92results about How to "Reduce axial stress" patented technology

A fluid transfer system having improved stress accommodation properties and thermal insulation properties is provided. The fluid transfer system includes a fluid transfer conduit comprising a plurality of concentric tubes configured to divide and distribute an axial stress induced in the fluid transfer conduit to each of the tubes and a vacuum cavity between the fluid transfer conduit and a structural support of the fluid transfer system to insulate fluid from a surrounding environment.

The present invention is foam-generating composition for high temperature stratum and its application in exploiting thick oil, and belongs to the field of surfactant technology. Chemicals capable of producing N2, CO2 and other gas are adopted to produce gases through the reaction of A+B+C-->N2+NH3+CO2+C, where A is reductant, B oxidant and C foaming agent. The reaction is controlled by temperature, and the foam-generating composition contains also surfactant with high heat resistance, high salt tolerance, high oil/water interface activity and high foam stability. After the chemicals are injected into the stratum at normal temperature, steam is injected to initiate reaction producing stable foam in the stratum, and the foam can plug to avoid steam fleeing, raise high temperature steam sweep efficiency, raise blotter efficiency, promote crude oil to disperse and raise the thick oil exploiting rate greatly.

The invention provides a cobalt-chromium alloy artery stent with full-biodegradation medicine coating; the full-biodegradation coating of the stent has good stent flexibility, pathological change permeability and radial bearing force; the invention further provides a preparation method of the stent; multi-level coating applying technology, metallic support surface inert gas processing process and the like are adopted, the firmness of the stent surface coating, the toughness and tensile strength thereof are greatly improved, thereby being beneficial to keeping the integrity of the coating; in addition, the invention provides a cobalt-chromium alloy artery stent with full-biodegradation medicine coating, which is prepared by radial grading squeezing process, the damage of the coating can be avoided to the greatest extent, the retention force between the stent and a conveying system is greatly improved, the possibility that the stent is migrated in the conveying process is avoided, the clinical using risk is reduced, and the problems of coronary artery stenosis and restenosis are effectively solved.

A precast segment suitable for block-stacking concept is disclosed. The precast segment includes a first surface, an opposite second surface, plural through holes, and plural male-female connecting sets. The through holes extend from the first surface and toward the second surface to communicate between the first surface and the second surface. Each male-female connecting set includes a shear key and a joint hole, wherein the shear key protrudes from one of the first surface and the second surface to serve as a male connecting unit, and the joint hole is formed in the other of the first surface and the second surface to serve as a female connecting unit. Accordingly, the precast segments can be block-stacked by mortise-and-tenon joints to construct a bridge pier system. Compared to the conventional construction methodology, the present invention can enhance the efficiency of segment fabrication and avoid high prestress force.

The invention relates to a ground-anchored-self-anchored suspension combined system bridge which belongs to the technical field of constructional engineering and particularly relates to a design of a long-span bridge under a complex geologic condition in bridge engineering. The ground-anchored-self-anchored suspension combined system bridge is characterized in that after a tower and a lateral hole pier are constructed, a concrete main girder of a cable-stayed bridge begins to be assembled through a cantilever; after the cantilever is assembled to a lateral hole, a main cable is suspended, one end thereof is anchored on a permanent anchor block, the other end thereof is anchored on a concrete girder external anchor block, and the anchor blocks are pulled on a temporary anchor through temporary anchor cables; the end of a main girder provided with the permanent anchor block is horizontally supported on a bridge abutment; each segment of a main steel girder in a span is hoisted through a cable crane; after folding, the temporary anchor cables are dismantled in batches, and the main cable is completely anchored at the end part of the main girder to finish the system switching from the temporary anchor to a self-anchor. The invention has the effects and advantages that material performance is fully exerted, and by aiming at the complex geologic condition, the huge anchor is saved, the construction cost is lowered, the construction period is shortened, and the risk in the construction process is reduced.

The invention discloses a turbocharger. The turbocharger is characterized in that a compressor casing comprises a cylinder body and a flow channel casing fixed to the cylinder body, a gas conveying flow channel is formed in the flow channel casing, a gas conveying channel is formed in the cylinder body, the gas conveying channel comprises a main gas conveying channel, a bypass gas guide part, a first gas conveying opening and a second gas conveying opening, wherein the axial direction of the main gas conveying channel is parallel to the axial direction of a compressor impeller, the compressorimpeller is located in the main gas conveying channel, the bypass gas guide part is located around the main gas conveying channel and the gas compressor impeller, the first gas conveying opening and the second gas conveying opening are located in the two ends of the bypass gas guide part respectively, the second gas conveying opening communicates with the main gas conveying channel, and the gas outlet direction of the second gas conveying opening is not perpendicular to the radial direction of the gas compressor impeller; and when the turbocharger is in a normal working state, gas flow entering the bypass gas guide part from the first gas conveying opening enters the gas compressor impeller to be compressed after flowing out from the second gas conveying opening. The turbocharger has the advantages that the gas compression efficiency is improved, and surge of the turbocharger is avoided.

The invention relates to a twist drill with changeable helical angles, belonging to a metal cutting tool technology. The twist drill comprises a handle part and a working segment, wherein the working segment is provided with a double-helical groove divided into a front segment near a drill point and a rear segment near the handle part, the helical angle of the front segment is 35-38 DEG, the helical angle of the rear segment is 15-17 DEG, and the front segment and the rear segment are in smooth transition. The twist drill provided by the invention better gives consideration to cutting and chip removing processes, and has the advantages of long service life, stability in drilling and high drilling quality.

The invention relates to a friction stir butt welding device for a large-thickness titanium-nickel dissimilar material and a machining method of the friction stir butt welding device. The friction stir butt welding device comprises a workbench and a friction stir welding mechanism, the workbench comprises a fixed clamping device, the friction stir welding mechanism comprises friction stir weldingequipment, the output end of the friction stir welding equipment comprises a stirring head, and a gas protection mechanism is arranged at the stirring head; the friction stir butt welding device further comprises a laser output mechanism, the laser output mechanism comprises a plurality of second laser output mechanisms arranged on the upper portion of the gas protection mechanism; and a hollow placement groove is formed in the stirring head. By arranging the laser output mechanism, the gas protection mechanism or a current heating mechanism in the stirring head of conventional friction stir butt welding equipment, the problem of insufficient softening of the bottom of a to-be-welded area only during surface laser heating is solved, and the axial pressure of the stirring head in the welding process can be greatly reduced.

The invention discloses a separate multi-piece type clutch assembly. The separate multi-piece type clutch assembly is provided with a spline assembly seat and a thrust limiting spiral cam which sleeve a spindle; a plurality of external tooth friction plates and internal tooth lining plates are arranged on the outer side of the spline assembly seat in an alternately overlapped manner; one end of the trust limiting spiral cam is connected with the spline assembly seat while the other end of the thrust limiting spiral cam is provided with a cam; disc springs which press the external tooth friction plates and the internal tooth lining plates on the spline assembly seat are arranged on one side, which is away from the thrust limiting spiral cam, of the spline assembly seat; and a torque adjusting nut is further arranged at the outer end of each disc spring and is used for adjusting the pressing force of the disc spring. The separate multi-piece type clutch assembly has the advantages of simple structure, speedy assembly, easiness in machining, capability of increasing friction area infinitely, good joint surface, high separation speed, zero impact, stable torque force value and the like; axial infinite pressure boosting is limited effectively; and damage of bearings on the spindle is avoided. To sum up, by the separate multi-piece type clutch assembly, axial pressure is reduced, so that switching of driving climbing machines is stable, and sensitivity is relatively high.

The invention relates to the field of sealing, in particularly to a rubber sleeve which can bear high temperature and high pressure and comprises a metal wire sealing ring, a packer and a bridge plug used in the oil exploitation industry. The rubber sleeve comprises the metal wire sealing ring and a fiber wire sealing ring, wherein the metal wire sealing ring and the fiber wire sealing ring abut against each other and are arranged on the lower portion. The metal wire sealing ring comprises a plurality of mutually intersecting metal wires and glue bonding the metal wires together. The fiber wire sealing ring comprises a plurality of fiber wires which mutually intersect and resist high temperature and high pressure and glue bonding the fiber wires together. When the metal wire sealing ring is arranged below the fiber wire sealing ring, axial pressure transmitted to the fiber wire sealing ring can be reduced due to the friction between the metal wire sealing ring and a central pipe and/or a sleeve pipe, and at the time axial pressure on the fiber wire sealing ring can be effectively reduced. The reason for generation of shoulder protrusion is too large axial pressure, so that generation of shoulder protrusion can be reduced or prevented through the design.

The invention discloses a high-speed grinding machine special for preformed armor rods, and aims to provide a high-speed grinding machine which collects high-speed flying chips generated by the preformed armor rods and avoids the damage to a human body. The high-speed grinding machine comprises a rectangular supporting plate, a fixing device used for clamping the preformed armor rods and a high-speed grinding machine used for grinding the preformed armor rods are arranged on the supporting plate, and a cleaning air bellow used for cleaning the flying chips of the preformed armor rods is arranged between the fixing device and the high-speed grinding machine; and the cleaning air bellow comprises an annular wind chamber arranged on the position of an end head of the high-speed grinding machine, and an induced draught fan and a chip-removing pipe are connected on the wind chamber. Through the arrangement of the wind chamber, the flying chips generated by grinding the preformed armor rods can be collected, and the temperature of a grinding cutter can further be decreased. Meanwhile, a spray header and a cooling system are arranged, the temperature of the grinding cutter and a main shaft are decreased, and the stability of the whole structure of the device is enhanced.

The invention relates to a clutch ( 2 ), especially for motor vehicles, for the torque connection of at least two drive parts which are rotatable about a rotational axis ( 4 ), comprising at least one clutch device ( 6 ) with a first clutch body ( 8 ) with at least one first clutch surface ( 12 ) and a second clutch body ( 10 ) with at least one second clutch surface ( 14 ), with said first and second clutch body ( 8, 10 ) being coaxially displaceable relative to each other by means of an actuating means ( 24 ) and said first and second clutch surface ( 12, 14 ) being mutually connectable in a non-positive way in at least one clutch engagement position, with the actuating means ( 24 ) comprising at least one ring gear ( 26 ) which comprises a ramp mechanism ( 28 ) and is twistable about the rotational axis ( 4 ) by an actuator ( 40 ), which mechanism, in the clutch engagement position, presses the first clutch body ( 8 ) against the second clutch body ( 10 ). The actuator ( 40 ) acts substantially in a tangential direction on the ring gear ( 26 ) via a linear motor ( 46 ), a worm gear ( 54 ) or a gearshift rod ( 58 ).

The rearmost main bearing of the internal combustion engine is arranged between a crankshaft shaft and a thrust cam of a thrust bearing. A thrust pad (20) is disposed between the axially forward sliding surface (22) of the thrust cam and the axially rearward bearing surface (18) of the stationary main bearing housing. The thrust cam (14) has a rotationally symmetrical arc-shaped groove (28) in a peripheral area, which groove extends radially inwards at most to the middle position of the thrust bearing bush (20).

The invention discloses a friction plate type self-adapting automatic separation driving assembly of an inner rotor motor of an electric motor cycle. The friction plate type self-adapting automatic separation driving assembly comprises a driving motor, a tank body, and a main shaft which is matched with the tank body in a rotating manner and outputs power, and further comprises a gear base, a clutch assembly, a first-stage gear, a transmission unit, a one-way gear and a one-way limiting screw cam. According to the friction plate type self-adapting automatic separation driving assembly disclosed by the invention, a novel plane type clutch assembly is used for transmitting torque, so that the friction plate type self-adapting automatic separation driving assembly has the advantages of being simple in structure, fast and convenient to assemble, easy to process, good in joint surface, fast in separation, free from impact, stable in torque force value, and the friction area can be infinitely increased. Through adjusting the number of external tooth friction pieces and the number of inner tooth liners and/or adjusting torque, nuts are adjusted to meet different requirements for the torque; when the torque is greater than a calibration value of the clutch assembly, the one-way limiting screw cam drives a thrust limiting screw cam, so that the external tooth friction pieces and the inner tooth liners are mutually loosened, the situation that the pressure in an axial direction is infinitely increased is effectively limited, the situation that the axial pressure of the main shaft is lower than 5000N is guaranteed, and the damage of a bearing on the main shaft is avoided.

The invention relates to a novel submersible electric energy-saving pump, and belongs to the field of submersible electric pumps. The novel submersible electric energy-saving pump comprises a submersible pump and a submersible motor matched with the submersible pump. The novel submersible electric energy-saving pump is technically characterized in that an electromagnetic axial force balancing device sleeves a rotating shaft between the submersible pump and the submersible motor, and the electromagnetic axial force balancing device is fixedly integrated with the submersible pump and the submersible motor through connection flanges respectively. Through the improvement, the novel submersible electric energy-saving pump disclosed by the invention has the advantages that the structure is simple, the implementation is easy to realize, the axial force of the submersible electric pump can be balanced, the abrasion of thrust bearings is effectively reduced, the frictional power consumption is reduced, the transfer efficiency is improved, the electric energy is saved, and the service life of the submersible electric pump is prolonged.

The invention discloses a forward extrusion uniform deformation die and relates to the field of metal plasticity forming. A groove is formed in the middle of a male die head of a male die body; an arched structure is arranged in the middle of the groove; the cross section of the arched structure is in an arc shape; the length of the groove is equal to the diameter of the male die head; and the height of the arched structure is the same as the depth of the groove. Friction force between a male die and a billet is greatly reduced, and uniform flow of metal is promoted.

The invention belongs to preparation or pre-treatment of formed materials and particularly discloses a rubber mixing machine with a self-cleaning function. The rubber mixing machine comprises a rubber mixing machine body and further comprises a first screw and a second screw which are mutually engaged, wherein the first screw and the second screw are rotationally disposed on the rubber mixing machine body; the first screw and the second screw are both conical screws; the depth of screw grooves of the first screw and the second screw is gradually changed in the length direction of the screws; the ratio of the depths of the screw grooves of the first screw and the second screw is equal to the ratio of the diameters of the first screw and the second screw. Compared with traditional rubber mixing machines, traditional rotary rollers are replaced with the first screw and the second screw which are mutually engaged; as the screws are mutually engaged, the effect of mutual scraping between the first screw and the second screw is achieved, the certain self-cleaning purpose can be achieved without extra scraping equipment, and therefore the rate of excellent products is increased.

A ship (20) with one or more liquid transport tanks (21) arranged in an upright position in a ship's hull, said transport tanks having an axial direction and a circumferential direction, and each transport tank comprising a tank bottom (22), a tank circumferential wall (25) and a tank roof (23), the tank bottom being supported on or forming part of a lower deck of the ship's hull. The tank circumferential wall is suspended by its lower and upper ends by means of deformable deformation absorbers (26) between the lower deck and an upper deck (24) of the ship's hull, which deformation absorbers are designed so as to absorb deformations between the ship's hull and the tank circumferential wall at least in the abovementioned axial direction, at least the lower deformation absorber extending in the circumferential direction around substantially the entire circumference of the tank circumferential wall, and at least the lower deformation absorber forming part of the tank wall and being accommodated at the position of the transition between the tank circumferential wall and the tank bottom so as to form a continuous sealing connection between them.