319 results about "Tank pressure" patented technology

The invention discloses an extended-range hydrogen fuel power ship propulsion system, which relates to the technical field of ship propulsion and comprises an acquisition module, a quantum annealing optimization module and a quantum chip, the acquisition module is used for eliminating noise interference of acquired hydrogen energy ship power parameters through a Kalman filtering algorithm and generating a standardized data packet, and the quantum chip is used for receiving the standardized data packet and outputting the standardized data packet. The method comprises the following steps: mapping hydrogen energy ship power parameters into an Isin model, generating a control instruction according to a hydrogen fuel consumption rate, an equipment life attenuation coefficient and a navigation task priority weight, inputting the control instruction into a simulation model of a proton exchange membrane by a proton membrane regulation and control module, and dynamically regulating a hydrogen production rate and fuel cell power, according to the system, the efficient hydrogen energy closed-loop monitoring unit and the three-level safety protocol are adopted, the response speed and precision are improved, the stability and safety are remarkably enhanced, it is ensured that a ship can reliably operate under the complex working condition, and potential safety risks are reduced.

The invention discloses a resin tank pressure resistance test method and system based on deep learning, and relates to the technical field of data processing. The method comprises the following steps: performing significant feature analysis based on a surface image of a target resin tank, determining a plurality of abnormal areas, performing defect identification, and constructing a defect distribution diagram according to an identification result; based on equipment attributes, setting retrieval constraint conditions to retrieve voltage withstanding test records of similar products, obtaining a sample data set, performing supervision training on the deep learning operator by using the sample data set, and constructing a voltage withstanding performance predictor; environment parameters of the target resin tank in a preset time zone are collected, the defect distribution diagram and the environment parameters are input into the pressure resistance predictor, and the predicted maximum pressure bearing value is output to serve as a pressure resistance test result. The technical problem that in the prior art, a resin tank pressure resistance test result is not accurate enough is solved, defect distribution and environmental parameters are analyzed in combination with deep learning, and the technical effect of improving pressure resistance prediction accuracy is achieved.

The invention discloses an intelligent monitoring method and system for an intelligent breather valve, and relates to the technical field of intelligent valve monitoring. Fitting a circulation volume curve based on the uploaded tank body pressure and circulation volume in combination with data of valves with different calibers; the opening state of the valve is judged according to the logic relation between the state of the proximity switch and the pressure of the tank body; and calculating the discharge amount or the suction amount based on the opening state of the valve and the circulation volume curve. According to the method, on the basis of the relation between the tank pressure and the circulation volume, the circulation volume curve is fitted through the quartic equation, errors of a traditional linear model are avoided, and the applicability to valves with different calibers is guaranteed. The opening state of the valve is judged according to the proximity switch state and pressure relation, and the defect that a traditional system is inaccurate or delayed in judgment of the valve state is overcome. By calculating the emission amount and the suction amount and combining VOCS concentration monitoring, emission of harmful gas is effectively reduced, and the environmental protection requirement is met.

The invention relates to the technical field of hydrogen energy storage and control, and discloses a hydrogen storage tank pressure and temperature control method and device based on model predictive control, and the method comprises the steps: determining a hydrogen state equation of a hydrogen storage tank, and constructing a hydrogen mass conservation equation and a hydrogen energy conservation equation; based on the hydrogen mass conservation equation and the hydrogen energy conservation equation, a state prediction model of the hydrogen storage tank state related to the net hydrogen flow change is established, and the hydrogen storage tank state comprises hydrogen pressure and hydrogen temperature; a target function is constructed with the hydrogen storage tank state and the net hydrogen flow as control targets, and constraint conditions are configured; on the basis of the input net hydrogen flow sequence of the state prediction model and the predicted hydrogen storage tank state sequence output by prediction, the target function is subjected to minimum solving, and the optimal net hydrogen flow sequence is obtained through iteration; and adjusting an inlet / outlet valve of the hydrogen storage tank based on the optimal net hydrogen flow sequence. The operation efficiency of the hydrogen storage system can be improved.

The invention relates to the technical field of cooling water abnormity monitoring, in particular to a steel slag pressure hot stuffy rolling cooling water abnormity alarm system and method.Roll gap cooling water flow, injection temperature, hot stuffy tank pressure and bearing vibration data are collected, a dynamic mapping relation between position coordinates of a spraying opening and a water inlet valve is established, temperature and pressure time sequence offset is calculated, and the temperature and pressure time sequence offset is calculated; the temperature judgment boundary is corrected by combining the pressure bearing limit value of the sealing ring and the real-time flow, and an abnormal alarm is triggered according to the temperature over-limit frequency in the continuous time period. A multi-source analysis framework is constructed by integrating temperature, flow, pressure and vibration parameters, single-point monitoring limitation is eliminated, nonlinear influence of the flow on tank pressure is quantified by adopting a dynamic weight model, a self-adaptive temperature threshold value is generated in combination with a sealing pressure bearing limit, dynamic coupling of an alarm mechanism is realized, an abnormal scene is positioned based on time sequence analysis and coordinate mapping, and the accuracy of monitoring is improved. The sealing hidden danger is pre-judged through the thermal unbalance coefficient, and the pressure rate deviation is intercepted in real time.

The invention relates to a BOG dynamic balance treatment system for marine ship and land liquid cargo thin film tanks. The system comprises a first thin film tank and a second thin film tank, the first thin film tank is connected with the second thin film tank; the device further comprises a BOG cooling and pressure regulating mechanism. The system further comprises a liquid cargo processing mechanism. The BOG cooling and pressure regulating mechanism is connected with the second thin film tank; the liquid cargo processing mechanism is connected with the first thin film tank and the second thin film tank. And the BOG cooling and pressure regulating mechanism is connected with the liquid cargo treatment mechanism, so that the liquid cargo from the first thin film tank exchanges heat with the BOG from the second thin film tank. The first thin film tank is a ship thin film tank, and the second thin film tank is a land liquid cargo thin film tank; or the second film tank is a ship film tank, and the first film tank is a land liquid cargo film tank. Compared with the prior art, the problem that storage of compressed low-temperature liquefied gas such as LNG is affected due to the fact that the temperature of a land liquid cargo thin film tank (or a ship thin film tank) is increased due to the fact that the land liquid cargo thin film tank (or the ship thin film tank) is exposed to the sun and BOG generated by liquid cargo such as LNG is increased can be effectively solved.

The invention relates to a tank device (1) for storing a gaseous medium, in particular hydrogen, comprising a valve device (2), and a tank (10) and having a longitudinal axis (11). The valve device (2) has a valve housing (20), which is equipped with a pilot valve element (18) that can be moved along the longitudinal axis (11), said pilot valve element (18) interacting with a first valve seat (27) in order to open and close a first outlet opening (56) and thus forming a pilot valve (44). The valve device (2) can be actuated by means of a solenoid coil (14), wherein a main valve element (19) is arranged in the valve housing (20), said main valve element (19) interacting with a second valve seat (40) in order to open and close a second outlet opening (31) and thus forming a main valve (191). The tank device (1) comprises a screw-in housing element (24), wherein the valve device (2) is integrated into a neck region (6) of the tank (10) in a fixed manner by means of the screw-in housing element (24). The valve device (2) is arranged in the tank (10) by means of a tank pressure and is in a closed position by means of a spring (26) when the solenoid coil (14) is deactivated.

The invention discloses an automatic pneumatic conveying and pressure regulating and controlling method for coking fly ash, and relates to the field of coking fly ash treatment. The mode that a plurality of conveying tanks work alternately is adopted, it is guaranteed that one tank is in a preparation or pressurized state at any time, the other tank conducts conveying operation, and therefore the continuity and stability of the system are guaranteed. And secondly, by calculating the conveying amount of coking fly ash per hour and setting the tank pressure target value corresponding to each conveying tank based on the conveying amount, the whole conveying process can adapt to changes of production requirements, and stable pressure control can be kept. Moreover, nitrogen is used as a fluidizing medium, so that the problem of material blockage is effectively avoided, and the conveying efficiency and safety are improved. In addition, assemblies such as a powder adjusting valve and a pneumatic adjusting valve are arranged, the opening degree of the valves is dynamically adjusted according to the real-time conveying speed, and accurate control over the flow and stable maintenance of pressure in the conveying process are guaranteed.

The invention discloses a transformer explosion-proof and fault monitoring device and method, and belongs to the technical field of power equipment. The specific device comprises a transformer oil tank pressure reduction module, an on-load tap-changer pressure reduction module, an oil and gas separation tank, a gas discharge pipeline, a nitrogen injection module, a transformer protection control cubicle, an oil-immersed cable oil tank pressure reduction module and a transformer module. The specific method comprises the following steps: acquiring transformer data; calculating a power factor / loss factor according to the acquired transformer bushing current; setting early warning threshold values of transformer capacitance, a power factor / loss factor and a partial discharge signal, and judging whether the data reach the corresponding early warning threshold values or not; and after any data in the judgment result reaches an early warning threshold value, judging that the transformer has a fault, triggering early warning and performing transformer pressure relief, thereby realizing explosion prevention and fault monitoring of the transformer. According to the invention, pressure relief protection of the transformer cable box, the on-load tap-changer module and the main oil tank is realized, and online monitoring and fault diagnosis of key monitoring signals are provided.

The invention discloses an air distribution device for semiconductor processing and an air supply system thereof. The air distribution device comprises an air distribution block, a plurality of air distribution pipelines communicated with the air distribution block, and automatic pressure control valve assemblies arranged in the air distribution block, wherein the number of the automatic pressure control valve assemblies is the same as that of the air distribution pipelines; an air inlet channel and a plurality of air distribution channels communicated with the tail end of the air inlet channel are arranged in the air distribution block; an automatic pressure control valve assembly is arranged in each gas distribution channel, and the automatic pressure control valve assemblies automatically control the gas distribution opening degree of the gas distribution channels according to the current pressure of the gas distribution channels. The automatic pressure switch valve is arranged in the gas distribution block, the opening degree of each gas distribution channel can be kept consistent, so that the output gas flow is the same, meanwhile, as the automatic pressure switch can adjust the opening degree according to the gas pressure, when the pressure of the gas storage tank is reduced, the injection pressure of the gas outlet can still be kept, and finally the uniformity and high pressure of the gas quantity of each sub-chamber are realized. And the film deposition quality is improved.

Methods and systems for diagnosing an evaporative emissions system are discussed. An example method includes diagnosing a venturi pump of an evaporative emissions system based on feedback from an evaporative leak check module (ELCM) pressure sensor and a fuel tank pressure transducer (FTPT). An engine of a vehicle is off during the diagnosing.

The invention provides a device and a method for reducing exhaust loss by using the pressure of a liquid hydrogen storage tank, and relates to the technical field of liquid hydrogen storage and transportation safety. The device comprises an adsorption storage assembly, a desorption recovery assembly and an adsorption enhancement assembly which are arranged in a gas pillow of the liquid hydrogen storage tank. The adsorption and storage assembly is communicated with the air pillow through a one-way mechanical low-temperature valve, is internally provided with a solid adsorption material and a vacuum heat insulation cylinder, and is used for adsorbing and storing evaporation gas and reducing the tank pressure when the tank pressure is increased; the adsorption enhancing assembly comprises a low-temperature hydrogen regulating valve and a low-temperature heat exchanger, and the throttling effect of high-pressure hydrogen in the tank is used for refrigerating an adsorption material, so that the adsorption capacity of the adsorption material is improved; the desorption recovery assembly heats an adsorption material through an intermediate heater, and controllable release of hydrogen is achieved. According to the invention, the active management of the pressure of the liquid hydrogen storage tank and the efficient recovery of the boil-off gas are realized, the exhaust period is obviously prolonged, the hydrogen loss is reduced, and the storage and transportation economy and safety are improved.

The utility model relates to the technical field of pressure testing, and discloses a tank body pressure testing device, which solves the problem of tank body pressure testing in the current market, and comprises a main tank body, a top sealing cover fixedly connected to the top of the main tank body, a supporting column fixedly connected to the bottom of the main tank body, and a pressure release valve arranged at the bottom of the main tank body, a heating box is fixedly connected to one side of the main tank body, a control machine body is fixedly connected to one side of the heating box, a pressure pump is fixedly connected to the other side of the heating box, and a side supporting table is fixedly connected to the bottom of the pressure pump. The stability of the supporting column in the supporting process is improved, and the testing accuracy is improved; and meanwhile, the cooling liquid circulates along the inner side of the circulating box, so that the thermal insulation layer can be uniformly and quickly cooled, the cooling efficiency of the main tank body is improved, and the pressure test time of the main tank body is shortened.

The invention provides a high-reliability arcing protection design C-GIS switch cabinet, and relates to the technical field of switch cabinets, the high-reliability arcing protection design C-GIS switch cabinet comprises a cabinet body frame, a mechanism operation chamber is arranged at the upper end of the front side of the inner wall of the cabinet body frame, a low-voltage chamber is arranged at the lower end of the front side of the cabinet body frame, and a core gas box is arranged at the upper end of the middle in the cabinet body frame; a circuit breaker chamber is arranged at the middle end in the cabinet body frame; the independent circuit breaker pressure relief channel is arranged between the cable chamber and the low-voltage chamber, a bidirectional pressure buffering mechanism is formed by matching with the one-way explosion venting plate, rapid directional pressure relief can be achieved when the circuit breaker chamber breaks down, door body impact can be relieved through cross-chamber pressure relief when the cable chamber arches, and an overflow path of arcing gas is effectively blocked; the front, middle and rear three-section type compartment layout strictly separates a pressure relief channel from a functional chamber, and cooperates with an independent upper gas tank pressure relief channel, so that the arcing influence range is greatly reduced, and the cascading failure risk is reduced from the spatial isolation level.

The invention discloses a low-temperature liquid storage tank pressure prediction method based on a non-thermal equilibrium state model, and aims to improve the calculation speed of a pressure evolution law so as to reduce the time required for predicting the pressure of a storage tank. The method comprises the steps that firstly, a pressure sensor, a temperature sensor and a liquid level meter are used for collecting the temperature of a current gas phase and liquid phase area of the low-temperature liquid storage tank, the pressure in the storage tank, the vacuum degree of a heat insulation layer and the real-time liquid level; secondly, transmitting signal data obtained by monitoring of the sensor to a processor, and checking the density, phase change latent heat and thermodynamic energy of gas and liquid phases in the storage tank through REFPROP software; then establishing a three-dimensional model and a heat and mass transfer relationship of the storage tank, and performing heat transfer analysis on gas-phase and liquid-phase media in the storage tank; secondly, performing energy analysis on a gas phase region, a liquid phase region and a gas-liquid interface in the storage tank according to the established three-dimensional model and a heat transfer analysis result, and selecting a proper time step to perform iterative calculation so as to ensure the calculation precision of each step; storing the calculation result of the previous step, and searching and taking thermodynamic parameters of the next time step through REFPROP software according to the parameters obtained through calculation; finally, the safe storage time of the storage tank under the current liquid filling volume and the heat insulation performance is calculated, and safe work of the storage tank is guaranteed.

The invention discloses a fuel tank pressure sensor, and belongs to the technical field of automobile sensors, the fuel tank pressure sensor comprises a shell, a shell cover, a PCBA circuit unit and a ventilation unit, a monitoring channel is arranged in the shell, two sides of the monitoring channel are provided with communication connectors, the front end of the shell is provided with a wiring harness connector, the PCBA circuit unit is fixed in the shell, and the ventilation unit is fixed in the shell. The shell cover covers the outer shell, the ventilation unit is arranged on the shell cover, the PCBA circuit unit comprises a ceramic substrate and a circuit substrate with an electrical device, a detection hole communicated with a monitoring channel is formed in the outer shell, the ceramic substrate is bonded in the outer shell through a sealant, and the ventilation unit is arranged on the outer shell. The ceramic substrate is provided with a through hole corresponding to the detection hole, the circuit substrate is bonded above the ceramic substrate, and a monitoring chip is packaged in the circuit substrate. The device is high in reliability and low in manufacturing cost, and improves the accuracy and long-term stability of oil tank pressure detection.

The present disclosure relates to a method and device for optimizing navigation of a ship. The method according to an embodiment of the present disclosure may generate recommended navigation information about a navigation route of a ship, based on navigation plan information associated with a departure location and an arrival location of the ship, predict a boil-off gas (BOG) generation amount of the ship and a tank pressure value of the ship, based on the recommended navigation information, and obtain optimal navigation information associated with operation control of the ship, based on the BOG generation amount and the tank pressure value.

The application belongs to the technical field of shield construction, and discloses a method and system for early warning of settlement trend of shield construction crossing a dam; the method comprises the following steps: collecting silt layer geological data before the shield crosses the dam, and analyzing to obtain the distribution range and sensitivity level of the silt layer; collecting the tunneling parameters in real time in units of each ring when the shield machine crosses the silt layer section, and analyzing to obtain the disturbance index; collecting the real-time tunneling speed and the cutter head rotating speed, and recording the shutdown parameters when the complete shutdown condition is met; collecting the slurry tank pressure and the shutdown duration during shutdown, and calculating the pressure data; for the current sensitivity level, the preset hierarchical early warning rule is adopted, the current disturbance index basic threshold is corrected to obtain the corresponding dynamic threshold, the pressure data is compared with the dynamic threshold, and the early warning is issued according to the preset trigger logic classification; and the application improves the safety of shield construction crossing the dam.

The embodiment of the utility model discloses an electronic parking brake module test system. The system comprises a gas supply module, a gas tank, a first gas pressure sensor, a second gas pressure sensor, a control panel and an electronic parking brake module, the control panel is used for generating and sending a test instruction and target opening information based on the test trigger operation; the gas supply module is used for providing high-pressure gas for the electronic parking brake module in response to the test instruction; the electronic parking braking module is used for controlling the electronic parking braking module to adjust the opening degree in response to the target opening degree information; the first air pressure sensor is used for collecting and sending a current air inlet pressure value to the control panel; the second air pressure sensor is used for collecting and sending a current air tank pressure value to the control panel; and the control panel is also used for determining a target test result based on the current air inlet pressure value, the current air tank pressure value, a pre-stored target air inlet pressure value and a pre-stored target air tank pressure value, so that the dynamic test of the electronic parking brake module is automatically carried out, and the test efficiency is improved.

The utility model discloses a kind of hot tank exhaust liquefaction structures, including condensate backflow member being fixed on hot tank, steam exhaust pipe being installed on condensate backflow member, condensate backflow member is provided with steam-liquid blending cavity, steam exhaust pipe is provided with the steam passage of intercommunication steam-liquid blending cavity, the inlet end of steam passage is communicated with the inner cavity of hot tank by steam-liquid blending cavity, steam-liquid blending cavity inner wall and steam exhaust pipe outer wall form condensate space, steam converges to form liquid in condensate space inner wall and is backflowed to hot tank by steam-liquid blending cavity. With the effect that hot tank can be effectively pressure-relieved, reduce steam exhaust amount when hot tank pressure-relieved.

The invention provides an oil return pipe mechanism and a compressor. The oil return pipe mechanism comprises an oil return pipe, a supporting column, a spring, an activation valve plate and a fixed valve plate, and the oil return pipe is communicated with an upper support oil pool, a lower support oil pool and a bottom oil pool. The activation valve plate can slide and is initially attached to the fixed valve plate under the elastic force of the spring; when the pressure of the oil pool rises to a set value, the oil pushes and activates the valve plate to overcome the resistance of the spring, a corresponding oil return channel is opened, and redundant oil is guided back to the oil pool at the bottom. The upper support oil return pipe is opened preferentially to maintain the pressure of the backpressure oil groove, and the lower support oil return pipe is opened to further relieve pressure when the rotating speed is increased, so that self-adaptive oil pressure adjustment under different working conditions is achieved, dynamic disc backpressure is stabilized, friction loss is reduced, and operation reliability is improved. The scroll compressor is reasonable in structural layout, low in machining precision requirement, high in oil return efficiency and suitable for scroll compressors with various rotating speed frequencies.

The invention relates to a low-temperature propellant temperature control method based on real-time pressure feedback of a storage tank on a rocket, which comprises the following steps of: acquiring a pressure value, a temperature value and flow of the storage tank in real time to determine whether the pressure value is within a set pressure range; the pressure value of the storage box is adjusted by executing control strategies such as adjusting the temperature set value, and the first set temperature is obtained; when the pressure value is within a set pressure range, determining an optimization target of the state prediction model, inputting the pressure value, the temperature value and the flow into the state prediction model, obtaining a target control variable and a second set temperature of the state prediction model when the optimization target is met, determining a target set temperature according to the first set temperature or the second set temperature, and performing state prediction according to the target set temperature. The target adjustment information including the target set temperature is obtained, and the temperature set value in the filling process is adjusted according to the target adjustment information, so that the low-temperature propellant is always in the optimal temperature state in the filling process, and the filling quality and efficiency are improved.

A closed fuel tank system (1) comprising: a fuel tank (10), a reservoir (20), a vapor channel (61H), a purge channel (62H), a shut-off valve (61), a purge valve (62), a tank pressure sensing unit (47), a lid flap actuating unit (41), a lid locking part (50A), a control unit (70), and a pre-fueling actuating unit (42). The lid locking part (50A) is designed to lock and unlock the lid flap (50) covering a fuel tank opening and unlocks the lid flap (50) when the lid flap actuating unit (42) is actuated by a user and the internal pressure of the fuel tank (10) is less than or equal to a predetermined pressure.The pre-fueling actuation unit (42) is designed to open the shut-off valve (61) to reduce the internal pressure of the fuel tank (10) to less than or equal to the specified pressure when it is actuated prior to actuating the lid flap actuation unit (42).

The application relates to the technical field of pressure detection, in particular to a LNG receiving station tank internal pressure detection system and a detection method, which comprises a pressure detection module and a gas storage tank, and the pressure detection module is arranged on the gas storage tank. The pressure detection module comprises a pipe, a sliding block and a sealing column, a sealing ring is arranged on the pipe, an installation plate is arranged on the pipe, a controller is arranged on the installation plate, and the controller is connected with a pressure gauge. A sliding groove A is arranged on the pipe. The sliding block is arranged in the pipe, two clamping blocks are symmetrically and elastically arranged in the sliding block, an outer thread pipe penetrates through the sliding block and is screw-connected with the sliding block, a driving piece for driving the outer thread pipe to rotate is arranged in the pipe. The sealing column is arranged on the inner side of the installation plate, the sealing column is located in the outer thread pipe, a pressure detection probe is detachably arranged on the inner side of the sealing column, and the pressure detection probe is connected with the controller. The application can realize effective and rapid disassembly, the pressure detection probe can be replaced conveniently and simply in the subsequent replacement, and gas leakage does not occur.

This application relates to a hydraulic brake cylinder pressure control system and its control method. The control system includes a pressure generation module and a pressure control module. The pressure generation module includes a check valve, an external accumulator, and an accumulator sensor. The check valve is connected to an oil tank. The pressure control module includes a proportional solenoid valve connected to the external accumulator and the brake cylinder; a pressure-holding solenoid valve located at the overflow port of the proportional solenoid valve, which is connected to the oil tank via the pressure-holding solenoid valve; a brake cylinder sensor collecting and outputting the brake cylinder pressure; and a brake cylinder pressure switch electrically connected to the brake cylinder sensor. During the relief condition, the proportional solenoid valve is de-energized and the pressure-holding solenoid valve is energized. During coasting or braking conditions, the proportional solenoid valve is energized, and the pressure-holding solenoid valve is de-energized after a delay. This application reduces the usage rate of the proportional solenoid valve and improves system reliability through the coordinated control of the proportional solenoid valve and the pressure-holding solenoid valve.

The invention relates to the technical field of tunnel engineering construction, and provides an in-hole advanced grouting construction method for a large shield to penetrate through a highway roadbed in a long distance, which comprises the following steps of: installing an advanced drilling machine on a shield tunneling machine, and rotating the advanced drilling machine to a specified drilling position; a drill rod of the advanced drilling machine is communicated with the shield advanced grouting pipe in a sealed mode; drilling is conducted through a drill rod of an advanced drilling machine, and when the drill hole reaches the preset depth, first mixed liquid is injected into the drill hole through the grouting pipe and the drill rod; after drilling is completed, retreating type double-slurry grouting is conducted through a grouting pipe, and in the grouting process, the pressure of a slurry bin of the shield tunneling machine is continuously monitored, and an advanced drilling machine drill rod and / or the shield tunneling machine are / is controlled to act till grouting is completed; and after grouting is completed, hole sealing is conducted through second mixed liquid. The water permeability of the stratum can be effectively reduced, a closed shell is formed on the inner wall of the tunnel, and the overall stability of the shield cutterhead side stratum is remarkably improved.

The utility model discloses a test device and a test system, and relates to the technical field of simulation test, the test device is used for an oil pressure sealing test of a fuse, the test device comprises an oil tank, a pressure control module, a temperature control module and a current control module, the oil tank is configured to be communicated with a gas source, and the oil tank is used for accommodating at least part of the fuse; the pressure control module is arranged between the air source and the oil tank and used for controlling the pressure in the oil tank. The temperature control module is arranged in the oil tank and used for controlling the temperature of insulating oil in the oil tank; the current control module is configured to be electrically connected with the power supply and form a current loop with the fuse to control the current passing through the fuse. According to the technical scheme, the pressure control module, the temperature control module and the current control module are arranged to correspondingly control the pressure, temperature and current conditions required in the oil pressure sealing test so as to meet the environment requirements of the oil pressure sealing test of the fuse, and therefore the use working conditions of the fuse under the national standard requirements are simulated.

2. Supply device for a hydraulic system (10), comprising at least a fluid supply with at least two supply pumps (20, 22), wherein at least one of the pumps (22) can be at least partially decoupled from the hydraulic system (10) depending on the volume flow requirement of the hydraulic system (10) by connecting this pump (22) to another pressure level which is lower than the pressure level of the hydraulic system (10), preferably tank pressure, wherein the decoupling of the pump (22) is carried out hydraulically via a switching valve (34) which has a main control stage (36) and a pilot stage (38) which generates a hydraulic control pressure as a signal during operation, which actuates the main control stage (36) and which has a predefinable switching hysteresis.

This application discloses a method, apparatus, equipment, and machine-readable storage medium for flash vapor control in liquefied natural gas (LNG) receiving terminals, relating to the field of LNG equipment technology. The method includes: obtaining the internal pressure value of the LNG storage tank under zero or low export conditions; adjusting the compressor load of the flash vapor pipeline to reduce flash vapor in the tank when the internal pressure value exceeds a preset lower limit; and performing a pressure-holding operation on the cold-insulating circulation pipeline based on the internal pressure value to further reduce flash vapor in the LNG storage tank. By combining the reduction of the internal tank pressure with the pressure-holding operation of the cold-insulating circulation pipeline, this method can significantly reduce the generation and emission of flash vapor, thereby improving the overall efficiency of the flash vapor treatment process.

The application discloses a kind of liquid seal breathing valve and method thereof, including the lower valve seat and upper insertion tube type valve cover of split arrangement;Lower valve seat is provided with the butt flange at lower end, and upper end is set to double sleeve structure;The upper end of double sleeve structure is open, including coaxially arranged inner sleeve, outer sleeve;Upper insertion tube type valve cover includes top cover and the insertion tube installed below top cover;Ball valve and pressure gauge are installed on top cover, and insertion tube is provided with several notches on the pipe wall close to lower end;Insertion tube is inserted between inner sleeve and outer sleeve, until the lower end of insertion tube is directly placed on lower valve seat, and the area surrounded by inner sleeve and outer sleeve is injected with sealing oil.It can be seen from this that the liquid seal breathing valve can realize the function failure of sealing liquid in extreme conditions, and when the upper limit of positive pressure fails to normally release pressure, the upper insertion tube type valve cover can be opened by positive pressure, so as to realize the purpose of releasing tank pressure, so that the liquid seal breathing valve has safety function.