49results about How to "Reduce cavitation damage" patented technology

An apparatus for inducing cavitation at a surface of a specimen includes a cavitation chamber, a window extending through the wall of the chamber to an area outside the chamber, a test specimen positioned within the chamber, and a cavitation media inside the chamber and in contact with the surface of the specimen. A laser light source is disposed outside the chamber, and is operable to provide a laser beam through the window and into the cavitation media. The laser light source generates a shock wave in the cavitation media, the shock wave causing cavitation at the surface of the specimen.

The invention provides a probiotic composition for inhibiting helicobacter pylori and application, and belongs to the technical field of foods and medicines. The probiotic composition comprises four probiotics of lactobacillus rhamnosus, lactobacillus plantarum, lactobacillus reuteri and lactobacillus salivarius. The probiotic composition has a synergistic inhibition effect on the helicobacter pylori, can significantly inhibit the growth of the helicobacter pylori, reduce the gene expression level of virulence factors CagA, VacA and Ure, can turn helicobacter pylori of a helicobacter pylori infection model mouse into negative, and can effectively reduce the number of helicobacter pylori in a human body or turn helicobacter pylori into negative. The four strains of the probiotic compositionhave a mutual synergistic effect, and the helicobacter pylori inhibiting effect of the probiotic composition is remarkably superior to the single application effect of each strain.

The invention discloses a cavitation-erosion-resistant microstructure surface layer. The cavitation-erosion-resistant microstructure surface layer comprises a base and a micro-protrusion or micro-groove microstructure which is arranged on the surface of the base and used for resisting cavitation erosion; an air film is formed by air contained in micro grooves formed between micro protrusions or air contained in the micro grooves, so that an air film layer which is used for resisting cavitation erosion is formed between a solid interface and a liquid interface through the microstructure; and the micro protrusions or the micro grooves serve as protecting layers and are arranged on the easy-cavitation surface of the base. According to the cavitation-erosion-resistant microstructure surface layer, the micro-jet speed during collapse of cavitation bubbles is greatly reduced, or even the micro-jet direction is changed to be away from the structure surface, so that damage to the surfaces of materials by cavitation and cavitation erosion is effectively inhibited.

The invention discloses a cavitation-resistant structure surface layer. The surface layer comprises a base and an elastic material layer arranged on the surface of the base and used for resisting cavitation; the elastic material layer is inlaid in or adheres to the base as a protective layer and is located on the portion or surface, impacted by liquid, of the base. By means of the cavitation-resistant structure surface layer, cavitation damage can be effectively inhibited, and thus important parts can be protected.

The invention discloses a balance disc used in solid-liquid two-phase flow conveying. Blades uniformly distributed along the circumference at intervals are arranged at the edges of the circumferential surfaces at two sides of the balance disc; a notch slot is formed between each two adjacent blades; each blade is of a cylindrical rear bent blade; blind holes are uniformly distributed in the cylindrical side surface of the balance disc at intervals; bolts for adjusting balance disc counter weights are arranged in the blind holes in two sides in central symmetry; leaf springs and gaskets for finely tuning the counter weights are arranged between the bolts and the blind holes. The mechanical abrasion and the cavitation damage to the balance disc can be effectively reduced, the noise in the operation of a pump is reduced, and the service life is prolonged; when the balance disc is subjected to the dynamic balance adjustment, the balance quantity of the balance disc can be more conveniently adjusted under the condition that the counter weights on the surface of the disc body are not polished or spot-welded, and the vibration, noise and radial unbalance force which are generated in the motion process of the pump are reduced; the needs of pumps in the fields such as petroleum, chemical industry and water conservancy can be met.

The invention relates to a folded-line shape diversion pier of a spillway. The folded-line shape diversion pier comprises an upper pier, a middle pier and a lower pier or comprises a middle pier and a lower pier. The upper pier is a semi-cylindrical pier, the middle pier comprises a middle pier body, an overhead view surface of the middle pier body is an isosceles trapezoid, side view surfaces of the middle pier body are right triangles, a pier head in the shape of a semicircular oblique frustum with a small bottom and a large top is arranged on the front oblique surface of the middle pier body, the lower pier comprises a pier body in the shape of a triangular prism,wherein the overhead view surface of the pier body is a rectangle and the side view surfaces are right triangles, a pier body in the shape of an isosceles oblique trapezoidal prism with a small front portion and a large rear portion is arranged on the front oblique surface of the pier body in the shape of the triangular prism, side view surfaces of the pier body in the shape of the isosceles oblique trapezoidal prism are parallelograms, and a pier head in the shape of a semicircular oblique cylindrical table is arranged on the front oblique surface of the pier body in the shape of the oblique trapezoidal prism. The folded-line shape diversion pier has the advantages that the folded-line shape diversion pier has a regular size, stress on each pier head is simple, a downstream flow condition is improved, the construction difficulty is reduced, requirements on the strength of materials is lowered, and the folded-line shape diversion pier is adaptable to flow rate variation in a large range.

The invention provides a pressurized-water corrosion inhibiting structure for a water release building. The pressurized-water corrosion inhibiting structure comprises a communication pipe embedded into the water release building. Pressurized-water equipment is connected with the outside of the inlet end of the communication pipe. The outlet end of the communication pipe is communicated with the flow-passing wall face of the water release building and is a flat porthole. The pressurized-water corrosion inhibiting structure can press and pour a low-flow-speed water body to the bottom of a high-flow-speed area of the flow-passing wall face so that a low-flow-speed area can be formed between the flow-passing wall face and the high-speed water flow, and the high-speed water flow can not directly act on the flow-passing wall face. Meanwhile, the high-speed water flow and the low-speed water flow generate the shearing, blending and entraining effect, a large amount of water flow kinetic energy is consumed, the bottom flow speed of the high-speed water flow can be lowered, water flow cavitation is inhibited, and damage of cavitation corrosion and flush corrosion is avoided.

The invention relates to a dam spillway structure and a construction method thereof. The dam spillway structure comprises an obliquely-arranged spillway body bottom plate, a first side plate and a second side plate, wherein the first side plate and the second side plate are formed on the upper end face of the spillway body bottom plate; one end of the spillway body bottom plate is provided with aninlet, and the other end of the spillway body bottom plate is provided with an outlet; the spillway body bottom plate inclines downwards from the inlet to the outlet; a plurality of step bodies are arranged at the upper part of the spillway body bottom plate in the drainage direction; each step body comprises a flat surface and a vertical surface; a vent groove is formed in each vertical surface;each vent groove extends in the extending direction of the corresponding step body; one end of each vent groove penetrates through the second side plate; and gas is introduced into each vent groove.The dam spillway structure has the effect of improving the energy dissipation rate of a spillway.

The invention discloses a cavitation resistant valve core structure. Cavitation induction holes used for cavitation resistance are formed in a part, likely to be cavitated, of a valve core. The part likely to be cavitated is the part or the surface, impacted by liquid, on the valve core. The cavitation induction holes are uniformly formed in the surface of the valve core along the circumference. The cavitation induction holes can effectively guide cavitation jets into the cavitation induction holes, and cavitation collapse jet kinetic energy is consumed through fluids in the cavitation induction holes, so that impact of cavitated bubble collapse jets on the important part of a valve body is avoided, and cavitation on the surface of the valve body is reduced or suppressed.

The invention discloses a high attitude area dynamic water start-stop plane gate groove. The high attitude area dynamic water start-stop plane gate groove comprises a gate groove body, the ratio of the width W of the gate groove to the depth D of the gate groove is W / D=1.7-1.9, the ratio of the downstream alternate distance delta to the width W of the gate groove is delta / W=0.08-0.12, the slope ratio of downstream alternate distance delta to the length X of a slope is delta / X=1:13-15, and the distance Y between the downstream surface of the gate groove and a downstream breast wall is not smaller than 1.5 times the width W of the gate groove. Each circular bead formed in the corresponding slope alternate distance is R100-R80. Each internal circular bead of the gate groove is R100. By means of the high attitude area dynamic water start-stop plane gate groove, gate groove cavitation erosion and gate vibration brought by the gate groove cavitation erosion are reduced, and therefore the safety operation of the plane gate is guaranteed.

The invention provides a porous oil nozzle for oil and gas well testing. The porous oil nozzle comprises a hollow oil nozzle outer sleeve; an oil nozzle inner core is fixedly sealed in the oil nozzle outer sleeve; the inside of the oil nozzle inner core is provided with a plurality of vertically-through and parallel inner core ducts. The porous oil nozzle for oil and gas well testing solves the problems that conventional oil nozzles are liable to breakage, high in replacement cost, and liable to cause environmental pollution, apparatus damage and high potential safety hazards. The porous oil nozzle for oil and gas well testing realizes multiple jets and reduces erosion damage, so that the service life of the oil nozzle is prolonged and environmental pollution and potential safety hazards are prevented.

The invention provides a probiotic composition and application for inhibiting Helicobacter pylori, belonging to the technical field of food and medicine. The probiotic composition of the present invention includes 4 strains of probiotics: Lactobacillus rhamnosus, Lactobacillus plantarum, Lactobacillus reuteri and Lactobacillus salivarius. The probiotic composition has a synergistic inhibitory effect on Helicobacter pylori, can significantly inhibit the growth of Helicobacter pylori, reduce the gene expression levels of virulence factors CagA, VacA and Ure, and can make Helicobacter pylori infection model mice Helicobacter pylori. It can effectively reduce the number of Helicobacter pylori in the human body or make the Helicobacter pylori in the human body turn negative. The four strains of the probiotic composition have synergistic effects with each other, and the effect of inhibiting Helicobacter pylori is significantly better than the individual application effect of each strain.

The invention discloses a ship drag reducing method and system through using reverse bubbles. The method involving a reverse bubble generating device, and a reverse bubble transmitting device, whereinthe reverse bubble generating device is used for generating reverse bubbles and stored with first liquid. The steps comprise that inflating the reverse bubble generating device with gas, and then with a set speed, adding dropwisely second liquid into the device to generate suspended liquid droplets on the liquid surface; further, increasing the dropping speed to send the suspended liquid dropletsinto seawater to generate the reverse bubbles, wherein each reverse bubble is a gas-liquid structure, namely liquid contains gas films and the gas films are provided with the liquid; and finally, utilizing the reverse bubble transmitting device to transfer the reverse bubbles generated in the reverse bubble generating device on the surface of a ship body. According to the ship drag reducing method and system through using the reverse bubbles, the reverse bubbles are used for replacing common bubbles to realize ship drag reducing, which leads to a new drag reducing method; and by designing a special reverse bubble generating device to generate the reverse bubbles, the effect of ship drag reducing can be realized.

The application relates to a dam spillway structure and its construction method, which includes a channel bottom plate arranged obliquely, a first side plate and a second side plate formed on the upper surface of the channel bottom plate; one end of the channel bottom plate is the entrance, The other end is the exit, and the bottom plate of the channel body is inclined downward from the entrance to the exit; the upper part of the bottom plate of the channel body is provided with a plurality of steps along the drainage direction; the step body includes a straight surface and a vertical surface; There is a ventilation groove, the ventilation groove extends along the extension direction of the step body and one end runs through the second side plate, and gas is passed into the ventilation groove. The application has the effect of improving the energy dissipation rate of the spillway.

The invention discloses a double-seal linkage pilot valve element structure of a high-pressure-difference valve. According to the technical scheme, a fixing ring is installed and fixed on an outer circle of the lower end of a valve rod, and an inner valve element assembly is installed and connected to the lower end of the valve rod through the fixing ring. An annular boss is arranged on the outer circle of the valve rod, and a lower spring is pre-tightened and installed between the annular boss and the inner valve element assembly of the valve rod in a sleeved mode. The outer circle of an inner valve element is enclosed by an inner hole of the lower segment of an outer valve element in a sleeved mode, the outer valve element and the inner valve element move relative to each other in the axial direction while the valve is closed up, and a sealing ring is located between the outer valve element and the inner valve element. A platform at the upper end of the outer valve element is located on the upper side of the annular boss of the valve rod, a spring thrust ring is fixed to the valve rod, and an upper spring is pre-tightened and installed between the spring thrust ring and the upper plane of the outer valve element in a sleeved mode. A plurality of balance holes are formed in a valve element cover and the upper end of the outer valve element. According to the technical scheme, the double-seal linkage pilot valve element structure of the high-pressure-difference valve has the advantages that the valve can achieve high sealing capacity, scour and cavitation erosion damage to the sealing face is reduced, meanwhile, the using reliability of the valve is improved, and the service life of the valve is prolonged.

The invention provides a pressurized-water corrosion inhibiting structure for a water release building. The pressurized-water corrosion inhibiting structure comprises a communication pipe embedded into the water release building. Pressurized-water equipment is connected with the outside of the inlet end of the communication pipe. The outlet end of the communication pipe is communicated with the flow-passing wall face of the water release building and is a flat porthole. The pressurized-water corrosion inhibiting structure can press and pour a low-flow-speed water body to the bottom of a high-flow-speed area of the flow-passing wall face so that a low-flow-speed area can be formed between the flow-passing wall face and the high-speed water flow, and the high-speed water flow can not directly act on the flow-passing wall face. Meanwhile, the high-speed water flow and the low-speed water flow generate the shearing, blending and entraining effect, a large amount of water flow kinetic energy is consumed, the bottom flow speed of the high-speed water flow can be lowered, water flow cavitation is inhibited, and damage of cavitation corrosion and flush corrosion is avoided.