41results about How to "Avoid corrosion risk" patented technology

The invention provides a urea crystallization amount estimation, crystalline state judging and crystal eliminating method. Based on the engine running working conditions, influences of the urea crystallization speed and the SCR conversion efficiency on urea crystallization are estimated under the current working condition. When the urea crystallization amount is too much, the engine running state is adjusted, crystals are removed in time, and the stone forming phenomenon is prevented.

A heat transfer tube (101) for a heat exchanger. The wall (120) of the heat transfer tube comprising at least one axially extending wing-shaped protrusion (104, 105) to provide the tube with additional heat transfer surface area. The wing shaped protrusion is formed by a process comprising at least one of: (i) folding the wall of the tube; and (ii) extrusion.

A composite structural reinforcement is realized within the pipe through in situ stratification of at least one band of reinforcement fibers and a resin matrix. The band is arranged according to a helicoidal path along the internal side of the pipe.

The invention discloses an aluminium alloy section and a manufacture method thereof. The aluminium alloy section comprises the following elementary components of 87.5 percent of Al, 0.4 percent of Si, 1.1 percent of Fe, 0.75 percent of Mn, 0.8 percent of Mg, 2.1 percent of Zn, 4.4 percent of Cu, 0.1 percent of Ni and 0.1 percent of Ti. The manufacture method of the aluminium alloy section comprises the following process steps of: (1) melting an aluminium material, and adding metal components including the Si, the Fe, the Cu, the Mn, the Mg, the Zn, the Ni and the Ti; (2) controlling high temperature for casting to form an aluminium-based solid solution; (3) carrying out purification treatment and modification to enable grains to be refined and reduced to 1/20 before treatment and enable the total content to be reduced by 30 percent to obtain antirust hard aluminium alloy; and (4) splicing and molding by adopting a mould to obtain the aluminium alloy section. The aluminium alloy section provided by the invention has favorable corrosion resistance and excellent mechanical strength and is superior to a general section for a common laboratory.

The invention belongs to the field of seawater desalination, and specifically discloses a wave-energy-based seawater desalination system. The system comprises a wave energy conversion device and a seawater desalination device, wherein the wave energy conversion device comprises a first buoy, a second buoy, a third buoy and a fourth buoy which are connected in sequence by transmission bearings, andfurther comprises four sets of supercharging units with the same structure; each set of the supercharging units comprises a piston, a piston cylinder and a hydraulic oil cylinder which are connectedin sequence; the bottom of each hydraulic oil cylinder is an elastic diaphragm; the seawater desalination device comprises four sets of seawater desalination units with the same structure; each set ofthe seawater desalination units is connected with the corresponding supercharging units; pressure applied by the supercharging units enables seawater to be filtered through a reverse osmosis membraneso as to obtain fresh water. According to the seawater desalination system disclosed by the invention, the structure and layout of the wave energy conversion device are optimized, so that the situation that the stretching and compression of the pistons occur in pairs during the change of the angular displacement of one buoy can be ensured, thereby greatly improving the ability to absorb and transform wave energy.

A compressor housing resistant to a titanium fire (burning titanium). A mixed housing is constructed, in which a structure holding stator blades includes a single-cast part made from titanium or titanium alloy, and at least one element forming a shield made from refractory alloy(s), and which is incombustible in presence of burning titanium, where each shield is secured to the single-cast part by fasteners. The fasteners are positioned with each shield so as to define jointly an inner wall demarcating an outer contour of the compressor airstream.

The invention discloses an anticorrosion surfacing interior joint coating method for a submarine pipeline. According to the technical scheme, the method comprises the steps that anticorrosion alloy with a certain width and thickness is surfaced on the inner walls of the two ends of a submarine pipeline steel pipe through an automatic tungsten inert-gas arc surfacing machine, and then anticorrosion and heat preservation treatment are conducted on the inner wall and the outer wall of the steel pipe (the step is shown as the Figure 1); during the submarine pipeline welding construction process, priming and transiting are conducted through argon welding wire filling-free inert gas shielded-arc welding, and by means of a metallurgy composite welding technique of diffusing, filling and covering of flux-cored self-shielded welding wires or manual arc welding electrodes, a continuous anticorrosion layer is formed on the inner wall of the pipeline (the step is shown as the Figure 2).

The invention relates to an anticorrosion hard aluminum alloy sectional material and a preparation process thereof. The anticorrosion hard aluminum alloy section material consists of the following elements by weight percent: 88.5 percent of Al, 0.7 percent of Si, 1.4 percent of Fe, 0.95 percent of Mn, 0.9 percent of Mg, 2.4 percent of Zn, 4.6 percent of Cu, 0.35 percent of Ni and 0.2 percent of Ti. The preparation process comprises the following steps: step S1: melting an aluminum material, and charging Si, Fe, Mn, Mg, Zn, Cu, Ni and Ti according to the ratio; step S2: controlling high-temperature casting, and forming aluminum-base solid solution; step S3: carrying out anode oxidation, purification and turning treatment, and refining crystal grains; step S4: splicing molding by adopting a mold. The anticorrosion hard aluminum alloy sectional material has good anticorrosion characteristics and excellent mechanical strength and is better than an ordinary universal sectional material for laboratory.

The invention discloses a black water coupling processing apparatus. The apparatus mainly comprises a solid-liquid separation unit used for removing solid particles from black water to form gray water and a gray water evaporation unit used for removing mineral matters from the gray water. The invention further discloses a black water coupling processing method, which comprises steps: 1) separating solid particles from black water through solid-liquid separation technology to form gray water; and 2) separating mineral matters from gray water through evaporation technology to obtain purified gray water. Solid-liquid separation technology and evaporation technology are well combined to be applied to process black water from a coal gasification apparatus. Compared with a common black water processing process, the method allows safety and stability of operation of a black water processing apparatus to be improved, the technical process to be simplified, area occupation and difficulties of arrangement, operation and maintenance of the apparatus to be reduced, and the cost for treating black water to be reduced.

The invention discloses UV moisture dual-curing silica gel, which comprises the following components in parts by weight: 60-100 parts of vinyl alkoxy terminated polydimethylsiloxane, 40-60 parts of sulfydryl terminated polydimethylsiloxane, 5-20 parts of a cross-linking agent, 5-30 parts of filler, 1-10 parts of a catalyst and 1-10 parts of a photoinitiator. The vinyl alkoxy-terminated polydimethylsiloxane is used as main resin and contains a vinyl group and an alkoxy group at the same time, and the vinyl group is used as a UV curing group and is subjected to a click chemical reaction with sulfydryl-terminated polydimethylsilane under the promotion of a photoinitiator, so that a cross-linked cured film is formed; wherein the alkoxy group is used as a moisture curing group and is subjected to cross-linking polymerization with a cross-linking agent under the action of a catalyst. Compared with the prior art, firstly, UV curing is carried out to achieve rapid primary curing, the problem that the initial curing speed is low is solved, secondly, the existence of acrylic acid substances in a traditional UV moisture curing adhesive is avoided, the problem that the acrylic acid substances corrode materials such as devices and circuit boards is solved, and the product can be widely applied to bonding and sealing of electronic devices.

The invention belongs to the technical field of surface treatment and in particular relates to a hard anodic oxidation pre-treatment technology applicable to protection of groove and blind hole parts.A flow of the hard anodic oxidation pre-treatment technology comprises the following steps: inspecting and accepting a workpiece; removing gasoline; insulating protection glue of the groove and blindhole parts; hanging; chemically removing oil; washing with hot water; washing with cold water; carrying out acid etching; washing with the cold water; washing with the cold water; carrying out hard oxidation; washing with the cold water; washing with the cold water; sealing; washing with the cold water; washing with the cold water; drying; detaching; drying; removing insulating glue; checking. According to the hard anodic oxidation pre-treatment technology provided by the invention, chemical oil removal and alkali etching procedures are not adopted so that corrosion risks are completely avoided; actual production proves that oxidation tint on the groove part of a product with a certain model can be avoided. By adopting the method, a condition that glue layers of the groove and blind holeparts are torn to fall off in a common partial hard anodic oxidation pre-treatment process so that the protection on the part becomes invalid can be avoided or a condition that alkali etching liquid is retained in a groove and a blind hole so that serious electrochemical corrosion on the part is caused can be avoided.

The invention discloses a shell-and-tube dry type evaporator. The shell-and-tube dry type evaporator comprises a distributor, arch-shaped baffle plates, heat exchange tubes and a barrel; one end of the barrel is closed, the other end of the barrel is open, the heat exchange tubes and the arch-shaped baffle plates are arranged in the barrel, the heat exchange tubes penetrate through the arch-shaped baffle plates, and a multi-stage distributor is arranged at the open end of the barrel; holes are formed in the top and the bottom of the barrel separately, a water side inlet pipe is mounted in the hole in the bottom, and a water side outlet pipe is mounted in the hole in the top; and a distribution channel is machined in the lower portion of an end cover and communicates with inlets of the heat exchange tubes, a convergence cavity is machined in the upper portion of the end cover and communicates with an outlet of a heat exchanger, and an outlet is formed in the convergence cavity. According to the shell-and-tube dry type evaporator, the distributor is simple in structure, can be machined through laser cutting, linear cutting and other machining methods, and is low in manufacturing cost and convenient to popularize and use on a large scale; and through the design and use of an inlet distributor and the arch-shaped baffle plates, the amount of heat exchange tubes is reduced by 30% or above.

The invention discloses a structure for reducing shaft voltage of a PWM inverter driving type plastic package motor, which relates to the field of motors. In the existing PWM inverter driving type plastic package motor, a high-frequency switch of a power element can cause change of common-mode voltage and parasitic capacitance at each position in the motor, so that a potential difference is generated between an inner ring and an outer ring of a bearing, an oil film of bearing lubricating grease is easily damaged, the bearing is damaged by electrocorrosion, and electrocorrosion generated by theinner ring, the outer ring and a ball is always a key factor influencing the service life of the motor. According to the structure disclosed in the invention, a front end cover and a rear end cover are connected through a conductive piece to realize equipotential, and a capacitor is connected between the conductive piece and a stator core. Effective conduction among the front end cover, the rearend cover and the stator iron core is conveniently realized, the equipotential is formed, the capacitor is arranged between the end cover and the stator core, a proper amount of capacitance is added,and finally, the external induction capacitance of the inner ring and the outer ring of the bearing is balanced, so that the shaft voltage is effectively reduced, the electrocorrosion risk of the bearing is avoided, the service life of the motor is prolonged, and the reliability is improved.

The invention discloses a shell-and-tube heat exchanger with a refrigerant distribution device. The shell-and-tube heat exchanger with the refrigerant distribution device comprises a refrigerant outlet pipe, a distribution structure, a tube plate and a barrel. A tube plate is arranged at one end of the barrel; a heat exchange tube and a plurality of segmental baffles are arranged in the barrel; the distribution structure is arranged at a refrigerant inlet at one end of the barrel and comprises a refrigerant distribution tube, a cover plate and an end cover; the refrigerant distribution tube is connected with the cover plate; the cover plate is connected with the end cover; and the end cover is connected with the tube plate. The refrigerant distribution pipe comprises a first-stage distribution pipe, a first-stage transverse pipe, a second-stage distribution pipe, a second-stage transverse pipe and a third-stage distribution pipe; the first-stage distribution pipe communicates with the first-stage transverse pipe; the first-stage transverse pipe communicates with the second-stage distribution pipe; the second-stage distribution pipe communicates with the second-stage transverse pipe; and the second-stage transverse pipe communicates with the third-stage distribution pipe. The shell-and-tube heat exchanger with the refrigerant distribution device has the advantages that the whole size of the shell-and-tube heat exchanger is close to that of an existing product, the matching degree with a system is high, and replacement is convenient. By arranging the inlet distribution structure and the segmental baffles, the amount of heat exchange tubes is reduced by more than 30%.

A bayonet type locking ring of a circular electrical connector. A first piece with the shape of a cylindrical ring extends from one end to the other. The first piece is made of thermoplastic material, and includes notches distributed over the internal face of the first piece adjacent to one end and a first ramp part on the internal face of the first piece. A second piece with the shape of a cylindrical ring, and includes notches distributed over its external face and a second ramp part on the internal cylindrical surface. The first piece and the second piece are assemblable such that the notches of the second piece fit in the notches of the first piece, and prevent the second piece from rotating in relation to the first piece. The second ramp part of the second piece complements the first ramp part of the first piece.