2350 results about "Tube diameter" patented technology

An intraluminal device implantable in a blood vessel having an aneurysm therein in the vicinity of a perforating vessel and/or of a bifurcation leading to a branch vessel. The intraluminal device includes a mesh-like tube of bio-compatible material having an expanded condition in which the tube diameter is slightly larger than the diameter of the blood vessel in which it is to be implanted, and the tube length is sufficient to straddle the aneurysm and to be anchored to the blood vessel on the opposite sides of the aneurysm. The mesh-like tube also has a contracted condition wherein it is sufficiently flexible so as to be easily manipulatable through the blood vessel to straddle the aneurysm. In its expanded condition, the mesh-like tube has a porosity index of 55%-80% such as to reduce the flow of blood through its wall to the aneurysm sufficiently to decrease the possibility of rupture of the aneurysm but not to unduly reduce the blood flow to a perforating or branch vessel to the degree likely to cause significant damage to tissues supplied with blood by such perforating or branch vessel.

An intraluminal device implantable in a body lumen having an atheroma therein in the vicinity of a side-branch vessel includes a mesh-like tube of bio-compatible material formed with liquid-permeable window openings. The mesh-like tube has an expanded condition in which the tube diameter is slightly larger than the diameter of the body lumen in which it is to be implanted, and the tube length is sufficient to cover the atheroma and the side-branch orifice, and to be anchored to the body lumen around the periphery of the atheroma, and a contracted condition wherein it is sufficiently flexible so as to be easily manipulatable through the body lumen to the site of the atheroma. The mesh-like tube, in its expanded condition, has window openings of a size and distribution such as to structurally stabilize the atheroma and to keep embolic material originating from the atheroma in place on the wall of the body lumen, while diverting embolic material of predetermined size present in the blood flowing through the mesh-like tube from the side-branch orifice, without substantially impeding the blood flow, or increasing the thrombogenitic properties, of the blood flowing into the side-branch orifice.

The invention relates to a drive running mechanism of a pipeline robot, which mainly solves the problems of the existing drive running mechanism of the pipeline robot that the pulling force is smaller, the pipe diameter adaptability is poorer, the ability of surmounting obstacles is insufficient and the like. The invention is characterized in that the drive running mechanism also comprises a wheel leg regulating motor arranged in a body, three running drive units arranged outside the body, three elastic wheel leg support units formed by combining a front support connecting rod, a rear support connecting rod and a regulating connecting rod, and a pipe diameter adaptation adjustment unit; and the body, the front support connecting rod, the rear support connecting rod and running drive units form a parallelogram wheel leg structure; after sensing the pressure from pipe walls, the pipe diameter adaptation adjustment unit regulates the front support connecting rod and the rear support connecting rod so as to adapt to the pipe diameter changes; and each running drive unit is driven by two motors so that larger pulling force can be ensured. The mechanism of the invention has larger pulling force, larger pipe diameter regulating range and better ability of surmounting the obstacles; and compared with the prior art, the mechanism has high transmission efficiency.

A system includes a multi-tube fuel nozzle. The multi-tube fuel nozzle includes a fuel conduit, a fuel chamber coupled to the fuel conduit, and multiple tubes concentrically arranged in multiple rows about a central axis of the multi-tube fuel nozzle and extending through the fuel chamber to a downstream end portion of the multi-tube fuel nozzle. The multiple tubes include fluids flow and different flow control features including at least one of different fuel/air premixing ratios, different tube diameters, or different outlet distances relative to the downstream end portion.

A reactor system for the epoxidation of ethylene, which reactor system comprises an elongated tube having an internal tube diameter of more than 40 mm, wherein contained is a catalyst bed of catalyst particles comprising silver and a promoter component deposited on a carrier, which promoter component comprises an element selected from rhenium, tungsten, molybdenum and chromium; a process for the epoxidation of ethylene comprising reacting ethylene with oxygen in the presence of the catalyst bed contained in the reactor system; and a method of preparing ethylene glycol, an ethylene glycol ether or an ethanol amine comprising obtaining ethylene oxide by the process for the epoxidation of ethylene, and converting the ethylene oxide into ethylene glycol, the ethylene glycol ether, or the ethanol amine. Preferably, the internal tube diameter is at least 45 mm.

The invention relates to a diameter-variable tube washing robot with parallel four-rod device, wherein it is formed by several same tube washing devices, that connected by flexible springs; each unit is formed by support, flexible panel and washing head; the support is formed by several parallel four-rod devices around the central axle; via torsion spring, the parallel four-rod device will open, and the rolling wheel on the swing rod will contact the inner wall of tube, to support the whole tube washing device; when meeting obstacle, the four-rod device will overcome torsion spring to contract; the washing head is mounted on the connecting rod of four-rod device, to contact the inner wall of tube via spring; the flexible panel on the back swing rod can block the inner fluid, to generate pushing force, and move the support forwards. The invention can avoid additive powder and clean any tubes.

The invention relates to a method for preparing an ordered porous anodic titanium dioxide nanotube array. The method can prepare an ultra-large area defect-free titanium dioxide nanotube array film, the surface layer is the porous shape like an anodic aluminum oxide template, and the lower layer is a nanotube ordered array, thereby overcoming the common problems of easy lodging and aggregation of tubes in the prior art of preparing the anodic titanium dioxide nanotube array and simultaneously solving the problems that the prepared nanotube array film has more surface defect corrosion pits and the sediment blocks tube mouths. The nanotube array can realize the controllable growth by controlling the preparation conditions and the process and obtain the ordered array films with different tube diameters, different wall thicknesses and different tube lengths. The diameter range of the nanotubes is 20-200nm, the wall thickness range is 5-30nm, and the length range of the titanium dioxide tubes is 100nm-1mm. The invention particularly relates to a technology which can effectively and completely strip the titanium dioxide array film, effectively strip a titanium substrate from the TiO2 nanotube array and obtain the different sizes of porous nanotube array self-support films.

The invention relates to an opening type circular-pipe crawling detection device. The opening type circular-pipe crawling detection device comprises a driving mechanism, a track clamping mechanism and a detecting mechanism, wherein the track clamping mechanism is opening-ring-shaped, the two ends of the track clamping mechanism are respectively provided with a set of driving mechanism, and the detecting mechanism is fixed at the inner side of the track clamping mechanism; the track clamping mechanism is a circumferential and telescopic articulated structure formed by connecting rings and sleeve rings which are arranged at intervals, and the connecting rings extend into the adjacent sleeve rings and are connected with the sleeve rings by connecting ring racks; an inner rack track of the detecting mechanism is a blocking type track and is provided with a sliding clamping seat; the sliding clamping seat is in sliding connection with the inner rack track; a detecting motor drives a driving wheel which is meshed with the inner rack track; and an ultrasonic wheel type probe is arranged at the outer side of the inner rack track. The opening type circular-pipe crawling detection device has the advantages that the detection range can be changed in a freely-telescopic manner, and the quantity of the connecting rings and the quantity of the sleeve rings can be increased according to the need so as to adapt to different pipe diameters, and the pipeline can be detected comprehensively.

The invention relates to a spiral pipeline inner wall grinding and polishing robot suitable for different pipe diameters, and belongs to the field of pipeline robots. A hub assembly and a cross-axis universal joint are mounted in a spline fit manner, three driving wheel grinding assemblies are arranged, two ends of drive shafts of the assemblies and a drive shaft support in the hub assembly are mounted in a matched manner through bearings, a motor and control and power assembly is mounted on a direction keeping mechanism, and a motor shaft of the assembly and the cross-axis universal joint are mounted in a spline fit manner. The spiral angles of the grinding assemblies relative to the cross section of a pipe fitting are adjusted in a self-adaptation manner, and therefore the aim that the position with the small pipe diameter and many impurities is ground much, and the position with the large pipe diameter and few impurities is ground little is achieved, the robot can be matched with multiple different-size grinding assemblies for use, the aim that one robot has multiple purposes is achieved, and the cost can be saved to a certain degree.

A slurry bed reaction equipment and method of using the same is provided, wherein the equipment comprises an ascending tube reactor 1 and a settling tube 4; the lower part of the ascending tube reactor 1 is a reacting region 14, while the upper part of the ascending tube reactor is a settling region 2 with tube diameter enlarged; the top of the settling region 2 is provided with an exhaust port 6; the bottom of the ascending tube is provided with a feed port 3 and a gas distributor 5; a pipeline 7 is used for connecting the settling region 2 with the settling tube 4, of which the opening position is arranged at the inside of the settling tube 4; the lower part of the settling tube 4 is a magnetic separation region 15, of which the lower end is communicated with the lower end of the ascending tube reactor 1 through a conical spout 10 and a reflux pipe 11; the upper part of the settling tube 4 is provided with a liquid discharging hole 13. The space utilization ratio of the reactor is improved by adopting the equipment and the separation method of the present invention; meanwhile, the separation technology combining settling, magnetic separation and filtering are adopted, making the separation part small in equipment volume, high in efficiency and space saving.

The invention relates to a preparation method for electrode material of a super capacitor of an ordered nano-tube array structure. A titanium-base titanium dioxide nano-tube is used as a carrier of the electrode; metallic oxide with electrochemical activity is loaded on the tube wall surface of the nano-tube; functional electrode material of the nano-tube array structure is built, wherein the tube diameter of the nano-tube is 50-200nm, the wall thickness is 10-20nm and the length is 0.2-50 mu m. The preparation method is as follows: firstly, adopting the titanium-base titanium dioxide electrode carrier of the ordered nano-tube array structure prepared by a self-template anodic oxidation reaction synthetic method; then, taking the titanium-base titanium dioxide electrode carrier of the ordered nano-tube array structure as a working electrode and transition metal ion or noble metal ion water solution as working electrolyte, carrying out electro reduction-electro oxidation reaction by circulation, synthesizing a metallic oxide coating layer on the wall surface of the nano-meter tube in situ, and preparing electrode material with the electrochemical activity. The electrode material of the ordered nano-tube array structure is used as the stored energy application of the electrode of the super capacitor.

The invention relates to a novel numerical control bamboo splitting machine, which includes a lathe bed guide rail, a rotation mechanism, a driving chain, a bamboo tube loading mechanism, a bamboo tube diameter measurement device, a stepping motor, a cutter combination assembly, a bamboo centring combination assembly, a transmission system, a swinging mechanism, a push plate combination assembly, and a sash weight, and is characterized in that a push plate combination component is arranged on tool body guide rails; a driving chain for driving the push plate combination component to move back and forth is arranged between the two guide rails; a rotational cutter disc combination component is arranged at the front ends of the tool body guide rails; a bamboo tube loading mechanism is arranged on right sides of the tool body guide rails; two movable bamboo tube centering combination components are arranged on the upper left sides of the tool body guide rails; and when the push plate combination component does backlash motion, the bamboo tube loading mechanism conveys a bamboo tube into a measuring device to measure the diameter of a small head of the bamboo tube, the bamboo tube enters two V-shaped bearings, and combination cutters which are matched are rotated to the center of the bamboo tube and aligned; and a transmission system is reversed, and the push plate combination component pushes the bamboo tube to the combination cutters, so that the bamboo tube is split into bamboo chips. Compared with the conventional bamboo splitting machine, the numerical control bamboo splitting machine has the advantages that automatic loading, automatic tool changing and automatic centering of the bamboo tube are realized, one operator is reduced, the labor strength is lowered, the width error of the split bamboo clips is reduced, and the utilization rate of bamboo woods is improved.

The catalyst for preparing carbon nanotube has perovskite or perovskite-like structure. Under heating condition, the catalyst is reduced with hydrogen to produce hydroxide of RE or alkali earth element. During its preparation, salt or oxide of corresponding element is used as main material, and one or several of citric acid, tartaric acid, glycin and EDTA is used as complexing agent and burning agent to prepare the catalyst via gel burning synthesis process in water or ethanol solution. If necessary, ammonia or ammonium compound as pore creating agent may be added in the preparation process to increase the specific surface area of the catalyst. The catalyst makes the prepared carbon nanotube possess even homogeneous tube diameter and even high yield.

The invention discloses a preparation method of a visible-light activated cuprous oxide/titanium dioxide nano-composite photocatalyst and applications thereof, belonging to the technical field of environmental pollution control. The preparation of the catalyst comprises the following steps of: 1) carrying out electrochemical oxidation reaction under the action of hydrofluoric acid with the concentration of 0.2 percent by weight for preparing a titanium dioxide nanotube electrode, wherein the tube diameter of a nanotube is about 80nm, and the tube length is 550nm; and 2) adopting a photoreduction chemical method to prepare the cuprous oxide/titanium dioxide nano-composite photocatalyst. The prepared composite photocatalyst has the advantages of simple synthesis, stable performance, the synthesis process belonging to the field of green chemistry and the like. The composition of cuprous oxide can not only reduce the defect of high composite probability of photoproduced electron-hole pairs, but also expand the light response range of the titanium dioxide nanotube electrode and further improve the photocatalytic degradation efficiency thereof to organic pollutants in the visible light range, thereby having very high practical value and application prospect.

An improved method for manufacturing tube and fin heat exchangers that, according to a preferred embodiment, includes a process for increasing the stiffness and rigidity of heat exchanger fins. Stiffer fins have a greater tendency to maintain proper alignment within a stack of fins, which aids in lacing long stacks of fins with small (e.g., 5 mm) diameter tubing. Preferably, fin stiffness is increased by forming a plurality of longitudinal ribs within the fin during the fin stamping process. More preferably still, two ribs for each longitudinal row of collared holes are provided. The preferred embodiment also includes a slotted heat exchanger fin that is dimensioned and arranged for optimized thermodynamic performance when used with small diameter tubing, thus reducing the space required for a given heat exchanger system.

The invention discloses a method by which titanium dioxide nanometer tube array layer is prepared on surface of titanium base material, wherein the titanium base materials undergo the surface pretreatment and receive the electrochemistry anodic oxidation treatment in the electrolyte containing the HF acid, the components of the mixed electrolyte are that the ammonium dihydrogen phosphate is 1 to 3mol/L and the hydrofluoric acid is 0.2 to 0.4mol/L, as a result, the amorphous form titanium dioxide nanometer tube surface structure is achieved; the subsequent heat treatment condition is that under air atmosphere, the rate of temperature rise is 3 DEG C/min, the heat is preserved for 3 hours at the temperature of 450 DEG C, the anatase titanium dioxide nanometer tube array layer is achieved after being cooled in the furnace to the room temperature. The electrolyte system prepared based on the method of the invention can control the balance of oxidation and the corrosion within a relatively long time, thereby preferably realizing the control on the shape of the titanium dioxide nanometer tube. The invention has the advantages of easy operation, low cost and orientated and order distribution of the prepared titanium dioxide nanometer tube array; moreover, the amorphous form titanium dioxide nanometer tube is generated normal to the direction of the base; the tube diameter is 80 to 100nm, the wall thickness is 18 to 21nm, the tube length is 0.7 to 2.0um, thereby the specific surface area is large.

The invention belongs to the field of medical devices, and in particular to a great vascular stent delivery system capable of realizing a front-end back release function. The great vascular stent delivery system is composed of a locating guide head, a back release mechanism, a core tube, a middle tube, a sheath tube, a big handle, a small handle and a push rod which are sequentially arranged fromfront to back. The whole system has the advantage of simple mechanism, is convenient in operation and safe in use and is capable of effectively avoiding the phenomena of release in advance and failure in release; and meanwhile the stainless steel core tube is locally engraved into a spring, thus achieving the purposes of reducing core tube diameter and system size, greatly improving flexibility of the far end of the system, and reducing vascular injury caused by the system during the delivery process.

The invention provides a pipeline leakage detection method based on pipeline pressure data. According to the method, firstly, the resistance factor of each part of pipeline is calculated according to the pipeline pipe diameter, the roughness degree, the medium density and the local resistance of parts such as elbows in the pipeline; then, the pressure drop of each part is worked out according to the initial flow rate, and the pressure value of each detection point is calculated through being combined with the pressure of the initial end; finally, a theoretical value is subjected to comparison analysis with the actual measured value, so that the pipeline leakage condition is obtained, and the position of a leakage point is positioned. The method provided by the invention has the advantages that the factors, such as the pipe diameter, the roughness degree and the local resistance of various components, for reflecting the concrete conditions of the pipeline in the whole pipeline are fully considered, whether the existing pipeline leaks or not can be effectively judged, and the prediction precision is higher.

The invention provides an automatic paint spraying device of an inner wall used for low viscosity paint spraying. The automatic paint spraying device comprises a spraying car (3), a funicle cable (4), a spraying car guiding unwheeling (5) and an electrical controlled cabinet (6). The spraying car (3) is operated in a metal circular tube product (1). The spraying car (3) is composed of an underpan, a walking driving system, a paint spraying system, a pneumatic control system and a protecting cover. The spraying car (3) is controlled by the walking driving system to walk along the forward direction and the backward direction of the spraying car guiding unwheeling (5). Automatic open and close of a spray gun by the paint spraying system is achieved through the pneumatic control system, and therefore the automatic paint spraying to the inner wall of the metal tube (1) is achieved. Paint supplying, open and close of the spray gun and adjustment of spray range of a fan face are achieved by the pneumatic control system. The blank space of the field of automatic spraying of a circular tube inner wall with big tube diameter by using low viscosity paint is domestically filled. Thickness of paint surface of sprayed low viscosity paint is even, quality is stable, and process automation of inner wall spraying by using low viscosity paint is achieved.

The invention relates to a positive electrode and positive electrode paste with high energy density, and a battery containing the positive electrode, in particular to the positive electrode paste with high energy density, belonging to the technical field of batteries. The positive electrode paste with high energy density comprises the following constituents based on weight: 100 parts of positive active substance, 0.01-0.1 part of composite conductive agent, 0.4-3.0 parts of adhesive and 30-50 parts of solvent, wherein the composite conductive agent comprises a single-walled carbon nanotube and graphene, the mass ratio of the single-walled carbon nanotube to the graphene is (0.1-10):1, the specific surface area of the single-walled carbon nanotube is 500-700 m<2>/g, the tube diameter is 0.7-1.8 nanometers, the tube length is more than 5 micrometers, and the specific surface area of the graphene is over 2,000 m<2>/g. Compared with the prior art, the positive electrode paste has the advantages that by adjusting the formula and the dosage of the conductive agent, the energy density can be effectively improved, and the cost is relatively low.