43results about How to "Reduce radial stress" patented technology

A catheter may include a multiple lumen catheter tube, a hub attached to the catheter tube, and a first extension leg and a second extension leg attached to the hub. The multiple lumen catheter tube may include a longitudinal axis, an end, a first lumen, and a second lumen. The first lumen and the second lumen extend through the catheter tube along the longitudinal axis and each having an opening. The end of the catheter tube and the openings of the lumen may be disposed within the hub so that the opening of the first lumen is axially spaced with the end of the catheter tube. The first extension leg may be coupled to the first lumen and the second extension leg may be coupled to the second lumen for the separate delivery of fluids to the lumens.

The invention discloses a testing system for internal temperature distribution in the process of fusion cast forming of explosives. The testing system is formed by an optical fiber Bragg grating sensor array, a signal detecting and demodulating device, a service and monitoring device and an explosive fusion casting device. The optical fiber Bragg grating sensor array is formed by optical fibers in an S-shaped arrangement mode, wherein a plurality of grating sensors are arranged on the optical fibers, and the optical fiber Bragg grating sensor array is fixed on one half of the central axis surface in the explosive fusion casting device. The grating sensors are arranged at intervals and distributed in an array mode. The signal detecting and demodulating device is located outside the explosive fusion casting device and is connected with the optical fibers. The service and monitoring device is in circuit connection with the signal detecting and demodulating device. The testing system effectively shelters the elasto-optical effect of Bragg grating to a thermal stress response, and can carry out sensing and measuring on temperature signals singly so as to carry out continuous multipoint monitoring on the change conditions of an internal temperature field in the process of fusion cast of the explosives.

The invention discloses a trocar seal membrane and assembly comprising normal concave-channels and reverse concave-channels. Said seal membrane comprises a proximal opening, a distal aperture, and a sealing wall from the distal aperture extending to the proximal opening, said distal aperture formed by a sealing lip for accommodating the inserted instrument forms a gas-tight seal, said sealing wall comprising a proximal surface and a distal surface. Said sealing wall is a seamless sealing body with a plurality of normal concave-channels and a plurality of reverse concave-channels surrounding the sealing lip in an alternating manner. The normal concave-channels and reverse concave-channels has the functions of enlarging hoop circumference, reducing the wrapped-area, improving lubrication reliability, increasing the axial tensile stiffness, etc., thereby, the frictional resistance and the stick-slip can be greatly reduced.

The invention discloses an improved pleated trocar seal membrane. Said seal membrane comprises a proximal opening, a distal aperture, and a sealing wall which extends from the distal aperture to the proximal opening, said distal aperture formed by a sealing lip for accommodating the inserted instrument and forming a gas-tight seal. Said sealing lip comprises a longitudinal axis and a transverse plane substantially perpendicular to said axis. Said sealing wall comprises a plurality of pleats extending laterally from the sealing lip. Each said pleat comprises a pleat peak, a pleat valley and a pleat wall extending there between. And the lip-adjacent area, the depth of the pleat wall gradually increases along the longitudinal axis; while outside the lip-adjacent area, the depth of which gradually decreases along the longitudinal axis. Said pleats enlarge hoop circumference, and reduce the cylinder hoop strain (stress) when a large diameter instrument is inserted, thereby reducing the hoop force and the frictional resistance.

The invention discloses a trocar seal membrane with concave-channel structure. Said seal membrane comprises a proximal opening, a distal aperture, and a sealing wall from the distal aperture extending to the proximal opening, said sealing wall comprising a proximal surface and a distal surface, said distal aperture formed by a scaling-lip for accommodating the inserted instrument and formed a gas-tight seal, said sealing-lip comprising a longitudinal axis and a transverse plane substantially perpendicular to said axis. In the lip-adjacent area, said sealing wall comprises the main rotary-wall and a plurality of concave-channel each of the concave-channels includes two side sealing-walls, which are defined by both edges and extending laterally outward from the sealing-lip and gradually widening. Said concave-channels have the functions of enlarging hoop circumference, reducing the wrapped area, improving lubrication reliability, increasing the axial tensile stiffness, etc., thereby, greatly reducing the frictional resistance and the stick-slip.

The invention provides a while-drilling remote control type multi-stage bent-angle-adjustable screw drilling tool, which comprises a casing, a stator, a rotor, a shaft coupler, a bearing and an output shaft, wherein a steering knuckle is connected between the shaft coupler and the output shaft; a bypass hole is processed in the output shaft; an adjusting device is arranged in an annular space formed between the casing and the output shaft, and is glidingly matched with a positioning pin; a spring is arranged outside the output shaft arranged at the lower part of the adjusting device; and an eccentric matching structure is formed among the adjusting device, the output shaft and the casing. The screw drilling tool has the advantages that the bent angle of the underground screw drilling tool is controlled through turning on/off of the pump on the ground; the multi-stage adjustment can be performed, so that the technical requirements of drilling processes of wells with different build angle rates and complicated structures can be met; meanwhile, the number of drilling tool replacing times of pipe tripping is reduced; the underground complicated condition occurring risk is reduced; and the drilling efficiency of wells with complicated structures is improved.

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

The invention relates to a method for treating a thermocouple conduit leakage in an in-core instrumentation system. The method comprises the following steps of cutting a second portion of the leakingthermocouple conduit, drilling a conduit seat to form a filling hole and forming a circular corner at the connecting joint between the side wall of the filling hole and the bottom of the filling hole,arranging a plug with a chamfer in the thermocouple conduit and sealing the thermocouple with the plug to make the circular corner and the chamfer form a groove, and carrying out welding and sealingon the groove. The above method effectively solves the problem of the leakage of the thermocouple conduit in the in-core instrumentation system. Besides, during the welding, the root of a welding seamis easily exposed to the viewing angle range of a welder, and a tungsten pole can overcome space obstacle to more easily reach the root of the welding seam so that the quality of the root of the welding seam is greatly improved. The invention also provides a welding bracket used for the above method, the welding bracket is used for placing an operator's hand to make the welding more stable, makethe controlled welding accuracy higher and ensure the welding quality.

The invention discloses a seal membrane with a trocar sealing System capable of integral inversion. Said seal membrane comprises a proximal opening, a distal aperture, and a sealing wall which extends from the distal aperture to the proximal opening, said the sealing wall comprising a proximal surface and a distal surface, said distal aperture formed by a sealing lip for accommodating the inserted instrument and forming a gas-tight seal; said sealing wall, in the lip-adjacent area, is a seamless sealing body with a plurality of normal concave-channel and a plurality of reverse concave-channel surrounding the sealing lip in an alternating manner; said said normal concave-channel is recessed from the proximal surface of the sealing wall toward the distal surface and the opening oriented to the proximal surface.

The invention discloses an energy storage flywheel and a design method thereof, and belongs to the technical field of energy storage flywheels. The energy storage flywheel comprises a hub and N layers of composite material rings which are assembled on the hub in an interference mode. The widths of the N layers of composite material rings are the same, and under the condition that the energy storage flywheel rotates, centrifugal force borne by all the layers of composite material rings is the same. According to the energy storage flywheel and the design method thereof, the defect that the radial stress does not meet the allowable strength requirement due to the increase of the radial stress ring by ring caused by centripetal force in the traditional multilayer equal-thickness layer ring design can be overcome, and the mechanical properties of various materials can be fully utilized, so that higher energy storage density can be obtained, and the design of a high-capacity and ultra-large-capacity composite material energy storage flywheel becomes possible.

The invention provides a reinforced hoop for a vaporization cooling flue. The reinforced hoop comprises a shroud ring (2) and a hoop plate (7) which are vertically arranged on the outer surface of a flue (1) in a sleeving manner; each of the shroud ring (2) and the hoop plate (7) is formed by splicing four sector arc segments; the four arc segments of each of the shroud ring (2) and the hoop plate (7) are vertically and correspondingly distributed; every two adjacent arc segments are connected by an elastic assembly; outward-protruded hoop ears A (4) are vertically arranged on two sides of each segment of the shroud ring (2); outward-protruded hoop ears B (8) are vertically arranged on two sides of the bottom of each segment of the hoop plate (7); a round hole A (5) and a round hole B (9) are separately formed in the center of each hoop ear A (4) and the corresponding hoop ear B (8); a plurality of guide rings (3) are symmetrically distributed in the circumferential direction of the shroud ring (2); guiding shafts (6) matched with the guide rings (3) are symmetrically distributed in the circumferential direction of the hoop plate (7). The reinforced hoop provided by the invention can release radial deformation stress and axial deformation stress of the flue while the rigidity of the flue is enhanced; the reinforced hoop is simple to assemble and disassemble, and high in practicality.

The invention discloses a homogenization hot spinning forming method for a large-diameter high-pressure gas cylinder, and relates to the field of high-pressure-bearing seamless gas cylinder machining.The homogenization hot spinning forming method comprises the steps that an arc-shaped turning plate is used for spinning the end of a seamless steel pipe, and a cobalt-based alloy surfacing layer is arranged on the working face of the arc-shaped turning plate; after an area within the range of the length L of one end of the seamless steel pipe is heated, a spindle clamping jaw of a spinning machine is used for clamping the seamless steel pipe, the forming face of an arc-shaped turning plate is coated with aquadag, the seamless steel pipe is rotated at the rotating speed of 25 rad/s-29 rad/s, when the seamless steel pipe rotates, the arc-shaped turning plate rotates by 1/4 circle in the closing-in direction at the rotating speed of 0.0015 rad/s-0. 0035 rad/s, and then one-time forming is completed; and after the closed end is completely closed and formed, the arc-shaped turning plate is fed by the length M along the inner side of the axis of the seamless steel pipe and then is turned over by 1/4 circle in the reverse closing direction, so that the problems that the forming quality of the sealing head of the high-strength steel large-diameter seamless steel pipe processed through hot spinning is poor, and the service life of the turning plate is short are solved.

The invention relates to the field of electrical engineering, in particular the design of linear electric motors for submersible installations with a plunger pump, and used for oil extraction. The technical result is to increase the durability of the submersible electric motor and the efficiency of its operation. The stator consists of a cylindrical housing, within which are installed magnetically conductive cups incorporating armature coils and support elements separating the groups of cups, whereby the inner diameter of which is less than the inner diameter of the magnetically conductive cups. On the inner surface of the support elements, grooves are provided, the depth of which is more than half the difference between the inner diameters of the magnetically conductive cups and the support elements. Moreover, the magnetically conductive cups and the support elements are installed in a housing with a radial clearance and are attached therein by fastening elements.

A flywheel includes a wheel ring and a hub ring fitted into the wheel ring. A hub ring main body of the hub ring pressure-contacts an inner periphery of the wheel ring while the flywheel is rotating. The pressure contact of the hub ring with the inner periphery of the wheel ring allows compressive stress applied to the wheel ring in a radial direction to cancel a portion of tensile stress acting in the wheel ring in the radial direction. As a result, the stress in the wheel ring in the radial direction decreases.

A pressure sensing element, including a substrate, a device layer coupled to the substrate, a diaphragm being part of the device layer, and a plurality of piezoresistors coupled to the diaphragm. A plurality of bond pads is disposed on the device layer, and an electrical field shield is bonded to the top of device layer and at least one of the bond pads. At least one stress adjustor is part of the electrical field shield, where the stress adjustor is a cut-out constructed and arranged to reduce thermal hysteresis of the pressure sensing element caused by stress relaxation of the electrical field shield during a cooling and heating cycle. The stress adjustor may be a thin film deposited on top of the electrical field shield, which may apply residual stress to the piezoresistors. The pressure sensing element may include a cavity integrally formed as part of the substrate.

The invention relates to a film conveying mechanism and an extrude-emptying mechanism of an automatic vertical type filling and packaging machine. The two ends of conveying wheel axles of the film conveying mechanism are connected with static bearing pedestals and movable bearing pedestals, the static bearing pedestals are fixedly installed on a support, the movable bearing pedestals are movably installed on the support, the support is fixedly connected with an intermediate plate, and a conveying and pushing mechanism is arranged between the static bearing pedestals and the movable bearing pedestals and can control the movable bearing pedestals to be close to or far away from the static bearing pedestals. Extrude-emptying rolls of the extrude-emptying mechanism are installed in the middlesof extrude-emptying roll shafts, the two ends of the extrude-emptying roll shafts are connected with extrude-emptying brackets, the upper ends of the extrude-emptying brackets are fixed to rotating shafts, the two ends of the rotating shafts are connected with fixing brackets on the two sides, the fixing brackets are fixedly connected with the intermediate plate, the back-side extrude-emptying bracket is provided with an extrude-emptying pushing mechanism which can push the back-side extrude-emptying bracket to do reciprocating motion around the corresponding rotating shaft, and the extrude-emptying rolls are close to each other and far away from each other through fan-shaped gears which are arranged on the rotating shafts and mesh with each other.