139results about How to "No backflow" patented technology

A Chinese-medicinal pulse state sensor, a pulse state tester with closed-loop control for testing the pulse pressure, and its test method are disclosed. Said pulse state sensor has a probe and two or more strain beams with both ends fixed to the surface of said probe and the semiconductor strain foil to form two or more attached sensors.

The invention discloses turbine-based combined cycle engine super-combustion chamber. Key parts of the super-combustion chamber comprise a shunt ring, a rear area-variable deflation valve, a flow guide tongue piece, a square lobe mixer, a first area fuel ejector, a center cone, a second area fuel injection ring, an evaporation tube flame stabilizer, a heat-isolating screen, a super-combustion chamber cylinder, an outer extending groove-width-variable radial flame stabilizer and an inner extending radial flame stabilizer. An internal flow field of the super-combustion chamber is reasonably distributed, the phenomenon of backflow from a punching duct to a turbofan duct can not occur, flow separation can not occur in the square lobe mixer, and the evaporation tube flame stabilizer can achieve soft ignition of the super-combustion chamber. The whole super-combustion chamber is high in mixing efficiency, little in cold flow resistance, high in combustion efficiency, reasonable in temperature distribution, and capable of meeting use requirements in a whole flight envelope of the super-combustion chamber in each work state and the requirement for boost of an turbofan ramjet.

The invention mainly aims at providing a device capable of realizing the continuous constant flow pumping of concrete and a control method of the device, wherein one sides opposite to one ends of a left distribution valve and a right distribution valve near a left pumping cylinder and a right pumping cylinder are respectively provided with baffle plates for preventing concrete backflow, a controller is respectively connected with a left pumping system and a right pumping system and is also connected with a system start and stop electromagnetic directional valve, a display is connected with the controller, and the pumping-out stroke time T1 of the pumping system is equal to the sum of the speed reduction time tp of the pumping-out stroke completion of the other pumping system, the material suction stroke time T2, the twice moving time 2t3 of the distribution valves, the three-times waiting time tw1+tw2+tw3 and the acceleration time tp of the pumping-out stroke starting. The device and the method have the advantages that the continuous uninterrupted and constant flow pumping can be realized, a Y-shaped pump outlet in a high pressure state and a hopper in a low pressure state always maintain separated and disconnected through the baffle plates, and the concrete backflow phenomenon cannot occur.

The invention provides a delay scheduling-based network traffic conflict prevention method and a delay scheduling-based network traffic conflict prevention system. The method includes: step 1: path performance detection is carried out on a default path within a probing cycle, and if the default path of an overlay network can meet the requirement of network transmission performance, step 2 is executed, or else step 3 is executed; step 2: traffic is transmitted via the default path; step 3: a transfer traffic calculation function is utilized to calculate transfer traffic to be transferred on the default path, and the transfer traffic is part of the traffic transmitted on the default path; step 4: path performance detection is carried out on alternate paths, the transfer traffic is allocated onto the alternate paths for transmission according to the carrying capacity of the alternate paths, and the steps are repeated in the next probing cycle. The invention solves the problem of vertical conflict in the prior art, prevents the phenomenon of frequent jitter caused by the optimization conflict problem of the conventional overlay network system, and guarantees the normal service performance of the overlay network.

The invention discloses an impregnating method of preparing an isostatic pressing graphite product. The impregnating method comprises the following steps: preheating the isostatic pressing graphite product by raising the temperature from room temperature to 330 DEG C; placing the preheated isostatic pressing graphite product in liquid asphalt to form an impregnating system, and applying pressure to the impregnating system, wherein the temperature of the liquid asphalt is 180-220 DEG C; after the applied pressure remains unchanged, cooling the impregnating system under the condition of pressurization until the temperature is 50-60 DEG C; and heating the cooled impregnating system until the temperature of asphalt in the impregnating system is above a softening point, while stopping heating when the temperature of the surface of the product is at the softening point of the asphalt, meanwhile, reducing the pressure of the impregnating system, discharging the asphalt, then cooling the impregnating system again until the temperature is 60-80 DEG C, and finishing impregnation. According to the impregnating method disclosed by the invention, isostatic pressing graphite is uniformly and deeply impregnated in the impregnating process, the problems of cracking, bursting and the like in the whole impregnating process do not occur, the growth rate of the impregnated graphite product is increased, and the asphalt on the surface of the graphite product can be recycled again.

The invention relates to a method for drawing raw coal gas out of coke oven. A device used comprises a riser water seal cover opening and closing control device on a coke oven side or coke side, a riser water seal cover, a riser lead-out device, a cooled low-pressure ammonia water spraying device, a high-pressure ammonia water spraying device, a bridge tube, a water seal valve body, a water seal valve disk, a water seal valve disk opening and closing control device and a gas collecting tube, and is characterized in that: the method adopts a downward inclined riser lead-out device for preventing ammonia water from flowing back, and the two sides of the riser lead-out device are connected with the bridge tube and a riser water seal seat respectively. The device has the advantages that: raw coal gas generated in production in coke oven can be led into the gas collecting tube smoothly without returning ammonia water; the drawback that sealing material in the valve disk is washed out of the socket of the valve disk when the U-shaped valve disk is washed by high-pressure ammonia water is overcome; and the operation is flexible, the overhaul is convenient, the structural arrangement is reasonable, and the energy-saving and environment-protection effects are obvious, and the like.

The invention discloses a manual breast pump, which comprises a feeding bottle for storing breast milk, a breast pump body and an operating handle, wherein the breast pump body is connected with the feeding bottle through a connection part arranged on the breast pump body; the body comprises a collection part and a low-pressure chamber which is connected with the collection part through a communication hole; an adjusting device is arranged on the operating handle; the adjusting device is a rotary body with a knob structure; the front end of the rotary body is provided with a protruded part and a flat part which form a positioning component; and the rotary body is clamped on a lock hole formed on the arc surface of the operating handle; and the lock hole has a clamping structure. The manual breast pump has the advantages of simple structure, convenience in disassembly, adjustable pressure, no backflow and capability of massaging a breast during use.

The invention provides a blocking valve, a grouting sleeve and a prefabricated component connecting method. The steel bar connection grouting sleeve has a sealed space, and can be automatically sealed after grouting, and the grouting degree can be observed in a grouting process. Compared with an existing open sleeve, the grouting sleeve has the advantages that higher pressure can be born in the grouting process, the grouting sleeve can be automatically sealed after grouting, and the grout fullness of the sealed space can be observed in the grouting process, thereby monitoring the grouting quality of the grouting sleeve. The blocking valve, the grouting sleeve and the prefabricated component connecting method can be widely applied to a grouting sleeve connection process in the technical field of building construction.

The invention discloses a sample introduction method and a sample introduction device for microfluidics detection of a fish-farming water environment. Two ends of a tank body are respectively connected with an A end extrusion pump and a B end extrusion pump, and a 10 mum level filter screen is arranged in a space between the A end extrusion pump and the B end extrusion pump in a cavity of the tank body. A sample introduction channel is connected with a microfluidics device outside the tank body, the top of the tank body is connected with a magnetic stirring and pumping pressure conveying structure through a sample channel, an original water sample in the fish-farming water environment can be automatically and fully stirred, cluster materials including cenobium and the like in the water sample can be automatically dispersed, and extrusion pumps at two ends are respectively extruded according to a certain sequence. After the dispersed sample is automatically guided in through a push type sample introduction mode, the introduced sample is filtered, the processes from sample dispersing, sample filtering, sample introduction to the filter screen cleaning can be completed in a full automation mode, the microfluidics detection is guaranteed to be carried out smoothly, and the degree of automation is high.

The invention belongs to the technical field of medical instruments, and relates to a disposable soft connecting band collection container and an anti-freezing vacuum blood taking needle of a bleeding opening. The disposable soft connecting band collection container is formed in the following mode that: a biological product anticoagulant coating layer is arranged on an inner cavity wall of a circular connector; one end of the connector is provided with a blood taking plastic duct; a vacuum valve is placed on the plastic duct; the other end of the plastic duct is provided with the circular connector; the inner cavity wall of the circular connector is provided with the biological product anticoagulant coating layer; one end of the connector is provided with a venous blood taking needle, while the other end is provided with a blood collection sample bottle needle; the blood collection sample bottle needle is connected with a blood collection sample bottle cap; the blood collection sample bottle cap is connected with a rubber plug; the rubber plug is connected with a blood collection sample bottle; and one side on the blood collection sample bottle close to the blood collection sample bottle cap is provided with a secondary bleeding opening. The disposable soft connecting band collection container and the anti-freezing vacuum blood taking needle of the bleeding opening can ensure that a blood sample generates no cruor and hemolysis so as to ensure the accuracy of the test result. The blood dosage during the test can be controlled flexibly so as to ensure repeated tests at any time or the addition of new testing items.

The invention discloses an automobile engine oil-gas separator. The automobile engine oil-gas separator comprises a lower hollow cavity (1) and an upper shell (2); a gas inlet pipe (4) where mixed oil and gas enters is connected to the lateral face of the lower hollow cavity (1); an oil outlet pipe (5) is arranged at the bottom of the lower hollow cavity (1); a gas outlet pipe (6) is arranged on the upper shell (2); the lower hollow cavity (1) is internally provided with a first separation mechanism and a second separation mechanism; the first separation mechanism comprises a separation support (8) used for guidance and a cavity body (20) communicated with the gas inlet pipe (4); the cavity body (20) is located in the upper portion of the lower hollow cavity (1); the upper end of the separation support (8) is fixed to the inner wall of the upper portion of the cavity body (20) in a sealed mode; the gas inlet pipe (4) and the outer circumference of the cavity (20) is in tangential connection. The automobile engine oil-gas separator is high in efficiency and good in filtering effect.

Provided is a medical dispensing machine. The medical dispensing machine is characterized in that the medical dispensing machine comprises a fixing frame, a driving mechanism, a sliding block, a guide rail, a syringe, a medicine pumping pipeline and a medicine discharging pipeline; the syringe is composed of a push rod and a needle cylinder which is fixed and supported on the fixing frame, and the push rod is fixedly connected with the sliding block; the sliding block can be driven by the driving mechanism to do rectilinear motion in the length direction of the syringe, the sliding block is located on the guide rail, and the guide rail is fixed relative to the fixing frame; a liquid outlet is formed in the head part of the needle cylinder, one end of the medicine pumping pipeline is connected with the liquid outlet, the other end of the medicine pumping pipeline is connected with a medicine bottle, the medicine pumping pipeline is internally provided with a first one-way valve, and the conducting direction of the first one-way valve is from the medicine bottle to the needle cylinder; one end of the medicine discharging pipe is connected with the liquid outlet, the other end of the medicine discharging pipe is connected with a liquid collector, the medicine discharging pipe is provided with a second one-way valve, and the conducting direction of the second one-way valve is from the needle cylinder to the liquid collector. The medical dispensing machine has higher accuracy, and the safety, simplicity and reliability of medicine pumping work of medial staff are improved.

A liquid container has an air open passage for causing a liquid chamber to communicate with an outside and introducing outside air into the liquid chamber as liquid in the liquid chamber is consumed, and an air chamber provided in a portion of the air open passage and capable of storing the liquid entering the air open passage. The air open passage includes a lower open passage having one end opened to the liquid chamber at a position close to an internal surface of a bottom wall of the liquid chamber and the other end opened to the air chamber at a position close to an internal surface of a bottom wall of the air chamber, and an upper open passage having one end opened to the air chamber at a position close to an internal surface of a ceiling wall of the air chamber and the other end capable of being opened to the outside.

The invention relates to a needle point shielding type anti-backflow venous indwelling needle, belonging to an infusion medical device; the needle point shielding type anti-backflow venous indwelling needle comprises the following accessories: a needle tube, a catheter, a catheter seat, a needle core, a reflux valve, a double-wing needle seat and a needle point shielding device. The venous indwelling needle is good in safety performance and convenient to operate, and the needle tube is completely protected in a guide slot after venipuncture, so that the medical workers or others are prevented from being hurt by the exposed needle tube, blood is prevented from flowing back, and the blood is avoided being polluted by contacting with the outside air.

The invention relates to the technical field of jetting glue-dispensing devices and particularly relates to a self-limiting impact type jetting glue-dispensing device. The self-limiting impact type jetting glue-dispensing device comprises a valve body with a cavity and a glue supplying base with a jetting cavity, wherein a push rod is arranged in the cavity, and a driver for driving the push rod is arranged in the cavity; a glue inlet and a glue outlet are formed in the jetting cavity of the glue supplying base, an impact rod is arranged above the glue outlet, is mounted in the jetting cavity in a sliding manner by virtue of a limiting nut and is driven by the push rod, and the limit impact position of the impact rod is limited by the limiting nut. When the self-limiting impact type jetting glue-dispensing device is used for jetting glue, the impact rod does not directly collide with a nozzle but collides with the limiting nut, so that particles are not crushed under the impact of the impact rod when liquid with the particles is jet.

The invention relates to a current path reconstruction type single-phase five-level rectifier. The rectifier comprises an alternating current power source VS, an inductor L, switching tubes S1, S2 andS3, diodes D1-D8, capacitors C1 and C2 and a load RL. According to the current path reconstruction type single-phase five-level rectifier of the invention, a plug-in diode uncontrolled rectifier bridge rectifying unit exists in the topological structure of the rectifier, the number of needed switches can be increased or decreased to a certain extent, switching tubes are applied to power factor correction, and therefore, on one hand, a circuit structure is simpler, and on the other hand, circuit control difficulty can be reduced. The rectifier can be widely applied to the field of single-phasesmall and medium-power rectifiers.

The invention provides a valve rod of a multi-path valve and the multi-path valve with the valve rod and belongs to the technical field of machinery. The valve rod and the multi-path valve solve the problem that the phenomenon of empty sucking of the existing multi-path cylinder cannot be eliminated, the cylinder is unstable in operation, and service life and integral performance of sealing members are influenced. The multi-path valve comprises a valve body and the valve rod arranged in the valve body, wherein an ascending working cavity, a descending working cavity, an oil inlet cavity and an oil return cavity are arranged in the valve body, a first guide assembly with an ascending guide opening and corresponding to one end of the valve rod is arranged on the valve body, and a second guide assembly with a descending guide opening and corresponding to the other end of the valve rod is arranged on the valve body; and by means of a first communication groove, a second communication groove and a third communication groove on the valve rod, the ascending working cavity can be communicated with the oil inlet cavity, the oil inlet cavity can be communicated with the oil return cavity, and the descending working cavity can be communicated with the oil return cavity or the oil inlet cavity. The multi-path valve can achieve energy recovering during descending of the oil cylinder, avoids the phenomenon of empty sucking of the descending working cavity caused by fast descending of the oil cylinder and prolongs service life of the oil cylinder.

The invention relates to an anti-reflux continuous bladder irrigation liquid collection bag which comprises a drip cup and a collection bag body. The upper portion of the drip cup is connected with an anti-reflux mechanism through a second drainage tube, the anti-reflux mechanism comprises an outer cylinder, an inner cylinder, a partition plate and a movable plug, an inlet and an outlet are formed in the upper end and the lower end of the outer cylinder respectively, the outlet is hermetically connected with the upper end of the second drainage tube, the bowl-shaped partition plate is arranged in the outer cylinder below the inlet, the upper end of the partition plate is fixed to the inner wall of the outer cylinder, an overflowing hole is formed in a central zone of the partition plate, the movable plug is arranged below the partition plate, a sealing column matched with the overflowing hole is arranged at the top of the movable plug, the movable plug is clamped in the inner cylinder, the inner cylinder is arranged in the middle of the outer cylinder, a liquid outlet channel is formed between the inner cylinder and the outer cylinder, an inlet of the liquid outlet channel is arranged on the upper side of the inner cylinder, a collection cylinder is mounted at the bottom of the movable plug, the lower end of the collection cylinder is open and positioned on the upper side of the outlet, and a sterilizing layer is arranged on the inner side of the collection bag body. Irrigation liquid can be prevented from reflux in accidental action by the anti-reflux mechanism, so that use safety of a patient is protected.

The invention relates to a simple microfluid flow velocity measuring device. The simple microfluid flow velocity measuring device is composed of a microflow chip and a bubble detection image collecting device, wherein the microflow chip is formed by a fluid flow velocity measuring channel, a bubble injection channel and a bubble generating channel. One end of the bubble generating channel is sealed, and the other end of the bubble generating channel is communicated with the fluid flow velocity measuring channel. One end of the bubble injection channel is sealed. The sealed end of the bubble injection channel is opposite to the sealed end of the bubble generating channel. A breathable waterproof membrane is arranged between the two sealed ends, and the bubble detection image collecting device is externally connected with a computer. The simple microfluid flow velocity measuring device has the advantages that the flow velocity measuring mode is simple, fluid cannot flow back into a gas channel, gas is separated from the fluid after an experiment, and direct measurement of the flow velocity of the fluid is achieved. The simple microfluid flow velocity measuring device is reasonable in design and simple in structure, and is highly integrated, the fluid cannot be polluted, and the simple microfluid flow velocity measuring device is suitable for measurement experiments, needing to measure the microfluid flow velocity losslessly, of micro-fluidic chips.

The invention discloses fully-premixed condensing type gas heat exchange equipment and a heat exchange method. In the condensing type gas heat exchange equipment, a combustion chamber is equipped witha fully-premixed burner to generate high-temperature flue gas, the combustion chamber is arranged at the central position in a shell, a primary heat exchanger includes a spiral coil arranged around the combustion chamber, a secondary heat exchanger includes a spiral coil arranged around the primary heat exchanger, the secondary heat exchanger communicates with the primary heat exchanger, a slit formed by the adjacent spiral coils is configured into a flue, and the high-temperature flue gas passes through the flue to go across the primary heat exchanger and / or the secondary heat exchanger forheat exchange.

The invention provides a rectal administration apparatus, comprising an injection part. The injection part is a hollow tubular part; the top end and / or the sidewall of the injection part are provided with liquid outlets; the other end of the injection part is provided with a liquid inlet. The rectal administration apparatus further comprises an auxiliary part; the auxiliary part easily deformable is connected with the injection part and partially protrudes out towards the outside of the sidewall of the injection part; the auxiliary part has the function of fully lubricating the rectal wall and the function of expanding the anorectum to stimulate bowel movement, thus promoting defecation. The defects of the traditional glycerol enema are overcome, the rectal administration apparatus is more convenient and quicker to use, and better treatment is provided for patients with constipation.

The invention discloses an aerial photography unmanned aerial vehicle preventing from falling and being damaged based on pneumatic deceleration, and relates to the technical field of unmanned aerial vehicles. The aerial photography unmanned aerial vehicle preventing from falling and being damaged based on pneumatic deceleration comprises a vehicle frame and four fan blades, and the four fan bladesare movably mounted on the four sides of the top of the vehicle frame correspondingly; deceleration mechanisms are fixedly mounted on the four sides of the top of the vehicle frame correspondingly, and the four fan blades are located in the four deceleration mechanisms correspondingly; an anti-falling mechanism is fixedly mounted in the middle of the top of the vehicle frame, and a three-way pipeis inserted in the vehicle frame in a penetrating mode; and the top end of the three-way pipe penetrates through the top of the vehicle frame and is inserted in the front face of the anti-falling mechanism, and a solenoid valve is fixedly mounted on the top section of the three-way pipe. According to the aerial photography unmanned aerial vehicle preventing from falling and being damaged based onpneumatic deceleration, the solenoid valve is opened to drain hydrogen in a hydrogen tank into an annular air bag, after the annular air bag is expanded to the limit, on the basis of the characteristic that the density of the hydrogen is smaller than that of air, the effect that the vehicle frame bears air buoyancy is greatly improved, and thus the overall falling speed of the unmanned aerial vehicle is decreased.

The invention discloses an alkali-removing method used for hydrogen production by borohydride. The method adopts solid purifying medium to remove alkali vapor in hydrogen produced by the borohydride, and the solid purifying medium is solid super acid or the combination of the solid super acid and water-absorption material. The alkali-removing method has the advantages of effectively saving the volume of a purifying device, having high alkali-removing efficiency, and effectively avoiding the backflow of acid liquor, and the alkali-removing device has universal property. The invention belongs to the field of gas purification.

The invention relates to a condensate water automatic discharging device for preventing the air leakage of a positive pressure area of an air processing device. The upper portion of a housing is connected with a condensate water inlet pipe, the lower portion of the housing is connected with a condensate water outlet pipe, the condensate water outlet pipe extends inside the housing, the inside end surface of the condensate water outlet pipe is provided with a lateral draining port, and a sealing ball is arranged above the draining port side of the condensate water outlet pipe and is connected with the draining port in a matching mode. The inner wall of the housing is provided with a plurality of ribs which protrude inwards, the sealing ball is disposed among the rib ends of the housing, and the sealing ball is separated from the rid ends by gaps. The condensate water automatic discharging device can divert condensate water in the positive pressure area of the air processing device outside for discharging, so that the condensate water automatic discharging device for preventing the air leakage of the positive pressure area of the air processing device has the advantage that when the condensate water in the positive pressure area of the air processing device outside is diverted outside for discharging, air inside the air processing device can be prevented from leaking outside through the condensate pipes and the working condition cannot be affected by the positive pressure inside the air processing device, and when the air processing device is powered off, the condensate water cannot backflow. The condensate water automatic discharging device for preventing the air leakage of the positive pressure area of the air processing device is applicable to the discharging of liquid water in the positive pressure areas of various air processing devices or similar devices.

The invention relates to the technical field of oxygen preparation, and particularly relates to a use method of pressure swing adsorption oxygen equipment. The equipment comprises two adsorption tanksand an oxygen buffer tank, a sealing cover is arranged in a tank opening in the upper side of each adsorption tank, a first gas guide pipe is fixedly connected with a desorption leading-out assembly,pneumatic switching valves are fixedly connected to the first gas guide pipe and a second gas guide pipe, a rotating rod is vertically arranged in each adsorption tank, a servo motor is fixedly arranged on the upper end face of each cylinder cover, a gas flow guide assembly in transmission connection with each rotating rod is arranged in an opening in the lower end of the corresponding cylinder cover, and an auxiliary desorption assembly in transmission connection with each rotating rod is arranged in the corresponding cylinder cover. The adsorption effect of the adsorption tanks can be improved, meanwhile, the flow direction of gas in the adsorption tanks is conveniently controlled, it is guaranteed that adsorption and desorption actions are not affected, an auxiliary desorption assemblyis further arranged to improve the desorption effect and efficiency, and an oxygen buffer tank is arranged and is used for controlling the oxygen pressure and controlling the oxygen temperature.

The invention belongs to the technical field of medical instruments, and particularly relates to a disposable hard connecting band collection container and an anti-freezing vacuum blood taking needle of a bleeding opening. The disposable hard connecting band collection container is formed in the following mode that: an anticoagulant coating layer is arranged on an inner cavity wall of a circular connector; one end of the connector is provided with a venous blood taking needle; the rear part of the connector is provided with a vacuum valve; the other end of the connector is provided with the blood collection sample bottle needle; the blood collection sample bottle needle is connected with a blood collection sample bottle cap; the blood collection sample bottle cap is connected with a rubber plug; the rubber plug is connected with a blood collection sample bottle; and one side on the blood collection sample bottle close to the blood collection sample bottle cap is provided with one secondary bleeding opening. The disposable hard connecting band collection container and the anti-freezing vacuum blood taking needle of the bleeding opening have the advantages that: the anticoagulant coating layer is added on the basis of the conventional hard connection type blood taking needle so that blood flowing out of a body can contact an anticoagulant; a blood sample is ensured to generate no cruor and hemolysis so as to ensure the accuracy of the test result; and the secondary bleeding opening is added so that a clinical inspector can flexibly control the blood dosage during the test to ensure repeated tests at any time or add new testing items.

The invention discloses a hot water supply system, and relates to the technical field of hot water supply. The hot water supply system comprises a water heater, a three-way valve, a water return pipeand a booster pump, wherein the tail end of a water inlet pipe of the water heater communicates with a first valve port of the three-way valve, a second valve port of the three-way valve communicateswith a water outlet pipe of the water heater, one end of the water return pipe communicates with the water outlet pipe of the water heater, and the other end of the water return pipe communicates witha third valve port of the three-way valve, and the booster pump is arranged at the tail end of the water inlet pipe. In the hot water supply system, by arranging the water return pipe, cold water inthe water outlet pipe of the water heater can return to the water heater for heating, and the purpose of instant opening and instant heating can be achieved; the water inlet pipe, the water outlet pipe and the water return pipe of the water heater are connected through the three-way valve, the booster pump is arranged at the end, close to the three-way valve, of the water inlet pipe, and when thebooster pump works, due to the fact that the pressure is large at the end, connected with the water inlet pipe, of the three-way valve, the backflow phenomenon does not occur under the action of the pressure difference by the water return pipe, and the purpose of increasing flow is achieved.

The invention discloses a tangential turbine runner comprising a runner shaft and bucket blades which are uniformly arranged on the circumference of the runner shaft. The quantity of the bucket blades is obtained by the formula that the radial length L of each bucket blade is equal to (2.2-2.5)d0 and is reduced by 10%-15% compared with the radial length of the regular bucket blade; the width B of each bucket blade is equal to (2.8-3.2)d0 and is increased by 9%-11% compared with the width of the regular bucket blade; the depth T of each bucket blade is equal to (0.95-1.15)d0 and is increased by 4%-6% compared with the depth of the regular bucket blade; and the root thickness X of each bucket blade is equal to (0.5-0.8)B. According to the tangential turbine runner disclosed by the invention, parameters of the radial length, the width and the depth of each blade bucket are changed, the root thickness of each bucket blade is increased, and the quantity of the bucket blades is calculated according to the researched bucket blade quantity determining formula, so that the nozzle quantity, the jet flow and the flowing inside the runner do not interfere with one another, and reflowing does not exist in the root part region of each bucket blade. The hydraulic loss is greatly reduced and the output power of a set is greatly improved; and the model hydraulic efficiency of the tangential turbine runner with the bucket blade structure is detected to reach 91.66%, which the highest efficiency value of the current same-type runners at home and abroad.

The invention discloses a process for preparing 2, 4-dinitro-6-chloroaniline by using a sulfuric acid method, which comprises the following steps: carrying out processing reaction on reaction raw materials by using a stirring device, discharging after the reaction is finished, and carrying out suction filtration; the stirring step comprises the following steps: A, putting reaction raw materials and sulfuric acid into a stirring barrel; b, starting a motor and driving a stirring rotating shaft to rotate, and driving a stirring plate to rotate by the stirring rotating shaft to stir the raw materials; c, chlorine is introduced into the raw materials in the stirring barrel through a ventilation structure before the raw materials are stirred; d, the stirring rotating shaft drives a control structure to move, and then the control structure drives a stirring plate to change the angle through a stirring adjusting structure; e, adjusting the angle of the stirring plate according to the rotating speed of the stirring rotating shaft through a speed adapting structure; and by arranging the ventilation structure, chlorine can be better ensured to be introduced into the solution, the solution is ensured not to flow back, and the mixing uniformity of the chlorine and the solution is better ensured.

The invention discloses an anti-thrombotic safety cap for a venous indwelling needle and a using method of the anti-thrombotic safety cap. The anti-thrombotic safety cap comprises a cap base body which covers an infusion cavity opening of an indwelling needle base in a sealing mode and a connecting body which is integrally formed with the cap base body and can be connected with the outer wall of the infusion cavity opening of the indwelling needle base. An enclosed type liquid storage cavity used for generating positive pressure is formed in a cavity of the cap base body, a flaky structure is arranged on the bottom face of the liquid storage cavity, and a micropore which is formed after the flaky structure is punctured by a puncture needle forms a micropore permeating structure through the elasticity of the micropore. After the puncture needle is pulled out, the micropore is closed automatically so that blood in an indwelling needle hose can be effectively prevented from flowing back. After positive pressure liquid medicine is stored in the liquid storage cavity, the micropore can be opened under the action of the positive pressure so that a microchannel can be formed, the liquid medicine in the liquid storage cavity can be slowly dripped into the indwelling needle hose and be pressed towards the inside of a vein blood vessel to prevent the blood from flowing back into the indwelling needle hose, and thrombosis formation can be prevented. The anti-thrombotic safety cap for the venous indwelling needle is novel and simple in structure, low in manufacturing cost, capable of achieving a reliable positive pressure function, and capable of effectively preventing blood return for a long time.