467 results about "Pressure decrease" patented technology

Embodiments of the present invention are related to a pumping system that accurately dispenses fluid using a multiple stage (“multi-stage”) pump. More particularly, embodiments of the present invention provide for control of a feed stage pump to regulate fluid pressure at a downstream dispense stage pump. According to one embodiment of the present invention, a pressure sensor at the dispense stage pump determines the pressure in a dispense chamber. When the pressure reaches a predefined threshold, the dispense stage pump can begin to increase the available volume of the dispense chamber, thereby causing the pressure in the dispense chamber to drop. As the pressure decreases/increases at the downstream pump, the pressure applied by the upstream pump can bed increased/decreased.

A pressure and temperature core sampler comprises a tool for recovering cores specifically enabling the evaluation of methane hydrate resources. Because methane hydrate tends to decompose under conditions of pressure decrease and/or temperature increase as the samples are retrieved to the surfaces a coring tool in accordance with the present invention provides a self-contained system for retrieving core samples at or near in situ pressure while cooling the core sample. The coring tool is preferably a wire line retrievable device that provides for nearly continuous coring during the drilling operation.

A method and apparatus for use in the oil well industry for running in drilling/production liners and sub-sea casings down a borehole through drilling fluid on a drill pipe using a multifunction diverter tool with the benefits of surge pressure reduction are disclosed. In accordance with the present invention, a multi-function diverter tool includes a housing assembly with a set of flow holes formed therein and a sliding sleeve arranged within the housing assembly having two sets of flow ports formed therein at different axial locations along the sleeve. By aligning either set of flow ports of the sleeve with the flow holes of the housing, the tool is set in a "surge pressure reduction" mode. By shifting, or axially indexing, the sleeve downward, the set of flow holes becomes blocked by the sleeve thus setting the tool in a "circulation" or "cementing" mode. This shifting or indexing is accomplished using an indexing mechanism. The multi-function diverter tool of the present invention can be shifted from a first "surge pressure reduction" mode to a "circulation mode," from the "circulation mode" to a second "surge pressure reduction" mode, and finally from the second "surge pressure reduction" mode to a "cementing" mode. The indexing mechanism of the present invention includes a return spring and brake system which provides the tool with more reliable shifting functionality.

The invention provides an intelligent pressure cooker and a using method thereof, and relates to the technical field of electric appliances in life. When a main loop is connected, a heating unit heatsa pressure cooker cavity; during heating, a collecting component collects cooking parameters in the cavity in real time, and the cooking parameters are sent to a control center; the control center stores cooking modes of the intelligent pressure cooker in advance and cooking threshold values corresponding to the cooking modes, wherein the cooking modes comprise the constant-pressure control mode,the temperature-constant control mode and the normal mode; under different cooking modes, the control center controls a pressure decrease control unit or the heating unit according to the received cooking parameters, temperature-constant pressure-constant control adjustment is realized for the pressure cooker, pressure and temperature in a cooker body are monitored easily in real time in the process of cooking, it is avoided that a common pressure cooker is monotonous and random in working pressure and temperature, accordingly, food heating speed is increased, food heating quality is improved, and using experience of a user is improved.

A method for adjusting delivery of a therapeutic fluid to a patient suffering from or at risk of pulmonary arterial hypertension includes introducing the therapeutic fluid to a patient via a catheter at a predetermined rate. The catheter is positioned to deliver the fluid to the right ventricle or the pulmonary artery. The catheter a one-way valve configured to allow the fluid to flow from the catheter to the target location. The method further includes monitoring pressure of the target location by monitoring internal catheter pressure, and adjusting the rate at which the therapeutic fluid is introduced to the catheter based on the monitored pressure. The rate at which the fluid is introduced to the catheter is increased if internal catheter pressure increases, and the rate at which the fluid is introduced to the catheter is decreased if the internal catheter pressure decreases.

A method for determining existence of a borehole fluid control event by controlling formation pressure during the drilling of a borehole includes selectively pumping a drilling fluid through a drill string extended into a borehole, out a drill bit at the bottom end of the drill string, and into an annular space between drill string and the borehole. The drilling fluid leaves the annular space proximate the surface. Existence of a well control event is determined when at least one of the following events occurs: the rate of the selective pumping remains substantially constant and the annular space pressure increases, and the rate of the selective pumping remains substantially constant and the annular space pressure decreases.

An apparatus (1) for non-invasive mechanical ventilation comprises a fan (2) of Bi-level type, or BiPAP, for generating an air flow according to a succession of inspiration steps, or IPAP, and exhalation steps, or EPAP. The flow is conveyed in the aerial ducts of a patient (25) by means of a flexible tube (3) connected to a nasal mask (4). A flexible air reservoir (5) is provided pneumatically connected to the duct (3) and the nasal mask (4) in order to subtract from the inspiration flow a certain air amount before that it reaches the patient (25) at the beginning of an IPAP step. During the exhalation EPAP step, since the air flow pressure decreases automatically, there is the emptying at least partial of the flexible air reservoir (5), whereas the air exhaled by the patient exits through an opening (14) made on the nasal mask (4). This way an air exchange occurs also in the most peripheral patient's aerial ducts and the amount of gaseous exchanges is increased, reducing at the same time the duration of the treatment.

This invention discloses a method for preparing multi-level porous beta-zeolite. The method comprises: soaking monolithic silica gel column in sucrose solution, drying, polymerizing, carbonizing to obtain C-Si composite, wetting the C-Si composite with a mixed solution of Al source, inorganic alkali, organic amine and water, crystallizing, and recovering the product. In this method, carbon material can effectively protect the porous structure of monolithic silica gel column from damage during crystallization process. The obtained beta-zeolite has multi-level pores, including micrometer-scale macropores, mesopores and micropores. The macropores can shorten the diffusion distances of reactive molecules, reduce the pressure decrease of the equipment, raise the unit processing capacity of the equipment, and make the adjustment and control of the product selectivity easier. The mesopores can provide large inner specific surface area, which is meaningful to the catalytic reaction of macromolecules.

This invention discloses a process for converting CO in pulverized coal gasification. The process comprises: introducing crude synthesis gas from pulverized coal gasification into a gas-liquid separator, mixing the gas from separator top with outside middle-pressure overheated steam, middle-pressure steam and a small amount of condensate from steam stripping, introducing into a pre-conversion furnace, controlling the temperature increase, introducing the converted gas into 1# conversion furnace, performing in-depth CO conversion, introducing high-temperature shift gas into a middle-pressure waste boiler to generate4.0 MPa steam with the condensate produced in the process, introducing all middle-pressure steam into fresh converted gas for recycling, quenching with the condensate for humidification, converting in 2# conversion furnace, cooling he converted gas by a water preheater, introducing into 3# conversion furnace, recovering waste heat until the output gas is less than or equal to 40 deg.C, and introducing into the following procedures. The CO concentration is decreased from 60-65 mol. % to less than or equal to 0.4 mol. %. The pre-conversion furnace can prevent catalyst poisoning. The pressure decrease of the conversion system is reduced, thus can ensure the pressure at the inlet of the synthesis gas compressor.

A fuel injection detecting device computes a maximum-fuel-injection-rate-reach timing and a fuel-injection-rate-decrease-start timing based on a falling waveform of the fuel pressure and a rising waveform of the fuel pressure. The falling waveform represents the fuel pressure detected by a fuel sensor during a period in which the fuel pressure increases due to a fuel injection rate decrease. The rising waveform represents the fuel pressure detected by the fuel sensor during a period in which the fuel pressure decreases due to a fuel injection rate increase. The rising waveform and the falling waveform are respectively modeled by modeling function. In a case of small fuel injection quantity, an intersection timing at which lines expressed by the modeling functions intersect with each other is defined as the maximum-fuel-injection-rate-reach timing and the fuel-injection-rate-decrease-start timing.

A transmission control arrangement controls the generation of a required solenoid control current that is provided to an electro-hydraulic pressure control module to ultimately control clutch pressure. The module includes a linear solenoid, which has an up direction pressure-current (P-I) data table and a down direction pressure-current (P-I) data table associated therewith. For large pressure increase change requests the up P-I table is used. For large pressure decrease change requests the down P-I table is used. An interpolation process uses current values taken from both the up and down P-I data tables for pressure change requests that are neither large increases nor large decreases. The control arrangement also includes a variable gain feature that changes the gain in dependence on the gear state of the transmission.

The first control is to displace the primary piston by the amount obtained by multiplying the input rod displacement quantity by a proportional gain. The second control is to propel the primary piston by a prescribed offset thereby executing the first control. The third control is to displace the primary piston by the amount obtained by multiplying the input rod displacement quantity by a proportional gain specifically at a pressure decrease request. The brake force control device properly selects a control method from the first to third control methods to control the primary piston based on the automatic braking release conditions and a driver's brake request when a driver executes a brake operation during the automatic braking.

A wind turbine comprises a tubular casing having an inlet opening, an outlet opening, an outer surface generating a pressure decrease, an inner surface presenting a convergent section joined to the inlet opening, a divergent section joined to the outlet opening and to the convergent section by a throat, and a propeller mounted rotating with respect to the tubular casing in proximity to the throat. It is coupled to a first generating machine. It comprises another propeller mounted rotating with respect to the tubular casing, placed upstream from the first propeller in the convergent section.

The invention relates to a trickle downward film type evaporator device and a using method thereof; the downward film type evaporator of the prior art which is the two-phase refrigerant distributor technology has a five-layer orifice plate structure and a capillary structure, as the structure is more complicated and the processing and assembling difficulty is high, the uneven liquid distribution is easily caused, the heat transfer performance is decreased and the energy efficiency is lowered. The trickle downward film type evaporator device adopts the technical proposal of a multi-directional two-grade pressure decrease distribution device, a two-phase refrigerant distributor which consists of a trapezoidal shell body, a multi-directional flow distribution plate, a grade-one distribution orifice plate, a grade-two distribution orifice plate, a gas absorption distribution plate and an end seal plate is used for carrying out the multi-directional two-grade pressure decrease distribution, thereby leading a gas-liquid refrigerant to be evenly and effectively trickled at the outer surface of the pipe wall of an evaporation pipe bundle and further carry out the full heat exchange. The trickle downward film type evaporator device has the advantages that: the two-phase refrigerant distributor technology has simple structure, easy production, even liquid distribution of the gas-liquid refrigerant and improved heat transfer performance. Compared with the existing flooded evaporator, the energy is saved by 15-20 percent, and the filling amount of the refrigerant is reduced by 20-30 percent, thereby being economic and energy-saving.

A method and system for locally sealing a vacuum microcavity, methods and systems for monitoring and controlling pressure in the microcavity and method and system for trimming resonant frequency of a microstructure in the microcavity are provided. The microcavity has an initial base pressure therein after the microcavity is locally sealed at an access passageway. The monitoring and control methods include measuring pressure in the microcavity and providing a signal when the pressure exceeds a maximum desired level. The control method also includes reducing the pressure in the microcavity to a pressure at or below the maximum desired level in response to the signal to compensate for vacuum degradation within the vacuum microcavity.

A method for controlling fuel injection of a direct injection fuel system, the fuel system having a fuel pump, the method comprising: variably operating the fuel pump to maintain a fuel pressure at a selected pressure, temporarily increasing pump operation to increase pressure sufficiently above said selected pressure and then reducing pump operation; during at least a fuel injection subsequent to the reduction in pump operation, correlating pressure decrease to injector operation, and adjusting fuel injection operation based on the correlation.

A method for combusting fuel in an engine involving decreasing a first volume of gas to a second volume, in two stages, while increasing the pressure and temperature of that volume of gas (a compression process having a chosen compression ratio), then increasing the second volume to a third volume at constant pressure while adding heat until a predetermined temperature is obtained, increasing the third volume of gas to a fourth volume, in two stages while decreasing the pressure at the predetermined temperature (an expansion process having a chosen expansion ratio much greater than the compression ratio), decreasing the pressure to atmospheric pressure while removing heat under constant volume, and finally decreasing the volume of gas to the first volume while removing heat under constant pressure to complete an over expanded, limited-temperature cycle. Also disclosed is an engine employing said over expanded, limited-temperature cycle.

The invention discloses an individual adaptive pressure increasing and decreasing control method for an electronic sphygmomanometer. The method includes: continuously inflating a cuff sleeved on an upper arm for pressure increasing; detecting pulse wave signals and cuff pressure signals; calculating mean pressure Pv and heart rate S according to the pulse wave signals during pressure increasing, calculating systolic pressure Ps according to the mean pressure Pv, and setting the maximum valve Pm of cuff pressure increasing; when the pressure of the cuff reaches the maximum value Pm, by a control air valve, performing individual adaptive constant-speed pressure decreasing until pressure decreasing is completed and the control air valve is completely opened to empty air. By the individual adaptive pressure increasing and decreasing control method for the electronic sphygmomanometer and the electronic sphygmomanometer, high-quality pulse wave signals with moderate pulse waves, reasonable amplitude and evident envelop features, a premise is provided for further identification and determining of blood pressure parameters, and comfortableness of a to-be-tested person is improved during the whole test. In addition, the method is high in individual adaptive measuring capability.

A swimming pool designed for stationary swimming uses Venturi-based eductor jets to generate a forceful water flow augmented by entrained pool water drawn from within the pool enclosure. The eductor jets use the kinetic energy of the inlet flow to entrain the low-pressure pool water, completely mix the two, and then discharge the mixture as an augmented outlet flow. The energy from the motive inlet flow is transferred to the entrained pool water via the Venturi effect. As the motive inlet water passes through a tapered nozzle in the eductor jet, kinetic energy increases and pressure decreases. This produces a Venturi effect which draws surrounding pool water into the Venturi orifice of the eductor jet. Consequently, the volume of the outlet flow from the eductor jets is 3 to 5 times the volume of the inlet flow. A larger and more powerful stream of water is thereby discharged into the pool enclosure and provides optimal resistance for in-place swimming in an energy-efficient manner.

The present invention provides a pulsation pressure decreased type pump. When an oil pump that is driven by a motor during the operation of an electronically controlled brake system discharges a working fluid, the working fluid passes through an annular orifice provided at a position where the working fluid is discharged and is then discharged to an outlet of a pump housing through an outflow channel formed in the orifice so as to decrease a pulsating pressure using a piston reciprocated by a cam. Therefore, it is possible to decrease a pulsating pressure generated in the pump from 20 bar to 5 bar or less.