1191 results about "Pressure rise" patented technology

A system and method determine when fluid is not flowing properly from a secondary infusion source during a secondary infusion. The system includes an upstream pressure sensor and a processor programmed to receive signals from the sensor and analyze the signals to determine if secondary fluid flow is proper. The processor samples the output signals from the upstream pressure sensor and analyzes the sampled signals to determine if a pressure rise in the infusion line has occurred when the secondary infusion is initiated. If a pressure rise, indicating that fluid from the secondary container has begun flowing into the infusion line, has not been detected, the processor is programmed to provide a signal indicating that attention should be given to the infusion set up.

A method of operating a CPAP apparatus in which the interface pressure is controlled to rapidly drop at the start of expiration by an expiratory relief pressure (ERP) that is independent of instantaneous respiratory flow, following which the pressure rises to an inspiratory level at or shortly before the end of expiration, or at the onset of an expiratory pause, if any. The ERP is an increasing function of the inspiratory pressure. The expiratory pressure follows a template that is a function of the expected expiration time, the magnitude of the template being equal to the ERP. The current estimated proportion of expiration is determined by comparing the expiration time of the breath in progress to low-pass filtered expiratory durations measured for a number of the preceding breaths.

The apparatus for reduced-pressure refining of a glass melt includes a refining bank formed so that a reduced pressure is generated by a glass flow in it. The refining bank has a component, which is made from a refractory metal or refractory alloy acting as glass-contact material. The refractory metal or alloy contains molybdenum, tungsten, tantalum, and/or hafnium. The device of the present invention includes a protective gas reservoir for a protective gas and an automatically operating valve connecting the reservoir with the refining bank so that an inner side of the component that would otherwise be exposed when a pressure rise or a falling glass melt column occurs is protected from oxidation by the protective gas. A process for using the device during refining of the glass melt is also part of the invention.

There is provided a sealed secondary battery whose current-blocking system yields little change in the actuation pressure even on long-term use. The sealed secondary battery comprises a current-blocking system 80 that is actuated by a pressure rise inside a battery case 12 to disconnect conduction path between an electrode and an electrode terminal. Current-blocking system 80 comprises a pressure-sensitive member having a pressure-sensitive deformable portion 32 that deforms from a first state via snap-through deformation to a second state upon a pressure rise inside battery case 12, and is configured to disconnect the conduction path by snap-through deformation of pressure-sensitive deformable portion 30.

A method is disclosed for expanding the mid load operation limit in a four-stroke gasoline direct-injection controlled auto-ignition combustion engine. A system is employed for variably actuating the intake and exhaust valves and for operating the valves with an exhaust re-compression or exhaust re-breathing valve strategy. A spark plug is provided. A fuel injector having multiple injection capability is employed. A first fuel charge is injected into the combustion chamber to form a lean air-fuel mixture. A second fuel charge is injected into the combustion chamber to form a stratified air-fuel mixture having an ignitable mixture located near the spark plug. The ignitable mixture is ignited at the spark gap, thereby causing spark-ignition combustion that causes a sufficient increase in chamber pressure and temperature to trigger auto-ignition of the lean air-fuel mixture, resulting in the obtaining of a higher engine load before a pressure rise rate in the combustion chamber exceeds a prescribed threshold value.

A pilot operated pressure valve which limits the rate of start-up pressure rise ("soft start-up") and substantially eliminates excessive system pressure spikes. The valve includes an inlet, a hollow cylindrical main body sealingly connected at one end thereof to the inlet, a pilot chamber having a sleeve slidably mounted within the main body and an operating pressure adjustment connected to another end of the main body adjacent another end of the pilot chamber for varying the threshold operating pressure of the valve. A main chamber receives pressurized fluid metered through a main orifice and discharges pressurized fluid through a damping orifice when the main chamber is filled and fluid inlet pressure exceeds the inlet threshold pressure which is just sufficient to open a spring biased pilot ball downstream of the damping orifice. An exit port upstream of the main orifice will open for discharging pressurized fluid from the valve back to a supply tank when inlet pressure exceeds the maximum operating pressure setting of the valve. Pressurized fluid is also metered from the pilot chamber into a pressure compensated priority flow control valve arrangement including an adjust chamber to automatically vary the operating pressure of the valve in "soft start-up" fashion by selectively discharging pressurized fluid from the pilot chamber and/or the adjust chamber in modulated fashion when fluid pressure reaches the threshold operating pressure.

The invention relates to a two-stage expansion power generation device and method for recovering liquefied natural gas cold energy. LNG enters a first runner of a multi-stream cryogenic heat exchanger for vaporization and temperature rise after passing through an LNG pump for pressure rise; high-pressure working medium gas outputs electric power after entering a first-stage turbine expander for expansion, the working medium gas is divided into two parts, the first part enters a second runner of a plate-fin multi-stream cryogenic heat exchanger to absorb the LNG cold energy and become liquid through condensation, and then a pump is used for pressurization; the second part enters a second-stage turbine expander for expansion after passing through a second heat exchanger, enters a third runner of the plate-fin multi-stream cryogenic heat exchanger to become liquid through condensation, enters a fourth runner after being pressurized through the pump, converges with the first part of the working medium gas, conducts heat exchange with a refrigerant after the convergence, and then returns to an inlet of the first-stage turbine expander after conducting heat exchange with the environment and/or absorbing industrial waste heat to finish the circulation. Power output by the first-stage turbine expander and power output by the second-stage turbine expander are both used for generating the electric power. According to the two-stage expansion power generation device and method for recovering the liquefied natural gas cold energy, ethylene or ethane is used as the working medium, the LNG cold energy and the waste heat are recovered for power generation, and the two-stage expansion power generation device and method can be widely applied to power generation through utilization of the liquefied natural gas cold energy.

A cooler of working oil is prepared as forming said cooler by connecting multiple heat conduction tubes in parallel way to form heat radiation unit, setting formed cooler between inlet chamber at lead in port of working oil sent from oil pressure device and outlet chamber at send out port of working oil sent from oil pressure device, connecting buffer chamber with air storage unit through to inlet chamber for utilizing air in air storage unit to absorb pulsation and pressure rise of working oil at inlet chamber in order to cool working oil stably.

A fan system for a variable air volume heating and/or air conditioning unit comprising a fan array with a control system to eliminate surge at low operating flows and to maximize operating range. The fan control system includes a fan pressure sensor for determining the pressure rise across the fan array and a fan airflow sensor for determining the total airflow generated by the fan array. A surge controller is programmed to constantly monitor the calculated surge pressure as the fan speed control is modulating the fan speed in response to user demands. As airflow increases or decreases in response to changes in fan speed, so will the calculated surge pressure. The surge control turn fans on and off to ensure that the operating fans are running in their optimum fan speed ranges. Thus, the fans in the fan array are prevented from reaching the surge point.

A mass spectrometer of reduced size and weight is provided which is capable to conduct highly accurate mass spectroscopy. The mass spectrometer includes an ion source adapted to ionize gas flowing in from outside in order to ionize a measurement sample and a mass spectroscopy section for separating the ionized measurement sample. The ion source has its interior reduced in pressure by differential pumping from the mass spectroscopy section and ionizes the gas when the interior pressure rises as it inhales the gas, and the mass spectroscopy section separates the ionized measurement sample when its interior pressure falls after inhale of the gas. The mass spectrometer may further include a restriction device for suppressing a flow rate of the gas the ion source inhales and an open/close device for opening and closing a flow of the gas the ion source inhales.

The invention relates to a slow-expansion water-absorbable salt-resistant gel particle, and preparation and applications thereof. The gel particle relates to crosslinked gel having a net structure and formed by reactions of following raw materials: A), an acrylamide monomer, B) acrylic acid, C) a crosslinking agent, D) a salt-resistant crosslinking agent, E) an initiator that is persulfate, F) a reinforcing agent, G) a pH value conditioning agent, H) a foaming agent and I) water. The gel particle is a gel particle modifying and flooding agent having slow expansion performance, strong water absorption performance and salt resistance. The gel particle slowly absorbs water and expands when encountering water, and along with construction, the gel particle blocks, in the deep stratum, cracks or large pores and channels, thus adjusting water absorption profiles, diverting liquid streams, reducing inert areas in oil deposits, increasing production of oil of an oil well, and achieving a function of increasing the oil recovery rate of the oil deposits. The gel particle is low in expansion in construction processes, so that pressure rise is small, and the gel particle is suitable for profile control of a water injection well having low permeability and high water injection pressure.

The invention relates to an ultra-high pressure safety-valve test apparatus and a corresponding test method. The apparatus adopts a U-shaped bolt to fix the ultra-high pressure safety-valve on a work platform and the output flange of the ultra-high pressure safety-valve is arranged upward; an ultra-high pressure flange is connected with an ultra-high pressure tube and the ultra-high pressure safety-valve; an air-supply is compressed through an air bottle firstly by a compressor and secondly by an ultra-high pressure pump and then is charged into an accumulator; the purified water is injected into the valve cavity through the outlet flange of the ultra-high pressure safety-valve and the video monitor device is arranged well and the position is adjusted well; a safety shielding wall is adopted to separate the operation zone from the test apparatus zone; after all are ready, a back-up valve on a control table carries out the operations of pressure-rising and pressure-preserving step by step according to the set pressure percentage and sealing test pressure and the opening pressure and the sealing capability of the safety-valve are assessed according to the leakage rate of bubbles from the outlet. The ultra-high pressure safety-vale test apparatus is provided with simple structure, economical and practical capability, high operablity and sensitive and reliable testing performance and solves the actual problems in the ultra-high pressure safety-valve testing field of our country.