74 results about "Flow pulse" patented technology

A fuel cell system includes a fuel cell stack and a flow control device that controls a supply of a first phase fluid flowing through the fuel cell stack. A controller monitors at least one parameter of the fuel cell stack and controls the supply to generate pulses of reactant when the at least one parameter crosses a threshold to flush a second phase fluid from said fuel cell stack.

A downhole flow pulsing device comprises a housing connected in series with a drill string and a valve with a rotating portion in the housing arranged to vary an area of a flow passage through the housing. A fluid actuated positive displacement motor drives rotation of the valve. A drive link permits the rotating portion of the valve to be optionally coupled directly to the motor of the drill string. The valve includes radially oriented rotating ports intermittently communicating with surrounding fixed ports and a bypass channel. Axial displacement of the rotating ports relative to the fixed ports and bypass channel permits amplitude of the downstream fluid pulses to be adjusted. The valve includes a number of circumferentially spaced ports which differs from a prescribed number of pressure fluctuations in the fluid for each full rotation of the rotor of the drill motor.

A downhole flow pulsing device comprises a housing connected in series with a drill string and a valve with a rotating portion in the housing arranged to vary an area of a flow passage through the housing. A fluid actuated positive displacement motor drives rotation of the valve. A drive link permits the rotating portion of the valve to be optionally coupled directly to the motor of the drill string. The valve includes radially oriented rotating ports intermittently communicating with surrounding fixed ports and a bypass channel. Axial displacement of the rotating ports relative to the fixed ports and bypass channel permits amplitude of the downstream fluid pulses to be adjusted. The valve includes a number of circumferentially spaced ports which differs from a prescribed number of pressure fluctuations in the fluid for each full rotation of the rotor of the drill motor.

Devices are provided for regulating the pressure pulses and flow pulses that are emitted in the exhausts of apparatus and equipment such as internal combustion engines, compressors and poppet valves. The pressure pulses are reflected from a reflecting member to their source as expansion waves that create a reduced pressure zone that allows subsequently emitted flow pulses to be more easily emitted, thereby enhancing the operational efficiency of the apparatus and equipment. Flow pulses that contain exhaust products such as the products of combustion from an internal combustion engine are regulated so that the exhaust flow they generate is not unduly restricted within the device and an undesirable back pressure that resists the emission of flow pulses from their source created. In regulating the pressure and flow pulses, the devices attenuate the noise generated by the pressure and flow pulses.

A pneumatically-operated gas delivery device coupled in interruptible fluid communication between a recipient and at least one course of pressurized respiratory gas controls delivery of the respiratory gas to the recipient as the recipient inhales and exhales. The device includes a regulator mechanism, a supply valve and a sensing valve, wherein the supply valve delivers the respiratory gas to the recipient responsive to movement of the sensing valve. Gas flow to the supply valve is communicated from the gas source, the regulator mechanism and through a plurality of bolus chambers each of which chambers communicates a portion of the recipient's demand gas flow rate from the regulator mechanism to the supply valve. The bolus chambers allow a high-flow pulse of respiratory gas to be delivered to the patient upon initiation of inhalation coupled with steady state flow for the remainder of inhalation. Distribution of the recipient's gas flow rate among the several bolus chambers improves the dynamic performance of the device.

The invention discloses a method for realizing opening control of an EGR (Exhaust Gas Recirculation) valve, a device and a system, which are used for lowering the cost and increasing the accuracy in the opening control of the EGR valve. The method comprises the following steps: acquiring the difference value between the discharge pressure of an engine and the intake pressure of the engine; searching for an EGR flow pulse spectrogram according to the difference value between the discharge pressure of the engine and the intake pressure of the engine and the current opening value of the EGR valve to obtain the current practical EGR flow; acquiring the total air inflow under a current working condition; dividing the current practical EGR flow by the total air inflow under the current working condition to obtain the current practical EGR rate; comparing the current practical EGR rate with an EGR rate set value under the current working condition, adjusting the opening value of the EGR valve through proportional-integral-differential (PID) control, and updating current opening value of the EGR valve.

A brewing apparatus includes an intermittent brewing feature whereby a controller regulates flow into a brew basket based upon a user selected pre-stored flow profile comprising a sequence of flow pulses. A user selects from among a plurality of stored intermittent flow profiles according to the specific brewing operation, where each profile is designed for different brewing conditions. The flow profiles can be incorporated into a larger set of pre-stored or programmed instructions that also regulate temperature, volume, warming operations, and the like.

A pulsing valve assembly pulses metered fuel flow to a turbine engine. The pulsing valve assembly comprises a valve housing having an inlet and an outlet. A divider valve divides metered fuel flow into a first flow portion and a second flow portion. A first actuator sets a magnitude of a flow divide between the first and second flow portions. The valve assembly also includes a pulsing valve for pulsing the first flow portion and a second actuator for setting a frequency of pulsing valve. The pulsed and unpulsed flow portions are then joined and delivered to the turbine engine combustion chamber.

An underground drilling method and apparatus generates intense pressure pulses at a location at the surface. The pressure pulses propagate down through a drill string to a drill bit. The pulses may be generated by creating water hammer in flowing drilling mud. Intensity of the acoustic pulses is increased in the bit nozzles. Vigorous pulsing of the fluid exiting the bit nozzles results in better cleaning of the hole bottom and faster drilling. The pulses may be used to drive the operation of various down hole tools. One type of tool has multiple pistons arranged in series. High pressure pulses move the pistons to generate strong mechanical vibration in the drill string. Vibration of the drill string may also reduce the friction between the drill string and the hole, resulting in lower torque requirements.

An underground drilling method and apparatus generates intense pressure pulses at a location at the surface. The pressure pulses propagate down through a drill string to a drill bit. The pulses may be generated by creating water hammer in flowing drilling mud. Intensity of the acoustic pulses is increased in the bit nozzles. Vigorous pulsing of the fluid exiting the bit nozzles results in better cleaning of the hole bottom and faster drilling. The pulses may be used to drive the operation of various down hole tools. One type of tool has multiple pistons arranged in series. High pressure pulses move the pistons to generate strong mechanical vibration in the drill string. Vibration of the drill string may also reduce the friction between the drill string and the hole, resulting in lower torque requirements.

The invention discloses a hydraulic pipeline fluid pulse active inhibition method based on a bilateral overflow principle. The method utilizes a piezoelectric ceramic direct drive type four-way slide valve as an executive component of fluid pulse active control, A and B ports of the slide valve are connected to same side branch of a hydraulic pipeline, and P and T ports of the slide valve are connected with an oil box; and a sine control signal drives the slide valve to finish a periodic motion process, the A and B ports realize twice overflowing through the P and T ports, namely bilateral overflowing, and the generated overflowing flow can completely counteract source pulse flow, thereby realizing the active inhibition of hydraulic pipeline fluid pulse. The active inhibition method provided by the invention has the advantages that (1) the motion frequency of the slide valve is one half of the flow pulse frequency of a hydraulic system to be eliminated; and (2) maximal overflowing flow can achieve the flow of the slide valve when a piezoelectric ceramics actuator is in maximum elongation quantity. The invention provides the fluid pulse active inhibition method for the hydraulic system which has the advantages of high speed, high pressure and high power density, and the fluid pulse active inhibition method is further easily practical.

The invention discloses a volume correcting instrument indication error calibration standard device and a using method. The volume correcting instrument indication error calibration standard device includes an intelligent flow meter, a thermostat and a temperature standard device, a pressure standard device, a standard frequency generator and a computer, wherein a temperature sensor and a fan are mounted in the thermostat, a blind plate with a temperature testing hole and a blind plate with a pressure testing hole are arranged on a thermostat bottom support, and a flow basic meter is connected between the two blind plates; the temperature sensor and the pressure sensor as well as the temperature standard device and the pressure standard device of the volume correcting instrument are under the temperature and pressure of the same medium in the flow basic meter; and the volume correcting instrument is connected with the standard frequency generator through a conducting wire. If the gas components and pulse equivalent are provided, and under the condition that the temperature and pressure are set, the working condition flow pulse signal is input into the volume correcting instrument to obtain the display value of the accumulated flow rate under the standard condition, and then the indication error is obtained by comparing with the theoretical value under the same working condition according to the international algorithm through the computer. The volume correcting instrument indication error calibration standard device and the using method enable the calibration to be easy to carry out, and reduce the uncertainty of the calibration results.

A brewing apparatus includes an intermittent brewing feature whereby a controller regulates flow into a brew basket based upon a user selected pre-stored flow profile comprising a sequence of flow pulses. A user selects from among a plurality of stored intermittent flow profiles according to the specific brewing operation, where each profile is designed for different brewing conditions. The flow profiles can be incorporated into a larger set of pre-stored or programmed instructions that also regulate temperature, volume, warming operations, and the like.

The invention discloses a method for realizing the nanominiaturization of a metal material surface crystal grain, which comprises the following steps of: (1) cold-rolling a metal matrix, polishing the surface till the roughness is 0.06-0.08 mum and cleaning; and (2) putting the metal matrix treated in the step (1) into a strong flow pulse electronic beam device, vacuum-pumping to 10-3-10-4 Pa, bombarding the surface of the metal matrix by adopting a pulse electronic beam with an energy density of 2-4 J / cm<2> and controlling the pulse duration at each time within 0.5-1 microsecond, the bombardment number within 2-30 and the pulse time interval at each time within about 5-20 seconds. The method has the beneficial effect that by utilizing the characteristic that the surface of a deformable material is quickly tempered by the pulse electronic beam, the metal surface crystal grain is refined, so that the size of the surface crystal grain is reduced to 100-500 nanometers, thereby the excellent surface performance is obtained.

A magnetic resonance imaging apparatus comprises an RF coil unit which generates RF pulses toward a subject, and which receives an MR signal from the subject, gradient magnetic field coils which generate a gradient magnetic field for slice selection, a gradient magnetic field for phase encoding and a gradient magnetic field for frequency encoding, an arithmetic unit which generates image data on the basis of the MR signal, and a sequence controller which controls the second gradient magnetic field coils in order to generate flow pulses for dephasing or rephasing a spin of a blood flow within the subject, in the same direction as that of the phase encoding gradient magnetic field.

Disclosed is a multifunctional instrument for measuring fuel consumption of diesel engine. Fuel oil enters a main unit from a daily oil cabinet through a first flowmeter; part of the fuel oil entering the main unit returns, as return oil, into an oil incoming pipe of the main unit; another part of the fuel oil is injected into a cylinder of the main unit and burns; the rest becomes leaking oil, leaking to a leaking cabinet through an umbrella unit of a booster pump; a measurement loop of the fuel oil passing through the flowmeters is formed; an FCM10A oil consumption meter receives measurement flow pulse signals of the flowmeters and also receives electrical signals, including power, speed and torque, transmitted by a dynamometer; the flow pulse signals and the electrical signals are transmitted to a computer; the computer calculates the signals in real time through FCM10A software and displays changes in diesel engine fuel consumption and fuel consumption rate in the whole measuring phase; finally, an average fuel consumption rate of the diesel engine in the measurement time is output. The instrument has the advantages that testing of various functions can be implemented, output data is comprehensive, secondary processing is not required, testing is accurate, operations are convenient, and hardware is easy to purchase.

The invention relates to an equal flow pulse jet drilling bit device and a design method thereof. A plurality of bit ports are distributed in the bottom wall of a drilling bit water cavity at the upper end of a drilling bit body. All the bit ports are respectively extended downwards, and respectively communicated with spray orifices in the lower end face of the drilling bit body. A static valve disc is installed on the bottom wall of the drilling bit water cavity. The static valve disc is provided with static valve disc water holes. The hole diameter of all the static valve disc water holes is as same as that of all the bit ports. All the static valve disc water holes respectively run through the bit ports in one-to-one correspondence mode. A movable valve disc covers above the static valve disc. The movable valve disc is provided with movable valve disc water holes. When the movable valve disc rotates, the open area of the movable valve disc water holes and the static valve disc water holes along the axial direction is constant value. The static valve disc water holes are round holes. The movable valve disc water holes are annular sector holes. The radial distance of the annular sector holes is as same as the hole diameter of the static valve disc water holes. The center of a center circle of the annular sector holes and the circle center of the static valve disc water holes are located on the same circumference. The equal flow pulse jet drilling bit device can improve bottom hole cleaning effects and hydraulic drilling ability, and can guarantee stable running status of a high pressure pump.

The application relates to an electrically driven multilateral overflow pulse attenuation control system and a multilateral overflow system. The control system comprises a pressure sensor, a controller, an executing mechanism and a multilateral overflow valve; the controller is used for generating a control command controlling the executing mechanism based on a fluid pressure signal collected by the pressure sensor; the multilateral overflow valve comprises a valve core and a valve core sleeve; the valve core is provided with m through holes to form bypass overflow inlets; the valve core sleeve is provided with n through holes to form bypass overflow outlets; the valve core and the valve core sleeve are coaxially arranged; the valve core rotates around a rotary shaft to conduct at least one bypass overflow inlet with at least one bypass overflow outlet to form an overflow passage; the executing mechanism is used for driving the valve core to rotate around the rotary shaft and / or reciprocate along a direction of the rotary shaft. According to a solution of the present application, the valve core is controlled to move to enable the overflow inlet and the overflow outlet to be matched to form the overflow passage, and flow pulse generated in a main pipeline can be at least partially offset.

A magnetic resonance imaging apparatus includes an RF coil unit which generates RF pulses toward a subject, and which receives an MR signal from the subject. Gradient magnetic field coils generate a gradient magnetic field for slice selection, a gradient magnetic field for phase encoding and a gradient magnetic field for frequency encoding, respectively. An arithmetic unit generates image data on the basis of the MR signal, and a sequence controller controls phase encoding gradient magnetic field coils in order to generate flow pulses for dephasing or rephasing the MR spin of blood flow within the subject, in the same direction as that of the phase encoding gradient magnetic field.

The invention provides a cooling fluid containing solid hollow particles. Solid hollow particles disperse in a liquid state fluid to form the cooling fluid; and the solid hollow particles have an overall density 80-120% of that of the liquid state fluid. The cooling fluid provided by the invention has the following advantages: on the one hand, the particles cladded by a material with high thermal conductivity can reinforce thermal conductivity of the cooling liquid; on the other hand, the solid hollow particles promote generation of turbulent flow pulses during a flow process, thereby further reinforcing convective heat transfer of liquid. As the particles cladded by multiple layers are in the hollow structure and have overall density consistent with that of a solvent, the particles hardly generate settlement or aggregation during the flow process. Therefore, the cooling fluid can guarantee stable and safe operation of a heat radiation system.

The invention discloses a method and device for detecting an LDoS attack targeting an Internet autonomous domain. The method for detecting the LDoS attack targeting the Internet autonomous domain comprises steps of obtaining flow pulse characteristic data and a network state corresponding to the flow pulse characteristic from history flow data of the Internet autonomous domain, establishing an LDoS attack classified model with an unknown parameter according to a conditional random field algorithm, calculating the unknown parameter in the LDoS attack classified model according to the obtained flow pulse characteristic data and the network state corresponding to the flow pulse characteristic, and calculating a network state corresponding to the flow pulse characteristic data which is collected in real time according to the LDoS attach classified model, the unknown parameter of which is calculated. The method and device for detecting an LDoS attack targeting the Internet autonomous domain can effectively and accurately detect the LDoS attack targeting the Internet autonomous domain without changing a communication protocol.

A method for periodically removing water from cathode flow channels in a fuel cell stack that includes looking at the resulting cell voltage patterns in response to selectively pulsing the cathode airflow during. If the fuel cell stack has been in an extended low power condition for a predetermined period of time, the cathode airflow is pulsed, and the output voltage of each cell is measured to determine the difference between the cell voltages. If the cell voltages significantly vary, then the cathode airflow is pulsed more frequently, and if the cell voltages cells are sufficiently close, then the cathode air is pulsed less frequently. The propose water management diagnosis can be used in a control system to determine the frequency of cathode air pulsing.

The invention discloses an intelligent water meter with a water leakage preventing function. The intelligent water meter comprises a hardware system and a software system, and the hardware system comprises a mixed signal controller, an IC (integrated circuit) card, an IC card interface, a liquid crystal display, an electric-control valve control interface, a water quantity collecting and monitoring component, a driving motor and an acoustic alarming circuit; the software system adopts modular processing and is composed of main control programs and functional sub programs, and the main control programs include system initialization, state judgement, flow pulse and water consumption processing, alarm prompting and low-power-consumption mode processing; the functional sub programs include an interface module of the IC card, a power source detection module, a flow monitoring module, a flow judging module, a time monitoring module, a charging processing module and a valve control module. The intelligent water meter integrates prepayment, gradient water charging, fault detection, the alarming function and the water leakage preventing function.

A fuel cell system includes a fuel cell stack and a flow control device that controls a supply of a first phase fluid flowing through the fuel cell stack. A controller monitors at least one parameter of the fuel cell stack and controls the supply to generate pulses of reactant when the at least one parameter crosses a threshold to flush a second phase fluid from said fuel cell stack.

The invention discloses a non-touching slurry pulse destructor in the high-speed paper flow transmitting system, which comprises the following parts: air chamber, elastic rubber diaphragm, two-segmented slurry pipe connecting rapid-expanding rectangle slurry-stable pipe, wherein the cross-sectional area of rapid-expanding rectangle slurry-stable pipe is larger than slurry pipe's; one end of rapid-expanding rectangle slurry-stable pipe is closed and the other end connects air chamber; the elastic rubber diaphragm is set between rapid-expanding rectangle slurry-stable pipe and air chamber, which connects inlet and outlet pipe separately. The invention adds rectangle slurry-stable pipe to increase bulk, which can control action according to real working condition due to air chamber.

The invention relates to a rapid nondestructive testing method for freshness based on air-flow pulse and laser ranging. The rapid nondestructive testing method comprises the following steps: S1, acquisition of a sample and displacement information and formation of a displacement curve; S2, determination of freshness evaluation indexes; S3, extraction of six parameters from the displacement curve obtained in the S1; S4, fitting of the displacement curve obtained in the S1 by using a multivariate function so as to obtain six multivariate function fitting characteristic parameters; S5, establishment of three regression prediction models; and S6, comparison of the precision of the three regression prediction models so as to obtain an optimal freshness prediction model through which the predicted values of the freshness evaluation indexes of a to-be-tested livestock meat sample can be obtained. The rapid nondestructive testing method provided by the invention has the advantages of non-destructiveness, rapidness and no loss.

A system and method for controlling hydrogen gas flow to an anode side of a fuel cell stack using a pressure regulator in the event that an injector that normally injects the hydrogen gas into the fuel cell stack has failed in a stuck open position. During normal operation, the control of the injector is determined based on the pressure of an anode sub-system and the position of the pressure regulator is determined based on a supply pressure between the pressure regulator and the injector. If it is determined that the injector is stuck in an open position, then the position of the pressure regulator is controlled to the anode pressure instead of the supply pressure. If the pressure regulator is an electrical pressure regulator, then it is pulsed to mimic normal system operation. Alternately, another valve, such as a shut-off valve, can be employed to provide the flow pulsing.