81results about How to "Eliminate pressure fluctuations" patented technology

A paint circulating system is suitable for providing paint to applicators in a product finishing facility. The system includes a pump for pumping paint around the system and a back-pressure regulator (BPR), which substantially eliminates pressure fluctuations of paint in the system upstream of the BPR. Control means are provided for controlling the pump and the BPR to operate in one of a flow mode, wherein a required flow rate of paint around the system is maintained, and a pressure mode, wherein a pressure of paint between the pump and the BPR is maintained. The paint circulating method includes switching operation of the pump and the BPR between the flow mode and the pressure mode.

A method for ascertaining a correction value for monitoring a fluid bearing of a coordinate measuring machine or other machine tool. Also disclosed is a coordinate measuring machine having at least one fluid bearing. The machine further includes a first element and a second element which are supported against each other by means of at least one fluid bearing. In addition, a control device is provided for controlling the machine. A quantity representing a pressure in the at least one fluid bearing is ascertained as a function of a position and/or orientation of the first element relative to the second element. A correction value for a pressure in the at least one fluid bearing is determined for the position and/or orientation of the first element relative to the second element. The correction value is then stored in the control device, and subsequently used for machining or measuring a workpiece.

Embodiments of the present invention relate to a pressure damping ink filter for use with an ink jet printer. The pressure damping ink filter includes at least one flow control member and a filter. The flow control member, in combination with any pressure damping provided by the thickness of the filter medium and the ink volume capacity of the filter housing, may substantially reduce, if not eliminate, pressure fluctuations in the ink stream that are generated by a high frequency electric pump. The flow control member may be a fixed or variable input restrictor and a fixed or variable output restrictor. The input restrictor and/or output restrictor may also be located inside or outside of the filter housing. Further, the input and output restrictors may be molded as part of the filter housing or the filter itself.

An extended term resuscitation system includes a plurality of inflatable cuffs adapted to extend around separate portions of the anatomy of a patient (i.e. the chest, abdomen and legs) for enhancing the circulation when inflated/deflated periodically. A primary low-pressure-high-volume air compressor is in fluid communication with each of the cuffs through individual air handlers. The air handlers are formed with an inflation and a deflation diaphragm valve which, under the control of an electronic timer and a pneumatic circuit, connect the respective cuff to the output of the compressor for inflation or to the atmosphere for deflation. A secondary air compressor provides air under suitable pressure to the pneumatic circuit for the control of the diaphragm valves. As an option the operator may change the cyclical rate and cuff pressure. A ventilator provides oxygen to the patient in selected volumes or on demand.

The invention discloses a load-sensitive rotation buffer valve and a crane rotation hydraulic system. A middle path of a rotation reversing valve is sequentially connected with a guide oil port of a three-way pressure compensation valve and an oil inlet of a constant flow valve through an LS feedback oil path, an oil inlet of the three-way pressure compensation valve is communicated with an oil inlet of a valve body, an oil outlet of the three-way pressure compensation valve is communicated with an oil returning opening of the valve body, an oil outlet of the constant flow valve is divided into two paths, one path is directly connected with the oil returning opening of the valve body, the other path is communicated with an oil inlet of a first one-way valve and an oil inlet of a second one-way valve at the same time, a speed adjusting valve is formed by the three-way pressure compensation valve and the rotation reversing valve, flow adjustment of a work oil port A and a work oil port B is achieved, flow is output proportionally, influences of the load are avoided, in the whole operation process, action is stable, fast and slow action is avoided, stable opening is achieved, during stopping, pressure impact is small, and a crane cannot rotate and swing.

A vertical dynamic cyclone separator for removing sand from thick oil and separating the oil-displacing polymer from the recovered liquid by gravitation and centrifugal is composed of a frequency-variable motor, a vertical cyclone separator with a rotary drum driven by said motor, and a settling tank for collecting the separated heavy phase.

The present invention is aimed to reduce a possibility that clean space at the so-called door being opened in the FIMS system is polluted. In order to achieve the object concerned, as a driving mechanism for driving a load port door in the FIMS system, mechanisms different in driving speed are used between during the early stage of driving and any other state than it. Particularly, during the early stage of driving, it is made possible to drive the door at exceedingly low speed, and after the door is opened by a predetermined amount, the door will be driven at high speed that has been usually controlled.

The invention relates to a duplex overflow weir which is suitable for a segmental downcomer in a plate column. The duplex overflow weir comprises weir plates, open pores, a vapor-liquid channel and an air duct, wherein the weir plates are divided into two or more than two layers and arranged according to a certainty gradient from bottom to top. The structure can distribute and divert the liquid to enter the downcomer, increase the space utilization ratio of the downcomer, avoid forming air pockets, promote vapor-liquid separation and the processing capacity of the downcomer is increased by 10-20%. The weir plates can form a plurality of weirs at different heights, the liquid level heights on the plates can be automatically adjusted according to the liquid quantity, and the design flexibility can be enhanced by 10-15%. The lower edges of the weir plates are irregular, and the fluid can laterally flow along the height difference in the downcomer, thereby facilitating gas escape. The liquid flow distribution on the column plates can be adjusted to relieve a retention region and back mixing and improve the vapor-liquid contact, thereby the mass transfer efficiency is enhanced by 5-15%. The open pores in the weir plates can discharge part of liquid flows to relieve the eddying tendency; and the air duct can lead the entrained air out to relieve the pressure fluctuation. The invention is suitable for high liquid quantity operations.

The invention provides an apparatus for rapidly gasifying liquid nitrogen through circulating water bath, and an operating method thereof. The apparatus comprises a pressure cryogenic liquid tank C1, a boost gasifier C2, a circulating water bath liquid nitrogen gasifier C3, a water cooling tower circulating water collecting pool C4 and a control valve C18; the bottom of the pressure cryogenic liquid tank C1 is connected with the circulating water bath liquid nitrogen gasifier C3 through the control valveC18, liquid nitrogen from the pressure cryogenic liquid tank C1 is heated by flowing circulating water and gasifies, the gasified liquid nitrogen enters a nitrogen pipe network system C5, and the flowing circulating water is from the water cooling tower circulating water collecting pool C4. The apparatus can realize the emergent rapid demands of a nitrogen system, can complete preset operation within 1-2min, gasifies liquid nitrogen to form nitrogen, and sends nitrogen to the nitrogen pipe network, and the liquid tank with a proper volume is selected according to production process requirements to maintain a liquid nitrogen emergency gasifying device within a certain time in order to win precious time to deal with unexpected accidents.

The invention relates to a method and a device for actively suppressing pressure oscillations or pressure pulsations in a hydraulic system of a cold- or warm-rolling train or a strip conditioning installation for iron, steel or aluminum materials. The aim of the invention is to provide a method and a device for actively suppressing pressure oscillations or pressure pulsations in a hydraulic system of a cold- or warm-rolling train or a strip conditioning installation whereby occurring pressure oscillations or pressure pulsations can be suppressed in a particularly effective manner by means of a simple and cost-effective device. This aim is achieved by a method comprising the following method steps: a) detecting a pressure signal by means of a pressure sensor through permanent pressure measurement in the hydraulic system; b) determining an alternating component of the pressure signal; c) determining in real time at least one variable which changes over time with the aid of a controller while taking at least one nominal value and the alternating component into consideration; d) subjecting at least one actuator to the variable, wherein the actuator changes a volume that corresponds with the variable and is in connection to the hydraulic system, thereby suppressing the pressure oscillations in the hydraulic system.

The invention relates to an elastic high pressure common rail device with variable high pressure volume for an engine high pressure common rail fuel system. The device provided by the invention comprises a high pressure common rail and an elastic seal cavity which is additionally arranged in the high pressure common rail, wherein the cavity is made from a material with the bulk modulus coefficient less than 1500 N/mm<2> and can be easy to compress, the cavity is processed into a saw tooth shape, the cavity is filled with seal fuel oil. On the one hand, when an engine needs the high pressure common rail fuel system to spray systemic circulation oil mass, the pressure of the high pressure fuel oil in the high pressure common rail is greater than the pressure in the elastic seal cavity, the volume of the elastic seal cavity is decreased due to extrusion, and the effective oil supply volume of the corresponding high pressure common rail is increased. On the other hand, when the engine is in a state of medium-low speed and medium-low load, the oil pressure in the high pressure common rail is reduced, the elastic seal cavity expands due to the interior high pressure effect, the effective oil supply volume of the high pressure common rail is decreased, and finally the high pressure common rail inner volume changes along with the oil-rail pressure.

The invention relates to a distributed heat supply network energy storage pressure stabilizing system. Booster pumps (4) are installed on the inlet sides of hot-water boilers (2) and a heat supply network heat exchanger (3), and heat supply network circulating pumps (5) are installed on the outlet sides of the hot-water boilers (2) and the heat supply network heat exchanger (3); a heat supply network dirt remover (8) is installed on the inlet sides of the booster pumps (4); water outlet pipes of heat supply network water supplementing pumps (6) are connected to an inlet pipeline of the heat supply network dirt remover (8); and multiple air pressure energy storage tanks (1) are distributed in different areas of a heat supply network pipeline, and the air bag pressure of the air pressure energy storage tanks (1) is the same as the pressure of water return pipelines at the connecting positions. According to the distributed heat supply network energy storage pressure stabilizing system, heat supply network water return pipeline pressure fluctuation caused by local water loss of a heat supply network can be quickly compensated, the accident that the hot-water boilers are vaporized or heat supply network circulating pump inlets are vaporized due to the fact that the pressure of the water return pipelines is too low is successfully avoided, and the good effect on ensuring running safety of a network source is achieved.

The invention discloses a non-negative-pressure secondary water supply system provided with an assistant air pressure water tank for high-position adjustment. The non-negative-pressure secondary water supply system is mainly composed of a flow stabilization compensation tank, a negative pressure eliminator, a liquid control transmitter, a water pump, the air pressure water tank, a flow detecting device, a control cabinet and a water using point; the flow stabilization compensation tank is a vertical closed pressure-bearing container, the liquid control transmitter is arranged in the flow stabilization compensation tank so as to be used for monitoring the water level, and the water outlet of the flow stabilization compensation tank is connected with the water pump; and a water outlet pipe is connected to the water using point through the water outlet of the water pump for water supplying, and the air pressure water tank is installed at the highest position, and is a device capable of conducting water amount storage, adjustment and pressure water supply through compressibility of air in the tank. The non-negative-pressure secondary water supply system has the beneficial effects that the assistant air pressure water tank is arranged at the highest position of the non-negative-pressure secondary water supply system for water supply, and the small flow energy saving and investment saving water supply effects are achieved; in addition, pressure fluctuations in the water pump switching process can be effectively eliminated; and the effect on buffering a water hammer is achieved.

The invention discloses a pressure control device for continuous circulating drilling. The pressure control device for continuous circulating drilling comprises a body, a through hole for allowing a drill rod to penetrate through is formed in the middle of the body, four rams are further installed in the through hole of the body, each ram is formed by splicing two half rams of the symmetrical structure, and each half ram is driven by a hydraulic cylinder. The four rams comprise the blind ram, the slip ram, the bearing ram and the pipe ram sequentially from top to bottom, wherein the blind ram, the bearing ram and the pipe ram are arranged in parallel, and the slip ram and the bearing ram are crossed by 90 degrees. The pressure control device can reduce pressure fluctuation of a wellhead when single-joint unit or three-joint unit connection and disconnection circulation stops or starts, keep the pressure of the wellhead stable, and can ensure that the formed well wall does not collapse to the greatest extent, drilling accidents are greatly reduced, and the risks of circulation loss, stratum cracking, well kick, pressure differential sticking, and jamming of a drill bit or bottom drill combination are greatly reduced.

The invention discloses a high-pressure direct-injection natural gas engine gas inlet pressure stabilizing device based on the variable coherent wavelength. The device comprises a natural gas pressureadjusting unit, a temperature sensor, a buffer tank, a buffer tank stop valve, a 1/4 wavelength pipe assembly, a pressure sensor, a second high-pressure natural gas pipeline and a 1/4 wavelength pipeeffective length adjusting device. The first high-pressure natural gas pipeline is sequentially provided with the natural gas pressure adjusting unit, the temperature sensor, the second high-pressurenatural gas pipeline, the 1/4 wavelength pipe assembly and the pressure sensor. One end of the second high-pressure natural gas pipeline is connected with a side opening of the first high-pressure natural gas pipeline, and the other end of the second high-pressure natural gas pipeline is connected with the buffer tank. The buffer tank stop valve is arranged on the second high-pressure natural gaspipeline. Multiple 1/4 wavelength pipes are arranged in the 1/4 wavelength pipe assembly, and each 1/4 wavelength pipe is connected with the side opening of the first high-pressure natural gas pipeline. The length of each 1/4 wavelength pipe connected into the first high-pressure natural gas pipeline is controlled through the 1/4 wavelength pipe effective length adjusting device.

A crankcase scavenged two-stroke internal combustion engine (1) having an additional air supply (2) arranged to its transfer ducts (3), connecting a crankcase volume (4) and a transfer port (5). There is at least one recess (6, 24) in a piston (7) arranged below a piston ring (10, 11), and further there is a flow channel (12; 13; 14) arranged in the piston or in a cylinder wall (29) of the engine cylinder (9), and the recess is arranged to register with the transfer port and the flow channel for certain first piston positions, i.e. to create a communication between the transfer port/s and the crankcase volume.

The invention discloses a liquid phase adsorption separation system, and belongs to the technical field of adsorption separation. The liquid phase adsorption separation system comprises a liquid phaseadsorption separation circulating tower, liquid phase adsorption separation circulating bed layer pipelines, a pumping circulating pipeline, variable frequency circulating pumps and a pressure controller, wherein the bottom end of the liquid phase adsorption separation circulating tower is connected with one end of the variable frequency circulating pump through a pipeline, the other end of the variable frequency circulating pump is connected with the top end of the liquid phase adsorption separation circulating tower through the pumping circulating pipeline, a pumping circulating pipeline damper is arranged on the pumping circulating pipeline, the liquid phase adsorption separation circulating tower bed layer pipeline is arranged between each bed layer of the liquid phase adsorption separation circulating tower and the pumping circulating pipeline, and a viscous damper is arranged on the liquid phase adsorption separation circulating tower bed layer pipeline. The system can reduce the energy consumption of liquid phase adsorption separation system equipment, reduce pipeline vibration, eliminate pipeline stress, reduce the pressure difference between the front portion and the rearportion of a regulating valve, increase the flexibility of load regulation and the like.

The invention provides a refining method of argon gas and a refining device requiring high purity argon gas with high yield rate. In argon gas refining operation in a pressure swing adsorption way, even when waste gas quantity varies, pressure of the gas can be lowered as possible. The pressure swing adsorption method is processed via an absorption tower (20A-20C) filled with absorption agent and a circulation containing absorption procedure and an adverse current pressure-reduction procedure; in the absorption procedure, the absorption tower is at a high pressure state and when mixed gas is introduced into the absorption tower, impurities in the mixed gas can be absorbed on the absorption agent, so gas enriched with argon gas can be lead out via the absorption tower; in the adverse current pressure-reduction procedure, the absorption tower is pressure-reduced, so impurities can be desorbed from the absorption agent and gas can be led out of the absorption tower; with the above method, gas led our of the absorption tower in the adverse current pressure-reduction procedure can be introduced into a gas storer (3) with various capacity; and the pressure of the gas storer (3) can be fixed and gas in the storer (3) can be discharged.

The invention relates to an equal-displacement constant pressure control method and an equal-displacement constant pressure valve. The valve comprises a valve body, wherein a hollow part of the valve body forms a valve rod channel; a valve rod is movably arranged in the valve rod channel in a penetrating manner; two sealing devices capable of sealing the valve rod channel are arranged on the valve rod; a closed space interval is formed between the two sealing devices and can seal a fluid outlet; two branch inlets are formed in a length direction of the valve rod in the side wall of the valve body, and communicated with an inlet flow channel; and the branch inlets and a fluid inlet are positioned in two sides of the fluid outlet respectively. According to the invention, during a displacement process of the valve rod of the valve, a fluid which is compressed to one side can be supplemented to the other side for releasing the space, so that the total volume of the fluid is not changed in the space of the valve flow channel; the pressure of a closed system is maintained to be constant during a switching process of the valve, and the pressure fluctuation during the switching process of the general valve is eliminated; and the equal-displacement constant pressure control method and the equal-displacement constant pressure valve are suitable for switch control of the closed system in which the volume of the fluid is small.