58results about How to "Change flow velocity" patented technology

The invention relates to a heat-radiating structure of a frequency converter, which comprises an upper shell (1), a lower shell (2), a heat-radiating air flue (3) in the lower shell (2), and a fan set (4). The heat-radiating structure of the frequency converter is characterized by further comprising an air flue inner plate (5) and at least one air flue bent plate (8); the air flue inner plate (5) is fixed on the lower shell (2) and defines the heat-radiating air flue (3) together with the lower shell (2); a heat radiator (7) is clamped on the air flue inner plate (5); the air flue bent plate (8) is a bent plate which is bent on two sides and is convex in middle; and the air flue bent plate is fixed on the bottom surface of the lower shell (2) or is fixed on the front side and the back side of the lower shell (2), and guarantees that the air flue bent plate (8) and the heat radiator correspond to each other, so as to decrease the cross sectional area of the heat-radiating air flue (3) at the heat radiator (7). By using the heat-radiating structure of the frequency converter, the cross sectional area of the heat-radiating air flue at the heat radiator is effectively changed; the air flow speed in the air flue is improved; the heat-radiating effect is improved; therefore, the volume of the heat radiator further can be decreased; the weight is decreased; and the cost is saved.

The invention discloses an aluminum alloy chemical polishing agent applicable to automatic production. The chemical polishing agent comprises aqueous solutions of the following substances: according to mass-volume concentration, 790g/L to 880g/L of phosphoric acids, 100g/L to 250g/L of sulfuric acids, 10g/L to 50g/L of aluminum ions and 2g/L to 10g/L of coupling agents. According to the chemical polishing agent, the proportion of the phosphoric acids and the sulfuric acids is adjusted, and aluminum ions are further added, so that the corrosion of the polishing agent is reduced. The viscosity of the polishing agent is added by the adding of the coupling agents, so that the flow speed of gas released in the polishing process is changed, and the gas cannot leave gas marks on workpieces after the polishing; besides, as the coupling agents can be attached onto the workpiece surface, a layer of protection film is formed between highly corrosive acids and alloy surfaces, so that excessive corrosion caused by the continuous reaction of workpieces after the workpieces leave polishing grooves (during the slow transfer of the automatic production) is avoided, and further, the production stability is guaranteed, and requirements of automatic production is met.

The invention discloses a gas-liquid static mixer and a gas-liquid static mixing system. The gas-liquid static mixer comprises a mixer main body with a liquid inlet (4), a gas inlet (5) and an outlet(6); a gas-liquid mixing area (1) with a liquid inlet (4) and a gas inlet (5) is arranged in the mixer main body; the gas-liquid mixing area comprises a contraction section (11), a throat pipe section(12) and an expansion section (13) which are sequentially connected in the flowing direction of fluid, the contraction section (11) gradually contracts in the direction towards the throat pipe section, and the expansion section (13) gradually expands in the direction close to an outlet from the throat pipe section; a static mixing area (3) is arranged between the expansion section (13) and the outlet (6), and a twisting piece (31) spirally extending in the axial direction is arranged in the static mixing area. The static mixer and the gas-liquid static mixing system provided by the inventionhave good gas-liquid dispersion, mixing and mass transfer effects, and are low in manufacturing cost, compact in structure, simple to operate and low in maintenance cost.

The invention relates to a laser-electric arc two-heat source weak coupling welding method for high-nitrogen steel. Firstly, energy density of laser beams is reduced by means of an optical regulationand control technology; then, the energy density of a composite heat source is reduced by means of two-heat source weak coupling effect; and more importantly, the weak coupling effect is capable of changing the flowing speed and direction of a molten pool and reducing the peak temperature of the molten pool, so that nitrogen precipitation of base metal is reduced, reabsorption of molten pool liquid metal on precipitated nitrogen is improved, discharge of redundant nitrogen is accelerated, and pore-free welding seams are formed finally. The comprehensive mechanical property of splice is improved, and the problems that the welding pores of the high-nitrogen steel are difficult to inhibit and the consistency of the performance of the splice is poor in the prior art are solved. The method hasthe advantages of high welding speed and good welding seam quality and the production efficiency and product quality are improved; and the problems of multiple welding seam pores, poor comprehensive performance and complex welding process in the related art are solved, the product quality is improved, the production cost is reduced, the welding process is simple, and high automation degree is achieved.

The invention discloses a pulverized coal pre-pyrolyzation decoupling combustion device comprising a pyrolysis chamber, a cyclone separator, an ejector device and a particle burning device; the pyrolysis chamber is provided with a raw material inlet and a product outlet; the cyclone separator is provided with a product inlet, a volatile component outlet and a particle outlet; the product inlet ofthe cyclone separator communicates with the product outlet of the pyrolysis chamber through a pyrolysis product transport passage; a reburning fuel pipe is arranged at the volatile component outlet ofthe cyclone separator; a discharging pipe is arranged at the particle outlet of the cyclone separator; the reburning fuel pipe is used for being led into a hearth; the discharging pipe communicates with a particle combustion device through the ejector device; ejector gas flow is led into the ejector device; a particle combustion device comprises an air duct; and the air duct is led into the hearth. The pulverized coal pre-pyrolyzation decoupling combustion device is based on the decoupling idea, is suitable for pulverized coal decoupling combustion, can achieve the higher pulverized coal combustion rate, is relatively good in combustion stability, and can effectively suppress NOx generation.

The invention provides a heat exchanger with high heat exchanging efficiency, small resistance, difficult scale formation and small vibration, comprising an external tube with a water inlet and outlet and a plurality of spiral heat exchange tubes in the external tube; wherein the two ends of the external tube are respectively connected with a tube plate hermetically; the two ends of the heat exchange tubes are hermetically connected to the tube plate; the external tube and the spiral heat exchange tubes are straight tubes; the walls of the heat exchange tubes are provided with three spiral lines uniformly distributed on a same section; and the spiral lines between adjacent heat exchange tubes are contacted.

The invention discloses a device and a method for testing the corrosion of a grounding material in a soil simulated solution. The device comprises a soil simulated solution tank (1), a temperature control system, a gas control system, a three-electrode system and a liquid transmission system, wherein the temperature control system comprises a heating-temperature control integral machine (9) and atemperature sensing module (8); the gas control system comprises a gas switch (10), a gas guide tube (11), an intelligent gas sensor (12), an oxygen content analysis module (6), a gas switch valve (13) and an oxygen bottle (14); the liquid transmission system comprises an intelligent water pump (7), a soil simulated solution control valve (15), a liquid diverter (16), an intelligent control valve,a combiner box (26) and a liquid control switch (27); the three-electrode system comprises three three-electrode testing areas; each three-electrode testing area comprises a three-electrode intelligent rotating module (28), a grounding material working electrode (29), a reference electrode (30), an auxiliary electrode (31) and an intelligent rotating module motor (32).

The embodiment of the invention discloses a movable efficient environment-friendly grain impurity cleaning device. The movable efficient environment-friendly grain impurity cleaning device comprises adrum screen, a vibrating screen and a circulating winnowing system which are sequentially arranged from top to bottom; the drum screen comprises a screen drum, a rotating shaft is arranged in the screen drum, and an auger blade is arranged on the rotating shaft; the screen drum is in driving connection with a first rotating motor; the rotating shaft is in driving connection with a second rotatingmotor; and the circulating winnowing system comprises an air suction device, an air blowing device, a filtering device and a dust filtering device, a winnowing channel is arranged between the air suction device and the air blowing device, the air suction device and the air blowing device are connected through the filtering device, and the dust filtering device is connected with the air blowing device through a pressure reducing pipe. In this way, during use, the screen drum and the rotating shaft can rotate, so that the flowing speed of grains in the screen drum is changed, and the utilization rate of the screen surface is increased; and meanwhile, dust pollution of the equipment operation environment during use is avoided through the pressure reducing pipe and the dust filtering device.

The invention discloses a pipe fitting with the function of being capable of changing the diameter and the flow velocity. The pipe fitting is composed of an elbowed pipe fitting, a corrugated adjusting plate, a cushion block, a stainless steel sealing block, bolts and an insulated rubber gasket; through cooperation of the corrugated adjusting plate, the cushion block and the bolts, the diameter of the elbowed pipe fitting can be adjusted by changing the angle of the corrugated adjusting plate, the radian of corrugation on the adjusting plate is relatively changed along with changes of the angle of the corrugated adjusting plate, and then deformation of the elbowed portion of the pipe fitting is reduced. Accordingly, direct abrasion and deformation in the elbowed pipe fitting are reduced, the service life of the elbowed pipe fitting is prolonged, the diameter of the elbowed pipe fitting is changed, and the flow velocity in the pipe fitting is indirectly changed.

The invention discloses a heat exchange intelligent temperature control device. The heat exchange intelligent temperature control device comprises a box body, a liquid passing hole penetrating up anddown is formed in the box body, a water inlet is formed in the lower side of the liquid passing hole, a water outlet is formed in the upper side of the liquid passing hole, a heat exchange cavity is formed in the box body, and seven first heat conduction pieces are fixedly arranged between the inner wall of the left side of the heat exchange cavity and the inner wall of the right side of the liquid passing hole. According to the heat exchange intelligent temperature control device, the flowing speed of cold medium liquid is changed by utilizing the temperature change of hot medium liquid, so that the heat exchange efficiency between the cold medium liquid and the hot medium liquid is changed, and after a certain amount of cold medium liquid is subjected to temperature control heating, theheated liquid is automatically discharged and the cold medium liquid is supplemented again, so that continuity in the heat exchange process is achieved, the heat utilization rate of the hot medium liquid is increased, the automation degree is high, the heat exchange efficiency and the heat exchange effect are good, and intelligent and controllable utilization of energy is facilitated.

The invention discloses an efficient cement mixing device which comprises a mixing drum; a mixing shaft is arranged in the middle of the interior of the mixing drum; mixing blades are arranged on the mixing shaft; the mixing shaft is connected with a belt wheel through a chain belt; the belt wheel is fixed to a rotating shaft of a driving motor; a high pressure fan is arranged at the lower part of the left side of the mixing drum; and an air pipe is arranged on the right side of the high pressure fan, and is connected with the mixing drum in a communicating manner. A concrete mixed material is mixed through the mixing blades, and is filtered through flow filtration holes, so that the flow velocities of sandstone and cement can be changed; high pressure air is supplied to the bottom of the left side of the mixing drum through the high pressure fan, and the concrete material can be loosened through the high pressure fan when concrete is mixed, so that the mixing efficiency and the quality can be improved; by taking a relay as a control device, the direction of current flowing through a motor M is controlled so as to control positive and negative rotation of the motor M; a circuit structure is simple; and the efficient cement mixing device is low in cost, small in size and wide in application scope.

The invention provides a structure improvement method for a cooling water jacket of a motorized spindle. The flowing speed of cooling liquid flowing through a cooling system is changed, a flowing boundary layer is destroyed and the original stable flowing state of the cooling liquid is changed by changing the arrangement of an inlet and an outlet into the symmetrical direction and carving grooves in the bottom and the side wall of a spiral flow channel, so that the convective heat transfer coefficient is increased, and the purposes of enhancing the heat exchange effect and reducing the temperature rise of the spindle are achieved.

The invention discloses a plastic master batch screening and recycling device machine with a drying function. The plastic master batch screening and recycling device machine with the drying function comprises a drying machine body, wherein a box door lock is arranged on a box door of the drying machine body; a feed pipe is connected to the top of the drying machine body; a plurality of uniformly distributed heaters are fixedly connected to the inner wall of the drying machine body; long supporting rods are fixedly arranged at the two sides of the bottom face of the drying machine body; a firstmotor drives a crankshaft to rotate, at the moment, the crankshaft can drive a screening box to conduct up-down overturning motion, repeated overturning can fully screen master batches in the screening box, screening holes are smaller than the volume of the master batches of finished products, the qualified master batches can be collected into a material collecting box from a discharging nozzle of the screening box, the unqualified master batches leaked from the screening holes fall onto a conveyor belt, and the conveyor belt is used for collecting the unqualified master batches into a recycling box. According to the plastic master batch screening and recycling device machine, the whole screening and recycling process is an automatic machining process, and the machining efficiency is high.

The invention provides a construction method of a fingerprint spectrum of syzygium aromaticum and kaki calyx powder as well as a standard fingerprint spectrum and application thereof, and belongs to the technical field of drug detection.The construction method comprises the steps that a test solution and a reference solution are prepared firstly, then acetonitrile (A)-0.02 wt% phosphoric acid aqueous solution (B) is used as a mobile phase, and the standard fingerprint spectrum of the syzygium aromaticum and kaki calyx powder is constructed. Respectively carrying out high performance liquid chromatography detection on the test solution and the reference substance solution to obtain a fingerprint spectrum of the clove and persimmon calyx powder; the standard fingerprint spectrum of the clove and kaki calyx powder is obtained by using the construction method and is used for quality evaluation or control in the whole process of research/development/production/clinical application of the clove and kaki calyx powder. According to the construction method of the fingerprint spectrum of the clove and kaki calyx powder, all medicinal material components in the whole formula of the clove and kaki calyx powder can be detected together; the provided standard fingerprint spectrum can provide a scientific basis for comprehensively establishing a quality control standard of the clove and kaki calyx powder.

The invention discloses an intelligent heat recovery device and method for livestock breeding. The heat recovery device comprises a liquid storage box set, a water pump and a fan. The liquid storage box set comprises an upper liquid storage box and a lower liquid storage box, and multiple waste liquid through holes are formed in the bottom of the upper waste liquid box and the top of the lower waste liquid box. Multiple waste liquid channels and multiple air channels are arranged between the upper waste liquid box and the lower waste liquid box, and the multiple waste liquid channels and the multiple air channels are arranged at intervals. The multiple air channels are transversely arranged, and the exhaust ends of the air channels are connected into a breeding room through an air guide channel. Liquid flow velocity sensors are arranged on the waste liquid channels, and gas flow velocity sensors are arranged on the air channels. According to the intelligent heat recovery device and method for livestock breeding, heat of waste liquid discharged out of the breeding room can be fully utilized, heat recycling is achieved, the air temperature and flow velocity in the breeding room can be intelligently adjusted, livestock growth is facilitated, and the indoor environment is kept clean.

The invention relates to a spiral tube semi-solid slurry preparation integrated system, including a furnace assembly, a spiral tube slurry preparation assembly, and a slurry buffer assembly. The furnace assembly comprises a furnace body, a furnace cover, a slurry baffle and a driving cylinder. The spiral tube slurry preparation assembly comprises a spiral tube, a spiral tube guide rod, a furnace body support tube, a top plate, a bottom plate and a hydraulic cylinder. The slurry buffer assembly comprises a buffer tank, a buffer tank cover and a filter screen. The spiral tube semi-solid slurry preparation integrated system can continuously, efficiently and cleanly prepare semi-solid slurry under the condition of low energy consumption.

The invention relates to the technical field of power cabinets, in particular to a high-voltage power cabinet with a good heat dissipation effect. The cabinet comprises a cabinet body, a PLC is fixedon the upper side wall of the cabinet body, air inlet hoods are arranged above the two side walls of the cabinet body, and air exhaust hoods are arranged below the two side walls of the cabinet body;air can be conveniently fed through the arranged air inlet hoods when a draught fan rotates, the air inlet hoods are arranged on the side walls of the cabinet body, dust can be prevented from enteringthe cabinet body, and water drops can be prevented from entering the cabinet body from the air inlet hoods at the top of the cabinet body when moisture regaining occurs to the cabinet body. The arranged exhaust hoods can exhaust air flowing from the top out of the cabinet body, circulation of air in the cabinet body is ensured, an arranged heat dissipation mechanism can rapidly blow air into thecabinet body, and when the heat dissipation mechanism carries out exhausting, the air speed in the cabinet body can be changed, so the heat dissipation effect of the cabinet body is improved; therefore, the air flowing speed in the cabinet body can be changed, and the ventilation effect of the cabinet body is better.