77results about How to "Avoid cavitation" patented technology

The invention provides a liquid storage tank capable of adjusting the amount of stored liquid, a refrigerating system and a control method.The liquid storage tank comprises an inner cylinder and an outer cylinder, an outlet pipe is arranged at the bottom of the inner cylinder so that fluid in the inner cylinder can be guided out, and a valve structure is arranged between the inner cylinder and the outer cylinder; in the compression refrigeration mode, the valve structure can guide fluid in the outer cylinder into the inner cylinder when the frequency of the compressor is increased, and the amount of the fluid discharged from the outlet pipe is increased. In the compression refrigeration mode, the valve structure can guide the fluid in the inner cylinder into the outer cylinder when the compressor is subjected to frequency reduction, and the amount of the fluid discharged from the outlet pipe is reduced; in the fluorine pump refrigeration mode, the valve structure can guide fluid in the outer cylinder into the inner cylinder, and the liquid level in the inner cylinder rises. According to the invention, the problem of refrigerant redundancy caused by difference of refrigerant filling amounts required under different operation conditions of a fluorine pump compression refrigeration system can be solved, and the problems of retention and release of refrigerant liquid are solved, so that better circulation amounts required by the refrigeration system under various operation conditions can be met as much as possible.

The utility model relates to the technical field of seeding, in particular to an air suction seed sowing device for plot breeding. The seed-metering device comprises a rear plate, a wheel groove is formed in the front end of the rear plate, a seed-metering disc is rotatably arranged in the wheel groove, the rear end of the seed-metering disc is rotatably and hermetically connected with the rear plate, a plurality of groups of adsorption holes are uniformly distributed in the upper circumference of the seed-metering disc, and a front plate is mounted on the front side of the rear plate. The whole seed bin is wedge-shaped, the rear end of the seed bin is open and is in sliding contact with the front end of the seed metering disc, and the front side of the seed bin can be opened and allows redundant seeds in the seed bin to be discharged. According to the utility model, the problem of frequent miss-seeding of a small amount of test seeds in the plot breeding process can be effectively solved, seed cleaning and seed changing are not mutually influenced, the seeding precision is improved, and passages between adjacent small fields are neat.

The invention discloses a furnace rear flue gas water-cooling comprehensive temperature control system and a matched cooling water amount control method, and particularly relates to the technical field of flue gas purification and environmental protection, the furnace rear flue gas water-cooling comprehensive temperature control system comprises a semi-dry desulfurization tower, a cyclone dust collector, a bag-type dust collector and a low-temperature SCR denitration device of which the output ends are sequentially communicated in series; the outlet flue of the cyclone dust collector and the inlet flue of the bag-type dust collector are respectively and fixedly communicated with a communicating flue which is connected with an electric air door in series, and the surface type water-cooling flue gas cooling system comprises a water-cooling flue gas cooler which is at least communicated with a cooling water supply pipeline. A comprehensive temperature control system combining a surface type water cooling flue gas cooling system and a flue gas emergency water spraying cooling system is adopted, a matched cooling water amount control algorithm is formulated from the enthalpy value heat balance principle, the surface type cooling water flow and the spraying water amount are accurately controlled, it is effectively ensured that the boiler rear flue gas temperature meets the flue gas purification process requirement, and the boiler rear flue gas purification efficiency is improved. Meanwhile, heat released in the flue gas cooling process is recycled, and the circulating efficiency of the power plant is further improved.

The invention discloses a water pump open-type impeller capable of inhibiting clearance cavitation and an open-type impeller pump, relates to the technical field of clearance cavitation inhibition of water pump impellers, and aims to solve the problem that a pump body vibrates due to the fact that blackspots and cracks appear on the surface of an existing water pump open-type impeller due to clearance cavitation, even the water pump open-type impeller falls off step by step in a spongy shape and generates noise. Comprising an impeller hub and blades, and the multiple blades are evenly arranged on the impeller hub in the circumferential direction. The side, directly facing the incoming flow of the water diversion pipe, of each blade is a water inlet edge, the side, corresponding to the downstream diffusion pipe, of each blade is a water outlet edge, the intersection point of each water inlet edge and the rim face is A, the intersection point of each water inlet edge and the hub face is B, and the impeller rim side wrap angle formed by the intersection point A and the vertical line and the longitudinal plane of the impeller hub axis is phi A, the impeller hub side wrap angle formed by the intersection point B and the vertical line and the longitudinal plane of the axis of the impeller hub is phi B, phi A is larger than phi B, and the difference value of phi A and phi B is 10-30 degrees.

The invention provides a shaft-seal-free pump and a liquid flow dividing and leakage preventing method. The shaft-seal-free pump comprises a pump body, a backflow pipe is arranged on the pump body, an impeller rear opening ring is lengthened or a lengthened sleeve is assembled on the inner side of the rear opening ring, the lengthened sleeve is matched with a pump cover rear end fixing ring to form a tail end gap, and a thread seal or a spiral blade seal is arranged at the tail end gap. And an open hole leading to the suction side or the low-pressure side is formed between the wear ring gap and the tail end gap. Through the static seal at the joint of the flow blocking sleeve and the pump cover, the seal design at the rear opening ring of the impeller and the thread seal or spiral blade seal at the tail end gap formed by matching the lengthening sleeve and the fixing ring at the rear end of the pump cover, liquid leakage is effectively prevented, the working efficiency of the pump is improved, and energy waste is reduced. Through the spiral groove and the liquid backflow system, part of liquid returns to the low-pressure position of the inlet of the pump body through the backflow pipe, recycling of the liquid is achieved, maintaining of pressure balance in the pump is facilitated, and the overall efficiency of the pump is improved.

The embodiment of the utility model provides a water turbine and a hydropower station. The water turbine comprises a water turbine body, an air supply pipe, an air supply system, an electric control valve and a pressure tester. The water turbine body comprises a volute and a draft tube communicated with the volute, and the draft tube is provided with an air supply port; the air supplementing pipe is provided with an air inlet end and an air outlet end, the air outlet end of the air supplementing pipe is connected with the air supplementing opening, and the air inlet end of the air supplementing pipe is communicated with the air supplementing system; the electric control valve and the pressure measuring instrument are both arranged on the air supply pipe, the pressure measuring instrument is arranged on the air supply pipe so as to measure the air pressure in the water turbine body, the electric control valve is used for measuring through the pressure measuring instrument, and the electric control valve is a normally closed electric control valve. The monitoring system is electrically connected with the electric control valve and the pressure measuring instrument. Therefore, the water turbine has the advantages of being good in air supply effect and capable of reducing the working pressure of the water turbine.

The vibration absorption device comprises a shell and a buffer piston which are coaxially arranged, the buffer piston is sleeved with the shell, and the vibration absorption device further comprises at least two buffer cavities, an oil inlet way and a balance valve which are distributed on the periphery of the buffer piston at intervals in the axial direction; the oil inlet path is arranged on the shell and is communicated with at least one buffer cavity; the buffer cavities are communicated through the balance valves, the balance valves are used for changing the communication relation between the buffer cavities according to the pressure difference between the buffer cavities, the buffer cavities can be communicated in time, the buffer cavities needing oil supplementing are subjected to oil supplementing, sudden pressure drop of the cavities is avoided, and the phenomena of negative pressure and cavitation are avoided. Damage to parts in the rock drill is reduced, and the vibration absorption effect is improved. The second aspect provides a rock drill comprising the vibration absorption device in the first aspect, an impact piston coaxially arranged in the buffer piston in a sliding mode, a bit shank coaxially arranged on the front side of the impact piston, and a plug buffer spacer bush arranged on the impact piston in a sleeving mode and located between the buffer piston and the bit shank.

The utility model relates to the technical field of liquefied natural gas (LNG) receiving stations, in particular to a system for mutually utilizing liquid nitrogen cold energy and boil-off gas (BOG) heat energy, which comprises a BOG direct output system, a BOG recondensation system and a liquid nitrogen system, the BOG direct output system comprises an LNG storage tank, the LNG storage tank is sequentially connected with a first BOG compressor and a first heat exchanger for providing a cold source by the liquid nitrogen system through a BOG pipeline, and the first heat exchanger is connected with a second BOG compressor through a BOG pipeline. The BOG outlet end of the first heat exchanger is communicated with a natural gas pipe network; the BOG recondensation system comprises a second BOG compressor, a second heat exchanger, a recondenser, a high-pressure pump and a first gasifier which are sequentially connected with the LNG storage tank through a BOG pipeline, the liquid nitrogen system provides a cold source through the second heat exchanger, the recondenser, the high-pressure pump and the first gasifier, and the outlet end of the first gasifier is communicated with a natural gas pipe network; and the in-tank low-pressure pump is connected with the re-condenser through a low-pressure output pipeline. The system is safe and reliable, energy stored by media of the system is mutually utilized, electricity charge is saved, noise is reduced, efficiency is improved, and compared with the prior art, the system has obvious advantages.

The invention provides a refrigerant circulation system for an air suspension compressor and a control method and device of the refrigerant circulation system. The system comprises a main refrigerant loop provided with an air suspension compressor, a condenser, an evaporator and an electronic expansion valve which are sequentially connected, a first inlet is formed in an air bearing of the air suspension compressor, a first outlet is formed in a machine body of the air suspension compressor, and the first inlet and the first outlet are both communicated to a cavity in the machine body; an outlet of the condenser is communicated to the first inlet through the liquid supply pipeline, and the first outlet is communicated to the evaporator through the liquid discharge pipeline; a pump body is arranged on the liquid supply pipeline, an exhaust pipeline communicated to the evaporator is further arranged on the liquid supply pipeline, and an exhaust valve is arranged on the exhaust pipeline. Through accurate control and an exhaust mechanism, on one hand, it is ensured that a refrigerant circulates in the system in the optimal state, on the other hand, stable operation of the pump body is ensured, the working efficiency of the pump body is improved, and then the efficient refrigeration effect is achieved.

The invention provides a protection method, device, equipment and medium for a nuclear power plant reactor, and the method comprises the following steps: obtaining water level data in a reactor pressure vessel in real time, and sending a low water level signal when the water level data is lower than a preset low water level; a protection signal is sent out according to the low water level signal; based on the protection signal, a safety injection system supplements coolant into the reactor pressure vessel and initiates a blowdown isolation function of the chemical and volume control system. By means of the protection method, device and equipment for the nuclear power plant reactor and the medium, water can be supplemented to the reactor core under the condition that a reactor protection system fails.

The utility model relates to a graphite processing device, in particular to a graphite crushing device which comprises an outer cylinder, a first motor is fixedly installed on the outer cylinder, a cam shaft is fixedly installed at the output end of the first motor, the cam shaft is rotatably installed in a groove formed in the outer cylinder, and the bottom of a movable jaw plate is rotatably installed in a groove formed in the outer cylinder. A motor support is fixedly installed on the outer cylinder, a second motor is fixedly installed on the motor support, a rotating disc is fixedly installed at the output end of the second motor, a poke rod is rotatably installed in a groove of the rotating disc and installed in a groove of a transverse limiting piece in a sliding mode, and the transverse limiting piece is installed in a groove formed in a longitudinal limiting piece in a sliding mode. The longitudinal limiting piece is fixedly installed on the outer cylinder, the poke rod is inserted into a strip-shaped through hole formed in the outer cylinder, and the jaw crusher has the advantages that in the jaw crushing process, the thrown raw materials are poked upwards, so that the graphite raw materials are evenly dispersed in the crushing range, the size of gaps between the graphite raw materials is reduced, and the purpose of improving the crushing efficiency is achieved.

The utility model discloses a diaphragm adjusting device of a diaphragm compressor under low-negative-pressure air inlet. The diaphragm adjusting device comprises a piston assembly, a crosshead assembly, an air distribution disc and an oil distribution disc. The three metal diaphragms are arranged between the gas side diaphragm cavity and the oil side diaphragm cavity in an overlapped mode, and the middle diaphragm is provided with a guide groove to be communicated with the leakage detection opening; the electromagnet is arranged on the surface layer, close to the diaphragm side, of the oil distribution disc; the piezoelectric ceramics are respectively fixed in the machine body assembly and are close to an upper dead center and a lower dead center of the crosshead assembly; the springs are fixed on the two sides of the machine body assembly, are insulated from the crosshead assembly and are used for triggering the piezoelectric ceramics; the electromagnets are electrically connected with the piezoelectric ceramics respectively; the switch is attracted and controlled by the electromagnet to switch on and off of a circuit; the slide rheostat is connected in series with the electromagnet to adjust the adsorption force; the spring impacts the piezoelectric ceramic when the crosshead assembly moves to the upper stop point and the lower stop point, current is excited to enable the electromagnet to attract the switch, and then power-on and power-off of the electromagnet are controlled.

The utility model relates to an oil transportation device and a wind generating set, the oil transportation device comprises: an oil storage member comprising a housing, a first end cover and a second end cover, the first end cover and the second end cover are arranged at the two ends of the housing in the axial direction and enclose together to form an accommodating cavity, an oil suction port and an oil return port are formed in the first end cover, an inflation port is formed in the second end cover, a piston is arranged in the containing cavity, an oil cavity is formed in the side, close to the first end cover, of the piston, and an air cavity is formed in the side, close to the second end cover, of the piston. The inflating part is connected with an inflating opening in the second end cover, and the inflating part is configured to inflate air into the air cavity so that the piston can move towards the first end cover; wherein the oil cavity is filled with oil, the oil suction port and the oil return port are respectively communicated with the oil cavity, and the oil storage piece is connected with the hydraulic pump through the oil suction port and the oil return port. The oil conveying device provided by the embodiment of the utility model can meet the use requirement under the rotating working condition, the phenomenon of air suction of the hydraulic pump is prevented, and the oil conveying device has safer and more stable oil conveying performance.

The utility model discloses an underground drainage filter head, which relates to the technical field of drainage filter heads, and comprises a cylindrical shell, a balancing weight and a buoyancy piece, a joint is arranged at the center of the top of the shell, a plurality of water inlets are uniformly arranged on the side surface of the shell, the balancing weight is arranged at the center of the upper surface of the bottom of the shell, and the buoyancy piece is arranged at the bottom of the shell. The buoyancy piece is arranged on the upper surface of the top of the shell, and the buoyancy of the buoyancy piece, the shell and the balancing weight is smaller than the gravity of the buoyancy piece, the shell and the balancing weight; the buoyancy of the buoyancy piece, the shell and the balancing weight is smaller than the gravity of the buoyancy piece, the shell and the balancing weight, the shell falls to the water bottom after being placed in water, and due to the fact that the top is light and provided with the buoyancy piece, and the bottom is heavy and provided with the balancing weight, the water drainage device can vertically stand in the water and cannot topple over, the water drainage working effect is better, and the cavitation erosion phenomenon can be avoided.

The invention relates to the field of ship lock navigation, and discloses a two-stage dispersed stepped ship lock water delivery arrangement and water storage channel water level control method, which comprises an open type water-saving pool, a water storage channel, a water supplementing pool and an overflow pool, and is characterized in that the water filling and drainage process is controlled through the water head difference between the graded water-saving pool and a lock chamber, and the ship lock operation water head is reduced; the water storage channel is used for storing and transporting water, water heads of the ship lock and the middle channel are lowered, water entering and exiting from the middle channel are reduced, and navigation water flow conditions in the middle channel are guaranteed; water supplementing and overflowing control of the water storage channel is based on real-time water level monitoring, and when the upstream and downstream water levels and the water level of the middle channel are not balanced, dynamic adjustment is conducted through the water supplementing pool and the overflowing pool to keep the water level of the middle channel constant, and safe passing of ships is guaranteed. The cascade ship lock effectively reduces the running water head of the ship lock, greatly reduces water entering and exiting from a middle channel, has a water-saving function, realizes efficient utilization of water resources, and is suitable for a cascade ship lock system with a large water head difference.

The application discloses a flow-adjustable multi-stage throttling device and application thereof, wherein the device comprises a front flange pipeline, a flow-adjustable component and a rear flange pipeline, and the front flange pipeline and the rear flange pipeline are tightly connected; the flow-adjustable component comprises a plurality of adjustable orifice plate assemblies arranged in the inner cavity of the flange pipeline formed by the front flange pipeline and the rear flange pipeline; each adjustable orifice plate assembly comprises a sealing cover plate, a bottom plate, an adjusting rod, a rotating disc and a driver; the adjusting rod is arranged in the mounting hole of the bottom plate, the rotating disc is mounted on the bottom plate, the driver is mounted on the sealing cover plate, and the throttling hole of the sealing cover plate and the throttling hole of the bottom plate are communicated to form a throttling window; the driver is used for driving the rotating disc to rotate when rotating; the rotating disc is used for driving the adjusting rod to enter or exit the throttling window through the rotating wheel, so that the effective throttling area of the throttling window is changed. The application can actively and low-noise adjust the flow under different working conditions.

The present invention relates to the technical field of lubrication of wind turbine gearboxes, and in particular to a lubricating oil for a yaw-pitch speed reducer of a wind turbine and a preparation method thereof. The lubricating oil comprises, by weight, 49-53 parts of metallocene polyalphaolefin, 23-28 parts of a functional fluid containing a low-viscosity and low-volatility polyalphaolefin base material, 15-20 parts of alkyl naphthalene, 2.5-3.0 parts of a composite additive package, 2-5 parts of an oiliness agent, 0.005-0.01 parts of a demulsifier, 0.02-0.03 parts of a defoamer, and 0.005-0.01 parts of a pour point depressant. The lubricating oil for a yaw-pitch speed reducer of a wind turbine according to the present invention has excellent high and low temperature performance, antioxidant performance, additive sensitivity, and foam stability; and the transmission energy efficiency is higher, and has an excellent energy-saving effect.

This invention discloses an integrated hydraulic system for a drive-and-recovery excavator and the excavator itself. The system includes: a first pump motor driven by a first motor, a second pump driven by a second motor, and a third pump driven by a third motor; the first pump motor is connected to a boom valve, which is connected to the boom cylinder; the second pump is connected to a boom regeneration valve, a boom valve, a bucket valve, and a stick valve; the boom regeneration valve is connected to the rodless chamber of the boom cylinder; the boom valve is connected to the boom cylinder; the rod chamber of the boom cylinder is connected to an oil tank via a check valve; the bucket valve is connected to the bucket cylinder; the stick valve is connected to the stick cylinder; and the third pump is connected to the stick valve, which is connected to the stick cylinder. This invention eliminates throttling losses caused by load differences during multi-actuator compound actions, achieves potential energy recovery during boom descent, improves the stability and flexibility of the boom descent process, and avoids cavitation.

The utility model discloses a plunger type pressure reducing valve with a high pressure reducing ratio, and relates to the technical field of pressure reducing valves. The valve comprises a valve body and a valve sleeve arranged on a partition wall in the valve body, a through hole is formed in the center of the valve sleeve, a plunger is arranged in the through hole in a sliding fit mode, two cylindrical annular grooves are formed in the inner wall of the through hole, and an annular partition wall is arranged between every two adjacent annular grooves. The upper planes of the two annular grooves and the annular blade edge on the frustum below the plunger are respectively used as valve seats of a valve port v3, a valve port v2 and a valve port v1; three groups of horizontally parallel notches are formed in the cylinder, each group is provided with three equant groove-shaped notches, guide surfaces are reserved among the notches, the lower planes of the upper two groups of notches and the first sealing gaskets serve as valve clacks of a valve port v3, a valve port v2 and a valve port v1 respectively, and the distances between valve seats of the valve ports and the valve clacks are equal; the pressure drop on each valve port and the flow speed of a medium flowing through the valve port are reduced, the problem of concentricity of three holes is avoided, and difficulties in machining, assembling and part movement are reduced.

The application belongs to the technical field of power generation, and particularly relates to a power supply device for automobile range extension, and more particularly to a direct-current power generation system and a working method thereof. The direct-current power generation system acquires the power of a power generation part in real time through a control module. When the power changes, the control module controls a pressurizing part to pressurize a power part cooling loop, and controls a connecting part to connect the power part cooling loop and the power generation part cooling loop, so that the high-pressure gas in the power part cooling loop enters the power generation part cooling loop, the gas pressure in the power generation part cooling loop is increased, the boiling point of the cooling liquid in the power generation part cooling loop is increased, and the cooling requirements of the power generation part and the power part are simultaneously met. When the power of the power generation part changes, the gas pressure in the power generation part cooling pipeline is increased, the boiling point of the cooling liquid therein is increased, and the cavitation effect caused by the local temperature rise and boiling of the cooling liquid due to the local eddy current caused by the power change is avoided.

The invention provides a buffering device and system based on a water conveying pipeline capable of stabilizing the water flow regime, and the buffering device based on the water conveying pipeline capable of stabilizing the water flow regime comprises a pipeline mounting seat, a ground mounting seat and a buffering mechanism; the invention further discloses a buffering system based on the water conveying pipeline capable of stabilizing the water flow state. The buffering system comprises the water conveying pipeline capable of stabilizing the water flow state and the buffering device based on the water conveying pipeline capable of stabilizing the water flow state. The vibration amplitude of the water conveying pipeline can be reduced, meanwhile, transverse circulation generated when water flow enters the turning position of the water conveying pipeline is reduced, cavitation of the water conveying pipeline caused by the transverse circulation and pipe explosion accidents caused by the transverse circulation are avoided, and the water conveying pipeline can be used for a long time.

The utility model provides a multilayer oil pump structure of a pedal motorcycle. The multilayer oil pump structure mainly comprises a shell I (1), a shell II (2), a shell III (3), a bottom cover (4), a driven chain wheel (5), an oil pump shaft (6), an inner rotor (7) and an outer rotor (8), the oil pump structure is characterized by being divided into three layers, each layer is provided with a shell (1-3), each shell (1-3) is provided with a pump cavity (9), each pump cavity (9) is internally provided with a group of eccentric inner and outer rotors (7 and 8) which are meshed and fixed in the pump cavity (9) and a bottom cover (4) for fixing the inner and outer rotors (7 and 8) at the bottommost layer in the pump cavity (9), and each layer of shell (1-3) and the bottom cover (4) are concentric according to a shaft hole (10), are provided with a positioning pin I (11) for positioning and are longitudinally and sequentially mounted. The shell I (1) is connected with the bottom cover (4) through a locking bolt (13) penetrating through the shell (1-3) and the bottom cover (4), and the locking bolt (13) is connected and locked with a matched internal threaded hole (14) formed in the shell I (1); an oil pump shaft (6) penetrates between the shell (1-3) and the bottom cover (4), each layer of meshing rotors (7 and 8) are connected in series, three pin holes (15) are formed in the shaft (6), a first cylindrical pin (16) passes through the pin holes (15), a rectangular groove (17) is formed in the center of each inner rotor (7), and the first cylindrical pins (16) penetrate through the oil pump shaft (6) to be installed in the rectangular grooves (17); each layer of shell is provided with a corresponding oil outlet channel (18) and an oil inlet channel (19) which are connected with different oil ways of an engine; five working cavities (20) are formed between the inner rotor (7) and the outer rotor (8), and the volumes of the five working cavities (20) change continuously. In the cavity on one side of the oil inlet cavity, as the rotors (7 and 8) are disengaged, the volume is gradually increased, the pressure is gradually reduced, and engine oil is sucked in. The engine oil rotates and flows along with the rotors (7 and 8) and is brought to one side of an oil outlet cavity, at the moment, the rotors (7 and 8) are in an engaged state, the volume is reduced, the oil pressure is increased, and the engine oil is extruded out of working cavities (20) of the rotors (7 and 8), enters the oil outlet cavity and is sent out.

The invention discloses a locomotive pump technology, and aims to provide a locomotive pump damping and noise reduction device and an operation method thereof, the technical scheme is that the locomotive pump damping and noise reduction device comprises a pump body, the pump body comprises a volute, an impeller and an inlet section, the impeller is arranged to be a staggered impeller assembly, and the number of blades of the staggered impeller assembly is eight. The blades are arranged in a staggered mode, the distances between the blades are designed through a mathematical model or an experiment optimization result, the distances between the blades are sequentially staggered to form staggered arrangement, the sum of the distances between every three blades is 90 degrees, the distance between two blades is 47 degrees, and the distance between the other two blades is 43 degrees, so that better pressure distribution and noise reduction effects are achieved; compared with the prior art, the locomotive pump damping and noise reduction device has the advantages that by adopting the design of the staggered impeller assembly, the impeller in the pump body can effectively reduce the disturbance of water flow in the operation process, so that the vortex and fluid vibration in the pump body are reduced, and the mechanical noise is further reduced; the invention is suitable for the technical field of locomotive pumps.

The application belongs to the technical field of tailings conveying, and discloses a buffer type stirring and slurry mixing device for tailings grading conveying, which comprises a stirring outer tank, a buffer inner tank movably arranged in the stirring outer tank, an elastic support structure for suspending the buffer inner tank on the stirring outer tank, and a self-adapting water inlet assembly and a mixing and stirring assembly. The application effectively prevents overpressure of a conveying pump and pipeline blockage caused by too thick slurry, avoids insufficient strength and segregation and delamination of a filling body caused by too thin slurry, and greatly improves process stability and safety of a filling system.

A design method for a large-skew contra-rotating propeller propulsion system of a high-speed underwater vehicle comprehensively considers the wake flow distribution characteristics of the tail of the underwater vehicle, and comprises the steps of selecting circular rector distribution matched with the wake flow distribution form, optimizing disc surface ratio and chord length distribution, designing reasonable skew and trim distribution, selecting proper profile thickness and camber distribution and the like. The invention aims to improve the propulsive efficiency, reduce the yawing moment and meet the design requirements on the premise of avoiding cavitation. Particularly, in the design process, the design scheme is iteratively optimized by combining CFD calculation and a potential flow theory method, it is ensured that the final scheme is optimal in the aspects of propulsive efficiency and cavitation performance, and the requirements of the high-speed aircraft are met.

The utility model discloses a kind of hydraulic equipment of turning and milling composite numerical control machine tool, it is related to numerical control machine tool technical field.The utility model includes hydraulic part, the hydraulic part is used to store hydraulic oil;Cooling part, the cooling part is installed above hydraulic part, the cooling part is used to cool hydraulic oil;And reject part, the reject part is installed inside hydraulic part, the reject part is used to filter hydraulic oil.The utility model is cooled by setting cooling box, specifically is that redundant hydraulic oil enters into overflow pipe, then again through overflow pipe into butt block, and enter inside cooling pipe, then start motor, motor starts to drive fan rotation, then again through fan rotation to suck the airflow outside to cooling box inside, then through the flow of airflow to cool the hydraulic oil inside cooling pipe, and re-enter hydraulic tank through discharge pipe, prevent backflow hydraulic oil because temperature is too high, make it appear cavity phenomenon.

The invention relates to the technical field of refrigeration transmission and distribution systems, and discloses a variable type super-efficient transmission and distribution refrigerating machine room which comprises a channel steel base, a softened water tank is fixedly installed on the channel steel base, a water inlet pipeline is fixedly connected to one side of the softened water tank, a transmission and distribution assembly is arranged on the channel steel base, and a water outlet pipeline is fixedly connected to the other side of the softened water tank. The transmission and distribution assembly comprises a positive displacement filter. According to the variable super-efficient transmission and distribution refrigerating machine room, in order to enable the device to adapt to dynamic requirements of refrigeration of various buildings, the transmission and distribution assembly is arranged, the effective filtering area of the assembly matched with a volumetric filter is larger than that of a traditional Y-shaped filter, water inlet resistance is greatly reduced, and the transmission and distribution assembly is matched with a first pressure transmitter, a second pressure transmitter, an electric blow-down valve and a rotary steel brush; automatic pressure difference detection and automatic dirt cleaning and discharging are achieved, cavitation of the water pump is avoided, the large end suction pump, the middle end suction pump and the small end suction pump convenient to disassemble are combined to form seven flow gears, stepless adjustment is achieved through fine adjustment of a frequency converter, and dynamic load changes are matched.

A novel hydraulic pump station for mining includes an oil tank, a frame, and a control valve assembly mounted on the oil tank. The oil tank is located on top of the frame, and an oil pump assembly is mounted on the frame directly below the oil tank. The interior of the oil tank is divided into a return oil zone and an intake oil zone by a partition. The oil inlet of the oil pump assembly is connected to the intake oil zone via an oil suction filter, and the oil outlet of the oil pump assembly is connected to the inlet of the control valve assembly via a two-stage high-pressure filter. Water coolers and spray mechanisms are installed on both the front and rear sides of the oil tank. The water inlet of the water cooler is connected to a mining static pressure water supply system, and the water outlet of the water cooler is connected to the water inlet of the spray mechanism. The oil inlet of the water cooler is connected to the return oil port of the control valve assembly, and the oil outlet of the water cooler is connected to the return oil zone via a return oil filter. This invention features a compact overall structure, meets the requirements for use in confined spaces, and offers high cooling efficiency.

The vehicle-mounted multi-duct underwater propeller comprises a pipe body and a rotor, and a first duct and a second duct which are communicated with each other are arranged in the pipe body; in the direction from the first duct to the second duct, the inner diameter of the first duct is gradually increased from the end, away from the second duct, of the first duct to the end, close to the second duct, of the first duct; the rotor is rotationally arranged in the water inlet end of the second duct. By additionally arranging the first duct and the second duct, water flow is guided to be sprayed out from a specific outlet, and it is guaranteed that the propeller can be applied to a vehicle. The inner diameter of the first duct is gradually increased from the end away from the second duct to the end close to the second duct, so that water flow is gradually decelerated, the inlet pressure of the rotor is increased, and the rotor is assisted to avoid cavitation. And by reducing the chord length, reducing the load of a low-pressure area, unloading the low-pressure area of the rotor and increasing the pressure of the low-pressure area, the cavitation phenomenon generated when the pressure is lower than medium saturated vapor pressure is avoided, and the working efficiency of the propeller is improved.

The utility model relates to a crude wine reflux device for an alcohol production line, which belongs to the field of alcohol production equipment and is characterized in that an inner bin body is arranged in a crude distillation tower of the crude wine reflux device for the alcohol production line, a jacket is arranged between the inner bin body and the crude distillation tower, a heating pipe is arranged in the jacket, and fermentation liquor is heated and distilled in the inner bin body in a waterproof manner; the inner bin body is internally provided with a separation net, impurities and floating foam are blocked in the crude distillation process, steam generated by heating in the crude distillation tower is recycled to the aldehyde tower after being condensed for three times, and a backflow temporary storage tank is additionally arranged between the condenser and the aldehyde tower; condensate enters the backflow temporary storage tank, the pump body pumps liquid from the backflow temporary storage tank, the flow of the crude wine is balanced, pump body evacuation is avoided, cavitation of the crude wine backflow pump is avoided, and the service life is prolonged.