149 results about "Pressure cycle" patented technology

One of the most significant safety concerns in the automation of extracorporeal blood treatments such as dialysis is the risk of blood leakage. Such systems draw blood at such a high rate that a loss of integrity in the blood circuit can be catastrophic. The most reliable leak detection method known is the detection of infiltrated air in the blood line, but this only works in blood lines under negative pressure. According to the invention, a leak detector for return lines is provided by periodically generating a negative pressure, which may be brief or at a 50% duty cycle, in the blood return line to draw air into it and thereby reveal the leaks using an air sensor. Although the return line is ordinarily under positive pressure, during the negative pressure cycle, the blood return line draws air through any leaks or disconnects. If air is detected, the system is shut down and an alarm generated.

The multiple interventionless actuated downhole valve includes a valve movable between an open and a closed position to control communication between an annular region surrounding the valve and an internal bore and more specifically controlling communication between above and below the valve, and at least two remotely operated interventionless actuators in operational connection with the valve, wherein each of the interventionless actuators may be operated independently by absolute tubing pressure, absolute annulus pressure, differential pressure from the tubing to the annulus, differential pressure between the annulus and the tubing, tubing or annulus multiple pressure cycles, pressure pulses, acoustic telemetry, electromagnetic telemetry or other types of wireless telemetry to change the position of the valve and allowing the valve to be continually operated by mechanical apparatus.

A flapper valve preferably used in injection application in deep subterranean locations has an actuating sleeve with a seat to accept an object. A j-slot connects the actuation sleeve movement to the housing so that with an object on the seat and an applied pressure cycle the sleeve moves the flapper to the open position. The plug is dissolved and the injection begins. The plug can have an opening so as to allow continuous injection flow as the flapper is operated. Closing the flapper involves a second object on the same seat and a pressure cycle so that a spring can push the sleeve away from the flapper to allow a torsion spring on the flapper to close it.

An in situ cleaning system is disclosed for use with semiconductor processing equipment. In accordance with an important aspect of the invention, the cleaning system provides for dynamic cleaning of the semiconductor processing system by varying the pressure of the cleaning gas over time during a cleaning cycle. In particular, the cleaning gas is applied to the semiconductor processing system in repeated pressure cycles. Each pressure cycle begins with the pressure of the cleaning gas at P_MIN. The pressure of the cleaning gas is increased to a maximum pressure P_MAX during a fill portion of the pressure cycle and maintained for a dwell time selected to allow the available reactants to generate the desired end products. The pressure in the chamber to be cleaned is then reduced during a vent portion of the pressure cycle to permit venting of the reaction products. As such, each time the chamber to be filled is vented and re-filled, reaction products are removed and new reactants are introduced into the chamber to be cleaned, increasing the effective reaction rate.

This invention provides systems and methods of supplying oxygen-enriched air to an enclosed space or compartment. The systems and methods may distill oxygen from ambient air by a molecular sieve pressure cycle mechanism, such as a pressure swing absorption, may generate oxygen from water using electricity or may use oxygen enriched air produced by membrane filtration. The invention helps people improve their wellness, productivity and comfort, improve performance of mental and/or physical tasks, increase their alertness, quality of life and pleasure, reduce their drowsiness, and aid in curing and preventing disease by increasing the percentage of oxygen in the enclosed space to a beneficial and safe level.

A process for infusing a consumable substance is described. The process includes the steps of placing a desired amount of an infusion material into a chamber at atmospheric pressure, placing a desired amount of consumable substance into said chamber, sealing said chamber from the surrounding atmosphere, and applying at least one reduced pressure cycle within said chamber. Methods for separating the infusion material from the consumable substance after completion of the infusion process are also described. In addition, devices for infusing liquids or consumable substances, and/or brewing beverages are described. The present invention relates to an apparatus for brewing beverages or infusing a consumable substance comprising a vessel, said vessel comprising a sealable chamber for holding a brewing or infusion material and a liquid or consumable substance, and a filter assembly connected to the sealable chamber; a liquid supply and conduit for introducing at least a portion of said liquid supply into said sealable chamber; and a vacuum source and conduit for reducing pressure in said sealable chamber.

Well tools are provided which although pressure responsive, may be maintained by a hydraulic lockout in a nonresponsive condition until a threshold actuation step is performed. This lockout may be achieved by a hydraulic mechanism which controls the rate at which pressure is transmitted to a fluid spring during periods of increased pressure at the pressure source. When the tool is desired to be responsive to pressure cycles, a valve may be opened by established a differential between the pressure in the fluid spring and the pressure source. Communication of pressure in the fluid spring to a movable mandrel will then allow operation of the well tool in response to pressure cycles at the pressure source in accordance with the established design of the well tool.

A hydraulic control system can be used on a downhole choke and has the feature of moving a travel stop for a sliding sleeve using discrete j-slot mechanisms for selectively moving the stop in either one of two opposed directions. The valve can be incrementally opened further with pressure cycling on an opening chamber. The valve can be immediately put to the closed position with pressure on a closing chamber. After closing, the valve can assume its former open position or other selected less open positions by reconfiguring the travel stop while the valve stays in the closed position In order to achieve a higher open percent after closing, one or more pressure cycles must be applied to the open chamber after the valve is reopened to the position it was in before it was closed.

A modular pressure operated actuator can be coupled with a downhole tool to selectively operate it at least once. In the preferred embodiment the module can be mounted adjacent an isolation valve and after a fixed number of on and off pressure cycles allow a spring to push an actuator to operate the valve to an open position. The actuator, in another embodiment, can be reset with a tool run into the module to move the actuator back against a power spring and hold that spring force until the pressure cycling begins again. The preferred application is for a formation isolation ball valve but other valves, such as sliding sleeves, or other types of downhole tools can be actuated with the module that permits a retrofit of a hydraulic operation to a heretofore purely mechanically actuated tool.

A dual area pressure pulmonary modulator apparatus which provides constant flow, pressure cycled ventilatory support to patients that is additionally equipped with fluid conduits in the valve mechanism and body that allow the clinician or user to manually actuate inhalation by occluding a fluid path emanating from the modulator. Such feature is useful for when the device stops cycling due to physiological changes of the patient, for determining if the patient is cycling the device or if the device is automatically cycling by nature of its setting, coordinating medical procedures with the breathing of the patient, increasing the PEEP beyond the intrinsic design PEEP of the device for a given PIP setting, increasing inspiratory hold time, and providing an easy to use alternative mode of operation for users with less sophistication.

The invention discloses a low-temperature pressure cycle life testing method and system. According to a typical embodiment in the invention, a vibration generator and a bellows assembly are respectively used as a power supply and a driving element; a driving part of the bellows assembly is connected with a moving part of the vibration generator through a driving assembly; an enclosed liquid chamber filled with an incompressible low temperature fluid medium and an enclosed gas chamber filled with a compressible low temperature fluid medium are formed by separate cooperation among the bellows assembly, a pressure testing joint pipe, a diaphragm capsule, etc.; and the driving part of the bellows assembly stretches out and draws back under the driving of movement of the moving part of the vibration generator, so a liquid in the liquid chamber extrudes the diaphragm capsule so as to form pressure fluctuation. The system provided by the invention has a simple structure, has low assembling and maintenance cost, is easy to operate and can conveniently adapt to different pressure fluctuation amplitudes and frequencies by adjusting the output displacement and frequency of a vibrating table, thereby guaranteeing high control precision of pressure fluctuation.

The invention discloses a pressure circulation service life testing system and method. According to the typical embodiment, a vibrating platform is provided as a power source, a hydraulic cylinder is provided as a transmission element, a piston is arranged in the hydraulic cylinder, the piston is in transmission connection with a moving component of the vibrating platform through a piston rod, air is filled into a hydraulic cylinder inner cavity located on one side, close to the vibrating platform, of the piston, a hydraulic cylinder inner cavity located on the other side of the piston is communicated with an accumulator liquid cavity, and water is filled into the hydraulic cylinder inner cavity located on the other side of the piston and into the accumulator liquid cavity. The vibrating platform is started, through motion of the moving component of the vibrating platform, water filled into the hydraulic cylinder and the accumulator liquid cavity is made to extrude an accumulator air cavity to form pressure fluctuation. The pressure circulation service life testing system can adapt to different pressure fluctuation amplitudes and frequencies conveniently by adjusting the output displacement and the frequency of the vibrating platform, so that high control precision of the pressure fluctuation is guaranteed, and the system is simple in structure, low in assembly and maintenance cost and easy to operate.

The invention relates to an improvement of wetting method of lithium-ion battery liquid injection, characterized in that negative pressure wetting is negative pressure cycle changed wetting in -0.1MPa to -0.02MPa vacuum. Electrical core absorbs electrolyte wetly, uniformly and quickly because of using cycle changed negative pressure, the battery reaches liquid injection requirement only 12 to 15 minutes when the flexible packaging is 2000 mA, the time of liquid injection wetting is saved about 1/2 compared with the time of original constant negative pressure wetting, and consistency of internal resistance and capacity of battery is improved greatly, the consistency can improve at least about 10 percent compared with the original technology wetting. In addition, the realizing way of changing negative pressure circularly is simple, and need not increase equipment investment basically, and has low use-cost, and is easy to implement.

A downhole valve features a flow port that can be selectively obstructed by a pressure actuated sleeve that is movable in a pin and slot mechanism to rotate while being cycled up and down by application and removal of pressure in a cyclical manner. When the sleeve is cycled to the port closed position, a flapper mounted near its upper end can fall on a seat on the sleeve to allow pressure to be applied to the flapper and sleeve, causing the sleeve to move to a position that will prevent fluid loss from the tubular string into the formation. The Closed flapper allows pressure cycles of the sleeve. A double closure against fluid loss can be affected.

Electrochemical cells modules made up of couples of catalytic multilayer porous electrodes forming the anodes and the cathodes and delimitating external gaseous areas and internal areas containing the electrolyte wherein the pressure modulators, generating two pressure cycles independently synchronized but of opposite phase, act at the inlet and at the outlet of the electrolyte and the multilayer porous electrodes are weeping on the gas side. According to a preferred embodiment the multilayer porous electrodes are hydrophobic and conductive on the gas side, the conductive and catalytic middle layers are hydrophobic and hydrophilic, the non-conductive and non-catalytic layer on the electrolyte side is hydrophilic. Furthermore, the present invention provides the electrochemical process using the above described electrochemical cell according to which the gas is maintained at a pressure P up to 200 bar, the electrolyte pressure is varied stepwise between P+dP and P+dp by generating on the electrolyte positive pressure waves of amplitude dP and dp at the frequency f.

The invention relates to a liquid pump liquid supply multiple air-conditioning unit, which uses the liquid pump liquid supply to process the cold supply of multiple rooms. The invention comprises the indoor machine and the outdoor machine. It is characterized in that: the outdoor machine comprises a low pressure cycle liquid storage, a liquid pump, and a outdoor machine throttle device, while it uses the liquid pump to pressurize the low pressure liquid coolant generated by the outdoor machine to be fed into indoor heat exchangers of indoor machine via the pipeline to supply cold and form the liquid pump liquid supply multiple refrigeration cycle. Compared to present technique, the invention increases the pressure of the coolant at the inlet of electric expansion valve besides the indoor machine heat exchanger and the pressure difference uniformity between two ends of each expansion valve, improve the safety and regulation property of indoor expansion valve and the reflux property of system, and effectively enlarge the application of multiple system.