for hydraulic pumps In the present fluid system, a variable pressure inlet system is provided and operational to control the operating pressure level of a charge pump in response to various operating parameters of the fluid system. The charge pump provides pressurized fluid ... | 02/16/1993 |
| 5165862 | Loading machine equipped with a first and a second pump supplying pressure oil to at least one hydraulically driven working component, such as a hydraulic piston-cylinder device or hydraulic motor A loading machine equipped with a first and a second pump for supplying hydraulic oil to at least one hydraulic operated working component, such as a hydraulic piston-cylinder device or a hydraulic motor having a varying oil-pressure and flow requirement,... | 11/24/1992 |
| 5110265 | Fuel pump A fuel pump having a first pumping mechanism for pumping a fuel in a main tank to a subtank and having a second pumping mechanism for pumping the fuel in the subtank to an outside of the main tank. The fuel pump includes a rotatable impeller having a plur... | 05/05/1992 |
| 5040951 | Oil pump An oil pump includes a pair of pump cartridges, one of which can be unloaded. Oil which is discharged from one of the pump cartridges is supplied to an accumulator through a supply passage in which an orifice is provided. The orifice is opened and closed ... | 08/20/1991 |
| 5013198 | Air-hydraulic pump with auxiliary pumping means An air-hydraulic pump incorporates a primary pumping mechanism for supplying a first level of fluid pressure to a work-performing tool at a first flow rate in response to a supply of pressurized air. An auxiliary pumping mechanism is provided for deliveri... | 05/07/1991 |
| 4992031 | Internal combustion engine driven multiple pump A power aggregate comprising a two-stroke engine, a piston rigidly linked together by means of a piston rod, a plurality of pump cylinders circumferentially mounted around the piston rod and a corresponding number of pump pistons fixed to the piston rod t... | 02/12/1991 |
| 4941807 | Hydraulic power generating pack An hydraulic power generating pack 1 comprises a primary pump 23 of the multi-cylinder, reciprocating ram type with a reciprocable piston 27 located in each cylinder 28 and displaceable by a crank shaft 20 rotatable by a prime mover 2 to provide a primary... | 07/17/1990 |
| 4938666 | Staged unloading of cylinder bank In a compressor having a plurality of banks of cylinders, smaller steps of unloading are achieved by unloading a single cylinder in a bank. When only one cylinder is to be unloaded, gas bypass is used in order to maintain a closer balance of forces in the... | 07/03/1990 |
| 4832579 | Plural hydraulic pump system with automatic displacement control and pressure relief valve A pump system is disclosed which operates at high efficency in either a high volume, low pressure mode or a low volume, high pressure mode. First and second internal gear pumps are driven by a common drive shaft. The first pump has a smaller displacement ... | 05/23/1989 |
| 4743168 | Variable capacity compressor and method of operating A plurality of unloading steps for a compressor are achieved by providing the compressor with at least two cylinders having different displacements. By unloading different cylinders, the compressor output is better able to match system demand.... | 05/10/1988 |
| 4543789 | Multiple displacement hydraulic pump system with automatic displacement control for brake boosters and the like A pump system is disclosed for delivering hydraulic fluid to a load device, such as a hydraulic brake system. The system automatically switches from larger displacement to smaller displacement as pressure at the outlet increases. The pump system comprises... | 10/01/1985 |
| 4381904 | Hydraulic power pack A hydraulic power pack for supplying hydraulic fluid under pressure for operating apparatus such as hydraulic workover units used in servicing oil and gas wells. The power pack provides substantially constant hydraulic power input to the driven apparatus ... | 05/03/1983 |
| 4245964 | Efficiency fluid pumping system including sequential unloading of a plurality of pumps by a single pressure responsive control valve In a fluid pumping system in which a fluid is pumped from a fluid supply to a load, two continuously driven fixed displacement pumps are operated in parallel to provide the pumping action. The two pumps are arranged with a common inlet, and with a common ... | 01/20/1981 |
| 4183723 | Rotary vane pump having multi-independent outputs due to stator surfaces of different contour A vane-type double lobe hydraulic pump having a casing with a rotor having a plurality of slots with each slot mounting a vane for tracking of a surrounding cam ring and porting for pumping from both undervane and intervane pumping chambers. The cam ring ... | 01/15/1980 |
| 4102606 | Multiple displacement pump system having control sequence for unloading valve A multiple displacement pump system utilizing a single fixed displacement pump having pumping elements providing both first and second sets of pumping chambers. Circuit means having a fluid utilization conduit provides for delivery of fluid to said fluid ... | 07/25/1978 |
