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

Arrangement structure of all levels of superheaters of circulating fluidized bed boiler

The invention relates to an arrangement structure of all levels of superheaters of a circulating fluidized bed boiler. The arrangement structure comprises a coal economizer, a steam pocket, a hearth water cooled wall, and a plurality of tail-cladding superheaters, low-temperature superheaters and high-temperature superheaters, wherein the coal economizer is arranged in a convection flue on the tail part of the boiler; the steam pocket is connected with the coal economizer through a pipeline; the hearth water cooled wall is connected with the steam pocket through a pipeline; the plurality of the tail-cladding superheaters, the low-temperature superheaters and the high-temperature superheaters are connected with one another through pipelines to form a closed loop; the high-temperature superheaters are arranged in the hearth of the boiler; and the heat absorption capacity of the high-temperature superheaters is in an amount of 48 to 58 percent based on the heat absorption capacity of an overall superheater system. By using the arrangement structure, the steam temperature and wall temperature properties of all levels of the superheaters of the boiler under various loads are greatly improved; the operating safety of the boiler is improved; and the service life of the boiler is prolonged.
Owner:SHANGHAI BOILER WORKS

High-temperature high-pressure pressure-reducing valve

The invention discloses a high temperature high pressure reducing valve, comprising a lever, an upper valve cover, a valve stem, a valve body, a valve seat and a lower valve cover. The top of the valve body is connected with the upper valve cover. The bottom of the valve body is equipped with a lower valve cover. The upper part of the inner cavity of the valve body is a high-pressure admission chamber communicated with the inlet. The lower part of the valve body inner cavity is a low pressure steam chamber communicated with the outlet. A valve seat is arranged on the circulation channel between the high-pressure admission chamber and the low pressure steam chamber. A flap matched with the valve seat is arranged inside. The cross section of the flap is a streamlined structure. When the valve stem moves up and down, the valve seat and flap form a streamlined steam flow path. One end of the flap is connected with one end of the valve stem and the other end of the valve stem is connected with the level. The invention adopts single seat plunger and porous throttling cover two stage pressure reducing structure, reduces the valve leakage rate, increases pressure reducing amplitude and simultaneously the porous throttling cover can reduce noises.
Owner:HANGZHOU WORLDWISE VALVE

Slow-down cam euphroe

The invention discloses a slow-down euphroe. A load-bearing rope passes through a fixed pulley and one end of a rope clamp to be connected with a rope fall. A connecting rod is connected with the rope fall. A rope tightening rod is articulated with the rope fall, the end part of the rope tightening rod is articulated with the rope clamp, and a cam is arranged on the end part of the rope tightening rod. Due to the rope tightening rod, the braking of the load-bearing rope is realized by a dead point of the cam at the end part of the rope tightening rod. The cam on the end part of the rope tightening rod is positioned on the dead point by the rope fall under the influence of gravity in an un-operating state, thus the rope tightening rod can be slowed down by uplifting the rope tightening rod, and the safety coefficient is high. The operation of rope tightening rod utilizes the leverage theory so that the operation saves labor. The load-bearing rope is fixed in the high place through the fixed pulley and is convenient to use and is very practical in a place where a rapid withdrawal is required. The bending points of the load-bearing rope in the rope clamp are few, thus the alternating stress can be reduced, and the load-bearing rope will not be easily broken. A damping wheel is arranged in the rope clamp to make the process of slowing down be smoother.
Owner:宜昌三大机械厂

Directional rotating guide drilling tool

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.
Owner:TIANJIN UNIV

Anti-surge ring mechanism of cooling fan of control rod drive mechanism

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.
Owner:NANTONG DART POLLRICH FAN

Pointing Rotary Steering Drilling Tools

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.
Owner:TIANJIN UNIV

Battery monomer, battery, electric device, manufacturing method and manufacturing equipment

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.
Owner:JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED

Wind driven generator and fan main shaft thereof

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.
Owner:STATE GRID CORP OF CHINA +2

Electric spindle structure suitable for longhole inner circle processing

The invention relates to an electric spindle structure suitable for longhole inner circle processing. The electric spindle structure comprises a motor shell (13), a motor rotor (9), a motor stator (8), a motor spindle (7), and a motor front bearing (6) and a motor front bearing seat (12) which are used for supporting the motor spindle (7), a motor rear bearing (10) and a motor rear bearing seat (11), a grinding spindle shell (3), a grinding spindle (2), a grinding wheel front bearing (1) and a grinding wheel rear bearing (2) which are used for supporting the grinding spindle (2), and a coupler (5) which is connected with the grinding spindle (2) and the motor spindle (7); and the electric spindle structure is characterized in that: the motor stator (8) is arranged in the motor shell (13);and the motor spindle (7) is arranged at the axial line position in the motor shell (3). The processing accuracy and assembly accuracy of the spindle structure can be guaranteed.
Owner:SOUTHEAST UNIV

Anti-fatigue multilayer steel smooth sucker rod and processing process thereof

An anti-fatigue multilayer steel smooth sucker rod comprises an upsetting end, a rod body and a closed end. The rod body is positioned between the upsetting end and the closed end and comprises a solid steel mandrel and a tubular outer layer, the tubular outer layer at least comprises a first outer layer and a second outer layer, and the tubular outer layer is formed by arc steel strips. A coatingconcept is introduced to the steel smooth sucker rod without a coating, and bending resistance and fatigue resistance of the smooth sucker rod are remarkably improved by the multilayer tubular shelland sheeted structure. By a progressive structure of mechanical performance indexes including strength, plasticity and the like, high adaptability to deformation characteristics of the smooth sucker rod under complicated alternating stress is realized, complicated stress conditions of the smooth sucker rod are well met, and oilfield application and popularization are benefited.
Owner:BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY

Sand-based flat membrane-bioreactor

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.
Owner:RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI

Tube core of tube bundle dryer with intermediate tubular shaft

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.
Owner:江苏格兰特干燥浓缩设备有限公司

A mechanical energy-absorbing vehicle-mounted fuel tank

ActiveCN107031387BReduced shakingAvoid damageFuel supplyFuel tankMechanical energy
The invention discloses a mechanical energy-absorbing type vehicle-mounted fuel tank in the automobile field. A left end piston and a right end piston which are sealed and slidably connected with the inner surface are arranged inside a fuel tank body, the right middle of the right end piston is fixedly connected with the left end of a right push rod, and the right end of the right push rod is fixedly connected with a right push rod base; the right middle of the left end piston is fixedly connected with the right end of a left push rod, and the left end of the left push rod is fixedly connected with a left push rod base; a left end spring is connected between a left cover and the left end piston, and a right end spring is connected between a right cover and the right end piston; and an active lever is arranged on the right side of the right push rod base, the upper end of the active lever faces to the right push rod base, the lower end of the active lever is connected with the right end of the horizontal section of an L-shaped force transferring rod, the upper end of the vertical section of the force transferring rod is fixedly connected with the left push rod base, when the shaking kinetic energy of oil plants is beyond the storage energy of the left end spring and the right end spring, the right push rod base strikes the upper end of the active rod, and the vessel volume for containing the oil plants is increased, so that the oil plants are in a rebalanced state.
Owner:QINGDAO ZHONGYI AUTO PARTS

Intercooler

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.
Owner:NO 711 RES INST CHINA SHIPPING HEAVY IND GRP

Shielding tail cover

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.
Owner:SUZHOU HUAZHAN SPACE APPLIANCE

Cable binding structure and robot

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.
Owner:SHENZHEN INOVANCE TECH

Sand-based flat membrane-bioreactor

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.
Owner:RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI

A molten salt constant temperature system and its application method

ActiveCN112985139BLow costGuaranteed molten salt temperature fluctuationsHeat storage plantsHeat exchange apparatusTemperature controlMolten salt
The invention provides a molten salt constant temperature system and its use method, comprising a molten salt tank, a constant temperature working salt tank and a water heat exchange system, the constant temperature working salt tank is provided with a salt-salt heat exchanger, the outlet of the molten salt tank is connected The heat exchange system is connected, the outlet of the water heat exchange system is connected with the salt-salt heat exchanger, and the outlet of the salt-salt heat exchanger is connected with the molten salt tank. The invention utilizes the low-temperature molten salt to take away the heat of the high-temperature molten salt in the working salt tank, and converts the excess heat into high-temperature steam, thereby achieving the purpose of constant temperature control of the working molten salt, ensuring that the temperature fluctuation of the molten salt is between ±2°C, and at the same time Realized waste heat recovery and utilization. The invention is safe, reliable, simple in structure, stable in performance, energy-saving, environment-friendly and low in cost. By installing a pre-heater between the water supply device and the steam drum, the temperature of the water entering the steam drum can be increased to ensure the good operation of the evaporator; at the same time, it can effectively reduce the fluctuation of the water level in the steam drum, reduce the temperature difference between the upper and lower walls of the steam drum, and reduce the exchange of metals. Variable stress, improve equipment life.
Owner:QINGDAO SPECIAL STEEL CO LTD

Single Metal Composite Sealing Structure for Roller Bits

The invention relates to a monometallic compound seal structure for a roller bit. The monometallic compound seal structure for the roller bit is widely used in rotating dynamic seal of oil and gas andmining downhole power tools to prevent oil leakage inside a bearing and prevent external mud from entering the bearing. The monometallic compound seal structure for the roller bit is mainly composedof a dynamic seal ring, a static seal ring, an X type rubber sealing ring, a support ring and a palm shaft journal. According to the technical scheme, the outer end part of a cone inner hole in whichthe dynamic seal ring is located and the root portion of the palm shaft journal constitute a seal cavity, and a monometallic compound seal device formed by the dynamic seal ring, the static seal ring,the X type rubber sealing ring and the support ring is placed into the seal cavity; the dynamic seal ring is in interference fit with the cone inner hole, and the contact face of the dynamic seal ring and the static seal ring is a sealing face; and the X type rubber sealing ring is compressed inside the support ring by the static seal ring. The monometallic compound seal structure for the rollerbit improves the monometallic seal structure, increases the seal reliability, increases the heat dissipation area, improves the wear resistance and prolongs service life.
Owner:SOUTHWEST PETROLEUM UNIV

Pipe air pressure regulating device

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.
Owner:SHANGHAI HUAPU AUTOMOBILE CO LTD +1

High water head water pump turbine rotating wheel double sealing pressure decreasing structure

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.
Owner:HARBIN ELECTRIC MASCH CO LTD +1

Centrifugal pump with double-layer guide vane blades

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.
Owner:XI AN JIAOTONG UNIV
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