680 results about "Pressure rise" patented technology

The invention relates to an optimal design method for controlling leakage pressure rise of a production pipe column. The method comprises the steps that whether annulus liquid in an oil sleeve annulus of a target gas well leaks or not is determined; if the annulus liquid in the oil sleeve annulus of the target gas well does not leak, the depth of a leakage point of the production pipe column is determined; under the condition that the depth of the leakage point is determined, a first changing curve of the maximum pressure value of the oil sleeve annulus along with the annulus liquid density is determined; according to the pressure bearing capacity of an oil pipe head, a production pipe column, a production casing and a packer, a second changing curve of the maximum value of the pressure control range of the oil sleeve annulus along with the annulus liquid density is determined; and the annulus liquid density is optimized and determined according to the first change curve and the second change curve, so that the oil sleeve annulus pressure is reduced to be within a safety threshold value. The annular pressure of the oil sleeve can be reduced to be within the safety threshold value on the premise that a production pipe column is not replaced and a well is not overhauled, the pipe column leakage pressure rising phenomenon is effectively controlled, the phenomenon that the pressure bearing capacity of a shaft is exceeded is avoided, the control cost is reduced, and the maintenance period is shortened.

The invention relates to the technical field of automatic control, in particular to an automatic control method of a BOG low-temperature recovery system for a storage tank for an LNG (liquefied natural gas) ship, which comprises the following steps: acquiring BOG pressure fluctuation data and temperature difference trend, analyzing pressure rise rate and cooling efficiency change, identifying a pressure peak value and a cooling lag section, screening a low-efficiency section and marking an optimization unit. And identifying an energy matching degree, analyzing energy loss distribution, identifying an over-limit node and a fault signal, and obtaining an energy and fault synchronous control table. According to the system, through real-time data monitoring and intelligent analysis, the BOG recovery process can be accurately controlled, energy circulation and cooling treatment can be optimized, the efficiency of a low-temperature recovery system can be improved, BOG pressure and temperature difference changes can be monitored, pressure fluctuation and cooling lag can be analyzed, continuous improvement of condensation efficiency can be ensured, control parameters can be accurately adjusted, energy loss is avoided, and the energy efficiency of equipment can be improved; energy consumption and equipment fault management are optimized, and efficient and safe operation of the low-temperature recovery system is ensured.

The invention relates to a micro-spraying system irrigation uniformity control method and system, and belongs to the technical field of agricultural irrigation energy saving. Calculating the flow data of each nozzle according to the data of the flow meters of the branch pipes; calculating the pressure distribution of each node under the condition of no throttle valve by using the irrigation area pipe network hydraulic model, and finding out the part with too high or too low pressure in the pipe network; a throttle valve is installed on a main pipe of a pipe network in an irrigation area, and the opening degree of the throttle valve is adjusted and the pressure rise of a water pump is calculated by taking the most disadvantageous spray head in the pipe network as a pressure reference; the flow condition in the pipe network is monitored in real time through the flow meter, and data are uploaded; the pressure is calculated through the pipe network hydraulic model, when the water pressure in the pipe network is abnormal, the throttling valve needing to be adjusted and the opening degree are calculated, workers are informed, and early warning is conducted in time. The service life of the system is prolonged, and the irrigation efficiency and the water resource utilization rate are improved.

The invention discloses a liquid hydrogen container heat leakage prediction and boost characteristic detection method and system. The method comprises the following steps: establishing a three-dimensional heat flow field model of a liquid hydrogen container; calculating the heat flow density of a gas-liquid interface based on the three-dimensional heat flow field model so as to adjust the liquid hydrogen evaporation capacity; total heat leakage is obtained through finite element simulation and experimental data collaborative calibration; calculating a static evaporation rate according to the total heat leakage; establishing a nonlinear mapping model of the static evaporation rate and the boost rate through a response surface regression method; the wall temperature distribution of the liquid hydrogen container is monitored in real time, thermophysical parameters are calibrated through the LSTM neural network by adopting a dynamic calibration algorithm, and the output result of the three-dimensional heat flow field model is corrected. By establishing a three-dimensional heat flow field model of the liquid hydrogen container, determining a nonlinear response relationship between the evaporation rate and the pressure rising rate of the liquid hydrogen container, and constructing a cloud-edge collaborative detection system, the heat leakage performance of the liquid hydrogen container is accurately predicted, and efficient pressure rising rate detection is realized.

Low-pressure oil enters an inlet of a proportional overflow valve, the pressure of a low-pressure system is controlled by the proportional overflow valve, pressure oil on the low-pressure side acts on a plunger control cavity of the hydraulic control overflow valve through a pressure stabilizing damper and a one-way valve, and hydraulic pushing force generated by a plunger is transmitted to an overflow valve steel ball through a disc spring; when the force obtained by multiplying the ultrahigh pressure of the inlet of the hydraulic control overflow valve by the action area of the steel ball is equal to the pushing force of the plunger, the steel ball of the overflow valve is opened to start overflowing, and the overflow pressure of the ultrahigh pressure system can be controlled by adjusting the pressure of the proportional overflow valve of the low-pressure system. The external control type ultrahigh-pressure proportional pressure regulating valve can be used for pressure regulation of a hydraulic system with the pressure being 200 MPa or above and can be used as a proportional overflow valve of an ultrahigh-pressure hydraulic system. By arranging a hydraulic loop of two auxiliary oil ports of the external control type ultrahigh pressure proportional pressure regulating valve, the pressure rising one-way proportional regulating function, the pressure unloading function and the pressure rising / falling two-way proportional regulating function of an ultrahigh pressure system can be achieved.

The invention relates to a gas injection device of a foaming injection molding machine, and belongs to the technical field of injection molding machines. The gas injection device comprises a gas source; a pressure reducing valve; an air inlet one-way valve; injecting air cylinders; a gas injection piston; the connecting rod mechanism is used for connecting the gas injection piston and the injection screw rod; the gas injection head is communicated with the gas storage chamber and the injection charging barrel; the gas injection one-way valve is located between the gas injection head and the gas injection cylinder, and gas in the gas storage chamber enters the injection charging barrel in a one-way mode through the gas injection one-way valve; and when the injection screw retreats in a pre-plasticized mode, the gas injection piston is driven by the connecting rod mechanism to slide in the gas injection cylinder, the volume of the gas storage chamber is compressed, after the gas pressure rises to exceed the melt pressure, the gas injection head is opened, and inert gas enters the injection charging barrel through the gas injection head. The gas injection system is simplified, the gas injection flow and pre-plasticizing of the injection screw are synchronously carried out, and the manufacturing cost of equipment is reduced.

The invention belongs to the technical field of valves, and particularly discloses a self-pressure-control cut-off ball valve which comprises a valve shell, a sealing cavity is formed in the middle of the interior of the valve shell, a spherical valve element is rotationally arranged in the middle of the inner wall of the sealing cavity in a sealed mode, the middle of the spherical valve element is in a through opening shape, and an indicating groove is formed in the bottom of the valve shell. When pressure in a pipeline rises, the transmission assembly can be triggered in the valve shell to work so that the spherical valve element can rotate, then the valve shell is opened and conducted, the transmission assembly can be further driven to work along with pressure rising, and when the maximum pressure value of the valve is reached, the transmission assembly can be driven to rotate, so that the transmission assembly can be driven to rotate. At the moment, the opening degree of the spherical valve element in the valve shell is in the maximum state, the limiting assembly is triggered to limit the transmission assembly at the moment, the situation that the spherical valve element continues to rotate, and consequently the opening degree is decreased is prevented, and opening and closing of the valve can be automatically adjusted according to changes of the pressure in the pipeline.

To provide a fuel pump and fuel injection system that can pressurize a plurality of kinds of fuels in a simple structure.SOLUTION: A fuel pump 10 comprises a first piston 16, a first pressure rising chamber 11, a second piston 21, and a second pressure rising chamber 12a. The first piston 16 is reciprocated by being pushed by a cam 13. The first pressure rising chamber 11 houses a first fuel to be pressurized by the first piston 16, and comprises a first discharge hole 18 for discharging the first fuel. The second piston 21 is reciprocated by being pushed by the first fuel pressurized by the first piston 16. The second pressure rising chamber 12a houses a second fuel to be pressurized by the second piston, and comprises a second discharge hole 23 for discharging the second fuel.SELECTED DRAWING: Figure 1

The utility model relates to the technical field of detection devices, and discloses a collection device for gas detection, which comprises a shell, a sliding plate is slidably mounted in the shell, two rectangular columns are fixedly mounted at the top of the sliding plate, tooth grooves are respectively formed in the right sides of the two rectangular columns, a mounting groove is formed in the right side of the shell, and the tooth grooves are fixedly mounted in the mounting groove. A rotating rod is rotationally mounted on the inner wall of the mounting groove, and the outer wall of the rotating rod is fixedly sleeved with a door plate and a first gear. When a rectangular column moves upwards, linear motion is efficiently converted into rotation motion of a gear through a meshing mechanism of a tooth groove and the gear, and it is ensured that a door plate can rapidly and stably rotate so as to respond to internal air pressure changes. The rotating angle and speed of the door plate can be accurately controlled, and when too much gas is collected in the shell and the gas pressure rises to a certain degree, the door plate can automatically rotate to open the gap.

The invention relates to the field of axial flow fans, and discloses an axial flow fan and a range hood comprising the axial flow fan, the axial flow fan comprises a shell, a rotating shaft, a blade assembly, a front mounting piece and a front suspension supporting plate, the blade assembly is arranged in a blade flow channel formed between the rotating shaft and the shell, and the front mounting piece is rotationally connected to the upstream end of the rotating shaft; the front suspension supporting plate is fixedly connected with the front installation piece and the shell, the thickness of the rear portion of the front suspension supporting plate is gradually reduced in the first direction, the thickness of the windward side in the portion, with the radius larger than the minimum radius of the upstream end of the blade flow channel, of the rear portion is larger than the thickness of the leeward side, and the windward side is provided with a bias flow section. The included angle between the contour tangent line of the bias flow section on the equal-radius face and the first direction is negative, so that fluid deflects relative to the axial direction after flowing through the front suspension supporting plate and then flows to the blade assembly, and the pressure rise efficiency of the axial flow fan is improved.

The invention discloses a multi-mode cooperative intelligent forming control system, particularly relates to the field of production strategy control, and is used for solving the problems that a control strategy is difficult to dynamically adjust according to different mold characteristics in an existing mold forming process, and intelligent matching cannot be realized due to forming period section division. A preloading module is used for collecting mold press-fitting displacement parameters and a thermal response curve in a forming period, a response hysteresis analysis module is used for analyzing stress response and structural deformation absorption capacity of a mold, a thermal inertia analysis module is used for identifying a mold thermal inertia window, and a section division strategy space of the current forming period is jointly constructed; and time sequence boundaries of the pressure rising section, the pressure stabilizing section and the cold conversion section are set through the control module, and accurate control over the forming process is achieved. The system further constructs a biaxial parameter space based on a hysteresis attribute and a thermal inertia window through a strategy space updating module, executes strategy updating, and forms a strategy adjustment network capable of adapting to the multi-mode collaborative processing process.

The invention discloses a high-stability ultra-long main shaft of a numerical control machine tool. The high-stability ultra-long main shaft comprises a shell I, a shell II and a rotating shaft, the first shell and the second shell are combined to form a main shaft shell, the rotating shaft penetrates into the main shaft shell, and a plurality of bearings are installed at the two ends of the rotating shaft. A first mounting part, a hollow part and a second mounting part are arranged in the main shaft shell, the hollow part at least accounts for 1 / 2 of the length of the main shaft shell, the first mounting part and the second mounting part are each provided with two clamping positions used for fixing bearings at intervals, and a sound sensor or / and a vibration sensor is / are arranged between the two clamping positions and used for detecting the states of the two bearings; the two opposite bearings located on the first installation part and the second installation part are located on the two sides of the hollowed-out part respectively, the hollowed-out part is defined to form a closed space, the first shell and the second shell are each provided with an air channel, one end of each air channel is connected with the hollowed-out part, and the other end of each air channel extends to the surface of the first shell and the surface of the second shell to be connected with an air nozzle. Gas is pumped out to form negative pressure in the hollow-out part, gas disturbance generated during rotation of the rotating shaft is reduced, gas in the hollow-out part is pumped out from the gas channel through an external device, negative pressure is formed in the hollow-out part, gas disturbance generated during rotation of the rotating shaft can be reduced, and the conditions of pressure rise caused by gas thermal expansion and the like can be reduced; and the stability of the spindle is further improved.

The invention relates to the technical field of ascites drainage, in particular to an ascites drainage device which comprises a puncture tube, the output end of the puncture tube is fixedly connected with a one-way valve, the output end of the one-way valve is fixedly connected with a separation tube, a drainage opening is formed in the bottom of the separation tube, and the output end of the drainage opening is fixedly connected with a drainage tube. The output end of the drainage tube is fixedly connected with a liquid accumulation bag, a filter cartridge is arranged in the separation tube, and the input end of the filter cartridge is communicated with the input end of the separation tube. The spiral flow deflectors which are uniformly arranged along the central axis are arranged at the input end of the filter cartridge, so that ascites can be guided to form a spiral flowing state, and solid substances are always kept in dynamic distribution of'spirally advancing along the wall 'by virtue of centrifugal force; meanwhile, when the filter cartridge is blocked and the pressure rises to a preset value, the second T-shaped piston rod can extrude the titanium alloy spring to slide, so that ascites enters the hole-free groove to expand the internal space of the filter cartridge, the pressure is balanced, and time is bought for cleaning blockages.

The invention relates to a space-ground consistency evaluation method for average pressure in a rocket interstage separation pressure building process. The method comprises the following steps: for the rocket interstage separation pressure building process, calculating pressure rising speeds of a temperature rising section and a temperature stable section of an engine flight test state; under the determined detonation gas product total enthalpy condition, the product of the outlet section flow and the total enthalpy is close to the flight test state, and the outlet flow required by the test is obtained; according to the outlet flow, the pressure rising speed of the rocket engine ground simulation device in the pressure building process is evaluated, and it is confirmed that the difference between the pressure rising process of the ground simulation device and the flight test state is within the engineering application deviation requirement; evaluating the working environment of the ground simulation device; and evaluating the over-assessment degree of the pressure rising speed of the ground simulation device in the pressure building process compared with the flight test state. Flight state equivalent simulation of an internal environment and an external environment in a ground test scheme is realized, so that the ground test can reasonably verify a real pressure building process of inter-stage thermal separation in a multi-stage rocket flight test.

The invention discloses a rocket attitude control method and related equipment, and relates to the technical field of attitude control, and the method comprises the steps: obtaining a rolling attitude angle of a rocket; generating a control instruction according to the deviation between the rolling attitude angle and the target attitude angle; and on the basis of the control instruction, electromagnetic valves of at least one pair of symmetrically-arranged cold air spray pipes are controlled to be opened and closed so that high-pressure gas can be released to generate thrust, the posture is adjusted to the target posture angle, the high-pressure gas is supplied through a pressure reducing valve, and a buffering electromagnetic valve and a buffering hole plate are arranged in front of the pressure reducing valve so that the pressure rise rate in front of the pressure reducing valve can be controlled not to exceed a preset threshold value. The combined structure of the buffer electromagnetic valve and the buffer pore plate is arranged in front of the pressure reducing valve, the pressure rise rate of high-pressure gas is dynamically adjusted, it is ensured that the pressure change of an inlet of the pressure reducing valve is always lower than the preset threshold value, and the pressure impact problem caused by rapid opening and closing of the electromagnetic valve is effectively restrained.

The invention discloses an engine multi-vehicle-type adaptive NVH quality optimization method and system, and belongs to the technical field of automobile engine debugge.The method comprises the steps that after an engine is installed on a to-be-adapted vehicle, vehicle working condition data are collected in real time, the vehicle working condition data comprises a vehicle speed, an accelerator opening degree, an engine rotating speed, a gear, a hydraulic torque converter locking state and an engine oil temperature signal; the vehicle working condition data is compared with the working condition of the engine noise sensitive working condition, and whether the engine noise sensitive working condition is entered or not is recognized; when the engine has the noise sensitive working condition, an NVH control strategy embedded in an engine electronic control unit is activated; the NVH control strategy comprises adjustment of an engine ignition angle and oil injection parameters; the engine is controlled according to the ignition angle optimization control instruction and the oil injection parameter optimization instruction; and when the vehicle runs out of the working condition of the noise sensitive working condition of the engine or gear shifting is completed, the conventional combustion control logic is recovered. And the rising rate of the pressure in the cylinder is effectively reduced, so that the structural knocking noise within the range of 150-600Hz is inhibited.

The invention relates to the technical field of transportation devices, and discloses a coated glass carrying control method and system, and the method comprises the steps: respectively collecting surface reflection spectrum data, dimension specification parameters and carrying force arm information; extracting film layer combination characteristics, and carrying out bearing capacity calculation by combining dimension specification parameters and carrying force arm information to obtain a theoretical stress extreme value; acquiring a pressure rise rate and a steady-state leakage rate, and performing airtight characteristic inversion on the coated glass based on the pressure rise rate and the steady-state leakage rate to obtain an interface adsorption efficiency value; carrying out constraint boundary fusion on the theoretical stress extreme value and the interface adsorption efficiency value to obtain a double constraint envelope; time sequence deduction is conducted on the mechanical arm based on double constraint envelope, and a space motion time sequence is obtained; a self-adaptive inertia carrying instruction is generated based on the space motion time sequence; the carrying stability of the coated glass can be improved.

The invention discloses a furnace tube air outlet structure and method for improving film thickness uniformity and a furnace tube device. The initial size of each air outlet formed in a first process tube of an existing furnace tube is adjusted; the adjusted size of the air outlet hole is gradually reduced from any end of the first process pipe to the middle direction in the axial direction until the minimum adjusted size is intersected at one air outlet hole between the two ends of the first process pipe, so that the partial pressure of the process gas at the two ends of the first process pipe in the process is reduced; the problem of pressure rise at the two ends of the first process pipe due to the load effect is balanced, the pressure control stability of the furnace pipe process can be improved, the film thickness of a deposited film layer and the stability of components are improved, and therefore the uniformity between film thickness pieces of products in the same furnace can be effectively improved.

An automated vacuum container can include a main body, lid, valve(s), automated pump, processor, and input device(s). The main body can have an outer housing, sealable opening, and inner volume. The lid can be removably coupled to the main body to cover the sealable opening and can include air passage(s) therethrough. Valve(s) can control airflow through air passage(s). as air is pumped from the inner volume to form a vacuum. The processor can operate in sleep and awake modes, receive input(s), and control pump operation. An input device can send a wake up signal to the processor based on an environmental condition change. Pressure sensor(s) can detect pressure within the inner volume and provide input to the processor. The pump can be stopped when pressure is sufficiently low and restarted when pressure rises above a threshold level, such as when stored perishable item(s) outgas under vacuum within the inner volume.

The high-pressure hydrogen storage cylinder sealing structure comprises a plastic inner container, a cylinder valve seat and a locking nut, the cylinder valve seat is located at a cylinder opening of the plastic inner container, the locking nut is in threaded connection with the cylinder valve seat, and extrusion sealing is formed among the locking nut, the plastic inner container and the cylinder valve seat. The sealing device is simple in structure and convenient to install, the multi-sealing effect can be achieved by tightening the locking nut, the air tightness of connection between the plastic inner container and the metal valve seat can be guaranteed, the failure probability is reduced, and the sealing reliability is improved; by arranging the structure with the rotation stopping function and adopting the structure that the plastic inner container wraps the shoulder of the cylinder valve seat, the combination effect of the plastic inner container and the cylinder valve seat is promoted, the connection strength and the overall stability of the structure can be improved, it is guaranteed that the plastic inner container and the cylinder valve seat cannot be separated under the long-term working state, and the service life of the cylinder valve seat is prolonged. Potential safety hazards caused by pressure rise after the hydrogen storage cylinder is inflated are avoided, and the service life and the safety of the hydrogen storage cylinder are effectively prolonged and improved.

The utility model provides an energy storage battery cluster and an energy storage system, and relates to the technical field of energy storage. The energy storage battery cluster comprises a plurality of battery packs, a detection pipeline and a pressure detection unit; the detection pipeline is respectively connected with the plurality of battery packs; the pressure detection unit is connected with the detection pipeline. When any one battery pack is subjected to thermal runaway, gas in the battery pack is heated to expand, so that the pressure in the detection pipeline is increased. The pressure detection unit is used for detecting the pressure in the detection pipeline so as to judge whether thermal runaway of the battery pack occurs or not, and the thermal runaway is used as a basis for the fire-fighting host to start whole cluster fire fighting. And the states of a plurality of battery packs can be monitored only by arranging one pressure detection unit, so that the cost is lower. The pressure detection unit can be used in cooperation with a temperature probe of the BMS in the battery pack, and the reliability is higher. In addition, the pressure detection unit is arranged outside the battery pack, so that maintenance and replacement are facilitated, and the after-sales difficulty is reduced.

The invention relates to the technical field of product detection, in particular to a plastic mold production quality detection method and system. The method comprises the following steps: acquiring in-mold pressure data of each cavity of the multi-cavity mold in a plastic injection molding process and mold wall temperature data of a cooling stage; determining a pressure rise acceleration curve based on the in-mold pressure data of each cavity; based on the pressure rising acceleration curve and a preset fluctuation threshold value, a filling fluctuation index of the melt filling stage is determined; based on the mold wall temperature data, a cooling hot spot index of a cooling stage is determined; and comparing the filling fluctuation index with a filling fluctuation threshold value, and comparing the cooling hot spot index with a cooling hot spot threshold value to obtain a detection result of the production quality of the plastic mold. The objective of the invention is to solve the problem of early cracking, deformation or structural failure of a product caused by difficulty in accurately detecting the product produced by a plastic mold in the prior art.

The utility model relates to the technical field of vehicle accessories, in particular to an expansion kettle which is characterized in that when the expansion kettle is used, the position of a mounting bracket on a cross beam is adjusted according to requirements, then the mounting bracket is fixed, filling is performed through a liquid inlet, and discharging is performed through a liquid outlet. When the pressure in the kettle body rises to exceed the pressure relief value of the safety valve or liquid in the kettle body overflows due to other reasons, the liquid can flow out of the kettle body through the exhaust pipe, so that the flexibility and the safety are improved; comprising a kettle body, a liquid inlet is formed in the side surface of the kettle body, a liquid outlet is formed in the bottom surface of the kettle body, a mounting bracket is arranged on the side surface of the kettle body and is fixedly and slidably connected with a cross beam, the kettle body is provided with a safety valve, and the safety valve is connected with an exhaust pipe.

The invention provides a stall boundary prediction method and device of a gas compressor, electronic equipment and a storage medium, and relates to the technical field of pneumatic design of gas compressors. The method comprises the steps that through-flow calculation is conducted on the gas compressor, and a through-flow calculation result is obtained; according to the through-flow calculation result, stage static pressure rise coefficients and diffusion factors of different blade height sections of the gas compressor are determined; according to the stage static pressure rise coefficients and the diffusion factors of the different blade height sections, the first stall section is determined from the different blade height sections; determining a limit value which can be reached by the stage static pressure rise coefficient of the first stall section; and in response to the fact that the stage static pressure rise coefficient of one stage on the first stall section reaches the limit value, it is predicted that the compressor reaches the stall boundary. Therefore, according to the scheme, the prediction precision and the prediction speed of the stall boundary of the gas compressor are improved, so that rapid and accurate prediction of the stall boundary of the gas compressor is realized.

The invention provides a blowout control method based on wellhead methane adsorption, which comprises the following steps of: compounding a methane adsorption material with other necessary drilling fluid additives to form high-density composite well killing fluid in a key stage (namely when well control dangerous conditions such as overflow or well kick occur) before blowout; and then, at the position 100-200 m below a well mouth, the composite well killing fluid is injected into a shaft through special well killing fluid injection equipment according to preset injection parameters. According to the method, slipping and rising of methane bubbles invading a shaft are effectively restrained through the high density of well killing fluid, meanwhile, methane gas in the shaft is adsorbed in real time through a methane adsorption material compounded in the well killing fluid, gas column expansion and pressure rising are effectively controlled in the early stage of gas invasion through the dual-action mechanism of density suppression and active adsorption, and the gas invasion safety is effectively improved. Therefore, blowout is prevented or development of blowout is restrained.

The invention relates to a hydrogen-diesel oil dual-fuel single-cylinder engine heavy-load working condition combustion control system and method, belongs to the technical field of engines, and is characterized in that an air inlet pressure sensor is mounted near an air inlet valve, a control valve is mounted in an air inlet channel, an electric supercharger and an intercooler are connected to the other air inlet channel in series, and a temperature sensor is mounted; a pressure sensor, a hydrogen sprayer and an oil sprayer are installed in the combustion chamber, and the hydrogen sprayer, the oil sprayer, the electric supercharger, the control valve, the air inlet pressure sensor, the pressure sensor, the intercooler and the temperature sensor are connected with a vehicle-mounted computer at the same time. The control over the pressure rising rate and the pressure fluctuation of the hydrogen-diesel oil dual-fuel single-cylinder engine under the large-load working condition is achieved by adjusting the air inlet supercharging pressure and the fuel injection control strategy, and the problem of abnormal combustion under the large-load working condition is solved.

A method includes opening a flow path from a gas stick through a variable orifice, a chamber, and an outlet isolation valve of the chamber. The method further includes causing a gas to flow through the flow path at a flow rate setpoint. The method further includes actuating an opening of the variable orifice to establish a choked pressure regime within the chamber, the choked pressure regime being achieved by causing a first pressure upstream of the variable orifice to be at least two times a second pressure downstream of the variable orifice. The method further includes closing the outlet isolation valve to cause the chamber to be filled with the gas from the gas stick. The method further includes measuring a pressure rate-of-rise within the chamber. The method further includes determining one or more flow measurements based at least in part on the pressure rate-of-rise.

The invention relates to the technical field of hydraulic machines, and particularly discloses an oil press which comprises a liquid filling mechanism and a hydraulic mechanism connected with the liquid filling mechanism. The hydraulic mechanism comprises a main oil cylinder, a base, a top beam and a movable plate installed between the base and the top beam, a plurality of guide columns are installed between the base and the top beam, the movable plate is installed on the guide columns in a reciprocating motion mode, and a telescopic rod body is further arranged at the end, close to the base, of the movable plate. The telescopic rod body is used for assisting in driving the movable plate to reciprocate between the base and the top beam; the main oil cylinder is installed below the base, the guide column is of a cavity structure and communicated with the main oil cylinder, the liquid filling mechanism is used for rapidly filling liquid into the main oil cylinder, the main oil cylinder drives pressure in the guide column to rapidly rise after being filled with the liquid, and the pressure in the guide column rises to drive the movable plate to get close to the top beam to conduct compression machining operation on a product to be machined.

The invention relates to a linked polyethylene insulated power anti-interference control cable which sequentially comprises a wire core, a filling layer, a shielding layer, an armor layer and a rubber layer from inside to outside and further comprises a machine shell. The first air pressure sensor outputs a detected air pressure rising signal, and the air pressure rising signal is essentially a key indirect temperature abnormity indication signal. As the temperature sensor directly reflects that the temperature of the local armor layer area exceeds the threshold temperature of particle decomposition, an external system sends out an overheat alarm after receiving the signal, and an operator is prompted to troubleshoot a fault point. The thermal decomposition particles filled in the metal tube in the armor layer are utilized to convert the local high temperature of the armor layer / rubber layer junction area which is difficult to directly measure into visible gas generation amount change, and then the visible gas generation amount change is converted into an accurate gas pressure signal through the closed cavity.

The invention relates to a production string leakage positioning method. The method comprises the steps that an initial pressure stable value of an oil sleeve annulus and a pressure fluctuation value of the oil sleeve annulus are obtained; calculating a pressure fluctuation threshold value of the oil jacket annulus according to the initial pressure stable value and the sensor monitoring error; the pressure fluctuation value is compared with a pressure fluctuation threshold value, and whether a new leakage point appears or not is judged; if no new leakage point appears, the depth of the leakage point is calculated according to the U-shaped pipe pressure balance principle, and a positioning result is obtained; and operating oil pressure fluctuation based on a positioning result to obtain an oil pressure fluctuation calculation value, and comparing the oil pressure fluctuation calculation value with an actually-monitored oil pressure fluctuation monitoring value to judge the positioning reliability. According to the method, the leakage point position is determined and the positioning result is verified by judging the state of the leakage point of the production pipe column in advance, so that the positioning precision is improved, the leakage pressure rising phenomenon of the production pipe column is effectively controlled, and the working efficiency is improved.