1139 results about "Pressure reduction" patented technology

The invention provides a thermodynamic equilibrium simulation analysis method and system, and relates to the technical field of data processing, and the method comprises the steps: 1, building a steam thermodynamic equilibrium model based on the technological parameters of a thermodynamic network; 2, analyzing a thermal distribution state through a steam thermal equilibrium model, identifying an unbalance factor in a process chain, and establishing a four-vertex geometric topological relation among a heat exchanger inlet / outlet, a pressure reduction module and a drain valve process node according to the physical layout of a thermal network; and step 3, based on the dynamic proportion characteristic of the four-vertex geometric topological relation, calculating a thermal correction factor, and adjusting the heat transfer coefficient, the steam pressure and the condensate water temperature parameter of the steam thermal equilibrium model according to the thermal correction factor to obtain the corrected steam thermal equilibrium model parameter. According to the method, through dynamic correction of model parameters and simulation optimization, accurate identification and dynamic regulation and control of thermal unbalance are realized, a closed loop for optimized feedback is formed, and the operation efficiency and stability of a thermal system are improved.

The invention relates to the technical field of material transportation, in particular to a conveying pressure control method and device of a powder and particle pneumatic conveying system. The method comprises the steps that the material humidity, the conveying pressure and the air speed of a frequency conversion fan are obtained; determining a humidity adjusting coefficient; in the pressurization stage, a suppression coefficient is determined according to the current wind speed and the target wind speed; according to the humidity adjustment coefficient and the inhibition coefficient, inhibiting the proportionality item to obtain a target proportionality coefficient; enhancing the differential term in combination with the humidity adjustment coefficient and the pressure deviation to obtain a target differential coefficient; in the pressure reduction stage, the standard humidity is compared with the air speed and the conveying pressure under the material humidity at the current sampling moment and the humidity adjusting coefficient, the integral item is adjusted, and a target integral coefficient is obtained; and adjusting the conveying pressure based on the adjusted PID coefficient. The problem of asymmetry of bidirectional adjustment of pressurization and depressurization can be solved, the adjustment logic is optimized, and the conveying efficiency and stability of pneumatic conveying of powder and particle materials are improved.

A method for starting up vapor-recompression units comprises: providing a vapor recompression sub-system comprising one or more vapor-recompression units, wherein the vapor recompression sub-system has a vapor inlet and a compressed-vapor outlet; providing a means of reducing vapor density through pressure reduction in vapor communication with the vapor recompression sub-system; reducing pressure within the vapor recompression sub-system to reach a sub-system pressure selected from 0.1 kPa to 1000 kPa; introducing a vapor mass flow to the vapor recompression sub-system at a restricted vapor mass flow rate; starting up the vapor recompression sub-system while maintaining the restricted vapor mass flow rate for a start-up time period; and then, following the start-up time period, introducing additional vapor mass flow to the vapor recompression sub-system to reach a full vapor mass flow rate. The restricted vapor mass flow rate is from 0.1% to 90% of the full vapor mass flow rate.

The invention relates to the technical field of desulfurization towers, in particular to an ultrasonic agglomeration dedusting and demisting device of a desulfurization system and an operation method thereof, and aims to solve the problems that in the prior art, fine particles in flue gas are not subjected to agglomeration pretreatment, a targeted cleaning mechanism is lacked, and a demister is easily blocked due to filter residue attachment after long-term operation; and finally, the dedusting and demisting efficiency of the desulfurizing tower is reduced. According to the invention, the ultrasonic generation module is started, parameters are dynamically optimized based on a PLC and a fuzzy PID algorithm to induce agglomeration of PM2.5 and fog drops, the particle size is increased through a depressurization ring, and then efficient gas-liquid separation is carried out through a dual separation mechanism; when filter residues are attached, the motor drives the spray pipe to rotate and spray, the cleaning assembly is matched for wiping, the guide assembly guides waste liquid, the intelligent system adjusts in real time and triggers a cleaning program, a pretreatment and cleaning mechanism is established, blockage is eradicated, stable operation of parts is ensured, and the dust and mist removal efficiency is improved.

The invention discloses a microwave digestion tank with a rapid pressure reduction structure, and relates to the technical field of microwave digestion tanks. The microwave digestion tank with the rapid pressure reduction structure comprises a tank body and a tank cover, a mounting cavity is formed in the tank cover, a through hole is formed in the bottom of the mounting cavity, and an exhaust pipe is fixedly connected to the top of the through hole. According to the microwave digestion tank with the rapid pressure reduction structure, during rapid pressure reduction, when high-pressure gas in the sealing cavity is discharged through the through hole, gas-liquid separation, gas discharge and liquid return into the sealing cavity can be performed through the gas-liquid separation device, so that the liquid in the tank body is prevented from being taken out by gas flow, and the accuracy of a detection result is ensured.

The invention discloses a single-action pressure reduction diaphragm type pressure flow amplifier in the field of industrial flow control. The single-action pressure reduction diaphragm type pressure flow amplifier comprises a machine body, a valve core, a flexible diaphragm, an exhaust assembly, a large pressure reduction device and a small pressure reduction device. An adjusting cavity, an air inlet cavity, an air outlet cavity, an air inlet channel and an air outlet channel are formed in the machine body, the air inlet channel is communicated with the air inlet cavity, the air outlet cavity is communicated with the air outlet channel, the valve core is arranged between the air inlet cavity and the air outlet cavity, the valve core is pushed through the flexible diaphragm and the exhaust assembly, and the compressed air flow and pressure intensity between the air inlet cavity and the air outlet cavity can be adjusted; when the pressure intensity of the adjusted air is relatively low, the small pressure reducing device is used for reducing pressure; and when the pressure intensity is high, the large pressure reducing device is used for reducing pressure. The diaphragm structure design is adopted, the flow and the pressure intensity of compressed air are adjusted through reciprocating motion of the flexible diaphragm, the pressure intensity of the adjusted air is reduced through the two pressure reducing devices, and the diaphragm structure can be better suitable for application scenes where the pressure intensity of the adjusted air is high.

The invention provides a high-pressure cavitation valve which comprises a valve body, a valve core, a valve core, a valve core, a valve core, a valve core, a valve core, a valve core and a valve core, and is characterized in that the valve body is internally provided with a mounting cavity and is provided with a flow inlet channel and a flow outlet channel; the valve cover is arranged at the upper part of the valve body and used for covering the upper side of the mounting cavity; the valve assembly comprises a valve element, a valve rod, a mounting seat, a valve seat and a throttling module, the mounting seat, the throttling module and the valve seat are sequentially arranged from top to bottom, a movable cavity of the valve element is formed in the mounting seat and the throttling module, the valve element is mounted in the movable cavity and used for acting up and down to be matched with the valve seat to open and close the valve, and the valve rod penetrates through the valve cover and then is connected with the valve element; the throttling module at least comprises two round throttling laminations which are arranged in an up-down overlapped mode, a center hole is formed in the center of each throttling lamination in a penetrating mode, a labyrinth flow channel used for reducing pressure and noise of media is formed between every two adjacent throttling laminations, and the labyrinth flow channels are not communicated with one another at the overlapped portions of the throttling laminations. The throttling module in the scheme can effectively play roles of throttling, pressure reduction and the like.

The invention relates to the technical field of auxiliary power systems, in particular to a manufacturing method of an air supply device of an auxiliary power system. The method comprises the steps that a high-pressure air pressure distribution area under the working state of an auxiliary power system air supply device is obtained; determining a positioning surface and a sealing surface of the air supply device of the auxiliary power system according to the distribution area; the assembly tolerance of the auxiliary power system air supply device is determined according to the positioning face and the sealing face; an air inlet channel shell, an air inlet air pocket, an air inlet channel outer ring, an air inlet volute, a labyrinth ring, a locking unit and a rotor are machined according to the assembly tolerance; and an auxiliary power system air supply device is assembled, so that the air inlet channel shell, the air inlet air pocket, the air inlet channel outer ring and the air inlet volute sequentially abut against one another in the axial direction, the labyrinth ring is pressed between the outer side ring face of the outer sealing barrel and the inner side ring face of the volute positioning barrel, and a stepped pressure relief cavity is formed between every two adjacent pressure relief ring gears. Therefore, the problem that the air inlet end shell of the auxiliary power system is very difficult to position and seal well is solved.

The expansion valve comprises a valve body assembly, a pressure reduction module and a noise reduction assembly, the valve body assembly is provided with a valve port, a first side and a second side, the valve port is located between the first side and the second side, and the valve port communicates with the first side and the second side; the pressure reduction module and the silencing assembly are both arranged on the second side, and the pressure reduction module is located between the valve port and the silencing assembly and provided with a flow channel communicating with the valve port and the silencing assembly. The expansion valve has a first working condition, and when the expansion valve is in the first working condition, a working medium flows to the valve port from the first side, is throttled through the valve port and then sequentially flows through the flow channel and the silencing assembly.

The utility model discloses a quick exhaust gas circuit structure which comprises a pneumatic actuator, the pneumatic actuator is connected with a one-way valve, a pneumatic control valve and a shut-off valve, a second electromagnetic valve is arranged on the one-way valve, the one-way valve is connected with a three-way valve, and the three-way valve and the pneumatic control valve are both connected with a first electromagnetic valve and a filtering pressure reducing valve. When the air cylinder needs to be fed with air, the first electromagnetic valve is powered on, the air source passes through the first electromagnetic valve, the air control valve is controlled to be communicated with an air path, and the air source enters the filtering pressure-reducing valve to be subjected to pressure reduction, the first electromagnetic valve and the air control valve are in a closed state, and an interface 1 and an interface 2 in the three-way valve are used for ventilation, so that air cannot be fed at the moment; the first electromagnetic valve is powered on, and the air source passes through the first electromagnetic valve to control the air control valve to be communicated with the air path; an air source enters from the pneumatic control valve, the second electromagnetic valve is not powered on, and the one-way valve cannot flow back. The quick exhaust gas circuit structure is used for a single-action cylinder, realizes emergency opening and closing, and accelerates the exhaust time of the cylinder.

The utility model discloses a pressure regulator with a silencing function, and belongs to the technical field of pressure regulation and stabilization, an internal silencer and an external silencer are additionally arranged on the basis of the structure of an axial-flow type pressure regulator, when a valve cylinder is separated from a valve clack and a valve port seat, gas flows out through a silencing through hole of the internal silencer, and when the gas flow speed is high enough, the gas flow speed is high enough, and the gas flow speed is high enough. The noise reduction through holes can move the frequency spectrum of exhaust noise to high frequency, the audible sound part in the noise frequency spectrum is reduced, and therefore interference of the noise to the environment is reduced, the noise reduction barrel filled with the spring is arranged in the external silencer, when airflow passes through the spring in the noise reduction barrel, the spring in the noise reduction barrel can absorb kinetic energy generated by airflow impact, and the noise reduction effect is improved. When the airflow passes through the rectifying plate at the open end of the external silencer, the airflow passes through the multiple layers of perforated plates, layered diffusion and pressure reduction are achieved, the pressure and the flow speed of the fluid are reduced, meanwhile, the flow direction of the fluid is integrated, impact on the pipe wall is reduced, and the effect of reducing the noise is achieved.

The air pressure type radial artery hemostat comprises a hemostat body which is detachably arranged on the wrist of a patient and provided with a plurality of compression air bags, and the multiple compression air bags are provided with puncture mark points which are arranged in a connected mode so as to be matched with the radial artery puncture position of the patient. The hemostat body is provided with inflation ports communicated with the multiple compression air bags, the inflation ports are communicated with a control air valve through an air pipe, the control air valve has multiple quantitative deflation modes for automatic pressure reduction, and the end, away from the air pipe, of the control air valve is connected with an inflation device. A pressure visible structure is arranged between the control air valve and the air pipe to reflect the hemostasis pressure applied to the wound of the patient by the multiple compression air bags. According to the radial artery compression hemostat, initial pressure applied to a wound of a patient can be visually and quantitatively displayed, the applied pressure can be automatically adjusted according to the compression hemostasis condition of the patient, meanwhile, compared with a traditional radial artery compression hemostat, the manufacturing cost is not remarkably increased, and the use requirements of clinicians are met.

The invention discloses a dynamic permeability testing system and method for hydrate core production by a pressure reduction or heat shock method, and the system comprises a dynamic permeability testing unit (1) which is used for the preparation of a natural gas hydrate core sample and the measurement of permeability; the gas and liquid injection unit (2) is used for injecting required gas and liquid into the dynamic permeability testing system; the hydraulic oil control unit (3) is used for applying axial pressure and confining pressure to the dynamic permeability testing system; the gas-liquid separation metering unit (4) is used for metering the gas-liquid flow at the outlet; and the data acquisition monitoring and control unit (5) is used for monitoring data of each unit and controlling each unit to work. According to the invention, the natural gas hydrate-containing rock core can be subjected to pressure drop under the triaxial stress condition or the production dynamic permeability test by a heat shock method.

The expansion valve comprises a valve body assembly, a pressure reduction module and a noise reduction assembly, the valve body assembly is provided with a valve port, a first side and a second side, and the valve port is located between the first side and the second side and communicates with the first side and the second side; the pressure reduction module is arranged on the first side, the circulation sectional area of the first side at the pressure reduction module is reduced, and the silencing assembly is arranged on the second side; the expansion valve has a first working condition, and when the expansion valve is in the first working condition, the working medium flows from the first side to the second side and sequentially flows through the pressure reduction module, the valve port and the silencing assembly.

The invention provides oxygen cabin equipment and a control system, and relates to the technical field of oxygen cabins, and the oxygen cabin equipment comprises a cabin body which is provided with an observation door; the oxygen cabin main machine device comprises an oxygen generator and a main machine, the oxygen generator is electrically connected with the main machine, and the oxygen generator supplies oxygen to the cabin body through an oxygen inlet valve; the manual safety valve is used for performing manual pressure relief on the cabin body; the automatic constant pressure safety valve is installed in the cabin body, the automatic constant pressure safety valve comprises an automatic pressure detection device and a full-automatic pressure reduction and deflation device, the automatic pressure detection device is used for monitoring the pressure in the cabin body in real time, the full-automatic pressure reduction and deflation device is used for deflating the interior of the cabin body, and the automatic constant pressure safety valve is electrically connected with the host machine. Double safety guarantee is achieved through the manual safety valve and the automatic constant-pressure safety valve. Potential safety hazards caused by the fact that an existing oxygen cabin is not provided with a safety device are effectively avoided, and the safety of the oxygen cabin in the using process is guaranteed.

The invention relates to the technical field of material processing, and particularly relates to a control method of a cold isostatic pressing device, which realizes stable control of dynamic adjustment of pressurization, pressure maintaining and pressure relief stages through multi-parameter cooperative monitoring so as to improve the control efficiency of the cold isostatic pressing device. According to the invention, through detection from surface inspection to internal characteristics, no leakage and correct placement of materials can be ensured, pressurization safety supervision is carried out from a pressurization angle, so that the pressure in the high-pressure bin is stably increased according to a standard pressure increasing rate and a standard real-time pressure value, and the pressure in the high-pressure bin is increased along with a segmented pressure maintaining treatment process. According to the method, the control precision and strategy are adjusted in stages, the full-period requirement of materials from rapid densification to stress release is matched, the problem of excessive densification or insufficient densification caused by traditional constant-pressure pressure maintaining is solved, meanwhile, pressure relief is managed in real time, the backflow rate of hydraulic oil is controlled, and the working efficiency is improved. Material damage caused by too high speed of the high-pressure section is avoided, and the overall pressure reduction time is shortened.

The invention provides a steam turbine quick starting system and method based on low-pressure rotor impulse rotation, belongs to the technical field of steam turbine operation control, and can at least partially solve the problem that the starting time of a steam turbine is long due to the fact that impulse rotation can only be achieved after sufficient cylinder warming during cold state starting in a starting mode adopted by an existing steam turbine set. The system comprises a steam turbine unit, a conveying pipeline assembly, a reheating temperature and pressure reduction system and a main steam temperature and pressure reduction system, and has the beneficial effects that the system adopts a low-pressure cylinder impulse rotation mode, a steam passage can be rapidly established through the reheating temperature and pressure reduction system and the main steam temperature and pressure reduction system at the initial stage of boiler ignition, and early impulse rotation is achieved; the cylinder warming waiting time is shortened, and the overall starting efficiency of the unit is improved.

The invention discloses a hyperbaric oxygen chamber rapid decompression safety control system and method based on big data, and relates to the technical field of hyperbaric oxygen chamber control, and the hyperbaric oxygen chamber rapid decompression safety control system comprises a data management unit, an anomaly analysis unit and a decompression control optimization unit. Accurate acquisition and preprocessing of real-time operation data in a cabin are achieved through the data management unit, key operation features are extracted, feature data are deeply mined in combination with the anomaly analysis unit, core factors influencing pressure reduction stability are effectively recognized, the pressure reduction control optimization unit constructs a dynamic pressure regulation and control model based on key factors, and the pressure reduction stability is effectively improved. And the pressure parameters are adjusted in real time, so that intelligent and refined control of the pressure reduction process is realized, the safety and stability of system operation are improved, and the occurrence probability of sudden risks in the pressure reduction process is further reduced.

The present application relates to the technical fields of traditional Chinese medicine extraction, and discloses a steam condenser for traditional Chinese medicine extraction, which comprises a spiral water cooling structure, a rotary linear motion structure and an elastic resistance type pressure reduction structure, a discharge port fixedly installed at a liquid discharge port and internally provided with a spiral spring with a basic same elastic strength as a low pressure strength in the working state of a concentration tank and a valve plate extruded by the spiral spring and in a closed state. The steam condenser for traditional Chinese medicine extraction can be connected with a low pressure type concentration tank, has a small influence range on the low pressure state in the concentration tank, can guarantee the normal evaporation and concentration function of the traditional Chinese medicine liquid in the concentration tank, can condense high temperature steam and can produce a suction type driving effect on the high temperature steam in the concentration tank, so that the high temperature steam can be condensed in time, the condensed liquid can flow back to the concentration tank to be evaporated and concentrated again, and the effective utilization rate of the liquid medicine is improved.

The utility model discloses a high-pressure steam extraction assembly and an ultra-supercritical adjustable steam extraction turbine, and relates to the technical field of turbines. The problems that heat is wasted and coal consumption is increased due to the fact that an existing ultrahigh-pressure heat supply steam extraction mode adopts a steam temperature and pressure reduction mode are solved. The steam supplementing device comprises a high-pressure cylinder, a steam supplementing pipeline and a three-way connector, the steam supplementing pipeline is arranged between the high-pressure cylinder and a steam supplementing valve, one end of the steam supplementing pipeline is communicated with the steam supplementing valve, and the other end of the steam supplementing pipeline is communicated with the high-pressure cylinder through the three-way connector. The three-way connector is arranged behind the high-pressure cylinder through flow of the fifth level, the pressure and temperature of steam after the high-pressure cylinder through flow of the fifth level are closest to the standard of an industrial park, and the three-way connector can mix high-temperature steam in the steam supplementing valve and steam after acting in the cylinder and extract the mixed steam, so that the temperature and pressure of the steam are adjusted; and moreover, temperature and pressure reduction is not needed, so that the waste of heat is avoided, and the coal consumption is further reduced.

The invention belongs to the field of hydrogen purification, and particularly relates to a temperature control type hydrogen purification system and a purification regeneration method. The system comprises a water tank, a refrigerating unit, an electric heater, at least one adsorption tower, a circulating water pump, a purging gas buffer tank, a purging pipeline and a control unit, the adsorption tower is of a jacket structure, a coil pipe is arranged in a jacket, and an inlet and an outlet of the coil pipe are connected with the water tank to form a circulating water loop, so that the temperature in the adsorption tower is kept at 20-30 DEG C; the purge gas buffer tank is used for receiving and temporarily storing the hydrogen obtained in the sequential discharge pressure reduction step; the control unit is used for adjusting the pressure in the water tank to change the saturated vapor pressure of water, so that daily constant-temperature adsorption and regeneration stage heat supply are realized in the same water body; and the regeneration stage adopts program control of constant-speed heating-stage constant temperature-constant-speed cooling. The optimal adsorption temperature in the adsorption process is kept in normal production, and meanwhile, when the adsorption tower needs to be regenerated, online regeneration is performed, so that the emptying loss is avoided, and the production cost is reduced.

The invention relates to the technical field of underground water monitoring, and discloses a shallow underground water burial depth monitoring and sampling device. The monitoring and sampling device comprises a drilling unit, a monitoring unit, a sampling unit and a control unit. A hollow cavity is formed in the drilling unit, the sampling unit comprises a pressure reduction system, a check valve and a sampling guide pipe with a control valve, and the pressure reduction system comprises a power device, a closed piston driven by the power device and a reset element. The control unit is electrically connected with the sensor and the pressure reduction system. According to the invention, drilling, monitoring, sampling and control are integrated, the full-flow automatic closed-loop operation of water level monitoring and water sample collection is realized, the problems of separation, complexity, easy pollution and water body disturbance in the traditional method are solved, and the field monitoring and sampling efficiency and data reliability are improved.

The invention relates to a control method of auxiliary breathing equipment, a controller, equipment and a storage medium. The auxiliary breathing equipment comprises a first cavity, a second cavity, a pipeline assembly and a gas driving assembly. The method comprises the following steps: periodically acquiring detection information of intra-pulmonary pressure during the period of providing ventilation support by the auxiliary breathing equipment; in response to the fact that the detection information of the intra-pulmonary pressure exceeds a preset pressure range, pressure reduction operation or pressure increase operation is executed to adjust the intra-pulmonary pressure to be within the preset pressure range; the decompression operation comprises the steps that the pipeline assembly and the gas driving assembly are controlled, so that redundant gas in the lung is exhausted to the external environment through the second cavity in the process of maintaining partial gas circulation of the lung between the first cavity and the lung; the pressurization operation comprises the steps that the pipeline assembly and the gas driving assembly are controlled, so that gas of the breathing gas source is introduced into the lung through the first cavity in the process of maintaining partial gas circulation of the lung between the second cavity and the lung. The safety of ventilation support can be improved.

The invention aims to provide a coal mine water inrush body deep ex-situ dredging and restoring method and system, and belongs to the technical field of coal mine water disaster prevention and control. The system comprises a water inrush body recognition module, a drainage depressurization system, a closed pipeline collection system, a storage stratum screening and well design module, a high-pressure storage ectopic dredging system and a safety monitoring system. According to the method, the water inrush body is identified by finely evaluating the hydrogeological conditions, the optimal hydrogeological parameters are obtained by using the parameter inversion model and the particle swarm optimization, and drainage and pressure reduction are guided; a reservoir capacity grade dynamic evaluation system is established, a deep suitable stratum is screened, collected mine water is stored back to the deep part by using high-pressure equipment, and full-period safety monitoring is performed in combination with a multi-source data fusion early warning model. The strategic reserve of the mine water depth is achieved, the underground water ecology is effectively maintained, and the treatment cost and the safety risk are remarkably reduced.

The application relates to a slurry valve with high sealing durability, belonging to the slurry valve field, which comprises an upper valve body, a lower valve body, a valve flap, a sealing ring, an upper ring plate and a lower ring plate, the relative positions of a first pressure reduction ring part and a second pressure reduction ring part are protrusively provided with first protruding teeth; the opposite positions of the upper ring plate and the lower ring plate are protrusively provided with second protruding teeth, the gap between the tooth groove bottom of the first protruding teeth and the tooth top of the second protruding teeth and the gap between the tooth top of the first protruding teeth and the tooth groove bottom of the second protruding teeth are set as second pressure reduction holes, the inner diameters of the upper ring plate and the lower ring plate are connected through a sealing elastic piece, the sealing elastic piece is used for forcing the vertical separation movement of the upper ring plate and the lower ring plate; the space surrounded by the groove wall of the expansion groove and the inner wall of the sealing elastic piece is set as a first pressure reduction space, and the space surrounded by the sealing elastic piece, the sealing ring, the first connecting ring part and the second pressure reduction ring part is set as a second pressure reduction space. The application can reduce the erosion and wear of the sealing surface, so as to improve the sealing durability.

The utility model discloses an air bag polishing pressure intelligent feedback device which comprises a handle, a polishing mechanism used for polishing is arranged on one side of the handle, and a power mechanism used for providing power for the polishing mechanism is arranged in a polishing machine body. A transmission mechanism used for transmitting power generated by the power mechanism to the polishing mechanism is arranged in the polishing machine body, and an air supplementing and reducing mechanism used for inflating the polishing mechanism and detecting air pressure is arranged in the polishing machine body. The polishing mechanism is used for polishing the workpiece with the concave surface. And the power mechanism is arranged for providing power when the workpiece is polished. And the transmission mechanism is arranged for transmitting power to the polishing mechanism. The air supplementing and reducing mechanism is arranged and used for detecting the pressure in the air bag when the workpiece with the concave surface is polished, and pressure supplementing and pressure reducing are conducted on the air bag according to the detected pressure.

The invention discloses a three-telescopic stand column of a hydraulic support, and relates to the technical field of hydraulic supports. The three-telescopic stand column of the hydraulic support comprises a first cylinder body, a second cylinder body, a third cylinder body, a movable column and a liquid supply assembly, the piston end of the second cylinder body is assembled in an inner cavity of the first cylinder body in a sliding mode, a first cavity and a second cavity are divided on the two axial sides of the second cylinder body, and the piston end of the third cylinder body is assembled in an inner cavity of the second cylinder body in a sliding mode; the piston end of the movable column is slidably assembled in an inner cavity of the third cylinder body, the liquid supply assembly comprises a first pipe, a second pipe and a one-way overflow valve, the first pipe is communicated with the first cavity, the second pipe is communicated with the second cavity, the input end of the one-way overflow valve is connected with the first pipe, and the output end of the one-way overflow valve is connected with the second pipe. The one-way overflow valve is used for being communicated with the second pipe when the pressure in the first pipe is larger than the first set pressure. The three-telescopic stand column of the hydraulic support has the pressure reducing and buffering effects and is good in impact resistance.

The application provides a one-way sealing ring, a sealing mechanism, a tail pipe top packer and a tail pipe cementing process, wherein the one-way sealing mechanism comprises a center pipe, an upper deformed sleeve arranged on the outer wall of the center pipe, a lower deformed sleeve arranged on the outer wall of the center pipe, the upper deformed sleeve and the lower deformed sleeve being spaced apart in the axial direction, a sealing element arranged on the outer wall of the center pipe, the lower end of the sealing element being in abutment with the upper end of the lower deformed sleeve, an expansion cone arranged between the upper deformed sleeve and the sealing element, a sealing groove being arranged on the inner wall of the expansion cone in the circumferential direction, a sealing ring being arranged in the sealing groove, a flow-off groove being arranged on the inner wall of the expansion cone in the axial direction, the flow-off groove penetrating through the upper end and the lower end of the expansion cone, and fluid being allowed to flow only in one direction from the upper end of the expansion cone to the lower end of the expansion cone along the flow-off groove, while the fluid under the packer is allowed to flow upward, the wellhead annulus is allowed to be pressurized for cement setting, the pressure reduction caused by volume shrinkage is prevented to prevent the stratum fluid from flowing out, and the cementing quality is ensured.

The application discloses a kind of multi-pilot logic control type double pump split-flow multi-way valve and control method, multi-way valve includes valve body, and the valve body is provided with oil inlet P1, oil inlet P2, at least two main valve spools and control corresponding main valve spool action proportional pressure reducing valve, valve body also includes split-flow control valve spool and logic sequence valve.When the main valve spool of multi-way valve is individually operated, the pilot driving oil after proportional pressure reducing valve cannot be driven split-flow control valve spool by logic sequence valve, at this time, multi-way valve is in double pump confluence state, maximum power is used.When two or more main valve spools of multi-way valve are operated, the pilot signal oil after pressure reduction from proportional pressure reducing valve is used to push logic sequence valve spool, the pilot driving oil without proportional pressure reducing valve is pushed split-flow control valve spool after passing through logic sequence valve, at this time, multi-way valve is in split-flow state.

The present application belongs to the field of hydrogen purification, and particularly relates to a temperature control type hydrogen purification system and a purification regeneration method. The system comprises a water tank, a refrigerator unit and an electric heater, at least one adsorption tower, a circulating water pump, a purge gas buffer tank, a purge pipeline and a control unit. The adsorption tower is of a jacket structure, and a coil pipe is arranged in the jacket. The inlet and outlet of the coil pipe are connected with the water tank to form a circulating water loop, so that the temperature in the adsorption tower is kept at 20-30 DEG C. The purge gas buffer tank is used for receiving and temporarily storing hydrogen obtained in the step of pressure reduction after normal discharge. The control unit is used for adjusting the pressure in the water tank to change the saturated vapor pressure of water, so that heat supply is realized in the same water body in the daily constant temperature adsorption and the regeneration stage. In the regeneration stage, the program control is adopted, which comprises constant temperature at a constant speed, constant temperature at a constant speed and constant temperature at a constant speed. In the normal production, the present application keeps the optimum adsorption temperature in the adsorption process, and when the adsorption tower needs to be regenerated, online regeneration is realized to avoid loss caused by discharge and reduce the production cost.