12250 results about "Solenoid valve" patented technology

The invention discloses a deep learning-based intelligent optimization method for farmland irrigation water quantity. The method comprises the following steps of S1, obtaining a preprocessed farmland multi-mode perception data set; s2, constructing and training a multi-scale gated SIREN water content continuous prediction model by taking the preprocessed farmland multi-modal perception data set as input; s3, dividing a planned irrigation period into a plurality of time slices, defining a water volume decision vector space and constructing a differential evolution multi-target water volume optimization model; s4, outputting a Pareto optimal water quantity decision vector set meeting a multi-target constraint condition, and selecting an optimal farmland irrigation water quantity from the Pareto optimal water quantity decision vector set according to a user weight or a preset rule; s5, the optimal farmland irrigation water amount is issued to an intelligent valve control system, and an electromagnetic valve is driven to execute irrigation according to time slices. According to the invention, an intelligent irrigation prediction-decision-execution-feedback full-link closed-loop mechanism taking SIREN as a core is realized, and the method has remarkable water-saving and yield-increasing benefits and engineering deployability.

The invention relates to the technical field of remote control, in particular to a steam boiler operation remote dosing control system which comprises a multi-source acquisition module, a state judgment module, a path switching module, a quality verification module and a health evolution module. According to the method, a monitoring system is constructed by fusing multi-dimensional parameters such as flow, pressure and temperature in real time, a single sensor error is eliminated through Kalman filtering, a heat transfer correlation model is established to quantify the water quality and thermal coupling relation, a pipeline blockage critical point is pre-judged based on grey correlation analysis, and non-inductive switching of a dosing path is achieved by adopting a double-electromagnetic-valve redundancy architecture. The stability of medicament conveying is verified by combining the flow offset of a standby path, closed-loop comparison of a concentration amplification value and a target value is synchronously executed to trigger self-calibration to correct the feeding deviation, a water quality adjustment-path switching-precision verification linkage control chain is formed, the abnormal response period is shortened, the scaling rate of a heat transfer surface is reduced, and the stability of the heat efficiency of the boiler is maintained. The equipment maintenance period is prolonged.

The invention discloses a multistage fire-fighting and intelligent heat management combined system and method for an energy storage system, a battery cluster is provided with a single fire extinguishing nozzle, a composite detector monitors the state of the battery cluster in real time, and when any battery cluster meets a spraying condition, the fire extinguishing nozzle is triggered to spray a fire extinguishing material; the internal state of the energy storage cabin is monitored in real time through a composite detector, and when the interior of the energy storage cabin meets the spraying condition, a spraying nozzle is automatically started to continuously spray for preset spraying time; according to the centralized liquid cooling unit, a dual-redundancy compressor is combined with an ethylene glycol aqueous solution circulating system to conduct dynamic flow regulation and control, the opening degree of an electromagnetic valve of the dual-redundancy compressor is dynamically adjusted through a composite detector, and the internal temperature of an energy storage cabin is controlled; dynamically distributing flow according to the energy storage time period by adopting an intelligent temperature control algorithm; after the multi-stage fire-fighting module acts, the centralized liquid cooling unit is started for cooling; when the temperature detected by the composite detector exceeds a high-temperature threshold value, the fan is started for air replacement, and the multi-stage fire-fighting module is triggered to act.

The invention discloses a lithium ion battery immersed liquid cooling regulation and control method and device, terminal equipment and a storage medium, and relates to the field of lithium ion batteries, and the method comprises the steps: obtaining the current temperature data, historical temperature data and cooling liquid fluid parameters of a distributed array in a lithium ion battery, and determining the current temperature field distribution and predicted temperature field distribution; constructing a state space, and inputting the state space into the reference decision model, so that the model outputs corresponding actions according to the current state space by taking the minimum temperature difference of the battery module and the minimum cooling energy consumption as awards; according to the corresponding action, the micro electromagnetic valve and the cooling liquid pump are subjected to benchmark regulation and control; acquiring temperature data after reference regulation and control, and determining temperature deviation in combination with a preset temperature requirement; and regulating and controlling according to the temperature deviation. By implementing the method and the device, the stability of global temperature control is improved, so that the problem of temperature interference on other areas due to cooling liquid flow coupling caused by directly adjusting the opening degree of the valve according to local temperature difference in the prior art is solved.

An airflow controller (100) in a pneumatic vacuum elevator is disclosed. The airflow controller includes a bottom portion (102) and an upper portion (110). The bottom portion is adapted as a hollow stepped cylindrical structure (104) and includes a plurality of plates (108) disposed on a bottom surface of the hollow stepped cylindrical structure. The upper portion includes a cylindrical protrusion (112) configured substantially at a centre portion of the top portion with a projection on an outer face of the cylindrical protrusion, a metal plate (114) incorporated by the upper portion, and a disc (116) including a hollow circular structure (118) with an upper face (116a) and a bottom face (116b) and includes a plurality of extensions (120) positioned on the upper face at predetermined positions and a solenoid valve (122) accommodated by the hollow circular structure (118) and configured to open based on a timer.

The invention discloses a multi-input model compensation plant protection robot pesticide application control system and control method, and belongs to the technical field of agricultural plant protection. The system comprises an upper computer input system, a lower computer controller and a pesticide application system; the upper computer input system is based on an image processing unit of an AI edge computing platform, performs target identification by using a deep learning model, and extracts key information of target crops or weeds in real time; the lower computer controller receives target information transmitted by the upper computer, adopts a dynamic front adjustment strategy of a spray boom virtual line, and dynamically controls an execution element according to the real-time traveling speed of a vehicle, sensor data of a pesticide application system and key information of target crops or weeds, so that accurate target pesticide spraying is realized; the pesticide applying system comprises a pesticide box, a plunger pump, a flow sensor, a pressure sensor, a switch valve, an electric ball valve, an overflow valve, a PWM proportional electromagnetic valve and a nozzle array. The pesticide applying precision is improved, the pesticide using amount is reduced, and the sustainability of agricultural production is improved.

The invention provides an intelligent gas supply system of SF6 gas insulation equipment and an intelligent gas supply control method. The system comprises SF6 gas source equipment, the SF6 gas insulation equipment, a gas pressure sensor, a gas temperature sensor and a gas supply control module, the air supply control module comprises a control unit and an electromagnetic valve; the gas inlet end of the electromagnetic valve is connected with the gas outlet end of the SF6 gas source equipment through a pipeline, and the gas outlet end of the electromagnetic valve is connected with the gas inlet end of the SF6 gas insulation equipment through a pipeline; the control module is used for receiving a gas pressure value collected by the gas pressure sensor and a gas temperature value collected by the gas temperature sensor; dynamically calculating a gas pressure dynamic threshold value for judging SF6 gas leakage; the gas pressure value measured in real time is compared with the current corresponding gas pressure dynamic threshold value, and if the gas pressure value measured in real time is smaller than or equal to the current corresponding gas pressure dynamic threshold value, the electromagnetic valve is controlled to be opened, so that the SF6 gas source equipment supplements gas to the SF6 gas insulation equipment.

The invention provides a thermal behavior experiment system and method under a narrow rectangular channel reflooding cooling condition. The system comprises a heating water storage tank, a nitrogen tank, a steam tank, a shield pump, a preheating section, a first direct-current power supply, a second direct-current power supply, a narrow rectangular channel test section, a steam-water separator, a surge tank, a flow control valve, a silencer and an electromagnetic valve. The experimental working medium is deionized water, and re-submerging cooling experiments under different system pressures, working medium supercooling degrees, heating wall surface heat flux densities, working medium submerging speeds, heating wall surface initial temperatures and channel interior initial liquid levels can be carried out on an experimental section of a narrow rectangular channel structure. The device is suitable for narrow rectangular channel structures with different sizes, and can be used for carrying out re-submerging experiments on experiment sections with single-plate double-channel, double-plate three-channel and more channels. The system pressure and the inlet flow in the submerging process can be kept stable, and it can be ensured that the supercooling degree of a working medium, the heating wall surface temperature and the initial liquid level are controllable.

The invention relates to the technical field of sewage control, in particular to a control method and system of sewage treatment equipment and a medium. The method comprises the following steps: arranging a buffer cavity made of a flexible material at the water inlet end of sewage treatment equipment; the volume of the buffer cavity is adjusted in real time according to the original water inlet flow, and a flexible buffer cavity volume dynamic adjustment strategy is obtained; if the flexible buffer volume dynamic adjustment strategy executes the volume adjustment of the buffer cavity, evaluating the water outlet stability degree of the buffer cavity to obtain buffer effect evaluation data; a miniature electromagnetic valve is used for controlling the inlet opening degree of a reactor unit in the sewage treatment equipment, and the water inlet flow of the reactor unit is controlled to be balanced; and adjusting the porosity of the reactor unit partition plate to realize dynamic control and adjustment of sludge sedimentation. By dynamically adjusting the volume of the buffer cavity, water inlet flow fluctuation is effectively buffered, fine control over sludge sedimentation is achieved, and the impact resistance and operation stability of sewage treatment equipment are remarkably improved.

The invention discloses a pressure regulating solenoid valve, which relates to the technical field of solenoid valves, and comprises a valve body, the top of the valve body is provided with a valve seat, the valve seat is internally provided with a cavity, and through the arrangement of a first pressurizing hole, a second pressurizing hole, a flow dividing hole, a first flow dividing pipeline, a second flow dividing pipeline, a first pressurizing cavity and a second pressurizing cavity, the pressure regulating solenoid valve is formed. During use, when unstable high water pressure flows into the valve body, the high water pressure pushes the inner barrel upwards, then the inner barrel moves upwards to drive the flow dividing holes to move upwards, the flow dividing holes are driven to be sequentially in butt joint with the first pressurizing hole and the second pressurizing hole respectively, and then water is divided into the first flow dividing pipeline and the second flow dividing pipeline; then water flows into the first pressurizing cavity or the second pressurizing cavity, then water pressure is dispersed, then the water flowing into the first pressurizing cavity or the second pressurizing cavity downwards compresses the first spring to cause deformation shortening, and meanwhile, a stretched second spring is matched, so that when the water pressure upwards jacks the sleeve and the inner cylinder, buffering protection on the sleeve and the inner cylinder is enhanced.

The invention discloses a shale oil exploitation method based on cooperation of multistage pulse gas fracturing and nano-catalysis, and belongs to the technical field of oilfield development, and the shale oil exploitation method comprises the following steps: S1, determining an optimal drilling position of a target shale layer, and carrying out drilling operation; s2, 0.1-10 Hz adjustable pulse pressure waves are formed through control of a high-frequency electromagnetic valve, a fracturing medium mixed with the functionalized nanoparticles is injected into the stratum through a fracturing pump, the pulse frequency of the high-frequency electromagnetic valve is adjusted, staged pulse fracturing operation is conducted, and a fracture network is formed; s3, after fracturing of each stage is completed, mixed fluid of a propping agent and fracturing fluid is injected into stratum fractures; and S4, after fracturing operation is completed, a microwave field is applied to the stratum, and the stratum temperature is kept within a set range. According to the method, the gas fracturing medium and the functionalized nanoparticles are mixed and then fractured, so that the influence on the environment is remarkably reduced, and the recovery ratio of shale oil is greatly increased under the combined action of multi-stage pulse fracturing, the composite proppant and the microwave field.

The invention relates to a base, a shock absorber assembly, a suspension system and a vehicle. The base is used for being matched with a piston and comprises a piston connector and a first communicating pipeline. The piston interface includes a first inlet and outlet and a second inlet and outlet. The first inlet and outlet is used for communicating with the first cavity of the piston. The two ends of the first communicating pipeline are connected with the first in-out opening and the second in-out opening correspondingly. The first communicating pipeline is provided with a first control connector and a damping connector. And the first control interface is used for being connected with a first electromagnetic valve for controlling on-off of the first communicating pipeline. The damping interface is used for being connected with a damping valve for controlling fluid flow damping of the first communicating pipeline. The piston connector and the first control connector are located on different surfaces. The piston interface and the damping interface are located on different surfaces. The base is integrated with the piston connector, the first control connector and the damping connector, so that the shock absorber assembly can be connected with the first electromagnetic valve and the damping valve, and the function integration level of the shock absorber assembly can be improved.

A solenoid includes a first fixed iron core and a second fixed iron core located on a first end side and a second end side of an axial direction of a coil, a first movable iron core and a second movable iron core located therebetween and attracted by the first fixed iron core and the second fixed iron core by passage of current through the coil, respectively, a spring housed in a spring chamber formed on the first fixed iron core side of the first movable iron core and biasing the first movable iron core to the second fixed iron core side, a leaf spring that regulates movement of the first movable iron core to the second fixed iron core side with respect to the second movable iron core, and a throttle passage that causes the spring chamber to communicate with outside.

The invention discloses a traceable cavity ring-down spectrometer system with a self-calibration function, and is applied to the technical field of gas concentration detection. The device comprises an optical cavity ring-down main body, a dynamic generation module and a reference analysis module which are connected in sequence, wherein the optical cavity ring-down main body comprises a laser light source, a beam splitter, an optical fiber isolator, a lens, a first reflecting lens, a first aluminum ring, a sample cell, a second aluminum ring, a cross shaft type universal coupling control device and a second reflecting lens which are arranged along a laser light path; the dynamic generation module comprises a high-purity gas inlet, a gas purifier, a dynamic generation device, a standard gas outlet and a three-way electromagnetic valve which are arranged along a gas path; the reference analysis module comprises an instrument standard gas inlet, a reference analyzer and a standard gas storage box which are arranged along the gas path. According to the method, the influence of instrument drift on analysis data caused by the use environment and instrument part loss of the online instrument is avoided, and the accuracy and the quantity value traceability of the instrument analysis data are guaranteed.

The invention relates to the technical field of data analysis, in particular to a comprehensive management system and management method for steam condensate drainage data of a vulcanizing machine. According to the comprehensive management system and method, a generative adversarial network is adopted to calculate the steam flowing node correlation degree, analyze the condensate drainage valve opening and closing influence, construct a steam hydrophobic topology network and establish a flow distribution model, and temperature gradient changes are combined; the method comprises the following steps: acquiring a steam condensate drainage state mapping structure, enhancing the global analysis capability of a condensate drainage system, analyzing steam load balance by adopting a long-short-term memory network, predicting steam supply demands, forming a steam condensate drainage intelligent regulation and control strategy, calculating pressure abnormal deviation, analyzing a steam leakage rate, predicting a steam loss trend, and detecting an abnormal switch state of an electromagnetic valve. The system stability is improved, and the energy loss is reduced by extracting the blockage characteristics of the condensate drain valve, evaluating the pressure loss of the system, improving the fault prediction capability, adjusting the opening and closing states of the electromagnetic valve and correcting the control instruction of the condensate drain valve according to the steam condensate drain intelligent regulation and control strategy and the condensate drain abnormal characteristic analysis result.

The invention provides a constant-heating defrosting system of a heat recovery air conditioner and a defrosting control method and device. According to the system, a compressor, a first electromagnetic valve, a water tank, a first expansion valve, a first one-way valve, a second electromagnetic valve, an outdoor heat exchanger and a four-way valve are connected to form a first heating loop; a compressor, a first electromagnetic valve, a water tank, a first expansion valve, a first one-way valve, a third electromagnetic valve, an energy storage water tank, a fourth electromagnetic valve and a four-way valve are connected to form a first defrosting loop. A compressor, a fifth electromagnetic valve, a second one-way valve, an outdoor heat exchanger and a four-way valve are connected to form a second defrosting loop; and the first heating loop, the first defrosting loop and the second defrosting loop form a single heating water defrosting loop. The problem that in the prior art, in the defrosting process, the comfort experience of a user is affected due to the fact that an air conditioner does not conduct heating is solved.

The invention provides a fuel injector solenoid valve reliability prediction method based on multi-physics field coupling, and relates to the technical field of solenoid valve reliability prediction, and the method comprises the steps: collecting real-time operation data and historical operation data, constructing a multi-physics field coupling model of a solenoid valve, sequentially inputting the historical operation data into the model, and carrying out the prediction of the reliability of the solenoid valve. A finite element analysis method is used for solving the model, multi-physical field distribution characteristics of the electromagnetic valve are obtained, historical reliability parameters are extracted from the multi-physical field distribution characteristics, category labels are added to the historical reliability parameters, real-time operation data are input into the multi-physical field coupling model, and real-time reliability parameters are obtained; and inputting the real-time reliability parameter into the BI-LSTM model, and outputting a prediction result. According to the method, the multi-physical field model and the machine learning model are combined, and the mechanism advantages of the physical model and the data driving advantages of the machine learning model can be comprehensively utilized, so that the reliability of the electromagnetic valve is predicted more accurately.

The present invention discloses a multi-cabin multiplexed animal respiration thermometry metabolic analysis system and a detection method in the field of metabolic cabin technology, comprising a metabolic cabin control group and multiple metabolic living cabins. An equipment cabinet is arranged inside the metabolic cabin control group, and detection pipelines for collecting gas and gas transmission pipelines for conveying gas are respectively arranged between the equipment cabinet and the multiple metabolic living cabins. A buffer empty cabin for conveying gas buffer is arranged on the inner rear side of each metabolic living cabin, and the buffer empty cabin is connected to the gas transmission end of the gas transmission pipeline, an exhaust solenoid valve is installed between two adjacent detection pipelines, and an intake solenoid valve is installed between two adjacent gas transmission pipelines. The present invention utilizes the buffer empty cabin to ensure the stability of the gas entering the metabolic living cabin, and flushes and corrects the sensor inside the concentration analyzer with standard gas, thereby reducing the accuracy of the detection data affected by the internal drift of the sensor inside the concentration analyzer.

Disclosed are a maize on-demand fertilization control system and a soil nitrogen soft measurement method. Sensors transmit real-time data to a control unit, which calculates soil nitrogen content using an optimized BP neural network model. Based on maize's nitrogen demand, the system adjusts fertilization amounts using solenoid valves, achieving precise, cost-effective fertilization.

The invention discloses a system and a method for analyzing the running state of an electromagnetic valve, and relates to the technical field of electromagnetic valve control, the method comprises the following steps: carrying out joint modeling by using a semi-closed feature set Fhc to obtain an incomplete closing probability Puh, generating a dynamic threshold Thp through a self-adaptive threshold, and setting an event level judgment tag Jeh when the incomplete closing probability Puh exceeds the dynamic threshold Thp, so as to obtain the running state of the electromagnetic valve. Compared with an existing scheme that binary judgment is carried out only according to whether the action is completed or not, early and stable recognition is achieved for high-frequency and hidden abnormities such as semi-closed abnormities under common working conditions, and then energy consumption rising and safety risks caused by leakage are blocked in advance; meanwhile, the self-adaptive correction of the dynamic threshold Thp to the environment temperature Tmp and the power supply stability Vst effectively reduces false alarm and missing alarm, so that the judgment is kept consistent under multiple working conditions; the chain type output can directly support operation and maintenance evidence obtaining and trend evaluation, the predictive maintenance efficiency is improved, and unplanned shutdown is reduced.

The invention belongs to the field of stainless steel. Specifically, the invention relates to soft magnetic stainless steel containing Cr, Cu, Mo, Nb and rare earth elements, and a soft magnetic stainless steel profile and a product prepared from the soft magnetic stainless steel. The Cu element contained in the soft magnetic stainless steel can be separated out to form nano Cu when the soft magnetic stainless steel is subjected to aging treatment, so that the mechanical property of the obtained soft magnetic stainless steel profile can be effectively improved, and the soft magnetic stainless steel profile has excellent low-temperature toughness and soft magnetic property; in addition, microalloy precipitation is optimized through Nb and rare earth element compounding, so that the proper fine grain size is obtained, and the soft magnetic stainless steel profile has excellent low-temperature toughness; and meanwhile, the tensile strength of the soft magnetic stainless steel profile is improved through the solution strengthening effect of Mo, and the corrosion resistance of the soft magnetic stainless steel profile is improved. The soft magnetic stainless steel profile can be effectively applied to electromagnetic valves and related products which serve in low-temperature media and require certain strength, and has good popularization prospects and application value.

The invention provides a blood pressure measurement system and method based on multi-airbag cooperative control and oscillatory wave analysis, and relates to the technical field of medical instruments. Comprising an integrated cuff cover body, an inflator pump, an electromagnetic valve, a pressure balancing device and a microprocessor, a first air bag, a second air bag and a third air bag are arranged in the integrated cuff cover body, firstly, an inflation pump is started, the multiple air bags are synchronously inflated to preset initial pressure, then a first air bag electromagnetic valve and a third air bag electromagnetic valve are closed, a pressure balance device dynamically adjusts a miniature deflation valve, and the pressure in the first air bag and the pressure in the third air bag are kept constant; the inflator pump continues to inflate until the pressure in the second airbag is higher than the systolic pressure level; the measuring method specifically comprises a multi-air-bag pressure measuring mode and a double-air-bag pressure measuring mode. The multi-air-bag pressure measuring mode is that three air bags are used for measuring pressure at the same time, and the double-air-bag pressure measuring mode is that only the second air bag and the third air bag are pressurized, so that blood pressure measurement is achieved.

The invention provides a multi-stack series controllable fuel cell system, a stack closing control method and a vehicle, the system comprises a stack module, a high-voltage power module, a double-switch module, an air supply module, a hydrogen supply module and a thermal management module, the stack module comprises a plurality of stacks which are electrically connected in series, a series circuit between the negative electrode end of each electric pile and the positive electrode end of the next electric pile is marked as an electrical circuit, and the positive electrode end of the first electric pile is connected with the positive electrode end of the high-voltage power module to form the electrical circuit; the double-switch module comprises a first relay switch and a second relay switch; the first relay switch is configured for each galvanic pile and is arranged on an electrical circuit related to the positive end of the galvanic pile; the second relay switch is connected in parallel with the galvanic pile; the system further comprises a first electromagnetic valve module arranged between the air supply module and the electric pile module, a second electromagnetic valve module arranged between the hydrogen supply module and the electric pile module, and a third electromagnetic valve module arranged between the heat management module and the electric pile module. The service life of the system can be prolonged.

The invention discloses a methanol direct injection injector, comprising: an injector body and a solenoid valve component, an orifice plate, a control valve seat and a needle valve component which are installed below the injector body through a tight cap of the injector body; wherein the solenoid valve component is located above the orifice plate, the orifice plate is located above the control valve seat, and the control valve seat is located above the needle valve component; a first and a second straight hole are arranged on the orifice plate, an inclined hole, a third straight hole and two small holes are arranged on the control valve seat, a needle valve component control chamber is arranged on the upper part of the needle valve component, the lower end of the first straight hole is communicated with the lower end of the second straight hole on the orifice plate and the upper ends of the inclined hole, the third straight hole and the two small holes on the control valve seat, and the lower ends of the inclined hole, the third straight hole and the two small holes on the control valve seat are communicated with the needle valve component control chamber; the opening and closing of the second straight hole on the orifice plate is controlled by turning on and off the power of the solenoid valve component, and then the methanol liquid pressure in the control chamber of the needle valve component is controlled to realize the start of the needle valve component injection.

The invention discloses a load simulation loading system based on an engineering mechanical power system and a control method thereof, and relates to the technical field of mechanical power system simulation. The load simulation loading system comprises an engineering machinery power system, a load loading system, a whole vehicle control unit and an upper computer platform. The engineering machinery power system comprises a first oil tank, a main pump, a pilot pump, a pilot control handle, a signal control valve and a multi-way valve. The load loading system comprises a three-position four-way reversing valve, a proportional overflow valve, a first proportional throttle valve, a second proportional throttle valve, an electromagnetic valve, a third proportional throttle valve and a variable pump, wherein the three-position four-way reversing valve, the proportional overflow valve and the first proportional throttle valve are connected to the multi-way valve, the second proportional throttle valve and the electromagnetic valve are connected to an outlet of the proportional overflow valve, and the third proportional throttle valve is connected between the second proportional throttle valve and the second oil tank. And the three-position four-way reversing valve is constructed to enable an inlet of the proportional overflow valve to be communicated with one of the oil port A and the oil port B of the multi-way valve in a switching manner, and an outlet of the proportional overflow valve to be communicated with the other one of the oil port A and the oil port B in a switching manner.

The invention relates to the field of valve element machining, and discloses automobile electromagnetic valve element inner hole machining equipment which comprises a shell, a partition plate is fixedly connected to the middle of the inner side of the shell, and a machining mechanism is arranged on the right side of the interior of the partition plate and used for facilitating the device to machine a valve element. A fixing mechanism is arranged on the right side of the partition plate and used for conveniently fixing the valve element, and a filtering mechanism is arranged on the lower middle portion of the inner side of the shell and used for conveniently recycling cooling liquid. The machining mechanism comprises a sliding rail, and the sliding rail is fixedly connected to the middle of the right end of the inner side of the shell. The mounting seat is fixed through the inserting rod, the first motor drives the first gear to rotate, and the rack drives the carrying table to move, so that a workpiece is sequentially milled, drilled, turned and ground on the same equipment, and the precision of a valve element can be improved while the machining efficiency is improved.

The invention discloses an electromagnetic valve fault diagnosis method and system, a storage medium and a program product, and relates to the field of magnetic variable measurement, in the method, an alternating current signal of a first preset frequency is applied to an electromagnetic valve coil, an inherent working current signal is collected, and a mixed current signal is generated; separating the mixed current signal to obtain a harmonic component; determining a target frequency based on the harmonic component; generating an excitation current signal of a second preset frequency according to the target frequency; applying an excitation current signal to a solenoid valve coil, and collecting a resonance current signal generated by the solenoid valve under the excitation current signal; determining the resonance characteristic of the internal mechanical structure of the electromagnetic valve according to the amplitude and the phase characteristic of the resonance current signal; and identifying the fault type of the electromagnetic valve based on the change trend of the resonance characteristic along with time. The method is used for improving the accuracy of identifying the evolution trend of the fault features, further preventing possible faults of the electromagnetic valve in advance, and improving the safety of the electromagnetic valve in the using process.

The utility model provides a fuel gas pressure reducing valve with a pilot-operated type fuel gas cut-off valve, which comprises a valve seat, a valve cover and a piston assembly, a gas inlet and a gas outlet are arranged on the valve seat, and the cut-off valve assembly is arranged on a gas inlet channel communicated between the gas inlet and the piston assembly and used for controlling on-off of gas flow in the pressure reducing valve. A three-way electromagnetic valve assembly is arranged in the valve seat on one side of the stop valve assembly, the three-way electromagnetic valve assembly is provided with an air inlet hole, a second air outlet hole and a third air outlet hole, and high-pressure air entering from the air inlet connector is communicated to the air inlet hole of the three-way electromagnetic valve assembly through a first process hole formed in the valve seat; the third air outlet hole is communicated with the back face of the stop valve assembly through a second process hole formed in the valve seat, and the second air outlet hole is communicated with the air outlet through a third process hole formed in the valve seat. Through the design of the independent three-way electromagnetic valve, a valve element switch is controlled by adopting very small electromagnetic force, so that the airflow direction is controlled, and switch control over the high-pressure main loop stop valve assembly is achieved.

The invention relates to an NO delivery apparatus (1) for supplying an NO-containing gas, comprising an NO injection line (111) with a normally closed valve device (113), and a flow rate measurement device (112); an emergency circuit (200) comprising an emergency line (201) connected to the injection line (111), with a normally open emergency solenoid valve (202); and operating means (130). In the event of malfunction of the operating means (130), the flow rate control device (210) supplies the gas at a pre-fixed emergency flow rate of gas that has been determined prior to said malfunction. A multi-way solenoid valve (205) is arranged downstream of the flow rate control device (210) and supplies dosing lines (206, 207) having a calibrated orifice device (208, 209). Installation (1, 2) for supplying gas to a patient and comprising such an apparatus (1).