36results about How to "Increase effective length" patented technology

The invention discloses a low-repetition-frequency spiral microcavity structure and a design method, and belongs to the field of silicon-based integrated photon chips. The low-repetition-frequency spiral microcavity structure comprises a first spiral bent waveguide, a second spiral bent waveguide, an internal connection bent waveguide, an external connection bent waveguide and a bus waveguide. The curvature radius of each point of the internal connection bending waveguide changes along with the length and meets the Euler spiral equation, and the internal connection bending waveguide is used for connecting the starting points of the first spiral bending waveguide and the second spiral bending waveguide. The external connection bending waveguide is used for connecting the end points of the first spiral bending waveguide and the second spiral bending waveguide. The first spiral bent waveguide, the second spiral bent waveguide, the internal connection bent waveguide and the external connection bent waveguide form a closed spiral annular waveguide. A light beam transmitted in the bus waveguide is coupled into the spiral annular waveguide. The invention further discloses a design method of the low-repetition-frequency spiral microcavity structure. According to the invention, loss caused by high-order mode crosstalk and mode mismatch can be reduced, and the area utilization rate of a chip is improved.

The invention discloses a narrow linewidth fiber laser based on random distribution feedback loop self-injection locking, and relates to the technical field of fiber lasers. The wavelength division multiplexer, the erbium-doped optical fiber, the optical band-pass filter, the optical coupler I, the optical coupler II, the polarization controller and the optical isolator are sequentially connected end to end to form an annular cavity, the pumping source is connected with the wavelength division multiplexer, and the random distribution feedback structure is connected with the optical coupler III to form an optical fiber ring to form a random distribution feedback ring. A first port and a third port of the optical circulator are connected with the first optical coupler and the second optical coupler respectively to form a self-injection structure, a second port of the optical circulator is connected with the third optical coupler, and the remaining output end of the second optical coupler serves as the output end of the annular cavity. The laser frequency drift of the annular cavity can be reduced by utilizing the random distribution feedback ring, the effective length of the random distribution feedback structure is increased by increasing the round-trip times of optical signals, a narrow-band gain peak can be ensured, stable narrow-linewidth single-frequency laser output can be obtained, and the linewidth narrowing efficiency and the environmental sensitivity are improved.

The invention discloses a planar gate power device. A device unit comprises a drift region, a planar gate, a channel region, a source region and an anti-JFET region. The anti-JFET region is at least divided into an anti-JFET top layer region and an anti-JFET bottom layer region, and the anti-JFET top layer region is located between the channel regions on the two sides of the plane gate. The doping concentration of the anti-JFET top layer region is smaller than that of the anti-JFET bottom layer region, and the lower doping concentration of the anti-JFET top layer region is used for reducing stepping of the device. The higher doping concentration of the bottom region is used to reduce the specific on-resistance of the device. The first doping layer penetrates through the source region and the channel region, and the top region of the first doping layer is used for being in contact with the channel region and serving as a channel leading-out region for leading out the channel region; and the bottom region of the first doping layer is used for exhausting the bottom region of the anti-JFET, so that the breakdown voltage of the device is improved. The invention further discloses a manufacturing method of the planar gate power device. The on-resistance of the device can be reduced and the breakdown voltage of the device can be increased while the stepping of the device is reduced.

The utility model provides a charging pile swing arm device and a charging pile, the charging pile swing arm device comprises a base, the top surface of the base is provided with a first bearing; the first end of the main shaft is connected with the base, and the main shaft is configured to rotate in the base; the coil spring balancer is connected with the second end of the main shaft, and an abutting structure abutting against the first bearing is arranged at the bottom of the coil spring balancer; and the swing arm is connected with the coil spring balancer, and when the swing arm swings, the coil spring balancer is driven to rotate so as to drive the main shaft to rotate. According to the charging pile swing arm device and the charging pile, the coil spring balancer is arranged at the second end of the main shaft, the coil spring balancer can increase the effective length of the gun line, waste of the length of the gun line is reduced, and the user experience is improved.

The application discloses a variable stiffness rotor supporting structure based on adjusting the length of a squirrel cage bar and an adjusting method, belongs to the field of rotor supporting structure design of an aero-engine, and aims at solving the problem that the flexible supporting structure adopted by a modern aero-engine is difficult to adapt to the characteristics of the changeable working conditions of the modern aero-engine. The application comprises a mounting seat, a fixed squirrel cage, a movable squirrel cage, a sliding seat and two sliding units. The fixed squirrel cage is arranged at the center of the front side of the mounting seat, the movable squirrel cage is inserted into the other end of the fixed squirrel cage, one end of the movable squirrel cage is in sliding connection with the other end of the fixed squirrel cage, the other end of the movable squirrel cage is sleeved with the sliding seat, and the two sliding units are arranged on the back side of the mounting seat. The fixed end of each sliding unit is fixedly connected with the back side of the mounting seat, and the sliding end of each sliding unit penetrates through the mounting seat and is detachably connected with the sliding seat. The application is mainly used as a supporting structure of a rotor in an aero-engine.

The utility model provides a flange used for a bell jar standing cavity and the bell jar standing cavity, and the flange used for the bell jar standing cavity comprises an annular flange main body and an external connection part used for being connected with an external base, the external connecting part is arranged on the outer side wall of the flange main body; an annular butt joint groove used for being in butt joint with a bell jar standing cavity is formed in the upper end of the inner side wall of the flange body, and the bottom wall of the annular butt joint groove is connected with the inner side wall of the flange body through a first inclined face. The first inclined face is used for being matched with the bottom end face of the bell jar standing cavity to form a first groove used for welding when the bell jar standing cavity is embedded in the annular butt joint groove. According to the utility model, the effective length of the weld joint at the joint of the flange and the bell jar standing cavity is increased, so that the stress level of the weld joint in unit length is effectively reduced, the connection stability between the flange and the bell jar standing cavity is enhanced, and the overall rigidity of a final product is improved.

The application relates to the hair dryer technical field and provides a hair dryer with a rear-mounted temperature controller, which comprises a hair blowing head, a heating assembly and a temperature controller arranged in the hair blowing head; the heating assembly comprises a heating wire support and a hollow heat insulation cover, the first heating wire is wound around the outer periphery of the heating wire support, and the hollow heat insulation cover is arranged on the outer periphery of the first heating wire; the temperature controller is arranged in the hollow heat insulation cover and located at one end of the heating assembly far from an air outlet, and the side of the temperature controller far from the air outlet is provided with the second heating wire; a handle is arranged in the handle and is connected with the hair blowing head in communication, and the air making assembly is used for supplying air to the hair blowing head. According to the application, the temperature controller is arranged at one end of the heating assembly far from the air outlet, and the second heating wire is arranged at the side of the temperature controller far from the air outlet, so that the reaction sensitivity of the temperature controller is ensured, the interference of the temperature controller on the airflow in the hair blowing head is reduced, and the airflow noise is reduced.

The graphite piece comprises an upper cone, a middle body and a lower cone which are sequentially arranged from top to bottom, the middle body is a cylinder, an upper through hole is formed in the center of the upper cone and used for installing a silicon core, a lower through hole is formed in the center of the lower cone and used for being communicated with a graphite clamping seat, and the upper through hole is communicated with the lower through hole. The taper of the upper cone is larger than that of the lower cone, and the height of the upper cone is smaller than that of the lower cone. According to the scheme, the graphite piece is designed into a vertically asymmetric structure, the height of the upper cone is smaller than that of the lower cone, the taper of the upper cone is increased, the silicon core holding force is large, the loading force is enhanced, and the silicon core toppling resistance is enhanced; according to the improvement of the scheme, on the premise that the height and other dimensions of the original reduction furnace are not adjusted, the effective length of the silicon core is increased by reducing the height of the graphite piece, and then the effective length of the generated silicon rod is increased.

This application provides a locking mechanism, a housing assembly, and an electronic device. The locking mechanism includes a fixing component, a locking component, and a shape memory alloy member. The fixing component is used to fix the device to a first housing. The locking component is slidably disposed on the fixing component and is used to lock or separate from the second housing. The shape memory alloy member can contract and extend to change its length by power supply. The shape memory alloy member includes a first end and a second end disposed opposite to each other, and at least one winding end disposed between the first end and the second end. The first end is connected to the locking component, the second end is used to fix the device to the first housing, and the winding end is used to wind around the winding portion of the first housing to change the extension direction of the shape memory alloy member. This application not only realizes the locking function but also increases the effective length of the shape memory alloy member, increases the sliding distance of the locking component, reduces the difficulty of locking and unlocking the locking component and the second housing, and improves the service life of the shape memory alloy member.

The present invention provides an adjustable valve clamp and a valve clamp system, wherein the valve clamp system comprises an adjustable valve clamp and a pushing device. The adjustable valve clamp comprises a push rod, at least two clamp arms, and at least one extension arm, wherein the push rod axially moves to drive the clamp arm to open and close relative to the push rod, and drives the extension arm to extend or retract along the axial direction of the clamp arm. The present invention arranges a retractable extension arm on the surface of the clamp arm of the valve clamp, and when the clamp arm is opened relative to the push rod, the extension arm extends out of the clamp arm, which is equivalent to increasing the effective length of capturing the leaflet. The longer clamp arm can provide a better supporting effect on the leaflet when capturing the leaflet, and prevent the leaflet from slipping off the surface of the clamp arm; after clamping, the extension arm can be retracted again, and the excessively long clamp arm and the extension arm can prevent the leaflet from being excessively pulled by the leaflet, thereby quickly and safely capturing the active leaflet through the adjustable clamping effective length, reducing the difficulty of surgery and improving the efficiency of surgery.

The present invention relates to the field of atomic sensing technology, and in particular to a flat-top beam two-dimensional magneto-optical trap, which is used to solve the problem that the light intensity distribution of the elliptical light spot in the major and minor axis directions of the existing two-dimensional magneto-optical trap is Gaussian, resulting in the linear cold atomic beam having large divergence angles at both ends, uneven density distribution in the longitudinal direction (along the beam direction), and wide atomic velocity distribution. The flat-top beam two-dimensional magneto-optical trap includes an ultra-high vacuum cavity, a cooling and trapping laser optical path system, a first group of anti-Helmholtz coil components, and a second group of anti-Helmholtz coil components. The present invention uses a non-spherical optical element in the cooling and trapping laser optical path system, so that the cooling and trapping laser beams are shaped into uniform laser beams with rectangular cross sections, and the light polarization states are consistent on the beam cross sections.

The utility model relates to the technical field of automobile steering systems, in particular to a steering engine sensor cover capable of preventing an FOD rubber part lip from sliding, which comprises a sensor cover body, a boss ring and a plurality of convex inclined planes, the boss ring is arranged on the end face of the sensor cover body, and the convex inclined planes are arranged on the end face of the sensor cover body. The convex inclined planes are arranged between the boss ring and the edge of the sensor cover body, and the sections of the convex inclined planes are zigzag. Compared with the prior art, the outer side of the boss ring of the sensor cover body is additionally provided with a plurality of rings of convex inclined surfaces, so that the risk of sealing failure caused by outward sliding of an FOD rubber part during compression is reduced, and the installability is improved; the convex inclined surface with the sawtooth structure increases the effective length of the sealing surface, reduces the width of the end surface of the sensor cover body, and improves the sealing performance and economical efficiency of the product.

The invention belongs to the technical field of memory alloy testing, and discloses a testing device and a testing method compatible with a memory alloy wire and an air valve. The testing device comprises a constant-temperature box, a control box arranged in the constant-temperature box, a wire testing assembly and an air valve testing platform, wherein a controller is arranged in the control box, and the wire testing assembly and the air valve testing platform are movably arranged with the box body. Wherein the wire material testing assembly comprises a detachable wire material clamping device and a wire material testing platform. At the moment, the wire material testing assembly and the air valve testing platform can be respectively or simultaneously arranged on the box body and are connected with a controller in a wiring manner, so that the performance test of a plurality of memory alloy wire materials and a plurality of / or a plurality of memory alloy air valves can be simultaneously realized through the device. The testing method is carried out based on the testing device. Therefore, the method has the technical advantages of being simple in testing process, low in testing cost and high in accuracy.

The utility model belongs to the technical field of magnetic ring inductance structure, specifically disclose a kind of large current's magnetic ring inductance structure, including flat conductor and plane magnetic ring;Flat conductor is sheet, middle section is horizontal, both ends are bent and perpendicular, the middle part through-hole of plane magnetic ring is sheet, including first plane magnetic ring and second plane magnetic ring, the both ends of flat conductor are respectively inserted into the middle part through-hole of first plane magnetic ring and second plane magnetic ring and fixed, the both ends of flat conductor are respectively exposed from downside and form pin on the side away from middle section.The utility model effectively increases the total effective length of magnetic circuit by two plane magnetic rings, and the magnetic ring of plane structure further effectively magnetic circuit cross-sectional area, increase magnetic flux.The setting of cooperation flat conductor improves the overcurrent capacity of magnetic ring inductance, and the area of conductor is also increased to improve the heat dissipation capacity, realize high reliability's large current magnetic ring inductance.

The utility model discloses a kind of thermochemical energy storage reactors, including cylinder, heating device, heat exchange coil subassembly and water vapor distributor, cylinder side is equipped with heat exchange medium inlet pipe, cylinder other side is equipped with heat exchange medium outlet pipe, cylinder inside two sides are equipped with tube sheet, energy storage medium is filled in the shell side between the tube sheet of both sides of cylinder;Heating device is fixed in cylinder inside by several fixed frame;Heat exchange coil subassembly includes helical heat exchange pipe;Water vapor distributor includes concentric ring pipe group being set to both sides of cylinder, the ring pipe of both sides corresponding position is communicated by several steam pipes, and both ends of water vapor distributor each is equipped with two water vapor inlet and outlet.The utility model distributes the multiple steam pipes in water vapor distributor evenly in energy storage medium, enhances the flowability of water vapor in cylinder, strengthens the fluidization of solid particles in cylinder, reduces the degree of solid particle agglomeration, enhances the stability of system operation.

This application provides a charging pile swing arm device and a charging pile. The charging pile swing arm device includes: a base; a main shaft, the main shaft including a first part and a second part, the first part being connected to the base, and the main shaft being configured to rotate within the base; a coil spring balancer, the coil spring balancer being connected to the second part of the main shaft; and a swing arm, the swing arm being connected to the coil spring balancer, the swing arm swinging to drive the coil spring balancer to rotate, thereby driving the main shaft to rotate. The charging pile swing arm device and charging pile provided in this application embodiment have a coil spring balancer provided at the second end of the main shaft. The coil spring balancer can increase the effective length of the charging cable, reduce cable waste, and improve the user experience.

The invention relates to the technical field of vehicle air conditioning systems, and discloses a brush blower motor and a vehicle air conditioning system. The brush blower motor comprises a casing, a stator assembly and a rotor assembly, the stator assembly and the rotor assembly are arranged in the casing, the brush blower motor further comprises a rear cover and a connector assembly, and the rear cover is connected with the casing; the plug-in connector assembly comprises a brush plate, the brush plate is arranged on the inner side of the rear cover, the plug-in connector assembly is further provided with a damping pad, the damping pad is arranged to be in a trapezoid shape, and the short edge of the trapezoid is close to the bottom wall of the rear cover. The plug-in connector assembly further comprises an electric brush and a constant-force spring, the brush plate is arranged in the rear cover, the electric brush and the constant-force spring are both arranged on the brush plate, and the constant-force spring abuts against the electric brush with preset elastic force; and the brush plate and the rear cover are integrally formed by plastic. The trapezoidal anti-vibration pad is arranged between the brush plate and the inner wall of the rear cover and used for increasing the contact area of the anti-vibration pad and the rear cover, so that when the brush blower motor works, the smooth buffering effect is achieved, and vibration and noise are effectively reduced.

The invention relates to the technical field of building electromechanical installation, in particular to a building electromechanical equipment installation system which comprises a supporting ring, two connecting rods are slidably connected to the top of the supporting ring, a first rope is fixed between the two ends of one connecting rod, and a second rope is fixed between the two ends of the other connecting rod. The top of the first rope and the top of the second rope are provided with suspension assemblies, and adjusting mechanisms are fixed to the two ends of the connecting rod. According to the transformer hanging device, the mode that in the prior art, a transformer is hung through a rope by using one hook is changed into the mode that the transformer is hung through the cooperation of two hooks and two ropes, the lengths of the two ropes are adjusted through the adjusting mechanism, the two ropes can be kept in a balanced state, and the transformer is switched to be hung; the situation that the transformer after rotating and position adjusting automatically rotates along with the twisted rope after the hand is released is effectively prevented, and the transformer in the suspended state can be maintained to be stabilized at the adjusted position after rotating and position adjusting.

The application discloses a quartz crystal-based adjustable strong-field terahertz light source and an adjusting method thereof, and belongs to the optical field. The terahertz light source is designed by using the high damage threshold and low absorption characteristics of the quartz crystal in the terahertz wave band. In addition to the femtosecond laser, the beam-reducing system, the grating, a pair of X-direction achromatic column lenses, the 1 / 2 wave plate and the quartz crystal required by the general inclined wave front, the terahertz light source further comprises a pair of Y-direction column lenses. One of the X-direction achromatic column lenses is replaced by a double-lens combined lens. The focal length of the combined lens is finely adjusted by adjusting the lens spacing of the combined lens. The grating front mirror is placed on a translation stage to adjust the grating incidence angle. The inclination angle of the quartz crystal is 43 degrees, and the terahertz light is emitted along the inclined surface of the quartz crystal. The application adjusts the THz center frequency from 2 to 4 THz and the terahertz spectrum width from 0 to 6 THz by simultaneously adjusting the focal length of the combined lens, the grating incidence angle and the emission angle, and realizes the terahertz generation efficiency of nearly 0.04%.

The utility model discloses a silk thread taking and placing manipulator which comprises a seat frame, a clamping mechanism and a dragging mechanism. The clamping mechanism is arranged at one end of the seat frame, and the dragging mechanism is arranged at the other end of the seat frame; the clamping mechanism comprises a finger air cylinder connected with the seat frame and clamping jaws arranged on two fingers of the finger air cylinder. The dragging mechanism comprises a swing cylinder arranged on the seat frame, a carrier roller arranged on the swing cylinder and a pressing wheel assembly arranged on the seat frame in a sliding mode. According to the utility model, the clamping mechanism and the dragging mechanism are arranged; and meanwhile, the guide mechanism is arranged, so that the silk yarns are prevented from swinging.

The utility model discloses a sound production unit, which comprises a yoke, a voice coil, a first side magnetic structure, a centering disk and two groups of central magnetic structures, a fixed table is convexly arranged on the yoke, a conductive piece is arranged in the fixed table in a penetrating manner, and the conductive piece is provided with a conduction part exposed out of the sound production unit; the center magnetic structures are arranged on the yoke, the two center magnetic structures are oppositely arranged, a gap is formed between the two center magnetic structures, and the fixing table is located in the gap; the two opposite sides of the voice coil are provided with inner concave parts, the inner concave parts are located in the gap, and the fixing table is located between the two inner concave parts. The first edge magnetic structure is arranged on the yoke, and the first edge magnetic structure is provided with an extension part extending into the concave area of the inner concave part; the centering disk comprises an inner fixing part, a cantilever part, a lifting part and an outer fixing part which are connected in sequence, the inner fixing part is fixed on the fixing table and electrically conducted with the conductive piece, and the outer fixing part is fixed on the vibrating diaphragm assembly and electrically conducted with the voice coil. The sound production unit is good in acoustic performance.

The utility model discloses a foldable bar chair, which relates to the technical field of foldable bar chairs, and comprises a support plate, the outer surface of the support plate is provided with a taking hole, the outer surface of the support plate is provided with a magnetic block I, the outer surface of the support plate is fixedly connected with a bulge, and the inner surface of the support plate is fixedly connected with a folding mechanism; the auxiliary plate can rotate around the outer surface of the connecting shaft, when folding is needed, the second magnetic block and the first magnetic block attract each other, the auxiliary plate and the supporting plate are combined, the seat plate rotates around the fixing shaft, the second magnetic plate and the first magnetic plate attract each other, the seat plate and the auxiliary plate are combined, and finally the whole structure becomes a vertical plane and is convenient to carry; the stability of the folding state is ensured through magnetic attraction fixing, the problem that the folded folding chair is likely to be scattered in the moving process is solved, meanwhile, the containing grooves and the protrusions at the bottom of the seat plate can play a fixing role when unfolded, and the sliding condition is prevented.

The utility model discloses a sound production unit, which comprises a voice coil, a central magnetic structure and an edge magnetic structure, and two opposite sides of the voice coil are provided with inner concave parts; the whole center magnetic structure is H-shaped, the center magnetic structure comprises two groups of convex magnetic structures, and the two groups of convex magnetic structures are close to each other to form avoiding parts corresponding to the inner concave parts; and the edge magnetic structure corresponding to the inner concave part is provided with an extension part extending into the concave area of the inner concave part. According to the sound production unit, the effective length of the voice coil in a magnetic circuit system can be effectively increased without increasing the overall size, so that the BL value of the sound production unit is increased, the sensitivity of the sound production unit is improved, and the effect of improving the performance of a miniature loudspeaker is achieved; moreover, the H-shaped central magnetic structure is formed by combining the two convex magnetic structures, so that the situations of deformation, breakage and the like of the H-shaped middle position due to insufficient strength are avoided, the waste of production raw materials of the sound production unit is reduced, and the service life of the sound production unit is ensured.

The application discloses a Helmholtz type low broadband aerodynamic noise reduction super surface and a design method thereof, and relates to the technical field of aerodynamic noise suppression. The super surface comprises a plurality of arrayed Helmholtz type low broadband aerodynamic noise reduction super surface units; the super surface unit comprises a plurality of parallelly arranged Helmholtz low frequency aerodynamic noise reduction structures. The Helmholtz low frequency aerodynamic noise reduction structure comprises a hollow square cavity; the inside of the square cavity is divided into a first cavity and a second cavity by a partition plate, a first cylindrical hole structure is arranged on the partition plate and extends to the inside of the first cavity; a plurality of second cylindrical hole structures are arranged on the upper wall of the square cavity and extend to the outside of the square cavity; the first cylindrical hole structure, the second cylindrical hole structure and the second cavity constitute a neck structure of the Helmholtz low frequency aerodynamic noise reduction structure. The application can efficiently control low frequency aerodynamic noise.

The invention discloses a semiconductor structure and a forming method thereof, and the method comprises the steps: providing an initial substrate which comprises a plurality of active regions; the active regions are etched to form a substrate, the substrate comprises channel regions located in the active regions, and each channel region is provided with at least one convex part or at least one concave part or a combination of a plurality of convex parts and a plurality of concave parts; and forming a storage gate structure on the surface of the channel region, wherein the projection of the convex part or the concave part on the surface of the substrate is located in the projection range of the storage gate structure on the surface of the substrate. According to the semiconductor structure and the forming method thereof, the channel length of a flash memory device is increased, and the erasing efficiency of the device is optimized.

The utility model discloses a sound production unit, which comprises a yoke, a voice coil, a first side magnetic structure and two groups of central magnetic structures, and a magnetic conductive structure is convexly arranged on the yoke; the center magnetic structures are arranged on the yoke, the two center magnetic structures are oppositely arranged, a gap is formed between the two center magnetic structures, and the magnetic conduction structure is located in the gap; the two opposite sides of the voice coil are provided with inward concave parts, the inward concave parts are located in the gap, and the magnetic conductive structure is located between the two inward concave parts. The first edge magnetic structure is arranged on the yoke, and the first edge magnetic structure is provided with an extension part extending into the concave area of the inner concave part. According to the sound production unit, the effective length of the voice coil in a magnetic circuit system can be effectively increased without increasing the overall size, so that the BL value of the sound production unit is increased, the sensitivity of the sound production unit is improved, and the effect of improving the performance of a miniature loudspeaker is achieved; the magnetic conductive structure on the yoke can enable the magnetic circuit assembly to form a complete magnetic loop corresponding to the area near the inner concave part.

The invention discloses an optical amplifier based on a lithium niobate waveguide doped with rare earth elements on lithium tantalate and a manufacturing method, and relates to the technical field of optical communication. Comprising a lithium tantalate substrate layer, a rare earth element-doped film lithium niobate device layer and an upper cladding which are sequentially stacked from bottom to top, the rare earth element-doped film lithium niobate device layer is provided with a ridge waveguide, the height and the width of the ridge waveguide are micron-level, and two end surfaces of the ridge waveguide are respectively coupled with optical fibers. Compared with a currently reported lithium niobate film nanometer waveguide optical amplifier, the lithium niobate film nanometer waveguide optical amplifier has the advantages that the mode size is larger, the effective waveguide length is longer, the overall gain effect of the device is larger, and the saturation output power is high. The ridge waveguide and the lensed optical fiber / high numerical aperture optical fiber have good mode matching, so that the difficulties of low coupling efficiency, high device insertion loss and low output power and saturation power in similar nano waveguide optical amplifiers are effectively solved, the performance is greatly improved, the manufacturing cost is reduced, and the optical fiber amplifier has practical application potential.

The invention belongs to the technical field of drill rod threads, and particularly relates to a drill rod thread capable of improving bearing capacity distribution in the thread tooth generatrix direction and a drill rod thereof.The drill rod thread comprises an external thread connector and an internal thread connector, and the external thread connector comprises an external thread connector body; one end of the external thread joint main body is connected with a drill rod, and the other end of the external thread joint main body is sequentially provided with an external thread joint main shoulder surface, an external thread joint taper pipe thread and an external thread joint auxiliary shoulder surface which are matched with the internal thread joint; and a main shoulder root groove is formed between the main shoulder surface of the external thread joint and the taper pipe thread of the external thread joint. The circular bead structure is changed into the main shoulder root groove, and the maximum stress value point of the external thread is transferred to the main shoulder root from the first ring tooth root at the thread connection part, so that the stress value of the main shoulder side root of the external thread can be effectively reduced, the stress concentration is reduced, and the service life of the thread tooth is prolonged.

The utility model belongs to the technical field of earphone panel units, and particularly relates to a multi-magnet multi-voice coil suspension panel unit, which aims to improve the transduction efficiency and enhance the sound performance of an earphone, and comprises a shell, a unit upper magnetic group, a unit lower magnetic group and a conductive voice coil assembly, the unit upper magnetic group, the unit lower magnetic group and the conductive voice coil assembly are sequentially overlapped and assembled and are arranged in the shell; the unit upper magnetic group comprises a plurality of annular upper magnets with different diameters, the annular upper magnets are arranged in a concentric circle, the unit lower magnetic group comprises a plurality of annular lower magnets with different diameters, the annular lower magnets are arranged in a concentric circle, the number of the annular lower magnets and the number of the annular upper magnets are m, and the annular lower magnets and the annular upper magnets are oppositely arranged in a one-to-one mode; the conductive voice coil assembly comprises a diaphragm assembly and a plurality of annular voice coil assemblies, the plurality of annular voice coil assemblies are arranged in a concentric circle, the number of the annular voice coil assemblies is m-1, and each annular voice coil assembly is arranged at the gap of every two adjacent annular lower magnets. The device has the advantage of high transduction efficiency.

The invention relates to a metal corrugated hose and a production process, the metal corrugated hose comprises a metal corrugated pipe and at least one fine pipe fitting, at least one end of the metal corrugated pipe is provided with a butt-joint reducing end, the fine pipe fitting is provided with a butt-joint expanding end, the outer end of the butt-joint reducing end is in butt-joint and welding connection with the large-diameter end of the butt-joint expanding end, and the outer end of the butt-joint reducing end is in butt-joint and welding connection with the large-diameter end of the butt-joint expanding end. And the diameter of the butt joint reducing end part is gradually reduced from the side of the metal corrugated pipe to the side of the fine pipe fitting. The metal corrugated hose has the advantages that the effective length of the hose can be effectively increased by directly welding and connecting the metal corrugated pipe and the fine pipe fitting, meanwhile, the metal corrugated hose has a better degree of freedom, the flow resistance of liquid transmission is reduced, and the fatigue life can be prolonged under the working condition of movement.