Class / Patent application number | Description | Number of patent applications / Date published |
417307000 | Pressure responsive relief or bypass valve | 57 |
20080199329 | Device for reducing pulsation in a variable displacement compressor - The present invention is directed to provide a device for reducing pulsation in a variable displacement compressor. The compressor is connected to an external refrigerant circuit. The device for reducing pulsation includes a flow passage and a control valve. The control valve includes a valve housing, a spool valve and a damper chamber. The spool valve has formed therethrough a flow hole. The damper chamber communicates with the flow passage adjacent to the external refrigerant circuit through the flow hole. Effective cross-sectional area and effective length of the flow hole are determined based on frequency of a specific pulsation of the refrigerant gas and volume of the damper chamber at the time of the development of the specific pulsation in such a manner that the specific pulsation is developed, resonance effect of a Helmholtz resonator takes place in the damper chamber. | 08-21-2008 |
20080206074 | Compressor, Especially Axial Piston Compressor for a Vehicle Air Conditioning System - Compressor, especially an axial piston compressor for a vehicle air-conditioning system, having a housing delimiting a drive mechanism chamber ( | 08-28-2008 |
20080240939 | Compressor Having a High Pressure Slide Valve Assembly - A compressor having a high pressure slide valve assembly is disclosed. The slide valve assembly includes: a volume slide valve mechanism, the mechanism slidably movable to control compressor volume ratio and power input to the compressor. The assembly also includes a capacity slide valve mechanism that is in operational association with the volume slide valve mechanism, the capacity slide valve mechanism slidably movable to control compressor capacity. At least one of the volume slide valve mechanism and the capacity slide valve mechanism includes at least one groove or channel, and the at least one groove or channel provides for lubrication to ensure relative movement between the slide mechanisms in a high pressure environment. A method of controlling compressor volume ratio, power input and capacity in a compressor operating in a high pressure environment is also disclosed. | 10-02-2008 |
20080240940 | COMPRESSOR IMPROVEMENTS - A linear compressor has a hollow piston with crown and sidewall. The piston reciprocates in a cylinder. A piston rod connects the piston to a spring. A connection between the piston rod and the piston transmits axial forces directly to the piston crown. The connection transmits lateral forces to the piston at an axial location away from the piston crown. The connection allows rotational flexibility between the piston and the piston rod transverse to and uniformly around the piston reciprocation axis. | 10-02-2008 |
20080317609 | Controllable Coolant Pump - The invention relates to a controllable coolant pump for internal combustion engines which is driven by torque transmission elements. It is an object of the invention to develop a driven, controllable coolant pump of this type for internal combustion engines, which ensures further functioning of the coolant pump (failsafe) if the control means fails, is distinguished by a high degree of efficiency and a very compact, simple, robust design, and, even in the case of operating medium which is loaded with dirt, ensures high operational safety and reliability and makes active control of the coolant delivery amount possible, in order firstly to ensure optimum warming up of the engine by “zero leakage” and in order secondly, after warming up of the engine, to influence the engine temperature during continuous operation so exactly that both the emission of pollutants and the friction losses and fuel consumption can be reduced considerably over the entire operating range of the engine. According to the invention, this object is achieved by a controllable coolant pump having a pump housing ( | 12-25-2008 |
20090041593 | VARIABLE DISPLACEMENT TYPE GEAR PUMP - A variable displacement type gear pump has gear chambers, one of which is a specific gear chamber. A suction passage is formed in the housing so as to communicate with suction-side spaces. An outlet passage communicates with discharge-side spaces. A return passage returns the fluid discharged to the discharge-side space of the specific gear chamber to the suction passage. The return passage communicates with the suction passage at a confluence portion located upstream side of the suction-side space. An opening and closing valve opens the return passage in a small displacement operational state. A check valve is located between the discharge-side space of the specific gear chamber and the outlet passage for preventing the fluid discharged from the gear chamber other than the specific gear chamber from flowing into the discharge-side space of the specific gear chamber in the small displacement operational state. | 02-12-2009 |
20090116975 | Screw Compressor Comprising a Relief Valve - A compressor arrangement includes a compressor housing, an intake region defined in the compressor housing, a control pressure connection in communication with the intake region, a control pressure chamber in communication with the control pressure connection, a control piston disposed in the compressor housing beneath the control pressure chamber, a guide element securing the control piston in the compressor housing, at least one sealing element disposed between the control piston and the guide element, and a feed pressure connection defined in the compressor housing to supply compressed air beneath the control piston. In a closed position, the control piston closes the feed pressure connection when in the closed position. In an opened position, the control piston opens the feed pressure connection when in the opened position, thereby permitting air to vent from the feed pressure connection via a venting connection. | 05-07-2009 |
20090202365 | Method for controlling pump of working machine - The present invention is intended to provide a technology that can utilize the advantages of both a load sensing control and a regeneration circuit without causing any problem. | 08-13-2009 |
20090238699 | CONTROL VALVE ASSEMBLY FOR A COMPRESSOR UNLOADER - A closing element is for a valve assembly of a compressor unloader, the compressor including a casing with a compression chamber, the unloader including a housing defining a chamber. The valve assembly has a base between the compression and unloader chambers, a passage connecting the two chambers, a seat about the passage, and a stem bore within the base having a control chamber. The closing element includes a main body movably disposed within the stem bore and having a sealing surface disposeable against the valve seating surface to obstruct the valve passage and a control end surface within the bore control chamber A sealing member disposed about the main body prevents flow between the control chamber and the valve passage. The main body and/or the sealing member is configured such that the main body is radially moveable to align the body sealing surface with the valve seat. | 09-24-2009 |
20090238700 | EQUIPMENT FOR CONTINUOUS REGULATION OF THE FLOW RATE OF RECIPROCATING COMPRESSORS - Equipment for continuous regulation of the flow rate for a reciprocating compressor, provided with at least one compression chamber ( | 09-24-2009 |
20090246041 | DISPLACEMENT CONTROL VALVE OF A VARIABLE DISPLACEMENT COMPRESSOR - [Object of the Invention] An object of the present invention is to provide a displacement control valve of a variable displacement compressor for opening and closing a communication passage extending between a portion of the compressor on which discharge pressure acts and a crank chamber of the compressor, thereby controlling the displacement of the compressor, wherein discharge chamber pressure does not act on the valve body in the opening and closing direction, pressures acting on the opposite ends of the valve body are reliably maintained at the same level, and the structure thereof is simple. | 10-01-2009 |
20090252621 | HIGH PRESSURE FUEL PUMP - A high pressure fuel pump encompasses at least one delivery chamber and one high pressure outlet. In addition, a pressure limiting valve with a valve that is actuated by a pressure differential is provided that can open from the high pressure outlet to the delivery chamber. On a high pressure side of a valve seat of the pressure limiting valve, it is advantageous that a throttle device is provided, whose free cross section is at most approximately equal to a desired maximum opening cross section of the pressure limiting valve. | 10-08-2009 |
20090274566 | CHECK VALVE WITH PLASTIC LIP SEAL - A check valve is provided having a seat and a poppet. The seat is made of a plastic material, has an aperture for enabling fluid to flow through the seat, and also has one end portion that has a circumferential edge with a thin sealing lip. The poppet is slidably arranged in the aperture of the seat and has an elastic member. The poppet is configured for opening to enable fluid to flow in one direction when fluid pressure is detected. The elastic member is configured for ensuring sealing between an outer surface of the poppet and the thin sealing lip of the seat when there is no fluid flow in the one direction so as to substantially prevent fluid flow in the opposite direction. According to some embodiments of the present invention, the thin plastic sealing lip may have a thickness of about 0.01″ Embodiments are also envisioned where the thickness may be in a range of 0.003″-0.03″. | 11-05-2009 |
20100028171 | Control System and Method For Pump Output Pressure Control - A pump system includes pump having a control feature which, responsive to a supply of pressurized working fluid, reduces the pressure of the working fluid pressurized by the pump. The control feature is connected to the output of the pump by a regulating valve. The control feature receives pressurized working fluid to decrease the output of the pump in response to the pressure of the supplied working fluid. A regulating valve selectively connects the pressurized working fluid to the control feature. The regulating valve has a control port to receive pressurized working fluid from the pump to urge the valve to a closed position against a biasing force. A controllable valve is operable to interrupt the supply of pressurized working fluid to control port to alter the output pressure of the pump. | 02-04-2010 |
20100047086 | Fuel pump - A housing has a compression chamber and a first passage, through which the compression chamber communicates with an accumulation chamber. A discharge valve is provided in the first passage and configured to open to supply fuel from the compression chamber to the accumulation chamber in response to increase in pressure in the compression chamber. A second passage is configured to communicate the accumulation chamber with the compression chamber via the discharge valve. A valve element allows fuel flow from the accumulation chamber to the compression chamber. A biasing unit biases the valve element to seat the valve element on a valve seat of the second passage. The sidewall of the valve element and the inner wall defining the second passage therebetween define a throttle midway through the second passage for restricting fuel flow from the accumulation chamber to the compression chamber. | 02-25-2010 |
20100086417 | Motor pump unit, in paticular for vehicle power steering - A motor/pump unit includes a housing and at least one of: an external tank; an ECU axially disposed at the housing of the motor/pump unit; an ECU radially disposed at the housing of the motor/pump unit; electrical connector plugs of the ECU that are radially disposed; electrical connector plugs to the ECU that are axially disposed; a lead frame of the ECU that is configured in the shape of a dish; a lead frame of the ECU that is externally attached to the housing of the motor/pump unit; and a pressure limitation and check valve that is attached laterally of the pump of the motor/pump unit. The motor/pump unit is also one of firmly attached to the steering gear and integrated in the steering gear. | 04-08-2010 |
20100158709 | Plug Unloader Using Low Force Actuator For Reciprocating Compressors - The advantages of plug type unloaders are well know and accepted by authorities such as American Petroleum Association as well as compressor and component manufacturers as well as users. There are further benefits to this device such as eliminating plug to valve misalignment and is lighter than other type unloaders. Field replacement of valve depressor unloaders is economically feasible and any type compressor valve that may be used. | 06-24-2010 |
20100183452 | ADAPTOR FOR AN AIR COMPRESSOR AND AN AIR COMPRESSOR - The invention discloses an adaptor ( | 07-22-2010 |
20100284832 | REGULATABLE COOLANT PUMP - The invention relates to a controllable coolant pump driven by a belt pulley for internal combustion engines. The aim of the invention is to develop a controllable coolant pump (having a gate valve) driven by a belt pulley, allowing significant reduction in both pollutant emissions and frictional losses and fuel consumption over the entire working range of the engine, and allowing reliable actuation of the gate valve with very low drive power, even under unfavorable thermal boundary conditions, such as in proximity of the turbocharger, as well as under very limited installation space, and ensuring continued functioning of the coolant pump (fail-safe) even if the controller fails, and characterized by a very simple, low-cost production and assembly design “standardized” for different pump sizes, thereby ensuring continuously high operational reliability at a high volumetric efficiency, and requiring no air-free charging in the factory, and that can be simply and inexpensively integrated in the engine management system. The controllable coolant pump according to the invention, having a gate valve and driven by a belt pulley ( | 11-11-2010 |
20100310387 | ADJUSTABLE UNLOADER VALVE - A pressure unloader valve is disclosed having inlet and outlet connections adjustable about two dimensions to adapt to a wide variety of high pressure pumps and similar equipment associated with such applications. According to one embodiment, the inlet and outlet connections are adjustable about both a horizontal and a vertical axis. A method for regulating pressure in a valve and pump assembly is also disclosed. | 12-09-2010 |
20110223041 | Pump - A pump has a housing in which a rotor is arranged, which is rotatable in the housing about a housing-fixed axis of rotation, the rotor having at least one recess in which is received at least one displacement body which, when the rotor rotates, revolves about the axis of rotation and at the same time runs along on a housing inner wall of the housing, the displacement body being radially movable in the recess between a position retracted into the recess and a position extended out of the recess. A first chamber is present between the outside of the rotor and the housing inner wall. The displacement body, when it revolves about the axis of rotation, subdivides the first chamber into a leading first subchamber and a trailing second subchamber. The first subchamber is connected by means of a first duct and the second subchamber by means of a second duct in the rotor to a further chamber which is formed between the displacement body and an inner wall of the recess and which, according to the radial movements of the displacement body which occur when the rotor revolves about the axis of rotation, is alternately increased in volume, with the result that an additional vacuum arises in the further chamber and in the second subchamber, or decreased in volume, with the result that an additional overpressure arises in the further chamber and in the first subchamber. | 09-15-2011 |
20120020815 | COMPRESSOR AND OXYGEN CONDENSING DEVICE - Provided is a compressor, and an oxygen concentrator, that achieve low noise by which the noise does not leak directly to the exterior upon generation of compressed air through suction of raw air, and that allow reducing power consumption of a driving motor. | 01-26-2012 |
20130266457 | SQUARE SHOULDER METERING ROD - A metering rod assembly for a pressure sensitive droop flow pump is provided. The assembly includes a metering rod having a first section with a first diameter and a second section with a section diameter, the second diameter larger than the first diameter. A shoulder is formed at a junction of the first section and second section, the shoulder extending radially perpendicular to the first section. | 10-10-2013 |
20130323091 | Hydraulic System and Pressure Limiting Valve - A hydraulic system has at least one consumer and at least one hydraulic pump. A pressure limiting valve for limiting the maximum system pressure is connected with the at least one hydraulic pump, and the pressure limiting valve is pilot-controlled for switching a bypass. The invention also concerns a pressure limiting valve for limiting the system pressure inside such a hydraulic system. | 12-05-2013 |
20140119956 | Bypass Directional Control Valve - A bypass directional control valve has a valve sleeve, and two sets of outlet ports on each of two axial sides of the inlet ports. The outlet and the inlet ports all are formed to be cylindrical holes, and a diameter of the inlet ports is greater than a diameter of the outlet ports. A valve sleeve, a spool, a fluid flow system and a method are all also disclosed. | 05-01-2014 |
20140161639 | PRESSURE TRANSDUCER - A pressure transducer, particularly to be installed in liquid pumping devices, comprising a cup-shaped container from the bottom of which a connector protrudes for connection to a pressurized duct; the connector and the bottom are traversed by a through hole for the passage of fluid inside the transducer to a pressure sensor; the transducer comprises elements for locking the pressure sensor in a single possible orientation inside the container and elements for preventing the extraction of the pressure sensor to from the container. | 06-12-2014 |
20140234132 | Pump, In Particular Pneumatic Pump - The invention relates to a pump comprising a housing ( | 08-21-2014 |
20140255220 | PUMP AND CHECK RING THEREOF - The present invention relates to a pump, which comprises a pump body, a pair of check rings and a pneumatic control valve. When the pneumatic control valve is operated, a main shaft in the pump body is enabled to reciprocally move in a shaft hole, thereby enabling two diaphragms to be stretched and compressed at the same time for performing the compressing and the sucking stroke for the liquid; when subject to the hydraulic pressure, an arc-shaped convex ring of each of the check rings is deformed, and a contract ring is contracted for enclosing the main shaft thereby forming a liquid checking effect; when each of the check rings is not subject to the hydraulic pressure or the air pressure, the arc-shaped convex ring is not deformed thereby forming a slit between the contract ring and the main shaft. | 09-11-2014 |
20140286799 | AIR COMPRESSOR HAVING BUFFERING COMPARTMENT - An air compressor assembly includes a cylinder housing, an outlet receptacle disposed on the cylinder housing, and a partition having an air passage formed between the cylinder housing and the outlet receptacle, and a piston slidably received in the cylinder housing for generating a pressurized air, the partition includes a channel communicating with the chamber of the cylinder housing, and the cylinder housing includes a compartment formed in a casing and communicating with the channel of the partition for partially receiving the pressurized air and for buffering purposes. A regulating valve is engaged in the casing for adjusting the volume of the compartment of the casing. | 09-25-2014 |
20150017029 | PRESSURE OVERSHOOTING PREVENTION SYSTEM FOR ELECTRONIC HYDRAULIC PUMP IN HYDRAULIC SYSTEM - The present disclosure relates to a pressure overshooting prevention system for an electronic hydraulic pump in a hydraulic system, in which a flow rate command is added (+), a discharge flow rate is subtracted (−), a displacement flow rate (Delta Q) is calculated, a first pressure command corresponding to the displacement flow rate (Delta Q) is generated, a working fluid pressure value corresponding to the discharge flow rate is generated, a limit pressure command is generated to limit an increasing gradient of the working fluid pressure value, a stall is determined based on a first rate of change of the flow rate command, and a second rate of change of the discharge flow rate, and the limit pressure command is set to a second pressure command when the stall is determined, and a small value of the first pressure command and the second pressure command is selected as a final pressure command so as to control an electronic proportional control valve, thereby reducing overshooting of the electronic hydraulic pump. | 01-15-2015 |
20150308426 | Unloader Valve Apparatus for an Air Compressor - An unloader valve apparatus is provided for an air compressor. The unloader valve apparatus comprises a cylindrical piston having a longitudinal central axis and movable along the longitudinal central axis between a loaded position and an unloaded position. The unloader valve apparatus further comprises a stopper member pivotable about a pivot axis between a blocking position in which the stopper member blocks an unloader port when the piston is in the loaded position and an unblocking position in which the stopper member is not blocking the unloader port and is thereby allowing compressed air from the compressor to flow through the unloader port when the piston is in the unloaded position. | 10-29-2015 |
20160003235 | APPARATUS USING ELECTRONICALLY-CONTROLLED VALVES - The pumps and pressure controllers described herein aim to pump fluid in two directions, such as from a first port to a second port and vice versa. The pressure controllers aim to control pressure in a system or device, such as a test device, accurately and precisely at a variety of different pressure levels. Generally described, the pumps and pressure controllers described herein may include two or more control valves, which may be actuatable in such a manner so that the pump or pressure controller can switch between operating as a vacuum pump and operating as a compressor. In some embodiments, the pressure controllers may be able to adjust a pressure in the device by small increments thereby providing increased control of the pressure in the device over the prior art. Furthermore, the pressure controllers may be able to control the pressure of a system having low pressure levels. | 01-07-2016 |
20160017881 | DIAPHRAGM PUMP - A diaphragm pump includes a bypass valve and spring that are easy to install and do not require support by a special plug or mounting bracket. The pump outlet is perpendicular to the input, causing the bypass valve and spring to operate laterally as seen from the pump base. When installed, the bypass spring is suspended between the bypass valve and a simple “T” insert that is held in place within the pump by interior elements of the pump, without need for a special plug or bracket. The longitudinal strength of the housing is increased by providing a cone-shaped outer wall having a scalloped inner surface. The conical shape enhances the housing's resistance to longitudinal forces applied to the diaphragm. The cusps of the scalloped shape provide wall support ribs and locations for assembly screws, while increasing the interior volume and reducing the pump weight. | 01-21-2016 |
20160160825 | High-Pressure Fuel Pump - A high-pressure fuel pump includes a pressurizing chamber for pressurizing fuel, an outlet valve for discharging the fuel pressurized in the pressurizing chamber to an outlet passage, a relief passage for connecting the outlet passage located downstream of the outlet valve and the pressurizing chamber with each other while bypassing the outlet valve. A relief valve device is provided in the relief passage and adapted to open when an internal pressure of the outlet passage becomes higher than that of the pressurizing chamber, thereby providing communication between the outlet passage and the pressurizing chamber. The relief valve includes a relief spring mechanism for pressing a relief valve to a relief valve seat. At least the relief spring mechanism among members of the relief valve device is provided outside the pressurizing chamber in the pump body. | 06-09-2016 |
417308000 | Having additional relief or bypass valve | 1 |
20160176266 | COMPRESSOR COMPRISING A PRESSURE-RELIEF GROOVE | 06-23-2016 |
417309000 | Responsive to pump inlet condition | 3 |
20080240941 | Vehicular oil pump control apparatus - A control apparatus for controlling two oil pumps which are provided on a vehicle wherein the two oil pumps are selectively driven by respective different drive power sources such that one of the two oil pumps is operated while the other oil pump is held at rest, the control apparatus including an air removal control portion configured to temporarily operate the above-indicated other oil pump during an operation of the above-indicated one oil pump, to remove air staying at and around an oil inlet of the above-indicated other oil pump. | 10-02-2008 |
20090053078 | HYDRAULIC CONTROL SYSTEM - A hydraulic control system for controlling preferably at least two consumers, has a pump supplying the consumers with a pressure medium and having an adjustable pump capacity, an adjustable metering orifice assigned to each of the consumers, a power-beyond connection to which at least one power-beyond consumer is attachable, an inlet pressure scale connected downstream of the pump and provided in a pressure medium flow path between the pump and at least one of the two consumers, wherein the power-beyond connection branches off in the pressure medium flow path between the pump and the inlet pressure scale, a spring with a force acting upon the inlet pressure scale in a closing direction, an inlet having a pressure acting upon the inlet pressure scale in an opening direction, wherein the inlet pressure scale is configured so that it is actable upon in the closing direction selectively by either a highest load pressure or by a pressure that is greater than the highest load pressure. | 02-26-2009 |
20090104049 | Sliding Vane Pump - The present disclosure provides a fluid pump having a pump motor a pump drive shaft and a vane pump assembly. The vane pump assembly includes pump housing with a fluid inlet port in a distal portion of the housing and a fluid outlet port in a proximate portion. A first bearing member, having a plurality of inlet orifices in flow communication with the fluid inlet port, is disposed within the housing distal portion. A cam ring is adjacent the first bearing member. A rotor, which is on mounted the pump drive shaft, is disposed within an opening in the cam ring. This rotor includes a plurality of radial slots and vanes slidably received within the slots. A second bearing member, having a plurality of outlet orifices in flow communication with the fluid outlet port, is lo disposed within the housing proximate portion adjacent the cam ring. An end plate is also mounted within the distal portion of the pump housing. Rotation of the rotor by the drive shaft causes fluids from the fluid inlet port to be drawn through the plurality of inlet orifices at an initial fluid pressure. The fluid are then directed along a plurality of fluid flow paths disposed between an inner surface of the cam ring and an outer surface of the rotor, and then ejected through the plurality of outlet orifices to the fluid outlet port at a second fluid pressure which is greater than the initial fluid pressure. | 04-23-2009 |
417310000 | Rotary expansible chamber pump | 17 |
20080206075 | Compressor Having a Dual Slide Valve Assembly - A compressor having a dual slide valve assembly is disclosed. The slide valve assembly includes: i) a volume slide valve mechanism that is slidably movable to control compressor volume ratio and power input to the compressor; and ii) a capacity and volume slide valve mechanism that is in operational association with the volume slide valve mechanism, and the capacity and volume slide valve mechanism is slidably movable to control compressor capacity and to control volume ratio and power input to the compressor. In at least some embodiments, the compressor is a rotary gas compressor for a compression (e.g., refrigeration) system. A method of increasing compressor efficiency using the dual slide valve assembly is also disclosed. Compressor volume load and/or volume ratio and/or compressor power input can be simultaneously controlled by both the volume slide mechanism and the capacity and volume slide mechanism. Advantageously, compressor efficiency is increased. | 08-28-2008 |
20080253904 | Oil pump pressure control device - A device for reducing friction in a variable flow rate oil pump in which two discharge ports are provided and which uses three rotors while maintaining characteristics identical to the pressure characteristics of a common oil pump. The device is configured from a first discharge passage to an engine, a return passage that returns to an intake side of an outer circumferential side rotor, a second discharge passage to the engine, a return passage that returns to an intake side of an inner circumferential side rotor, and a pressure control valve whose valve main body is provided between a discharge port from the inner circumferential side rotor and the first discharge passage. The first discharge passage and second discharge passage are coupled, and a flow passage control is executed in each of: a low revolution range in a state in which only the first discharge passage and the second discharge passage are open; an intermediate revolution range in a state in which the first discharge passage and second discharge passage are open and a first intake side of the return passage is closed while a second intake side of the return passage is open; and a high revolution range in a state in which the second discharge passage is closed while the first discharge passage and the return passage are open. | 10-16-2008 |
20080317610 | Capacity Variable Type Rotary Compressor and Driving Method Thereof - Disclosed is a capacity variable type rotary compressor and a driving method thereof. In the compressor, a first discharge port ( | 12-25-2008 |
20090028724 | SELF-MODULATED SCROLL COMPRESSOR WITH OPTIMIZED BUILT-IN VOLUME RATIO - A self-modulating scroll compressor includes a built-in volume ratio that is defined as the ratio of a volume of a compression pocket just after completion of suction, i.e. at a beginning of a compression cycle, to the volume of the compression pocket just prior to discharge, i.e. at the end of the compression cycle. The built-in volume ratio can be controlled by the geometry of the scrolls and can be modified by, for example, extending the wrap or adding more turns to the wrap. Because the built-in volume ratio decreases to an effective volume ratio at lower capacity operation, the built-in volume ratio is at least 2.4 in order to optimize overall compressor efficiency. | 01-29-2009 |
20090041594 | VARIABLE DISPLACEMENT TYPE GEAR PUMP - In a variable displacement type gear pump, each of a main gear pump portion and a sub gear pump portion has a drive gear, a driven gear engaging with the drive gear, and an urging portion applying radial load to the drive and driven gears. A bypass passage returns fluid in a discharge-side space of the sub gear pump portion to a suction passage. An opening and closing valve opens the bypass passage in a small displacement operational state. A drive shaft supports the main drive gear and the sub drive gear. A driven shaft supports the main driven gear and the sub driven gear. The drive gears and the driven gears are rotated in accordance with a rotation of the drive shaft. The drive and driven shafts transmit the radial load in the main gear pump portion to the sub gear pump portion in the small displacement operational state. | 02-12-2009 |
20090047147 | VARIABLE DISPLACEMENT VANE PUMP - A variable displacement vane pump includes a drive shaft; a rotor formed with slots; vanes received by the slots; a cam ring which can become eccentric and cooperates with the rotor and vanes to define pump chambers; suction and discharge ports opened to the pump chambers; a sealing member dividing a space on an outer circumferential surface of the cam ring into first and second fluid pressure chambers; a metering orifice formed on a discharge passage connected with the discharge port; and a pressure control section adapted to control a pressure which is introduced into the first or second fluid pressure chamber. The pressure control section includes a high pressure chamber into which an upstream pressure of metering orifice is introduced, a medium pressure chamber into which a downstream pressure of metering orifice is introduced, and a low pressure chamber connected with a reservoir tank. The vane pump further includes a relief valve adapted to drain the downstream pressure of metering orifice to the reservoir tank; and a variable metering mechanism configured to narrow an area of the metering orifice at least when the relief valve is opened. | 02-19-2009 |
20090074593 | Apparatus For Preventing Vacuum Of Scroll Compressor - An apparatus for preventing vacuum of a scroll compressor, comprising: a fixed scroll having a bypass hole through which a suction chamber of a casing is connected to a discharge chamber of the casing; a valve block having an inner channel through which the bypass hole of the fixed scroll is connected to the discharge chamber of the casing, and fixedly installed at the fixed scroll; and a valve member disposed between the bypass hole of the fixed scroll and the inner channel of the valve block, for opening and closing between the bypass hole and the inner channel. Since the apparatus is assembled at an outer periphery of the fixed scroll, a processing error of the fixed scroll is prevented thereby to reduce a production cost. Also, since foreign materials generated when a refrigerant channel is processed does not remain in a valve hole, the valve member is prevented from being mal-operated, a productivity is enhanced, and a fabrication cost is reduced. | 03-19-2009 |
20090110570 | Scroll compressor - The present invention relates to a scroll compressor. The scroll compressor is configured to have bypass holes communicated with compression chambers so as to bypass a part of a compressed refrigerant and thus to modulate a capacity of the compressor, a middle pressure chamber and a valve. Accordingly, it is capable of simplifying a capacity modulation apparatus of the scroll compressor, thereby miniaturizing the compressor and reducing a fabrication cost. And, as the bypass holes are disposed to be adjacent to each other, an operating capacity of the compressor can be easily modulated with only one bypass valve, accordingly it is capable of reducing the number of bypass valve and of enhancing reliability. | 04-30-2009 |
20100008797 | ELECTRIC PUMP UNIT AND ELECTRIC OIL PUMP - An electric pump unit which comprises an outer rotor having a trochoidal tooth profile and an inner rotor which meshes with the outer rotor in such a state the inner rotor and the outer rotor are placed eccentric relative to each other for rotation and also comprises a pump part which is accommodated in a bottomed cylindrical pump housing. A low pressure portion and a high pressure portion are formed by both the rotors, and oil is made to be sucked and discharged through an inlet port and an outlet port which communicate respectively with the low pressure portion and the high pressure portion. A relief valve is provided for circulating oil from the high pressure portion to the low pressure portion when an oil pressure at the high pressure side reaches or exceeds a predetermined pressure. | 01-14-2010 |
20100054963 | VARIABLE DISPLACEMENT ROTARY PUMP - A variable displacement rotary pump includes a main pump unit, an auxiliary pump unit, a discharge passage, a bypass passage, a suction passage, a check valve and a control valve. The suction passage is in communication with the discharge passage through the bypass passage and a second discharge port. The check valve is disposed in the discharge passage for preventing fluid in a first discharge port of the main pump unit from flowing into the bypass passage. The control valve is operable for opening and closing the bypass passage. When the control valve opens the bypass passage and the check valve closes the discharge passage, flow rate of the fluid discharged from the discharge passage is reduced. A throttle passage is provided in the bypass passage or the control valve for regulating flow of the fluid in early phase of operation of the control valve to open the bypass passage. | 03-04-2010 |
20100158710 | SCROLL COMPRESSOR - A compressor includes a housing, a fixed scroll, a movable scroll and a control valve. The housing has a suction chamber, a discharge chamber and a backpressure chamber formed therein. The scrolls are pressed against each other by backpressure in the backpressure chamber. The control valve for controlling the backpressure has first, second and third chambers arranged in this order. The first, second and third chambers are connected to the discharge chamber, the backpressure chamber and the suction chamber, respectively. The control valve has a valve member. The valve member has a first pressure-receiving surface located in the first chamber, a second pressure-receiving surface located in the second chamber and a third pressure-receiving surface located in the third chamber. The area of the third pressure-receiving surface is larger than the area of the first pressure-receiving surface and larger than the area of the second pressure-receiving surface. | 06-24-2010 |
20100183453 | SCROLL COMPRESSOR WITH THREE-STEP CAPACITY CONTROL - A scroll compressor comprises a first scroll member having a generally spiral wrap and a second scroll member having a generally spiral wrap. The generally spiral wraps interfit to define compression chambers. A pair of ports leads from the compression chambers. A pair of valves selectively blocks flow of refrigerant from the ports leaving the compression chambers. The valves selectively control the flow such that flow may pass from neither of the two ports, from both of the two ports, or from only one of the two ports to provide three levels of capacity control. | 07-22-2010 |
20100183454 | ROTARY DISPLACEMENT PUMP - A rotary displacement pump ( | 07-22-2010 |
20100202904 | SCREW COMPRESSOR PULSATION DAMPER - A slide valve for use in a screw compressor comprises a main body portion configured for sliding in a pressure pocket of a screw compressor to regulate output of a working matter through screw rotors of the compressor. The main body of the slide valve includes a plurality of walls that define an enclosed interior cavity. The slide valve also includes a bore extending into a wall of the main body such that working matter discharged from the screw rotors has access to the enclosed interior cavity. The bore is sized to dampen pressure pulsations in the discharged working matter as the discharged working matter flows through the bore. | 08-12-2010 |
20110064590 | Valve Arrangement for Peripherally Pivoted Oscillating Vane Machine - The present invention relates to improved integrated valve assemblies, preferably, for use in an oscillating vane machine (OVM) that provide easy assembly and maintenance, direct fluid communication between the working chamber and suction and discharge manifold, and the avoidance of the use of fasteners in contact with or adjacent to the working chamber. | 03-17-2011 |
20110135509 | SCROLL COMPRESSOR CAPACITY MODULATION WITH HYBRID SOLENOID AND FLUID CONTROL - A scroll compressor includes a compressor shell having first and second scroll members. The scroll members each have a base and a generally spiral wrap extending from its base. The generally spiral wraps of the first and second scroll members interfit to define compression chambers. A shaft causes the second scroll member to orbit relative to the first scroll member. At least one bypass port is formed in a base of one scroll member, and communicates with at least one of the compression chambers. The bypass port communicates with a passage leading to a suction pressure chamber within the compressor shell. A solenoid valve is movable between a reduced capacity position and a full capacity position, and selectively supplies a pressurized fluid to a fluid valve associated with the bypass port, such that movement of the solenoid can control whether the bypass port is open or closed. | 06-09-2011 |
20160377078 | PUMP DEVICE - A pump device includes a pump, a flow control valve having a spool that returns a part of working fluid discharged from the pump to a suction side, and a differential pressure adjusting device that adjusts a differential pressure acting on both end portions of the spool to a target differential pressure, and the differential pressure adjusting device includes a pressure regulating chamber that communicates with a second fluid pressure chamber and a pilot chamber into which pressure in the discharge channel is guided: and a pressure in the pressure regulating chamber is adjusted such that a differential pressure between the pressure in the pressure regulating chamber and a pressure in the pilot chamber becomes the target differential pressure. | 12-29-2016 |
417311000 | Adjustable spring loaded valve | 2 |
20090116976 | HIGH-PRESSURE LIQUID SUPPLY PUMP - An object of the present invention is to reduce the pressure loss in a relief valve employed for a high-pressure liquid supply pump. Disclosed is a high-pressure liquid supply pump for pressurizing a liquid and supplying the pressurized liquid from a low-pressure side to a high-pressure side. The pump includes a relief path which releases the pressurized liquid from the high-pressure side to the low-pressure side, and a relief valve which is positioned in the relief path and equipped with an intermediate chamber, a valve seat positioned toward the high-pressure side of the intermediate chamber, a ball valve that is attachable to and detachable from the valve seat, and a ball valve retainer for pressing the ball valve against the valve seat. The relief path is configured so that an inflow path to the intermediate chamber and an outflow path from the intermediate chamber both produce a restriction effect. The ball valve retainer has a pressure reception surface for receiving the pressure from the intermediate chamber. A first pressure reception area, which detaches the ball valve from the valve seat upon receipt of liquid pressure of the pressurized liquid from a high-pressure section when the relief valve closes, is smaller than a second pressure reception area, which lifts the ball valve and the ball valve retainer upon receipt of liquid pressure from the intermediate chamber. | 05-07-2009 |
20120148423 | LUBRICANT PUMP SYSTEM - A lubricant pump system may include a lubricant pump controlled by a proportional valve. An actuating unit may be disposed in the lubricant pump and configured to control a delivery output of the lubricant pump. A first pressure chamber and at least one second pressure chamber may be configured to adjust the actuating unit against a spring, wherein the second pressure chamber is smaller than the first pressure chamber. In response to a failure of the proportional valve, the lubricant pump may be exclusively pressurized via the at least one second pressure chamber. | 06-14-2012 |