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452results about How to "Prevent overpressure" patented technology

Method for maintaining and/or restoring viability of organs

An organ perfusion apparatus and method monitor, sustain and / or restore viability of organs and preserve organs for storage and / or transport. The method includes perfusing the organ at hypothermic and / or normothermic temperatures, preferably after hypothermic organ flushing for organ transport and / or storage. The method can be practiced with prior or subsequent static or perfusion hypothermic exposure of the organ. Organ viability is restored by restoring high energy nucleotide (e.g., ATP) levels by perfusing the organ with a medical fluid, such as an oxygenated cross-linked hemoglobin-based bicarbonate medical fluid, at normothermic temperatures. In perfusion, organ perfusion pressure is preferably controlled in response to a sensor disposed in an end of tubing placed in the organ, by a pneumatically pressurized medical fluid reservoir, providing perfusion pressure fine tuning, overpressurization prevention and emergency flow cut-off. In the hypothermic mode, the organ is perfused with a medical fluid, preferably a simple crystalloid solution containing antioxidants, intermittently or in slow continuous flow. The medical fluid may be fed into the organ from an intermediary tank having a low pressure head to avoid organ overpressurization. Preventing overpressurization prevents or reduces damage to vascular endothelial lining and to organ tissue in general. Viability of the organ may be automatically monitored, preferably by monitoring characteristics of the medical fluid perfusate. The perfusion process can be automatically controlled using a control program.
Owner:LIFELINE SCI

Non-invasive Thermal Dispersion Flow Meter with Chronometric Monitor for Fluid Leak Detection and Freeze Burst Prevention

ActiveUS20140348205A1Conservation promotedCost promotedThermometer detailsVolume/mass flow measurementPropagation timeEngineering
A non-invasive thermal dispersion flow meter with chronometric monitor for fluid leak detection includes a heater, an ambient temperature sensor and a flow rate sensor which are configured to sense the temperature of a fluid in a conduit, and then monitor the flow of that fluid through the conduit. The fluid flow sensor is incorporated into a Wheatstone bridge circuit which is used to provide increased sensitivity to the outputs of the sensors. Based upon the ambient temperature sensor readings, the flow rate sensor and heater may be adjusted to optimize the operation of the system to detect leaks. An alternative embodiment utilizes a single sensor and separate heater which work together to determine heat propagation times which in turn is used to calculate flow rate. Based on the sensor readings, the flow may be adjusted to prevent damage and leaks by relieving the system of excess pressure.
Owner:SENTINEL HYDROSOLUTIONS

Apparatus and method for maintaining and/or restoring viability of organs

InactiveUS20110183310A1Prevent overpressureEliminating overpressurization prevents and/orBioreactor/fermenter combinationsBiological substance pretreatmentsAutomatic controlOrgan Viability
An organ perfusion apparatus and method monitor, sustain and / or restore viability of organs and preserve organs for storage and / or transport. Other apparatus include an organ transporter, an organ cassette and an organ diagnostic device. The method includes perfusing the organ at hypothermic and / or normothermic temperatures, preferably after hypothermic organ flushing for organ transport and / or storage. The method can be practiced with prior or subsequent static or perfusion hypothermic exposure of the organ. Organ viability is restored by restoring high energy nucleotide (e.g., ATP) levels by perfusing the organ with a medical fluid, such as an oxygenated cross-linked hemoglobin-based bicarbonate medical fluid, at normothermic temperatures. In perfusion, organ perfusion pressure is preferably controlled in response to a sensor disposed in an end of tubing placed in the organ, by a pneumatically pressurized medical fluid reservoir, providing perfusion pressure fine tuning, overpressurization prevention and emergency flow cut-off. In the hypothermic mode, the organ is perfused with a medical fluid, preferably a simple crystalloid solution containing antioxidants, intermittently or in slow continuous flow. The medical fluid may be fed into the organ from an intermediary tank having a low pressure head to avoid organ overpressurization. Preventing overpressurization prevents or reduces damage to vascular endothelial lining and to organ tissue in general. Viability of the organ may be automatically monitored, preferably by monitoring characteristics of the medical fluid perfusate. The perfusion process can be automatically controlled using a control program.
Owner:LIFELINE SCI

Non-invasive Thermal Dispersion Flow Meter with Fluid Leak Detection And Alert

ActiveUS20140306828A1Conservation promotedCost promotedFluid-tightness measurementService pipe systemsNon invasiveEngineering
A non-invasive thermal dispersion flow meter with chronometric monitor for fluid leak detection includes a heater, an ambient temperature sensor and a flow rate sensor which are configured to sense the temperature of a fluid in a conduit, and then monitor the flow of that fluid through the conduit. The fluid flow sensor is incorporated into a Wheatstone bridge circuit which is used to provide increased sensitivity to the outputs of the sensors. Based upon the ambient temperature sensor readings, the flow rate sensor and heater may be adjusted to optimize the operation of the system to detect leaks. An alternative embodiment utilizes a single sensor and separate heater which work together to determine heat propagation times which in turn is used to calculate flow rate. Based on the sensor readings, the flow may be adjusted to prevent damage and leaks by relieving the system of excess pressure.
Owner:SENTINEL HYDROSOLUTIONS

Narrow amplitude satellite type flexographic plate printing machine

The invention relates to a narrow amplitude satellite type flexographic plate printing machine which is characterized in that linear guide rails are adopted for ink transfer motion of an anilox roller and movement of a printing plate roller drum, the operation is lightweight and the printing precision is high; by setting an operation mechanism which can read data of a dial indicator for indicating the position of the printing plate roller drum, the technical difficulty in operation is reduced; the anilox roller is connected with a motor through a clutch, thereby avoiding the frequent cleaning problem in a workshop of the anilox roller; by using a back bucket type double-doctor ink supply device, the structure of an ink supply mechanism is greatly simplified, and the cost is greatly reduced; a central stamping roller drum is equipped with a water circulation cooling constant temperature system, thereby ensuring the printing quality; an ultraviolet drying device is provided with a power conversion energy-saving control circuit, thereby saving electrical energy; and an infrared drying device, a printing film covering device and a printing synchronous circular die-cutting device are arranged on the back side of the ultraviolet drying device after the last color of a printing group, thereby further saving the electrical energy, realizing synchronous multiple functions in one machine and reducing the cost. The narrow amplitude satellite type flexographic plate printing machine is applicable to water-based ink printing, and can avoid polluting commodities and causing harm to health of people, and is environment-friendly.
Owner:上海环野机械有限公司

Inverter protection circuit and protection method and device

The invention discloses an inverter protection circuit. The circuit is used for protecting a voltage source inverter in an inverter with direct current fault ride-through capability, wherein the inverter is composed of a diode valve group or a current source type valve group unit and a voltage source type valve group unit, and the diode valve group or the current source type valve group unit and the voltage source type valve group unit are connected in series. A bypass thyristor valve group is connected in parallel with both ends of the inverter with direct current fault ride-through capability. The anode and the cathode of the bypass thyristor valve group are connected with the positive pole and the negative pole of the inverter with direct current fault ride-through capability respectively. The invention further discloses an inverter protection method. When the voltage source inverter detects that an alternating current or direct current system is failed and the voltage or current ofthe voltage source inverter exceeds a threshold value, the bypass thyristor valve group is input, and fault information is transmitted to a rectifier station. The rectifier station reduces the directcurrent voltage and reduces the direct current to zero. The bypass thyristor valve group is turned off due to current zero-crossing. The voltage source inverter protection circuit effectively solvesovervoltage and overcurrent problems caused by direct current charging of the voltage source inverter, and ensures the reliable operation of the voltage source inverter.
Owner:NR ELECTRIC CO LTD +1

Apparatus and method for maintaining and/or restoring viability of organs

InactiveUS8323954B2Prevent overpressureEliminating overpressurization prevents and/orBioreactor/fermenter combinationsBiological substance pretreatmentsAutomatic controlOrgan Viability
An organ perfusion apparatus and method monitor, sustain and / or restore viability of organs and preserve organs for storage and / or transport. Other apparatus include an organ transporter, an organ cassette and an organ diagnostic device. The method includes perfusing the organ at hypothermic and / or normothermic temperatures, preferably after hypothermic organ flushing for organ transport and / or storage. The method can be practiced with prior or subsequent static or perfusion hypothermic exposure of the organ. Organ viability is restored by restoring high energy nucleotide (e.g., ATP) levels by perfusing the organ with a medical fluid, such as an oxygenated cross-linked hemoglobin-based bicarbonate medical fluid, at normothermic temperatures. In perfusion, organ perfusion pressure is preferably controlled in response to a sensor disposed in an end of tubing placed in the organ, by a pneumatically pressurized medical fluid reservoir, providing perfusion pressure fine tuning, overpressurization prevention and emergency flow cut-off. In the hypothermic mode, the organ is perfused with a medical fluid, preferably a simple crystalloid solution containing antioxidants, intermittently or in slow continuous flow. The medical fluid may be fed into the organ from an intermediary tank having a low pressure head to avoid organ overpressurization. Preventing overpressurization prevents or reduces damage to vascular endothelial lining and to organ tissue in general. Viability of the organ may be automatically monitored, preferably by monitoring characteristics of the medical fluid perfusate. The perfusion process can be automatically controlled using a control program.
Owner:LIFELINE SCI

Current limit control method and current limit control device of three-level inverter

The invention discloses a current limit control method and a current limit control device of a three-level inverter. The current limit control device comprises a current limit control unit, an auxiliary switching tube switch-on unit and a main switching tube switch-on unit. The current limit control method includes: S1, when currents outputted by a bridge leg are larger than or equal to a current limit threshold value, switching off two main switching tubes and then switching off two auxiliary switching tubes; S2, when the currents outputted by the bridge leg are decreased to be smaller than the current limit threshold value, enabling the two auxiliary switching tubes to act according to normal switching logic; S3, when the currents outputted by the bridge leg are decreased to be smaller than the current limit threshold value and effective edges of PWM (pulse-width modulation) signals of the main switching tubes or auxiliary switching tubes are reached, enabling the two main switching tubes to act according to the normal switching logic. By the current limit control method and the current limit control device, time for mutual energy infusion and mutual charging of positive and negative buses is shortened, overvoltage of the unilateral bus is avoided, frequent actions of the main switching tubes are avoided, the switching tubes are protected, and output voltage waveforms are improved.
Owner:EMERSON NETWORK POWER CO LTD

Detection system for beam control circuit of phased array radar antenna, and implementation method for detection system

The invention discloses a detection system for a beam control circuit of a phased array radar antenna, and an implementation method for the detection system, and mainly solves problems in the prior art that the testing is tedious, the detection cost is increased and the detection efficiency is low. The system comprises an upper computer, an FPGA chip connected with the upper computer, an interfacecontrol module which is disposed in the upper computer, a test control module which is connected with the interface control module, a command analysis module which is connected with the test controlmodule, a command generation module which is connected with the command analysis module, and a serial port communication module connected with the FPGA chip. The test control module comprises a DA read-write module, a channel amplitude and phase control module, a system self-check module, a beam control algorithm verification module, a power pulse control module, a beam control circuit flash memory control module, and an attenuation amplitude control module, wherein the DA read-write module, the channel amplitude and phase control module, the system self-check module, the beam control algorithm verification module, the power pulse control module, the beam control circuit flash memory control module and the attenuation amplitude control module are connected with the command analysis module,and the serial port communication module is connected with the FPGA chip. The system is simple and convenient to operate, is good in compatibility, is complete in test items, and is high in test efficiency.
Owner:成都锐芯盛通电子科技有限公司

Overall process under-balance drilling pressure compensation system and method

InactiveCN101929331APressure balanceEnsure safe implementationFlushingSealing/packingHigh pressureBlowout preventer
The invention relates to an overall process under-balance drilling pressure compensation system and a method for oil and gas drilling, an underground casing valve (10) is connected on a superior casing string, a wellhead rotary blowout preventer (11) is arranged at an upper end of a wellhead blowout preventer group and is connected with an under-balance throttle manifold (8) through a high-pressure hose (9), a well control manifold (12) which is connected out of a normal wellhead control device by four-pass is connected with a drilling fluid continuous pouring system in parallel by two-pass; and drilling is pulled to the front of the underground casing valve (10), the drilling fluid continuous pouring system grouts, the under-balance throttle manifold (8) controls the pressure in a shaft, and the drilling fluid which is circulated out enters a normal drilling fluid circulating system. In the drilling pulling process, the drilling fluid can be continuously poured into the shaft by a ground pressure compensation system and the bottom-hole pressure can be dynamically controlled simultaneously, thus effectively preventing formation fluid from intruding into the shaft in the drilling pulling process and keeping the steady under-balance state of the shaft.
Owner:中国石油集团西部钻探工程有限公司克拉玛依钻井工艺研究院

High-voltage frequency converter braking deceleration protection system and method

The invention provides a high-voltage frequency converter braking deceleration protection system. A high-voltage frequency converter adopts a power unit serial connection type structure, and comprises a voltage sampling unit, a differential voltage calculation unit and a first self regulating controller, wherein the voltage sampling unit is used for sampling the direct current bus voltage of all power units of the high-voltage frequency converter, the differential voltage calculation unit is used for calculating the variation value of the direct current bus voltage, and the first self regulating controller is used for making the high-voltage frequency converter stop outputting braking voltage to an electric motor when the variation value of the direct current bus voltage exceeds the first threshold. The invention also provides a corresponding method. The deceleration time and/or the output torque upper limit of a speed regulator is automatically regulated according to the variation value of the direct current bus voltage change value of the power unit during the braking operation of the high-voltage frequency converter, the over voltage of the power unit can be avoided without the additional addition of circuits, and the cost of the high-voltage frequency converter is reduced.
Owner:SUZHOU INOVANCE CONTROL TECH CO LTD

Continuous railroad bed compaction quality monitoring and controlling system and working method

The invention relates to a continuous railroad bed compaction quality monitoring and controlling system and a working method. At present, the railroad filling engineering compaction quality is detected and controlled by using a regular dot-mode sampling detection method which is carried out after rolling compaction, namely, detection after working, so as not to realize the real-time control on the overall rolling compaction process. The continuous railroad bed compaction quality monitoring and controlling system comprises a singlechip (1), wherein the singlechip (1) is respectively connected with a ferroelectric memory (2), an A/D (analog-to-digital) converter (3), a color liquid crystal display circuit (4), a global positioning system (GPS) module (5), a general packet radio service (GPRS) module (6), a clock chip (7), an electrically-erasable programmable read-only memory (8), a secure digital (SD) card (9), a universal serial bus (USB) interface circuit (10), a keyboard circuit (11) and a square wave switching circuit (12); the A/D converter is connected with a voltage conversion circuit (13) and a signal processing circuit (14); and the square wave conversion circuit is connected with the signal processing circuit. The continuous railroad bed compaction quality monitoring and controlling system is used for continuous railroad bed compaction quality monitoring and controlling.
Owner:HEILONGJIANG INST OF TECH

Fiber grating sensing-based asphalt pavement compaction monitoring method

The invention discloses a fiber grating sensing-based asphalt pavement compaction monitoring method, relates to the field of compactness quality control in an asphalt pavement construction process, and aims at meeting the requirements of simply and effectively controlling the asphalt pavement compaction times in real time. A fiber grating vertical strain sensor and a temperature sensor are implanted into a lower layer of a monitored asphalt layer; the fiber grating vertical strain sensor and a fiber grating interrogator are in butted connection; an asphalt mixture of the monitored layer is paved; a road roller collects information sent out by the fiber grating vertical strain sensor while grinding; a change curve of a strain response peak of the fiber grating vertical strain sensor along with the grinding times is extracted; a compaction evaluation index SDI is obtained through curve differentiation; when the SDI is close to 0 for successive two times, grinding is stopped; and compaction monitoring of the asphalt pavement is finished. The fiber grating sensing-based asphalt pavement compaction monitoring method is applicable to compaction quality monitoring of other pavements.
Owner:HARBIN INST OF TECH +2

Medium-sized pure electric bus chassis

The invention relates to a medium-sized pure electric bus chassis which comprises a chassis body, a first front wheel, a second front wheel, a first rear wheel, a second rear wheel, a front axle and a rear axle, wherein the first front wheel, the second front wheel, the first rear wheel, the second rear wheel, the front axle and the rear axle are arranged on the chassis body, the front axle is arranged between the first front wheel and the second front wheel, and the rear axle is arranged between the first rear wheel and the second rear wheel. An electric steering system, a power source system, a driving system, a control system and a brake system are arranged on the chassis body. The electric steering system is positioned in the front section of the chassis body, the power source system is positioned in the middle section of the chassis body, the driving system and the control system are positioned in the rear section of the chassis body, and the brake system is distributed on the whole chassis body in a penetrating manner. Electric energy serves as a power source, the power performance and safety of a power system can be ensured when a bus runs, and zero emission, energy conservation and environmental protection can be realized.
Owner:ANHUI ANKAI AUTOMOBILE

Growth reactor for gallium-nitride crystals using ammonia and hydrogen chloride

The present invention in one preferred embodiment discloses a new design of HVPE reactor, which can grow gallium nitride for more than one day without interruption. To avoid clogging in the exhaust system, a second reactor chamber is added after a main reactor where GaN is produced. The second reactor chamber may be configured to enhance ammonium chloride formation, and the powder may be collected efficiently in it. To avoid ammonium chloride formation in the main reactor, the connection between the main reactor and the second reaction chamber can be maintained at elevated temperature. In addition, the second reactor chamber may have two or more exhaust lines. If one exhaust line becomes clogged with powder, the valve for an alternative exhaust line may open and the valve for the clogged line may be closed to avoid overpressuring the system. The quartz-made main reactor may have e.g. a pyrolytic boron nitride liner to collect polycrystalline gallium nitride efficiently. The new HYPE reactor which can grow gallium nitride crystals for more than 1 day may produce enough source material for ammonothermal growth. Single crystalline gallium nitride and polycrystalline gallium nitride from the HYPE reactor may be used as seed crystals and a nutrient for ammonothermal group III-nitride growth.
Owner:SIXPOINT MATERIALS
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