53results about How to "Little impact on flow" patented technology

The invention discloses a selective water-plugging agent and a preparation method thereof. The selective water-plugging agent consists of the following raw materials by weight portion: 38 to 48 portions of polyacrylamide, 49 to 65 portions of hexamethyltetramine, 2 to 4 portions of N, N'-methylenebisacrylamide, 0.01 to 0.03 portion of ammonium persulfate, 3 to 6 portions of methacryloyloxyethyl trimethyl ammonium chloride, 1 to 3 portions of hydroxypropyl methyl cellulose, and 6 to 15 portions of diethylenetriamine. The invention also discloses the preparation method and a field use method for the selective water-plugging agent. The selective water-plugging agent can produce larger resistance to the flow of stratum water, ensure that the water phase permeability is greatly reduced, has small influence on the flow of crude oil, has the effect of plugging water and not plugging oil, can obviously improve the development efficiency of high water-cut oil wells, and improve the yield of the crude oil and the recovery ratio of oil pools.

The invention provides a gasbag-type explosion suppression and isolation device and method. The gasbag-type explosion suppression and isolation device and method are applicable to explosion suppression and isolation of gas explosion in a sealed pipeline free of other decompression spaces, and are particularly applicable to explosion suppression and isolation of gas explosion of delivery pipelinesof explosive gases like gas and of coal mine shafts. Firstly, folded gasbags and folded gas generators are installed in pipelines or a roadway, and detectors are installed at the proper positions of the pipelines of the two sides of an explosion suppression and isolation unit. A power source, a control unit and a signal processing system are arranged between the explosion suppression and isolationunit and the detectors in sequence. After explosion feature signals are received by the detectors and judged by a signal processing unit, the power source is started and excites an ignition electrodeto make a gas generator exploded and generate a large amount of inert gas, the inert gas is inflated into the gasbags from diversion pipes and damages a gasbag protection box, the gasbags filled withthe inert gas are instantaneously formed in the pipelines, and propagation of gas explosive shock waves and flame waves is inhibited. By means of the gasbag-type explosion suppression and isolation device and method, the problems in the prior art that only the flame waves can be inhibited and the inhibiting effect is not ideal can be solved.

The invention brings forward a composite multi-closed-chamber thick-walled box beam and an integral moulding method. The box beam comprises a multi-closed-chamber box framework and an external skin. The multi-closed-chamber box framework adopts a fiber reinforced material / prepreg resin system, and the external skin adopts a fiber reinforced material fabric / liquid molding resin system. The multi-closed-chamber box framework and the external skin are integrally formed. A layer of fibrofelt reinforced resin film is also included between the multi-closed-chamber box framework and the external skin. The fibrofelt reinforced resin film has a consistent resin system with the external skin. By inserting a layer of the fibrofelt reinforced resin film with lower surface density between the internal framework and the external skin, the resin film has good compatibility with the prepreg resin system and the liquid molding resin system in the curing mechanism. In addition, the influence on flow of the liquid molding resin is little, interface connection quality between the internal framework and the external skin is improved, and internal quality and integrity of the product are improved.

The invention discloses an electronic device which comprises a first shell, a heat dissipation assembly and a heating device. The first shell is provided with a first air inlet and a first air outlet.The heat dissipation assembly is detachably installed in the first shell. The heat dissipation assembly comprises a second shell and a gas driving device, the second shell is provided with an inner cavity, the gas driving device is arranged in the inner cavity, the second shell is provided with a second air inlet and a second air outlet, and the second air inlet and the second air outlet are connected with the inner cavity; the heating device is arranged in the first shell, and the heating device is in heat conduction connection with an outer side surface of the second shell; and the first air inlet is connected with the second air inlet, and the first air outlet is connected with the second air outlet. According to the scheme, a problem that the electronic device cannot rapidly dissipateheat in a background art can be solved.

The invention relates to a novel process structure and a method for short-circuit resistance electrodynamic force of transformer winding, in particular to a wire cake binding process method and several binding structures applied to winding manufacturing in the field of transformers. According to the novel structure and the technological method, the percent of pass of the sudden short circuit testof the transformer can reach 100% theoretically, that is to say, under the condition that the pressing nail or the pulling screw of the transformer is out of action, it can be guaranteed that a winding is not damaged. The structure and the method are simple, the effect is outstanding, and the electrical performance and the temperature rise of the transformer are not influenced.

The invention discloses a magnesium alloy thin plate strip blank extruding die which comprises a die body, wherein the die body is internally provided with a material storage cavity and an extruding channel communicated with the material storage cavity, the cross section of the extruding channel is rectangular, the two walls of the extruding channel in the thickness direction and two intersection lines of the material storage cavity are mutually staggered along the extruding direction, when the die is in use, extrusion on the upper part of magnesium alloy entering into the extruding channel is inconsistent with the extrusion on the lower part of the magnesium alloy, speed difference is formed, and a shearing force is produced, thus a basal plane is inclined and the texture of the basal plane is weakened, the follow-up processing of a plate strip blank can be convenient, and the stamping property of a plate can be improved. Besides, smooth transition is formed between the material storage cavity and the extruding channel, no dead angle or raw material retention is formed, raw materials can pass smoothly, and cleaning is easy; and meanwhile, the raw materials smoothly enter into the extruding channel by virtue of a transitional channel, and the influence on the flow of the raw materials is less.

The invention discloses a liquid lead bismuth alloy-inert gas two-phase flow void fraction measuring device and method based on differential pressure method. The liquid lead bismuth alloy-inert gas two-phase flow void fraction measuring device comprises a loop formed by sequentially communicating a gas-liquid two-phase flow ascending section, a horizontal gas-liquid separation section, a single-phase liquid descending section and a single-phase liquid horizontal section; the gas-liquid two-phase flow ascending section is provided with a gas injection port, the gas-liquid two-phase flow ascending section is divided into a plurality of measuring sections, and the pressure difference of each section is measured through a differential pressure gauge; the single-phase liquid descending sectionis provided with an electromagnetic flowmeter; a gas discharge valve is arranged at the upper part of the horizontal gas-liquid separation section; compressed inert gas is stored in a high-pressure gas storage tank, a gas pressure reducing valve at the top of the high-pressure gas storage tank is controlled to adjust the flow of gas injected through a gas injection port, and a gas flowmeter is used for recording the flow amount of the inert gas; the average void fraction of the gas-liquid two-phase flow ascending section is obtained by measuring the pressure difference of the gas-liquid two-phase flow ascending section and then calculating. The liquid lead bismuth alloy-inert gas two-phase flow void fraction measuring device has the advantages of small disturbance on flow amount measurement, high measurement precision, simple overall structure, easy processing and low cost.

The invention discloses an automatic ester-water separator for n-butyl acetate production, which comprises a bottom plate, two groups of supporting plates are fixed on both sides of the top end of the bottom plate, an ester-water separator main body is fixed on the top ends of the supporting plates, a cooling jacket is fixed on the outer peripheral surface of the ester-water separator main body, and the cooling jacket is fixed on the top end of the bottom plate. A plurality of groups of main flow dividing pipes are mounted at the top end of the ester-water separator main body, the main flow dividing pipes are distributed at equal intervals in the horizontal direction of the cooling sleeve, ester phase pipe straight pipes are mounted at the top ends of the main flow dividing pipes, first bent pipes are mounted at the two ends of each ester phase pipe straight pipe, and the bottom ends of the first bent pipes extend into the ester-water separator main body. According to the invention, the flowing influence of the mixed liquid is reduced, the separator is maintained at a relatively low temperature, the influence of the temperature on ester and water is reduced, the ester-water separation quality of the separator is improved, the separator carries out ester-water separation in a full-load state, and the separation efficiency of the separator is improved.

The invention discloses a conductor having a built-in stranded inner core and capable of reducing AC resistance. The conductor comprises an inner conductor, wherein the inner conductor enables itself to have positive charges after being electrified by positive DC electricity, the inner conductor comprises multiple inner cores and a filling material, the multiple inner cores are stranded into a bundle, an outer surface of the stranded multiple-core bundle is externally wrapped in an inner insulation layer, the filling material is filled between the stranded multiple-core bundle and the inner insulation layer, an outer surface of the inner insulation layer is wrapped in an outer conductor used for transmitting AC electricity, the inner conductor, the inner insulation layer and the outer conductor are coaxially arranged, the inner cores, the filling material and the outer conductor are prepared by an excellent conductor material, and the inner insulation layer is prepared by an insulation material. During AC transmission, free conductive electrons flowing in the outer conductor are uniformly distributed generally, so AC resistance of the outer surface of the outer conductor is reduced, electric energy loss is reduced, the outer conductor fully performs the conductor effect, and the conductive performance and the utilization rate of the conductor are greatly improved.

The invention discloses a conductor capable of reducing AC resistance and a positive charge quantity real-time regulating system provided for the conductor in a matched mode. The conductor comprises an inner core, wherein positive DC is connected into the inner core so that the inner core can have positive charges. The outer surface of the inner core is wrapped by an inner insulation layer, the outer surface of the inner insulation layer is wrapped by an outer layer conductor, the inner core, the inner insulation layer and the outer layer conductor are concentric, the inner core and the outer layer conductor are made of good conductor materials, and the inner insulation layer for preventing the positive charges in the inner core from entering the outer layer conductor is made of insulating materials. The positive charge quantity real-time regulating system can regulate and control the positive charge quantity in the inner core in real time, so that in the AC power transmission process of the conductor, free conduction electrons flowing in the outer layer conductor tend to be distributed evenly so as to reduce the outer layer AC resistance on the outer layer conductor, electric energy loss brought by the AC resistance can be lowered, the outer layer conductor can fully play the role of the conductor, and thus the conductivity and the utilization rate of the conductor in the power transmission process can be greatly improved.

The invention relates to a method for regulating roadbed heat convection in spring warping manner. The method includes steps of firstly, fixing an axis rod on the pipe wall of a ventilating pipe, and sheathing a rotary shaft sleeve pipe on the axis rod; then fixing an air door on the rotary shaft sleeve pipe; secondly, arranging a spacer on the axis rod, and arranging a memory alloy in the center of the axis rod; finally, fixing a gravity balance block on the air door through a chain rod. The method has the advantages of simple structure, convenience in installation, high stability and wide using scale; the method can completely adapt to the extreme severe environment of the Tibet Plateau, meet the special requirements of project construction, and improve the cooling performance of the ventilating roadbed to the most extent.

The invention provides high-temperature denitration and dust removal integration equipment. The high-temperature denitration and dust removal integration equipment comprises a body and an ash bucket,wherein the body is of a V-shaped plate-type structure; the body is arranged in a flue or a reactor and is used for carrying out out denitration and dust removal on flowing-through flue gas; and the ash bucket is arranged outside the flue or the reactor, is located under the body and is used for collecting dust removed by the body. According to the high-temperature denitration and dust removal integration equipment provided by the embodiment of the invention, the V-shaped plate-type body is arranged in the flue or the reactor to remove the dust in the flue or the reactor and is used for cooperatively removing nitrogen oxide; the ash bucket for collecting the dust is arranged under the body; the high-temperature denitration and dust removal integration equipment has small pressure loss andsmall influences on the flowing of the flue gas, and can be used for effectively removing the nitrogen oxide in fly ash and the flue gas at high temperature, so that the abrasion to a catalyst and theblocking to subsequent equipment, which are caused by the fly ash in an SCR (Selective Catalytic Reduction) system can be effectively reduced and the total denitration efficiency of an SCR denitration system is improved.

The invention discloses a rectangular-cross-section conductor internally provided with multiple inner cores and capable of reducing AC resistance. The conductor includes an external conductor which is used for transmitting AC and has a rectangular cross section. In the external conductor, the plurality of inner cores are arranged in parallel uniformly in an embedded manner and used for allowing positive AC to pass so as to be electrified with positive charge. The outer surface of each inner core is wrapped with a layer of internal insulating layer. The inner cores and the external conductor are made of a good conductor material. The internal insulating layers which prevent positive charge in the inner cores from entering the external conductor are made of an insulating material. During AC power transmission, the conductor is capable of enabling free conductive electrons flowing in the external conductor to tend to be distributed uniformly so as to reduce the AC resistance on an outer surface layer of the external conductor and reduce electric energy consumption brought to the conductor because of the AC resistance so that the external conductor is enabled to play fully a conductor role and thus the utilization rate of the conductive performance of the conductor in electric power transmission is improved significantly.

The invention relates to a floor drain capable of conveniently filtering hair. The floor drain comprises a casing, a seepage cover and a floor drain core, wherein the floor drain core is detachably arranged in a casing drainage channel; the floor drain core comprises a cylindrical main frame and an openable and closable bottom support; the main frame comprises a liquid collection opening and a drainage opening; the liquid collection opening faces the seepage cover; the bottom support is arranged on the drainage opening; a plurality of hook teeth used for filtering hair are formed in the surface, which faces a liquid coming direction, of the bottom support. Since the plurality of hook teeth are arranged on the surface, which faces the liquid coming direction, of the bottom support, the hookteeth face the liquid coming direction, hair mixed in the discharged liquid is intercepted by the hook teeth, and the hair is wound among the hook teeth. Then, the liquid discharge direction is positioned on the peripheral edge of the bottom support, and the influence of the intercepted hair on flow of the discharged water is very small. Therefore, the floor drain disclosed by the invention has the advantages that the hair in the discharged water can be effectively filtered, the condition that blockage is caused because the intercepted hair blocks outflow of the discharged water is avoided, and the beneficial effect of fast water drainage can be achieved.

The invention belongs to the field of fans, and particularly discloses an axial flow impeller with splitter blades. The splitter blades are installed between axial flow blades of the axial flow impeller, and blade roots of the splitter blades are connected with a hub of an axial flow fan. The splitter blades are similar to the axial flow blades in shape, the height of the splitter blades is obtained by multiplying the height of the axial flow blades by a height coefficient sigma, and the section of the splitter blades is obtained by multiplying the section of the axial flow blades at the same height by a reduction coefficient tau, wherein the height coefficient sigma ranges from 0.1 to 0.6, and the reduction coefficient tau ranges from 0.3 to 0.7. According to the axial flow impeller, through the improved design of given key parameters, the axial speed near the blade roots can be effectively increased, the area of a tail edge low-speed region is reduced, tail edge separation is weakened, low-energy fluid near an end wall is taken away, the development of passage vortexes and corner separation vortexes is restrained, and therefore the aerodynamic performance of the axial flow fan is improved.

The invention discloses a waste heat coil of a heating furnace. A water outlet and a water inlet are formed in the two ends of the waste heat coil. A plurality of vertical bent pipes are arranged in the middle section of the waste heat coil. The bent pipes are parallel to one another. A feeding notch is formed between every two adjacent bent pipes. The length of a top connection section between every two adjacent bent pipes is smaller than that of a bottom connection section. According to the waste heat coil of the heating furnace, by the adoption of the vertical bent pipe structure, the waste heat of smoke is sufficiently utilized, and influences on smoke ventilation are small; in addition, the appearance is attractive, and the waste heat coil can be combined with a flue conveniently; by the adoption of the structure, the length of the waste heat coil is effectively increased, so that heat in the smoke is sufficiently absorbed by the waste heat coil, and the temperature of hot water in the waste heat coil is also increased rapidly.

The invention provides a nickel-iron-phosphorus amorphous alloy composite fiber. The length of the composite fiber can be continuous, the cross section of the composite fiber can be circular, special-shaped and the like, the external diameter of the composite fiber is 0.01-0.2 millimeter, and the diameter of core yarn of the composite fiber is 0.005-0.08 millimeter; a coating layer of the composite fiber is nickel-iron-phosphorus amorphous alloy, the nickel-iron-phosphorus amorphous alloy is prepared from 40-85% of nickel, 10-20% of ferrum and 6-20% of phosphorus, and the core yarn of the composite fiber is made from a polymer. A preparation method of the composite fiber comprises the steps that (1) a polymer fiber is degreased; (2) the fiber surface is coarsened; (3) the fiber is sensitized; (4) the fiber surface is activated; (5) chemical nickel-iron-phosphorus plating is carried out on the fiber; (6) the nickel-iron-phosphorus amorphous alloy is plated on a fiber electric brush.

The invention discloses an eccentric butterfly valve, which comprises a valve body 1. An eccentric butterfly plate 2 with a spherical sealing surface and a valve seat 10 with a corresponding spherical sealing surface are arranged in the valve body 1; the eccentric butterfly plate 2 is arranged on a valve rod 5 through a connecting rod 9; the back of the eccentric butterfly plate 2 is provided with an eccentric adjusting block 3; the eccentric adjusting block 3 is connected with an arc connecting rod 4 through an eccentric adjusting block moving shaft pin 8; and the arc connecting rod 4 is fixedly arranged on the valve rod 5 through a positioning pin 6. The friction between the sealing surfaces is reduced, the purpose of opening and closing a valve through a small valve rod torque is fulfilled and the driving device is simplified by using a medium pressure as a main acting force for sealing the valve and adjusting the contact of the sealing surfaces by adopting the valve plate of a large eccentric connecting rod structure and a triangular eccentric adjusting block.

The invention provides a perfusion system for in-vitro extracellular electroneurophysiological research, belonging to the technical field of apparatus for in-vitro extracellular electroneurophysiological research. The perfusion system provided by the invention overcomes the technical problem of too great errors during quantitative analysis of transmembrane movement of ions confined in and located out of a cell wall in virtue of a perfusion tank. According to a technical scheme in the invention, a perfusate is stored in a perfusate storage device and is communicated with the perfusion system via a perfusate inlet pipe; a peristaltic pump is arranged between the perfusate storage device and the perfusion system; after the perfusate passes through the perfusion system, the perfusate becomes a waste perfusate which is communicated with a waste perfusate collecting device via a waste perfusate discharge pipe; the waste perfusate discharge pipe is provided with a waste-perfusate-discharge control pump; the perfusion system comprises a mounting rack and a perfusion device; and the perfusion device is mounted on the mounting rack. The perfusion system provided by the invention enables the perfusate to enter from the bottom of a perfusion tank, and the flow rate of the perfusate is reduced after obstruction by a screen mesh, so an ion flow rate during efflux of an in-vitro sample is reduced due to influence by flowing of the perfusate; and thus, the quantitative analysis of the transmembrane movement of ions confined in and located out of the cell wall is improved in precision.

The invention discloses an integrated two-stage heating efficient energy-saving heat pipe steam generator. The integrated two-stage heating efficient energy-saving heat pipe steam generator comprisesa flue gas pipe, wherein a gas inlet connecting pipe and a gas outlet connecting pipe are installed at the upper end and the lower end of the flue gas pipe correspondingly, a steam tank is installed on the outer side wall of the flue gas pipe in a surrounding manner, and a water inlet pipe is installed at the lower end of the steam tank; and a first-stage exhaust pipe and a safety pipe are installed above the steam tank, a safety valve is installed on the safety pipe, a partition plate is installed in the steam tank, and a steam cavity and a water storage cavity are formed in the upper layer and the lower layer of the partition plate correspondingly. The integrated two-stage heating efficient energy-saving heat pipe steam generator is ingenious in structure, the heat transfer efficiency isimproved and the utilization rate of high-temperature flue gas waste heat is increased through spiral heat pipes and a two-stage heating heat pipe, the waste heat utilization rate of low-temperatureflue gas is increased through graded heating of multiple steam tanks, water is pumped into the device through a pneumatic liquid pump by means of flue gas kinetic energy, and the equipment energy consumption is reduced.

The invention discloses a method and system for eliminating the impact and rub failure of low-pressure shaft seals of a turbine. The method comprises the step that in the starting process of the turbine, a cooling system of the turbine is started, so that cooling is conducted on steam exhaust cones of a low-pressure cylinder of the turbine. The temperatures of the steam exhaust cones are lowered,the temperatures of the low-pressure shaft seals arranged on the steam exhaust cones are lowered, and thus, deformation of the low-pressure shaft seals is reduced; inclination of the low-pressure shaft seals is restrained; and the reduction amount of a gap in the bottom of each low-pressure shaft seal is reduced, and thus, the problem that in the starting process of the turbine, the impact and rubfailure occurs due to temperature variation of the shaft seals is avoided. The method is simple and easy to implement; the improvement measures are obvious in effect; and after improvement, the flowinfluence of steam inside the turbine is extremely small.

The invention discloses a method using a non-extension type miniature sound detectors to perform flow measurement and belongs to the field of hydrodynamics. The method is characterized in that the miniature sound detectors are arranged inside a to-be-measured fan; by one sound detector A, a phase-determined sound signal is transmitted to one flow vortex K of a flow boundary layer and is reflectedto obtain the Doppler frequency shift speed components of the A and the vortex K in the direction i; in the similar way, by another sound detector B, the Doppler frequency shift speed component of thevortex k in the direction j is obtained; the different speed components are overlapped to obtain the speed and direction of the vortex K; the detectors transmit the pulse sound wave signals at constant time intervals to obtain the Doppler frequency shift components of multiple vortexes in corresponding directions; the sound detectors are arranged in a linear or planar vertical manner to measure flow planar speed fields and three-dimensional speed fields inside the flow boundary layer. The method is fast in instantaneous response, small in error, low in resource consumption and worthy of popularization.

The invention discloses a bionic forestry environment monitoring device which comprises a smoking device and a monitor, the bottom of the smoking device is a suction cavity, a sealing cover is inserted into the suction cavity, reinforcing blocks are installed on the two sides of the top of the sealing cover through installation screws in a threaded mode, and one side of each reinforcing block is fixedly connected with a side block; and rotary connecting plates are fixedly connected to the two sides of the smoke suction device correspondingly, screw grooves are formed in one sides of the rotaryconnecting plates, screw rods are in threaded connection with the interiors of the screw grooves, the ends, away from the screw grooves, of the screw rods penetrate through the side blocks, and a driving motor is inlaid in the inner top wall of the suction cavity. According to the bionic forestry environment monitoring equipment, kinetic energy of flue gas flowing in the secondary heating heat pipe is converted into rotating mechanical energy of the pneumatic liquid pump, rotating airflow is generated through rotation of blades of the pneumatic liquid pump, and therefore the flue gas in the suction cavity is conveyed into the monitor through the smoke exhaust pipe, the flue gas kinetic energy is effectively utilized, and electric energy consumption is reduced; and the environmental awareness is improved.

The invention discloses an intelligent adjusting method for air convection in an induction furnace during online-moving heating of a steel plate. Firstly, the steel plate enters the heating induction furnace through a furnace front roller bed and is heated in the induction furnace, and an air flow detecting device of an air flow detecting and adjusting system mounted on the inner surface of an upper inductor is used for detecting air flowing in the induction furnace in real time and sending detection data to an intelligent processing unit; secondly, the intelligent processing unit is used for working out the air flowing direction and strength in the induction furnace according to the detection data and working out the air flow rate and the acting direction needed for counteracting air flowing, and worked-out results are sent to a PLC control system; thirdly, the PLC control system gives out adjusting commands to an air blowing device of the air flow detecting and adjusting system, and the adjusting commands include the air flow rate command and the air flow direction command; and fourthly, the air blowing device carries out real-time air-blowing adjustment, so that air convection in the furnace is lowered to an allowed range.

The invention discloses an axial temperature and pressure continuous measuring device for fluid in a pipe. The axial temperature and pressure continuous measuring device is composed of a power supply, a micro control unit, an upper computer, a driving acquisition module and a measuring section. Compared with the prior art, the axial temperature and pressure continuous measuring device has the advantages that a mobile measuring unit is completely sealed in a measuring channel, so that leakage does not exist; by the adoption of a mobile measuring method, the flowing condition of the fluid in a stable state can be measured without arranging multiple measuring points in the measuring channel, so that the measuring structure is simplified, and the influence on flowing of the fluid is small; technologies related to all the units are already mature, the measuring technology is reliable, a measured result is approximate to the true flowing state of the internal fluid, and the accuracy is high; the cost for operation and maintenance is low.

The invention relates to a blade energy-dissipating stable liquid-level adjustable water tank for pipeline transient flow, comprising a circulating water tank, an overflow water tank and a water collection pipe, the top of the circulating water tank is connected to the bottom of the overflow water tank; The overflow water tank includes an outer box and an inner box arranged in the outer box, the lower end of the outer box and the lower end of the inner box are closed by a bottom surface, and the inner box The lower end is docked with the upper end of the circulating water tank, and the upper end of the inner box is lower than the upper end of the outer box; the water collecting pipe is arranged below the bottom of the overflow water tank, and the water collecting pipe wraps around the The circulating water tank is arranged circumferentially and forms a loop. The water collecting pipe communicates with the bottom surface between the outer box and the inner box through several connecting pipes; an overflow pipe is connected to the water collecting pipe. The invention can overflow at a high liquid level with stable liquid level and little disturbance.

The invention discloses an air intake silencer. The air intake silencer comprises at least one annular silencing unit which is sequentially arranged in the axial direction of an air intake pipe; each silencing unit comprises an annular outer shell, a first baffle, a second baffle and a through hole formed in the wall of the air intake pipe of an engine; the surface of the air intake pipe of the engine is sleeved with the annular outer shell, the first baffle and the second baffle are installed between the annular outer shell and the air intake pipe in the radial direction, and a cavity is jointly formed by the two baffles and the annular outer shell; and the cavity is communicated with the air intake pipe of the engine through a through hole. According to the air intake silencer, the multiple silencing units are designed to be circumferentially distributed around the air intake pipe, the silencing frequency of the silencing units can be flexibly adjusted, and the target noise peak value can be eliminated; and in addition, the structure is compact, the size of the air intake silencer of the engine is reduced, and compact arrangement of all components in an engine compartment is easily achieved.

The invention discloses a conductor with built-in multi-twisted inner cores which can reduce AC resistance. It includes an inner conductor which is fed with a positive direct current to make itself positively charged. The inner conductor includes a plurality of inner cores and fillers. The inner cores are mutually twisted into a bundle, and the outer surface of the bundled multiple inner cores is covered with an inner insulating layer, and the filler is filled between the bundled multiple inner cores and the inner insulating layer, and the inner insulating layer The outer surface is covered with an outer conductor for transmitting alternating current, the inner conductor, the inner insulating layer, and the outer conductor are concentric, wherein: the inner core, the filler, and the outer conductor are made of good conductor materials, and the inner insulating layer Made of insulating material. In AC power transmission, the present invention makes the free conductive electrons flowing in the outer conductor tend to be evenly distributed, reduces the AC resistance of the outer layer on the outer conductor, reduces power loss, and makes the outer conductor fully play the role of conductor, greatly improving the performance of the present invention. electrical conductivity and utilization.

The invention relates to the technical field of oyster culture, in particular to an offshore original ecological oyster culture method. The offshore original ecological oyster culture method comprisesthe following steps: selecting different water areas for culture at different stages of oysters, performing piling at certain intervals in a culture area, arranging pile connecting lines in a longitudinal and transverse straight line manner, and fixing transverse strips on piles, so that the piles are mutually fixed, wherein the height of the transverse strips is 1m or above greater than the seasurface in a big tide, wood strips or bamboo poles are fixed on the transverse strips in parallel to form a rectangular fixed bent frame, an oyster attachment base is hung on the transverse strips andthe oyster attachment bas is positioned between a high tide line and a low tide line, so that oyster strings are in a submerged state in a rising tide and are in a dry and exposed state in a fallingtide; and the oysters are in a primary state similar to an intertidal zone. According to the offshore original ecological oyster culture method, the survival rate of oyster breeding is increased, andthe oyster breeding space is expanded.

The invention provides a system and method for measuring the velocity of a high temperature melt. The system comprises a power supply, a switch, an adjustable resistor, a signal load, a detection metal wire, a high frequency data acquisition system, a PC terminal and a signal transmission cable. The number of signal branches is determined by a number of spatial location points with the need of the measurement of the velocity of the high temperature molt, and the resistance of the adjustable resistor is adjusted according to the branch number so as to ensure that the voltage of a load resistor in each branch is in a scope of recognition and acquisition. Through synchronizing the high frequency data acquisition system, a voltage signal of the signal load is collected and processed and is transmitted to the PC terminal to be displayed and recorded. Based on the high temperature melt, the detection metal wire can be melted, and thus the voltage signal of the signal load changes suddenly. According to a mutation time interval and a detection metal wire space distance, the velocity of a high temperature melt is measured. According to the system and the method, the interference and influence of the high temperature melt flow are small in a measurement process, and the velocity of the high temperature melt can be measured effectively.