135results about How to "Pressure monitoring" patented technology

The invention relates to a measurement system capable of spraying urea solution into exhaust flow (9) of combustion engine for selective catalytic reduction and a control method thereof. The measurement system is connected with a urea solution box (1) to taka out urea solution and the measurement system is also connected with a compressed air supplying device (6) wherein the measurement system comprises at least one nozzle (5) for spraying the urea solution into the exhaust flow in aid of compressed air. The measurement system comprises an air valve (7) to adjust the pressure and / or air amount and / or valve starting time of the compressed air supplying device (6) and a sensor for measuring the pressure and / or air amount in the compressed air supplying device (6) is set between the air valve (7) and the nozzle (5).

The invention relates to the field of display technology and particularly relates to a pressure sensing film and a production method thereof. The pressure sensing film comprises a substrate, a color developing layer and a color forming layer which are sequentially overlapped, wherein the surface of the substrate opposite to the surface adjacent to the color developing layer is used for bearing pressure; the color forming layer comprises at least one color forming unit; each color forming unit comprises at least two color sacs; the color sacs have different pressure bearing thresholds and work when the borne pressures reach the pressure bearing thresholds; and the color developing layer shows corresponding colors according to the working conditions of the color sacs, and each color is corresponding to the set pressure value. According to the pressure sensing film provided by the invention, the equipment pressure range is judged according to different colors to realize effective monitoring on the equipment pressure; and the flatness of the equipment is judged according to the uniformity of the test area colors, and a pressure test and a flatness test are combined so that the daily equipment pressure monitoring is more convenient.

The invention relates to an experimental device for evaluating external pressure resisting intensity of an anti-sand sieve tube. The experimental device comprises an autoclave, and the autoclave comprises an autoclave body. The autoclave body is of a tubular structure with the internal diameter larger than the external diameter of the to-be-evaluated anti-sand sieve tube. Openings at the two ends of the autoclave body are detachably connected with a first sealing cover and a second sealing cover respectively, the inner side of the first sealing cover is provided with an installing groove for fixedly embedding one end of the to-be-evaluated anti-sand sieve tube, a sealing pressing cover is fixedly arranged at the other end of the to-be-evaluated anti-sand sieve tube, the outer surface of the to-be-evaluated anti-sand sieve tube is coated with a sealant, and a drainage tube penetrates the middle of the first sealing cover. One end of the drainage tube is located on the inner side of the to-be-evaluated anti-sand sieve tube, and the other end of the drainage tube is located in a liquid receiving tank. The autoclave body is internally connected with a water outlet of a water injection pump through a pipeline, and a water inlet of the water injection pump is connected with a water outlet of a water storage tank through a pipeline. The autoclave body is internally connected with a high-pressure pump through a pipeline. The autoclave body is provided with a pressure release valve communicated with the inside of the autoclave body, and the autoclave body is provided with a pressure meter communicated with the inside of the autoclave body. According to the experimental device, the external pressure resisting intensity of the anti-sand sieve tube can be reflected.

The invention discloses an oil purifier for oil used in an anti-explosion boat. The oil purifier for the oil used in the anti-explosion boat is characterized by comprising a bottom plate and an oil inlet portion, a filtering portion, an oil outlet portion and a control portion, wherein the an oil inlet portion, the filtering portion, the oil outlet portion and the control portion are arranged on the bottom plate. The oil inlet portion is provided with an oil pump which is used as oil power, and an oil inlet end of the oil pump is provided with an oil suction filter for primary filtering; and then the filter portion is sequentially provided with a protection filter, a coalescing separator and a fine filter so as to achieve multiple-layer filtering. By adopting the coalescing separator and combining the principle of comprehensive multiple-layer filtering, the oil purifier for the oil used in the anti-explosion boat is capable of achieving high-efficiency dehydration and meeting demands of fine separation and real-time separation, and has the advantages of being small in size, low in energy consumption, little in vibration, long in service life, easy and convenient to operate and maintain, low in operation cost, good in anti-explosion performance, safe and reliable and high in automatic degree.

The invention provides a process and a device for producing high-oxygen sponge titanium through adding oxygen directly in a smelting process of the sponge titanium. The oxygen content of titanium tetrachloride is controlled to control the oxygen content of the sponge titanium stably. According to requirements for the oxygen content by a titanium alloy, titanium dioxide is not needed to add during a smelting process of the sponge titanium for production of the sponge titanium with satisfactory oxygen content, therefore composition segregation and local defects caused by addition of the titanium dioxide are avoided, the alloy mixing difficulty is reduced simultaneously, uniform components and stable quality of titanium ingots are guaranteed, and performances of titanium alloy materials are improved effectively.

The invention discloses a high-pressure packaging container, and a high-pressure in-situ gas compression packaging and pressure monitoring system. The system comprises the high-pressure packaging container, a high-pressure in-situ gas compression packaging system and a high-pressure in-situ gas monitoring system, wherein the high-pressure in-situ gas compression packaging system can package both a plurality of inert gas pressure transmission media and a plurality gaseous-state samples; the high-pressure in-situ gas monitoring system can precisely calibrate ultrahigh pressure; the high-pressure packaging container is provided with an optics observation window and a high-pressure gas inlet, so that high pressure generated during the packaging process of the gaseous-state samples or the inert gas pressure transmission media can be monitored, the situation that pressure in the high-pressure packaging container is stable and controllable during the packaging process is ensured, and the problems that the packaging of the gaseous-state samples or the inert gas pressure transmission media fails caused by uncontrollable pressure in the high-pressure packaging container and a diamond anvil cell press is damaged are avoided to further increase the success rate of a high-pressure in-situ experiment.

The invention provides a method for online accurate humidity measurement of sulfur hexafluoride gas in a GIS. SF6 gas in the GIS is automatically sampled and measured according to a specific measurement time interval requirement, and a result is transmitted to a monitoring background; when the numerical value of the measured SF6 gas exceeds standards, alarming is conducted in time, and operation and maintenance staff are prompted to find out causes; when humidity testing of the SF6 gas in equipment is qualified, the system can immediately start an inflation pressure pump, an inflation valve is turned on, the GIS equipment is filled with gas in an SF6 gas recycling device, and it is guaranteed that the gas is measured in a flowing state. Devices used in the method include the GIS equipment (1) filled with the SF6 gas, a sulfur hexafluoride gas pressure meter (2), a sulfur hexafluoride gas humidity sensor gas obtaining valve (3), a sulfur hexafluoride gas humidity sensor (4), a sulfur hexafluoride gas humidity online measurement background (5), the sulfur hexafluoride gas recycling device (6), a pressure pump (7) and an adjustable gas supplement valve (8).

The invention provides a polishing disc and a polishing system, and relates to the technical field of optical element precise machining. The interior of the polishing disc is provided with a storing cavity used for storing polishing liquid, the polishing face of the polishing disc is provided with liquid outlets, and the liquid outlets communicate with the storing cavity through channels arrangedin the polishing disc. The polishing liquid is stored in the storing cavity of the polishing disc, when polishing is conducted, the polishing layer of the polishing disc makes close contact with an element, the polishing liquid flows out through the liquid outlets, the effect that the polishing liquid is evenly distributed on the surface of the element in the polishing process is achieved, the condition that the polishing liquid is sprayed again after polishing is stopped multiple times is avoided, and the polishing efficiency is improved. The polishing liquid flows out from the storing cavitythrough the liquid outlets, therefore, the amount and the pressure of the polishing liquid flowing out from the different liquid outlets are approximately equal, and the polishing liquid on the surface of the element can be evenly distributed.

The invention discloses a monitoring system for pressure, temperature and urine flow in the bladder, which comprises a catheter and a central controller; the sensing end of the catheter is provided with a pressure sensor and a temperature sensor, and the other end of the catheter is provided with a urine storage bag , the urine storage bag is provided with a urination controller and a urine flow monitor; the urination controller is provided with a one-way solenoid valve, and sends an opening signal to the one-way solenoid valve, the catheter starts to urinate, and sends After the signal is turned off, the urinary catheter stops urinating; the central controller includes a microcontroller, and the microcontroller is provided with a power module, a liquid crystal display module, and a sound alarm module, and also includes: a wireless communication module, connected to a monitoring terminal to realize Remote monitoring; connect to the local area network to realize remote monitoring in the hospital ward; the wireless communication module sends the received pressure and temperature data in the bladder to the monitoring terminal for comparison with the rated value, and the comparison result is greater than the rated value , send an activation signal to the alarm.

Disclosed are a pressure sensing method based on photonic crystal fibers and a sensor. Light emitted from a light source is coupled to a pressure sensing head through general conducting fibers, wherein the pressure sensing head is manufactured by the photonic crystal fibers. When pressure acts on the pressure sensing head, size and pitch of air holes of the photonic crystal fibers and pressure thereof are varied linearly, the light source transmission light mold field is varied, welding point coupling loss is then varied, and variation of light strength can be detected by a detector, so that pressure measurement is realized. The sensor is simple in structure, small in size, compatible biologically, independent with temperature and insensitive to electromagnetism and radiation, and the like.

The invention discloses a high-voltage circuit breaker device, and the device comprises an insulating housing, a moving conductive rod, a fixed conductive rod, a first vacuum cover, a second vacuum cover and a pressure measurement mechanism. One end of the moving conductive rod and one end of the fixe conductive rod are respectively disposed in the first vacuum cover, and the other ends of the moving and fixed conductive rods respectively extend to the exterior of the first vacuum cover. The interior of the first vacuum cover is also provided with the second vacuum cover, and a side wall of the second vacuum cover is communicated with a glass tube. The glass tube extends to the exterior of the first vacuum cover. The tail end of the glass tube is provided with a pressure measurement mechanism, and the exterior of the first vacuum housing is provided with an insulating housing. The second vacuum housing is connected with a connecting lever, and the connecting lever is connected with a permanent magnet operating mechanism. The permanent magnet operating mechanism is connected with a power supply device, and the power supply device is a hand generator. The device can effectively maintain the high vacuum performance of an arc extinguish chamber, prevents the leakage, saves the cost, is good in flame retardation effect, and facilitates the turn-off of a circuit.

A method for setting a warm placard tire pressure threshold for a motor vehicle tire pressure monitoring system that initiates a learn mode in the tire pressure monitoring system, starts a timer upon determining a vehicle speed is greater than a predetermined speed threshold, stops the timer upon determining the vehicle speed is less than or equal to the predetermined speed threshold or a predetermined period of time has expired, detects a plurality of tire pressures for a tire location while the timer is timing, stores the plurality of tire pressures, averages the plurality of tire pressures to determine a warm placard tire pressure threshold upon the predetermined period of time expiring, and sets the warm placard tire pressure threshold in the tire pressure monitoring system.

The invention discloses a method for visualizing data field corresponding to the coordinate system and utilizes data acquirers in stereoscopic matrix arrangement. The method includes steps of (1) indicating data values of different points by different color; (2) setting the position of each data acquirer as an acquisition point, collecting position information and data values of each data acquirer in a stereoscopic space to establish a stereoscopic coordinate system, and indicating the data value of each point by different color; and (3), calculating the data values corresponding to the coordinates among the acquisition points according to the position information the data values of the acquisition points and indicating the data value of each point by different color, wherein the higher the data values are, the higher the color temperature of the color of the data values is, and the lower the data values are, the lower the color temperature of the color of the data values is. By the aid of the method for visualizing the data field corresponding to the coordinate system, the data values of the integral stereoscopic coordinate system can be acquired integrally, and by means of vivid color, an observer can quickly observe whether points with data values exceeding reasonable range exist or not and acquires distribution conditions of the acquisition points.

The invention provides a mounting pressure test mechanism used for ball grid array (BGA) repair work. The mounting pressure test mechanism used for the BGA repair work comprises a base and a guide rail mounting support, the guide rail mounting support and the base form an integral structure, a synchronous belt and a sliding rail are arranged on the guide rail mounting support, the upper end of the synchronous belt is connected with a stepping motor, and the lower end of the synchronous belt penetrates through a pulley. A printed circuit board (PCB) fixing mechanism is arranged on the base, and a sliding mounting support is perpendicularly arranged on the sliding rail and connected with the synchronous belt. A pressure sensor and a stepping motor controller are arranged on the upper portion of the sliding mounting support. The pressure sensor, the stepping motor controller and the stepping motor are connected through a wire, a BGA welding probe, a pressure detecting bar and a hot wind nozzle are arranged on the lower portion of the sliding mounting support by a connecting rod, the pressure detecting bar penetrates through the sliding mounting support and connected with the pressure sensor on the upper portion of the sliding mounting support, and an elastic element and the hot wind nozzle at the lower end of the pressure detecting bar can be contacted with a packaged BGA element simultaneously. The pressure sensor is utilized to control the stepping motor and avoids oversized or undersized pressure by BGA mounting.

The invention discloses a tire pressure monitoring and alarming device. An air inlet channel communicated with a reference cavity is formed in the bottom of a reference cavity assembly; an outlet section of a bottom nut is provided with an air valve sealing ring for sealing an opening part of an air valve core; an air valve core jack is positioned between the bottom of the reference cavity assembly and the air valve sealing ring; a step at the bottom end of the air valve core jack is inserted into the air valve sealing ring; a main sealing ring is arranged between the top end of the air valve core jack and the reference cavity assembly and corresponds to the lower side of the air inlet channel; the main sealing ring is used for isolating a channel from the inner side of the air valve core jack to the air inlet channel from the outer side of the air valve core jack in a sealing manner; a compressed spring is mounted between the air valve core jack and the reference cavity assembly; the outer wall of the air valve core jack is sealed with the bottom nut through a self-detection sealing ring on the bottom nut, and a space above an elastic conductive sheet is sealed to form an independent monitoring cavity; and the wall face of the air valve core jack is further provided with a lateral air channel; and the lateral air channel is close to the self-detection sealing ring and can move to the upper side of the self-detection sealing ring from the lower side of the self-detection sealing ring to be communicated with the monitoring cavity.

The invention discloses a preparation device of a lithium ion battery anode silicon-carbon composite material, and relates to the technical field of battery manufacturing. The preparation device of the lithium ion battery anode silicon-carbon composite material includes a machine body, the bottom of the machine body is welded with a base, and the top of the machine body is welded with a cylinder.The top of the inner wall of the cylinder is fixedly provided with a driving motor. An output shaft of the driving motor is fixedly connected with the top end of a driving rod through a coupling. Thetop of the machine body is provided with a material groove. The bottom end of the driving rod is fixedly provided with a grinding ball protection mechanism. The preparation device of the lithium-ion battery anode silicon-carbon composite material is operating based on the cooperation of the grinding ball protection mechanism and an attached powder scraping mechanism. The device can effectively reduce the high temperature generated during the working process of a grinding ball. At the same time, the grinding ball protection mechanism eliminates a static charge on the surface of the grinding ball. The simultaneous operation of the attached powder scraping mechanism can form a continuous and intermittent barrier between powder and the grinding ball.

The invention discloses a construction method of pipe-jacking engineering. The construction method comprises the steps that thixotropic slurry for resistance reducing is prepared; grouting holes are arranged, and grouting pipelines are connected; a screw pump is selected as a grouting pump; the surfaces of pipe joints are waxed and are baked by fires, and wax is completely molten into the concretesurfaces of the pipe joints; grouting is carried out on the grouting holes; measuring is carried out in the jacking process; and waterstop arrangement is achieved before pipe-jacking discharging. Thethixotropic slurry is developed by aiming at the formation lithology adopting loess light silt loam, loess medium and heavy silt loam and loess medium silt loam as the main part, and therefore jacking resistance is effectively reduced.

The invention discloses equipment capable of intelligently disassembling and assembling truck tail hook frame layer board bolts. The equipment includes an AGV, a vehicle frame is arranged on the AGV and connected with an assisting arm through a rotary column, the free end of the assisting arm is connected with a motor through a connector, an output shaft of the motor is connected with a nut sleeveused for disassembling and assembling the bolts, and a column power system is connected to the rotary column; the free end of the assisting arm and the connector are also provided with a vision sensing system used for observing the positions of the bolts to be disassembled or assembled; a control system is arranged in the vehicle frame, a control panel is also arranged on the vehicle frame, the input end of the control panel is connected with the vision sensing system, the output end of the control panel is connected with the control system, and the output end of the control system is connected to the column power system. The equipment can achieve precise torque of the bolts and greatly improve the operation environment and the operation efficiency.

The invention discloses tunnel supporting grouting equipment and a grouting method thereof. The tunnel supporting grouting equipment comprises a slurrying device, a water cement ratio measuring and control instrument, a slurry pressing pump, a supporting column, a slurry inlet measuring and control box and a slurry outlet measuring and control box, wherein the water cement ratio measuring and control instrument is located on the slurrying device, the slurry pressing pump is connected with the slurrying device through a conveying pipeline, the supporting column needs to grout, the slurry inlet measuring and control box is installed between the slurry pressing pump and the supporting column, and the slurry outlet measuring and control box is installed on one side of the supporting column. The grouting equipment further comprises a main control machine. The main control machine is used for controlling the slurrying device, the water cement ratio measuring and control instrument, the slurry pressing pump, the slurry inlet measuring and control box and the slurry outlet measuring and control box. The slurry inlet measuring and control box is connected to a grouting hole. The slurry outlet measuring and control box is connected to a slurry outlet hole. The interiors of the slurry inlet measuring and control box and the slurry outlet measuring and control box are each provided with a flow sensor, a pressure sensor and a density sensor. The flow sensors are used for monitoring flow parameters of a slurry liquid in real time. The pressure sensors are used for monitoring pressure parameters of the slurry liquid in real time. The density sensors are used for monitoring density parameters of the slurry liquid in real time.

The invention relates to a cell exosome purification device and method. The purification device comprises a first hollow fiber column and a second hollow fiber column; the two ends of an inner cavityof the first hollow fiber column communicate with a stock solution bottle to form a refined filtration loop; the two ends of an inner cavity of the second hollow fiber column communicate with a transfer bottle to form a concentration loop; an outer cavity of the first hollow fiber column is connected with the transfer bottle through a filtrate pipeline, and the filtrate pipeline is connected witha first manual clamp; a first filter membrane and a first peristaltic pump are sequentially connected to a liquid outlet of the stock solution bottle on the refined filtration loop; and a second peristaltic pump is connected to a liquid outlet of the transfer bottle on the concentration loop. According to the purification device disclosed by the invention, the exosome cell stock solution is filtered by the first hollow fiber column and then concentrated by the second hollow fiber column, so that the purification device is suitable for large-scale continuous automatic sample loading and concentration of a large amount of supernatant, the manual operation time is greatly saved, and the exosome-containing supernatant can be prepared on a large scale; and standardization of exosome preparationis realized.

The invention relates to a sterilization control system and a sterilization control method for a cookware and the cookware. The sterilization control system includes a main control chip, a collectionapparatus, and a vapor generator. The main control chip can send a start command to the vapor generator at a first predetermined time before finishing appointment or heat preservation of the cookware,and send a stop command to the vapor generator when the appointment or heat preservation of the cookware is finished; when the vapor generator receives the start command, high-temperature vapor is fed to a heating chamber in order to regulate the temperature therein; and when the vapor generator receives the stop command, the feeding operation is stopped; the collection apparatus can collect an environment signal in the heating chamber under the high-temperature vapor environment and send the environment signal to the main control chip; the main control chip then regulates operation power ofthe vapor generator by means of the environment signal, thus controlling the temperature of the heating chamber at a sterilization temperature. The system can prevent growth of bacteria due to long time appointment of the cookware at the time of before finishing appointment or heat preservation.

The invention provides a dustproof and antifouling oil cylinder. The dustproof and antifouling oil cylinder comprises a sealing connecting piece, wherein the sealing connecting piece comprises a guidesleeve and an antifouling ring; the antifouling ring comprises a body, a first mounting groove, a lubricating oil accommodating cavity, a lubricating oil injection port and an exhaust overflow port;a dustproof piece is arranged in the first mounting groove; the lubricating oil accommodating cavity is formed between the first mounting groove and the guide sleeve; and an elastic extension piece and a sealing piece are arranged in the lubricating oil accommodating cavity. The oil cylinder has the effects that the overall structure is simple; the dustproof piece is arranged in the first mountinggroove, and a pressure spring and the sealing piece are arranged in the lubricating oil accommodating cavity, thus, it is ensured that back pressure is formed in the lubricating oil accommodating cavity, and the pressure in the lubricating oil accommodating cavity can be preferably stabilized; and as the pressure difference exists, external impurities are difficult to enter the lubricating oil accommodating cavity, and the sealing effect of the oil cylinder is improved.

The invention discloses a primary air opposite-flushing device for preventing a boiler rear wall water cooling wall from slagging and corroding. The device comprises primary air opposite-flushing nozzles arranged on a rear wall of a boiler in a layered manner, and the primary air opposite-flushing nozzles and turbulent combustors arranged on a front wall of the boiler in a layered manner are arranged in a one-to-one opposite manner. The primary air opposite-flushing nozzles and primary air pipes of the turbulent combustors are positioned on the same central axis; and the primary air opposite-flushing nozzles are connected with an opposite-flushing air mother pipe through pipelines with valves. On one hand, the rear wall water cooling wall can be prevented from being scoured by pulverized coal, the problems of slagging and high-temperature corrosion are solved, the primary air speed and the secondary air rotational flow strength of the turbulent combustors on the front wall can be flexibly adjusted by combining the unit load and the fire coal quality, and the adherence atmosphere of the rear wall water cooling wall does not need to be considered; and on the other hand, under the condition that the amount of air entering a hearth is certain, part of air enters the hearth through the primary air opposite-flushing nozzles of the rear wall, the air staged combustion effect can be achieved, and NOx generated by combustion is reduced.

The invention discloses a supercritical multiple thermal fluid generating device capable of being directly used for heavy oil thermal recovery. The supercritical multiple thermal fluid generating device comprises a generator end cover, a mixing barrel and a reactor wall, wherein a water cooling end cover is arranged on the reactor end cover, cooling water is injected to protect the reactor end cover from overtemperature, a cooling water channel is further arranged on the reactor end cover to protect a flame monitor, a nozzle platform is arranged at the bottom of the reactor end cover, is provided with an oxidant spiral nozzle, and is in threaded connection with an atomizing nozzle to ensure that fuel and the oxidant are uniformly mixed, a secondary fuel channel is further arranged in a combustion chamber, crude oil can be directly injected into the combustion chamber, the problems of coking and carbon deposition in the fuel preheating process are solved, water in an annular cooling channel flows downwards to cool the combustion chamber, then enters a cooling and mixing channel and is mixed with reaction fluid flowing out of a mixing barrel outlet hole group, and the temperature control target is achieved. A combustion chamber middle necking structure, a combustion chamber bottom necking structure, the mixing barrel outlet hole group and the like can achieve the purpose of pressure control.

The invention discloses a concentrating photo-thermal electric coupling hydrogen production reaction system based on direct solar gradient utilization. The concentrating photo-thermal electric coupling hydrogen production reaction system based on direct solar gradient utilization comprises a concentrating Fresnel lens, a cross-shaped flange, a photo-thermal catalytic reaction module, a flexible photovoltaic sheet, a proton ceramic steam electrolyzer and the like. The concentrating photo-thermal electric coupling hydrogen production reaction system based on direct solar gradient utilization aims to provide a novel multi-element module coupling hydrogen production method for improving the conversion efficiency from solar energy to hydrogen energy. The working process mainly comprises the steps of solar energy gathering, frequency-division gradient utilization, secondary reflection of transmission light and scattered light, photovoltaic power storage, high-temperature steam electrolysis and the like to achieve all-dimensional ordered utilization of the solar energy. According to the concentrating photo-thermal electric coupling hydrogen production reaction system based on direct solar gradient utilization, parameters such as solar energy radiation quantity, nanofluid mixed liquid temperature and water vapor pressure can be accurately controlled according to specific experimental requirements, and strong coupling of hydrogen production of a photo-thermal coupling module and hydrogen production of an electrolysis module is achieved. The concentrating photo-thermal electric coupling hydrogen production reaction system based on direct solar gradient utilization can be used for providing a reaction place for related research of converting the solar energy into the hydrogen energy through reasonable distribution and graded ordered utilization and the like, and has the advantages of being environmentally friendly, efficient, compact, easy to operate and the like.

The invention provides an automobile engine filter, and belongs to the technical field of automobile spare parts. The filter comprises a shell, a thread is arranged on the outer surface of the upper portion of the wall of the shell, a filter cover is in an inverted-U shape, a thread matched with the thread on the shell is arranged on the inner wall of the filter cover, a left oil inlet and a right oil inlet vertically penetrate the filter cover and are connected with a filter element arranged in the shell, and a plurality of triangular filter units arranged vertically are arranged in the filter element; an oil outlet is formed in the lower portion of the side face of the filter element; and H-shaped protrusions in bilateral symmetry are arranged in the middle of the bottom face of the base. According to the automobile engine filter, impact force to the filter element in the work process of the filter is greatly reduced, and the service life of the filter is prolonged.

The invention discloses a gas ultrasonic flowmeter based on TDC-GP30 and dual-channel and a using method thereof. The using method comprises the steps that: gating two groups of transducers respectively through an electronic switch, then the time chip emits pulses, the echo signal of the ultrasonic flow will return to the time chip and the time chip transmits the calculation result to the microcontroller MCU for storage; the time chip measures the medium temperature of the pipeline in real time, the microcontroller MCU calculates the current temperature, and performs an alarm if the temperature is abnormal or stores the temperature in a data storage chip if the temperature is normal; the microcontroller MCU performs pressure collection on the pressure sensor and calculates a pipeline pressure value, and performs an alarm if the pressure is abnormal or stores the pressure in the data storage chip if the pressure is normal; storing the accumulated flow, the gas volume, the temperature, the pressure, and related instrument parameters calculated by the microcontroller MCU. According to the gas ultrasonic flowmeter based on TDC-GP30 and dual-channel and the using method thereof, the instantaneous flow of the medium in the pipeline is measured by adopting dual-channel transducers, so that the measurement errors caused by the non-uniform distribution of the fluid in the pipeline can be greatly reduced, and the accuracy of the flow measurement can be improved.

The invention discloses a sampling and pressure measuring device for a reaction kettle and relates to the technical field of reaction kettles. The device is characterized in that a connecting pipe of which two ends are provided with flanges is arranged on an opening in the top of the reaction kettle; the connecting pipe is fixedly connected with a sampling pipe through the flange at the upper end; the sampling pipe is coaxially communicated with the connecting pipe; and a pressure gauge is connected in the middle of the connecting pipe. The sampling and pressure measuring device has the beneficial effects that the structure is simple, the sampling is conveniently performed when needed, a sampling port can be conveniently opened and closed, and impurities in air are prevented from being mixed; and moreover, the operation of the reaction kettle is not influenced, the pressure in the reaction kettle is monitored in real time, and the limited space at the upper end of the reaction kettle is saved.

The invention discloses a tunnel secondary lining pre-embedded pressure sensing network structure. The tunnel secondary lining pre-embedded pressure sensing network structure comprises a cylindrical lead box, wherein taking the center of the lead box as a reference point, six leads of equal length are evenly drawn out of the lead box at equal included angles; tail ends of the leads are connected into a regular hexagon through connecting lines; front ends of the six leads are correspondingly connected with six interfaces which are evenly formed in the lead box respectively; three pressure sensors are connected to the six leads at intervals, namely, a pressure sensor is arranged on only one of every two adjacent leads; and a pressure sensor is arranged on only one segment of connecting linein every two adjacent segments of connecting lines on the connecting lines of the regular hexagon. A monitoring device which is matched with and can perform data communication with the cylindrical lead box is inserted into the cylindrical lead box. Meanwhile, the invention also provides a monitoring method using the structure. Pressure points are located accurately by a monitoring network; periodical tunnel health monitoring is realized; and an internal monitoring network is fed back through an external monitoring and receiving device.