1406 results about "Fluid pressure" patented technology

An auto-occlusion safety device is provided for use in preventing rupture of infusion components during rapid infusion procedures. An occlusion valve is disclosed having a threshold pressure that is less than a rupture tolerance of the infusion system components. As the fluid pressure of the infusion system increases beyond the threshold pressure of the occlusion valve, the occlusion valve is automatically activated thereby occluding fluid flow upstream from a vulnerable infusion component. An accumulator is further disclosed for use in combination with the safety device to compensate for time delays in full activation of the occlusion valve.

The invention provides a control method and device for cleaning equipment, the equipment, a medium and a program product, and can be applied to the technical field of liquid cooling servers. The method comprises the steps of determining a pressure difference value between a reference pressure value and a real-time pressure value of fluid at an outlet of a target pump in the cleaning equipment; a preset pressure control parameter is used for processing the pressure difference value based on a lag relation, a rotating speed adjusting signal is determined, and the lag relation indicates the lag degree between the rotating speed change moment of the target pump and the change moment of the collected fluid pressure value; the target pump is controlled to operate based on the rotating speed indicated by the rotating speed adjusting signal to adjust the output flow of the target pump, so that the adjusted pressure value is close to the reference pressure value; wherein the pressure control parameter is obtained by performing simulation calculation on a hysteresis relation based on an inertia time constant and pressure wave propagation delay time of the fluid at the outlet of the target pump.

The utility model discloses a one-way valve with a pressure relief protection function, and particularly relates to the technical field of one-way valves, which comprises a valve body, a discharge pipe is arranged at one end of the valve body in a penetrating manner, an outer valve sleeve is arranged on one side of the valve body in a penetrating manner, a pressure relief mechanism is arranged in the outer valve sleeve, and the pressure relief mechanism comprises a pressure relief valve seat arranged in the outer valve sleeve. A guide groove is formed in the outer valve sleeve, a guide ring is slidably arranged in the guide groove, a pressure relief valve element is fixedly arranged in the guide ring, a pressure relief spring is fixedly arranged at the top of the pressure relief valve element, an adjusting disc is slidably arranged on the inner wall of the valve body, and a threaded rod is rotatably arranged on one side of the adjusting disc. When the fluid pressure abnormally rises, the pressure relief channel can be automatically opened, the one-way valve and a conveying system are effectively protected, the position of the pressure relief valve element can be conveniently and manually adjusted, pressure relief parameters are flexibly controlled, and the requirements of different working conditions are met.

A method performed by a computing device for controlling fluid pressure in a fluid distribution network (FDN) above a threshold pressure by communicating with a plurality of pressure control stations distributed throughout the FDN to independently control a fluid pressure at each of the plurality of pressure control stations is provided. The method comprises training a machine learning algorithm to establish one or more correspondences between a measured variation in fluid demand in the FDN for a first time period and measured environmental conditions for the first time period. The method comprises predicting a variation in fluid demand in the FDN for a second, later time period based on predicted environmental conditions for the second time period and the established one or more correspondences between the measured variation in fluid demand in the FDN for the first time period and the measured environmental conditions for the FDN for the first time period. The method comprises determining, based on the predicted variation in fluid demand for the second time period, a variation in fluid pressure to be applied at the plurality of pressure control stations for the second time period to satisfy a fluid pressure condition at one or more pre-determined points in the FDN downstream from the plurality of pressure control stations. The method comprises transmitting, to the plurality of pressure control stations, an indication of the determined variation in fluid pressure to be applied at the plurality of pressure-control stations for the second time period to satisfy the fluid pressure condition at the one or more pre-determined points in the FDN.

The invention discloses a coal seam induced fracturing method. A hydraulic fracturing fluid comprises a basic aqueous phase system and induced functional particles dispersed in the basic aqueous phase system. The prepared hydraulic fracturing fluid is injected into a target stratum at the set displacement and pressure, and an initial main fracture is formed in a reservoir by means of the fluid pressure; in the process, the functional particles in the fracturing fluid enter the crack tip and the potential branch position along with the fluid and are uniformly distributed in a crack channel; along with migration of the fracturing fluid in the stratum, the inducible functional particles act under different triggering conditions, so that the fracture system is evolved into a multi-direction and multi-branch fracture network from a single main fracture, and the transformation volume and the reservoir permeability are increased. Expansion or reaction can be triggered in the fracture, so that stress concentration is generated locally, secondary fracture formation is induced, a complex fracture network is constructed, and reservoir permeability is improved.

In an actuating device for controlling a deceleration device and / or an acceleration device of a vehicle, wherein the actuating device is designed for foot actuation, it is provided that the actuating device has at least one enclosed fluid volume, that at least one pressure sensor is connected to the fluid volume in a pressure-conducting manner, that the pressure sensor is connected to an evaluation device in a signal-conducting manner, that the evaluation device is designed to calculate a deceleration signal and / or an acceleration signal from the fluid pressure determined by means of the pressure sensor. A further aspect of the invention relates to a method for generating a deceleration signal and / or an acceleration signal for controlling a deceleration device and / or an acceleration device of a vehicle by means of an actuating device according to the invention.

The invention discloses a non-pressure fuel oil filling system and method based on fluid driving and mining equipment, and the system comprises a fuel oil tank which is used as a fuel oil storage main body; the receiver serves as an initial channel for fuel oil to enter and comprises a filling port plug, a receiver shell and a filling reset spring, the filling port plug is movably installed at the inlet end of the receiver shell, and the filling reset spring is installed between the filling port plug and the receiver shell in a sleeved mode; the controller is fixed to the side, away from the oil gun, of the receiver, the controller comprises a switching valve element capable of moving in the axial direction, and the switching valve element can open or close an oil filling window in the controller under the action of the fluid pressure difference; the respirator is mounted at the top of the fuel tank and comprises an air intake and exhaust structure for balancing air pressure inside and outside the fuel tank and a cut-off floating ball capable of ascending and descending along with the oil level in the fuel tank; and two ends of the control oil pipe are respectively communicated with the controller and the respirator. The method is suitable for mine scenes, and has both safety and protection.

The utility model discloses a pressure regulator with a silencing function, and belongs to the technical field of pressure regulation and stabilization, an internal silencer and an external silencer are additionally arranged on the basis of the structure of an axial-flow type pressure regulator, when a valve cylinder is separated from a valve clack and a valve port seat, gas flows out through a silencing through hole of the internal silencer, and when the gas flow speed is high enough, the gas flow speed is high enough, and the gas flow speed is high enough. The noise reduction through holes can move the frequency spectrum of exhaust noise to high frequency, the audible sound part in the noise frequency spectrum is reduced, and therefore interference of the noise to the environment is reduced, the noise reduction barrel filled with the spring is arranged in the external silencer, when airflow passes through the spring in the noise reduction barrel, the spring in the noise reduction barrel can absorb kinetic energy generated by airflow impact, and the noise reduction effect is improved. When the airflow passes through the rectifying plate at the open end of the external silencer, the airflow passes through the multiple layers of perforated plates, layered diffusion and pressure reduction are achieved, the pressure and the flow speed of the fluid are reduced, meanwhile, the flow direction of the fluid is integrated, impact on the pipe wall is reduced, and the effect of reducing the noise is achieved.

A battery case leak testing device includes a housing having a testing port. A pump is in fluid communication with the testing port and is configured to generate a prescribed pressure at the testing port. A pressure sensor is in fluid communication with the testing port to measure fluid pressure at the testing port. A controller is in operative communication with the pump and the pressure sensor, and is configured to facilitate operation of the pump in a first mode and a second mode. In the first mode, the pump operates to generate a first prescribed pressure at the testing port. In the second mode, the pump operates to generate a second prescribed pressure at the testing port. The controller transitions the pump from the first mode to the second mode when the pressure sensor measures a prescribed pressure characteristic when the pump is operating in the first mode.

The invention relates to the technical field of sidewall contact force control, and discloses a well wall sidewall contact force control method, which comprises the following steps of: acquiring fluid pressure gradient data, synchronously acquiring contact stress distribution of a working surface, performing synchronous association, acquiring associated data of time-space alignment, and performing fusion processing to eliminate irregular fluctuation; a smoothed pressure and stress correlation data set is obtained; the local stress concentration state is detected in real time, and a control instruction used for adjusting the displacement of the contact execution mechanism is generated; constructing a nonlinear relation model between a pressure and stress associated data set and contact force output, embedding a dynamic compensation mechanism, correcting and fusing the input real-time data to generate a collaborative feedback quantity, and adjusting the displacement of the contact execution mechanism in real time through the collaborative feedback quantity. And the response delay in the adjustment process is compared with a preset time range, and parameters of the dynamic compensation mechanism are adjusted according to a comparison result to form closed-loop control. According to the invention, high-precision and high-robustness control of the sidewall pushing force can be realized.

A door seal for an elevator car includes a first tube and a second tube made of an elastically deformable sealing material; the door seal adapted to be mounted on a car wall and / or car door of the elevator car such that the first and second tubes, when the door closes a door opening in the car wall, lie opposite one another within a door gap in a bridging direction and run at least partially around the door opening. The first tube has a pressure connection and can be deformed, by applying fluid pressure, between an initial shape and a final shape that is enlarged in the bridging direction compared to the initial shape. The second tube has at least one pressure equalization opening that enables pressure equalization between an interior and an environment of the second tube when the second tube is compressed.

The application discloses a heat-driven Rankine cycle system, which comprises a booster assembly and a vortex tube, and can realize the increase of fluid pressure and temperature by using low-grade heat energy without inputting external energy, so as to obtain high-temperature and high-pressure fluid, drive the expander to do work, realize the effective utilization of low-grade heat energy below 100 DEG C, and control the flow between the generator and the high-pressure gas source inlet by a valve, so as to match the heat required by the heat exchanger.

The invention relates to a fractured rock thixotropic fluid seepage diffusion path characterization method, and belongs to the technical field of geotechnical engineering. The method comprises the following steps: constructing a fractured rock mass network geometric model based on geological exploration data; constructing a fluid seepage constitutive equation according to the thixotropic fluid characteristic parameters; grid division is carried out based on the constructed fractured rock mass network model, a one-dimensional fluid seepage channel is assembled, and dimension reduction solving of a complex problem is achieved; fluid pressure and fluid seepage velocity parameters are obtained through iterative solution, and a fluid characteristic parameter change rule is updated in real time; and generating and outputting a fluid seepage diffusion behavior tracking result under a set working condition based on the simulation state quantity. Compared with the prior art, the method has the advantages that the complex fluid diffusion rule caused by the thixotropic fluid viscosity time-varying characteristic can be accurately described, the method is suitable for accurate characterization of the grouting diffusion path in geological engineering, and a scientific basis is provided for optimizing construction parameters.

The invention discloses an energy-saving reaming device for geological exploration, and relates to the technical field of geological exploration. The device comprises a supporting body disc, a pinch plate supporting body and a center fixing body, a swinging reaming blade is arranged outside the center fixing body, and the angle of the reaming blade is controlled through water pressure injected into a drill rod. A piston disc, an outer side sleeve, an inner side sleeve and a thread transmission structure are arranged, so that the broaching blade is gradually unfolded; and meanwhile, stable locking of the reaming angle is achieved through cooperation of the locking limiting block and the locking limiting shaft. The device is provided with an exhaust hole, an injection hole and a one-way valve, and it is ensured that fluid pressure is effectively adjusted in the reaming process. Different from a traditional mode that the drill bit needs to be replaced many times, the device can finish reaming of different diameters only through one-time replacement, energy consumption is remarkably reduced, efficiency is improved, and the device is particularly suitable for deep well and shale gas exploitation operation.

The invention belongs to the technical field of flow measurement and control, and discloses a laminar flow mass flow control system and method based on feed-forward compensation and cascade control. In the system, a laminar flow element is provided with a low-voltage side detection port and a high-voltage side detection port; the low-pressure side detection port is connected with the low-pressure ends of the pressure sensor and the differential pressure sensor, and the high-pressure side detection port is connected with the high-pressure end of the differential pressure sensor; the laminar flow element is connected with the regulating valve; the output end of the pressure sensor is connected with the input end of the feedforward compensation module; the output end of the A / D converter is connected with the input end of the main controller and the input end of the auxiliary controller; the output end of the main controller is connected with the input end of the auxiliary controller. The output end of the feed-forward compensation module is connected with the control end of the regulating valve; the output end of the auxiliary controller is connected with the control end of the adjusting valve through the D / A converter. The feed-forward compensation and cascade control technology is adopted, the pressure feed-forward compensation module and the differential pressure pair control loop are additionally arranged, and the problem that the flow precision of a control system is not accurate due to sudden change of fluid pressure is solved.

The application provides a hydraulic pump fluid flow pulsation characteristic representation method based on digital twin technology, and relates to the technical field of fluid pressure measurement. First, a theoretical structure model of the measured hydraulic pump is established by using AMEsim simulation software; second, a pump source pressure pulsation test system of the measured hydraulic pump is built, a throttle valve is used to simulate load change, and a data acquisition system is used to collect pressure pulsation signals, temperature signals and average flow signals of the outlet fluid of the measured hydraulic pump; the collected signals are processed and used as input parameters of the theoretical structure model of the measured hydraulic pump; finally, the theoretical structure model of the measured hydraulic pump is simulated and calculated, the simulation model parameters are modified, the simulation obtained pressure pulsation curve is compared with the measured pressure pulsation curve, and the final parameters of the theoretical structure model parameters of the measured hydraulic pump are gradually determined. The application is simple to realize, convenient to operate, can meet the requirement of engineering precision, and greatly saves experimental cost and time cost.

The utility model discloses a Bernoulli equation experimental device applied to teaching, and mainly solves the problem that the existing experimental device is large in size. The experimental device comprises a main glass tube platform, a self-circulating main glass tube which is arranged on the main glass tube platform and is provided with a plurality of bent sections, a water pump which is arranged on the main glass tube and is used for realizing fluid self-circulation, a flow meter which is arranged on the main glass tube and is used for measuring fluid flow, and a plurality of test interfaces which are arranged on the main glass tube, and the pressure measuring device is connected with the testing interface and is used for measuring fluid pressure. According to the utility model, a semi-closed fluid self-circulation structure is adopted, and the fluid self-circulation of the experimental device is realized under the action of the water pump, so that the structures such as an open water tank of the traditional Bernoulli experimental device are omitted. And compared with a long straight pipeline of traditional experimental equipment, the main pipeline is bent, so that the miniaturization of the experimental device is realized. The closed main pipeline structure also prevents the fluid from scattering in the laboratory, and ensures that the ground of the laboratory is dry and clean.

The invention discloses a shaft scaling prediction method and system based on a transfer function and machine learning. The method comprises the steps that scaling prediction basic parameters such as fluid pressure, temperature, flow velocity and ion concentration in an oil and gas shaft are obtained and imported into an oil and gas shaft scaling dynamic analysis platform; calling a seepage coupling transfer function scaling prediction model to process seepage related parameters, and establishing a correlation between a fluid seepage state and a scaling initial trend; starting a dynamic transfer function out-of-bag scaling algorithm to dynamically iterate different depth parameters, and outputting a preliminary scaling amount; correcting a preliminary result through a chemical thermodynamic transfer function correction algorithm in combination with parameters such as temperature; and a machine learning model is adopted to train a corrected result and a shaft position parameter, a mapping model is established, a dynamic scaling prediction curve is output, and the platform carries out visualization processing on the curve. The system is matched with the method to realize parameter acquisition, processing, calculation, correction, modeling and display, and the scaling prediction accuracy and the dynamic adaptability are improved.

The invention discloses a CO2 directional fracturing target layer crack propagation simulation control method based on flow regulation and control. The method comprises the steps that a plurality of experimental coal samples are manufactured, and drill holes are formed; the fracturing pump inputs CO2 with set flow into the coal sample through the CO2 injection pipeline; the high-frequency dynamic pressure sensor collects fluid pressure data in the coal sample crack; the acoustic emission sensor monitors and obtains the crack initiation moment and crack initiation pressure of the coal sample; the method comprises the following steps: carrying out cracking and crack width monitoring on a coal sample, calculating a theoretical value of crack initiation pressure and a theoretical value of CO2 injection flow of the coal sample, injecting supercritical CO2 fluid into the coal sample, obtaining a first-stage correction coefficient and a second-stage correction coefficient of the CO2 injection flow, and calculating a corrected CO2 injection flow value. According to the method, under the multi-physical-field coupling environment, the crack initiation pressure of the coal body can be accurately measured and calculated, the correlation between the CO2 injection flow and the crack width of the coal body is established, and the CO2 injection flow better meets the actual requirements of field operation through a CO2 injection flow grading correction mechanism.

A method for evaluating contribution of each component to shale oil reservoir resistivity at high temperature and high pressure is applied to the field of oil exploration and development. The method comprises the following steps: (1) analyzing the volume percentage of each clay mineral, the pore water content and the mineralization degree of the shale oil reservoir pressure-maintaining closed core; (2) when the fluid pressure is greater than 23MPa, measuring the resistivity of the pressure-maintaining closed rock core at each temperature point; (3) carrying out water balance treatment on pure clay minerals, namely kaolinite, montmorillonite, illite and chlorite, and measuring the resistivity at each temperature point when the fluid pressure is greater than 23MPa; (4) when the fluid pressure is greater than 23MPa, measuring the resistivity of each temperature point of the solution consistent with the mineralization degree of the pore water; and (5) constructing a resistivity evaluation model, and evaluating the contribution of each component to the resistivity of the shale oil reservoir under the condition of high temperature pressure.

Methods and systems are provided for controlling braking to avoid groan noise in a braking system. The system has a brake actuator configured to apply a friction force to a moving member, a conduit system coupled with the brake actuator, an inlet valve in the conduit system configured to control fluid pressure delivered to the brake actuator, and an outlet valve in the conduit system configured to control fluid pressure released from the brake actuator. The system includes a controller to monitor for an upper target pressure condition in the braking system, wherein the upper target pressure condition is associated with a noise zone; and operate, when the upper target pressure is detected and in a noise zone avoidance mode, the inlet valve and the outlet valve to avoid brake pressures that generate a brake noise from the friction force.

The invention belongs to the technical field of numerical simulation, and provides an implicit hydraulic fracturing simulation calculation method based on finite element-near field dynamics. According to the method, firstly, a hydraulic fracturing model is divided into three parts including solid deformation, crack propagation and flowing of fluid in a porous medium; a solid deformation part is simulated by a finite element, and near-field dynamic material points are arranged in a possible crack development area. In the crack propagation part, crack initiation is judged by a near-field dynamics method, and crack propagation is simulated. The flow of the fluid in the porous medium comprises the flow of the fluid in the crack and is simulated by a finite element. And finally, through fully implicit solution of the fluid-solid coupling equation set, an expansion path of hydraulic fracture, a fracture deformation mode and fluid pressure in the porous medium can be accurately predicted, and dynamic modeling and efficient simulation of propagation of the hydraulic fracture in the porous medium are realized.

The invention relates to a gas tunnel self-rotating type asymmetric water jet slotting device which comprises a slotting device body, a middle body, a valve element, a front end and a rear end, the front end and the rear end are arranged at the front end and the rear end of the slotting device body respectively, the middle body is rotationally arranged in the slotting device body, the valve element is slidably arranged in the middle body, and the valve element is arranged in the middle body. The rear end head is communicated with the interior of the middle body; a lateral hole is formed in the middle rear part of the middle body, a nozzle is mounted on the lateral hole, and a main body discontinuous hole is formed in the slotting device main body. The invention further provides a using method of the device. On the premise that the drill rod stops rotating, the rotary cut-off type high-pressure pulse water jet is jetted outwards only by changing the pressure and flow of input fluid, the coal rock breaking capacity is high, the structure is simple, operation is convenient, and economical and practical effects are achieved.

The invention relates to the field of harmonic reducers, in particular to a harmonic reducer applicable to frequent knee joint flexion and extension of a robot, which comprises a high-speed shaft, a low-speed shaft, an outer hub, a flexible gear, an elliptical gear and a flexible bearing which are concentrically arranged; the fluid driving mechanism is arranged in the circulating flow channel, and the fluid driving mechanism is driven by the high-speed shaft. According to the harmonic reducer, the circulating flow channel is formed in the harmonic reducer, and the lubricating oil in the circulating flow channel is driven to flow through the high-speed shaft, so that heat of the movable parts is transferred to the outer hub, heat dissipation of the harmonic reducer is enhanced, and friction force between the movable parts in the harmonic reducer is reduced through the fluid pressure characteristic.

A completion assembly suitable for use in a wellbore, the completion assembly having a power charge mandrel engaged with a downhole tool in a run-in configuration. A power charge or other pyro-technique is disposed in the power charge mandrel in a run-in configuration. Fluid pressure created or increased in the power charge mandrel is conveyed to the downhole tool in a manner that results in movement of the completion assembly to a disconnected configuration. In the disconnected configuration the power charge mandrel is disengaged from the downhole tool, and the power charge mandrel is retrievable out of the wellbore.

The invention relates to the technical field of data processing, in particular to an elastic frame optimization design method and system based on the finite element theory, and the method comprises the steps: constructing a nonlinear finite element model of an elastic frame, and for each node, determining the sealing reliability of the node based on the normal contact stress value, fluid pressure value and displacement vector of the node; for each unit, determining a fluid permeation trend factor of the unit based on the sealing reliability of the nodes in the unit, remodeling a material relative density iterative updating formula of the optimization criterion method by using the fluid permeation trend factor, updating the material relative density of each unit, generating an optimal topological configuration, and carrying out the optimal topological configuration; therefore, the optimal design of the elastic frame is completed. According to the method, the problem of high-pressure leakage caused by neglecting microscopic sealing in traditional topological optimization is solved, and synchronous optimization of the structural rigidity and the sealing performance under the ultrahigh-pressure working condition is achieved.

A brake control system for a vehicle includes electropneumatic modules that control fluid pressure to brake actuators for wheel brakes to apply and release service and parking brakes. A parking brake controller (i) determines whether the parking brake is in an applied state or a released state, (ii) whether a speed of the vehicle meets a predetermined condition relative to a predetermined speed and (iii) whether a command to move the service brake to an applied state has been issued by a service brake controller. When conditions (i), (ii) and (iii) are present, the controller identifies an absence of communication on a communications bus indicative of a failure in the service brake controller and / or the communications bus and thereafter generates a control signal configured to cause to move the parking brake from the released state to an applied state.

A verification system (100) for a vehicle's braking system is described. The system includes a brake pipe (104) for fluid conveyance, a brake cylinder (106) to hold fluid, and adjustment means (108) to modify fluid pressure in the brake cylinder (106) based on the brake pipe (104) pressure and a set relation pattern. Braking means (110) apply force depending on the fluid pressure in the brake cylinder (106). The verification system features a rotary electric generator (112) linked to an axle (A) and first electronic processing means (114) to assess fluid pressure in both the brake pipe (104) and brake cylinder (106). It identifies damage or malfunction if the pressure relationship deviates from the predetermined pattern. Rotary electric generators (112, 202) supply power to electronic processing means (114, 200) when there is no electrical power received by the electronic processing means (114, 200) from offboard the vehicle.

A method of adjusting a position of an infusion container includes determining a current fluid pressure of a first fluid in a fluid path at or upstream of a fluid junction. When the determined current fluid pressure satisfies a predetermined threshold: an indication of a fault condition associated with the current fluid pressure of the fluid being above the predetermined threshold is displayed. A motor operably coupled to the adjustment device automatically changes the height of the infusion container relative to the reference point to an adjusted height that results in a reduced flow of the first fluid beyond the fluid junction that mixes with the flow of the second fluid from the infusion container. The method includes determining an updated fluid pressure of the first fluid in the fluid path after the motor automatically changes the height of the infusion container to the adjusted height.