117 results about "Pressure volume" patented technology

The invention relates to a sensor and guide wire assembly including a pressure sensor having a plurality of terminals, the sensor being mounted in the distal end region of a core wire. It also includes two to four electrodes for conductance measurement, also provided in the distal end region. Two electrodes are electrically insulated from each other.

An adjustable acupressure device is structured to apply pressure to a specific portion of a user's body, for example, the hegu point located between the user's thumb and forefinger. The device includes an attachment assembly having at least one placement indicator structured to permit accurate placement of the device by the user on his or her body. Further, the device includes a pressure assembly to allow the user to apply a preselected amount of pressure to the specific portion of the user's body. More in particular, the pressure assembly includes a pressure applicator structured to contact the specific point on the user's body when disposed in an operative position.

The invention relates to a device and method for testing molecular diffusion coefficients in a multi-component oil-gas system under high temperature and high pressure. The device consists of an inlet pump 1, an outlet pump 2, an intermediate container, a PVT (pressure-volume-temperature) cylinder 6, an oil-gas separator 7, a gas volume flow meter 8, a liquid phase density analyzer 10 and a chromatographic analyzer 9, wherein, one end of the intermediate container is connected with the inlet pump 1, and the other end of the intermediate container is connected with the PVT cylinder 6; the PVT cylinder is connected with the oil-gas separator 7; the separator is connected with the gas volume flow meter 8 and the liquid phase density analyzer 10; the gas volume flow meter and the liquid phase density analyzer are respectively connected with the chromatographic analyzer 9; and the other end of the PVT cylinder is connected with the outlet pump 2. The device has the advantages of reasonable principle and simple structure, and is convenient in operation; and by utilizing the method, the molecular diffusion coefficients of each component in a multi-component injected gas and actual crude oil system in gas phase and oil phase under the conditions of different reservoir temperature and pressure can be determined, thereby providing reasonable basic data for quantitative evaluation of influence of molecular diffusion effect on the enhancement of the recovery ratio by means of gas injection.

The present invention provides an objective bubble point pressure determination method enables new applications of downhole PV (Pressure Volume) test results such as in situ measurement of the bubble point pressure for use as a quality control parameter for sampling. The present invention provides a method and apparatus to fit data points to a curve and to smooth these points over an interval of N points. The derivative of the curve is determined to obtain peak acceleration. The peak acceleration represents the bubble point pressure. This bubble point pressure is verified by comparison to changes in fluid compressibility and visual observation of a pressure volume plot history.

The invention is a method to determine stress within a formation, the method comprising the steps of: providing a closed reference pressure volume within the formation; providing a flexible diaphragm which can be exposed on one side to formation, and on the other side to the closed reference pressure volume; providing a switch wherein the switch generates a signal based on the diaphragm being in a position indicative of the diaphragm being flexed by pressure on one side of the diaphragm being greater than pressure on the other side of the diaphragm; cycling a pressure within the reference pressure volume to between a pressure at which a signal is generated and a pressure at which a signal is not generated; and determining the formation stress as the pressure at which the signal changes. Another aspect of the invention is the apparatus useful in this method. The switch is preferably an electrical contact that is activated by movement of the diaphragm.

The invention provides a high precision single point positioning system of a single frequency global positioning system (GPS) and a method, which belong to the technical field of GPS positioning. The positioning system is provided with a single frequency GPS receiver which finishes the processing of a GPS baseband signal, tracing of a GPS signal and pressure-volume-temperature (PVT) resolving and provides required GPS observation data and various error correcting information for a precision single point positioning solving module. The receiving of various correction data and loading of information of international GPS service (IGS) precise ephemeris, clock error, ionospheric delay and the like are finished by wireless communication module general packet radio service (GPRS) through wireless networks. The wireless communication module GPRS performs ionospheric delay error correction, satellite clock error correction and satellite track error correction, and utilizes IGS network data to finish precision single point positioning processing. An ARM core plate receives various observation data, satellite-based augmentation system (SBAS) observation data and various correction data of the wireless communication module and performs automatic processing computing of precision single point positioning algorithm. The single frequency GPS high precision single point positioning system and the method have the advantages of being simple in data collection and high in precision, and the feasibility and flexibility of the precision positioning are improved.

A subatmospheric pressure desalinating still employs a closed top, open bottom pipe filled with source water to be distilled, such as seawater, having a height greater than the height of a column of seawater that can be supported by the pressure at the bottom of the tank so that a subatmospheric pressure volume is formed at the top. Water from the source is also pumped into the subatmospheric volume and passed through an evaporator which enlarges its surface volume. A small percentage of the water is vaporized and the balance is cooled to provide the heat of vaporization and falls into the top of the seawater column, creating a downward flow. The vapor is drawn from the vacuum and condensed, preferably in a second subatmospheric volume above a column of fresh water. A degasser for the water to be distilled prevents the accumulation of gases dissolved in the seawater or the like in the subatmospheric volume.

The invention discloses a method for water-flooding abandoned condensate gas reservoirs. The method includes performing full fluid PVT (pressure-volume-temperature) analysis first to complete long-core displacement experimental analysis. The long-core displacement experiment mainly includes the steps: selecting core samples on site; testing basic physical-property parameters of cores; splicing the core samples into a long core for displacement experiment, performing natural energy failure experiment, performing displacement in flooding, acquiring recovery rate of water-displacing condensate oil and condensate gas under different conditions according to the experiments, and comparing to determine the waterflood pattern which is most satisfactory to the requirement of increasing recovery rate of condensate gas reservoirs on site; and compiling a condensate gas reservoir water-flooding scheme according to indoor experiment results. The problem that existing depletion development of condensate oil-gas reservoirs is fast in energy decline, causes underground condensate oil loss and is low in production level is solved. Reasonable water-flooding speeds and water-flooding modes are optimally selected by the method and used for water flooding of abandoned condensate gas reservoirs, so that recovery rate of condensate oil-gas reservoirs is effectively increased.

The invention belongs to the field of studies on stability of rock and earth masses under a multi-field coupling effect, and particularly relates to a thermo-hydro-mechanical multi-physical field coupling simulation experiment system suitable for the rock and earth masses and a use method thereof. The thermo-hydro-mechanical (THM) coupling simulation experiment system mainly comprises a monitoring mainframe, a triaxial pressure test mainframe, a heat pump control circulating system, a GDS pressure-volume controller group and a data collector; by carrying out gradual in-depth studies on influence of a mechanical unloading process on the mechanical properties and the hydraulic properties of the rock and earth masses and the influence of temperature loads on the damage evolution law, the permeability and the thermal conductivity of the rock and earth masses on the surrounding of a chamber, and the interaction and mutual influence conditions between of a stress field and a seepage field (HM), between the stress field and a temperature field (TM) and between the seepage field and the temperature field (TH) are disclosed.

Method and water submerged device for generating a force under water. The device includes a low pressure recipient configured to contain a volume of a first fluid at a low pressure volume, an inlet connected to the low pressure recipient and configured to exchange a second fluid with an external enclosure, and a valve connected to the external enclosure and the inlet and configured to separate a pressure source in the external enclosure from the low pressure recipient. When the valve is open, such that there is a flow communication between the external enclosure and the low pressure recipient, a pressure imbalance occurs in the external enclosure which generates the force and the second fluid from the external enclosure enters the low pressure recipient and compresses the first fluid.

The invention discloses a fully-electric ultra-high speed injection molding PVT (Pressure Volume Temperature) online measurement and control method. By using a melt metered through plasticization in a cylinder as an object, a thermodynamic state (P0, T0, V0) of a highly-compressed melt before injection as a control starting point and the thermodynamic state (P1, T1, V1) of the melt in the cylinder after injection molding as a control ending point, through online detection of a PVT relation characteristic of a polymer in an ultra-high speed injection molding process, by depending on a high-pressure control system and a high-response executing mechanism of a fully-electric ultra-high speed injection molding machine and using the PVT relation characteristic of the ultra-high speed injection molded polymer as the guidance, precision control of ultra-high speed injection molding is realized. The fully-electric ultra-high speed injection molding PVT online measurement and control method has the advantages of high control precision and high cost performance.

The invention relates to a device for the automated determination of the PEEP of a patient. Said device comprises sensors and a suitable electronic system for determining a pressure-volume characteristic curve during a P / V manoeuvre. The electronic system is designed in such a way as to generate, specifically in terms of breathing pressure, the difference between “lung volume during exhalation (Vdef)” and “lung volume during inhalation (Vinf)”, and to determine the maximum value of said difference. The breathing pressure is then determined, for which the volume difference has a value defined in relation to the maximum value of the volume difference. The device calculates a PEEP value on the basis of said determined breathing pressure value.

A method and device for shunting fluid from high pressure volumes to low pressure volumes to treat various medical problems caused by an imbalance or malfunction of the regulation of flow between these volumes. Typical problems where the method and device are employed include the treatment of incontinence, treatment of hydrocephalus, treatment of elevated intra-cranial pressure, treatment of elevated intra-ocular pressure and the like. The controlled release of fluid from the high pressure volume is accomplished by inserting a sponge using an insertion device such as an endoscope. The sponge retains and releases fluid in response to a pressure differential between the high and lower pressure volumes. The sponge material may be natural or synthetic and sponges with different porosity and fluid retention are provided to achieve desired flow characteristics. The sponges can be provided with different shapes to allow it to conform to the anatomy and may have additional or integral modules that attach it to the anatomical structures.

The invention relates to a method and a device for measuring and representing the compression coefficient and the expansion coefficient of a material on line. A temperature sensor, a pressure sensor and an ultrasonic probe are respectively arranged on one cross section of a closed material cavity of a pressure-volume-temperature (PVT) calibration device and are used for testing the volume, the temperature T, the pressure P and ultrasonic signals of the closed material synchronously. The sound velocity of the ultrasonic wave, which passes through the material with the thickness l in the material cavity is c=l / delta t within the propagation time delta t; the temperature is maintained constant, and the pressure measurement volume is changed, so that a constant temperature compression coefficient can be obtained; the pressure is maintained constant, and the temperature measurement volume is changed, so that a constant pressure expansion coefficient can be obtained; a material specific volume, a compression coefficient or expansion coefficient and sound velocity correspondence curve is established, and a corresponding equation is obtained by regression; or the compression coefficient (alpha) and the expansion coefficient (beta) can be obtained by the specific volume curve or the state equation. At certain temperature and under certain pressure, the propagation velocity of the ultrasonic wave in the material can be tested on line, and the compression coefficient and the expansion coefficient at the temperature and under the pressure can be obtained by the established corresponding curve or corresponding equation. The method has the advantages of being lossless and being easy in online representation, and the device is simple and convenient to install.

The invention discloses a single-converted-to-double low noise amplifier with a highly balanced and stabilized differential output gain phase. The amplifier comprises a common source or common emitter input amplifying transistor pair which comprises a first transistor and a fourth transistor, a common gate or common base amplifying transistor pair which comprises a second transistor and a third transistor, a tail current source pipe and output load circuits with tight coupling differential inductors; a fourth inductor L4 and a fifth inductor L5 are tight coupling differential inductors; C1 and C2 are differential capacitors with the same capacitance values; L0 and L1 also are tight coupling differential inductors. For the amplifier disclosed by the invention, since output loads adopt the tight coupling differential inductors L4 and L5 and the differential capacitors C1 and C2 for resonance, the balance and the stability of the differential output gain phase are improved, and the high-impedance tail current source pipe M5 can well restrain a common mode signal. The amplifier disclosed by the invention has excellent robustness when the PVT (Pressure Volume Temperature) and a working frequency point are changed, and at the same time, the amplifier has an excellent anti-interference capacity for the medium base noise.

The invention provides a sensitive element based on pressure volume effect of a graphene filled silicone rubber composite material and a production method thereof and belongs to the technical field of sensing technology. The sensitive element comprises packaging films at the two outermost layers and a soft pressure volume material provided with the pressure volume effect and located in the middle. The packaging films are polyimide films combined with electrodes and leads, and the soft pressure volume material is the graphene filled silicone rubber composite material prepared by using a solution mixing method. The sensitive element is good in flexibility, thin in thickness, simple in process, low in cost and capable of being applied to fields of robot finger touch, large device narrow curved surface interlayer pressure monitoring and the like.

Systems and methods are provided for determining the pressure-volume relationship for one or more chambers of a heart. An implantable device includes a catheter including a distal end sized for introduction into a chamber of a heart, a pressure sensor for measuring pressure within the chamber, and a resistance sensor for measuring fluid resistance within the chamber. A processor coupled to the catheter obtains pressure data from the pressure sensor and fluid resistance data from the resistance sensor. The processor approximates fluid volume within the chamber as a function of time and determines one or more pressure-volume loops based upon the pressure data and the fluid volume. In one embodiment, the catheter is a lead including a pacing electrode and a controller including the processor delivers pulses to the pacing electrode based upon the pressure-volume loops to deliver electrical therapy to the heart.

The invention discloses soil engineering triaxial shear test equipment based on an MTS electro-hydraulic servo tester. The soil engineering triaxial shear test equipment comprises the MTS electro-hydraulic servo tester, wherein a soil engineering triaxial shear testing device is mounted on an MTS electro-hydraulic servo tester upper chuck and an MTS electro-hydraulic servo tester lower chuck of the MTS electro-hydraulic servo tester. The soil engineering triaxial shear test equipment has the following technical effects as follows: an accurate and stable force source is provided through sufficient utilization of the MTS electro-hydraulic servo tester, perpendicular pressurization on a sample is realized through an upper fixing rod and an axial drive rod, increasing and stabilizing of the confining pressure and the back pressure of the sample are realized through matching of a fed liquid of a liquid feeding port and a pressure volume controller, finally, back pressure saturation, isotropy and anisotropy of consolidation loading and unloading circulation, K0 solidification, creep solidification and dynamic and static triaxial shear test of the sample can be performed on the sample through close matching of components, the test process is controlled through software, the operation is simple and convenient, the automation degree is high, and the soil engineering triaxial shear test equipment is suitable for research, popularization and application; the equipment is simple and compact in structure, convenient to assemble, low in cost, high in measurement accuracy and good in stability and occupies small space.

A differential air pressure system has a pressure bag with windows and preferred folding configuration such that when the bag is folded no window is folded. The pressure bag is supported by a lift support that is proximal to a user control panel and adjacent to or nearly adjacent to the user who is coupled to the pressure bag. A treadmill base for use with differential air pressure equipment is provided. There are various improvements provided to adapt the operations of the DAP system via the use of separate pressure volume and non- pressure volume portions of the treadmill base. Various improvements to serviceability and repairs are provided by placement of components outside of the pressure volume portion or by providing one or more pressure volume access points.

This device is designed for a piston which is designed to move in alternating linear movement parallel to the axis of a chamber divided by the piston into a high pressure volume and a low pressure volume, and is of the type comprising:a circular cylindrical sliding surface bounding the chamber,an annular groove provided in the piston which is coaxial with the sliding surface and open towards the sliding surface, anda closed resilient sealing ring housed in a leak tight manner in the groove and intended to make sealing contact with the sliding surface.According to one aspect of the invention the ring is designed to determine the size of a lubricating oil film between the ring and the sliding surface to a limit lubricating thickness preferably from 0.1 μm to 1 μm when it moves from the high pressure volume to the low pressure volume.

A sub-atmospheric pressure desalinating still employs a closed top, open bottom pipe filled with source water to be distilled, such as seawater, having a height greater than the height of a column of seawater that can be supported by the pressure at the bottom of the tank so that a subatmospheric pressure volume is formed at the top. Water from the source is also pumped into the subatmospheric volume and passed through an evaporator which enlarges its surface volume. A small percentage of the water is vaporized and the balance is cooled to provide the heat of vaporization and falls into the top of the seawater column, creating a downward flow. The vapor is drawn from the vacuum and condensed, preferably in a second subatmospheric volume above a column of fresh water.

Uncontrolled take-up of a shade and often unexpected noise development are perceived as disturbing by the operator. Therefore, it is provided that a shade arrangement with a length of shade material (10) and a take-up roll (12) to which the length of shade material is attached and which is pretensioned by spring force in the take-up direction of the length of shade, has a pressure volume (46) coupled to the free end (16) of the length of shade material (10) such that, when the length of shade material is unrolled from the take-up shaft (12), a pressure is built up in the pressure volume which, when the length of shade material is released from a position in which it is at least partially unrolled from the take-up roll, the take-up motion of the length of shade is braked.

The invention discloses a lifting device gravitational potential energy pressure-volume storage system. According to the system, an electro-hydraulic compound energy recovery system is additionally arranged based on a lifting mechanism hydraulic cylinder inlet and outlet oil port system and is further composed of a hydraulic motor / pump, a motor / electric generator, a super-capacitor module and an energy accumulator. An inlet / outlet oil port of the hydraulic motor / pump communicates with a lifting hydraulic cylinder through a control valve, and the other oil port of the hydraulic motor / motor communicates with the energy accumulator. An output shaft of the hydraulic motor / pump is connected with an output shaft of the motor / electric generator. The super-capacitor module is connected to a rotary speed controller DC bus of the motor / electric generator. According to the lifting device gravitational potential energy pressure-volume storage system, the gravitational potential energy in the dropping process of the lifting mechanism is stored into the energy accumulator and a super-capacitor without throttling losses through the hydraulic motor / pump and the motor / electric generator, the part of energy stored can be recycled without throttling losses, machine working efficiency is improved, operating cost is reduced and emission pollution of an engine is reduced.

A method and system for an external combustion engine operable using at least two different fluids to provide pressure volume work to an engine. The engine is started by providing a compressed fluid at a sufficient pressure to move internal components of the engine that in turn rotate a shaft to generate power. At the same time the compressed fluid is provided to the engine, a liquid fluid is provided to a heater to be heated. The liquid fluid is heated to its boiling point and converted to gas form. Additional heat is provided to increase the pressure of this gas fluid. Once the pressure is increased to a sufficient level, the gas fluid is injected into the engine to generate power. The gas is exhausted from the engine, and is cooled and separated back into the two separate fluids. The initial compressed fluid is recompressed for later use.

A cone crusher comprising a frame (1), an outer blade (3) which is adapted to be locked to the frame, an inner blade (5) which is eccentrically and vertically movable relative to the outer blade, and the inner blade and the outer blade define there between a crushing chamber (4), a main shaft (7) which is stationary relative to the frame, an eccentric (9) which is bearing-mounted on the main shaft, a support cone (11) on which the inner blade is arranged, and an adjustment shaft (14) by means of which the support cone is vertically movable from below. A hollow space (13) is arranged inside the main shaft (7), the adjustment shaft (14) is arranged to the hollow space, a load cylinder (30) is arranged to a lower end (7') of the main shaft which load cylinder comprises an adjustment piston (33) acting to a lower end (27) of the adjustment shaft, a pressure medium supply is arranged to a pressure volume (39) under the adjustment piston for moving vertically the adjustment shaft, and a lubricant supply is arranged above the adjustment piston (33) for directing lubricant via the hollow space (13) to targets to be lubricated. A processing plant (400) comprising a cone crusher.

In a lithographic apparatus, a measurement of the position of an object in an ambient space by an object position measuring system which is influenced by pressure variations in the ambient space, is corrected by an accurate measurement of the pressure in the ambient space. A reference pressure volume may be provided, having a fluid connection with predetermined flow characteristics to the ambient space. A pressure difference is measured between a pressure in the reference pressure volume and an ambient pressure in the ambient space. The absolute pressure in the reference pressure volume is added to the pressure difference to determine a change of pressure in the ambient space. Alternatively, the pressure difference is integrated over time for determining a change of pressure in the reference pressure volume, and this change of pressure in the reference pressure volume is added to the pressure difference to determine a change of pressure in the ambient space. The fluid connection may also be a valve which can be opened and closed.

The invention provides a method and a device for simulating black oil reservoir. The method comprises the following steps of according to component fluid seepage parameters, establishing a component model for describing a black oil reservoir fluid seepage rule; according to the required data for simulating black oil based on the black oil model, performing numerical discretization on the component model, so as to obtain a component number model based on a discrete network of a black oil reservoir geological model; according to fluid PVT (pressure-volume-temperature) data, establishing a component phase balance parameter list; according to the component phase balance parameter list and the evaluation values of the component fluid seepage parameters, performing flash calculation, so as to obtain the fluid phase state and applicable physical parameter; according to the fluid phase state and applicable physical parameter, adjusting the component number model; according to the evaluation values of component fluid seepage parameters and the adjusted component number model, calculating, so as to obtain the oil reservoir pressure change value and the saturation change value of each fluid phase; judging whether the oil reservoir pressure change value and the saturation change value of each fluid phase are convergent or not; when the oil reservoir pressure change value and the saturation change value of each fluid phase are convergent, calculating, so as to obtain the oil reservoir pressure and the saturation of each fluid phase. The method has the advantage that the extendability of oil reservoir number simulation architecture is improved.

The invention discloses a continuation power flow algorithm considering field current constraint and armature current constraint of a power generator, which belongs to the technical field of electric power system stable analysis and control. Considering the influence of the field current constraint and the armature current constraint of the power generator on a reactive power output of the power generator, reactive output models under the maximal field current constrain and the maximal armature current constraint are respectively established, a Jacobian matrix is corrected in the continuation power flow calculation, power flow solution can be obtained through iteration, a pressure-volume (PV) curve is drawn, and more precise voltage stability margins can be obtained. In addition, the invention also provides a method for identifying a type of a static bifurcation point and key constraint conditions, so the type of the static bifurcation point and the key constraint condition causing the voltage failure can be identified, and the system prevention control validity can be improved.

The invention relates to a pressure switch used in over-pressure protection of family micro boiler steam generator, wherein it is formed by connector 1, sealing membrane 2, top rod 3, spring 4, frame 5, switch base 6, and micro switch 7; as picture 1, the connector 1 connects the pressure switch and the steam generator, as well as the mounting base of sealing membrane 2; the frame 5 mounts the membrane 2 and the top rod 3 inside the connector 1; the frame 5 mounts the switch base 6 after mounting the spring 4 and the pad 9, to form pressure sensor; the pressure volume is converted into the displacement of top rod 3, to push the trigger 10 of micro switch 7 mounted on the switch base 6; via adjusting the screw dept of switch base 6 in the frame 5, setting the operation point of pressure switch; then adhering the switch base 6 and the frame 5 with sealing rubber. Said invention uses rubber sealing membrane to replace the metal membrane, to realize lower cost and micro volume.