95 results about "Pressure range" patented technology

This invention belongs to the field of flexible sensor technology, and particularly relates to a multilayer porous flexible pressure sensing film and its preparation method. Addressing the problems of insufficient sensitivity and limited detection range in existing flexible pressure sensors, this application provides a multilayer porous flexible pressure sensing film. This film significantly improves the pressure sensing sensitivity of flexible pressure sensors, producing differentiated capacitance change responses under different pressures, achieving high-precision detection; it expands the detection pressure range, exhibiting good response linearity across the low-pressure to high-pressure range, enabling wide-range continuous monitoring; it shortens the sensor's response recovery time, improves dynamic response performance, and enhances signal cycle stability, meeting the application requirements of real-time dynamic monitoring.

The invention relates to a method for pressure sensor diagnosis in a fuel tank ventilation system of a motor vehicle operated by an internal combustion engine, wherein the fuel tank ventilation system has an activated carbon filter, a flushing line arranged between the activated carbon filter and an air intake tract of the motor vehicle, a fuel tank ventilation valve arranged in the flushing line, and a pressure sensor arranged in the flushing line, and wherein the method comprises the following steps: - measuring a prevailing pressure in the flushing line by means of the pressure sensor to determine a starting pressure, - classifying the starting pressure to one of a plurality of pressure ranges depending on the amplitude of the starting pressure, - performing a pressure sensor diagnosis using a diagnosis algorithm assigned to the pressure range in which the starting pressure lies.

This invention discloses a method and apparatus for correcting coefficients in blast furnace charge tank weighing calculations. By dividing the material into different weight groups and defining different furnace top pressure ranges based on the number of weight groups, the method of corresponding different furnace top pressures to different weight ranges is used to calibrate the charge tank weighing system online, correcting relevant parameters in the blast furnace charge tank weighing system. This solves the problems of drift, nonlinearity, and abrupt changes in the charge tank weighing system caused by various factors during the charging process in the prior art, enabling the charge tank weighing system to be dynamically calibrated online, thus achieving the technical effect of improving the accuracy of charge tank weighing data.

The application belongs to the field of optical fiber cables, and specifically discloses a production method of a hollow-core fiber hybrid cable, a product and equipment thereof, and the production method comprises the following steps: S1, connecting a pressure filling device to the exposed end of a hollow-core fiber wound on a fiber reel, keeping the pressure of the pressure filling device within a set pressure range until the air pressure in the hollow core of the hollow-core fiber is balanced, ending the pressure filling, and then plugging the exposed end of the hollow-core fiber to obtain a pressure-filled hollow-core fiber; and S2, placing the fiber reel of the pressure-filled hollow-core fiber on a wire rack with a heating and heat preservation function, and releasing the pressure-filled hollow-core fiber into an extruder to perform cabling. The application further provides the above hollow-core fiber hybrid cable production equipment. The method and equipment can solve the pollution problem of the air core of the hollow-core fiber hybrid cable and improve the production quality of the hollow-core fiber.

The present application relates to the technical field of industrial data security management, in particular to a drilling site safety operation process digitization management method and system, comprising the following steps: collecting sampling time, rotating speed, drilling pressure, standpipe pressure and writing in alignment, comparing drilling pressure with interval and checking rotating speed and pressure range, extracting difference value and checking change threshold value, writing in parallel determination label and sorting, counting abnormality and checking threshold value to generate management account book. In the present application, through the alignment and sequential writing of sampling time, rotating speed, drilling pressure, standpipe pressure, ticket number, shift and well section, discrete parameters form continuous operation link and the abnormal time and attribution are clear, combined with drilling pressure interval, rotating speed range and pressure range synchronous checking, the multi-parameter parallel constraint relationship is constructed, the composite abnormal positioning is realized, the adjacent difference value and continuous window verification are superimposed, the mutation and cumulative deviation can be identified, the interval mismatch and continuous change are determined in parallel and recorded by time, and the identification accuracy and management consistency are improved.

The present application relates to the technical field of planetary gear set, and particularly relates to a flexible meshing method and device of planetary gear set and gear ring. The flexible meshing device comprises a clamping device, a force sensing device and a displacement moving device, and a control device is connected with the force sensing device and the displacement moving device respectively, and the control device is used for controlling the displacement moving device to execute the flexible meshing method according to the force and torque detected by the force sensing device. In the flexible meshing method of the planetary gear set and the gear ring, a six-dimensional follow-up coordinate system is established, and the axial pressure, torque and force difference are combined for closed-loop control in the processes of centering, axial approach, rotation tooth searching, attitude adjustment and tooth meshing, so that the planetary gear set and the gear ring no longer rely on manual tooth adjustment or rigid press fitting, but automatically search for the tooth groove and adjust the attitude in the safe pressure range, thereby reducing the risk of knocking and scratching caused by tooth top and tooth surface interference, and improving the automation degree, assembly success rate and assembly consistency of the meshing assembly.

The application discloses a method for determining key process parameters in a chamber vacuum pumping and breaking process. ‑5 The pressure range of the method is 10 5 Pa, covering more than 10 orders of magnitude. The method divides the vacuum chamber pumping and breaking process into different flow intervals by using a modified Knudsen number as a partition criterion, and solves the process in segments by using a k-omega shear stress transport turbulence model, a laminar flow+velocity slip model, a free molecule flow model and a coupled ordinary differential equation model. Wide pressure range coupling calculation is realized through data transmission between modules. At the same time, the method considers material outgassing and leakage to obtain pressure-time evolution results that are more in line with actual working conditions. The method can provide reliable basis for vacuum chamber pumping and breaking scheme design, pump matching, material selection and process optimization.

This utility model relates to the field of online analyzer technology and discloses a back pressure balancing system for an FTA analyzer, including an FTA analyzer, a back pressure balancing system, and a flare. The FTA analyzer is connected to the back pressure balancing system via an outlet pipe. One end of a return manifold is connected to the outlet pipe, and the other end is connected to the flare. A pneumatic pump is installed on the return manifold. A differential pressure flow meter is installed on the return manifold between the FTA analyzer and the pneumatic pump, with its other end connected to the return manifold between the FTA analyzer and the differential pressure flow meter, and the other end connected to the pneumatic pump. The control system is connected to the drive gas pipeline and the differential pressure flow meter. This utility model can reduce the pressure of the high-pressure gas discharged from the FTA analyzer, maintaining the discharged gas within a normal pressure range, enabling stable discharge of high-pressure gas. It solves the problem of high and fluctuating pipeline pressure preventing the discharge of exhaust gas after instrument analysis, improving system reliability and ensuring the long-term stability and maintainability of the system.

A method for preventing overspeeding and black smoke emission from a four-stroke marine engine under all operating conditions is disclosed, relating to the field of four-stroke marine engine control technology. This method addresses the problem of existing technologies failing to achieve full-condition fuel quantity limitation and exhibiting low control precision, leading to black smoke emission from the engine. The method involves collecting a 4-20mA current signal corresponding to the boost air pressure as the main engine load feedback signal; connecting this signal to the electronic speed controller via a shielded anti-interference link; setting fuel quantity limitation parameters according to eight speed ranges and at least eight load points in each range within a speed range of 200-1080 r / min and a boost air pressure range of 10-200 kPa, and periodically calibrating these parameters; dynamically adjusting the fuel supply using a PID control algorithm to predictively prevent speed deviations; and incorporating an abnormal alarm and a local + cloud encrypted storage module. The beneficial effects are: ensuring the engine speed remains stable within a safe range and avoiding black smoke emission caused by excessive fuel quantity under different operating conditions.

The utility model provides a positive and negative pressure protector, which relates to the technical field of positive and negative pressure protectors, and comprises two cylinders which are connected up and down, the upper cylinder is an upper cylinder, and the lower cylinder is a lower cylinder; the two liquid sealing structures are respectively an upper liquid sealing structure and a lower liquid sealing structure, the upper liquid sealing structure is arranged at the lower end of the upper cylinder body, and the lower liquid sealing structure is arranged at the lower end of the lower cylinder body. The air exhaust device has the advantages that the upper liquid sealing structure and the lower liquid sealing structure are arranged to form the pressure space, the upper floating cover is pushed to ascend through pressure, meanwhile, the lower floating cover is pressed to exhaust air, the upper floating cover is tensioned through negative pressure, and meanwhile the lower floating cover is drawn to ascend to suck air; the meshes are formed in the upper ends of the upper central pipe and the lower central pipe, and a distance exists between the height of the meshes and the anti-freezing liquid of the liquid seal, so that airflow cannot directly impact the anti-freezing liquid, the air resistance is small, the pressure is stable, and the anti-freezing device can be suitable for a lower pressure range.

A method for performing a pressure control in a gas phase reactor system, a control system for executing the method for performing the pressure control in the gas phase reactor system, and the gas phase reactor system are provided. The method comprises a second-valve adjustment step, in which an opening pressure of a second valve for discharging a discharge mixture from a gas phase reactor to a recovery area is adjusted to a value equal to or higher than an opening pressure of a first valve for the supply to the gas phase reactor. Thereby, the gas phase reactor can be operated in a pressure range between the first-valve opening pressure and the second-valve opening pressure, and a workload placed on the recovery area of the gas phase reactor system is decreased.

This utility model relates to the field of tea seed oil deodorization, and discloses a deodorizing pot for tea seed oil, including a base, a deodorizing pot body fixedly connected to the top of the base, a top ring fixedly connected to the top of the deodorizing pot body, a sealing component provided on the inner wall of the top ring, the top ring being connected to a top cover through the sealing component, a servo motor fixedly connected to the bottom of the inner wall of the top cover, the drive end of the servo motor penetrating the inner wall of the top cover and fixedly connected to a rotating column, a first gear fixedly connected to the inner wall of the rotating column, a second gear meshing with the outer wall of the first gear, and a vent pipe fixedly connected to the inner wall of the second gear. In this utility model, the sealing component improves the sealing performance between the pot cover and the pot body, ensuring that the inside of the deodorizing pot can be maintained stably and continuously within the required vacuum or specific pressure range, and maximally preventing the high-temperature steam generated during the deodorization process from escaping from the connection between the pot cover and the pot body.

A system comprises a fluid supply, a pressure regulator, a pressure valve, and a vent assembly. The fluid supply stores a volume of a fluid and is fluidly coupled to an outlet tube. The outlet tube is configured to be fluidly coupled to at least a portion of an organ environment. The organ environment configured to hold an organ. The pressure regulator is fluidly coupled to the outlet tube and is configured to maintain a fluid pressure of the fluid being supplied to the organ environment from the outlet tube. The fluid being supplied is at a pressure range above ambient to maintain the organ in an inflated position. The pressure valve is fluidly coupled to the outlet tube and inhibits increase of the fluid pressure above a threshold. The vent assembly removes excess fluid from the organ environment and includes a vent tube disposed within the organ environment and a vent valve disposed outside of the organ environment.

This invention provides a method and apparatus for measuring the dew point pressure of shale condensate gas, belonging to the field of natural gas extraction technology. The method includes: raising the temperature of a core holder to a preset temperature; injecting condensate gas into the core holder to a first preset pressure; after a preset time, reducing the pressure of the core holder to a second preset pressure according to a first preset change amount, while simultaneously acquiring the acoustic transit time of the core under different pressures; determining the dew point pressure range of shale condensate gas based on the acquired acoustic transit time; injecting condensate gas into the core holder to the maximum pressure value within the dew point pressure range; after a preset time, reducing the pressure of the core holder to the minimum pressure value within the dew point pressure range according to a second preset change amount, while simultaneously acquiring the acoustic transit time of the core under different pressures; and determining the dew point pressure of the shale condensate gas based on the newly acquired acoustic transit time. This invention is simple to operate, provides accurate measurement results, and can provide a technical basis for the efficient development of shale condensate gas reservoirs.

The invention relates to a high-pressure cleaning device (1) comprising a main line (5) through which liquid can be pumped by means of a high-pressure pump (3), an operating device (7) that generates a control signal dependent on an actuation, in particular on a degree of actuation, of the operating device (7), and a pressure adjusting device (25) that adjusts the pressure in the main line (5) based on the control signal. In a normal mode of the high-pressure cleaning device (1), the pressure in the main line (5) can be adjusted within a normal pressure range by means of the pressure adjusting device (25). During actuation of the operating device (7) in normal mode, the high-pressure cleaning device (1) can be switched to a special mode by means of an operating mode signal. In special mode, a setpoint is determined from one or more control signals and the setpoint is stored, at least temporarily.In special mode, the pressure in the main line (5) can be adjusted within a special pressure range using the pressure adjusting device (25). This special pressure range is limited compared to the normal pressure range. The special pressure range is determined using the setpoint.

The application discloses a kind of compressed air energy storage cavern operating pressure determination method, comprising the following steps: establishing the elastic mechanics plane strain model of surrounding rock-lining-sealing layer composite structure, deducing the analytical solution of elastic stress and displacement of composite structure;Determine the upper limit of cyclic internal pressure;Introduce the spatial heterogeneity function of surrounding rock parameter, deduce the elastoplastic stress and plastic zone radius expression of composite structure;Introduce the fatigue damage evolution equation to correct rock mass strength parameter, based on the plastic zone radius control condition, solve lower limit pressure.The method can simultaneously utilize initial geostress to constrain surrounding rock deformation and quantify the attenuation of rock mass parameters caused by long-term cyclic loading, while ensuring that surrounding rock does not produce tensile failure and the expansion of plastic zone is controllable, the best operating pressure range and amplitude of compressed air energy storage cavern in the whole life cycle of up to 30 years are accurately quantified, so as to ensure the long-term sealing and safety of the structure, effectively optimize the design parameters, and improve the engineering economy.

The application discloses a valve cavity air pressure control method and device and related media, the method comprising collecting a multi-dimensional time series data set, and performing data preprocessing on the multi-dimensional time series data set to obtain a feature engineering data set; the feature engineering data set is divided according to working conditions and pressure segments to obtain a two-dimensional model matrix; a model mapping table is established based on the two-dimensional model matrix to obtain a model switching configuration object; the current cavity air pressure is obtained according to the model switching configuration object, and data comparison is performed to obtain a pressure segment identification result; the pressure segment identification result is used to determine a pressure increase / decrease identifier and / or a pressure adjustment identifier, so that a sub-model of the two-dimensional model matrix is selected for reasoning to generate a control instruction. The pressure increase / decrease identifier and / or the pressure adjustment identifier are determined according to the pressure segment identification result obtained by calculation, so that the sub-model of the two-dimensional model matrix is selected for reasoning to generate the control instruction. In this way, the valve cavity air pressure can be stably and accurately controlled in the full pressure range.

This invention discloses a method for predicting formation pore pressure in fractured reservoirs, relating to the fields of oil and gas exploration and development and geophysical logging technology. The method includes obtaining logging and geological parameters of the target formation; establishing a relationship between pore pressure and fracture aspect ratio based on the effective stress principle and fracture mechanics; calculating the theoretical P-wave velocity under different pore pressure conditions within a pressure range defined by hydrostatic pressure and normal stress on the fracture surface, using an equivalent medium model and the Gassmann equation; determining the pore pressure based on the residual between the theoretical and measured P-wave velocities; and comparing the calculated pore pressure value with the measured pressure value to establish an evaluation relationship. This invention has the advantages of reducing unnecessary and ineffective calculations, improving the stability and speed of the calculation process, and enhancing the physical rationality of the results.

This invention discloses a fault early warning analysis method and system for GIS gas treatment equipment based on the Internet of Things (IoT). The method includes: acquiring pressure waveforms and valve command times; extracting the directional bias features of the response sequence during the inflation phase to obtain the response bias, and obtaining the phase lag angle through nonlinear mapping; defining the pressure holding phase, symbolizing the pressure difference to obtain a symbolic sequence, and obtaining the fluctuation symmetry based on the distribution symmetry of the continuous length of positive and negative signs; calculating the attenuation disturbance factor based on the fluctuation symmetry, pressure holding duration, and pressure range; constructing joint feature points using the phase lag angle and the attenuation disturbance factor; obtaining the feature point cloud distribution boundary under healthy conditions, calculating the deviation of the joint feature points relative to this boundary, and determining the fault type based on the degree and direction of deviation. This invention achieves early fault warning and interpretable classification by extracting two-dimensional joint features of inflation response efficiency and pressure holding stability, reducing the false alarm rate and improving the real-time performance of early warnings.

A segmented inflation control method, device, equipment and computer readable storage medium, comprising: calculating the inflation flow of the object to be tested according to the volume, pre-inflation pressure, inflation duration, pre-set ambient atmospheric pressure, pre-set efficiency coefficient and temperature correction coefficient of the object to be tested; starting the PWM control valve to inflate the object to be tested according to the inflation flow of the object to be tested to determine whether the current inflation pressure of the object to be tested is within the target pressure range; if it is determined that the inflation pressure of the object to be tested is within the target pressure range, switching to the PID controller to continue inflating the current object to be tested to the pre-inflation pressure, solving the technical problems of long inflation duration and low inflation accuracy in related art, achieving fast rough inflation first and accurate fine inflation later, and improving inflation efficiency and pressure control accuracy.

The utility model relates to medical instrument technical field, concretely relates to a sterile dispensing system. The system includes the filter that outputted to the external medicine dispenser connected in proper order on the air path of valve plate and air pump, and the piston of external medicine dispenser is driven to retreat to inhale liquid medicine after air pump suction drive, and the piston of external medicine dispenser is driven to advance to push out liquid medicine after air pump jet drive, the outlet pipe diameter of air pump is 6~12mm, the valve plate air path pipe diameter is 6~8mm, the filter outlet pipe diameter is 4~6mm, and the power of air pump is less than or equal to 200W, and the filter export wind pressure range is positive pressure 0~0.4Mpa, negative pressure less than or equal to -89Kpa. The sterile dispensing system of the utility model, the outlet pipe diameter of air pump, the valve plate air path pipe diameter and the filter outlet pipe diameter three sizes are special design, and experiment verifies that the system local resistance is small, and the airflow flows smoothly, and the system stability is strong, and the reliability is good.

The present invention relates to a method for supplying synthetic yarns (F1-Fn) from a melt spinning and winding apparatus (1), which comprises a melt spinning apparatus (10) configured to extrude synthetic yarns (F1-Fn) and a winding apparatus (20) configured to wind up synthetic yarns (F1-Fn), wherein the yarns (F1-Fn) can be supplied from the melt spinning apparatus to the winding apparatus (40) by a drop chute (30). The supply is adjustable by predetermined pressure ranges (I, II, III) in the suction device (50) of the winding apparatus (40). Furthermore, the present invention relates to an associated winding apparatus.

This invention relates to a pilot valve, comprising a valve body, a valve cover, a pilot valve seat, a mechanical iris mechanism, an adjusting assembly, and a sealing assembly. The mechanical iris mechanism includes a grooved wheel, a slide rail, a flat key, a rotating shaft, an opening screw, a pilot valve cone core, and two sets of sliders. The adjusting assembly includes an adjusting nut, an adjusting rod, a first-position spring, and a second-position spring. In the first position, the pre-compression of the first-position spring is adjusted by the adjusting nut in the adjusting assembly, thereby setting the set pressure. In the second position, after the pilot valve resets, rotating the opening screw causes the rotating shaft to rotate, causing the two sets of sliders to extend outwards. The extended parts of the sliders abut against the lower end of the second-position spring in the adjusting assembly. At this time, the set pressure is determined by the pre-compression of the first and second-position springs, realizing multi-position pressure setting of the pilot valve. This invention applies a mechanical iris mechanism to the pilot valve structure, effectively expanding the set pressure range of the pilot valve, allowing the pilot valve to be applied to hydraulic systems of different pressure levels.

The application discloses an engine lubrication control method, related device and engine, and relates to the field of engine control. The lubrication stage is determined according to the engine speed and the oil inlet pressure. In the first lubrication stage (operation lubrication), the speed and the target speed and the pressure and the first pressure range are compared to determine whether to start the electric oil pump in parallel with the oil pump and to adjust the operation parameters to adapt to the lubrication requirement under low speed. In the second lubrication stage (post-lubrication), the pressure and the second pressure range are compared to determine whether to start the electric oil pump and to adjust the parameters. By reducing the design margin of the oil pump and intelligently compensating by the electric oil pump, the application eliminates the energy waste of the traditional scheme, does not need the oil pressure regulating valve, and integrates the standby, pre-supply and post-lubrication functions of the electric oil pump, thereby greatly improving the system efficiency and integration.

The present application relates to the technical field of fuel cell, and belongs to a kind of fuel cell stack gas pressure and temperature following intelligent control system and method.The present application establishes temperature-pressure-pressure stress coupling model, realizes real-time monitoring and quantitative evaluation to membrane electrode surface pressure stress, solves the problem of " invisible, uncontrollable " in the prior art stress state in stack, provides direct and reliable feedback basis for closed-loop control, eliminates the risk of overpressure damage or poor contact underpressure.At the same time, the working temperature of the stack is associated with the gas pressure, the target gas pressure is dynamically calculated according to the real-time temperature, and the gas pressure is changed by adjusting the speed of air compressor, hydrogen injection rail opening and throttle opening, so as to overcome the problem of stress fluctuation caused by independent control of temperature and pressure in traditional scheme, ensure that the membrane electrode is always in the preset pressure range, and the output performance of the stack and the service life of the membrane electrode are considered.

This invention discloses a precise calibration method and apparatus for pressure sensors, belonging to the field of fluid pressure measurement. The method includes: providing a calibration system comprising a reference tank, on which a reference device and a pressure sensor to be calibrated are mounted; the inlet of the reference tank is connected to a gas source, and the outlet is connected to a standard leak; adjusting the pressure inside the reference tank to the upper or lower limit of the pressure range to be calibrated; opening the channel from the outlet of the reference tank to the standard leak, allowing the pressure to change slowly through the standard leak; during the pressure change process, reading the pressure value of the reference device in real time and writing it correspondingly to the sensor being calibrated, achieving continuous calibration. The pressure change process is controlled according to the formula ΔP=(Q * t) / V, where V is the volume of the reference tank, Q is the leakage rate of the standard leak, t is the leakage time, and ΔP is the pressure change. This invention utilizes the continuity of pressure changes caused by leakage from the standard leak to achieve automatic, continuous, and precise control of the pressure point for pressure sensor calibration. It can perform high-density data acquisition and curve fitting for any range of the sensor, significantly improving calibration accuracy, and the apparatus is simple and low-cost.