116 results about "Pressure volume" patented technology

In an apparatus and method for examining the pulmonary mechanics of a respiratory system, in order to obtain information about the mechanical properties of the respiratory system's lungs, during an expiration of a flow of gas streaming out of the respiratory system is modulated, the volume of gas streaming out of the respiratory system is determined, the variation in pressure in the respiratory system is determined, and an expiratory pressure-volume relationship is determined from the expiratory volume and the expiratory variation in pressure.

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 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.

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.

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.

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.

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.