31 results about "Pressure cycle" patented technology

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 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 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 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 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.

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 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 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.

Embodiments of a setting tool, system, and method are disclosed herein. In one embodiment, a setting tool for use downhole in a wellbore comprises a piston chamber configured to be coupled with an activation chamber of a downhole tool; and a resettable piston positioned in the piston chamber. The piston chamber comprises at least a first portion having an area A adjacent to the activation chamber, and a second portion having an area larger than the first portion. A first pressure amount P applied from the surface of the wellbore into the second portion translates the resettable piston toward the activation chamber to increase pressure in the first portion by an amount larger than P.

The invention provides an alternating water pressure test method for a water meter with a plastic shell, and belongs to the technical field of water meter testing. The problem that in the prior art, a fatigue resistance test of a plastic shell water meter is not accurate and effective enough is solved. The alternating water pressure test method for the water meter with the plastic shell comprises the following steps: step A, setting working parameters; a low-pressure pump and a high-pressure pump are controlled to alternately work to supply water to a water meter unit, the low-pressure pump works at a set working frequency to enable a water meter to bear low-pressure target pressure, the high-pressure pump is in a starting state before the dwell time of low pressure ends, and high pressure is switched after low pressure ends; the high-pressure pump works to enable the water meter unit to bear high-pressure target pressure and keep the set pressure maintaining time, and circulation is conducted in sequence; and C, stopping working after the number of cycles reaches the set number of high-low pressure cycles. According to the invention, the water meter with the plastic shell is closer to the actual use condition, so that the test accuracy and effectiveness are improved.

The application provides a new type of high-precision self-operated regulating valve, the air inlet channel of a commander is in the shape of an elongated conical hole, the hole diameter is large at the outside and small at the inside, the end of the air inlet channel is provided with an air inlet screw, the front channel of the valve is connected to the air inlet of the commander through a pipeline, the rear channel of the valve is connected to the lower end of the valve film through a pipeline, the air outlet of the commander is connected to the upper end of the valve film, and the pressure after the regulating valve is designed to be accurately controlled within a specified pressure range. By reducing the volume of the air inlet hole, the pressure loss before the valve is reduced, the small change of the pressure signal is amplified, timely feedback is given to the pressure circulation, the regulating sensitivity of the self-operated regulating valve is improved, and the control precision of pressure regulation is optimized.

The utility model relates to a kind of hydrogen storage and supply device, system, the device includes storage pipeline and the first storage tank and second storage tank connected therewith, and power device and adjusting device. The first storage tank stores water, it has gas storage mode and gas supply mode. Under gas storage mode, the hydrogen gas of hydrogen production equipment is received and stored by the first storage tank, and water is transferred to the second storage tank. Under gas supply mode, the water of second storage tank is transferred to the first storage tank by power device to discharge hydrogen gas for gas supply. Adjusting device is used to adjust the flow or exhaust volume of hydrogen gas received by the first storage tank. The gas storage and gas supply process of the system does not need to use expensive hydrogen compressor, and is safer, lower power consumption. And by setting adjusting device, the flow or exhaust volume of hydrogen gas received by the first storage tank can be adjusted, so that the pressure of each storage tank and the entire system can be kept constant, the hydrogen pressure of pipe network is stable, and the pressure cycle fluctuation is reduced.

The invention provides a compression-injection type heat pump, and belongs to the technical field of refrigeration and heat pumps. The ejector is communicated with the compressor through a medium-pressure cycle working medium channel, the compressor is divided into two paths through a high-pressure cycle working medium channel, the first path is communicated with the heat supplier, the second path is communicated with a high-pressure steam inlet of the ejector, and the heat supplier is communicated with the evaporator through a cycle working medium channel and a throttling valve. The evaporator communicates with a low-pressure steam inlet of the ejector through a low-pressure cycle working medium channel; the heat supply device communicates with the outside through a heated medium channel, the evaporator communicates with the outside through a low-temperature heat medium channel, and the compression-injection type heat pump is formed.

This invention belongs to the field of printed circuit board manufacturing technology and discloses a method for controlling the flowability of PP glue overflow in the manufacturing of high-speed rigid-flex boards. The method includes the following steps: during low-pressure heating, the displacement of the pressure head of the hot press equipment is continuously monitored, and the displacement rate and displacement acceleration are calculated; the moment when the displacement acceleration reaches a negative peak value is taken as the point of lowest resin viscosity, and transient pressure cycling is performed to remove microscopic voids; then the moment when the displacement rate crosses zero is taken as the resin gelation inflection point, triggering high pressure application until curing is completed. This invention uses the mechanical response of the hot press equipment itself as the basis for closed-loop control of process nodes, no longer relying on externally set temperature or time parameters, and directly binds the timing of high pressure application with the physical phase change point of the resin from the completion of microscopic wetting to the start of curing. Thus, in terms of process timing, the two mutually restrictive goals of microscopic filling and glue overflow suppression are transformed into a continuous process that occurs sequentially.

Fuel cell system (3), comprising: a fuel cell (20); an on / off valve (46) which is configured to be able to reduce the pressure of a fuel gas, wherein the on / off valve (46) regulates a quantity state of the fuel gas supplied to the fuel cell (20); a fuel gas supply channel (42) with a first channel (42C) extending between the fuel cell (20) and the on / off valve (46), and a second channel extending from the on / off valve (46) via a shut-off valve (44) to a fuel gas supply source (41); a first pressure sensor (P1) that detects the pressure of the fuel gas in the first channel (42C); has a second pressure sensor (P3, P4) that detects the pressure of the fuel gas in the second channel; a circulation channel (43) that returns fuel exhaust gas that has been discharged from the fuel cell (20) to the first channel (42C); a drain valve (72) for draining a liquid from the circulation channel (43) in the circulation channel (43); and a controller (60) connected to the on / off valve (46), the shut-off valve (44), the first pressure sensor (P1) and the drain valve (72), characterized in that the fuel cell system (3) further comprises a gas outlet mechanism (49) that releases the fuel gas in the first channel (42C) from the first channel (42C) when the pressure of the fuel gas in the first channel (42C) exceeds a threshold value, wherein: If a pressure value detected by the first pressure sensor (P1) is abnormal, the controller (60) closes the shut-off valve (44) and the drain valve (72); and Then, if the pressure value detected by the first pressure sensor (P1) has decreased, the controller (60) determines that the on / off valve (46) has failed, whereas if the pressure value detected by the first pressure sensor (P1) has not decreased, the controller (60) determines that the first pressure sensor (P1) has failed, wherein: the controller (60) stops the power generation of the fuel cell (20) after it has closed the shut-off valve (44) and before it determines whether the pressure value detected by the first pressure sensor (P1) has decreased; the controller (60), after closing the shut-off valve (44), causes the second pressure sensor (P3, P4) to monitor a pressure reduction in the second channel; and, As a result of the monitoring, if a pressure reduction is observed in the second channel, the controller (60) determines whether the pressure value detected by the first pressure sensor (P1) has decreased, whereas if a pressure reduction is not observed in the second channel, the controller (60) determines that the first pressure sensor (P1) has failed.

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.

The utility model relates to medical instrument detection technical field and disclose a kind of implantable pacemaker pressure cycle tester, including bottom plate and the fixed installation of test jar in bottom plate and with the controller of test jar electric connection, the side of test jar close to bottom plate is provided with drain pipe and penetrates, the test jar is fixedly installed with limit component at outer wall close, the test jar is fixedly installed with extension plate at the other end away from bottom plate, the other end away from bottom plate of the test jar is provided with the top cover compatible with limit component. The implantable pacemaker pressure cycle tester, by the cooperation of limit block two, cushion block and drag hook, when test piece is placed in the inside of test jar, limit block two can be rotated by drag hook, then make cushion block and limit block two spin into the inside of threaded rod, then cushion block can be extruded top cover, then limit block two and top cover can be locked, can avoid pressure relief when carrying out pressure test.

A system for extracting dissolvable material from a solute is disclosed herein. The system includes a container removably holding a solute and a solvent, a pressure regulator controlling a pressure within the container, and a controller communicatively coupled to the pressure regulator and configured to send pressure cycling instructions to the pressure regulator to enact at least one pressure cycle within the container. Each pressure cycle includes a pressurization period to a target pressure level and a depressurization period from the target pressure level to a resting pressure level less than the target pressure level. Also disclosed herein is a controller for extracting dissolvable material from a solute removably held within a container and a method for extracting dissolvable material from a solute.