195results about How to "Small pressure fluctuations" patented technology

The invention provides a fuel cell hydrogen supply system and a hydrogen supply method. The fuel cell hydrogen supply system comprises a liquid hydrogen storage tank, a first gas path connected between the liquid hydrogen storage tank and a fuel cell, a second gas path connected in parallel with the first gas path, and a control assembly, a gasification device is arranged on the first gas path, and a gas storage bottle is arranged on the second gas path; the control assembly comprises a controller and a plurality of control valves; the controller controls the plurality of control valves and can respectively control the connection or disconnection of the first gas path and the second gas path, so that the liquid hydrogen in the liquid hydrogen storage tank is conveyed to the fuel cell through the first gas path, and when the pressure of the gaseous hydrogen in the liquid hydrogen storage tank exceeds a first preset pressure threshold value, the gaseous hydrogen is stored in the gas storage bottle through the second gas path; and hydrogen can be supplied to the fuel cell through the second gas path. According to the fuel cell hydrogen supply system, gaseous hydrogen exceeding the first preset pressure threshold in the liquid hydrogen storage tank can be recycled, so that the release of the gaseous hydrogen to the outside is reduced, and the waste of resources is reduced.

The invention discloses a high-precision concrete liquid penetration test integrated system and a use method. The system comprises a closed liquid containing box, a self-absorption turbine, a tank body, an upstream high-precision flow meter, a downstream high-precision flow meter, a data acquisition port set, a downstream data acquisition port set, a liquid pressure detector, a digital display differential pressure sensor, a concrete permeation device and a multi-channel recorder. The system can comprehensively collect the flow velocity, the surface pressure and the up-down pressure difference before and after the liquid flows through the concrete test piece, and synchronously display real-time data to computer software. Synchronous data acquisition ensures the accuracy of test data under different boundary conditions, and the system provided by the invention can accurately measure the permeability of concrete test pieces with different shapes and different fracture states under different pressures on the premise of not influencing the structural integrity of the test pieces.

The invention provides a cable insulation material for large-length extrusion, a preparation method and application of the cable insulation material and a cable. The cable insulation material for large-length extrusion comprises polyethylene, an antioxidant, a cross-linking agent and a cross-linking aid. According to the cable insulation material for large-length extrusion provided by the invention, the insulation material is subjected to blending modification from a formula stage, and the prepared insulation material is small in pressure fluctuation, good in stability and smooth in discharging when being subjected to large-length extrusion by regulating the property of polyethylene and adopting the specific antioxidant and the cross-linking agent for cooperative use; therefore, the stability of the insulating material during large-length extrusion is improved. In addition, the cable insulation material is excellent in quality, has excellent thermal stability, scorching resistance, electrical insulation performance and aging resistance, and is of great significance in improving the market competitiveness of cable products.

The utility model relates to a secondary ink cartridge assembly for a printer, which comprises a secondary ink cartridge body, the secondary ink cartridge body comprises an ink cartridge body and an ink cartridge cover which are mutually sealed and covered, a high-pressure ink cavity, a low-pressure ink cavity and a normal-pressure ink cavity are arranged in the ink cartridge body, and the high-pressure ink cavity, the low-pressure ink cavity and the normal-pressure ink cavity are respectively provided with a liquid level sensor. The high-pressure ink cavity is sequentially communicated with the printing spray head, the low-pressure ink cavity, the normal-pressure ink cavity, the second ink pump, the bubble removing device and the first ink pump, so that ink flows out of the high-pressure ink cavity, sequentially flows through the printing spray head, the low-pressure ink cavity, the second ink pump, the normal-pressure ink cavity, the first ink pump and the bubble removing device and then flows back into the high-pressure ink cavity, and therefore a self-circulation ink path is formed. According to the secondary ink box, ink between the secondary ink box body and the printing spray head keeps continuous circulating flow, precipitation is avoided, the temperature of the ink entering the printing spray head is appropriate and constant, the bubble content is small, the pressure fluctuation is small, and therefore the printing quality is higher, and the printing effect is better.

The invention discloses a plunger gas lift well group peak shifting well opening and closing scheduling optimization method. The method comprises the following steps: acquiring plunger gas lift well group field data; a plunger gas lift well group production operation scheduling collaborative optimization mixed integer linear programming model described based on discrete time, namely an MI LP model; a plunger gas lift well group production operation scheduling collaborative optimization M ILP model solving method based on a genetic algorithm; obtaining a plunger gas lift well group peak shifting scheduling feasibility scheme under different objective functions; and evaluating and optimizing the effect of the plunger gas lift well group peak shifting scheduling feasibility scheme. According to the method, an automatic optimization method is adopted, the intensity of manual decision making and possible errors are reduced, and the scheduling efficiency and accuracy are improved; the genetic algorithm is adopted for optimization solution, an approximate optimal solution can be obtained in a short time, and the method is suitable for the scheduling problem of large-scale well groups.

The invention relates to the technical field of valves, in particular to a gate valve with a buffering function, which comprises a valve body, an inlet end and an outlet end which are arranged on the valve body, and a gate plate which is arranged between the inlet end and the outlet end on the valve body in a lifting manner, the fixed circular plate is fixedly arranged on the valve body and located in the outlet end, the fixed rod is arranged on the left end face of the fixed circular plate, and the buffer circular plate is arranged on the fixed rod in a sliding mode and used for being pushed by water flow to slide rightwards on the fixed rod when the gate plate is opened. The compression buffer spring is arranged between the left end face of the fixed circular plate and the right end face of the buffer circular plate and used for buffering water flow impact when the buffer circular plate slides rightwards on the fixed rod and pushing the buffer circular plate to slide leftwards on the fixed rod when the gate plate is closed; an anti-falling plate is arranged at the position, located on the left side of the buffering circular plate, of the left end of the fixing rod and used for preventing the buffering circular plate from sliding leftwards on the fixing rod.

The invention relates to the field of pressure difference control, in particular to a clean room pressure difference self-adaptive control method, device and equipment and a medium. The method comprises the steps that the current air flowing state of the clean room can be accurately reflected by obtaining the air supply amount data and the air return amount data in real time, and the requirement for pressure change in the clean room can be more accurately reflected according to the maximum pressure difference air amount determined on the basis of the data. By establishing the first air leakage quantity fluctuation function corresponding to the basic pressure difference air quantity fluctuation value, namely by considering the air leakage quantity caused by the sealing condition of the clean room, tiny pressure fluctuation possibly existing in the clean room can be considered and adapted, and therefore the precision of pressure difference control of the clean room is improved.

The invention provides a hydraulic system power balance optimization design method and system, and relates to the technical field of hydraulic systems.The method comprises the steps that sensors are arranged to collect real-time data and historical load data of a hydraulic pump, a motor and a hydraulic cylinder; then, analyzing historical load data by using a linear regression model to construct a load prediction model, and providing accurate prediction for the load demand at the next moment; then, the efficiency of the hydraulic system and the motor is calculated according to the prediction result and real-time data, and power distribution is conducted according to the load requirement; finally, comprehensive safety monitoring indexes are calculated by analyzing data such as pressure, flow and temperature of the hydraulic system, so that the system state is judged, and corresponding maintenance measures are implemented. The method not only optimizes the power distribution, but also enhances the safety and reliability of the hydraulic system, and has a wide application prospect.

The invention discloses an automatic cooling circulation system and method for a high-voltage direct-current circuit breaker, and the system comprises a machine body water jacket nested at the outer side of the circuit breaker, takes away the heat generated by the circuit breaker through the circulating flow of a cooling liquid, provides cooling liquid circulation power through a water pump, and increases the heat dissipation area of the cooling liquid through a heat dissipation net. Heat exchange between cooling liquid and air is conducted, a fan is used for blowing air to a heat dissipation net, heat dissipation is accelerated, meanwhile, electric arcs of a circuit breaker are lengthened through blowing, impedance of the circuit breaker is increased, the system is connected into a diaphragm type expansion tank and a water tank, and the pressure in a cooling circulation system pipeline is adjusted. The system is high in automation operation degree, the fan and the water pump can be prevented from being in a high-power working state under the condition that the temperature is not high, the service life of equipment is prolonged, meanwhile, the system can meet the requirements of different temperature working conditions, and the application range is wide.

The utility model discloses a combined impeller and a turbine, belongs to the technical field of turbines, and adopts the main technical scheme that the combined impeller comprises a rotating part and a driving part, the multiple layers of blades are installed on the rotating part, the blades in part of layers are composite blades, the blades in part of layers are axial flow blades, and the blade layers with the axial flow blades are arranged adjacently; the length of the projection of the blade root chord D of each axial flow blade on the axis of the impeller is the projection length H, and the distance between adjacent layers with the axial flow blades is 1 / 5H-1 / 3H. The turbine solves the problems that when fluid passes through an existing turbine, large air volume and high air pressure can not be provided at the same time in a small space size, and turbulence and too large noise are generated at the same time.

An oxygen balance tank is provided with a tank body, a supporting plate is arranged at the bottom of the tank body, supporting legs are arranged on the supporting plate, locking holes are formed in the supporting legs, locking bolts are assembled in the locking holes, and liquid materials can enter the balance tank through a feeding port in the tank body. The balance film for pressure relief is arranged in the balance tank, gas generated during material reaction can be ejected out of the balance film by means of the flexible structure characteristic of the balance film, pressure gas can be released more gently, pressure fluctuation in the balance tank is small, and pressure balance in the balance tank can be achieved.

The utility model relates to the technical field of cyclone separators, in particular to a slug flow self-adaptive axial flow type gas-liquid cyclone separator which comprises a reducing outer cylinder, a vertical inner cylinder, a guide impeller, a horizontal inlet pipe and a side line guide pipe. One end of the vertical inner cylinder is connected with the bottom of the variable-diameter outer cylinder, and the other end of the vertical inner cylinder is connected with the horizontal inlet pipe through a right-angle bent pipe; one end of the lateral line conduit is connected with the horizontal inlet pipe, and the other end of the lateral line conduit is connected with the variable-diameter outer cylinder; and a flow guide impeller is arranged in the vertical inner cylinder. According to the utility model, gas with pressure is transferred into the variable-diameter outer cylinder by adopting the side line guide pipe, so that the pressure in the cylinder body is increased to a certain extent, the pressure difference between the cylinder body and the horizontal inlet pipe is reduced, slug flow is prevented from being formed from an inlet, and gas and liquid can enter the separator in a small-slug flow or mixed flow state. The slug flow can be weakened or even eliminated without external intervention, so that the separation performance of the axial flow type gas-liquid separator under a complex flow pattern is improved.

The invention belongs to the technical field of injection molding, and discloses an injection molding machine hydraulic system and an injection molding machine hydraulic control method. The injection molding machine hydraulic system, the oil tank, the output end of the first oil pump and the oil inlet P1 are sequentially communicated. And the first oil return control valve can selectively connect and disconnect the oil inlet / outlet E1 and the oil inlet / outlet F1. And when the oil inlet / outlet E1 is communicated with the oil inlet / outlet F1, the first rod cavity, the first oil return cartridge valve and the first rodless cavity are communicated in sequence. The oil inlet E2 and the oil inlet P2 both communicate with the output end of the first oil pump. And the second oil inlet control valve can selectively connect and disconnect the oil inlet E2 and the oil outlet F2. And when the oil inlet E2 is communicated with the oil outlet F2, the first oil pump, the second oil inlet one-way valve and the first rodless cavity are communicated in sequence. In the electric glue melting process, oil can be synchronously and accurately supplemented, the influence caused by vacuum generated in the first rodless cavity is reduced, the injection molding period can be shortened, the stability of the quality of a product obtained through injection molding is guaranteed, and energy consumption is reduced.

The utility model discloses a carbon decomposition device for producing borax decahydrate by using high-concentration carbon dioxide. The carbon decomposition device comprises nine carbon decomposition tanks, every three carbon decomposition tanks form a group, and three groups are connected in parallel; the upper part of each carbon decomposition tank comprises a serial-in end head, a carbon dioxide main pipe end head connected with a carbon dioxide main pipe, a discharging main pipe end head connected with a discharging main pipe, a feeding main pipe end head connected with a feeding main pipe, an emptying main pipe end head connected with an emptying main pipe, a tail gas main pipe end head connected with a tail gas main pipe and a serial-out end head; in each group, the serial-in end of each carbon decomposition tank is connected with the serial-out end of the adjacent carbon decomposition tank in series; a steam header pipe end connected with a steam header pipe is arranged on the side wall of the carbon decomposition tank; a steam condensate pipe is arranged at the lower part of the carbonolysis tank. According to the utility model, three tanks are connected in series for carbon decomposition reaction, so that the fluctuation of carbon dioxide pressure during discharging is reduced, the stability of system pressure is facilitated, and the absorption and carbon decomposition reaction of carbon dioxide are facilitated.

The invention relates to the technical field of damping and buffering, and discloses a hydraulic cylinder with damping and buffering functions, which comprises a cylinder barrel, a first end cover is fixedly clamped to the left side of the cylinder barrel, a buffering mechanism is slidably connected to the left side of the first end cover, and a second end cover is fixedly clamped to the right side of the cylinder barrel. A piston centering mechanism is fixedly connected to the right side of the second end cover, a hydraulic force increasing mechanism is fixedly connected to the outer surface of the first end cover, a first piston is slidably connected to the inner surface of the cylinder barrel, a first sealing ring is clamped to the outer surface of the first piston, and a piston rod is fixedly connected to the right side of the first piston. The position of the piston can be automatically adjusted, the piston can be well matched with the cylinder barrel, friction and vibration are reduced, hydraulic oil can flow between the piston and the cylinder barrel more smoothly, the working efficiency and stability of the hydraulic cylinder are improved, and the piston centering mechanism can absorb and buffer influences caused by external impact and load changes and protect the hydraulic cylinder.

The invention provides a double-cylinder air compressor, and belongs to the technical field of air compressors. The technical problem that an existing double-cylinder air compressor is large in noise is solved. The device comprises a crankcase, a driving motor is fixedly connected to the crankcase, the driving motor comprises a motor shaft, one end of the motor shaft extends into the crankcase, air cylinders are fixedly arranged on the two sides, perpendicular to the driving motor, of the crankcase respectively, and two connecting rods are fixedly connected to the motor shaft in a rotating mode. The ends, away from the motor shaft, of the two connecting rods are fixedly connected with pistons respectively, the two pistons are located in air cylinders respectively, the air cylinders are communicated with corresponding air outlet holes, the crankcase is communicated with an air inlet hole, and the air inlet hole can be communicated with the two air cylinders at the same time. The noise reduction device has a better noise reduction function.

The invention provides a coaxial driving device and a vehicle, the coaxial driving device comprises a shell, a stator and a rotor, the shell comprises an end cover, and the end cover is provided with a first overflowing channel; the rotor shaft is internally provided with a cavity, the cavity penetrates through the two ends of the rotor shaft, the rotor shaft is provided with a second hole, and the second hole is communicated with the cavity and the rotor; and the penetrating shaft is arranged in the cavity of the rotor shaft in a penetrating manner, one end of the penetrating shaft extends to the end cover, a second overflowing channel is formed in the penetrating shaft, and a third hole and a fourth hole which are communicated with the second overflowing channel are formed in the penetrating shaft. After flowing out of the first hole, the cooling medium can be cached in the buffer tank and fills the buffer tank, and the pressure of the cooling medium in the buffer tank is easy to increase. Therefore, under the condition that the penetrating shaft rotates at a high speed and the first hole and the third hole are staggered, the cooling medium can flow into the third hole, and the cooling effect on the rotor is guaranteed.

The utility model belongs to the technical field of pipeline drainage / drainage, and particularly discloses a sand washing drainage device which comprises a main drainage pipe and a throttling drainage pipe. The main water drainage pipe is used for being communicated with a low-concave node of a water conveying and distributing pipeline to form a main water drainage channel, and a water drainage opening of the main water drainage pipe is provided with a tail end switching device used for opening and closing the water drainage opening; the throttling water drainage pipe is connected to the periphery of the downstream of the main water drainage pipe in a bypass mode to form a branch water drainage channel, the pipe diameter of the throttling water drainage pipe is smaller than that of the main water drainage pipe, and the throttling water drainage pipe is connected with an adjusting valve used for adjusting the water drainage flow of the branch water drainage channel in series. And a filter is connected in series in the main water drain pipe or the throttling water drain pipe and is positioned at the upstream of the regulating valve. According to the sand washing drainage device, pipeline drainage / drainage can be safely and stably carried out under the condition of high pressure difference.

The utility model relates to the technical field of casting, in particular to a vacuum negative pressure device for lost foam casting. According to the technical scheme, the device comprises a mounting bottom plate, a vacuum pump is arranged above the mounting bottom plate, a pressure stabilizing assembly is arranged at the position, located on the mounting bottom plate, of the air inlet end of the vacuum pump, a filtering assembly is arranged on one side of the pressure stabilizing assembly, a negative pressure pipe is arranged on a connecting pipe, and a vacuum distribution mechanism is arranged at the end, away from the connecting pipe, of the negative pressure pipe. The filtering assembly adopts a multi-layer composite filtering structure, so that impurities in gas can be efficiently removed, meanwhile, the system pressure can be monitored and adjusted in real time through an intelligent central controller in the pressure stabilizing assembly, pressure fluctuation is effectively buffered, a stable negative pressure environment is provided for lost foam casting, and the production efficiency is improved. And meanwhile, the vacuum distribution mechanism is designed in a modularized mode, negative pressure distribution can be accurately controlled according to different production requirements, the air exhaust efficiency is improved, and the production efficiency of lost foam casting and the precision of castings can be improved.

The invention discloses a synthesis method of a high thickening lithium magnesium silicate, and belongs to the technical field of preparation of silicate materials. It uses sodium silicate, magnesium salt, and lithium salt as raw materials, and water as the main solvent, and reacts in a closed stirring reactor, the reaction temperature is 180-300 ° C, and carbon dioxide is introduced to control the reaction pressure at 2-6MPa. Carbon dioxide in a near-critical state acts as a secondary solvent and water to dissolve, transfer mass, and transfer heat, and reacts for 2-4 hours before separation and drying, and finally obtains lithium magnesium silicate with small particle size and low layer charge. The lithium magnesium silicate has excellent thickening ability, and its aqueous dispersion has extremely high light transmittance.

The invention relates to portable dual-mode valve detection equipment and a use method, and belongs to the field of valve detection. Comprising a control system module, a measurement module, a pressurization module and a wastewater management module, and the pressurization module comprises a water tank, a ball valve, a filter, a gas-liquid booster pump and an energy accumulator. The wastewater management module is used for managing and recycling wastewater flowing into the system from the water tank; one end of the ball valve is communicated with an outlet of the water tank and used for controlling output of the water tank; the other end of the ball valve is communicated with the filter; the gas-liquid booster pump communicates with the end, away from the ball valve, of the filter and is used for providing a pressure source for the energy accumulator in a high-pressure interval. The energy accumulator is communicated with the end, away from the filter, of the gas-liquid booster pump and used for maintaining the stability of a pipeline system and reducing the phenomena of pulse, vibration and the like. The equipment can perform dual-mode detection on various valves, is wide and stable in test pressure range, can better meet the requirements of convenience and high efficiency, and is suitable for various application scenes.

The application provides an environment simulation air extraction device cooperative optimization control method and system based on cooperative differential game, comprising the following steps: step 1, a dynamic model of the air extraction device is established. Step 2, the air supplement valve and the plurality of inlet valves are regarded as game participants, and a pressure-pressure ratio multi-objective optimization model based on cooperative differential game is constructed. Step 3, an approximate dynamic programming algorithm-critical neural network is combined to obtain an approximate Pareto optimal solution of the established game optimization model. Step 4, a cooperative optimization controller is designed: the inlet valve adopts PI control combined with a filter and an optimization item to realize cooperative control of pressure and pressure ratio. Step 5, on a multi-compressor parallel simulation platform, various complex working conditions such as valve leakage and compressor failure are set to verify the robustness and superiority of the algorithm. After the application of the technical scheme, the speed, robustness and anti-interference ability of the system based on the cooperative differential game cooperative optimization control algorithm are significantly improved.

The present invention provides a tunnel boring machine equipped with a high-pressure water jet cutting system and a combined excavation method, including a tunnel boring machine body, a flow pump group is arranged on the tunnel boring machine body, and a high-pressure water jet cutting system is arranged at the front end of the tunnel boring machine; the high-pressure water jet cutting system includes a water jet-mechanical combined cutter disc, a water jet-shell knife combined tool, a high-pressure water transmission pipeline, a multi-media rotation center and a water jet diverter valve block, wherein one end of the high-pressure water transmission pipeline is connected to the flow pump group, and the other end is connected to the multi-media rotation center, and the multi-media rotation center is connected to the water jet diverter valve block, and the high-pressure water is divided into multiple paths, which are respectively supplied to each water jet-shell knife combined tool on the water jet-mechanical combined cutter disc. The present invention provides practical suggestions and references for the overall design, optimization and spatial layout of the high-pressure water jet system.

The utility model belongs to the technical field of oil-gas separation, and particularly relates to an oil-gas separation and recovery device which comprises a venturi ejector, a high-pressure gas source, a cold air source and a recovery component, and the venturi ejector is provided with an oil steam inlet, a high-pressure gas inlet, a cold air inlet and an output port. The high-pressure gas inlet and the output port are oppositely formed in the two ends of the Venturi ejector, the oil steam inlet and the cold air inlet are formed in the side, close to the high-pressure gas inlet, of the throat pipe, and oil steam, high-pressure gas and cold air are introduced into the Venturi ejector through pipelines. The venturi ejector is connected with an output pipeline at an output port of the venturi ejector, and the recovery assembly is arranged on the output pipeline. High-pressure gas is introduced into the Venturi ejector, negative pressure is generated in the Venturi ejector to suck oil steam and cold air, the oil steam and the cold air are fully mixed at the throat pipe, the condensation phase change effect of an oil-gas mixture in the throat pipe and a follow-up pipeline is improved, and condensed oil drops are collected through the recovery assembly.

The utility model relates to the technical field of pipeline construction, in particular to a movable steam blowing device for installing a small pipeline, which comprises a movable trolley and a protective frame, a steam generator and a water tank are arranged on the movable trolley, a water supply pump is arranged on the water tank, a surge tank is arranged on the steam generator, and the surge tank is connected with the protective frame. A safety valve and a barometer are arranged on the surge tank, and a purging valve is arranged on one side of the surge tank; the steam generator comprises a heating cavity and a boiling cavity, the interior of the heating cavity is in an inverted concave shape, a preheating device is arranged at the bottom of the heating cavity, the boiling cavity is located on the upper side of the heating cavity, the boiling cavity and the heating cavity are communicated through a pipeline, and a temperature control assembly is arranged in the boiling cavity; the steam blowing small pipeline is adopted, the steam generator is provided with the heating cavity and the boiling cavity, water heating is separated, efficiency is improved, meanwhile, the pressure stabilizing tank is arranged, steam pressure fluctuation is reduced, pressure storage and pulse blowing can be achieved, and functionality and practicability of equipment are improved.

The utility model relates to the technical field of silicon steel production and processing, disclose a kind of non-oriented silicon steel coating spraying device, including shell, relative arrangement is provided with smearing subassembly in the shell, the shell bottom is provided with recovery subassembly, the inside of shell is provided with spray device, the inside of shell is fixedly connected with not less than one guide roller, the smearing subassembly includes the slide rail of fixed connection in the inner wall of shell top, shell side wall is fixedly connected with electric push rod, the output end of electric push rod is fixedly connected with support plate, the bottom of support plate is fixedly connected with not less than one telescopic link, spring is equipped on the surface of telescopic link. In the utility model, through the structural setting of smearing subassembly, it solves the problem that coating is difficult to evenly cover the surface of silicon steel after the surface of silicon steel is sprayed in the prior art, coating stripe defect or the phenomenon of missing coating is prone to occur, and product quality is difficult to guarantee.

The application discloses a hydraulic system for stabilizing pressure of a hot-pressing sintering aluminum nitride heater, which comprises a main oil tank and a stamping oil cylinder; the main oil tank is connected with a first main oil path, the first main oil path is connected with an upper cylinder total oil path and a lower cylinder oil path through a first two-position cartridge valve, the upper cylinder total oil path is connected with an inner cylinder oil path and the main oil tank through a second two-position cartridge valve, and an outer cylinder oil path is connected with the inner cylinder oil path through a cartridge valve; the first main oil path, a second main oil path and a third main oil path are connected with a pressure compensation main oil path; a first hydraulic control check valve is arranged on the inner cylinder oil path and the outer cylinder oil path, the first hydraulic control check valve is connected with a first pressure relief oil path connected with the second main oil path, and the inner cylinder oil path and the outer cylinder oil path are connected with a second pressure relief oil path between the first hydraulic control check valve and the stamping oil cylinder. The design of the inner cylinder and the outer cylinder can realize controllable pressure relief range of the stamping oil cylinder, the pressure relief oil path makes the stability of the pressurizing rate good, and the pressure fluctuation is small during the pressure relief process.

In a method for producing various syngases by electrolysis, the method comprises feeding steam and compressed air to a cathode and an anode of an electrolysis unit, respectively, or to a cathode and an anode in a first one of a series of electrolysis units, into the first one of the series of electrolysis units, the electrolysis units operating at elevated air pressure, the oxygen-rich gas exiting the anode is then expanded as low as approximately ambient pressure using a gas expander. The electrolysis unit is preferably a solid oxide electrolytic cell (SOEC) stack.

The invention provides a waterway system of a coffee machine, and relates to the technical field of coffee machines, the waterway system comprises a water tank, an electromagnetic pump, a boiler and a coffee extractor which are connected in sequence, the electromagnetic pump and the boiler are connected through a pressure stabilizing pipe, and the pressure stabilizing pipe is a silicone tube sleeved with a fiber woven structure. The pressure stabilizing pipe is arranged between the electromagnetic pump and the boiler, the pressure stabilizing pipe is arranged to be the silica gel pipe sleeved with the fiber woven structure, the length, the inner diameter and the outer diameter of the pressure stabilizing pipe are specified, pressure fluctuation of water flow in a pipeline is remarkably reduced, shaking of a meter hand of a pressure meter is remarkably reduced, and more accurate pressure reference is provided for a coffee maker.

The invention relates to a common rail type fuel injection device, which belongs to the technical field of power machinery and comprises an oil injector body, a coupling nut, a fixed sleeve and a nozzle which are arranged from top to bottom, a needle valve body is arranged on the inner side of the coupling nut and the inner side of the fixed sleeve, and a needle valve is arranged on the inner side of the needle valve body. A top cap, a cone valve sleeve and a needle valve spring are arranged on the inner side of the oil sprayer body from top to bottom, the needle valve upwards penetrates through the needle valve spring and the cone valve sleeve, the needle valve is connected with a cone valve element on the inner side of the top of the cone valve sleeve, a driving piston and a throttling screw plug are arranged on the inner side of the bottom of the top cap, the driving piston is located above the cone valve element, and the throttling screw plug is located above the driving piston. A sealing conical surface I is arranged on the inner side of the conical valve sleeve. The pressure fluctuation in the working process of the fuel injection device is weakened to a certain extent, and the injection characteristic in a high-pressure common-rail fuel injection system is improved.