4 results about "Pressure monitoring" patented technology

The invention discloses a comprehensive control method for rockburst in a multiple-coalbed mining mine. According to the method, rockburst is controlled by employing two-side blasting for pressure relief, pressure-relief chamber establishment and coalbed high-pressure water injection according to monitoring data. The source of the monitoring data comprises electromagnet radiation monitoring, drilling-cutting-method pulverized coal monitoring, mine pressure monitoring and micro-seismic monitoring system monitoring. Two-side blasting for pressure relief means that during tunneling of upper gangway and lower gangway of a working face, following closely the tunneled working face, deep-hole pressure-relief blasting is arranged to the lower side of the upper gangway and the upper side and the slower side of the lower gangway. Pressure-relief chamber establishment means that the pressure-relief chambers are disposed on the lower side of the upper gangway and the upper side and the lower side of the lower gangway every 40 meters during tunneling. The coalbed high-pressure water injection means that advance water injection accompanied by coalbed high-pressure water injection is carried out on the upper sides and the lower sides of the gangways and in the pressure-relief chambers for rockburst control. According to the method of the invention, multiple methods are used for comprehensive forecasting, so that the rockburst control level is improved, the loss caused by rockburst is effectively reduces, and thus the pertinence and the effectiveness of the rockburst control are substantially enhanced.

The invention discloses a cardiac surgery myocardial cardiopelgia synchronous perfusion and pressure monitoring and adjusting device. The device comprises two perfusion branches, a liquid supply pipe,a shunt detection meter and a second infusion pipe, the two perfusion branches are rotationally arranged on the shunt detection meter; an elastic telescopic pipe and a dial plate provided with a pointer and scales are arranged in the shunting detection meter; a first infusion pipe is arranged in the infusion head on each infusion branch, one end of the second infusion pipe is in butt joint with the first infusion tube, the other end of the second infusion pipe is connected to a third infusion pipe in the shunt detection meter, one end of the elastic telescopic pipe is connected to the secondinfusion pipe, and the other end of the elastic telescopic pipe is closed and extends to the free end of the pointer. The device is simple in structure and convenient to use, synchronous and uniform perfusion of coronary artery on two sides can be realized, coronary artery blockage can be detected in the perfusion process, the device is self-inspected to find out whether a pipeline of the device is blocked or not, whether the device performs uniform perfusion or not is effectively found out in time, and insufficient perfusion and excess perfusion are avoided.

The invention discloses a municipal fuel gas flow pressure monitoring system, belongs to the technical field of gas monitoring. The system comprises a flowmeter and an anti-explosion heat preservationbox, the upper part of the right side wall of the flowmeter is connected with a temperature change sensor through threads, the left end of the rear side wall of the inner cavity of the anti-explosionheat preservation box is fixedly provided with a three-valve set through bolts, the upper portion of the three-valve set is connected with a differential pressure transmitter through threads, the right side of the lower part of the three-valve set is connected with a pressure transmitter through threads, a flow accumulating instrument is fixedly arranged on the upper portion of the rear side wallof the inner cavity of the anti-explosion heat preservation box through bolts, and the lower portion of the rear side wall of the inner cavity of the anti-explosion heat preservation box is fixedly provided with a storage battery set through bolts. According to the municipal fuel gas flow pressure monitoring system, the design is reasonable, the practicability is high, the differential pressure transmitter and the pressure transmitter are additionally arranged on the pipeline and used for compensating the temperature and the pressure, the measurement precision is improved, and the influence on monitoring caused by environmental changes is avoided.

The invention discloses a sulfur hexafluoride decomposition product gas pressure monitoring device based on gas in-situ detection. The device comprises a gas circuit part, a detection part and a power supply part; the gas circuit part comprises a gas supplementing pipeline, a gas using pipeline, a testing pipeline, a reference pressure inflation valve, a reference pressure locking valve and a reference pressure cavity; the detection part comprises a differential pressure sensor, a differential pressure display meter, a pressure sensor and a reference pressure display meter; and the power supply part supplies power to the detection part. In a transformer substation field environment with violent temperature and humidity changes, the pressure of SF6 gas components can be continuously monitored for a long time under the condition that the operation state of SF6 gas insulation equipment is not interfered, so that a corresponding test basis is provided for perfecting an SF6 decomposition theory and a chemical diagnosis technology of electrical equipment.