13results about How to "Increase effective length" patented technology

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 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 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 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 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 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 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 size-adjustable hanging lug comprises two symmetrical main bodies and two limiting pieces, one end of each main body is provided with an inserting groove, a limiting part is arranged in each inserting groove, the other end of each main body extends to form a tail foot, each tail foot is of an arc-shaped structure, the tail end of each tail foot extends to form a contact part, and each contact part is provided with an elastic part. A sliding groove is formed in the middle of the body in a penetrating mode, a plurality of protrusions arranged at intervals extend in the sliding groove, a groove is formed between every two adjacent protrusions, the two ends of the sliding groove are close to the inserting groove and the tail foot respectively, the body, the tail foot and the contact part are all made of elastic deformation materials, and the limiting piece is connected with the tail end of the contact part. The limiting piece is arranged in the sliding groove to slide, and the limiting piece is clamped into one groove to be detachably connected with the groove. The utility model provides a size-adjustable hanging lug and a spectacle frame. The optimal length of a spectacle leg matched with the head of a user is adjusted through the hanging lug.