62results about How to "Uniform radial force" patented technology

A spring clutch is provided which has improved durability by preventing a clutch spring from breaking due to fatigue. A cylindrical clutch spring made from a wire having a square section is mounted between a pulley and a pulley hub mounted in the pulley. An end of the clutch spring is coupled to the pulley hub. A clutch surface is formed on the inner periphery of the pulley and is formed with a large-diameter recess at a position opposite to the end portion of the clutch spring including the torque transmission end. When the pulley rotates in one direction, the clutch spring expands. At this time, the end portion of the clutch spring including the torque transmission end expands in the large-diameter recess, thus relaxing sharp torque produced in the clutch. This prevents local stress concentration on the clutch spring and breakage of the clutch spring and improves the durability of the clutch.

An efficient positive displacement motor under a well comprises a bypass valve assembly, a falling prevention joint, a motor joint, a universal joint assembly and a bearing joint assembly. The efficient positive displacement motor under the well is simple in structure, convenient to use, stable in operation under the well, safe, reliable, high in complete machine efficiency, capable of outputting larger torque, long in working time and service life, suitable for drilling needs of various complex wells at the present, free of piercing leakage and high in working reliability. A streamlined flow channel enables water conservancy losses of a main flow channel to be reduced, turn-off force is large, the defects of the interference effect and tooth form distortion of the conjugation curvature of a traditional single-screw machine type positive displacement motor are overcome, a universal shaft operates flexibly, energy efficiency is high, the universal shaft can work in the environments where no sand grain exists, and drilling fluid erosion exists, the service life is long, and mechanism strength is high.

The invention relates to a rotating servo valve capable of realizing the continuously and steplessly adjustable flow rate, and belongs to the technical field of a hydraulic servo valve. The rotating servo valve is characterized in that the axial position of a valve core is regulated through rotating a spiral micrometer device connected with the valve core for changing the rated flow rate of the servo valve, four rectangular grooves are correspondingly formed in the valve core and a valve sleeve, and when the valve core and the valve sleeve relatively rotate, the rectangular grooves are mutually communicated or sealed for controlling the output flow rate, so the servo valve has the four-way function. The rotating servo valve has the effects and advantages that the valve core and the valve sleeve relatively rotate, the friction force is small, the anti-pollution capability is high, the zero-opening characteristics are realized, the dynamic performance is high, the structure is compact, the flow rate is high, the radial stress is balanced, and the manufacture difficulty is low.

The invention discloses a composite sealing device applied to a piston of a hydraulic cylinder, and the hydraulic cylinder and belongs to the technical field of the hydraulic cylinders. The compositesealing device adopts a separated type piston and comprises at least two piston bodies, wherein a tiny radial clearance exists between the outer edge of a first piston body (2) and the inner wall of acylinder barrel (12) in order to form a first clearance seal; and the outer edge of a second piston body (6) is respectively provided with a sealing part (7), a first retainer ring (5) and a secondretainer ring (8) to form a sealing ring seal. The first piston body (2) and the second piston body (6) are integrally connected with each other through screw threads so as to form a composite piston.The composite piston is integrated with one sealing ring seal and at least one clearance seal in the axial direction so as to form a composite sealing structure. The composite sealing device disclosed by the invention simultaneously adopts the sealing ring seal and the clearance seal to prevent internal leakage, overcomes the shortcomings of the prior art when the sealing ring seal and the clearance seal are used independently, achieves a good sealing effect and is applicable to occasions of which the oil liquid pressure is large and the requirements on the sealing performance are high.

The invention discloses a seamless stent and a manufacturing method of the seamless stent; the seamless stent is used for being intervened in a blood vessel and is formed by weaving at least one weaving thread; each weaving thread has an even number of free ends, and the free ends of the weaving thread are in butt joint in pairs; after being wound by the weaving threads, the stent has a cylindrical structure; all the free ends of each weaving thread are respectively provided with a cutting part; the cutting parts of every two free ends which are in butt joint are spliced in a seamless way, so that a splicing part is formed, and the diameter of the splicing part is equal to that of the corresponding weaving thread; a connecting pipe sleeves outside each splicing part; the inner walls of the connecting pipes are connected with the outer walls of the splicing parts in a seamless way. According to the seamless stent, the splicing parts formed by the free ends of the weaving threads are connected with the connecting pipes in a seamless way; the free ends of the weaving threads are provided with the cutting parts, and the diameters of the splicing parts formed by splicing the free ends are equal to those of the weaving threads, so that the diameters of the splicing parts are reduced, and the radial force and the axial force of the free ends are evenly distributed; the contact area among the free ends are enlarged by the cutting parts of the free ends, so that laser welding is conveniently carried out; the seamless stent is good in flexibility and excellent in attractiveness.

A repair sleeve carrier for transporting a repair liner into a conduit to the location of damage or leakage for repairing the conduit from the inside, the sleeve carrier having a segmented flex tubing and a bladder with ends attached to the flex tubing and an unattached middle portion forming a cavity between the middle portion of the bladder and the flex tubing with an air passage to the cavity, the sleeve carrier having an air supply connect or that connects to an air supply to provide pressurized air to the cavity through the passage to inflate the bladder.

The present invention relates to rack contractor, and is especially a conic sleeve type cylindrical netted isodiametric rack contractor. The conic sleeve type cylindrical netted isodiametric rack contractor includes conic sleeve with N equant guide conic tracks with sector block each, and driving unit connected to the conic sleeve, and the N guide conic tracks constitute one frustum with one large end and one small end. One conic mechanism with only radial force on the contracted rack is designed based on the mechanical features of cylindrical netted rack structure so as to alter the diameter continuously at will for isodiametric rack contraction.

The invention discloses a phase-change energy storage device. The phase-change energy storage device comprises a heat conduction piston cavity, a phase-change unit, a heat conduction piston, a limiting ring, a first spring, a heat conduction cap and a heat sink; the piston cavity and the heat sink are oppositely arranged on the front surface and the rear surface, the heat sink is arranged in front of the piston cavity, the front end of the piston cavity is open, and the rear end of the piston cavity is sealed; the piston is in sliding fit in the piston cavity, and the piston is in dynamic sealing with the inner wall of the piston cavity; the phase-change unit is filled in a cavity defined by the end part of the rear end of the piston and the piston cavity, the limiting ring is fixedly connected with the inner wall of the front end of the piston cavity, and the first spring is arranged between the limiting ring and the piston; and the two ends of the first spring are respectively abutted against the limiting ring and the piston, the heat conduction cap is connected with the front end of the piston, the front end of the heat conduction cap penetrates out of the piston cavity, and the heat sink is arranged in front of the heat conduction cap. The phase-change energy storage device can dissipate heat generated by high-power equipment on the basis of keeping a small size, the problem of thermal control of the high-power equipment on a satellite is solved, and normal operation of the equipment is guaranteed.

The conic perforator includes frame, upper cover, base seat, two rotating drums inside the frame, two rollers installed separately on the two rotating drums, guide plate its regulator. The frame is one cylinder cast integrally with low expansion coefficient metal. The guide plate regulator is locked via inclined wedge on the frame. The distance between the guide plate and the central line is regulated via a motor driven horizontal screw elevating mechanism. The integral cylindrical frame of the conic perforator has less material consumption, strengthened rigidity, reasonable stress state and homogeneously distributed radial stress.

The invention discloses a slips mechanism for manufacturing a sand prevention screen pipe and a clamping method. The slips mechanism comprises a slips rack, wherein two parallelly arranged slide bars are arranged on the slips rack; a first slips plate and a second slips plate are sleeved on the slide bars; a first slips piece is connected onto the first slips plate; a second slips piece is connected onto the second slips plate; the second slips plate is connected with two parallelly arranged connecting rods; the other ends of the two connecting rods penetrate through the first slips plate and the slips rack so as to be connected with an air cylinder fixing plate; the air cylinder fixing plate is connected with the cylinder body of an air cylinder; and a piston rod of the air cylinder penetrates through the slips rack so as to be connected with the first slips plate. The slips mechanism for manufacturing the sand prevention screen pipe can be used for effectively clamping an objected to be clamped.

The invention provides a linkage compressing mechanism. The mechanism comprises input shafts, bearing pedestals, compressing devices, a limiting plate fixing device and a controller. The linkage compressing mechanism has the advantages of being simple in structure, reliable in action, low in cost and easy to expand. The compressing devices are symmetrically distributed on the input shafts at the two ends of a second bearing pedestal, loads are symmetric, radial stress is uniform, and steering and transmission are reliable. Through connection of the input shafts and the four compressing devices, the linkage compressing function is achieved, a complex control mechanism is not needed, the part number is reduced, the linkage compressing mechanism is small in size, distance sensors are arrangedon pressing plates, the input shafts are rotated, after the compressing devices carry out compressing action, the sensors send out feedback signals of making contact with the compressing parts, the controller drives the limiting plate fixing device to compress an angular limiting plate according to the feedback signals, position changes of the input shafts are prevented, and the function of compressing state locking is achieved.

The invention discloses a leak-free sleeve suspending device. The device comprises a sealing socket, sealing rings, a slip, and a slip seat which are connected by taking a sleeve as a shaft. The sealing socket is connected with the slip seat through a bolt; an inner conical hole of the slip seat is in taper fit with an outer wall of the slip; and tooth grooves are uniformly distributed on the inner wall of the slip to form a sleeve suspending slip limiting structure. A sealing structure into which the sealing rings are embedded is arranged in an inner hole, matched with the sleeve, of the sealing seat. In the leak-free sleeve suspending device, the slip consists of four to six equal tegular blocks; and a split slip is axially limited by a limit ring, and a radial screw hole installation screw which is uniformly distributed in the waist part of the slip seat locks the limit ring. During actual use, the bolt is adjusted, then the slip is accurately placed in the inner conical hole of the slip seat, radially applied force is uniform, and the wall of the suspended sleeve is not deformed, so that the sealing performance of the sealing structure at the upper end is not influenced. The sleeve is suspended reliably, and sealed strictly; and any resin implantation operation is not required during use, the safety performance of a product is greatly improved, and using cost is reduced directly. The leak-free sleeve suspending device is suitable for sleeves with different calibers.

The invention relates to the field of compressors, in particular to a two-stage air suspension centrifugal compressor capable of reducing radial force. The two-stage air suspension centrifugal compressor comprises a motor shell, a motor shaft, an air bearing device, a first volute, a first impeller, a second volute and a second impeller. Each volute body is provided with a partition tongue, a first spiral section, a second spiral section and a diffusion section, wherein the first spiral section starts from the partition tongue and ends at the intersecting line of the diameter of a volute base circle in the vertical direction and the volute body. Each partition plate is provided with a spiral section and a horizontal section, wherein the spiral section is the same as the corresponding first spiral section in shape and is in central symmetry with the corresponding first spiral section relative to the volute base circle, and the horizontal section is tangent to the spiral section and is distributed in the horizontal direction. According to the compressor, the partition plates are arranged in the volutes to divide volute chambers into the inner volute chambers and the outer volute chambers, and it is guaranteed that airflow at outlets of the volutes is stable; and the spiral sections which are the same as the first spiral sections in shape and is in central symmetry with the first spiral sections relative to the volute base circles are arranged on the partition plates, so that radial stress of the volutes is more uniform.

The invention discloses an active piston phase modulation and power recovery integrated pulse tube refrigerator supported by a column spring. A shock absorber, an active phase modulation and piston power recovery mechanism, a compressor and a cold finger of the refrigerator are arranged on the same axis, and an active phase modulation piston shaft penetrates through an inner hole of a compression piston and is connected with a refrigerator shell through a phase modulation piston column spring. A compressor motor and an active phase modulation piston motor both adopt moving coil type linear motors, so that the radial vibration is small. The compression piston and the active phase modulation piston both adopt gas bearings, the compression piston is supported by a single-side column spring, and the active phase modulation piston is used for recovering expansion work and improving the efficiency of the refrigerator. Two displacement sensors are arranged to monitor the displacement of the active phase modulation piston and the displacement of the compression piston correspondingly, the phase between the compression piston and the active phase modulation piston is adjusted through the active phase modulation piston motor, and efficient operation of the refrigerator is guaranteed. The refrigerator has the advantages of compact structure, low vibration, work recovery and high refrigeration efficiency.

The biomedical engineering device is provided with one main body with n guide tracks, n quadrant blocks, conjugated gears, control pin and other parts. The conjugated gears can rotate clockwise or counterclockwise to make the n quadrant blocks move synchronously and centripetally or centrifugally. The biomedical engineering device has also pallet, spring, distance ring, etc. The present invention has been applied practically.