1098 results about "Pneumatic valve" patented technology

The invention provides a fluid pipe network intelligent management and control system and method based on multi-order spatial-temporal feature fusion, and the system comprises an embedded Internet of Things sensing layer which comprises an electric valve control mainboard and / or a pneumatic valve control mainboard embedded with a remote information transmission module, the flow sensor, the heat sensor and the water invasion sensor are connected with the control mainboard; the multi-order spatio-temporal feature processing layer comprises a spatio-temporal feature extraction module configured to perform sliding window slicing processing on time sequence data of pressure, flow velocity and temperature parameters; and the feature fusion module is configured to perform feature alignment on the vibration atlas, the voiceprint signals and the infrared thermal imaging data through a multi-head attention mechanism. According to the fluid pipe network intelligent management and control system and method based on multi-order spatio-temporal feature fusion, the management and control efficiency and safety of the fluid pipe network are remarkably improved through embedded multi-source sensing, multi-order spatio-temporal feature fusion and an intelligent decision framework.

The invention discloses a pneumatic valve intelligent control method based on deep reinforcement learning, and relates to the technical field of automatic control. The method comprises the following steps: step 1, establishing a dynamic model of the pneumatic valve according to real-time operation parameters in a multi-physical coupling behavior of the pneumatic valve; 2, defining a state space of the pneumatic valve control system according to the kinetic model; 3, inputting the state space into a pre-established deep reinforcement learning model, and outputting a real-time electromagnetic control current for the pneumatic valve; the deep reinforcement learning model is a double-deep Q network and comprises two same deep Q networks so as to relieve an over-estimation problem; each deep Q network is provided with a single hidden layer, and the weight and the bias of the hidden layer are correspondingly equal to the weight and the bias of the output layer respectively. According to the method, the problems of response lag, difficulty in parameter self-adaption and high energy consumption of a traditional control strategy under a complex working condition are solved, and the intelligent level of a control system is remarkably improved.

The invention provides an organic waste gas treatment device based on zeolite molecular sieve adsorption and desorption treatment. The organic waste gas treatment device comprises an efficient pretreatment unit, a composite zeolite molecular sieve adsorption tower group, a plasma-assisted microwave-hot air regeneration unit, a multi-mode tail gas treatment unit, a digital twin intelligent regulation and control system and a modular expansion interface. By integrating the high-precision VOCs analyzer, the self-adaptive airflow controller, the infrared spectrometer, the multi-channel heat recoverer, the high-performance edge computing server and the intelligent pneumatic valve system, the optimized processing method realizes accurate execution of a formula, the VOCs removal rate is remarkably increased, and carbon loss and energy consumption are reduced. The method has the remarkable advantages in the aspects of VOCs removal rate, zeolite regeneration efficiency, energy consumption control and operation cost, meanwhile, through deep intelligent regulation and multi-mode treatment, the efficient, stable and low-cost VOCs treatment requirements under complex working conditions are met, and an innovative solution is provided for industrial waste gas treatment.

The utility model discloses a polyester reverse esterification kettle on-line adding device which comprises a first esterification kettle and a second esterification kettle, a batching pipeline is arranged between the first esterification kettle and the second esterification kettle, and a three-monomer on-line injection system is arranged on one side of the batching pipeline. A second static mixer, a dynamic mixer and a pneumatic valve are sequentially arranged on the batching pipeline between the three-monomer on-line injection system and the second esterification kettle, and materials prepared by the three-monomer preparation system are injected into a connecting pipeline through the three-monomer on-line injection system; and then the mixture enters the second static mixer and the dynamic mixer to be mixed and then is injected into the second esterification kettle through the pneumatic valve. The transformation from production of extinction products to production of cationic products can be quickly realized in the five-kettle process, so that the productivity and the quality of the products are ensured, and benefits are created for enterprises to be maximized.

The invention relates to the technical field of pressure valves, and provides a high-back-pressure pneumatic valve for a semiconductor chemical system and an assembling method of the high-back-pressure pneumatic valve. The high-back-pressure pneumatic valve comprises an air cylinder assembly, a diaphragm and a valve seat. The cylinder assembly is provided with a cylinder upper cover and a cylinder body which are connected through a rotary lock catch structure, and the piston is assembled on the cylinder body. The diaphragm is provided with a sealing diaphragm part and a valve element integrally arranged in the center, the sealing diaphragm part is provided with a pressure-bearing protrusion and a sealing hook, and the pressure-bearing protrusion provides a back pressure counteracting area accounting for 25%-50% of the flexible area of the diaphragm. A valve port and a flow channel are formed in the valve seat, a mounting hole aligned with the valve port is formed in the valve seat, a sealing clamping groove is formed in the mounting hole, and the sealing clamping groove and the sealing hook are matched to form a sealing interface. The valve element table body is arranged at the valve port and driven by the air cylinder assembly to seal or break away from the valve port. According to the invention, high-back-pressure fluid impact can be effectively balanced, and the assembly efficiency and the maintenance convenience are greatly improved.

The invention discloses a fault monitoring sealing ball valve, belongs to the technical field of ball valves, and solves the problems that a self-adaptive compensation mechanism of an intelligent valve positioner can cover the degradation process of mechanical wear of a pneumatic sealing ball valve quietly during long-term operation, and finally sudden control instability is caused due to the fact that nonlinear wear exceeds a compensation limit. Comprising a valve body, a pneumatic actuator arranged on the valve body, a valve rod which is in transmission connection with an output shaft of the pneumatic actuator and located in the valve body, a valve ball fixedly connected with the valve rod and a fault prediction circuit. The fault prediction circuit comprises a multi-dimensional physical sensing array module, a high-speed synchronous acquisition and preprocessing module, a core signal processing and fusion analysis module, an artificial intelligence coprocessor module and a predictive maintenance decision and life cycle management module. Multi-dimensional signals are collected in real time, valve health is evaluated after fusion analysis, and early warning and maintenance decisions are output.

The invention relates to the technical field of chemical engineering, and particularly discloses a palladium-carbon catalytic hydrogenation reaction material treatment system, which comprises a three-dimensional workshop structure, an air-operated hoist, an air supply system, an air supply system and an air supply system, wherein the top of the three-dimensional workshop structure is provided with an elevator and a hoisting ton bag; the palladium-carbon circulating unit comprises a palladium-carbon preparation kettle, a hydrogenation reaction kettle, a decarbonization filter, a filter pressing cylinder, a sample splitter and a glove box which are connected in sequence, and the sample splitter is connected back to the palladium-carbon preparation kettle through a closed pipeline; the solid feeding unit comprises a ton bag feeder, a pneumatic valve and a spiral conveying pipe, and the tail end of the solid feeding unit is connected with a top feeding hole of the hydrogenation reaction kettle; the gas supply system comprises a hydrogen cylinder group and is connected to a gas distributor at the bottom of the hydrogenation reaction kettle through a pressure reducing valve and a flow regulating valve; through the multi-stage separation design and the safety interlocking mechanism of the palladium-carbon circulating unit, the recovery rate of the catalyst is increased, meanwhile, the pressure, temperature and stirring state are monitored in real time to trigger nitrogen purging or pressure relief, and the risks of hydrogen leakage and reaction out-of-control are reduced in combination with inert gas protection of the glove box.

The invention relates to the technical field of mine water concentration treatment, and provides a reverse osmosis treatment system and a method thereof.The reverse osmosis treatment system comprises a control system, a raw water booster pump, a precision filter, a plunger pump, a circulating pump, a plurality of STRO membrane sets arranged in parallel, an internal circulation pressure reducing valve, an energy recovery device and a concentrated liquor outward-discharging pneumatic valve; the raw water booster pump, the precision filter, the plunger pump, the circulating pump and the STRO membrane group are connected in sequence; effluent of each STRO membrane group is divided into a concentrated solution and a permeate, the permeate is discharged through a water production pneumatic valve, one part of the concentrated solution returns to an inlet of the circulating pump, and the other part of the concentrated solution is discharged after passing through the energy recovery device. The yield of the concentrated liquor is reduced by half compared with that of secondary concentrated liquor, a large number of available water resources are saved, meanwhile, the treatment scale of rear-end evaporation crystallization equipment is reduced, the tolerance of a film element is protected, the service life of the film element is prolonged, and energy consumption is greatly reduced.

A pneumatic valve comprises an actuator with a movable closing element being disposed in a housing; the closing element with a tappet penetrating an actuator opening between an air chamber formed in the housing and an actuator chamber, and a plate, with a sealing element, for closing the supply opening, thereon, on that end of said tappet protruding into the air chamber, and an elastic element pressing the plate toward the actuator opening in an activated state; the actuator element configured to move, in a non-energized state, the activating element to press the tappet against a supply opening, and in an energized state to move the activating element so as not to exert force on the tappet so that the plate is pressed in the direction of the actuator opening by the elastic element. A sealing collar disposed about the tappet seals the air chamber from the actuator chamber.

The invention discloses an integrated valve pneumatic actuating mechanism which is used for being installed on a valve body to conduct fault diagnosis on a valve and comprises a gas driving unit, a support unit, a displacement sensor unit, an I / P conversion unit, a control unit, a connecting rod unit and a displacement feedback unit. The invention further discloses a fault diagnosis method based on the integrated valve pneumatic actuator. The valve position control function and the valve fault diagnosis function are integrated, a mounting support needed by an existing split type scheme is omitted, the mounting and debugging process before the pneumatic valve is put into production is greatly simplified, the clamping stagnation fault existing in the valve is detected losslessly and efficiently, the influence of the fault on normal operation of the valve is reduced through control compensation, and the working efficiency of the pneumatic valve is improved. And the material cost, the labor cost and the time cost of installation and debugging are greatly reduced. And a metal pipeline in the integrated valve pneumatic actuating mechanism not only is compact in structure, but also enhances the environmental adaptability and stability of the pneumatic valve.

The invention relates to a workpiece carrier for arrangement in a machine tool. The workpiece carrier includes multiple pneumatic workpiece holders as well as a compressed air reservoir, pneumatic valves, a control unit, and an accumulator as a voltage supply, so that the workpiece carrier can hold a plurality of workpieces and be wirelessly activated by an external robot controller in order to clamp workpieces in the workpiece holders or remove workpieces therefrom.

The utility model belongs to the technical field of on-line analysis of tail gas emission, and particularly relates to a stable-pressure sampling device of an FTA analyzer. Comprising a sampling probe, a high-temperature electric heat tracing integrated pipe cable, a stop valve, a bypass filter, a sample injection pressure reducing valve, a sample injection needle valve, a sample injection pneumatic valve, a sample injection pressure transmitter, a bypass flowmeter, an instrument air pressure reducing valve, an I / P controller, a PID control unit, an FTA analyzer, a box body heater, a pretreatment heat preservation box and the like. According to the pretreatment pressure stabilizing system disclosed by the utility model, through the design of the connection relation among the structures of the pretreatment pressure stabilizing system, pressure stabilizing sampling can be realized under the condition of pipeline pressure fluctuation, and the measurement accuracy of real-time monitoring of chemical tail gas is improved.

The utility model relates to the technical field of pneumatic valves, in particular to a pneumatic valve with a tungsten carbide coating, which comprises a pneumatic valve main body, a valve body is arranged on the pneumatic valve main body, a valve seat positioning seat with an integral structure is arranged in the valve body, and the upper end and the lower end of the valve body are respectively provided with an opening structure with a flange plate. The upper end and the lower end of the valve body are connected with a pneumatic diaphragm actuator support and a fastening seat respectively, a valve seat is clamped and fastened to the upper end of the fastening seat, a valve seat coating is sprayed to the outside of the valve seat, material channels are formed in the side face of the valve seat at intervals, a valve element matched with the valve seat is arranged above a valve seat positioning seat, and a valve element coating is sprayed to the outside of the valve element. According to the pneumatic valve with the tungsten carbide coatings, the tungsten carbide coatings are arranged on the matched portions of the valve element and the valve seat, the abrasion resistance of the sealing face can be effectively improved, the service life of the valve is prolonged, meanwhile, the valve element and the valve seat are detachable, and maintenance of the valve is easy.

The utility model discloses a salt lake lithium extraction adsorbent scrubbing system which comprises a scrubbing tower and an adsorption tower, and a sunken water distributor is arranged at the bottom end in the scrubbing tower; the middle position of the bottom of the concave water distributor penetrates through the bottom of the scrubbing tower and is connected with a runner opening; a water replenishing opening is formed in the middle of the bottom of the scrubbing tower; two feed ports are formed in the positions, close to the water inlet, of one side of the scrubbing tower, and a water outlet is formed in the position, close to the top, of one side of the scrubbing tower; the flow channel port is sequentially connected with a pneumatic valve j, a diaphragm pump B and an adsorption column through a pipeline; according to the system, crushed resin particles and impurities are effectively removed by cleaning an adsorbent, so that the adsorption performance and the flowability of a resin bed layer are recovered, and it is ensured that the resin bed layer is always in the optimal working state. In the process of scrubbing the adsorbent, the adsorbent does not need to be manually carried except for necessary adsorption tower pipeline connection operation, so that the scrubbing efficiency is remarkably improved.

The utility model discloses a filling pipeline pressure releasing and maintaining stable conveying device which comprises a pressure maintaining device, a pressure releasing device and a pneumatic valve, and particularly comprises a high-pressure plunger pump, the pneumatic valve, a pressure releasing valve and a one-way valve device. Wherein a high-pressure plunger pump is adopted in the pressure maintaining device, pressure oil serves as a pressure source, an air pressure type pressure relief device is adopted in the pressure relief device, according to the air expansion principle, when the pressure exceeds a preset value, air expands to push the device to be started, a one-way valve is arranged in the pressure relief device, and a pneumatic valve is additionally arranged; the method is used for controlling stable conveying of gas in the filling pipeline. According to the structure, through function linkage of the pressure relief device and the pressure maintaining device, stability of slurry conveying is guaranteed, the serious problems of pipeline abrasion, pipe blockage and pipe explosion in the conveying process are avoided, the phenomenon of uneven filling slurry and the safety accident problem are avoided, and the mine production efficiency and safety are improved.

The invention discloses an atomic layer deposition gas supply system for a low saturated vapor pressure precursor source, and belongs to the technical field of atomic layer deposition reaction equipment. According to the system, a mass flow controller is combined with an original gas inlet pneumatic valve, so that the gas quantity in a precursor source bottle in the deposition process is accurately controlled; the pressure in the precursor source bottle is monitored in real time through a pressure meter, so that the temperature in the deposition process is accurately controlled; in addition, specific contents of precursor source gas and auxiliary gas in source gas are monitored in real time through a gas analyzer at a source outlet, so that a system is assisted to judge whether reaction gas needs to be supplemented or not; the mass flow controller, the pressure meter and the gas analyzer are all connected with the PLC, and control of all the parts is achieved through the PLC; and gas control, pressure monitoring and component monitoring of the low saturated vapor pressure precursor source in the experiment process are realized.

The utility model discloses a low-temperature rectification process system for preparing ultralow-concentration deuterium-depleted water, and relates to the technical field of preparation of deuterium-depleted water. The system comprises a low-temperature rectification system, wherein the low-temperature rectification system is provided with a feeding pipeline, a low-deuterium-hydrogen isotope gas pipeline and a high-deuterium-hydrogen isotope gas pipeline; the feeding pipeline is provided with a feeding mass flow controller; the low-deuterium hydrogen isotope gas pipeline is provided with a first discharge mass flow controller and is connected with a gas conversion system; the deuterium-rich hydrogen isotope gas pipeline is provided with a second discharge mass flow controller and is connected with an exhaust pipeline through a flame arrester; the inlet side of the flame arrester is further connected with a vacuum pump, the inlet side of the vacuum pump is connected with a third pneumatic valve, and the third pneumatic valve is connected with a low-deuterium-hydrogen isotope gas pipeline and connected with the inlet side of the flame arrester through a safety protection discharging system. According to the utility model, the separation efficiency of hydrogen isotopes is improved, so that ultralow-concentration deuterium-depleted water is produced more effectively, and compared with the prior art, the preparation process is simplified conveniently.

A method is for operating a compressed air system in a vehicle. The compressed air system has pneumatically operated actuators, switchable pneumatic valves and devices for supplying and preparing compressed air, which are connected to one another via a pneumatic line system. The devices for supplying compressed air include a compressed air source and a compressed air store, and in the line system a pressure sensor is provided for measuring the pressure. An algorithm is programmed such that depending on the difference between the pressure in the compressed air store and the pressure in the line system, pneumatic valves are actuated to connect the compressed air store to the line system only after pressure equalization between the pressure in the compressed air store and the pressure in the line system. During pressure equalization, compressed air from the source and / or the actuators or devices is introduced into the line system.

The invention provides a pneumatic driving part and a pneumatic valve, and relates to the technical field of valve control. The pneumatic driving piece comprises a front cover, a rear cover, a cavity and a piston piece; the first end of the cavity is connected with the front cover, the second end of the cavity is connected with the rear cover, the piston piece is arranged in the cavity, and the cavity is divided into a first inner cavity corresponding to the front cover and a second inner cavity corresponding to the rear cover based on a piston head of the piston piece; the piston piece is used for moving based on the pressure difference between the first inner cavity and the second inner cavity; the front cover is provided with a first one-way sealing piece, and the first one-way sealing piece is used for buffering the moving tail end, moving in the first direction, of the piston piece. The rear cover is provided with a second one-way sealing piece, and the second one-way sealing piece is used for buffering the moving tail end, moving in the second direction, of the piston piece. The first direction is the direction from the rear cover to the front cover, and the second direction is the direction from the front cover to the rear cover. And the movement tail ends of the piston piece in different directions can be buffered, and impact caused by inertia is effectively reduced.

The invention relates to the technical field of electro-pneumatic valve state monitoring, in particular to a state monitoring and alarming method for an electro-pneumatic valve. The method comprises the steps of formulating a knowledge graph updating simulation schematic diagram, and updating association states of various state characteristics and fault types under different time nodes in real time; and predicting the fault type of the current electro-pneumatic valve according to the state characteristics acquired in real time and the updated mapping knowledge domain. According to the method, the knowledge graph updating simulation schematic diagram is formulated, the association state of each state feature and the fault type under different time nodes is updated in real time, the fault matching quantity and the change rate are used as association degree evaluation items of each state feature and the fault type, the relationship between each state feature and the fault type is accurately described, and the fault diagnosis accuracy is improved. A stable knowledge graph is established, the alarm degree is divided according to the predicted fault type and the dynamic association and grade of the current fault type and the state characteristics, early warning is performed according to the alarm degree, and the early warning effect is improved.

A system including a pumping cassette having a first side including number of valve wells and second side having a fluid bus. Each side may be covered by a flexible membrane. A control surface having a number of valve well control stations actuatable with respect to the flexible membrane covering the first side of the cassette to open and close the valve wells when the cassette is mated against the control surface may be included. A pressure distribution assembly having a positive and negative pressure source and a number of pneumatic valves may be included. A controller configured to selectively actuate the number of pneumatic valves to apply pressure against the valve well control stations in a valve pumping sequence until a volume displaced through the fluid bus of the pumping cassette from a source to a destination is within a range of a target volume may be included.

The invention discloses a dust removal and safety guarantee integrated system for coal mine underground drilling. Comprising a mining multi-parameter sensor, an electromagnetic pneumatic valve controller, a cyclone dust collector, a dry bag-type dust collector, a gas drainage pipeline, a dust extraction pipeline, a hole sealing dust extraction cover, a compressed air conveying pipe, an electromagnetic pneumatic valve, a front-stage air ejector, a rear-stage air ejector and an air extraction air ejector. The hole sealing dust extraction cover captures drilling dust, the drilling dust enters the cyclone dust collector through the dust extraction pipeline to separate large particles, and air outlet of the drilling dust is divided into two ways: the first way is connected with the gas drainage pipeline through the air extraction air ejector to convey harmful gas, and the second way is connected with the dry bag-type dust collector to filter fine particles. The mining multi-parameter sensor monitors the concentration, the pressure difference, the temperature and the humidity of CH4, CO and CO2, the electromagnetic pneumatic valve controller dynamically switches gas circuits based on data, dust collection, gas drainage, water isolation and fire prevention and control are achieved, the drilling operation safety and the environment quality are remarkably improved, and the device is suitable for a high-gas mine.

The utility model discloses a closed powder feeding device which comprises a steel frame platform, an upper-layer support, a main material metering system, a compensation feeding metering system, a vacuumizing pipeline, a microbead feeding system, a vacuum system, a weight sensor and a conveying pipeline. The main material metering system and the compensation feeding system are located on the uppermost portion of the whole device, and the microbead feeding system, the vacuum system and the steel frame platform are all installed on the ground. A main material transfer hopper in the main material metering system is connected with a vacuum system through a vacuumizing pipeline, the main material metering system and the compensation feeding metering system are both installed in a suspension mode and fixedly supported on a main material weight sensor on an upper-layer support, and the main material weight sensor is connected with the device control system and detects the feeding weight in real time. And the microbead feeding system is communicated with the main material metering system through a pneumatic valve and a conveying pipeline. A secondary feeding mode is adopted, the self-cleaning effect of the pipeline is achieved through simple valve layout and control, and a traditional mode that a feeding pipeline is cleaned through a draught fan is replaced.

The utility model discloses a switchable pneumatic flap valve which comprises a base, a collecting cavity is formed in the base, a first pneumatic valve plate and a second pneumatic valve plate are arranged in the collecting cavity, the first pneumatic valve plate is located above the second pneumatic valve plate, and the second pneumatic valve plate is located above the first pneumatic valve plate. The first pneumatic valve plate and the second pneumatic valve plate each comprise an air cylinder, a swing rod and a flap valve, the flap valves are fixedly connected with the swing rods, the swing rods are rotationally connected with the base, one ends of the air cylinders are hinged to the base, the other ends of the air cylinders are hinged to the swing rods, a cavity is formed in the base, and cooling liquid is contained in the cavity. According to the switchable pneumatic flap valve, discharging of material flows such as large wood shavings can be stably controlled, meanwhile, cooling liquid in the cavity is used for cooling, and the risk of fire disasters is reduced.

A system including a pumping cassette having a first side including number of valve wells and second side having a fluid bus. Each side may be covered by a flexible membrane. A control surface having a number of valve well control stations actuatable with respect to the flexible membrane covering the first side of the cassette to open and close the valve wells when the cassette is mated against the control surface may be included. A pressure distribution assembly having a positive and negative pressure source and a number of pneumatic valves may be included. A controller configured to selectively actuate the number of pneumatic valves to apply pressure against the valve well control stations in a valve pumping sequence until a volume displaced through the fluid bus of the pumping cassette from a source to a destination is within a range of a target volume may be included.

The automatic material changing device comprises at least two material barrels provided with pneumatic valves, a connecting plate, a rack, an air cylinder, a collecting barrel and an industrial personal computer, the connecting plate is connected to the rack in a sliding mode and located below a feeding mechanism, the material barrels are installed on the connecting plate, and the air cylinder is installed on the connecting plate. The collecting barrel is installed on the connecting plate and located below the connecting plate, the air cylinder is arranged on the rack to drive the connecting plate to slide, and the industrial personal computer is in communication connection with the air cylinder and the pneumatic valve. The device has the beneficial effects that residual raw materials are used up, and waste of the raw materials is reduced; the equipment is automatically driven to replace the color masterbatch, so that the production efficiency is improved, and the influence of shutdown and startup lifting speed on the product quality is improved; and the manual operation cost is reduced.

The invention relates to a flushing device for preventing crystallization of a liquid supply pipeline and a control method thereof, and belongs to the technical field of semiconductor wafer processing equipment.The flushing device comprises a four-way connector, a flushing water supply pump, an LM machine table, a rough polishing mixing barrel and a KOH barrel are arranged on the periphery of the four-way connector, and a flushing water inlet pipe is arranged between the flushing water supply pump and the four-way connector; a pneumatic valve II is arranged on the flushing water inlet pipe, a machine table liquid supply pipe is arranged between the LM machine table and the four-way connector, a rough polishing liquid supply pipe is arranged between the rough polishing mixing barrel and the four-way connector, a pneumatic valve III is arranged on the rough polishing liquid supply pipe, a KOH pipe is arranged between the KOH barrel and the four-way connector, and a pneumatic valve I is arranged on the KOH pipe. By means of the four-way connector and the four valves, switching of various complex functions is achieved, and the structure is compact. And not only is back flushing achieved, but also an innovative cross-pipeline circulating flushing and comprehensive cleaning mode is achieved, and different types of crystals and pollution can be effectively handled. Liquid is flushed back to an original barrel through back flushing, a KOH solution is repeatedly utilized through a circulating flushing mode, and waste of chemicals and water is reduced.

The invention provides a multi-melting-machine collaborative vacuumizing control system and control method, and belongs to the technical field of quartz crucible manufacturing, the multi-melting-machine collaborative vacuumizing control system comprises a main controller, a main vacuumizing assembly, a plurality of branch vacuumizing assemblies and a plurality of melting machines; the main vacuumizing assembly is connected with the multiple branch vacuumizing assemblies through the vacuum main pipeline, and the multiple branch vacuumizing assemblies are connected with the multiple melting machines in a one-to-one correspondence mode through the melting machine connecting vacuum pipes. The main vacuumizing assembly comprises a vacuum pump, a first pneumatic valve, a first proportional electromagnetic valve, a vacuum tank and a vacuum main valve which are connected in sequence; the branch vacuumizing assembly comprises a vacuum proportion regulating valve, a buffer tank and a vacuumizing valve which are connected in sequence; a vacuum tank is arranged, and the vacuum pressure in the vacuum tank is kept constant by controlling a first pneumatic valve and a first proportional electromagnetic valve; the buffer tanks are arranged on the branches, and the vacuum pressure in the buffer tanks is controlled by the vacuum proportioning valves to be kept constant, so that a stable vacuum system is formed in the melting process of the quartz crucible.

The utility model relates to the technical field of PEM electrolytic baths, and provides a high-pressure drainage system based on a PEM electrolytic bath, which comprises a circulating water pump arranged at an inlet of the PEM electrolytic bath, a pressure sensor arranged at an outlet of the PEM electrolytic bath, and a primary gas-liquid separator, a pressure sensor and a second-stage gas-liquid separator are arranged at an outlet of the first-stage gas-liquid separator, the second-stage gas-liquid separator is provided with an upper liquid level sensor and a lower liquid level sensor, a back pressure valve is arranged at a gas outlet of the second-stage gas-liquid separator, and two pneumatic drain valves which are connected in parallel are arranged at a liquid outlet of the second-stage gas-liquid separator. A needle valve is arranged behind the pneumatic drain valve, and a needle valve is arranged behind the pneumatic drain valve. High-pressure and low-pressure drainage is performed by introducing the parallel pneumatic valve and the needle valve in a manner of dividing pressure levels and dividing drainage durations, so that the effects of discharging excessive water in equipment and keeping back pressure stable can be achieved during drainage under different pressure levels.

The invention relates to the technical field of automobile noise reduction, in particular to an active noise reduction composite silencer which comprises a containing shell, a plurality of partition plates are arranged in the containing shell and divide an inner cavity of the containing shell into a pressure relief cavity, a head noise reduction cavity, an expansion cavity, a tail noise reduction cavity and a cavity, an air inlet pipe is connected to the containing shell, and the front partition plate and the rear partition plate are removed. And a first-stage noise reduction mechanism and a second-stage noise reduction mechanism are arranged in the head noise reduction cavity and the tail noise reduction cavity correspondingly, a high-pressure pneumatic valve is further arranged in the head noise reduction cavity, a first exhaust pipe and a second exhaust pipe are arranged in the containing shell, and perforated passive noise reduction mechanisms are arranged on the first exhaust pipe and the second exhaust pipe. The first-stage noise reduction mechanism plays a leading role in low-frequency noise reduction, and the second-stage noise reduction mechanism plays a leading role in high-frequency noise reduction, so that in the actual driving process, waste gas noise generated in different driving states of an automobile can be dynamically adapted through the first-stage noise reduction mechanism and the second-stage noise reduction mechanism.