32results about How to "Avoid partial failure" patented technology

The invention discloses a method and a system for evaluating structural performance of a high-temperature valve based on a valve simulation model. The method comprises the following steps of establishing a three-dimensional geometrical model of the valve with the center of a runner of a valve body as an origin; applying finite element analysis software to carry out grid processing on the three-dimensional geometrical model of the valve; carrying out analog computation on a temperature field of the valve, which changes with the temperature, and a hot stress field which bears temperature load based on the three-dimensional geometrical model of the valve; and computing total hot stress and local heat stress when a valve bearing component bears a combined action of the temperature load and the mechanical load, and evaluating the structural performance condition of the valve according to a hot stress computation result and reference to the specified strength design standard of the high-temperature valve structure. According to the method and the system, valve design parameters needed by the high-quality valve with reasonable structural design and reliable structural strength is obtained through modeling calculation, so that the safety for running of a nuclear power plant is improved, the experimental manufacturing cost of a model machine is reduced, and the valve product development cycle is shortened.

The invention relates to a high efficiency torsion resistant drill rod joint with good sealing performance. The drill rod joint consists of an externally threaded part and an internally threaded part, wherein the internally threaded part contains an outer shoulder surface, a long and straight cylindrical bore, an internal thread, a conical bore, a cylindrical bore, a semicircular convex and an inner shoulder surface; and the externally threaded part contains a first outer shoulder surface, a stress-relief groove, a long and straight cylindrical bore, an external thread, a cylndrical surface and a second outer shoulder surface. The total torsional strength of the joint depends on the distance between the combination part of the shoulder surface and the long and straight cylindrical bore in the internally threaded part and the combination part of the cylndrical surface and the shoulder surface in the externally threaded part. After the internal thread and the external thread are meshed, the effect of reducing the maximum stress can be well realized. The drill rod joint has good connection strength and sealing performance and superior torsion resistance ability; the maximum stress and the stress distribution of the drill rod joint can be effectively improved; and the drill rod joint is particularly suitable for the extraction of petroleum and natural gas.

The invention discloses a degradable magnesium alloy material composed of multiple components as well as a preparation method and application thereof. The magnesium alloy material is formed by stacking a plurality of magnesium alloy layers with different component differences, wherein the component difference is that the adding elements in the magnesium alloy are different or the adding elements are the same, but the adding concentration is different. The preparation method comprises the following steps of (1) determining the type of required components, and placing the pure metal powder in different powder bins of a laser melting printer; (2) controlling the powder feeding amount of the pure metal powder of each element, and fully and mechanically mixing and then feeding the powder into apowder supply groove; and (3) carrying out melting and layered printing on the powder supplying laser in the powder supply groove to obtain the degradable magnesium alloy material with the corresponding shape and size and multiple components. The material is used as a medical implantable material to prepare bone repair or support materials. According to the degradable magnesium alloy material, mutual matching among the mechanical property, the degradation rate and the functionalization of the material is realized, and the requirements of the service environment of the biological material on the mechanical property, the degradation rate and the functionalization of the magnesium alloy are met.

The invention relates to a constant cooling device for a vehicle and a cooling system. The constant cooling device comprises a constant cooling device housing, a constant cooling device base, a radiator exhaust water pipe connector, an engine exhaust water pipe connector, a relief valve, an expansion water pipe connector, an internal core body and a sensor assembly, wherein the radiator exhaust water pipe connector, the engine exhaust water pipe connector, the relief valve and the expansion water pipe connector are arranged on the constant cooling device base. The constant cooling device for the vehicle is added between an expansion water tank and a radiator, the internal core body is used for adsorbing iron rust, water scale and bubbles produced during working of the cooling system through primary physical absorption and isolation and secondary and tertiary chemical actions, calcium and magnesium ions, ferric ions, acidic ions and other potential threats are treated through a reaction, the constant PH value of a coolant is maintained, clean and safe cooling liquids are output for the system, safe, lasting and efficient operation of the cooling system is ensured, the fault rate of the finished vehicle is greatly reduced, and the vehicle use cost of a user is greatly reduced.

The invention discloses a flat double P type radiant tube which comprises a first straight tube, a three-way tube, a second straight tube, a third straight tube, a first bent tube and a second bent tube. A burner is fixed into a first straight tube mounting pipe, a central spray tube is a gas jet, four spray tubes on the outer side are air jets, the sections of all the spray tubes are elliptic, the proportion of a long edge and a short long edge of an ellipse is as same as that of a long edge and a short long edge of the section of a radiant tube body, and the first straight tube and the three-way tube are thickened. The flat double P type radiant tube has the advantages that the thickened first straight tube can effectively prevent tube wall failure caused by high-temperature corrosion, the thickened three-way tube can prevent bent tube deformation caused by heat stress, and the section of the radiant tube body is elliptic. Compared with a circular radiant tube consuming the same alloy steel, the effective radiant area of the radiant tube for a workpiece is enlarged, and the heat exchange amount of the radiant tube and the workpiece within unit time is increased. Burning flame diffuses towards two sides of the radiant tube, the radiant temperature of two side wall surfaces of the radiant tube is increased, and the temperature of the radiant tube is uniformly distributed.

The invention relates to a vehicle-used cooling thermostat and a cooling system. The vehicle-used cooling thermostat comprises a cooling thermostat housing, a radiator exhaust water pipe connector, an engine exhaust water pipe connector, a pressure relief valve, an expansion water pipe connector, a built-in core and a sensor assembly, wherein the radiator exhaust water pipe connector and the engine exhaust water pipe connector are both arranged on the small-diameter end surface of the thermostat housing; and the pressure relief valve and the expansion water pipe connector are both arranged on the large-diameter end surface of the thermostat housing. The vehicle-used cooling thermostat is added between an expansion kettle and a radiator, and under primary physical absorption and isolation and secondary and three-stage chemical actions and by use of the built-in core, rust, scale and bubbles, generated during operation of the cooling system, are absorbed, and potential threats, such as calcium and magnesium ions, iron ions and acid ions, are subjected to reaction processing, so that the pH value of a coolant is kept constant, and the clean and safe coolant is output to the cooling system; and therefore, safe, enduring and efficient running of the cooling system is guaranteed, and the failure rate of the whole vehicle and the vehicle use cost of users are greatly reduced.

The invention relates to an automotive cooling constant device and a cooling system. The automotive cooling constant device comprises a cooling constant device shell, a radiator exhaust water pipe connector, an engine exhaust water pipe connector, a pressure relief valve, an expansion water pipe connector, a built-in core and a sensor assembly. Both the radiator exhaust water pipe connector and the engine exhaust water pipe connector are arranged on the small-diameter end face of the constant device shell. Both the pressure relief valve and the expansion water pipe connector are arranged on the large-diameter end face of the constant device shell. The automotive cooling constant device is additionally arranged between an expansion water bottle and a radiator, the built-in core is adopted, rust, limescale and bubbles generated during working of the cooling system are absorbed through first-level physical absorption and separation as well as second-level and third-level chemical action, potential threats such as calcium and magnesium ions, iron ions and acid ions are processed in a reacting mode, the PH value of cooling liquid is kept constant, the clean and safe cooling liquid is output to the system, and therefore safe, long-time and efficient operation of the cooling system is ensured, and the fault rate of a whole automobile and the automobile using cost for users are greatly reduced.

The invention relates to an expansion tank and a processing method. The expansion tank comprises an expansion tank shell. The interior of the expansion tank shell is divided by a separating plate into a first chamber and a second chamber. A filling opening, a pressure cover, a radiator exhaust water pipe connector, an engine exhaust water pipe connector, an engine water supplement pipe connector, a pressure relief guide pipe, an exhaust guide pipe and an internal core body are arranged on the expansion tank shell. According to the technical scheme, the two chambers and the internal core body in the expansion tank shell absorb rust, water scale and bubbles generated in the working process of a cooling system and conducts reaction treatment on potential threats such as calcium ions, magnesium ions, iron ions and acidic ions through first-level physical absorption and isolation, the second-level chemical action and the third-level chemical action, the PH value of cooling fluid is kept constant, clean and safe cooling fluid is conveyed to the system, and therefore the situation that the cooling system works in a safe, lasting and efficient state is ensured, and the failure rate of a finished automobile and the automobile usage cost are greatly reduced.

The invention discloses a positioning device of an ultralarge excavator track pin shaft. The positioning device comprises a pin shaft for connecting with a track plate, and a positioning device for positioning the pin shaft. The positioning device is characterized in that the positioning device is horizontally arranged at the outer side end part of the pin shaft; the positioning device comprises a transition piece, a limiting piece, and a fixed piece for connecting the limiting piece with the transition piece; a gap is formed between the limiting piece and the end surface of the pin shaft; the transition piece is provided with an arc surface matched with a track plate arc surface for preventing arrangement of a complicated mounting boss on a track plate and machining; and the fixed piece penetrates through the limiting piece and the transition piece for fixation in sequence. The positioning device has the following advantages: the positioning device uses a spacing sleeve with an arc surface as the transition piece for preventing arrangement of the complicated mounting boss on the track plate and machining to reduce the casting risk; the positioning device uses a drum-shaped sleeve for axially positioning the track pin shaft to prevent wear of such parts as the pin shaft; and the positioning device is simple in structure, convenient to disassemble and high in reliability.

The invention discloses a microcircuit switch safety lock, and belongs to the technical field of electricity utilization safety. The microcircuit switch safety lock comprises an operating rod, a coded lock, a shell, a spring and a V-shaped support; the spring and the V-shaped support are arranged in the shell, the tip end of the V-shaped support is connected with the operating rod, two branch ends of the V-shaped support extend out of the shell, locking supporting feet are arranged at the branch ends, and the locking supporting feet can be inserted into holes in a microcircuit switch and lock the micro circuit switch; part of the operating rod extends into the shell, and the other part of the operating rod penetrates through the coded lock and can be locked by the coded lock; the spring is sleeved on the operating rod, one end of the spring is fixedly connected with the operating rod, and the other end of the spring is fixedly connected with the shell; and an information label is arranged on the coded lock. According to the microcircuit switch safety lock, the microcircuit switch can be reliably locked, misoperation is prevented, and the problems of matching and management of a large number of locks and keys are solved.

The invention relates to an automobile cooling constant device and a cooling system. The automobile cooling constant device comprises a cooling constant device shell, a cooling constant device base, a heat dissipation device exhaust water pipe connector, an engine exhaust water pipe connector, a pressure release valve, an expansion water pipe connector and a built-in core. The heat dissipation device exhaust water pipe connector, the engine exhaust water pipe connector, the pressure release valve and the expansion water pipe connector are arranged on the cooling constant device base. By additionally arranging the automobile cooling constant device between an expansion water kettle and a heat dissipation device and absorbing rust, water scale and bubbles generated during working of the cooling system through the built-in core and treating calcium and magnesium ions, iron ions, acid ions and other potential menaces generated during working of the cooling system in a reaction manner through the built-in core under the first-level physical absorption and isolation action, the second-level chemical action and the third-level chemical action, the PH value of cooling liquid keeps constant, clean and safe cooling liquid is output for the system, and therefore it is ensured that the cooling system safely, durably and efficiently runs, and the failure rate of the whole vehicle is greatly reduced, and the automobile using cost is greatly reduced for a user.