210results about How to "Reduce head" patented technology

The invention relates to a safety injection system, which is used for mitigating an accident and protecting the safety of a reactor core of a nuclear power plant and comprises a high-pressure safety injection pump, a low-pressure safety injection pump, a safety injection tank and a refueling water tank for containing safety injection water, wherein the refueling water tank is positioned in a safety shell of the nuclear power plant; the safety injection tank is connected on a direct pressure vessel injection pipeline by a pipeline provided with a control valve; the high-pressure safety injection pump is connected between the refueling water tank and the direct pressure vessel injection pipeline by a pipeline provided with a control valve; and the low-pressure safety injection pump is connected between the refueling water tank and the direct pressure vessel injection pipeline by a pipeline provided with a control valve. The safety injection system has the advantages of reducing cross pipelines of the system, realizing continuous operation, simplifying the system operation, also strengthening mitigating capability of the system for the serious accident and improving safety of the nuclear power plant.

A centrifugal pump has impellers for pumping low flow, high viscous materials. The impellers have high exit angles greater than 30 degrees and preferably greater than 50 degrees. The impellers and diffusers have specific geometry that varies with viscosity. The pump has zones of impellers and diffusers with the exit angles and geometry in the zones differing from the other zones. The exit angles decrease and geometry varies in a downstream direction to account for a lower viscosity occurring due to heat being generated in the pump. One design employs small diameter impellers and high rotational speeds.

The invention discloses a vertical tube seawater spewing and boiling evaporator, and belongs to the technical fields of seawater desalination and heat exchangers. The evaporator has a tower structure; the lower end of a heat exchange box is fixedly connected with a lower tube box, and the lower end is fixedly connected with an upper tube box; and the lower tube box is communicated with the upper tube box through an evaporation tube bundle and a down pipe. When the evaporator works, seawater in the evaporation tube bundle is heated by a shell pass fluid to reach a spewing evaporation state, sothat the seawater and steam are naturally separated under the action of gravity, and the separated steam bypasses an anti-impact plate, passes through a wire mesh demister and is discharged through asecondary steam outlet. The evaporator is not provided with a seawater spraying facility or a film forming mechanism, the seawater enters the equipment from the lower part of the equipment, the feed pump head is reduced, the power consumption of the pump is reduced, and the evaporator has a simple structure and works reliably; a shell pass heating medium can be subjected to constant-temperature heat exchange through steam condensation and also can be subjected to temperature reducing heat exchange by a single-phase fluid; the seawater in the tube scours upwards at a high speed, and the seawater scaling property is reduced; and the evaporator has higher coefficient of heat transfer, and can be widely applied to a small seawater desalting device.

The invention belongs to the field of environmental protection equipment, which relates to an ammonia desulfurization technology and a device utilizing high potential energy. The device comprises a desulfurizing tower, a concentrated crystallizing pool, an oxidation communication device, a low-level circulation pump, a high-level circulation pump, a crystal pulp pump and a centrifugal drying system which are positioned outside the tower; the desulfurizing tower is divided into an upper layer section and a lower layer section, and a gas cap through which only flue gas can pass is arranged between the upper layer section and the lower layer section; the lower layer section of the desulfurizing tower and the oxidation communication device are both provided with an oxidation gas distributor and an oxidation gas deflector; and spray heads are 2 to 4 layers. Under the precondition that normal desulfurization efficiency is ensured, the invention not only saves the investment but also reducesthe running cost.

The invention relates to a coal gasification ash content treatment device and a method. The method comprises the steps of: under the condition of having no need of reducing pressure, enabling gasified black water to directly flow in an ash separator, filtering and separating ash from the gasified black water through the ash separator to obtain ash water with an ash content of below 100ppm, cooling and pumping the ash water to a gasified device for recycling. The coal gasification ash content treatment device and method have the advantages of replacing the recycling process of flash evaporation, sedimentation, vacuum filtering, pressurization and the like in the traditional gasified ash water treatment processes, and directly removing ash under the condition of not reducing the pressure of the black water. The process flow is simple, and the investment, occupied space and energy consumption can be greatly reduced.

The invention relates to a wet flue gas desulfurization (WFGD) process for gypsum through oxidization in a tower by using a calcium-based strongly basic substance, belonging to the technical field of WFGD. The invention is characterized in that oxidization automatic isolators and oxidization air tubes in the slurry pond of an absorption tower are alternately arranged at intervals to divide the whole slurry pond into an upper low pH value region and a lower high pH value region; the calcium-based strongly basic substance is used as an absorbent; the absorbent slurry is sprayed downwards from the top of the absorption tower to be in contact with flue gas for absorbing sulfur dioxide, and then, the absorbent slurry falls into the upper low pH value region of the slurry pond to be forcibly oxidized; a jet mixing system is adopted for preventing solid matters from depositing on the bottom of the absorption tower; and an upper slurry discharging port is used for discharging slurry and dehydrating gypsum to generate solid gypsum powder the water content of which is less than 10%. The invention has the advantages that ideal desulfurization efficiency can be achieved only by smaller liquid-gas ratio, absorption of sulfur dioxide and forced oxidization and crystallization of by-products are completed in the single absorption tower, the equipment investment is saved, the power consumption is lowered, and the operating cost is low.

The invention provides a novel combined soft water closed circulation cooling system for a blast furnace. Soft water pressurized by a main pump set passes through a furnace bottom water cooling pipe, a cooling wall coiled pipe, a cooling wall straight cooling pipe, a hot air valve booster pump set, a hot air valve, a small air opening sleeve booster pump set, a small air opening sleeve, a medium air opening sleeve, a straight blowing pipe and other cooling equipment, and a pressure pump set, which are combined through all pipelines or partial pipelines in series connection and parallel connection modes, is gathered, degassed by a degassing tank and subjected to pressure stabilization and leak detection by an expansion tank, returns to a soft water pump room, and is cooled by a heat exchanger, pressurized by the main pump set and supplied to the blast furnace for circulation, wherein in the cooling equipment, the medium air opening sleeve and the straight blowing pipe are connected in parallel; the small air opening sleeve is connected in series with the parallelly connected medium air opening sleeve and straight blowing pipe; and the hot air valve is connected in parallel with theserially and parallelly connected small air opening sleeve, medium air opening sleeve and straight blowing pipe. By the optimized parallel connection and serial connection combined mode, the novel combined soft water closed circulation cooling system has the advantages of less cooling water amount, a fewer system pipelines, valves and pump sets, and low total investment and operating cost.

A high-level water collecting device comprises a plurality of horizontal and parallel water collecting units in rows and upper-portion water-sprayed fillers. The device further comprises a horizontal and stabilizing portion comprising a horizontal stabilizing rod. The water collecting units comprise horizontal rods, water collecting tanks, water collecting plates, anti-splashing fillers and limiting plates. The water collecting tanks of the water collecting units are U-shaped grooves made of glass fiber reinforced plastic material, and the U-shaped grooves are arranged horizontally and parallelly in rows. A wet cooling tower comprises a supporting structure, tower core equipment and a water distribution system. The tower core equipment comprises regional valves, water distribution pipelines, spray nozzles, water-sprayed fillers, the high-level water collecting device and water removers. The high-level water collecting device comprises a plurality of horizontal and parallel water collecting units in rows and the upper-portion water-sprayed fillers. According to the high-level water collecting device and the wet cooling tower with the same, the water collecting effect is extremely good, circulating water loss is low, resource is utilized fully, power is saved, and equipment is mounted conveniently and can be operated safely and reliably in bed weathers.

The invention discloses a variable flow and household metering centralized heating system and a hydraulic balance regulating method. The system comprises household metering modules, a water supply temperature measuring module, a water returning temperature measuring module and a heat supply network monitoring and controlling management platform. The household metering modules are arranged at the positions of users, and the heat supply network monitoring and controlling management platform is in communication connection with the household metering modules and a total circulating pump and collects the water supply temperature and the water returning temperature in pipe network systems through the water supply temperature measuring module and the water returning temperature measuring module; and a frequency changer is arranged on the total circulating pump. The water quantity needs of the users are met, and on the premise that the heat comfort requirement of the users is met, the flow is adjusted according to needs, and energy consumption is reduced; and the cost is saved, the reliability and the stability are higher, and the system is more suitable for long-term utilization.

The invention discloses a low-energy-consumption and ultraclean-emission flue gas desulfurization method and device and belongs to the field of flue gas pollution treatment. According to the invention, desulfurization slurry is divided into two independent desulfurization spraying slurry circulating systems and a three-circulation desulfurization process of a double-slurry collection device (a slurry tank / box), double-slurry density and control of pH values of slurry of different regions is adopted so that the aims of lowering energy consumption and meeting the requirements of ultraclean or near-zero emission of PM and SO2 are realized. The double-slurry tank / box is arranged, the different slurry densities of the double-slurry tank / box is controlled, the pH values of the slurry in the different regions are controlled and the two independent slurry circulating systems are formed, so that the aims that the solid content of desulfurized pure flue gas liquid drops is lower than 10% and the system desulfurization efficiency is more than 99% are realized; and a slurry tank outside a tower is arranged at a high liquid level and fewer spraying layers are arranged so that the aims of lowering the power of a circulating pump and reducing the operation power consumption of the desulfurization are realized.

The invention relates to water-mixing regulating method and device of a secondary network system of a heat exchange unit, aiming to solve the cost problem of the traditional heat exchange unit. The water-mixing regulating method of the secondary network system of the heat exchange unit comprises the following steps of: realizing the heat exchange of two paths of liquid having temperature difference, wherein one path of liquid connected with a hot source or a cold source in series is called as a first network and the other path of liquid connected with the user terminal in series is called as a secondary network; connecting a passage in parallel between the input end and the output end of a plate-type heat exchanger on one path of the secondary network, accessing one part of the liquid of the secondary network to the plate-type heat exchanger for heat exchange, directly mixing the other part of the liquid with the output end of the plate-type heat exchanger via the parallel connected passage and then outputting the liquid. After the passages connected in parallel are increased in the secondary network system, the water flow entering the plate-type heat exchanger is reduced by 30 to 50% compared with the water flow before.

A flue gas decarbonization system of stepped absorption and regeneration belongs to the technical field of clean coal and comprises two parts of an absorption system and a regeneration system. The absorption system comprises a pregnant solution tank, an absorption tower, filling, a defogger and two barren liquor inlets; and the regeneration system comprises a regeneration tower, a barren liquor tank, two barren liquor accumulating tanks, a defogger, a solution boiler, a regeneration gas cooler, and the like. The flue gas decarbonization system adopts the new technology of two-stage absorption and stepped regeneration, can adapt to the absorption characteristic of absorbent, obviously optimizes the system, lowers the energy consumption and the electricity consumption of regeneration, and is suitable to the decarbonization of the coal-fired power plant and the chemical field.

An ink jet head includes a head body (11) which is provided with a plurality of nozzles and a plurality of pressure chambers and actuators (14) respectively corresponding to the nozzles. Input terminals (37) of the actuators (14) are arranged locally between left-side and right-side central actuator columns (14A, 14A). A driver IC (13) is mounted on the head body (11) by flip chip bonding.

The invention provides a swirling air flow-type and wet flue gas desulfurization technique and a spraying tower thereof. The technique guides flue gases to enter tangentially from the upper part of a spraying tower shell; the flue gases swirl inside the spraying tower shell and leave tangentially from the lower part of the spraying tower shell; at the same time, limestone grout is sprayed upward and fog drips of the grout firstly touch the downward-swirling flue gas reverse flow, and then fall back owing to the effect of self-weight and drag force of the flue gas and then touch the forward flow of the flue gas, thus sulfur dioxide in the flue gases is absorbed owing to the quick chemical reaction with limestone grout fog drops. The spraying tower comprises a spraying tower shell; the spraying tower shell is provided with tangentially arranged flue gas inlet and outlet channels; a spraying device for spraying absorbing agents upwards is arranged between the flue gas inlet and outlet channels; a central tank is arranged in the center of the spraying tower shell; a flue gas guide plate showing a spiral descent structure is arranged on the central tank; a defroster is arranged in the flue gas inlet and outlet channels of the spraying tower shell. The desulfurization efficiency thereof is high, investment is small, and operation is safe and reliable.

The present invention relates to diffusion and absorption refrigerator, belongs to the field of diffusion and absorption refrigerating technology, and aims at raising the refrigerating amount of diffusion and absorption refrigerator to realize relatively large diffusion and absorption refrigerating system. The diffusion and absorption refrigerator is provided with solution circulating pump between the solution recovering unit and the absorbing unit, liquid ammonia circulating pump between the evaporator and refrigerating terminal, evaporator with stuffing, absorbing liquid circulating loop, liquid ammonia circulating loop and ammonia-hydrogen mixture gas circulating loop. By means of the small power solution circulating pump and liquid ammonia circulating pump and great power absorber and evaporator, great refrigerating amount may be obtained. The present invention is suitable for various kinds of diffusion and absorption refrigerating system.

The invention discloses an apparatus utilizing heat energy generated during platinum catalytic hydrogenation in cyclohexanone production for dehydrogenation technology, and belongs to the field of chemical engineering. The provided apparatus can utilize the heat energy discharged during the catalytic benzene hydrogenation reactions for the cyclohexanol dehydrogenation reactions. The apparatus supply heat energy to dehydrogenation reactions, the thermal efficiency is high, and the loss of heat energy in conversions is reduced. Moreover, the heat loss in pipelines for delivering the high-temperature heat conductive oil in a long distance is greatly reduced or even eliminated; the heat, which is brought out by the hot flue gas discharged from the fuel oil, fuel coat, or fuel gas heat conductive oil furnace, is also reduced or eliminated, thus the energy loss is reduced; at the same time, the operation time of the heat conductive oil furnace is shortened effectively, and the waste gas discharge is reduced.

The invention discloses a compound integrated heat source tower heat pump device which comprises a refrigerant circuit, a solution circuit, an air circuit and a cold and hot water circuit. According to the compound integrated heat source tower heat pump device, liberated heat in the process of undercooling of refrigerants is used as regenerated heat for solution, therefore, solution regenerated heat sources of a heat source tower heat pump system are efficiently obtained, integration of solution heat absorption and solution concentration control is achieved, and the heat source tower heat pump system can be compact and flexible. Meanwhile, the same air is utilized in a serial mode in the solution heat absorption process and the solution regeneration process, therefore, the solution can be high in regenerating efficiency, safe and reliable operation of the heat source tower heat pump system in various working conditions can be guaranteed, and comprehensive high-efficiency of the system is achieved.

A self-feeding double-pump non-clogging dredging machine comprises a floater, a diesel engine, an oil pump, an oil tank, a slurry pump, and a lifting an operating device and six big parts of a machine head, wherein the floater floats on the water surface, the other devices are fixed on the floater, and when two spiral rollers whose spiral directions are opposite rotate, slurry is churned, and the rollers can advance or fall back simultaneously, an axial flow pump conveys slurry to the slurry pump, and the axial flow pump and the slurry pump are combined, which convey slurry to far distance. In the invention three devices which can effectively remove foreign matters, firstly, the two ends of the front end and rear end of the machine head is provided with a disk hobbing-cutter, secondly, a spike which is fixed can be overturned is installed beyond the disk hobbing-cutter, thirdly, the device is a combination of double pumps, a slurry-collecting funnel is arranged in front of a slurry-absorbing opening of the slurry pump, which is provided with an inclined screen mesh to prevent huge granular materials entering into the slurry pump, thereby completely guaranteeing to realize no clogging. The invention works with water, which is applied to dredging work hilly ponds, reservoirs, channels in countryside, and rivers and park lakes in cities.

The invention provides a combined single-side air inlet cooling tower. The combined single-side air inlet cooling tower comprises a first tower body, a second tower body and a circulating water systemtower outer part, wherein the first tower body, the second tower body and the circulating water system tower outer part are abutted on the back; a first water remover, a first water distributor, a first packing layer and a first water collecting device are sequentially arranged in the first tower body from top to bottom, and a first water collecting tank is arranged at the lower part of the firstwater collecting device; a second water remover, a second water distributor, a second packing layer and a second water collecting device are sequentially arranged in the second tower body from top tobottom, and a second water collecting tank is arranged at the lower part of the second water collecting device; and the first water collecting tank and the second water collecting tank are simultaneously connected with a water collecting tank, the water collecting tank communicates with the circulating water system tower outer part, and the circulating water system tower outer part is respectively connected with the first water distributor and the second water distributor. The combined single-side air inlet cooling tower provided by the invention has the advantages of saving energy consumption and improving the economic and environmental friendliness of the cooling tower on the basis of ensuring the cooling efficiency and the ventilation effect of the cooling tower.

The invention relates to a water pumping technique, which uses aeration as a driving force, has micro pump lift, large flow capacity and low energy consumption, is suitable for any occasions needing to obtain a low water head (generally between 0.2 and 1 meter), and has functions of increasing oxygen and promoting odorous substances to dissipate at the same time. An aerated drawing water device unit consists of a horizontal guide flow cylinder, a vertical aerated cylinder, a sliding sleeve gasket, a floating telescopic cylinder, a ring-shaped floating body, a microporous aerated tray, an aerated tray mounting pipe frame, a gas delivery pipe and a Roots blower, and is arranged on a bank between a water supply body and a water receiving body. When the Roots blower is started, the microporous aerated tray is aerated, a water column in the vertical aerated cylinder is fully filled with bubbles to reduce specific weight, liquid level rises to overflow, complementing water flow is formed in the horizontal guide flow cylinder, water in the water supply body is pumped into the water receiving body continuously, a water head of 0.2 meter can be formed between the two water bodies, and oxygen is increased by 2 to 3 milligrams per liter. According to engineering requirements, a plurality of the aerated drawing water device units can be arranged in series, in parallel or in series-parallel, so as to obtain required flower flow and drawing water height. The engineering technology can be used for driving water current circulation inside a landscape water body, promoting large flow exchange between adjacent water bodies, driving circulation of bypass water circulating systems, lifting water with low pump lift and increasing oxygen inside wetland parks and water quality purifying engineering, and the like; and the water pumping technique has the advantages of simplicity and reliability, pollution and erosion resistance, economy and practicability, and the like.

The invention discloses a low-lift water pump selection method based on impeller nominal average flow speed. The method is used for water pump selection for a low-lift pump unit. The method can enable the hydraulic performance of a high-performance axial-flow pump and a tubular pump to be better, wherein the high performance axial-flow pump and the tubular pump are relatively low in specific speed. The method is more applicable to the low-lift pump unit, can comprehensively improve the hydraulic performance of the low-lift pump unit, and belongs to the technical field of hydraulic engineering pump stations. The method is characterized in that a concept of the impeller nominal average flow speed is introduced in the method; the pump selection is not restricted by the correspondence of the lift and the specific speed in a conventional water pump selection method for the low-lift pump unit, and the water pump selection for the low-lift pump unit is performed based on the adjustment of the impeller nominal average flow speed; and the diameter of a water pump impeller is properly increased and the water pump rotating speed is properly reduced, the lift and the critical cavitation allowance of a water pump high-efficiency zone are reduced, the head loss of a flow channel is reduced, and the hydraulic performance of the low-lift pump unit can be comprehensively improved. The low-lift water pump selection method can substantially improve the hydraulic performance of the large low-lift pump unit, and plays an important role in guaranteeing the stability and high operation efficiency for a low-lift pump station.

The invention provides an energy-saving and pollution-resisting water treatment system provided with RO (reverse osmosis) membranes. The energy-saving and pollution-resisting water treatment system comprises a raw water tank, a main raw water pipeline, a main produced water pipeline, a main concentrate water pipeline and a plurality of RO membrane elements connected in parallel, wherein produced water of the RO membrane elements converges at the main produced water pipeline, concentrate water of the RO membrane elements converges at the main concentrate water pipeline, a system water inlet valve 1 is arranged on each branch raw mater pipeline, and a concentrate water reflux valve 2 and a concentrate water control valve 3 are arranged on each branch concentrate water pipeline; and the water treatment system further comprises compressed air pipelines converged with the branch raw water pipelines. The water treatment system adopts a mode of total parallel connection of single membrane elements, and the operation energy consumption is lower; and the operation mode of intermittent water production and intermittent air-water joint flushing is adopted, and the recovery rate of the system can reach 80%-90%.

The invention provides a bidirectionally-flowing nanofiltration membrane water treatment system and method. The system comprises a water tank, a membrane component and a valve component, wherein the water tank is connected with the membrane component through the valve component; the membrane component comprises a component main body and a convergence pipeline, the component main body is formed by arranging multiple membrane elements in parallel, a water inlet pipeline and a water concentrating pipeline are arranged at the two ends of the membrane elements respectively; the valve component is communicated with the convergence pipeline. According to the bidirectionally-flowing nanofiltration membrane water treatment system, a bidirectionally-flowing mode is adopted for conducting nanofiltration membrane water treatment in an alternate mode, and the pollution resistance of the nanofiltration membrane elements is improved.

The invention discloses a novel hydrogen oxygen rocket engine system. The novel hydrogen oxygen rocket engine system comprises a hydrogen turbine pump, an oxygen turbine pump, an oxygen supplementingcombustor, an oxygen supplementing valve, an oxygen main valve, an oxygen turbine gas exhaust valve, a hydrogen main valve, a thrust chamber and a hydrogen turbine gas exhaust valve. The hydrogen turbine pump and the thrust chamber are connected through the hydrogen main valve and a pipeline, and the hydrogen turbine pump and the head of the thrust chamber are connected through the hydrogen turbine gas exhaust valve and a pipeline. The oxygen turbine pump and the head of the thrust chamber are connected through the oxygen main valve and a pipeline, and the oxygen turbine pump and one side of the oxygen supplementing combustor are connected through the oxygen supplementing valve and a pipeline. One end of the oxygen supplementing combustor and the oxygen turbine pump are connected through apipeline, and the other end of the oxygen supplementing combustor and the head of the thrust chamber are connected through the oxygen turbine gas exhaust valve and a pipeline. By the adoption of thenovel hydrogen oxygen rocket engine system, the engine system scheme is simplified, the overall performance of an engine can be conveniently improved, the complexity of the sealing design of the oxygen turbine pump is effectively reduced, the working reliability is improved, and the helium consumption is reduced.

The invention discloses a water-saving, low-resistant and high-efficiency upward-spraying mine well exhaust air heat recovery device and a design method thereof. The upward-spraying mine well exhaust air heat recovery device has the technical points that the device comprises a water baffle, a water collection tank, a sedimentation tank, a water treatment device, a heat pump machine unit, a pipe row and a spraying nozzle, and is characterized in that the row pipe and the spraying nozzle are arranged on the bottom part in a diffusion tower, and the spraying nozzle sprays water upward; in the situation that the liquid droplets sprayed by the spraying nozzle are not broken, are not blown away and are not suspended, the distance H between the spraying nozzle and the top end of the diffusion tower is greater than and close to the maximum rising height Z of the liquid droplets sprayed by the spraying nozzle; various parameters of the device are optimized respectively by utilizing the newton's second law and a numerical simulation method. The heat exchange distance and the heat exchange time between the liquid droplets and exhaust air are increased by the optimized device; the kinetic energy of the exhaust air of a mine well is utilized effectively; the heat recovery efficiency of the device is improved. Water is not required to be sprayed downward after being conveyed to the top part by the device, but is sprayed upward directly, so that the power consumption of a water pump is reduced.

The invention discloses a limestone pulping and long-distance conveying device and a using method thereof. The limestone pulping and long-distance conveying device comprises a water supplementing pipe, wherein an inlet of the water supplementing pipe is provided with a fifth valve, an outlet of the water supplementing pipe is communicated with the top of a pulp box, the inlet of the water supplementing pipe and a long-distance conveying pipe are communicated, the long-distance conveying pipe is close to a second valve and is arranged at the back of the second valve, an inlet of a pulp backflow pipe is communicated with another long-distance conveying pipe between a pulp pump and the second valve, and a water feeding pipe is communicated with another long-distance conveying pipe which is close to a third valve and arranged at the front of the third valve. The using method of the limestone pulping and long-distance conveying device comprises a water supplementing pulping step, a pulp conveying step and a back flushing step. The limestone pulping and long-distance conveying device and the using method thereof, disclosed by the invention, have the advantages of largely shortening the length of the pulp backflow pipe, reducing the lift of the pulp pump and the pavement difficulty of a device, saving construction and operation costs, being capable of quickly preparing limestone pulp and improving production efficiency.

The invention relates to a novel circulation experiment water tank composed of a U-shaped elbow, wing-shaped flow deflectors, a bolt, a flange, steel wire nets, a straight tube, a cambered tapered tube, a minor-diameter straight tube, a U-shaped water tank body and a long tapered tube. The whole water tank is made of organic glass, and is high in transparency and mechanical strength, light and easy to machine. The wing-shaped flow deflectors are small in resistance and good in diversion feature, and the fluid flow speed is effectively controlled. The straight tube and the cambered tapered tube are connected through the bolt and the flange, and are convenient to dismount. The steel wire nets are installed in the straight tube section, a water flow vortex flowing from the U-shaped elbow is divided into small vortexes, the impact to the water tank is reduced, and the water flow tends to be straight. The long tapered tube effectively prevents an inner bounding layer of the long tapered tube from disengaging. The cambered tapered tube is in a streamline shape and effectively prevents a boundary layer from disengaging, the two ends of the cambered tapered tube are connected through the flange, and the cambered tapered tube is convenient to install and easy to replace. The novel circulation experiment water tank is good in adjusting performance, stable in operation, convenient to manufacture, even in internal fluid flowing speed and simple in structure, brings great convenience to the actual application, and can be widely applied to indoor hydraulics experiments.

The invention provides a spray irrigation grading water pumping variable-frequency energy-saving method for a mountainous slope tea garden. By aiming at the large-area mountainous slope scaled tea planting and modern agricultural economy development requirements, the method has high adaptability on the topography, the slope tea garden can be subjected to spray irrigation without the need of strictflatness; the field microclimate can be regulated, and the most proper ecological environment is created for the tea growth; the air humidity can be increased through tea spray irrigation; the tea growth is promoted; the tea yield and quality are improved; and the economic benefits and social benefits are improved. The method provided by the invention further improves and optimizes relevant technology of the engineering design of the mountainous slope tea garden and the variable-frequency energy-saving method by aiming at the topography features of high terrain and low water source of the mountainous slope. The slope spray irrigation system adopts a grading water lifting technology; the tea garden spray irrigation investment can be reduced; the spray irrigation energy source consumption can also be reduced; the tea garden operation cost is reduced; and the energy-saving effect of applying a frequency converter to a mountainous tea garden spray irrigation system is very obvious.

The invention provides an assembling method of a heating and ventilation integral machine room. The method comprises the following steps of: producing partial system assemblies required by the processing of the heating and ventilation integral machine room according to a drawing surveyed and mapped in advance; performing segmented packaging on all system assemblies required by the heating and ventilation integral machine room and transporting all of the system assemblies required by the heating and ventilation integral machine room to a construction field; and performing field splicing on the segmented packaged system assemblies. By aiming at the problems in the prior art, the invention aims at providing the assembling method of the heating and ventilation integral machine room and the heating and ventilation integral machine room assembled according to the assembling method, so that the defects of low assembling work efficiency, long installing work period and material waste of the existing machine room system are overcome; and the material-saving assembling method with high installation efficiency and the heating and ventilation integral machine room assembled according to the method are provided for machine room system assembly.