1328 results about "Circular cavity" patented technology

The pivoting knuckle joint for an outdoor lighting fixture comprises a base knuckle, a top knuckle and a fastener for locking the base and top knuckles in position. Each of the base knuckle and top knuckle has a generally cylindrical body with a domed top, a portion of which is cut-away to form a flattened face, and circular cavity formed in the flattened face with a tapered ferrule formed in and extending from the cavity. The ferrule of one of the knuckles has a smaller diameter than the other, so that the smaller ferrule fits within the larger ferrule, forming a pivot point. The relative diameters are adapted to closely fit such that friction is generated between the interfitting ferrules to form a taper lock, resisting rotation of one knuckle relative to the other. In the preferred embodiment, the smaller ferrule has an internal thread formed therein for receiving a locking screw inserted through the body of the knuckle with the larger ferrule, permitting the position of the joint to be locked in place after adjustment. Bores are formed through the base and top knuckles to provide a conduit for an electrical wire to pass through the assembly.

The invention discloses a plasma thruster based on a multilevel tip cusped magnetic field, relates to the field of plasma thrusting, and aims to solve the problem that the service life is short due to serious sputtering etching of ceramic wall surfaces caused by ions and further solve the problem of low power density of a conventional thruster. The number of circular permanent magnets is larger than or equal to 3; a working medium jet flow hole is formed in the bottom of a circular ceramic cavity body; anodes are arranged on the periphery of the working medium jet flow hole; the inner diameter of the front section A of the circular ceramic cavity body is larger than that of the inner diameter of the rear section C; the side wall of the circular cavity body is sleeved with a plurality of circular permanent magnets sequentially; magnetizing directions of two adjacent circular permanent magnets are opposite; a magnetic conducting ring is fixed between every two adjacent circular permanent magnets; a positive pole of a power supply is electrically connected with the anodes; and a negative pole of the power supply is electrically connected a hollow cathode, and the hollow cathode is located on an outlet side of the circular ceramic cavity body. The plasma thruster is mainly applied to the aerospace field.

Systems and methods for joint preparation and fusion are disclosed. The system includes a cutting device having a handle, and rigid blade member. The blade member may include cutting edges on first and second sides, and may be curved in one or more planes. The blade member may be deployed to project outside of an outer tube, and the cutting device may be rotated to create a circular cavity. In a method of use, a cannula provides access to a procedure site such as a joint. A pathway to the joint is created, and the cutting device is inserted and deployed to undercut a cavity in the joint. A fusion device may be implanted across the joint to provide compression and fuse the joint. The system may also include instrumentation for creating access to a joint, bone graft insertion and implant insertion.

The invention relates to a damping and tensile support with double curved surface, belonging to the technical field of civil engineering and particularly relates to a damping and tensile support used for civil engineering structure. A support body is provided with a damping mechanism comprising an inner arc surface on the upper part of the inner side of a circular cavity; the inner arc surface is covered with a first spherical surface metal plate layer; a spherical surface slide block is arranged below the first spherical surface metal plate layer; a first engineering plastic slide plate covers on the spherical surface slide block; a second spherical surface metal plate layer covers below the spherical surface slide block; a hyperbolic spherical plate of which the upper surface and the lower surface are spherical surfaces is arranged below the second spherical surface metal plate layer, the upper spherical surface of the hyperbolic spherical plate is covered with a second engineering plastic slide plate, and the lower spherical surface of the hyperbolic spherical plate is covered with a third spherical surface metal plate layer; a spherical surface support plate is arranged below the third spherical surface metal plate layer; a third engineering plastic slide plate covers the top of the spherical surface support plate; and the lower part of the spherical surface support plate is fixedly connected with the lower part of the inner side of the circular cavity. The invention has the advantages of simple construction, favourable damping effect, high bearing capability, favourable durability and the like.

The present invention describes a rotary valve for simultaneously diverting a plurality of liquid streams among a plurality of liquid receivers in a sequential and cyclic manner. Said rotary valve comprises: (1) a stator of barrel shape having a circular cavity, a bottom, a lateral structure, a group of first ports being spaced longitudinally along the lateral structure, and a group of second ports being evenly spaced apart on the bottom around the axis of the stator at the same distance from said axis, the number of the second ports being n multiple of that of the first ports wherein n is an integer of 1 or larger; (2) a rotor constructed by a hollow shaft section and a core section within said hollow shaft section, said hollow shaft section having a lateral structure accommodating a plurality of top openings that are longitudinally spaced apart and a bottom end accommodating a plurality of bottom openings that are evenly spaced apart around the axis of the hollow shaft at the same distance from said axis as the distance of the second ports from the axis of the stator, said core structure accommodating a plurality of flow passages that connect the top openings to the corresponding bottom openings; (3) the rotor being assembled in the circular cavity of the stator and a plurality of ring structures being sandwiched in-between the lateral exterior surface of the hollow shaft section of the rotor and the interior surface of said circular cavity and being longitudinally spaced apart, two adjacent ring structures forming one circular groove that is in fluid communication with a corresponding first port of the stator and a corresponding top opening of the rotor, the rotor being rotatable about the axis of said circular cavity, the junction between the exterior surface of the bottom end of the rotor and the interior surface of the bottom of the circular cavity of the stator forming a leak-proof contact with an exception of the bottom openings of the rotor which are in fluid communication with the corresponding second ports of the stator when a stepwise rotation of the rotor is properly indexed, each flow passage constantly being fluidly communicated with a corresponding first port, a top opening, and a bottom opening to form a constant flow path that contains the same fluid regardless of rotation, each second port of the stator receiving a different fluid when the second port is switched away from the currently engaged bottom opening to the adjacent bottom opening by a stepwise rotation, simultaneous diversion of multiple fluids being thus realized.

The invention relates to a one-point short-circuit circularly polarized antenna with a low-profile cavity-backed annular slot. The existing cavity-backed circularly polarized antenna based on one-point short-circuit of the annular slot has complex structure, large volume, inability to planar integration, and high cost. In the present invention, a metal layer is plated on both sides of the dielectric substrate, and the upper metal layer is etched with a microstrip line for power feeding and a common ground coplanar waveguide transmission line, and the middle metal strip of the coplanar waveguide transmission line extends outwards as a microstrip line . Through the upper metal layer, the dielectric substrate and the lower metal layer, a plurality of metallized through holes arranged in a circle are opened to form a cavity, and the coplanar waveguide transmission line extends into the cavity. The lower metal layer is etched with a circular radiation slit with a short circuit in the area corresponding to the cavity. Compared with the conventional cavity-backed circularly polarized antenna composed of a metal cavity, the present invention is manufactured by common PCB technology, has low manufacturing cost, can be seamlessly integrated with a microstrip circuit, and improves system integration.

The invention discloses a circular floating ocean platform capable of releasing multi-point mooring in the technical field of ocean oil-gas engineering and ships. The circular floating ocean platform comprises a ship body, a floater, a mooring cable and stand pipes, wherein the floater is sleeved to the interior of the ship body, the top of the floater is positioned above the surface of water, and two ends of the mooring cable are connected with the bottom of the floater and a seabed mooring point respectively; and if the lower ends of a plurality of the stand pipes are connected with underwater oil-gas production facilities at the seabed, the upper ends of the stand pipes are communicated to the top of the floater through the bottom of the floater, and connected to an interface on the top of the floater. The ship body has a circular structure, and the center of the ship body is provided with a hollow circular cavity for fixing the floater. The circular floating ocean platform works under severe sea conditions, is released in advance before heavy storm or iceberg or other severe sea conditions to drag a production oil storage and unloading platform ship body to a safe sea area to ensure safety, and is reconnected to recover normal production work after the severe environments.

The invention relates to a single-point coaxial feeding low-profile cavity-backed circularly polarized antenna. Ordinary cavity-backed circularly polarized antennas have complex structures, large volumes, and high manufacturing costs. In the invention, metal layers are plated on both sides of the dielectric substrate, and the upper metal layer is etched with two mutually perpendicular rectangular slits for radiating energy. Through the upper metal layer, the dielectric substrate and the lower metal layer, a plurality of metallized through holes arranged in a circle are opened to form a circular cavity. At the appropriate position of the angle bisector of two mutually perpendicular elongated radiation slots in the cavity area, a coaxial probe is connected through the lower metal layer and the dielectric substrate as a feed structure. Compared with the existing cavity-backed circularly polarized antenna composed of a metal cavity, the cavity of the present invention is manufactured by common PCB technology, so that the antenna has a small profile and low manufacturing cost.

The present invention relates to an all-optical-fibre adjustable bandwidth continuous spectrum laser pump source (FBCSL) for ultraflat wideband Raman amplification, belonging to the field of high-speed wideband optical fibre communication technology. It adopts a high optical non-linear optical fibre (HNL-DSF) with approaching flat zero dispersion characteristics at Raman laser wavelength place as gain medium, and on the two ends of the above-mentioned HNL-DSF) a wideband reflector can be connected to form all the optical fibre Fabry-Perot (F-P) adjustable bandwidth continuous spectrum Raman laser or a wideband wavelength division multiplexing optical fibre coupler is connected to form all-optical-fibre circular cavity adjustable bandwidth continuous spectrum Raman laser.

An output member for a Direct Impact Hopkinson pressure bar includes an elongate tube portion and a disc-shaped cap portion. The tube portion has a first end and an opposite second end, while the cap portion includes a first face and an opposite second face. A circular stub protrudes from a centre of the first face, and a circular cavity is formed in the second face. Each of the stub and the cavity is concentric with the cap portion, with a diameter of the cavity being greater than a diameter of the stub. The second face of the cap portion is positioned in intimate contact with the first end of the tube portion, with the cap portion being concentric with the tube portion.

A radome comprises a structure covering an antenna, the structure being substantially transparent to radiation of the antenna in a first direction and being less transparent to radiation of the antenna when deviating from the first direction, thereby imparting a directional profile to radiation of the antenna. The millimeter wave antenna structure comprises a sub-reflector lens, and a reflector, the sub-reflector lens in turn comprising a reflecting metal plate and a lens shaped dielectric material, the lens shaped dielectric material and the reflecting metal plate being shaped together to provide a predetermined radiation illumination pattern on the reflector. A waveguide matching holder connects a circular cross section waveguide via a circular cavity, and a rectangular waveguide feed via a rectangular cavity, the rectangular and the circular cavities being shaped to merge into each other.

The invention discloses a millimeter wave blackbody radiation calibration source with a biconical cavity serial structure, which is cylindrical as a whole and has a cylindrical structure made of metalmaterial. An integrated cavity structure connected in series by a lip, a circular cavity, a transition section and a conical cavity which are all in rounding off from top to bottom is arranged in thecenter of a cylinder, and the opening surface of the cavity is arranged in the center of the top of the cylinder. A cavity inner wall wave-absorbing material coating is made of wave-absorbing material coated on the inner wall of the cavity according to the required thickness. The invention lowers the probability that radiation energy incident from the opening surface is reflected and returned from the opening surface during transmission in the cavity so that the radiation energy is reflected many times in the cavity and absorbed. Through controlling the coating depth, the invention solves theproblem that the consistency of temperatures of blackbody calibration sources is influenced due to overlarge coating depth and poor thermal conductivity while improving the absorptivity of the cavityinner wall of the blackbody radiation calibration source to the radiation energy.

The invention is a device and measuring method for using Brillouin optical fiber circle laser to measure linewidth of ultra-narrow laser, which relates to a measuring device and method for laser linewidth. The output of the laser source is connected to the input of the isolator, the output of the isolator is connected to the input of the fiber coupler, the output of the coupler is connected to the inlet of the fiber coupler, the output of the fiber coupler is connected to the input of the photoelectric diode, the output of the photoelectric diode is connected to the input of the frequency spectrum analyzer, the fiber circular cavity is formed by connection one end of the aperture circle made up of unimodular fiber and the port of the fiber coupler, another end of the aperture circle is connected to the port three of the coupler. The method is: the laser needed to be measured is sent into the fiber circle cavity, when the power of the laser needed to be measured reach the threshold of SBS, it generates a first order Stokes light in the coupler, when the power of the first order stokes light reach the SBS threshold, it generates the second order stokes light in the coupler, then the second order stokes light and the laser needed to be measured frequency are analyzed by the frequency spectrum analyzer, and the linewidth can be acquired.

The present invention relates to a pneumatic tire, specifically to improvements to the bead region of tires designed for runflat operations. The improvements comprise the addition of cavities or indentation (126) on the surface of the bead (127) that contacts the wheel rim (128). In a first embodiment a series of circular cavities (126) are located on the radial innermost surface of the bead in the proximity of the bead toe. In a second embodiment, a continuous groove-like torus cavity (226) is located in the radially innermost surface of the bead in the proximity of the bead toe. The series of cavities or torus cavity increase the adherence of the bead to the rim as a small volume of air at a low pressure, significantly inferior to the atmospheric pressure (air vacuum situation) is trapped in the void spaces created by the cavities or torus cavity and the bead seat.

A temporary protective cover for junction boxes with or without installed switches and/or outlets and for conduit bodies, empty or containing wires or cables of various sizes and uses. The protective cover having a front and rear surface; having a trapezoidal cavity sized to receive installed switches and/or outlets in junction box; the protective cover having two elongated tabs that extend on either side of installed switch or plug inside junction box, for securing the protective cover to junction boxes and conduit bodies; having rectangular or circular cavity opening that is sized to fit openings of junction boxes or conduit bodies, in such a manner that the cover remains fixed relative to the junction box or conduit body.

The invention provides a triaxial test device for testing the transubstantiation of sediments of a gas hydrate. The device comprises a closed pressure chamber consisting of an outer cover barrel and a base; an inner cover barrel is arranged in the closed pressure chamber; the inner cover barrel is fixed on the base; at least two oil inlet/outlet holes are formed on the base; the opening of one oil inlet/outlet hole is formed on a circular cavity between the outer cover barrel and the inner cover barrel; the opening of the other oil inlet/outlet hole is formed on an inner cavity of the inner cover barrel; pistons are arranged on the tops of the outer cover barrel and the inner cover barrel; exhaust holes are formed on the pistons; a lower pressure pad and an upper pressure pad which correspond to each other are arranged in the inner cavity of the inner cover barrel; the upper pressure pad corresponds to the positions of the pistons; and the lower pressure pad is fixed on the base.

A giant magnetostrictive actuator with permanet torque output and a control method thereof belong to the magnetostrictive actuator field, and particularly relate to a giant magnetostrictive actuator with permanet torque output which uses a giant magnetostrictive rod as the core element and a control method thereof. The giant magnetostrictive actuator is in an axisymmetric structure, wherein a barrel-shaped cylinder is arranged at the bottom of the circular cavity of a barrel-shaped shell which is provided with a circular boss at the bottom and a circular groove in the center; a lower magnetizer is arranged at the bottom of the circular cavity of the cylinder; and a cylindrical magnet yoke is arranged on the upper part of the lower magnetizer. The control method of the giant magnetostrictive actuator comprises the following steps: firstly establishing a permanent torque output control module of the giant magnetostrictive actuator, and secondly using a giant magnetostrictive positive effect model, a giant magnetostrictive inverse effect model and a giant magnetostrictive material elastic modulus model to eliminate the coupling effect of the magnetostrictive positive effect and inverse effect in the giant magnetostrictive rod and ensure that the giant magnetostrictive actuator can complete permanent torque output under the combined action of the current in a coil and an external force.

The invention discloses a microwave attenuation type high stationary-phase high precision GNSS measurement type antenna and device. The antenna comprises a sector crossed oscillator, a half-opened circular cavity, a diameter suspension plate, a microwave attenuation plate, a leading plate and a polarization separation power dividing module. The sector crossed oscillator is installed in the center of the bottom of the half-opened circular cavity through a support assembly comprising four support column bodies. The sector crossed oscillator comprises four unit oscillators. The unit oscillators are installed on the tops of the support column bodies respectively and at the same height above the cavity bottom. The setting height of the sector crossed oscillator and the depth of the half-opened circular cavity are determined through adjustment, thereby achieving flat-opening radial-plane radiation. The top of the sector crossed oscillator and the leading plate are coaxially installed in an insulation manner through a medium circular ring. The diameter suspension plate is installed at the lower bottom of the half-opened circular cavity coaxially at a certain interval. The microwave attenuation plate is close to the bottom face of the diameter suspension plate and installed coaxially. The polarization separation power dividing module and an LNA module are arranged at the bottom of the microwave attenuation plate. The antenna is small, light, simple and low in cost.

A bucket holding apparatus includes first and second carriages with pivotally attached inner edges arranged in such a manner that the first and second carriages freely rotate upwardly from a horizontal plane defined on a support surface. The bucket holding apparatus further includes first and second arcuate walls directly conjoined to the first and second carriages and oppositely situated from the inner edges such that the first and second arcuate walls define a circular cavity within a combined perimeter thereof. The bucket holding apparatus further includes an arcuate lever directly and statically conjoined to the second carriage and extending laterally upwards away from an outer edge thereof.

The invention discloses a fan device achieving active noise reduction. The fan device is in the shape of a circular cavity assembly. A noise reduction device and a fan fixing structure are arranged in the circular cavity assembly. The noise reduction device comprises a noise collection unit, a noise reduction module and a noise reduction loudspeaker unit. The noise reduction module comprises an active noise reduction SOC chip and a power amplifier circuit. The noise collection unit, the active noise reduction SOC chip, the power amplifier circuit and the noise reduction loudspeaker unit are connected in sequence. A noise reduction loudspeaker fixing assembly is also arranged in the cavity of the circular cavity assembly. According to the fan device achieving active noise reduction, the noise collection unit and the noise reduction module are installed on a fan air channel, signals with phases opposite to phases of noise sources are generated by means of the active noise reduction technology, fan noise is counteracted inside the pipeline, and the fan noise is effectively lowered; in addition, the fan device has the advantages of being advanced in technology, easy and convenient to achieve, wide in application prospect and the like.

A locking hinge especially used in a folding shoulder rest for paintball guns. The locking hinge comprises a first hinge plate and a second hinge plate in relative rotation. The first hinge plate has a hinge joint axis, a plurality of symmetric mounting holes, and a counter bore for receiving the locking mechanism. The counter bore in the first hinge plate contains a spring and a locking cylinder. The locking cylinder has a taper on the end directed toward the second hinge plate. The second hinge plate has a relative hinge joint axis, a plurality of tapered circular cavities or notches, and a means for symmetric mounting. The locking mechanism sufficiently aligns with the tapered circular cavities or notches at plurality of predetermined positions thereby preventing rotation of the hinge plates. A minor misalignment between the locking mechanism and tapered circular cavities further provide rigid locking of the hinge plates.

The invention discloses a water heater with the function of self-cleaning water scales on an insulating inner container and heating rods. The water heater comprises a shell and the insulating inner container arranged in the shell, and the two heating rods are horizontally installed on the inner side wall of the insulating inner container; a circular cavity is formed in the side wall of the shell;a ball screw is coaxially and rotatably connected to the inner wall of the insulating inner container, and the right end of the ball screw sequentially penetrates through the insulating inner container and the shell and is rotatably connected to the inner wall of the circular cavity; the joint of the ball screw and the insulating inner container is connected in a rotating and sealing mode; the side wall of the portion, located in the circular cavity, of the ball screw is fixedly sleeved with a rotating cylinder; a heat transfer base is fixedly connected to the inner bottom of the circular cavity; and multiple electromagnet brush pieces are arranged on the side wall of the rotating cylinder at equal distance in the circumferential direction of the rotating cylinder. According to the water heater, the conception is novel, the water scales on the surfaces of the insulating inner container and the heating rods of the water heater can be removed after water is heated by the water heater every time, and therefore the heating efficiency and the insulating effect of the water heater are guaranteed.