22 results about "Helix" patented technology

The invention concerns a stent comprising a longitudinal axis (12) and a peripheral wall (14) which is formed at least over a part of the length of the stent (10) by a lattice-like carrier structure (24) which is open at two ends. The carrier structure includes at least one bar (16) extending helically around the longitudinal axis in such a way as to provide a helical primary shape (26) for the peripherally extending bar with more than one helical turn. Besides the helical primary shape (26) the bar has a zigzag-like or meander-shaped secondary shape (30) with reversal points and associated reversal portions (32), between which extend bar portions (34) of the peripherally extending bar with an extension component in the longitudinal direction of the stent. The carrier structure further includes connecting bars (40) which respectively bridge over a helical turn of the helical primary structure and which at their two longitudinal ends attach to the bar portions (34) of the helical primary shape between two respective adjacent reversal points.

Face enveloping gears are machined by face milling type cutting tool or gear shaper. This process includes the following steps: positioning of the cutting tool in tangential relation relative to the meshing enveloping pinion thread with face gear by the smallest pitch diameter of threads with face gear teeth; turning rotating cutter relative to axis of rotation of an imaginary enveloping wheel until generating tooth is on the outer circle of the face gear. For generation of enveloping pinion the complementary cutting tool has additional motion around axis of pinion rotation. In another method tooth shaper or helical hob rotating tool rotates around axis of rotation of a theoretical generating gear for enveloping pinion with a predetermined relative motion to axis of rotation of work gear. This reduces production cost and makes manufacturing easier.

The invention discloses a single-screw extruder comprising a frame, a bearing chamber, a transitional shaft, a seal cover, a feed inlet, a discharge sleeve, a discharge outlet, a screw tapered shaft and the like. One end of the screw tapered shaft penetrates the left of the seal cover and is in insetting connection with the head of the transitional shaft. The discharge side of the other end of the screw tapered shaft is mounted within the discharge sleeve and is connected with a moving cantilever of the discharge sleeve. The screw tapered shaft is provided with a plurality of spiral blades; a screen plate is disposed between the screw tapered shaft and the seal cover. The screw tapered shaft in such a shape that the diameter of the screw tapered shaft decreases and then increases from the feed end to the discharge end; the pitch of the spiral blades gradually increases from the feed end to the discharge end; the diameter of the part, at the first blade and close to the discharge sleeve, of the screw tapered shaft is 396mm to 398mm, and the diameter of the part, at the third blade and close to the discharge sleeve, of the discharge sleeve is 386mm to 392mm; the discharge sleeve is tubular, with the inner diameter being 400mm to 406mm; a distance between the discharge sleeve and the screw tapered shaft is 7mm to 10mm. The single-screw extruder has the advantages such that extrusion, tearing and dewatering are effective and the screw tapered shaft rarely abrades.

The invention provides a phase changing flapping mechanism and a dragonfly-imitated flapping wing aircraft. The phase changing flapping mechanism comprises a body bracket, a screw mechanism fixed on the body bracket and a rotary driving mechanism, wherein the screw mechanism comprises a screw, a nut matched with one end of the screw, a sliding rail fixedly connected to one side of the nut, a sliding block matched with the sliding rail and a sliding driving mechanism driving the nut to move back and forth along the sliding rail; and the rotary driving mechanism comprises a driving motor and a transmission mechanism connecting the driving motor and the sliding block. The phase changing flapping mechanism and the dragonfly-imitated flapping wing aircraft are simple in structure, convenient tomanufacture and low in cost, and flapping parameters of the flapping-wing aircraft can be changed in the flight process, so that the flight posture of the aircraft is changed, different flapping functions are realized, the flapping-wing aircraft is enabled to hover for flight, the flexibility is enhanced, and the application value of the dragonfly-imitated flapping-wing aircraft in the fields ofmilitary reconnaissance, complex terrain observation and the like is improved.

The invention relates to a high flow disturbance sphere rotor inside a heat exchange pipe. The high flow disturbance sphere rotor inside the heat exchange pipe is formed by a sphere, inclined straight blades and spiral blades; the inclined straight blades are arranged at two ends of the sphere; the spiral blades are arranged in the middle of the sphere; transparent hollow structures are arranged in the middle of the sphere and the surfaces of the spiral blades. According to the high flow disturbance sphere rotor inside the heat exchange pipe, radial motion of the fluid and damage to the boundary layer are increased due to the fact that combination of the inclined straight blades and a sphere front projection enables the heat transmission fluid which flows through the rotor front end to rush nearby the pipe wall; the tangential motion of the fluid is reinforced and the heat exchange process is further reinforced due to the fact that the inclination directions of the inclined straight blades are opposite to the screwing directions of the spiral blades; the flow disturbance function on the fluid inside the pipe is further reinforced due to the fact that the inclined straight blades are arranged at the rear end of the sphere; alternate screw motion at left and right screw directions of the fluid inside the pipe is achieved due to the fact that the inclined straight blades which are arranged at the rear end of the sphere are matched with the inclined straight blades which are arranged at the front end of the sphere and the spiral blades which are arranged in the middle.

A first oscillation circuit in which a helical antenna is used as a part of an element for a resonance circuit and a second oscillation circuit in which a loop antenna is used as a part of an element for a resonance circuit are caused to oscillate at substantially the same frequency. When a human body approaches the helical antenna and the loop antenna, the frequency difference increases between the first oscillation circuit and the second oscillation circuit. This frequency difference is extracted using a BPF.

The invention relates to a tube-shell type heat exchanger which used the U-shaped cross-helical tube, involving an engine exhaust recycle heat exchanger. For improving the engine exhaust recycle system, accelerating the exhaust cooling and increasing the heat exchange efficiency. The heat exchanger includes the heat exchange tube, shell and the tube board, the heat exchange tube is the U shaped siphon, whose two ends fixed on the same tube board, the heat exchange tube is the stainless steel tube which has the entad raised cross-helical groove on the surface, the cross is the 'X'-shaped, the section shape of the stainless steel pipe is a special flat shape, and the height and width of the section shape in the flat shape heat exchange tube are unlikeness. Because of the application of the cross-helical heat exchange tube, the tube inside and outside produce the turbulent flow, not easy to dirty and increase the heat exchange efficiency. The heat exchanger has a compact structure, is particularly suitable for the exhaust gas recycle coolers of a vehicle engine, reduce the discharge of the nitrogen oxygen compound and enhance the exhaust discharge performance indicators, at the same time, the invention can also be used as the mid cooler of a turbocharger system to improve the engine performance.

To surely and easily secure a return tube to a nut and prevent the return tube from floating and expanding when circulating failure of balls occurs. The ball screw device has a screw shaft having a helical shaft raceway groove on the outer face thereof, a nut having a nut raceway groove on the inner face so as to oppose to the shaft raceway groove, a load path formed by the shaft raceway groove and the nut raceway groove, balls rotatably mounted in the load path, a communicating member communicating both ends of the load path to guide the balls exterior of the nut and having a bent portion; a tube fixture for fixing the communicating member to the nut and a reinforcement member for receiving stress applied to the bent portion of the communicating member on an outer face of the tube fixture.

The invention provides a helical pipe used for researching the detonation wave propagation characteristic. The helical pipe comprises a helical plate, a first helical pad, a second helical pad, a sootiness plate and an annular pad. The helical plate compacts the first helical pad and the second helical pad between the upper and lower surfaces of the helical plate through bolts, the diameter of the first helical pad is larger than that of the second helical pad, the sootiness plate is embedded between two helical pads and aligns to the upper surfaces of the two helical pads, the annular pad is arranged between the upper surfaces of the two helical pads and the upper surface of the sootiness plate and the lower surface of the helical plate, and the lower surface of the sootiness plate, opposite side surfaces of the two helical pads and the upper surface of the helical plate form a detonation wave propagation channel. According to the invention, the detonation wave can be propagated continuously in a multi-circle annular channel, and the phenomenon, of the detonation wave, which cannot be observed in a low-angle bend pipe can be researched.

A spiral radiator and spiral funnel is characterized by comprising a spiral pipe (1) and a cover (2), ports are formed in the two ends of the spiral pipe, the cover is provided with a hole, and the port in one end of the spiral pipe communicates with the hole in the cover; or covers are arranged on the ports in the two ends of the spiral pipe correspondingly, and the ports communicate with holes in the covers. The following problems of pollution of viruses, bacteria, dust and the like in air to liquid, low heat dissipation efficiency, slowness, time consumption, refrigerating equipment or lower-temperature liquid needing and mark damage due to wetting are solved, wherein the problems are caused when people cool liquid.

The invention discloses a dissociation-solidification abrasive particle composite wire saw cutting method for photovoltaic polycrystalline silicon cells. The method comprises the following steps: (1)photovoltaic polycrystalline silicon workpieces are cut through a sawing wire; (2) mortar with dissociated silicon carbide abrasive particles is sprayed to a cutting area; and the dissociated siliconcarbide abrasive particles are distributed and constrained in a spiral baked wire area without solidified abrasive particles on the surface of the sawing wire; and (3) in the sawing process, the photovoltaic polycrystalline silicon workpieces are cut by the sawing wire; and meanwhile, the dissociated silicon carbide abrasive particles in the mortar are constrained in the spiral baked wire area onthe surface of the sawing wire under movement of the sawing wire to grind a cutting surface to cut the photovoltaic polycrystalline silicon cells. The method adopts the dissociated abrasive particle and solidified abrasive particle composite wire saw cutting to grind the surfaces of slices during slicing, and removes cutting line marks and plastic smooth areas on the surfaces of the slices causedby solidification abrasive particle wire saw cutting to form microstructures similar to the surfaces of the dissociated abrasive particle wire saw slices on the surfaces of the slices.

A spiral staircase comprises a central supporting element and a plurality of steps which are connected to the supporting element at a first end, there being two types of steps positioned in an alternating fashion, of which a first type of step is substantially “L”-shaped and a second type of step is substantially arrow-shaped.

The invention belongs to the technical field of environmental protection, and relates to a ground sewer detecting and clearing robot. The ground sewer detecting and clearing robot is mainly characterized by being composed of a sewer detecting and clearing robot shell 1, a high-definition surveillance camera 2, a top cover box 3, an electronic control chip board 4, a storage battery 5, spiral stirring blades 6, a main motor 7, a main motor bracket 8, a spiral conveyor (spiral blade) 9, a conical spiral conveyor (conical spiral blade) 10, a main motor spindle 11, a conical body 12, a spindle tail end bearing bracket 13, electric traveling wheels 14, a boneless flexible spiral conveyor pipe buckle joint 15, a boneless flexible spiral conveyor 16 and a boneless flexible spiral conveyor pipe 17. The ground sewer detecting and clearing robot has the characteristics of being simple, small and flexible in structure, easy to construct and repair, and capable of replacing workers to detect and clear residue and sludge in a ground sewer, and the accident that the workers are poisoned after descending to a well is reduced.

A centrifugal pump having a barrel casing and at least one stage casing therein includes a transition from the last stage casing to the pressure connector of the barrel casing in the form of a spiral flow space. The contour of the spiral flow space is formed by a contour of the last stage casing, a contour of a cover which closes the barrel casing on an end face, and an inner contour of the barrel casing.

The invention discloses a helical corrugated winding pipe. The helical corrugated winding pipe comprises a pipe body which is formed by helically winding and bonding an Omega-shaped belt, wherein the pipe body comprises a pipe wall and a helical corrugated structure which is arranged at the outer side of the pipe wall and is integrally formed with the pipe wall; the belt comprises a corrugated bulge, a first basal plate and a second basal plate, wherein the section of the corrugated bulge is in the shape of a circular ring which is obtained by cutting out a plane, and is provided with an open abnormal shape; the first basal plate and the second basal plate are respectively connected to the opening two sides of the corrugated bulge; one end, far from the corrugated bulge, of the first basal plate is further provided with a first connecting plate; and one end, far from the corrugated bulge, of the second basal plate is further provided with a second connecting plate. According to the helical corrugated winding pipe disclosed by the invention, in production, the belt is wound on a forming mould in a helical mode, and adjacent two turns of belts are matched and bonded together by virtue of respective first connecting plate and second connecting plate to obtain the pipe body. According to the helical corrugated winding pipe, the raw material cost is low, the production process is simple, the product cost is greatly reduced, and the product stability is good.

The invention relates to a rear-axle folding and unfolding device for a spiral pipe welding unit. The rear-axle folding and unfolding device comprises a rear axle component, an oscillating cylinder component and a proportional reversing component, wherein the rear axle component is horizontally placed, a rear axle and oscillating cylinder connection lug is welded at the middle of the side surface of the rear axle component, a round hole is formed in the rear axle and oscillating cylinder connection lug, another round hole is formed in the spherical top end of the oscillating cylinder component, the rear axle component and the oscillating cylinder connection lug are fixed through a connection cylindrical pin inserted into the two round holes, a pin positioning plate is inserted along the radial direction of the connection cylindrical pin, and an axle folding oil circuit inlet and an axle unfolding oil circuit inlet of the oscillating cylinder component are respectively connected with two oil circuit input/output ports of the proportional reversing component through an axle folding oil pipe and an axle unfolding oil pipe. The rear-axle folding and unfolding device has the following characteristics: axle folding and unfolding rates can be set through the proportional reversing component, shaping of welded pipes is stabilized, and weld joint quality is improved; and overshooting of a rear axle is prevented, a controllable shaping trend can be obtained, and violent axle folding and unfolding are avoided.

The invention discloses a steam generation tank for a power station. The steam generation tank comprises a tank body and a solar outer heat pipe. A liquid inlet pipe is formed in the side wall of the tank body, two gas outlet pipes which are symmetrical are formed in the side wall of the top end of the tank body, nozzles are rotationally arranged on the inner walls of the two gas outlet pipes, a plurality of spiral protrusions are installed on the inner walls of the nozzles, a diversion plate is fixed to the top end of the tank body, the axis of each gas outlet pipe is right opposite to the bend outer conical surface, and a solar inner heat pipe is fixed into the solar outer heat pipe through a flange plate. According to the steam generation tank, after steam is discharged into the tank body, the diversion plate with the middle portion downwards protruding to form an inverted cone is arranged on the top of the tank body, the inverted conical outer conical surface bends inwards along the center line of the inverted cone, that is, the longitudinal cross section of the inverted cone is in an inverted ridge shape, the diversion plate provides curve path guiding for the movement of steam, discharging of the steam is accelerated, and meanwhile the situation that steam is accumulated on the top of the tank body, consequently, part of steam is fused and then freely descends is avoided.

The invention discloses a spiral blade for a shaver. The spiral blade is matched with a cutting mesh of the shaver, and comprises a spiral main body; the circumferential outer edge of the spiral mainbody is provided with an edge capable of performing cutting along the axis; and a central shaft is inserted in the cavity of the spiral main body and is fixedly connected with the spiral main body. The spiral blade for the shaver provided in the invention has a spiral main structure, the spiral body processing process can be continuous forming, the processing process is simple, the processing costis low, and the product quality is easily ensured. The invention also discloses a shaver, which comprises the above spiral blade and has the corresponding advantages.