| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 417254000 | Reciprocating rigid stages | 26 |
| 20080199327 | Apparatus and Method For Compressing a Gas - An apparatus and method for compressing a gas is disclosed. A compressor, in particular a piston compressor, has a low pressure stage for compressing the medium from an inlet pressure to an intermediate pressure, and has a high pressure stage for compressing the medium from the intermediate pressure to a high pressure. A compensating volume with an adjustable dead volume is connected upstream of the high pressure stage. | 08-21-2008 |
| 20080310971 | PISTON PUMP - A piston pump includes a first piston pump including a first piston and a first pump chamber, a second piston pump including a second piston and a second pump chamber, the second piston operating to follow the first piston, a pressure release passage formed in communication with the second pump chamber, and a relief valve provided at the pressure release passage and defining an upper limit discharge pressure of the second piston pump. When a discharge pressure of the second piston pump is equal to or smaller than the upper limit, a discharge fluid of the second piston pump is added to that of the first piston pump so as to flow into an outlet port. When the discharge pressure exceeds the upper limit, the discharge fluid is released to the pressure release passage and the discharge fluid of the first piston pump only flows to the outlet port. | 12-18-2008 |
| 20090060756 | Two-Chamber Blood Pump - The present invention provides a fluid pump for medical applications. The invention comprises a flexible cassette containing two pump chambers, wherein the first pump chamber is larger than the second pump chamber. The pump includes two pistons, one for each pump chamber. The first piston pushes fluid from the first chamber to the second, and the second piston pushes fluid from the second chamber downstream out of the pump. Three valves are coordinated with the action of the pistons to control fluid flow into and out of the pump chambers by applying and releasing pressure to and from specific points of the flexible cassette. A control system controls the operation of the pistons and valves and directs the pistons to be advanced according to a time-varying velocity profile. The first pump chamber passively fills and then rapidly expels the collected fluid into the second chamber at low pressure. The second chamber, once filled, expels the fluid downstream at high pressure, producing a pulsatile pressure profile downstream. | 03-05-2009 |
| 20090214361 | OIL-LESS COMPRESSOR WITH SEAL-DUST PROTECTION - An oil-less compressor, having polymeric seals and a crank mechanism which is vulnerable to dust arising from such seals, is provided with a dust-exclusion barrier that protects the crank mechanism from being exposed to such dust. The first stage of the compressor preferably draws its intake from the crankcase, providing a pressure differential and gas flow that sweeps seal dust away from the crank mechanism. | 08-27-2009 |
| 20090220358 | UNEQUAL LENGTH ALTERNATING HYDRAULIC CYLINDER DRIVE SYSTEM FOR CONTINUOUS MATERIAL OUTPUT FLOW WITH EQUAL MATERIAL OUTPUT PRESSURE - A hydraulic pumping system is provided for delivering a compressible fluid material from a hopper to an outlet. A primary hydraulically driven pumping unit has a first interior volume for receiving the fluid material from the hopper. A secondary hydraulically driven pumping unit is interconnected with the primary hydraulically driven pumping unit and has a second interior volume less than the first interior volume for receiving fluid material from the primary hydraulically driven pumping unit. The primary and secondary hydraulically driven pumping units have hydraulically driven reciprocating piston units with unequal stroke lengths. The piston units are alternately reciprocated to fill the first interior volume of fluid material from the hopper, pump a portion of the first interior volume of fluid material into the second interior volume and the remainder of the first interior volume to the outlet, and pump the second interior volume of fluid material to the outlet while fluid material is being pulled into the first interior volume in a sequential and simultaneous manner which will produce substantially continuous delivery of fluid material to the outlet. | 09-03-2009 |
| 20090311114 | MULTI-STAGE PISTON COMPRESSOR - A multi-stage piston compressor is provided with at least two piston-cylinder units, which respectively comprise a separate linear drive for moving the piston. A control device is also provided, which is designed in a manner such that the linear drives may be controlled individually with regard to speed and stroke. | 12-17-2009 |
| 20100014992 | RECIPROCATING POSITIVE-DISPLACEMENT COMPRESSORS - A positive-displacement reciprocating compressor comprising a “non-conventional” crank mechanism which eliminates the amount of frictional force between the wall of the piston and the wall of the cylinder, whose characteristic feature is to have a planet (20) made of sintered material, with self-lubrication properties, allowing to eliminate bushings or similar additional elements. An economical and structurally simple lubrication system, which preferably comprises a classical link rod/crank mechanism, utilizes the mechanical energy provided by the drive shaft of the compressor and sends the lubricant (oil) in a precise manner to the surfaces that need to be lubricated. This oil is easily retained by the very small grains of the sintered material. Moreover, a valve system based on a single plate simplifies the structure of the cylinder unit (30). | 01-21-2010 |
| 20100040485 | High Pressure Dual-Action Hydraulic Pump - A high pressure pump includes a pump housing. A piston rod located within the pump housing defines a plurality of pump cavities and a plurality of piston cavities. Movement of the piston within the piston cylinder pumps the fluid from the piston cavities out of the high pressure pump. The continuous pumping of HWBF from the pump housing provides fluid at a relatively constant flow and pressure. The HWBF pressure is also at a higher pressure than traditional single stage high pressure pumps can provide. | 02-18-2010 |
| 20100135827 | TANDEM PISTON PUMP - In a tandem piston pump ( | 06-03-2010 |
| 20100150746 | COMPRESSOR - The invention relates to a compressor ( | 06-17-2010 |
| 20100303645 | Reciprocative Compressor - This invention provides a swing-type reciprocative compressor capable of maintaining long durability and preventing propagation of heat to the large end portion of a piston, even under high-compression. | 12-02-2010 |
| 20110085922 | Converter for Converting Mechanical Energy Into Hydraulic Energy and Robot Implementing Said Converter - The invention relates to a converter for converting mechanical energy into hydraulic energy and to a robot implementing said converter. The invention can particularly be used in the production of humanoid robots in which autonomy is to be improved. The converter includes a shaft rotated by mechanical energy about a first axis relative to a casing, a hub comprising a bore formed about a second axis, the shaft rotating in the bore, the two axes being parallel and a distance between the axes forming an excentricity, at least two pistons capable of movement in a radial housing of the shaft, the piston bearing against the bore. According to the invention, the movement of the piston feeds a hydraulic fluid into two annular grooves of the casing arranged in an arc of a circle about the first axis, the hydraulic energy being generated by a pressure difference of the fluid present between the two grooves, and the hub is capable of translation along a third axis perpendicular to the first two axes in order to modify the value of the excentricity between two extreme values, one being positive and the other being negative, so as to generate an inversion of the fluid pressures in the grooves, thereby reversing the inlet and discharge roles of these grooves while maintaining the same rotation direction for the shaft. | 04-14-2011 |
| 20110171044 | MULTI-STAGE RECIPROCATING COMPRESSOR - A multi-stage reciprocating compressor includes a cylinder block and a cylinder head. The cylinder block defines a low stage cylinder and a high stage cylinder. The cylinder head is secured to the cylinder block overlying the low and high stage cylinders. The cylinder head defines a mid-stage plenum which is in fluid communication with the low stage cylinder and the high stage cylinder for communicating a working fluid discharged from the low stage cylinder to the high stage cylinder. | 07-14-2011 |
| 20110274563 | DOSING PUMP - A dosing pump comprises an inlet for a solvent, an injection device for an additive, a reciprocating main piston for mixing the solvent with the additive during a suction stroke and for discharging the mixture from an outlet in an evacuation stroke. A divider substantially perpendicular to a rod connected to the main piston separates a main piston housing from a switching device for controlling a main piston stroke direction. The switching device comprises two inlet rotary valve assemblies that are disposed externally to a corresponding inlet aperture bored in the divider when in an opened state and are rotatable about an axis substantially perpendicular to the axis of the main piston. Each of the valve assemblies alternately opens and occludes a corresponding inlet aperture so that solvent flowing through a first inlet aperture performs a suction stroke and solvent flowing through a second inlet aperture performs an evacuation stroke. | 11-10-2011 |
| 20120282118 | Reciprocation Pump And A Dialysis Apparatus Equipped With The Reciprocation Pump - A reciprocation pump has a supply liquid-side sub-pumping chamber and a waste liquid side sub-pumping chamber for containing and sending out liquid adapted to communicate with the supply liquid-side pumping chamber and with the waste liquid-side pumping chamber, respectively. The supply liquid-side sub-pumping chamber and the waste liquid-side sub-pumping chamber are interlocked with a reciprocation mechanism to vary their volume reversely to that of the volume variation of the supply liquid-side pumping chamber and the waste liquid-side pumping chamber, respectively. The reciprocating motion of the reciprocation mechanism enables the liquid to be supplied to the objective apparatus through the supply liquid-side pumping chamber and the supply liquid-side sub-pumping chamber. Also, it enables the waste liquid from the objective apparatus to be discharged to the outside through the waste liquid-side pumping chamber and the waste liquid-side sub-pumping chamber. | 11-08-2012 |
| 20140241910 | SUBMERSIBLE PUMP - A submersible pump includes a fluid-end section, a power-end section, a top connection sub and an umbilical. The fluid-end section includes a tubular fluid-end barrel, an upper piston disposed within the fluid-end barrel bore, and a traveling valve disposed at the upper piston upper end. The power-end section includes a tubular hydraulic cylinder. A lower piston disposed within the hydraulic cylinder bore is connected to the upper piston. The top connection sub connected to the fluid-end barrel upper end has a discharge port and a standing valve disposed below the discharge port. The umbilical includes first and second tubing strings providing fluid communications between a prime mover and the hydraulic cylinder bore below and above the lower piston face, respectively. A third tubing string provides fluid communications between a wellhead and the top connection sub discharge port. | 08-28-2014 |
| 417258000 | Reciprocating cylinder and piston | 3 |
| 20090285697 | High Pressure Air Pump - A multiple-chamber, multiple-stage reciprocal pump for compressing air through a series of up-strokes and down-strokes. The pump includes an upper reciprocal portion and a fixed portion. The fixed portion further includes a base housing with an ambient air inlet cavity and a compressed air outlet cavity formed therein. It further includes an outlet valve body fixed to the base housing with an outlet valve pneumatically coupled to direct high-pressure compressed air into the outlet cavity. The outlet valve body also has an inlet port pneumatically coupled to the inlet cavity, and there are plural cylinders coupled to the outlet valve body, which slideably and sealably engaged with the upper reciprocal portion, thereby enabling the series of up-strokes and down-strokes to compress air. | 11-19-2009 |
| 20130115113 | RECIPROCATING COMPRESSOR - The present invention relates to a reciprocating compressor. The present invention can reduce the size of the compressor by closely attaching and securing a reciprocating motor and a cylinder of a compression part to a sealed receptacle to reduce a gap between a main body of the compressor and the sealed receptacle. In addition, an assembling process for the compressor can be simplified by separating a mover of the reciprocating motor and a piston of the compression part from each other. In addition, the vibration of the sealed receptacle can be minimized by properly adjusting the mass of the components in the reciprocating motor and the compression part, and the elasticity of a spring for supporting the reciprocating motor and the compression part to offset the force applied to the sealed receptacle. In addition, the efficiency of the reciprocating motor can be enhanced by increasing the relative velocity of the reciprocating motor in comparison with the relative velocity of the compression part. | 05-09-2013 |
| 20150078929 | DRAINING DEVICE - A draining device includes a draining mechanism, two conduits, and a driving mechanism. The draining mechanism includes a first cylinder defining a cavity, a first cover and a connecting member mounted on two opposite ends of the first cylinder respectively, a piston rod extending through the connecting member, and a first piston assembly mounted on the piston rod. The first cover defines a first draining hole, the connecting member defines a second draining hole. The two conduits is coupled to the first cylinder corresponding to the first and the second draining holes respectively, and communicating with the cavity. Each of the two conduits includes a first conduit and a second conduit. A first and a second check valves are positioned in the first and the second conduits respectively. The driving mechanism is mounted on the connecting member, configured to drive the piston rod to slide in the first cylinder. | 03-19-2015 |
| 417259000 | Including valved piston | 1 |
| 20150337821 | MULTISTAGE AIR PUMP - A multistage air pump has a cylinder assembly, a second piston assembly slidably mounted through the cylinder assembly, and a first piston assembly protruding in the second piston assembly. Multiple chambers are defined in the multistage air pump, and communicate with each other via multiple one-way mechanisms. Air drawn into the multistage air pump is compressed in multiple stages within a single push, such that a large amount of high pressure air is provided. | 11-26-2015 |
| 417266000 | Three or more | 4 |
| 20090047144 | Fluid Compressor and Motor Vehicle Refuelling Apparatus - A fluid compressor | 02-19-2009 |
| 20120244018 | PUMPING DEVICES, SYSTEMS INCLUDING MULTIPLE PISTONS AND METHODS FOR USE WITH MEDICAL FLUIDS - In one aspect, a system for delivery of a medical fluid to a patient includes a pump system including a plurality of at least three chambers. Each of the plurality of chambers includes an inlet through which fluid is drawn into the chamber and an outlet from which fluid is expelled from the chamber. The pump system further includes a common outlet channel in fluid communication with the outlet of each of the plurality of chambers and a plurality of at least three pistons. Each of the pistons is slidably disposed within a respective one of the plurality of chambers. The system further includes a drive system including a cam shaft including a plurality of at least three cam lobes. Each of the plurality of cam lobes has a profile. The drive system further includes a plurality of at least three cam lobe followers. Each of the cam lobe followers is in operative connection with a respective one of the plurality of cam lobes and is adapted to be placed in operative connection with a respective one of the plurality of pistons. The profile of each of the plurality of cam lobes is adapted to provide a transient increase or spike in calculated theoretical output of the pump system to reduce periodic variation in measured output thereof. | 09-27-2012 |
| 20130149173 | MULTISTAGE COMPRESSORS FOR PET BOTTLE BLOWING PROCESSES - A multistage reciprocating air compressor compresses air to an elevated pressure level discharge with an intermediate pressure level discharge for use in blow moulding of PET bottles and similar products. The air compressor has a first, second and third reciprocating piston stages, including respective inlet unloading means, with first, second and third actuating means operable in response to respective sensed discharge pressure levels from the discharges to actuate inlet unloading means. The elevated pressure level discharge being from the third stage and the intermediate pressure level discharge being from an interstage region between at least one of the first and second stages or the second and third stages. | 06-13-2013 |
| 20150322933 | RADIALLY CONFIGURED OIL-FREE COMPRESSOR - An oil-free compressor for a rail vehicle includes a compressor housing, a first low pressure piston cylinder supported in the compressor housing, a second low pressure piston cylinder supported in the compressor housing, a first high pressure piston cylinder supported in the compressor housing, a second high pressure piston cylinder supported in the compressor housing, and a crankshaft assembly supported by the compressor housing and linked to pistons of the piston cylinders by respective connecting rods. The first and second low pressure piston cylinders and the first and second high pressure piston cylinders are positioned in an X-shaped configuration around an outer circumference of the compressor housing. The first and second high pressure piston cylinders are configured as first and second lower legs of the X-shaped configuration, and the first and second low pressure piston cylinders are configured as first and second upper legs of the X-shaped configuration. | 11-12-2015 |
| 417267000 | Series double acting | 1 |
| 20100166573 | HIGH-PRESSURE GENERATION DEVICE - The high-pressure generation device ( | 07-01-2010 |
| 417268000 | Unidirectionally acting rigidly connected pumping members | 1 |
| 20080240937 | TWO STAGE RECIPROCATING COMPRESSOR AND REFRIGERATOR HAVING THE SAME - A two stage reciprocating compressor includes a casing. A first compressing unit is disposed in the casing and includes a first piston and a first cylinder, the first compressing unit being driven by a reciprocating motor to linearly reciprocate the first piston in the first cylinder to suck in and compress gas. A second compressing unit is disposed in the casing and includes a second piston and a second cylinder, the second compressing unit being driven by vibration of the first compressing unit to linearly reciprocate the second piston in the second cylinder to suck in and compress gas. A vibration transfer member transfers the vibration from the first compressing unit to the second compressing unit. The first and second compressing units extend in parallel and face in the same direction, the second compressing unit being located adjacent to a suction passage of the first compressing unit. | 10-02-2008 |
