39results about How to "Improved pressure stability" patented technology

The invention relates to the technical field of air pressure control, in particular to an air pressure test box pressure stability control method and system. The method comprises the following steps: carrying out current non-operation state monitoring on an air pressure test box so as to obtain multi-dimensional non-operation state monitoring parameters of the air pressure test box; performing non-running state time sequence change evolution on the multi-dimensional non-running state monitoring parameters so as to generate non-running state time sequence characteristics; acquiring an internal structure diagram of the air pressure test box; performing spatial topology distribution analysis on the internal structure diagram of the air pressure test box based on non-operation state time sequence characteristics, performing three-dimensional point cloud modeling, and constructing a digital twin model of the test box; obtaining a target test scene based on the test log; performing target pressure state analysis on the target test scene, and performing final test scene state mining to obtain final test scene state data; according to the invention, high-controllability and high-precision pressure control of the air pressure test box is realized.

The invention discloses a supercharging optimization control method based on ignition efficiency, which comprises the following steps of: periodically detecting a supercharging closed-loop enabling condition for an engine, and when the state of the engine is changed from a state meeting the supercharging closed-loop enabling condition to a state not meeting the supercharging closed-loop enabling condition, starting the ignition efficiency; according to the ratio of the actual outlet pressure to the actual inlet pressure of the throttle valve and the current real-time rotating speed of the engine, the initial duration value when the target opening degree of the supercharging actuator is kept unchanged is determined; determining remaining time according to the duration initial value, and updating and optimizing the remaining time according to the ignition angle efficiency variable quantity to obtain optimized remaining time; and the optimized remaining time serves as the maintaining time of the opening degree of the pressurization actuator through pressurization closed-loop enabling, and the pressurization process is controlled according to the maintaining time. According to the method, the problems of control smoothness and stability possibly caused when the pressurization closed loop is quitted are optimized, and the stability of the air inlet pressure and the pressure of an outlet of the supercharger in the quitting process of the pressurization closed loop is improved.

The invention relates to a ceramic product and a preparation method thereof, in particular to a preparation method of a carbon-ceramic brake disc with a composite friction layer and the carbon-ceramic brake disc, which are used for overcoming the defects that the production cost is increased and the large-scale application of the carbon-ceramic brake disc is restricted due to low material utilization rate in the manufacturing process of the carbon-ceramic brake disc. The preparation method of the carbon-ceramic brake disc with the composite friction layer sequentially comprises the following steps of preparation of the carbon-carbon composite material, rough machining, preparation of the heat conduction functional layer, preparation of the composite friction layer, ceramic treatment and finish machining. The heat conduction function layer can effectively reduce the temperature of the disc face in the braking process, the service life of calipers and other surrounding accessories is prolonged, the components of the composite friction layer are uniform and can be designed, and noise and shaking can be reduced in the braking process; in addition, the utilization rate of raw materials is improved and the production cost is reduced by using the residual stub bar. Meanwhile, the invention further discloses a carbon ceramic brake disc with the composite friction layer.

The invention discloses an integrated high-performance LDMOS device and a preparation method thereof, and the method comprises the steps: forming a first polysilicon layer at one side of a second well region, a third well region and an oxide layer, forming a second polysilicon layer at the other side of the oxide layer, and forming resistive field plates which are located between the first polysilicon layer and the second polysilicon layer and are arranged on the oxide layer at intervals, resistive field plates are arranged in the LDMOS device, an equipotential ring is formed between the resistive field plates, the resistive field plates and the equipotential ring are arranged between a gate and a drain of the LDMOS device at intervals, only a thin silicon dioxide film layer is arranged between the surface of a drift region of the device and the resistive field plates at intervals, one side of each resistive field plate is connected with a drain electrode high potential, and a source electrode is connected with a lowest potential. A weak leakage current passing through the resistive field plate exists between the source electrode and the drain electrode, so that the surface electric field distribution between the grid electrode and the drain electrode of the device is more uniform, the peak electric fields near the grid electrode and the drain electrode are greatly weakened, the voltage resistance of the device is improved, and the HTRB reliability of the device is improved.

The invention discloses an integrated high-performance LDMOS device and a preparation method thereof. The invention forms a first polysilicon layer on a second well region, a third well region and one side of an oxide layer, forms a second polysilicon layer on the other side of the oxide layer, forms a resistive field plate between the first polysilicon layer and the second polysilicon layer and arranged at intervals on the oxide layer, and forms an equipotential ring between the resistive field plates. The resistive field plate and the equipotential ring are arranged at intervals between the gate and drain of the LDMOS device. Only a thin silicon dioxide film layer is spaced between the surface of the drift region of the device and the resistive field plate. One side of the resistive field plate is connected to a high potential of the drain, and the source is connected to a minimum potential. When the device is reverse biased, there is a weak leakage current between the source and the drain through the resistive field plate, so that the surface electric field distribution between the gate and the drain of the device is more uniform, the peak electric field near the gate and the drain is greatly weakened, the voltage resistance performance of the device is improved, and the HTRB reliability of the device is improved.

The invention discloses an intelligent pressure reducing valve and a remote dynamic control system, and relates to the field of pressure reducing valve control, and the intelligent pressure reducing valve comprises a main valve body arranged on a water pipeline, a digital pressure stabilizing controller used for locally operating and setting a target pressure value, and a sensor module used for collecting pressure and flow real-time data, the electric pilot valve is used for receiving a control signal of the digital voltage stabilization controller and adjusting the opening degree of the main valve body; closed-loop control logic is adopted in the whole working process, accurate and stable control over the outlet pressure is achieved through the cooperative working mode of real-time collection of the sensor module, analysis and judgment of the digital pressure stabilization controller and dynamic adjustment of the electric pilot valve, and the core technical effects of working condition self-adaption, accurate and stable pressure and intelligent linkage operation and maintenance are achieved. Data are collected in real time through the front-end pressure / flow sensor and the rear-end pressure / flow sensor, when the rear-end pressure deviates from the target pressure value, the opening degree of the electric pilot valve is dynamically adjusted, pressure drift and oscillation of a traditional valve are avoided, and the pressure stability of a water supply pipe network is remarkably improved.

A test device of a plunger pump comprises an adapter, a liquid outlet pipeline, a liquid return pipeline, a direction control valve, a data collector, a hydraulic pressure regulator and a controller. The adapter is sealingly connected to a liquid inlet end of the plunger pump. One end of the liquid outlet pipeline is connected to the adapter, and the other end of the liquid outlet pipeline extends into an external test liquid. One end of the liquid return pipeline is connected to the adapter, and the other end of the liquid return pipeline extends into the external test liquid. The direction control valve is arranged at the connection between the liquid return pipeline and the adapter. The data collector is arranged in the liquid outlet pipeline to collect the hydraulic pressure value in the liquid outlet pipeline. The hydraulic pressure regulator is arranged in the liquid outlet pipeline to regulate the hydraulic pressure value in the liquid outlet pipeline. The controller is electrically connected to the plunger pump to control the liquid inlet and the liquid return of the plunger pump, and is electrically connected to the hydraulic pressure regulator and the data collector to receive a preset test hydraulic pressure value input by a user to control the hydraulic pressure regulator to regulate the hydraulic pressure value in the liquid outlet pipeline to the preset test hydraulic pressure value. The application realizes automatic testing of the plunger pump under different hydraulic pressures, and improves the testing efficiency.

This utility model discloses a water-cooled vacuum capacitor, comprising: an insulating shell and two electrode groups. Each electrode group includes an electrode disk and an electrode ring group fixed to the electrode disk. The insulating shell is sealed and connected to the two electrode disks to form a vacuum chamber. The two electrode ring groups are coupled and housed within the vacuum chamber. At least one electrode disk has a water-cooling chamber inside, and also has an inlet and an outlet communicating with the water-cooling chamber. By incorporating a water-cooling chamber within at least one electrode disk, this utility model can directly cool the electrode group from the heat source, significantly improving heat dissipation efficiency, enhancing the voltage withstand stability of the vacuum capacitor, reducing the impact of high temperature on capacitance, thereby ensuring impedance matching of the equipment, improving the electrical performance stability of the vacuum capacitor under high-frequency conditions, and meeting users' requirements for high current and voltage withstand stability of vacuum capacitors.

The invention discloses a pump body assembly, a compressor and air conditioning equipment, and relates to the technical field of compressors, the pump body assembly comprises a first air cylinder, a second air cylinder and a partition plate, and an exhaust hole of the second air cylinder communicates with a backpressure cavity through an air guide channel; the cross section area of the air guide channel is S1, the cross section area of the exhaust hole of the second air cylinder is S2, and the ratio of S1 to S2 meets the relation that S1 / S2 is larger than or equal to 0.3 and smaller than or equal to 1.2. The length of the air guide channel is L, the diameter of the air guide channel is D, and the ratio of L to D is 1 < = L / D < = 5. According to the scheme, by limiting the ratio (S1 / S2) of the sectional area S1 of the air guide channel to the area S2 of the exhaust hole of the second air cylinder, enough air flows to the back pressure cavity, and therefore the pressure of the back pressure cavity is maintained; the ratio (L / D) of the length L to the diameter D of the communicating hole reduces the pressure loss in the gas flowing process, and the problem that the slip sheet is separated from the outer diameter of the piston roller can be solved.

This application discloses a filtration device and a dishwasher. The filtration device includes a water collection shell, a filter assembly, and a push-suction component. The water collection shell has a water collection cavity with an inlet at the top. The filter assembly includes a primary filter and a secondary filter arranged sequentially along the water flow direction. The secondary filter is disposed within the water collection cavity, dividing the cavity into an inner filter cavity and an annular outer cavity surrounding the inner filter cavity and communicating with the inlet. The secondary filter includes a top sealing cap and a cylindrical filter screen disposed below the top sealing cap. The push-suction component includes a push surface and a suction surface arranged opposite to each other along the direction of rotation. During rotation, the push surface exerts a radial component of its pushing force on the water to push the water out of the annular outer cavity. During rotation, the suction surface exerts a radial component of its suction force on the water to draw the water into the inner filter cavity. The technical solution of this application can improve the filtration efficiency of the filtration device.

The application discloses a steam back pressure stabilizing method, device, equipment and medium, comprising: obtaining the outlet steam pressure and the inlet steam flow of a target steam turbine, and obtaining the standby steam flow of a target heat user; the target steam turbine provides required steam for the target heat user; determining the main adjustment parameter of the speed regulating valve of the target steam turbine according to the outlet steam pressure and the set outlet given pressure; determining the secondary adjustment parameter of the speed regulating valve according to the standby steam flow and the inlet steam flow; adjusting the opening of the speed regulating valve according to the main adjustment parameter and the secondary adjustment parameter. The application adjusts the opening of the speed regulating valve of the steam turbine based on the outlet steam pressure and the inlet steam flow of the target steam turbine, and the standby steam flow of the target heat user, so that the matching degree of the outlet steam pressure of the target steam turbine and the standby steam flow of the target heat user is improved, and the steam system pressure stability is improved in the case that the heat user consumption fluctuates greatly.

The utility model discloses a gas sensor packaging structure and a gas concentration detector, the gas sensor packaging structure comprises a packaging shell and a sealing plate; a detection cavity is formed in the packaging shell, an air inlet and an air outlet are formed in one side of the packaging shell, a glue filling groove is formed in the other side of the packaging shell, and a detection opening is formed in the bottom of the glue filling groove; the detection cavity is sequentially communicated with an air inlet channel, a detection channel and an air outlet channel, the air inlet channel is communicated with the air inlet, the detection channel is communicated with the detection port, and the air outlet channel is communicated with the air outlet; the sealing plate is arranged in the glue pouring groove, an induction assembly is fixed to the sealing plate, the induction assembly is arranged towards the detection opening, and the sealing plate covers the detection opening. The utility model can solve the problem of long-term stability of the sensor.

The application discloses a high-stability constant-pressure brush device and a generator, which comprise an outer cylinder, an inner cylinder, a brush rod and an elastic piece. The inner cylinder is sleeved in the outer cylinder, a sealed inner cavity is formed between the outer cylinder and the inner cylinder, the outer cylinder is provided with an inlet and an outlet which are communicated with the inner cavity, and the inlet and the outlet are used for circulating fluid medium to dissipate heat. The brush rod is slidably installed in the inner cylinder, the elastic piece is arranged in the inner cylinder, one end of the elastic piece abuts against the brush rod, and the other end of the elastic piece abuts against the brush rod, so as to provide constant axial compression force to the brush rod. The fluid circulation inner cavity formed by the outer cylinder and the inner cylinder realizes efficient heat dissipation of the elastic piece and the brush rod, and high-temperature thermal recession is avoided. The elastic force of the elastic piece drives the brush rod to be in constant pressure contact, and the stability of the brush pressure is obviously improved.

This invention relates to the field of cable technology and discloses a composite cross-linked polyethylene insulated cable integrating signal and power transmission. The cable comprises, from the inside out, a composite core, an inner semi-conductive shielding layer, a composite cross-linked polyethylene insulation layer, and an outer semi-conductive shielding layer. The composite cross-linked polyethylene insulation layer is made by extruding and cross-linking raw materials containing the following parts by weight: 90-95 parts low-density polyethylene granules, 5.42-11.6 parts solid premix, and 0.7-2.0 parts liquid co-solution. The solid premix contains N,N'-m-phenylenebismaleimide and tetrabutyl titanate, and the liquid co-solution contains tetramethyltetravinylcyclotetrasiloxane and dicumyl peroxide. This invention anchors by constructing a coordination network, eliminates space charge and micropores in the insulation layer, improves withstand voltage, reduces signal attenuation, and ensures the long-term stability of the integrated power and signal transmission of the composite cable.

The utility model belongs to the technical field of diaphragm pneumatic valve, especially relates to a stable diaphragm pressing structure of pneumatic diaphragm valve diaphragm, including actuating mechanism casing, piston subassembly, spring, gas channel, the piston subassembly is connected swing axle, the lower extreme of swing axle is equipped with conical part, the below of conical part is equipped with diaphragm pressure axle, diaphragm pressure axle is used for the diaphragm pressing of diaphragm, the periphery of conical part is equipped with a plurality of ball bearings, ball bearings are located in the ball bearing movable cavity of diaphragm pressure axle, and conical part passes through ball bearing pressing diaphragm pressure axle action, the utility model provides a stable diaphragm pressing structure of pneumatic diaphragm valve diaphragm, under the same condition, the utility model's pressure stability is higher, and the force is bigger.

The utility model discloses extrusion device drive mechanism, including extrusion device, the extrusion device sets up on the fixed plate, the injection rod of extrusion device sets up on the lifting plate, be provided with the guide rod on the fixed plate, the lifting plate sets up on the guide rod, be provided with two groups of screw rod subassembly between the lifting plate with the fixed plate, two groups of screw rod subassembly are located the both sides of extrusion device respectively, and two groups of screw rod subassembly synchronous drive lifting plate elevating along the guide rod, the screw rod power device of screw rod subassembly sets up on the lifting plate, and is located the bottom of lifting plate.

The utility model discloses an engine methanol supply system which comprises a fuel pipeline, the fuel pipeline comprises a feeding pipeline, and a fuel stop valve and a pressure regulating valve are sequentially arranged on the feeding pipeline in the flowing direction of methanol. The methanol supply system further comprises a methanol rail pipe arranged on an engine body of the engine, the methanol rail pipe is provided with a methanol feeding port, and the feeding pipeline is communicated with the methanol feeding port. The methanol rail pipe is further provided with a rail pipe branch pipe, and methanol is supplied to the machine body through the rail pipe branch pipe; the methanol supply system of the engine further comprises a box body, and the fuel stop valve and the pressure regulating valve are both arranged in the box body. Through the use of the fuel stop valve and the pressure regulating valve, the methanol supply system of the engine can realize rapid and stable control of methanol pressure in the methanol rail pipe in a steady state and a transient state, and can improve the pressure stability of methanol injection from the methanol rail pipe to the engine body, thereby improving the working reliability of the engine.

The invention discloses a double-line dry oil lubrication system and method for a high-temperature fan-shaped section roller bearing, the double-line dry oil lubrication system comprises an electric lubrication pump, the electric lubrication pump is connected with a parallel double-line main oil pipeline, and an electric / electromagnetic directional valve is arranged between the parallel double-line main oil pipeline and the electric lubrication pump; the parallel-connection double-line main oil pipeline is connected with the parallel-connection double-line branch oil pipeline, an oil supply branch pipe is arranged on the parallel-connection double-line branch oil pipeline, each flow of the oil supply branch pipe is provided with a group of double-line oil distributors, inlets of the double-line oil distributors are connected with outlets of double-line pumps, outlets of the double-line oil distributors are connected into oil injection holes of roller bearing seats through the branch pipes, and the oil injection holes of the roller bearing seats are communicated with the oil supply branch pipe. Two groups of oil injection holes are symmetrically formed in the roller bearing seat, two groups of oil outlet holes are further formed in the roller bearing seat, the two groups of oil injection holes and the two groups of oil outlet holes are symmetrically formed in the radial direction of the roller bearing seat, and the parallel double-line main oil pipeline and the parallel double-line branch oil pipeline are made of stainless steel pipes.

The utility model relates to water tank technical field especially relates to an expansion type water tank. Its technical scheme includes the box, the water inlet of being located at the top of box, the water outlet of being located at the bottom of box, still includes the fixed installation in the telescopic expansion box of box, installs the constant pressure module of expansion constant pressure to the expansion box of both sides of box, the constant pressure module includes the transmission case and pressure chamber that intercommunication, the pressure chamber and transmission case fill liquid, the transmission case in sliding installation has with expansion fixed connection of sealing plate of box. The utility model adopts constant pressure module and can provide stable unchangeable system pressure, compares with nonlinear air bag, avoids pressure fluctuation, makes system pressure keep constant on the set operating point, no matter how much expansion water volume is, avoids the risk that air bag pressure sharply climbs in high pressure area, also eliminates the hidden danger that low pressure area buffer is insufficient, improves system pressure stability greatly, can realize effective volume utilization more.

The utility model discloses a pressure-regulating grinding head and grinding equipment. The pressure-regulating grinding head comprises a grinding tool, a power assembly and a pressurizing assembly, the grinding tool makes contact with a to-be-machined workpiece, the power assembly drives the grinding tool to a preset station, and the pressurizing assembly adjusts the pressure between the grinding tool and the to-be-machined workpiece and is arranged in the power assembly. The pressurizing pipeline is arranged in the grinding head, so that extra space occupied by an external pipeline is eliminated, the whole grinding device is more compact, and assembling in a limited space is facilitated. And due to the design of the built-in pipeline, the grinding head is not limited and hindered by an external pipeline when moving and overturning, and the flexibility and the operation efficiency of the grinding tool are improved. The built-in pipeline and the grinding head move synchronously, so that pressure fluctuation caused by asynchronism of inertia force and a grinding tool is avoided. And in addition, the shape and angle change of the internal pipeline are effectively controlled, and the pressure fluctuation is further reduced, so that the stability of the pressure applied to the grinding tool is improved.

The utility model relates to a kind of papermaking coating systems, including raw material tank, raw material tank is used to accommodate coating;Feed sieve, feed sieve is connected with raw material tank by pipeline communication;Conveying pump, conveying pump is set on the pipeline between feed sieve and raw material tank;Transfer tank, transfer tank is connected with feed sieve by pipeline, transfer tank is used to accommodate, buffer coating;First-stage sieve, first-stage sieve is connected with transfer tank by pipeline, first-stage sieve is used to filter coating;Circulating pump, circulating pump is set on the pipeline between transfer tank and first-stage sieve, circulating pump is used to circulate and transport coating;Coating machine, coating machine is connected with first-stage sieve by pipeline, coating machine is used to be coated to the coating on the surface of raw paper;Second-stage sieve, second-stage sieve is connected with first-stage sieve by pipeline, second-stage sieve is connected with transfer tank by pipeline, second-stage sieve is used to filter coating;And first conveying pipeline, first conveying pipeline one end is connected on the pipeline between conveying pump and feed sieve, first conveying pipeline other end is connected in second-stage sieve.

This invention proposes a screw barrel accessory for high-speed, high- and low-pressure blown film extrusion equipment, applicable to blown film extruders. The screw includes a feed end and a discharge end at its two ends. Along the axial direction from the feed end to the discharge end, the screw sequentially features equal-depth screw groove sections, wavy gradient screw groove sections, a diamond sorting area, another wavy screw groove section, and a four-in, four-out multi-channel structure. This invention optimizes material plasticization, dispersion, flowability, and pressure control through a combination of wavy screw grooves, a dense tooth structure, a diamond sorting area, and a through-hole structure. The wavy and gradient screw grooves utilize a special structure to perform multiple shearing and kneading operations on the material. Simultaneously, the orderly arrangement of functional sections and the reasonable axial segment dimensions ensure smooth and stable screw operation, making it suitable for long-term continuous operation in high-speed, high- and low-pressure blown film production lines. This reduces the defect rate, improves overall production efficiency and economic benefits, and the integrated structural design enhances the overall strength of the screw.

The application discloses a gas circulation reaction control method based on pressure change rate feedforward and related devices, and relates to the technical field of automatic control of chemical processes, and comprises the following steps: acquiring pressure data in real time and calculating a pressure change rate, when the absolute value of the pressure change rate meets a preset trigger condition, determining a target opening degree adjustment amount of a pressure regulating mechanism according to a numerical interval where the pressure change rate is located, and generating a feedforward control instruction, the lead perception of the pressure change trend replaces the dependence of traditional PID feedback control on deviation accumulation, significantly improves the inherent response lag characteristic of the traditional control mode, and effectively reduces the triggering of the equipment surge protection. Meanwhile, when the negative downward pressure change rate meets a preset sudden drop condition, a decoupling compensation instruction is generated to control the gas discharge mechanism to increase the gas discharge amount, thereby realizing the cooperative linkage of pressure regulation and gas discharge, and optimizing the pressure stability of the system under severe fluctuation conditions.

The application discloses a wind-resistant grading ring of an extra-high voltage transmission line and relates to the technical field of transmission lines. Due to the action of wind force, the grading ring and the connecting and fixing position are loose, the center position of the grading ring and the insulator string is deviated in a strong wind day, and the grading ring cannot be used. The wind-resistant grading ring of the extra-high voltage transmission line is provided with inclined surfaces between side clamping blocks and inner hole plates. In the process of fixing and installing, after the bolts are tightened, the gap between the inner clamping blocks and the side clamping blocks is formed into a zigzag at the edge of the clamping plate. The zigzag gap is used to limit the sliding between the clamping plate and the inner clamping plate. In the process of use, compared with the friction force between the connecting positions after the bolts are fixed, the wind force is resisted, the stability is better, and the wind-resistant stability of the connecting position of the grading ring is improved.

The present invention provides a glass capillary array for gas storage and a preparation method thereof, comprising the following steps: selecting a pressure-resistant glass material to prepare a glass tube with smooth inner and outer surfaces, and drawing and cutting it into a glass single tube; arranging and bundling the glass single tubes, and then drawing and cutting them under a vacuum state to obtain a plurality of glass multi-tube arrays; arranging the glass multi-tube arrays into a screen arrangement mold row by row to form a closely arranged screen segment; placing the arranged screen segment into a vacuum melting and pressing system, and pressurizing it under a preset temperature and vacuum environment, so that all the multi-tubes in the screen segment are melted and pressed into one; hanging and fixing the melted and pressed screen segment, and slowly placing one end into the effective temperature zone of a wire drawing furnace, and heat-insulating the screen segment within the required temperature, so that one end of the screen segment is melted into one, and the multi-tube structure is sealed; slowly cooling the screen segment to anneal it, and obtain the required glass capillary array. The method of the present invention effectively improves the overall pressure resistance of the glass capillary and eliminates the environmental restrictions brought by other sealed materials.

The application relates to the technical field of measuring devices, and discloses a battery core thickness gauge, which comprises a mounting portion, at least one guide rod, a sliding frame and a telescopic pressure applying assembly. The guide rod is arranged on the mounting portion, and an air floating bearing is arranged on the guide rod in a sliding mode. The sliding frame is connected with the air floating bearing, and a detection head is arranged at the first end of the guide rod in the axial direction of the guide rod. The driving end of the telescopic pressure applying assembly is connected with the sliding frame, so that the sliding frame can reciprocate along the axial direction of the guide rod, the accuracy of measurement can be improved, and the operation is simplified.

The utility model discloses a heat conduction pipe capable of bearing pressure, and belongs to the technical field of heat conduction pipes. The heat conduction pipe capable of bearing pressure comprises a shell, and a liquid absorption core is arranged on the inner wall of the shell; the pressure bearing mechanism is arranged in the shell and comprises a supporting pipe, the upper end and the lower end of the supporting pipe are connected with the upper end and the lower end of the interior of the shell correspondingly, the interior of the supporting pipe is of a hollow structure, and the upper end and the lower end of the supporting pipe are sleeved with a first reinforcing block and a second reinforcing block correspondingly. A plurality of third reinforcing blocks are arranged on the outer side of the supporting pipe and located between the first reinforcing block and the second reinforcing block in a winding mode, the first reinforcing block, the second reinforcing block and the third reinforcing blocks are the same in shape and size, and the third reinforcing blocks are distributed at equal intervals. And the practical value is high.

The invention belongs to the technical field of valves, and particularly relates to a 35 MPa heavy truck pressure reducing valve. Comprising a shell, the upper end face of the shell is provided with an electromagnetic valve and an overpressure release valve, the upper end face of the shell is provided with a release port and a pressure sensor interface, the two side end faces of the shell are provided with an inlet and an outlet respectively, the front end face of the shell is provided with a replacement stop valve, and the lower end of the shell is provided with a first-stage pressure reducing valve and a second-stage pressure reducing valve. And a waterproof ventilation valve is mounted on the first-stage pressure reducing valve. The high-pressure electromagnetic switch has the beneficial effects that the integration level is high, and the functions of a filter, a high-pressure electromagnetic switch, overpressure relief, a manual switch, a pressure sensor interface and the like are integrated; the secondary pressure reducing valve adopts a reverse unloading structure, and the flow direction and the action area are changed by machining a radial hole in the pilot valve element, so that the opening pressure and the opening degree of the pilot valve element are controlled, and the outlet pressure stability is improved.

The application discloses a dynamic jet flow cooling experimental device and a testing method, and belongs to the technical field of spray cooling, and comprises a nitrogen tank, a high-pressure water storage tank, a booster pump, a water tank, a self-excited oscillation jet flow nozzle, a simulated heat source and a data acquisition system. The nozzle structure with an oscillation cavity and a feedback channel is adopted, the main jet flow enters the nozzle, and a periodic sweeping oscillation jet flow is spontaneously formed by means of the wall attachment effect and the feedback return flow of the fluid itself, and the external mechanical control components, such as the electromagnetic valve, which are prone to mechanical fatigue, are not needed, and the stable pressure liquid supply circulating system of the 'gas-liquid mixed driving' is adopted, the periodic pressure fluctuation generated by the booster pump is absorbed by the gas phase space of the high-pressure water storage tank, and high-pressure long-period and high-stability continuous spraying is realized.

The utility model provides a stock bin and storage equipment, and belongs to the field of material storage, the stock bin comprises a charging barrel, a hopper and a reinforcing structure, the top of the hopper is communicated with the bottom of the charging barrel, the reinforcing structure is arranged on the periphery of the hopper and comprises a base and a reinforcing frame, the reinforcing frame comprises a first ring beam, a second ring beam, a straining beam and at least two inclined supporting beams, the first ring beam and the second ring beam are coaxial and are sequentially arranged at intervals from top to bottom, the second ring beam is erected on the top of the base, the straining beams are evenly arranged around the axis of the first ring beam, and the top ends and the bottom ends of the straining beams are connected with the first ring beam and the second ring beam respectively. The inner edge of the top of the first ring beam is connected with the connecting portion of the charging barrel and the hopper, the two inclined supporting beams are arranged between the straining beam and the hopper, one end of each inclined supporting beam is connected with the straining beam, and the other end of each inclined supporting beam is connected with the outer wall of the hopper. Compared with the prior art, the technical problem that an existing stock bin has the design defects of insufficient stability and the like is solved.