48 results about "Pressure cycle" patented technology

The invention belongs to the technical field of safety inspection and detection of special equipment, and particularly relates to a gas cylinder limiting temperature and pressure cyclic fatigue test medium flow control device which comprises an inflation and deflation pipe, a gas cylinder limiting temperature and pressure cyclic fatigue test medium flow control device, a gas cylinder limiting temperature and pressure cyclic fatigue test medium flow control device and a gas cylinder limiting temperature and pressure cyclic fatigue test medium flow control device, a first pipe opening and a second pipe opening are formed in the charging and discharging pipe, and one-way mechanisms are arranged between the connecting pipe and the first pipe opening and between the connecting pipe and the second pipe opening. The first pipe opening and the second pipe opening communicate with the connecting pipe, and the opening directions of the two one-way mechanisms are opposite. During use, the first pipe orifice and the second pipe orifice are both located in the gas cylinder. The purpose of the invention is as follows: through the mutual cooperation of the charging and discharging pipe, the first pipe orifice, the first one-way mechanism, the second pipe orifice and the second one-way mechanism, an experimental medium enters and exits from the pipe orifices at different positions of the gas cylinder, so that the experimental medium flows in the gas cylinder, and the temperature of the medium in the gas cylinder is relatively balanced through the flowing of the experimental medium; therefore, the temperature difference of the gas cylinder body is reduced, and the experiment precision is improved.

The invention relates to the technical field of porous carbon washing and filtering, in particular to a porous carbon washing and filtering tank which comprises a washing and filtering tank body, the top of the washing and filtering tank body is fixedly connected with a driving source through a supporting frame, and the output end of the driving source is fixedly connected with a stirring rod through a transmission rod. Through the arrangement of the circulating cleaning mechanism and other components and the mutual matching relation between the driving source and the circulating cleaning mechanism, the rotating motion of a transmission rod can be converted into the rotation of a driving eccentric wheel through a bevel gear pair, and then a compression ring is driven by a connecting rod to do reciprocating motion in a compression column; therefore, the device can achieve the effect of continuous and automatic pressure circulation of pressurization, pressure maintaining and negative pressure in the filter washing tank body only by means of one driving source, the problem of energy attenuation of ultrasonic waves in deep micropores is effectively solved, meanwhile, porous carbon particle damage caused by too strong vibration is avoided through controllable air pressure circulation, and the service life of the filter washing tank is prolonged. Therefore, the problems of incomplete cleaning and material damage mentioned in the background art are solved.

A fluid flow control device for a downhole apparatus, the device comprising a body portion comprising a first fluid flow port and a second fluid flow port, a fluid flow path from the first fluid flow port to the second fluid flow port, and a valve member located in the fluid flow path and configured to be movable from a first, closed position in which the fluid flow path is blocked by the valve member, and a second, open position in which the fluid flow path is open. The valve member is configured to be movable from the first, closed position to the second, open position in response to a valve pressure cycle comprising application of a positive differential pressure from the first flow port to the second flow port, and removal of the positive differential pressure.

A wearable system and methods for modifying properties of eyes are provided. The system includes an ultrasonic device; at least one sealed cavity; a fluid and lighting environment control device; a controller; one or more feedback sensors; and a computing device. The method includes applying vibrations through actuators in contact with an eye socket bone through skin; warming a cavity to set temperature to a first temperature for a period up to a predetermined time except when the temperature exceeds a second temperature; setting vibration cycles after the set temperature is reached; initiating a cavity pressure cycling after the set temperature is reached and after the setting vibration cycles is completed; and completing the cavity pressure cycling and then completing the warming. The system and methods can be applied to surgical treatments, medications, finger massage, or used independently to modify the tissue properties of the eye.

A degassing device removes air dissolved in liquid under a pressure decreased atmosphere. The degassing device includes a liquid tank, a pressure decreasing device, a circulation flow pass, and a circulation device. The liquid tank stores the liquid. The pressure decreasing device decreases pressure in the liquid tank. The circulation flow pass communicates different positions of the liquid tank. The circulation device circulates the liquid through the circulation flow pass. The circulation flow pass includes an outlet port from the liquid tank to the circulation flow pass, and an inlet port from the circulation flow pass to the liquid tank below a liquid surface. A diameter of the inlet port is smaller than a diameter of the outlet port.

A method of aspirating a hematoma from a body space via a catheter coupled to a pump assembly includes advancing a tip of the catheter into proximity with the hematoma within the body space. The pump assembly includes a pump, a motor, a sensor, and a controller. The method further includes actuating the pump assembly to: operate the pump in a first mode during which the motor drives the pump at a first aspiration speed; receive at the controller a pressure signal associated with a catheter pressure from the sensor of the pump assembly; and on a condition that the catheter pressure is below a pressure threshold, operate the pump in a second mode during which the motor drives the pump cyclically between a second aspiration speed and an infusion speed such that the catheter pressure cycles between an upper pressure limit and a lower pressure limit.

A linear escapement mechanism is provided for actuating a downhole tool in a controlled and predictable manner, such as in response to a certain number of pressure cycles. In an example, the actuator includes an escapement sleeve axially moveable with respect to an actuator housing. The escapement sleeve has a plurality of axially-arranged escapement teeth. A rocker secured within the actuator housing has opposing first and second pallets. An operating sleeve is reciprocable to rock the rocker back and forth to alternately move the opposing first and second pallets into engagement with the escapement sleeve as the escapement sleeve advances axially in an actuating direction.

The application discloses a glass micro-matrix mold forming and compensation processing method based on air pressure dynamic balance, and belongs to the field of precise optical element manufacturing, and comprises the following steps: S1, forming a mold cavity structure suitable for a glass micro-matrix by processing a mold unit cell according to a preset process; S2, establishing a gas expansion pressure balance model, designing pressure cycle parameters, adding a glass blank into the mold cavity, performing a pressurization and pressure release cycle based on the parameters calculated by the gas expansion pressure balance model and the pressure cycle parameters, controlling glass shrinkage / expansion auxiliary exhaust by using a temperature gradient, and filling the mold cavity with the glass until the glass is completely filled in the mold cavity; and S3, constructing an air pressure-deformation coupling compensation model, calculating a compensation amount of each unit cell, converting the compensation amount into a grinding head feeding amount, and finally completing the processing of the glass micro-matrix element according to the grinding head feeding amount. The mold processing, dynamic mold pressing and compensation correction steps can be adapted to existing precise forming equipment, a production line does not need to be massively transformed, and industrialization cost is reduced.

The invention discloses a gas storage pressure design method and device based on heat-fluid-solid coupling simulation, computer equipment and a computer readable storage medium, and relates to the technical field of underground energy storage.The method comprises the steps that experimental data of a target gas storage are collected, a mechanical initial model is constructed, and parameters are initialized; establishing a heat-fluid-solid coupling model by combining a compressed air convective heat transfer process and mechanical behaviors; using injection-production historical data reverse verification and parameter inversion to set an operation pressure constraint criterion, executing multi-cycle pressure cycle simulation based on the verified model, and determining an optimal injection-production pressure through a parameter scanning or optimization algorithm; and post-processing a simulation result, outputting a designed life period operation pressure envelope diagram, and obtaining a safety pressure window of each stage. According to the method, the heat-fluid-solid coupling effect under multi-period injection and production is quantified, the critical pressure is dynamically determined, and the optimal balance of safety and economical efficiency of the gas storage is achieved.

The utility model provides a high and low temperature pressure cycle test system, which relates to the technical field of high and low temperature pressure cycle tests, and comprises an environmental box and a liquid storage box, the environmental box is provided with an accommodating cavity for accommodating a tested container, and the temperature in the accommodating cavity can be adjusted; the liquid storage tank is used for storing a medium; a liquid inlet pipeline and a liquid return pipeline are arranged between the liquid storage tank and the tested container; a high-pressure pump, a first high-pressure heat exchanger and a first one-way valve which are sequentially communicated are arranged on the liquid inlet pipeline in the liquid inlet direction, a liquid inlet of the high-pressure pump is communicated with the liquid storage tank, and a liquid outlet of the first one-way valve is communicated with the tested container; the first high-pressure heat exchanger is further connected with a first cooling and heating all-in-one machine, and the first cooling and heating all-in-one machine is used for heating or cooling media in the first high-pressure heat exchanger. According to the utility model, a pressure cycle test under medium temperature control and high and low temperature environments can be carried out on the tested container, and the performance of the tested container can be evaluated more comprehensively.

The invention relates to the technical field of burn nursing, and particularly discloses a multifunctional burn nursing electric applicator which comprises the following steps: acquiring historical negative pressure data of the nursing electric applicator, carrying out negative pressure time-frequency verification by calculating a gel blocking coefficient, carrying out negative pressure period verification by calculating a variable coefficient of a negative pressure wave crest sequence, and calculating a gel blocking coefficient; whether gelatinous embolism exists or not is judged, a negative pressure plug removal set is obtained through elimination feasibility analysis of negative pressure on gel yield stress and screening, an initial thickness negative pressure set is determined by dividing an eschar thickness set and taking drainage efficiency and edema depth as indexes, the negative pressure plug removal set and the initial thickness negative pressure set are taken to be intersected, and a target thickness negative pressure set is determined. Embolism removal and eschar adaptation are both considered, and the treatment stability and safety of equipment are improved.

The invention relates to a reliability device for testing an optical microphone by simulating oil pressure and a testing method, and belongs to the technical field of optical sensor testing. The device mainly comprises a test box, an oil conservator, an air pressure system, a pressure control system and an ultrasonic signal generation system. The test box is pressurized through the blast pump and the oil conservator, and oil pressure environments at different depths in the transformer are accurately simulated by using a plurality of pressure release valves with different pressure thresholds. According to the invention, not only can the sensitivity and the minimum sensing amount of the optical microphone under different static oil pressures be tested, but also fatigue life evaluation can be carried out through controllable pressure circulation. The device has the advantages that the oil pressure control is accurate, the range is wide, the safety is high, the functions of vacuum simulation, ultrasonic excitation and the like are integrated, and a key test means is provided for model selection, point distribution and reliability evaluation of the optical microphone in the oil-immersed transformer.

The invention discloses a method for inducing controllable collapse of an interlayer in a construction process of an ultra-deep salt cavern reservoir, which mainly comprises the following steps of: early-stage preparation and parameter design: completing exposure of a target interlayer, and obtaining mechanical parameters of the target interlayer through geological data and logging data; based on this, the peak value, valley value, rate and dwell time of the pressure cycle are designed. And fatigue load application: strictly executing designed pressure circulation through a wellhead pumping and flowback system. The rapid pressure reduction stage is the key of inducing crack propagation. Monitoring and feedback control: utilizing sonar to measure the cavity, and tracking the interlayer state and the collapse process. And adjusting cycle parameters according to a monitoring result to realize closed-loop control. According to the method, the damage of the interlayer is converted from passive waiting to active induction, the whole process is carried out under artificially set parameters, and the controllability is high.

This invention provides a method and system for feature extraction of strain measurement data from long-term service tank pressure cycling tests, comprising: Step 1: Introducing a Long Short-Term Memory (LSTM) module into the encoder structure of an autoencoder network model to capture long-distance feature correlations in long-cycle pressure cycling tests; Step 2: Introducing a gated recurrent unit into the decoder structure of the autoencoder network model to optimize the temporal signal reconstruction effect; Step 3: Training multiple autoencoder models to establish an important feature extraction network for tank pressure cycling strain observation data based on the autoencoder model; Step 4: Integrating variance filtering and mutual information maximization methods to construct a multi-layer, multi-criteria feature screening model; Step 5: Performing single-dimensional time-domain and frequency-domain feature extraction on the strain measurement data from the tank pressure cycling test, and inputting the preprocessed data into the important feature extraction network and the multi-layer, multi-criteria feature screening model to achieve key feature extraction of the test data.

This invention relates to the field of solid-state refrigeration materials with pressure-sensitive effects, and discloses a technical method for improving the adiabatic temperature change decay of plastic crystal materials under constant pressure cycling conditions. The method involves uniformly mixing ammonium iodide plastic crystal grains with silicone oil to form a coating composite system with lubricating and isolating functions. A spherical shell encapsulation structure is then fabricated using PA12 nylon powder via laser sintering 3D printing. The composite system is filled and sealed within the spherical shell to form a stable encapsulation unit. During programmed pressurization and depressurization cycles of the encapsulation unit under constant pressure conditions, the silicone oil effectively reduces inter-grain friction and stress concentration, while the spherical shell structure prevents the loss of the coating medium and maintains the integrity of the system, thereby significantly suppressing the decay of the adiabatic temperature change of the plastic crystal material with increasing cycle count.

The invention discloses an anti-fatigue high-pressure hydrogen storage container inner container for a hydrogen refueling station and a manufacturing method of the anti-fatigue high-pressure hydrogen storage container inner container, and belongs to the technical field of high-pressure gas storage. In order to solve the problem that an existing IV type hydrogen storage container inner container causes early fatigue failure due to the stress-hydrogen coupling effect, the inner container with the continuous gradient functional structure is provided, the material components, the pore structure and the macroscopic modulus of the wall of the inner container are in collaborative continuous gradient change from the inner surface to the outer surface, and therefore the stress distribution is optimized, and meanwhile the stress distribution is optimized. And infiltrated hydrogen atoms are actively guided to diffuse to a low-stress region, so that the initiation of hydrogen-induced fatigue cracks is inhibited from the source. The manufacturing method comprises the steps of digital reverse design based on phase field simulation and machine learning, multi-material additive manufacturing adopting dynamic slurry mixing and gray exposure and programmed post-processing. The pressure cycle life of the hydrogen storage container can be remarkably prolonged, and the transient safety and the structural reliability of the hydrogen storage container are improved.

The invention relates to the technical field of cylindrical lithium battery manufacturing, and particularly discloses a method for improving permeation after liquid injection of a cylindrical lithium battery, which comprises the following steps: processing a cylindrical lithium battery shell opening by a channeling tool to form a specific bevel angle and an R angle; the coating mechanism forms an oleophobic coating on the inner side of the shell opening; performing negative pressure leak detection on the lithium battery in a middle negative pressure environment; after the electrolyte is injected, transferring into an injection pressurizing cavity for pressure maintaining; positive and negative pressure circulation treatment is alternately performed for three times, and electrolyte is deeply permeated; and exhausting after two times of low-medium negative pressure treatment, and recovering normal pressure to finish pressure maintaining. According to the method, the oblique angle, the R angle and the micro-nano texture processing are carried out on the cylindrical lithium battery shell opening, and a nano-scale super-oleophobic coating technology is combined, so that the attachment and the residue of the electrolyte at the shell opening are inhibited. And the problems of equipment pollution, material corrosion, poor welding in subsequent procedures and the like caused by overflow of the electrolyte are effectively reduced, so that the rework rate and the rejection rate in the production process are reduced.

This document discloses a method for dissolving a polymer resin, the method comprising: treating the polymer resin or a composite material containing the polymer resin with a first mixture of fluids for one or more pressure cycles; wherein the first mixture comprises a first superheated fluid and a first supercritical fluid; wherein each pressure cycle comprises a pressurization step, a pressure holding step, and a depressurization step; and treating the polymer resin or the composite material containing the polymer resin with a second mixture of fluids for one or more pressure cycles; wherein the second mixture of fluids comprises superheated water, a second superheated or supercritical fluid, and a third supercritical fluid; wherein the first superheated fluid and the second superheated or supercritical fluid contain fluids having a pressure between 15 MPa and... 1 / 2 With 40 (MPa) 1 / 2 The solvent between the Hildebrand solubility parameter and the solubility parameter.

The utility model provides a novel high-precision self-operated regulating valve which is characterized in that an air inlet channel of a director is in a slender taper hole shape, the aperture is thick outside and thin inside, an air inlet screw is arranged at the tail end of the air inlet channel, a valve front channel is communicated with an air inlet of the director through a pipeline, a valve rear channel is communicated with the lower end of a valve membrane through a pipeline, and an air outlet of the director is communicated with the upper end of the valve membrane. After the regulating valve is designed, the pressure is accurately controlled within a specified pressure range. By reducing the volume of the air inlet, the pressure loss in front of the valve is reduced, the small change of a pressure signal is amplified and fed back to pressure circulation in time, the adjusting sensitivity of the self-operated adjusting valve is improved, and the control precision of pressure adjustment is optimized.

The invention provides a method for modular efficient assembly of a bionic collagen membrane with D period characteristics based on an LB technology. The method comprises the following main process steps: S1, preparing a collagen solution for LB membrane preparation; s2, preparing a substrate LB film; s3, standing and micro-amplitude pressure circulation are carried out; and S4, modularly assembling the collagen membrane. According to the method, on the premise of not changing a collagen formula and mild environmental conditions, two key process steps of continuously standing after balanced mould pressing and forming a'compression-relaxation 'effect with micro-amplitude pressure circulation are introduced, so that the spreading and rearrangement sufficiency of interface molecules is improved, residual interface stress is released, and the collagen quality is improved. Therefore, the structural integrity and the preparation stability of the membrane layer are remarkably improved, the collagen membrane which has higher membrane forming yield and D-period success rate and keeps biological activity is obtained, the stability of the collagen membrane with the D-period characteristic assembled on the basis of an LB technical path is promoted to step from a sample level to a process level, and a reliable manufacturing basis is provided for subsequent application and amplification.

A degassing device removes air dissolved in liquid under a pressure decreased atmosphere. The degassing device includes a liquid tank, a pressure decreasing device, a circulation flow pass, and a control device. The liquid tank stores the liquid. The pressure decreasing device decreases pressure in the liquid tank. The circulation flow pass communicates different positions of the liquid tank. The circulation device circulates the liquid through the circulation flow pass. The control device drives the circulation device at least one of timing before driving the pressure decreasing device and timing before releasing the pressure decreased liquid tank to the atmosphere.

The application discloses a carbon fiber reinforced light high-pressure-resistant hydrogen storage tank and a preparation method thereof, and belongs to the technical field of high-pressure light hydrogen storage tanks, and aims to solve the technical problem that the lightness, air tightness and pressure cycle performance of the light high-pressure-resistant hydrogen storage tank in the prior art need to be further improved. The carbon fiber reinforced light high-pressure-resistant hydrogen storage tank comprises a barrier layer, a pressure-resistant layer and a protective layer arranged in sequence from inside to outside. The barrier layer comprises the following components in parts by weight: HDPE 70-80 parts, HDPE-g-MAH 15-18 parts, barrier filler 7-8 parts and additive 1-2 parts. The epoxy modified hollow microbeads, the epoxy modified poly-p-phenylene terephthalaldehyde and the modified carbon fiber are used to reinforce the epoxy resin, and then are matched with the barrier layer, so that the compatibility between the barrier layer and the pressure-resistant layer is improved, the density of the material is reduced, and the air tightness, the compressive strength and the normal temperature pressure cycle performance of the material are improved.

The invention provides a compression-injection type heat pump, and belongs to the technical field of refrigeration and heat pumps. The system mainly comprises a compressor, a heat supply device, an ejector, a condenser, a throttle valve and an evaporator, the compressor is communicated with a high-pressure steam inlet of the ejector through a high-pressure cycle working medium channel via a heat supplier, the evaporator is communicated with a low-pressure steam inlet of the ejector through a low-pressure cycle working medium channel, the ejector is communicated with the compressor and the condenser through a medium-pressure cycle working medium channel, and the condenser is communicated with the evaporator through a cycle working medium channel via a throttle valve. The heat supply device is communicated with the outside through a heated medium channel, the condenser is communicated with the outside through a cooling medium channel, the evaporator is communicated with the outside through a refrigerated medium channel, and the compression-jet type heat pump is formed.

The application discloses a type III hydrogen cylinder full-surface pressure cycle test system and method, and relates to the technical field of nondestructive testing and safety evaluation of high-pressure hydrogen storage cylinders. The system can realize in-situ, online and accurate monitoring of early damage of the full surface of the cylinder during the pressure cycle process, and has high detection precision and high automation level. The system comprises a primary protection cabin, a flexible force and sound sensing module, a signal acquisition module, a pressure loading module, a data processing and control module and a display and control module. The pressure loading module can cyclically load the cylinder and acquire pressure values in real time. The flexible force and sound sensing module is used for acquiring broadband force and sound signals generated by internal damage of the cylinder. The data processing and control module can extract damage features and quantitatively determine the damage. The display and control module can regulate and control pressure extreme values and cycle periods, realize closed-loop control of the detection process and visual display of detection information. The application also discloses a test method based on the system.

The utility model belongs to the technical field of airwave pressure circulation therapeutic apparatuses, and particularly relates to an airwave pressure circulation therapeutic apparatus with a suspension type structure, which comprises a main machine shell, a display screen arranged on the surface of the main machine shell, a handle connected to the top of the main machine shell, an interface arranged on one side of the main machine shell, and a power supply connected to the interface. The utility model relates to a hospital bed therapeutic apparatus, which comprises a main machine shell, a pressing plate and an L-shaped hanging frame, one side of the main machine shell is provided with a knob, the back of the main machine shell is provided with a mounting plate, and the surface of the mounting plate is connected with the L-shaped hanging frame, through an elastic structure between the pressing plate and the L-shaped hanging frame, when the therapeutic apparatus needs to be hung on a hospital bed guardrail through the L-shaped hanging frame, the therapeutic apparatus can be hung on the L-shaped hanging frame. The connecting block is pulled through the handle to enable the connecting rod to drive the pressing plate at one end to extrude the spring, then the therapeutic apparatus is hung on the guardrail through the L-shaped hanging frame, then the handle is loosened, the pressing plate can reset under the action of the spring at the moment, the guardrail is clamped, and the stability of hanging the guardrail by the therapeutic apparatus is improved.

The invention belongs to the technical field of printed circuit board manufacturing, and discloses a method for controlling flowing PP (polypropylene) glue overflow in high-speed rigid-flex board manufacturing, which comprises the following steps of: in low-pressure heating, continuously monitoring the displacement of a pressure head of hot-pressing equipment, and calculating the displacement rate and the displacement acceleration; taking the moment when the displacement acceleration reaches the negative peak value as the lowest point of the resin viscosity, and executing transient pressure circulation to remove micro-voids; according to the method disclosed by the invention, the mechanical response of the hot-pressing equipment is used as a closed-loop control basis of a process node, and the method does not depend on externally set temperature or time parameters any more; the high-pressure application time is directly bound with a physical phase change point of resin from completion of microscopic infiltration to start of curing, so that the two mutually restricted targets of microscopic filling and excessive glue inhibition are converted into a successive continuous process in a process time sequence.

The utility model discloses a wearable airwave pressure circulation treatment device, which comprises a wrapping sleeve and a sweat-absorbing film, two groups of secondary magic tapes II are symmetrically arranged on the inner wall of the wrapping sleeve, a plurality of vent holes are formed in the surface of the sweat-absorbing film, two groups of primary magic tapes II are symmetrically arranged on one side surface of the sweat-absorbing film, and a plurality of secondary magic tapes II are symmetrically arranged on the other side surface of the sweat-absorbing film. A plurality of first son hook-and-loop fasteners are arranged on the surface of the wrapping sleeve, a clamping ring is arranged at one end of the surface of the wrapping sleeve, a first mother hook-and-loop fastener is arranged at the other end of the surface of the wrapping sleeve, a ventilation inner cavity is formed in the wrapping sleeve in a surrounding mode, and a plurality of compression air bags are arranged on the inner wall of the wrapping sleeve. The wrapping sleeve is arranged on the leg or the hand in a sleeving mode, one end of the first mother hook-and-loop fastener penetrates through the clamping ring and adheres to the first son hook-and-loop fastener to be bound and fixed, the air pump is controlled through the externally-connected control device, air is conveyed into the ventilation inner cavity and the compression air bag through the air inlet pipe and the connecting pipe, and treatment is conducted. And hot air generated by long-time wrapping can be exhausted through the ventilation pipeline and the ventilation holes.

This invention discloses a hydrogen storage cylinder with anti-inner liner buckling, relating to the field of hydrogen storage technology. It includes an inner liner, a fiber-wound layer, a valve seat, and an end plug. The inner liner has grooves at both ends, with a venting cylinder at the center of each groove. The valve seat includes an insert and an interface; the insert is embedded in the groove, and the interface connects to the insert. The end plug is threaded to the interface. The fiber-wound layer is wound from one valve seat through the inner liner to another. A lubricant layer is applied to the outer side of the valve seat to reduce friction, allowing relative sliding between the valve seat and the fiber-wound layer during pressure cycling. The insert has a conical surface for flaring the port of the fiber-wound layer. Compared to existing technologies, this invention enables the automatic release of hydrogen gas accumulated between the inner liner and the fiber-wound layer, thereby preventing the inner liner from buckling.