38 results about "Pulse pressure wave" patented technology

An apparatus 300 for simulating a pulsed pressure induced cavitation technique (PPCT) from a pressurized working fluid (F) provides laboratory research and development for enhanced geothermal systems (EGS), oil, and gas wells. A pump 304 is configured to deliver a pressurized working fluid (F) to a control valve 306, which produces a pulsed pressure wave in a test chamber 308. The pulsed pressure wave parameters are defined by the pump 304 pressure and control valve 306 cycle rate. When a working fluid (F) and a rock specimen 312 are included in the apparatus, the pulsed pressure wave causes cavitation to occur at the surface of the specimen 312, thus initiating an extensive network of fracturing surfaces and micro fissures, which are examined by researchers.

The invention discloses a geothermal pulse pressure wave fracturing system comprising a geothermal well, an instrument, a pulse pressure wave generator, a pressure pump and a water tank, wherein the output end of the pulse pressure wave generator is connected with one end of a pulse pressure wave control valve, a water outlet of the water tank is connected with a water inlet of the pressure pump, and a water outlet of the pressure pump is connected with one end of a water pump control valve. The invention also discloses a geothermal pulse pressure wave fracturing method which adopts a mode of combining static pressure with pulse pressure to fracture a stratum layer and clean an original geothermal channel, the static pressure is generated by the pressure pump and pressure liquid, and the pulse pressure is generated by the pulse pressure wave generator. By adopting the system and method disclosed by the invention, ultrasonic waves are superimposed to the geothermal well fracturing static pressure to generate a long-distance, large-scale, periodical and continuous pressure acting area and result in that the wall of the geothermal well is ruptured, so that a new hot spring flowing channel is formed; and the pulse pressure waves are mechanical energy waves, so that rock cracks can be further expanded until a satisfactory fracturing effect is achieved.

The invention discloses a method for detecting the blockage condition inside a pressure pipeline by using a pulse pressure wave, and belongs to the technical field of pipeline detection. The method includes the following steps that 1, the pulse pressure wave is emitted at an inlet of the pressure pipeline by a solenoid valve; 2, a high-frequency dynamic pressure sensor A is arranged at the inlet of the pressure pipeline, a pulse pressure wave signal S1 at the inlet is recorded, a high-frequency dynamic pressure sensor B is arranged in the position in the distance L away from the inlet of the pressure pipeline, and a pulse pressure wave signal S2 in the position is recorded; 3, the S1 and the S2 are analyzed, a pulse pressure wave propagation speed C and a pulse pressure wave attenuation coefficient eta are obtained; 4, the S2 is analyzed, and the blockage condition is obtained. With the method, the solenoid valve is opened and closed quickly to emit the pulse pressure wave actively inthe pipeline, and effective information in the incident wave and the reflected wave of the pulse pressure wave is analyzed, so that the number and the types of blockage sections can be judged accurately, the blockage positions, the blockage rate and the blockage length can be obtained, and the method is easy and convenient to operate and high in precision.

An apparatus 300 for simulating a pulsed pressure induced cavitation technique (PPCT) from a pressurized working fluid (F) provides laboratory research and development for enhanced geothermal systems (EGS), oil, and gas wells. A pump 304 is configured to deliver a pressurized working fluid (F) to a control valve 306, which produces a pulsed pressure wave in a test chamber 308. The pulsed pressure wave parameters are defined by the pump 304 pressure and control valve 306 cycle rate. When a working fluid (F) and a rock specimen 312 are included in the apparatus, the pulsed pressure wave causes cavitation to occur at the surface of the specimen 312, thus initiating an extensive network of fracturing surfaces and micro fissures, which are examined by researchers.

The invention discloses a gas pulse pressure generator and a pressure generating method based on impact switching, and belongs to the technical field of measurement and testing. The gas pulse pressuregenerator based on impact switching disclosed by the invention comprises a gas source, a gas pressure-stabilizing and pressure-regulating mechanism, an excitation source, a piston rod, a piston cylinder, a spring, a pressure chamber and a sensor. The invention also discloses a pressure generating method based on impact switching. The position of the piston rod is adjusted by changing the excitation source to realize cooperative switching between through holes of the piston rod and the pressure chamber in order to adjust the pulse width of pulse pressure, so that high pulse width controllability and high waveform stability are achieved. The generated pulse pressure amplitude can be adjusted by adjusting the pressure-stabilizing and pressure-regulating mechanism, so that high amplitude repeatability is achieved. The gas pulse pressure generator has the advantages of simple and reliable structure, and convenience in operation and later maintenance. Through adoption of the gas pulse pressure generator and the pressure generating method, the pulse pressure waveform, the pulse width and the amplitude can be adjusted accurately in a controllable manner, so that the calibration demand ofa dynamic pressure sensor in test fields is met. The test fields include generator, cannonball and high-speed train test fields.

An apparatus 300 for simulating a pulsed pressure induced cavitation technique (PPCT) from a pressurized working fluid (F) provides laboratory research and development for enhanced geothermal systems (EGS), oil, and gas wells. A pump 304 is configured to deliver a pressurized working fluid (F) to a control valve 306, which produces a pulsed pressure wave in a test chamber 308. The pulsed pressure wave parameters are defined by the pump 304 pressure and control valve 306 cycle rate. When a working fluid (F) and a rock specimen 312 are included in the apparatus, the pulsed pressure wave causes cavitation to occur at the surface of the specimen 312, thus initiating an extensive network of fracturing surfaces and micro fissures, which are examined by researchers.

A wearable sensing band is presented that generally provides a non-intrusive way to measure a person's cardiovascular vital signs including pulse transit time and pulse wave velocity. The band includes a strap with one or more primary electrocardiography (ECG) electrodes which are in contact with a first portion of the user's body, one or more secondary ECG electrodes, and one or more pulse pressure wave arrival (PPWA) sensors. The primary and secondary ECG electrodes detect an ECG signal whenever the secondary ECG electrodes make electrical contact with the second portion of the user's body, and the PPWA sensors sense an arrival of a pulse pressure wave to the first portion of the user's body from the user's heart. The ECG signal and PPWA sensor(s) readings are used to compute at least one of a pulse transit time (PTT) or a pulse wave velocity (PWV) of the user.

The invention belongs to the technical field of medical instruments, and provides a pressure wave balloon catheter which is provided with a working balloon used for expanding a diseased region and anopening balloon used for opening the diseased region of a blood vessel, and the working balloon and the opening balloon are adjacently arranged. At least one working electrode unit capable of generating pulse pressure waves is arranged in the working balloon; the opening balloon is arranged at the front end of the balloon catheter, at least one opening electrode unit is arranged in the opening balloon, and each opening electrode unit comprises a head end electrode pair and an output mechanism used for limiting the output direction of pulse pressure waves generated by the head end electrode pair. The structure of the pressure wave balloon catheter is improved, the passing ability of the balloon catheter in a blood vessel is ensured, and an operation can be normally carried out.

A high-speed slurry pulse generator comprises a flowing cylinder, a restrictor ring, an upper part mounting plate, a lower part mounting plate, a slurry filter, a piston bin upper part connector, a piston bin, an original force spring, a piston, a piston connecting rod, a moving valve, a control valve, a driving shaft, a though shaft, a driver, a driver bin and the like. The device uses pressure difference produced at the two ends of the restrictor ring, the piston is driven by the control valve, and the moving valve is driven to move to change overflow area of the restrictor ring to cause pressure impulse. A pressure-release hole and a spacing hole in the though shaft are adopted for piston spacing, and the high-speed slurry pulse generator has the characteristics of energy conservation, high speed and high reliability. When the driver adopts an electromagnet, sliding open-and-close control to the control valve can be performed so as to produce impulse pressure waves; and when the driver adopts a reducing motor, continuously rotating open-and-close control to the control valve can be performed, so as to produce continuous pressure wave and carry out wireless data transmission while drilling.

Apparatus and methods for calculating cardiac output (CO) of a living subject using applanation tonometry measurements. In one embodiment, the apparatus and methods build a nonlinear mathematical model to correlate physiologic source data vectors to target CO values. The source data vectors include one or more measurable or derivable parameters such as: systolic and diastolic pressure, pulse pressure, beat-to-beat interval, mean arterial pressure, maximal slope of the pressure rise during systole, the area under systolic part of the pulse pressure wave, gender (male or female), age, height andweight. The target CO values are acquired using various methods, across a plurality of individuals. Multidimensional nonlinear optimization is then used to find a mathematical model which transformsthe source data to the target CO data. The model is then applied to an individual by acquiring physiologic data for the individual and applying the model to the collected data.

The invention discloses a medical breathing machine in an air duct positive-pressure high-frequency ventilating mode. The medical breathing machine adopts an air duct positive-pressure ventilating mode, a high-frequency pulse pressure wave with adjustable amplitude, frequency and duration is increased in the pressure level of an air duct positive-pressure ventilating mode, and the ventilating modes can be divided into at least seven types, namely single-level positive-pressure high-frequency ventilation, double-level inspiration phase high-frequency ventilation, double-level expiration phase high-frequency ventilation, double-level expiration and inspiration two-phase high-frequency ventilation, proportional ventilation inspiration phase high-frequency ventilation, proportional ventilation expiration phase high-frequency ventilation, and proportional ventilation inspiration phase and expiration phase high-frequency ventilation. By superposing vibration amplitude, vibration frequency and vibration time duration on different treatment pressures in different breathing sections to generate the high-frequency ventilating pressure of the air duct, the smoothness of the air duct and the increase of the pulmonary ventilation in ventilation treatment are achieved, and the blood oxygen concentration and the carbon dioxide concentration are adjusted.

The invention discloses a magnetorheological fat-based self-powered damping adjustment device, which comprises a damping system and an energy conversion and storage system, wherein the damping system comprises a magnetorheological fat working cylinder and a magnetorheological fat damping adjustor for adjusting the pressure difference of two working cavities of the magnetorheological fat working cylinder to form a damping force; and the magnetorheological fat damping adjustor is supplied with power by an electrical energy storage circuit of the energy conversion and storage system. The magnetorheological fat is adopted as a damping medium and has high stability in long time, and the energy conversion and storage system converts alternating pulse pressure fluctuation generated by structural vibration in the two cavities of the magnetorheological fat working cylinder into electrical energy to realize novel efficient vibration energy collection and storage, provide the electrical energy for the magnetorheological fat damping adjustor and ensure the energy supply of the whole magnetorheological controllable damping system without needing external energy input.

The invention discloses a device for driving a shear valve to generate pulse pressure waves by utilizing liquid power and a method thereof. An elastic reset device is used for giving an initial position to a plane swing valve rotor, a fixed original angle is formed between the planar swing valve rotor and a planar swing valve stator, when a signal needs to be transmitted, the position of an electromagnet is changed through current, the electromagnet directly drives a pilot control mechanism to move, a runner for communicating high-pressure hydraulic oil with a main piston is opened, the main piston is driven to make contact with the high-pressure fluid, under the action of the high-pressure fluid, the main piston generates longitudinal movement (in the axis direction of a drill column), under the action of a thread transmission conversion device, the longitudinal movement of the main piston is converted into rotary movement, the rotor is further driven to rotate, and the purpose of transmitting pressure waves is achieved.

The invention discloses a multi-directional coupling impulse oscillation type PDC (polycrystalline diamond compact) drill bit. The multi-directional coupling impulse oscillation type PDC (polycrystalline diamond compact) drill bit is composed of a drill bit joint, a coupling impulse pup joint, a drill bit body, a fluid entrance port, a right feedback flow channel, a right jet flow channel, a rightsplitter plate, a right fluid outlet, pins, a left feedback flow channel, a left jet flow channel, a left splitter plate and a left fluid outlet. According to the multi-directional coupling impulse oscillation type PDC (polycrystalline diamond compact) drill bit, in the working process, drilling fluid flows inside from the drill bit joint, then passes through the coupling impulse pup joint and flows out from a bit port, when the drilling fluid flows through the coupling impulse pup joint, the coupling impulse pup joint can generate axial impulse pressure fluctuation to form axial vibration, four groups of flow channels are uniformly distributed on the circumference of the coupling impulse pup joint, and axial vibration generated by one single group of flow channels can be coupled togetherthrough the superposition principle and acts on the drill bit so as to help the drill bit in rock breaking. The multi-directional coupling impulse oscillation type PDC (polycrystalline diamond compact) drill bit has the advantages that axial impulse vibration is formed through the action of the drilling fluid, so that the rock breaking efficiency of the drill bit can be improved, and the well drilling cost is lowered.

The invention discloses a pulse cleaning tool. The pulse cleaning tool is composed of a jet spray head, a shell, an overflowing disc, a spring, a valve rod, a valve seat, an O-shaped ring and a sealing ring; an oblique jet hole is machined in the front end of the jet spray head, a tangential jet hole is formed in the circumferential direction of the jet spray head, the jet spray head is connectedwith the shell through threads, the valve seat is connected with right-end threads of the shell through threads, the two ends of the shell are open, the valve seat is in a splayed shape, the large-end opening of the splayed shape of the valve seat is provided with the overflowing disc, the lower end of the valve rod is inserted into a center hole of the overflowing disc, the head of the valve rodis larger than the small-end opening of the splayed shape of the valve seat and is propped against the small-end opening of the valve seat, the spring is arranged on the valve rod, an overflowing hole is machined in the overflowing disc, and a sealing ring on the valve rod is in contact with the valve seat. The tool has the beneficial effects that the oblique and tangential water jets generated by the jet spray head form a swirling flow field inside a pipeline, and all-directional cleaning can be realized; and meanwhile, a pulse pressure wave is formed inside the pipeline through a pulse jetflow principle.

The present invention is a burner system that allows ‘quasi continuous burning’ of fluids at very high temperatures by using controlled continuous pulsing explosions or detonations instead of continuous flow and thus creating pulsing pressure waves that can be easily utilised for increasing heat exchanger efficiency. After initiation the explosions or detonations are maintained by use of infrared radiation. The pulsed explosions or detonations send their shock waves directly onto the heat exchanger walls thus introducing a bigger part of energy into the heat exchanger wall then would be possible with any other method of heat exchange. In addition the kinetic energy of the negative acceleration of the mass in the explosion or detonation wave is added as additional heat introduced into the heat exchanger walls.

Apparatus and methods for calculating cardiac output (CO) of a living subject using applanation tonometry measurements. In one embodiment, the apparatus and methods build a nonlinear mathematical model to correlate physiologic source data vectors to target CO values. The source data vectors include one or more measurable or derivable parameters such as: systolic and diastolic pressure, pulse pressure, beat-to-beat interval, mean arterial pressure, maximal slope of the pressure rise during systole, the area under systolic part of the pulse pressure wave, gender (male or female), age, height and weight. The target CO values are acquired using various methods, across a plurality of individuals. Multidimensional nonlinear optimization is then used to find a mathematical model which transforms the source data to the target CO data. The model is then applied to an individual by acquiring physiologic data for the individual and applying the model to the collected data.

The invention provides a variable-flow pulse hydraulic fracturing process, which relates to the field of hydraulic fracturing stimulation of oil and gas wells. The following steps are sequentially included: S1, injecting fracturing fluid at a constant flow rate and recording the change of wellhead pressure, and stopping the injection when the wellhead pressure is close to the safe pressure; S2, calculating the propagation velocity of the pressure wave in the liquid; S3, calculating the flow adjustment time; S4. Find out the wellhead pressure corresponding to the injection stop time and the flow adjustment time according to the recorded wellhead pressure over time, and calculate the corresponding pressure difference between the two times, and estimate the flow adjustment amplitude according to the pressure difference. S5. Redesign the pulse-changing flow injection scheme according to the above calculation results, and perform the fracturing operation again. The invention utilizes the pulse pressure wave generated by the sudden pulse injection flow to carry out fracturing operation on the reservoir layer, which can effectively perform fracturing operation on the reservoir layer with poor physical properties, low porosity and high fracture strength, and improves the fracturing effect.

A chemical pulse compound plugging removal method, characterized in that the chemical agent is directly injected into the wellbore and the oil layer by connecting the pipeline to the wellhead casing and connecting the cement truck after selecting the chemical agent and the dosage under the condition of not moving the pipe string. After the injection of the agent, close the casing and react for 2 to 3 hours, then connect the pulse generator, inject gas into the wellbore through the casing, and after the pressure in the well reaches a certain value, use the pulse generator to rapidly reduce the pressure according to the pressure gradient to generate pressure. The pulse wave causes formation plugs to produce a composite effect of pulse and chemical plugging agent under the action of pressure waves alternately changing in positive and negative directions. The invention has simple construction, does not use pipe strings, shortens the construction period, saves construction costs, improves the plugging removal effect of the oil well, and increases the crude oil output.

The invention discloses a high-temperature vertical well inclinometer, and aims to solve the problems of long measurement period, low measurement efficiency and inconvenience in maintenance caused by complex structure, large size and low data uploading speed of an inclinometer in the prior art. The inclinometer comprises an inclinometer body; the inclinometer body comprises a pulse generator module, a hydraulic mechanism module and a main control circuit module; the main control circuit module obtains well deviation parameters and converts the well deviation parameters into control signals to enable the hydraulic mechanism module and the pulse generator module to do axial reciprocating motion to generate different pulse pressure waves, and then the different pulse pressure waves are decoded through a ground differential pressure sensor, a decoder and the like to obtain underground parameters. The inclinometer body is modularly designed, so that the inclinometer is small in size, light in weight and convenient to manufacture and assemble; the invention has the advantages of simple structure, short length, low power consumption, high decoding rate and fast data transmission; the device is suitable for high-temperature and high-pressure environments, the measurement period is shortened, the measurement efficiency is improved, and the working time is prolonged.

The invention discloses a blood pressure measurement method and system, and the measurement method comprises the steps: employing a pressure sensor to apply pressure to a radial artery in a stepped pressurization mode, collecting pulse pressure waves, and synchronously measuring a pressure value and time; determining instant pressure values of a pulse pressure wave appearing point A, a maximum amplitude point W and a vanishing point B by using multiple groups of observation data; and accurately obtaining the diastolic pressure DP, the average arterial pressure MAP, the systolic pressure SP andthe pulse rate Pr corresponding to the points A, W and B through pulse wave pressure / blood pressure conversion calculation.

The invention relates to a motor vehicle air-conditioning loop comprising a compressor (1) connected to a condenser and to an evaporator by means of pipes, each of which includes a rigid pipe (3a) connected to a flexible pipe (3b), as well as a volume expansion chamber (8) which dampens the pulsed pressure waves generated by the compressor (1) and is arranged between the compressor (1) and one of the flexible pipes (3b), characterized in that said volume expansion chamber (8) is connected directly to the inlet (9) or to the outlet of the compressor (1).

The invention provides a non-contact cerebrospinal fluid pulse pressure wave monitoring device based on magnetic induction. The non-contact cerebrospinal fluid pulse pressure wave monitoring device based on magnetic induction comprises an AC signal source unit, a sensor unit, a differential amplifier and a signal acquisition and processing unit. The AC signal source unit is used for generating an excitation signal, sending the excitation signal to the sensor unit, generating an excitation magnetic field and a reference signal and sending the reference signal to the signal acquisition and processing unit. The sensor unit is placed at the cisterna magna under the occipital bone and comprises an annular excitation coil and two detection coils, wherein the two detection coils are located above and below the excitation coil respectively and coaxial with the excitation coil, and the sensor unit is used for emitting excitation signals and detection and induction signals. The differential amplifier is used for carrying out differential amplification on the signals of the two detection coils to offset a main magnetic field in the detection signals. The signal acquisition and processing unit is used for processing the collected signals to obtain cerebrospinal fluid pulse pressure waves.

A computer implemented method for noninvasively measuring a cardiovascular parameter of a subject includes splitting time varying pulse plethysmographic or pulse pressure waveform (PW) cycles into individual PW cycles, selecting an individual PW cycle as a query cycle, screening a library of synthetic PW cycles with the query cycle to find a solution PW, and reporting a model parameter associated with the solution PW. A system for monitoring a cardiovascular parameter includes a monitoring device and a computer with software to perform the method.

A method for pressure pipe blocking status detection using a pulse pressure wave, comprising the following steps: 1, using a solenoid valve to emit a pulse pressure wave at the inlet of a pressure pipe; 2, providing a high-frequency dynamic pressure sensor A at the inlet of the pressure pipe to record a pulse pressure wave signal S1 here, and providing a high-frequency dynamic pressure sensor B at a position at a distance of L from the inlet of the pressure pipe to record a pulse pressure wave signal S2 here; 3, analyzing the S1 and the S2 to obtain the propagation velocity C of the pulse pressure wave and the attenuation coefficient η of the pulse pressure wave; and 4, analyzing the pulse pressure wave signal S2 to obtain a blocking status. In the method, the solenoid valve is rapidly opened and closed to actively emit a pulse pressure wave in the pipe, and effective information in the incident waves and the reflected waves of the wave are analyzed. Therefore, the number and types of blocked segments can be determined accurately; blocking positions, rate and length can be obtained; and the method is simple in operation and high in precision.

The invention provides a non-contact cerebrospinal fluid pulse pressure wave monitoring device based on magnetic induction. The non-contact cerebrospinal fluid pulse pressure wave monitoring device based on magnetic induction comprises an AC signal source unit, a sensor unit, a differential amplifier and a signal acquisition and processing unit. The AC signal source unit is used for generating an excitation signal, sending the excitation signal to the sensor unit, generating an excitation magnetic field and a reference signal and sending the reference signal to the signal acquisition and processing unit. The sensor unit is placed at the cisterna magna under the occipital bone and comprises an annular excitation coil and two detection coils, wherein the two detection coils are located above and below the excitation coil respectively and coaxial with the excitation coil, and the sensor unit is used for emitting excitation signals and detection and induction signals. The differential amplifier is used for carrying out differential amplification on the signals of the two detection coils to offset a main magnetic field in the detection signals. The signal acquisition and processing unit is used for processing the collected signals to obtain cerebrospinal fluid pulse pressure waves.