30results about How to "Reduce alternating stress" patented technology

The invention discloses a directional rotating guide drilling tool. The directional rotating guide drilling tool comprises an outer barrel upper section and an outer barrel, wherein a drill stem and a mandrel are sequentially connected to the outer barrel upper section and the outer barrel from the top to the bottom, the drill stem is connected with the mandrel through a hollow cardan joint, the drill stem is in rotating connection with the outer barrel upper section through a cylindrical roller bearing, a pressure relief cavity positioned in the outer barrel is arranged at the lower end part of the drill stem, the pressure relief cavity is communicated with a draining hole in the drill stem, a biasing mechanism and a knuckle bearing assembly which are positioned in the outer barrel are respectively arranged at the upper end part and the middle of the mandrel, the pressure relief cavity is communicated with the biasing mechanism through a guide pipe, and a drill bit is fixedly connected to the lower end of the mandrel. The biasing of the mandrel is realized by an integrated hydraulic cylinder. The use of the tool is not affected by geological stratification, so that stable and higher drift angle buildup can be obtained. Various work states can be realized without lifting the drill.

The invention discloses an anti-surge ring mechanism of a cooling fan of a control rod drive mechanism. An annular groove is formed outside an anti-surge ring, a plurality of flow deflectors are evenly arranged in the annular groove in the peripheral direction, and flow guide rings are arranged on the inner sides of the flow deflectors. The anti-surge ring is arranged on an air duct of the cooling fan, the air duct is fixed through a support, and a movable vane, a hub, a guide vane, an inner machine box, a drive fan and a diffusion tail cone are arranged inside the air duct. An air outlet in the upper end of the air duct is connected with an air outlet taper pipe, and an air valve is arranged inside the air outlet taper pipe. The anti-surge ring mechanism of the cooling fan of the control rod drive mechanism has the advantages of being simple and novel in structure, and capable of ensuring that the fan can still operate smoothly under small flow.

The invention relates to a battery monomer, a battery, an electric device, a manufacturing method and manufacturing equipment. The battery monomer includes: a shell having a wall portion; and a pressure relief mechanism which is arranged on the wall part and comprises a main body part and a weak part connected to the main body part, wherein the main body part is used for being connected with the wall part, and the pressure relief mechanism is used for damaging the weak part to relieve pressure when the internal pressure or temperature of the battery monomer single battery reaches a threshold value, the pressure relief mechanism further comprises a reinforcing part arranged on the main body part in the thickness direction of the main body part, the reinforcing part is used for reducing deformation of the main body part, and the reinforcing part protrudes out of the surface of the main body part in the thickness direction. The battery monomer provided by the invention aims to solve the problem of explosion pressure relief when the single monomer is not subjected to thermal runaway.

The invention relates to a wind driven generator and a fan main shaft thereof. The wind driven generator comprises a fan wheel hub, a gearbox, and the fan main shaft in transmission connection between the fan wheel hub and the gearbox, wherein the fan main shaft comprises a main shaft body, and a connecting flange and a bearing mounting ring table arranged at interval from front to back; the main shaft body comprises a front body part and a back body part separated in the front-back direction and inserted together; the front and back body parts are fixedly connected through a fixed structure; the connecting flange is arranged on the front body part; and the bearing mounting ring table is arranged on the back body part. The invention provides the fan main shaft easy to be produced, and the wind driven generator using the fan main shaft.

A sand-based flat membrane-bioreactor mainly comprises a bio-reaction cell, a membrane filter cell, a biological air-blowing flowmeter, a biological air-blowing pipe, a membrane air-blowing flowmeter, a membrane air-blowing pipe, an n-shaped circulating pipe, a sand-based flat membrane component, a suction pump, a partition wall, a purified water flowmeter, an air pump, a sand-based flat membraneelement, and a membrane bracket. Based on the well-known water permeable brick technology, the invention is prepared by the following steps: coating an organic membrane material to obtain a long-lifemembrane element - sand-based flat membrane element, forming a sand-based flat membrane component by the membrane element, and forming a sand-based flat membrane-bioreactor by the sand-based flat membrane component. The invention solves and overcomes the problems of a short service life due to the adoption of an organic membrane, and high cost, high running energy consumption and high running expense due to the adoption of an inorganic ceramic membrane for well-known membrane bioreactors. The membrane bioreactor becomes a technique for water treatment, sewage treatment, and sewage regeneration and recycle, which is more practical, and is suitable for popularization and large-scale utilization.

The invention provides a tube core of a tube bundle dryer with an intermediate tubular shaft, belonging to the mechanical equipment technical field. The tube core comprises seal heads, a tube sheet, a support plate, fixed shovel angle steel, a heat exchange tube, a steam inlet shaft and a steam outlet shaft, wherein, the steam inlet shaft and the steam outlet shaft are welded on the seal heads at two ends respectively and in steam communication with the heat exchange tube through the tube sheet; a central tubular shaft passes through the support plate and two ends of the shaft are respectively welded on the tube sheet; and the shaft heads of the steam inlet shaft and the steam outlet shaft are respectively inserted into the central tubular shaft and welded with the central tubular shaft into a whole. In the invention, by adding the central tubular shaft, the gravity applied to the middle part of the heat exchange tube is transferred onto the intermediate tubular shaft through the support plate, thus effectively reducing the drooping distance of the middle part of the heat exchange tube, reducing the alternating stress applied to the heat exchange tube during the rotation process of the tube core, and prolonging the service life of the tube bundle dryer.

The invention discloses an intercooler. The intercooler comprises a first tube plate, a second tube plate, a heat exchange tube, fins and side plates. The second tube plate and the first tube plate are arranged in parallel at intervals; the heat exchange tube is arranged between the first tube plate and the second tube plate and used for forming a first cooling channel; the fins are arranged on the heat exchange tube in a sleeving mode; a pressurized air channel is formed between the fins and the heat exchange tube; the side plates are arranged on the two sides of the intercooler and connectedwith the first tube plate and the second tube plate; and second cooling channels are formed in the side plates. According to the intercooler, the side plates can be cooled, the temperature change amplitude of the side plates is effectively reduced, then alternating stress generated by the temperature change of the side plates is reduced, fatigue damage of the side plates is relieved, the sealingeffect of the intercooler can be improved, the service life of the intercooler is prolonged, the adaptability of the intercooler to the variable working conditions of a diesel engine is improved, andthe working reliability and safety of a whole pressurization system are improved.

The invention discloses a shielding tail cover. The shielding tail cover comprises a bolt, a tail cover shell, a set screw, a tail clamp and a threaded sleeve. The structure of the tail cover shell, the tail clamp and the threaded sleeve is adopted; the shielding tail cover can be used for connecting a shielding layer of a cable, and can also be used for connecting an additional shielding layer ofthe cable. The shielding layer is fixedly connected through a corrugated surface by adopting the tail cover shell and the tail clamp, so the problem of unified external shielding of a plurality of cables is solved; and the tail cover shell is fixedly connected with the tail end of a connector, so external force borne by the cable is transmitted to the tail cover shell through the shielding layerand then transmitted to the connector through the tail cover shell, stress of a connection point of the cable and the terminal is relieved and eliminated, alternating stress borne by the cable at thetail end of the connector is buffered. The shielding tail cover has the advantages of being simple in structure, convenient to use, reliable in connection and good in shielding effect.

The invention discloses a cable binding structure and a robot. The cable binding structure comprises a rotating assembly and a cable passing sleeve. The rotating assembly is provided with a via hole.The cable passing sleeve comprises a sleeve part and a cable binding column, the sleeve part is rotatably arranged in the via hole in a penetrating mode, the cable binding column is arranged at one end of the sleeve part, and the sleeve part is provided with a cable passing hole for a cable to penetrate through so that the cable can be fixedly connected with the cable binding column. According tothe cable binding structure, the cable is prevented from being bent or twisted, and the working stability of the robot is improved.

The invention relates to the technical field of transportation, in particular to a pipe air pressure regulating device. The pipe air pressure regulating device comprises a pipe and at least one air pressure regulating assembly arranged outside the pipe. The pipe is provided with an inner cavity used for transportation of means of transport. Each air pressure regulating assembly comprises a breather pipe, air inlets and air outlets of the breather pipes communicate with the inner cavity of the pipe, and the breather pipes are used for adjusting the air pressure difference between the front portion and rear portion of the means of transport. The pipe air pressure regulating device reduces the air pressure difference between the front portion and the back portion of the means of transport inthe process of driving in the pipe and reduces the travel resistance of the means of transport; and at the same time, the symmetrical stress caused by the pressure difference between the front portionand the back portion of the means of transport to the pipe wall is reduced, and the pipe is protected. The pipe air pressure regulating device can continuously squeeze the residual air in the pipe out of the pipe through the driving of the means of transport, so that the driving resistance of the means of transport is as low as possible.

The invention discloses a high water head water pump turbine rotating wheel double sealing pressure decreasing structure. The maximum diameter position of a rotating wheel upper crown (20) in the radial direction is provided with an upper crown outer leakage stopping ring (6); the maximum diameter position of a lower ring (9) in the radial direction is provided with a lower ring outer leakage stopping ring (3); the upper crown outer leakage stopping ring (6) and the lower ring outer leakage stopping ring (3) are equal in damping; the minimum diameter position of the portion, on the low pressure side of a rotating wheel, of the lower ring (9) is provided with a lower ring inner leakage stopping ring (1); damping at the position of the lower ring inner leakage stopping ring (1) is smaller than that at the position of the lower ring outer leakage stopping ring (3); the diameter positions of the rotating wheel upper crown (20) and the lower ring inner leakage stopping ring (1) are providedwith an upper crown inner leakage stopping ring (4); and the upper crown outer leakage stopping ring (6) and the lower ring outer leakage stopping ring (3) are the same in diameter. The high water head water pump turbine rotating wheel double sealing pressure decreasing structure achieves the purpose of lowering the water pressure between the rotating wheel upper crown and a top cover, and therefore the purpose that the theoretical pressure between the rotating wheel upper crown and the top cover is within a reasonable range is fundamentally guaranteed.

The invention discloses a centrifugal pump with double-layer guide vane blades. The centrifugal pump is mainly composed of an impeller, a guide vane and a volute from inside to outside; the guide vaneinternally comprises a plurality of sets of double-layer guide vane blades; each set of the double-layer guide vane blades is composed of two layers of guide vane blades arranged in parallel, one layer of the guide vane blades is affixed to a front cover plate of the guide vane, and the other layer of the guide vane blades is affixed to a rear cover plate of the guide vane; and a preset gap is left between the two layers of the guide vane blades, and the optimum width of the gap is 0.4-0.6 time the width of a guide vane flow pass. According to the centrifugal pump with the double-layer guidevane blades, the structure is simple and easy to realize, not only can the pressure recovery coefficient of fluid be increased, but also the radial force acting on the impeller can be reduced and theservice life of the centrifugal pump can be prolonged.