1417 results about "System pressure" patented technology

Pressure swing adsorption (PSA) separation of a gas mixture is performed in an apparatus with a plurality of adsorbent beds. The invention provides rotary multiport distributor valves to control the timing sequence of the PSA cycle steps between the beds, with flow controls cooperating with the rotary distributor valves to control the volume rates of gas flows to and from the adsorbent beds in blowdown, purge, equalization and repressurization steps.

A portable system for subatmospheric pressure therapy in connection with healing a surgical wound, includes a wound dressing dimensioned for positioning relative to a wound bed of a subject, a portable subatmospheric pressure mechanism dimensioned to be carried or worn by the subject and a container for collecting exudates from the wound bed removed under the subatmospheric pressure supplied by the subatmospheric pressure mechanism. The portable subatmospheric pressure mechanism includes a housing, a subatmospheric pressure source disposed within the housing and in fluid communication with the wound dressing to supply subatmospheric pressure to the wound dressing and a power source mounted to or within the housing for supplying power to actuate the subatmospheric pressure source.

Disclosed is a method for detecting a leak in a closed loop heat transfer system comprising monitoring the pressure of the heat transfer composition inside said heat transfer system, wherein a drop in pressure indicates a leak. Also disclosed is a heat transfer system comprising an evaporator, a compressor, a condenser, an expander and a device for measuring internal system pressure. The system pressure measuring device is disposed inside the closed loop heat system. The internal system pressure measuring means may be located either between the evaporator and the condenser, between the expander and the evaporator, between the compressor and the condenser, or between the condenser and the expander.

The invention relates to a coiled tubing supercritical CO2 jet fracturing method. The method is used for performing jet fracturing on oil well reservoirs by taking supercritical CO2 as fracturing fluid. By the method, a supercritical CO2 fluid is used as the fracturing fluid to perform the jet fracturing; a supercritical CO2 sand jet perforating hole can reduce system pressure; the pressure needed by fissure extension can be further reduced by the characteristics of low viscosity and high dispersion performance of the supercritical CO2 fluid; most importantly, the supercritical CO2 jet fracturing does not pollute the reservoirs, but the supercritical CO2 can further improve the oil and gas recovery ratio after entering the reservoirs; the return discharge is not needed after the fracturing is completed; when the stage-by-stage jet fracturing is performed by using the coiled tubing, a tube pillar can be lifted or put down without mineshaft pressure relieving, the operation process is reduced and the operation cost is reduced, so that the method is extremely suitable for fracturing modification of unconventional oil-gas reservoirs such as thick oil reservoirs, low permeability and super-low permeability oil-gas reservoirs, shale gas reservoirs, coal bed methane reservoirs and the like of which the effects are low by using the conventional water-based fracturing fluid.

Pressure measurement system, comprising a pressure detection device comprising a pressure sensor guidewire 5 provided with a pressure sensor connected to an electrical carrier for transmitting pressure data from the sensor to a processing means 1. The guidewire is adapted to be inserted into a vessel of a subject, and an image data capturing device for capturing image data representative of the vessel. The processing means 1 comprising a computer program product which comprises computer executable instructions for manipulating image data and pressure data to generate an output in which the pressure data is mapped onto a corresponding position on an image where that pressure data was detected to provide an integrated graphical image output on a monitoring means 2.

Pressure swing adsorption (PSA) separation of a gas mixture is performed in an apparatus with a plurality of adsorbent beds. The invention provides rotary multiport distributor valves to control the timing sequence of the PSA cycle steps between the beds, with flow controls cooperating with the rotary distributor valves to control the volume rates of gas flows to and from the adsorbent beds in blowdown, purge, equalization and repressurization steps.

The rated system pressure in a pressure control system is adjusted through a pressure relief valve (2). In addition to the pressure relief valve (2), the system includes a check valve (4), a pressure sensor (3), a position switch (10), a first pressure adjustment member (13) for the relief valve, a second pressure adjustment member (12) for the check valve (4), an actuator (16), and a microcontroller (15) with a memory (6) and a display (7). Faults caused by pressure adjustment interactions are prevented by permitting an adjustment of the pressure relief valve only if the check valve is fully open and a pump provides pressure. For this purpose the actuator (16) of the check valve in its normal position prevents an adjustment of the pressure relief valve. Opening the check valve by the actuator permits adjusting the pressure relief valve (2) and the switch (10) operated through the actuator sends a signal to the microcontroller to drive the pump. When the check valve is opened, the pressure is equalized throughout the system, so that adjusting the response pressure of the pressure relief valve automatically adjusts the system pressure to a desired rated pressure.

The invention relates to an experimental method and a device for simulating the process that microcosmic remaining oil is extracted in a microcosmic simulation model under the condition of oil deposit high temperature and high pressure, researching feasibility of microorganism oil displacement technology in improving enhanced oil recovery after water drive, and carrying out visualized microcosmic oil displacement experimental research under the high temperature and high pressure experimental conditions, in particular to a high temperature and high pressure visual device for simulating microorganism oil displacement and a simulating method thereof. The device comprises a model clamp clamping a microcosmic visual model, a displacement system, a back pressure system, an annular pressure system, a pressure monitoring system, a temperature control system and an image collecting system. According to the device, temperature and pressure can be controlled easily, used space is small, safety performance is excellent, operation is simple, action mechanism of microorganism and petroleum hydrocarbon and starting mechanism of the microorganism on the remaining oil can be conveniently observed in a visualized condition, and the device has important significance on wide application and popularization of microcosmic experiments in oil industries.

The invention discloses a pressure control method of an air conditioning system. The pressure control method comprises the following steps: S1, respectively comparing detected outdoor ambient temperature and exhaust pressure of a compressor with a preset temperature range and preset pressure, judging whether to reduce the exhaust pressure or not according to comparison results, and if so, starting the step S2; S2, reducing the rotational speed of an indoor fan during refrigeration and reducing the rotational speed of an outdoor fan during heating; S3, comparing detected degree of superheat of inhaled air or exhaust pressure with preset degree of superheat or preset exhaust pressure, judging whether to withdraw from the control of reducing the exhaust pressure or not according to the comparison results, and if so, starting the step S4; S4, stopping the reduction of the rotational speed of the indoor fan during refrigeration and stopping the reduction of the rotational speed of the outdoor fan during heating. Through the adoption of the pressure control method of the air conditioning system disclosed by the invention, the exhaust pressure of the system can be controlled within a certain range; furthermore, the method is low in cost and good in effects, and cannot impact the reliability of the air conditioning system.

Systems and methods are disclosed for monitoring at least two system parameters (such as system temperature or pressure, or system pressure at two different locations) of a hydrogen generation system and controlling hydrogen generation from a fuel solution. The system comprises a hydrogen generator having a fuel chamber for a liquid fuel, a reactor chamber where the fuel undergoes a reaction to produce hydrogen, and at least two sensors in communication with the reactor chamber, the sensors measuring at least two system parameters of the hydrogen generator. The methods include control sequences for controlling the fuel flow rate to the reactor based on the sensed parameters.

The invention relates to an air conditioner control technology and discloses an air conditioner waste heat blowing control method. Waste heat of a coiler of an indoor unit is blown out as quickly as possible after a compressor halts, so as to reduce the temperature of the coiler, and system pressure is in a balanced state to the greatest extent. The air conditioner waste heat blowing control method comprises the steps that: a fan of the indoor unit continuously operates to blow waste heat of the coiler of the indoor unit after the compressor stops in a heating state, and the temperature or waste heat blowing time of the coiler of the indoor unit is acquired and compared and judged with a preset threshold value, so as to realize corresponding regulation on the rotating speed of the fan of the indoor unit. The air conditioner waste heat blowing control method provided by the invention is applicable to waste heat blowing on indoor coilers of various air conditioners.

The present invention provides apparatus featuring a signal processor or processing module that may be configured at least to: process signaling containing information about an equilibrium point of pump differential pressure and system pressure formulated in a hydronic domain by utilizing pump and system characteristic curve equations so as to yield system pressure and flow rate at any particular load and time in a pump hydronic system, including using a multi-dimensional sensorless conversion technique; and determine equivalent hydronic system characteristics associated with the pump differential pressure and flow rate to their corresponding motor power and speed reconstructed and remapped by using a discrete numerical approach, based at least partly on the signaling received. The signal processor or processing module may provide corresponding signaling containing information about the system pumping flow rate and pressure determined.

The invention discloses an energy-saving shield segment assembling and positioning electro-hydraulic control system adopting a load-sensitive technology. The system comprises a motor, a variable pump, a two-position three-way proportional reversing valve, a variable cylinder, an overflow valve, a pressure reducing valve, a pressure compensating valve, a one-way valve, a multi-way valve, a balancing valve, a hydraulic lock, a hydraulic motor, a hydraulic cylinder, a moment rotation speed sensor, a displacement sensor and a pressure sensor. The multi-way valve with the pressure compensating valve in a segment assembling system is used for controlling the rotation speed of the hydraulic motor for driving the segment assembling machine to rotate and the moving speed of each hydraulic cylinder. The pressure sensor is used for detecting the pressure of a main oil passage of the system and the working pressure of each executer in real time; and a computer control unit is used for determining a variable pump control signal according to a system pressure signal, so that the displacement of the variable pump is changed with the load change so as to achieve load sensitive control. According to the invention, energy waste caused by continuous oil supply at the highest working pressure of the traditional system is avoided, the throttling loss and overflow loss are greatly reduced, and an obvious energy saving effect is obtained.

A method for testing a fluid supply system includes periodically preventing a fluid flow through the fluid supply system, and measuring a system pressure of the fluid flow subsequent to the step of preventing the fluid flow.

A method and system for operating a motor vehicle brake system, actuated in a “Brake-by-Wire” operating mode both by the vehicle driver and also independent of the vehicle driver, preferably operated in the “Brake-by-Wire” operating mode, and which can be operated in at least one fall-back operating mode, in which only operation by the vehicle driver is possible. The brake system has an electrohydraulic pressure and volume setting device, which electronically emits a brake system pressure under control, and a pressure modulation unit having, for each wheel brake, inlet and outlet valves for setting wheel-specific brake pressures. For setting wheel-specific brake pressures, the inlet and outlet valves are actuated analogously by being energized by different electrical currents, in order to assign a pressurizing agent volume flow provided by the pressure and volume setting device to the wheel brakes that have a pressure change requirement.

A pilot operated pressure valve which limits the rate of pressure rise and substantially eliminates excessive system pressure spikes, the valve including 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 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 a preselected inlet pressure level sufficient to open a spring biased pilot ball downstream of the damping orifice. The inlet will open an exit port upstream of the main orifice for discharging pressurized fluid from the valve back to a supply tank when inlet pressure exceeds the operating pressure. Pressurized fluid is also metered from the pilot chamber through a control orifice into a loading chamber to automatically further vary the operating pressure of the valve by including a relief valve for discharging pressurized fluid from said pilot chamber when fluid pressure exceeds the operating pressure.

A Coanda flow amplifier has a suction intake, an outlet, a fluid channel extending between the suction intake and the outlet, and a drive-flow inlet, which is fluidly connected to the fluid channel via a drive-flow discharge slit, whereby the flow cross section of the drive-flow discharge slit is variably adjustable. In a method to operate the Coanda flow amplifier, the variably adjustable flow cross section of the drive-flow discharge slit is chosen such that a pressure ratio between an output pressure of the drive flow when it leaves the drive-flow discharge slit, and an intake pressure of the drive flow when it enters the drive-flow discharge slit, does not exceed a critical pressure ratio. A fuel cell system comprises at least one fuel cell, a fluid source, a fluid line, and a Coanda flow amplifier arranged in the fluid line, whereby the Coanda flow amplifier is equipped with a drive-flow discharge slit with a variably adjustable flow cross section.

System (2) for carrying out a gas based thermodynamic cycle in which a gas is compressed in at least one compressor (8) in one part of the cycle and is expanded in at least one expander (10) operating simultaneously in an upstream or downstream part of the cycle, wherein the change in absolute internal power with gas mass flow rate differs as between the compressor and the expander and wherein the system comprises a control system configured to make selective adjustments so as individually to control, either directly or indirectly, the respective gas mass flow rates through each of the compressor and expander. The system may be an energy storage system including a pumped heat energy storage system configured to provide independent graduated control of system pressure and output power by selective adjustment of the respective gas mass flow rates through each half-engine.

Systems and methods for cooling a component within a housing adapted for subsurface disposal using a vortex tube. The housing contains a first pressure chamber; a vortex tube coupled to the first pressure chamber; a cooling chamber coupled to the vortex tube; and a second pressure chambercoupled to the cooling chamber; wherein the pressure chambers are adapted to stimulate a cool fluid flow from the vortex tube into the cooling chamber. A cooling method entails disposing the component to be cooled within the cooling chamber and adapting the system pressure chambers to stimulate a cool fluid flow from a vortex tube into the cooling chamber.

The invention provides a measuring method for an isothermal adsorption/desorption curve of coaly shale. The measuring method mainly comprises the following steps of: placing a coaly shale specimen into a true triaxial core clamping system; setting an initial measuring state of the specimen according to the actual stratigraphic condition; carrying out an adsorption/desorption experiment on the specimen after the volume of a free pore is calibrated; respectively measuring and recording a cumulative flow value of gas at an inlet end or outlet end and a balanced system pressure value according to a high-precise gas mass flow meter at the inlet end or outlet end and a system pressure sensor; calculating to obtain the volume of the absorbed gas; and then, drawing the isothermal adsorption/desorption curve of the coaly shale specimen. By using the measuring method, influences of a strain field, a temperature field and the like to the adsorption/desorption of gas on the surface of the coaly shale can be truly reflected, experiments carried out under the influence of single factor and experiments carried out under the coupled action of multiple factors can be achieved, and the measured adsorption/desorption curve can be used for truly representing the adsorption/desorption characteristic for gas in an actual coaly shale reservoir.

The invention discloses a solar seawater desalination device, which comprises a vacuum tube type solar heat collector with cold and hot water tanks, a combined evaporative condenser, a seawater evaporator, a vapor condenser, a scroll vacuum pump, a heat pump circulation system, a fresh water tank, a strong brine tank, a sieve plate, a pressure reducing valve and the like. The device adopts the scroll vacuum pump to obtain higher negative system pressure to reduce the evaporation temperature of seawater; between the seawater evaporator and the vapor condenser, the heating cycle of a heat pump is utilized to supply the latent heat released by vapor condensation to the seawater evaporator and provide the heat for the evaporation of the seawater, and the device fully and effectively recovers the latent heat of condensation of water vapor; and the combined evaporative condenser is adopted to ensure that the seawater can be immediately condensed after the evaporation of the seawater and reduce the load of the vacuum pump. The device has the advantages of high efficiency, low energy consumption, compact structure, high fresh water yield and the like, and is suitable to solve the water drinking problem in water-deficient areas and the water drinking problem of operating personnel on ships and offshore platforms all year round.

The invention relates to an oil charging accurate control method for a clutch in the gear shifting process of a wet double-clutch automatic transmission. The oil charging process of the clutch is divided into four stages. In the first stage, oil is rapidly charged into the clutch, the oil charging pressure satisfies the equation that P1=P0+delta P1, P0 is the target pressure, and the most appropriate delta P1 value under each oil temperature and gear shifting type is found out through an experiment mode by considering the influences of the oil temperature of a gear box and the gear shifting type. In the second stage, oil charging compensation is carried out on the clutch subjected to rapid oil charging, the oil charging pressure satisfies the equation that P2=P0+delta P2, and the most appropriate delta P2 value under each gear shifting type and system pressure is found out through an experiment mode by considering the influences of the gear shifting type and system pressure. In the third stage, oil charging waiting is carried out on the clutch, the oil charging pressure satisfies the equation that P3=P0, and the third stage is ended when the pressure of the clutch reaches 95% of the target pressure. In the fourth stage, oil charging is finished. By controlling the pressure of each stage, rapid and accurate response of the pressure of the oil charging process of the clutch can be realized, and impact caused by pressure overshoot of the clutch is avoided.

The invention discloses a platform leveling hydraulic system comprising a leveling cylinder, an arm-joint amplitude cylinder, a priority valve, a first flow control valve and a second flow control valve, wherein the first flow control valve is used for controlling the liquid feeding quantity of two cavities of the leveling cylinder; the second flow control valve is used for controlling the liquid feeding quantity of two cavities of the arm-joint amplitude cylinder; an oil inlet of the priority valve is communicated with a system pressure oil channel, a main oil port of the priority valve is communicated with an oil inlet of the first flow control valve, and a secondary oil port of the priority valve is communicated with an oil inlet of the second flow control valve; and a first control oil port for controlling the opening of the main oil port to change in an increasing trend is communicated with an oil outlet of the first flow control valve, and a second control oil port for controlling the opening of the secondary oil port to change in an increasing trend is communicated with the oil inlet of the first flow control valve. System pressure oil firstly satisfies the flow requirement of the leveling cylinder and can effectively avoid platform leveling advance or lag phenomena. On the basis, the invention also provides an elevated operation vehicle with the platform leveling hydraulic system.

The invention provides a method for controlling an amine solvent regeneration system, belongs to the technical field of amine solvent recovery, and comprises an amine recovery tower. The method is characterized in that a heat supply regulating valve of a tower bottom reboiler is related to system pressure; and a distilled line regulating valve of a tower top product is related to the gas-phase temperature of the tower top. The method can meet the requirement on purification degree of an amine solvent product on the tower bottom only by presetting a system pressure value and a tower top gas-phase temperature vale; and the control system can trace variations of feeding flow rate, feeding quality and feeding temperature to realize automatic regulation and obtain perfect tower bottom products.

A plasma torch system and method is provided, in which the system utilizes a number of pressure sensors throughout the system and the torch to detect the flow/pressure of shield and plasma gas during operation. The detected pressures are used by the system to dynamically control the system pressures to optimize the cutting operation.

A method and system for controlling a cooling fan that cooperates with an air conditioning condenser in a vehicle. The present embodiments include steps and corresponding implementations for determining a speed of the vehicle, determining a discharge pressure of the air conditioning condenser, determining an ambient temperature of air surrounding the vehicle and determining an outlet temperature of a vehicle air conditioning system. The cooling fan is operated in one or more desired fan speed modes corresponding to one or more respective discharge pressure ranges. The fan speed modes are a function of vehicle speed and one or more of ambient temperature, outlet temperature, and discharge pressure.

A method for operating a hydraulic system of an automatic transmission, in particular in a hybrid drivetrain, in which the hydraulic system comprises a main pump that is powered by an internal combustion engine and/or an electric drive motor, an electric auxiliary pump and a system pressure valve for setting a system pressure, to ensure various operating functions. In addition to the main pump, the electric auxiliary pump also supplies the hydraulic system with a volume flow of an operating medium. The loading of the electric auxiliary pump is determined in an electronic control unit with regard to the value of the system pressure and the loading of the electric auxiliary pump is limited, by the electronic control unit, with regard to the selected operating function.

A method, comprising: indicating leakage on a canister side of a fuel system based on a first fuel system pressure following applying a vacuum to the fuel system with a fuel tank isolation valve closed; and indicating leakage on a fuel tank side of the fuel system based on the first fuel system pressure and a second fuel system pressure following applying a vacuum to the fuel system with the fuel tank isolation valve open. In this way, an ELCM with a single reference orifice may be used to perform a leak test with two different thresholds for leak detection. This may allow vehicles currently in production to meet future emissions standards without costly upgrades to the ELCM.

The invention relates to a low-frequency disturbance and high-speed impact type high-pressure true triaxial test device and a low-frequency disturbance and high-speed impact type high-pressure true triaxial test method. The device comprises a dead load loading framework, a dynamic load loading framework, four dead load loading actuators, two dynamic load loading actuators and a split Hopkinson press bar mechanism, wherein all the actuators are connected with an oil source system; hollow ducts are formed in axial centers of piston shafts of the dynamic load loading actuators, dynamic pressure sensors in a hollow annular structure are mounted at the end parts of the piston shafts, and the split Hopkinson press bar mechanism respectively applies high-speed impact loads to a rock sample by virtue of the hollow ducts and the dynamic pressure sensors; the two dynamic load loading actuators adopts a static pressure oil path balancing-supporting sealing manner and are connected with the oil source system through servo valves, energy accumulators are assembled to oil paths, the flow is increased by virtue of the servo valves to drive dynamic response of pistons, and the system pressure during low-frequency disturbance loading is balanced by virtue of the energy accumulators. According to the device and the method, low-frequency disturbance loads and high-speed impact loads are freely applied to the same equipment for the first time.

Embodiments for monitoring fuel system degradation are provided. In one example, a method for a vehicle comprises evacuating fuel from a first fuel tank to a second fuel tank, and indicating fuel system degradation in response to a change in fuel system pressure following the evacuation of fuel. In this way, fuel system degradation may be indicated without use of a separate pressure building device.