31results about How to "Enhanced hydrodynamic effect" patented technology

The present disclosure concerns the application of the “Wave Bearing Concept” to journal and thrust fluid film bearings to increase performance and reliability. The wave surface is present on whichever member is stationary or non-rotating. Some applications are: pressurized gas journal wave bearings for increased load capacity and dynamic stability; journal wave bearings with liquid lubricants for extreme load capacity and excellent thermal and dynamic stability under any load; thrust wave bearings for axial positioning and axial loads; journal bearings with an elastic wave sleeve that can be activated via actuators (“active/passive control fluid film bearing”) or may change by itself (“smart bearings”) to adapt the bearing performance to the applied bearing load and speed. Journal and thrust bearings incorporating the present invention are appropriate for either mono-directional or bi-directional rotation.

The invention relates to a non-contact mechanical end surface sealing structure, which comprises mechanical sealed movable ring and stable ring. While the end surface of stable or movable ring has micro groove and porous zone that symmetry according to the rotational center. Wherein, said zone is at the ascending part of end surface and the micro groove is at the descending part, which has a circular sealing dam beside it. The invention can be used in variable mediums to increase the ability of solid particle, the static pressure property, fluid dynamic pressure property and the pump adsorption property, to attain better sealing effect, with long service life.

A bilaterally rotatable end surface mechanical sealing structure with dovetail grooves comprises two mechanical sealing rings including a movable ring and a fixed ring. A plurality of bilaterally rotatable dovetail grooves are arranged on end surfaces of at least one of the movable ring and the fixed ring and are circumferentially distributed along the end surfaces of the movable ring or the fixed ring, each dovetail groove comprises a pair of spiral grooves and an arc groove, the spiral grooves of each dovetail groove are reverse to each other, roots of the spiral grooves of each dovetail groove are connected with each other by the corresponding arc groove, so that each profiled groove with the shape similar to a dovetail is formed, each spiral groove is positioned on a high-pressure side, namely the upstream, each arc groove is positioned on a low-pressure side, namely the downstream, and directions of spiral angles of the spiral grooves which are reverse to one another correspondingly are opposite to one another.

The invention belongs to the technical field of mechanical seals, and provides a dry gas seal device to solve the problems that when a current dry gas seal is applied to high-temperature large-amplitude vibration equipment, an auxiliary seal O-type ring of a compensation ring is likely to deform due to high temperature, and the compensation ring and an active ring are likely to rub. The dry gas seal device comprises a seal support, a pressure spring, a floating ring, a rotary shaft, a shaft sleeve and a locating pin. Bearings are arranged in the middle of the seal support, and the rotary shaft is assembled on the bearings. Spiral grooves, tables and dams are arranged on the outer wall of the shaft sleeve, and the shaft sleeve is arranged on the rotary shaft. The floating ring is located in the seal support and arranged on the shaft sleeve in a sleeving manner. One end of the floating ring and the seal support are circumferentially fixed through the locating pin, and the other end of the floating ring is connected with the pressure spring. The dry gas seal device is good in opening characteristic, high in gas film rigidity, stable in running and capable of adapting to shaft end seals of the high-temperature large-amplitude vibration equipment.

The invention discloses a profiled groove end surface non-contact mechanical seal with a backflow function. The profiled groove end surface non-contact mechanical seal comprises a mechanical seal moving ring and a mechanical seal static ring, wherein one side of the end surface of each of the moving ring and the static ring is a high-pressure side, i.e. an upstream; the other side of the end surface of each of the moving ring and the static ring is a low-pressure side, i.e. downstream; the downstream of the end surface is provided with an annular sealing dam of a smooth plane; and at least one sealing end surface in the moving ring and the static ring is provided with a plurality of groups of fluid profiled grooves. The profiled groove end surface non-contact mechanical seal with a backflow function is characterized in that the fluid profiled groove is formed by compounding the drainage groove and a pumping reflux groove, wherein the average groove depth of the drainage groove is more than the average groove depth of the pumping reflux groove; the drainage groove is arranged on the upstream of the end surface and is communicated with sealing medium; the pumping reflux groove is the profiled groove with the appearance structure characteristic of a flying bird wing; the groove depth is in the variation rule that the middle is deep and two sides are shallow; and the tail ends of two sides of the pumping reflux groove has a certain space with the upper stream of the end surface. The profiled groove end surface non-contact mechanical seal has dual actions of upstream pumping and downstream pumping to the sealing medium, the leakage amount is reduced, and the operation reliability of sealing is improved.

The invention relates to a tilting directional microporous end surface mechanical sealing structure comprising a dynamic ring and a static ring which are sealed mechanically, one side of the end surface of the dynamic ring and the static ring is a high-voltage side, namely, an upstream part, and the other side thereof is a low-voltage side, namely, a downstream part; the end surface of the dynamicring or the static ring is provided with a microporous ring belt which is arranged on the upstream part of the end surface; the downstream part of the microporous ring belt is provided with a continuous ring-shaped sealing dam; and a long shaft of the micropore forms a tilting angle with the diameter of the sealing end surface passing through the center of the micropore. The tilting directional micropore end surface mechanical sealing structure has the beneficial effects of: greatly improving hydrodynamic effect of the microporous end surface, leading the sealing to have good starting-stopping effect under low-voltage condition, being capable of being applied in a liquid medium and a gas medium by setting the depth of the micropore, being capable of fully exerting the capabilities and advantages of microporous solid particles, realizing no contact, wear resistance and no leakage of sealing, prolonging the service life and improving the sealing reliability.

The invention relates to an upstream pumping machinery sealing ring with multiple stages of helical grooves. The multiple stages of helical grooves uniformly distributed along the circumference of the end surface are formed in the end surface; openings of the multiple stages of helical grooves are formed in the low pressure side of the end surface; the circumferential width and the depth of each stage of helical groove are gradually decreased from the low pressure side to the high pressure side, thus overall forming convergent gaps and greatly enhancing the hydrodynamic pressure effect of the end surface; and therefore, the friction resistance of a machinery seal in an operation process is reduced, and the service life is greatly prolonged.

A prosthetic hard-on-hard orthopaedic hip joint comprising a femoral head with a diameter of approximately 40 mm and a dimpled surface, an acetabular cup with a diameter such that the diametric clearance is less than or equal to 50 μm, a sphericity less than 10% of the diametric clearance, a composite surface roughness less than 20 nm, and a femoral stem integral to said femoral head.

The invention discloses a mechanical seal end face structure of a variable-depth spiral T-shaped groove. The structure comprises a mechanical seal movable ring and a mechanical seal static ring, wherein one side of the end face of the movable ring or the static ring is provide with a high-pressure side, namely an upstream side, and the other side of the end face of the movable ring or the static ring is provide with a low-pressure side, namely a downstream side; variable-depth spiral T-shaped grooves are formed in the end face of the movable ring, seal weirs are arranged among the variable-depth spiral T-shaped grooves, the variable-depth spiral T-shaped grooves communicate with a circumferential annular groove, and a seal dam is arranged between the circumferential annular groove and thedownstream side; and the number of the variable-depth spiral T-shaped grooves is an even number in 8 - 24, and the radial width of the whole variable-depth spiral T-shaped grooves accounts for less than one third of the radial width of the whole seal end face. According to the mechanical seal end face structure of the variable-depth spiral T-shaped groove, the fluid dynamic pressure effect is effectively improved, the working efficiency of mechanical seal is improved, and the sealing performance of the mechanical seal in a static state is ensured; and solid particles and the like can be timely discharged out of the seal end face, so that the friction between end surfaces is reduced, the temperature distribution is improved, and the problems of deformation and even mechanical seal end surface cracking caused by uneven heating of a seal ring are avoided.

The invention discloses a low-leakage fingertip seal structure for increasing lift force of a sealing shoe. The low-leakage fingertip seal structure comprises a front baffle, a high-pressure sealing piece, a low-pressure sealing piece and a rear baffle which are sequentially connected through rivets from the high-pressure side to the low-pressure side. The low-pressure sealing piece comprises a fingertip beam, the sealing shoe and a shoe tip small wing. The sealing shoe is vertically connected to the bottom end of the fingertip beam and extends towards the low pressure side, a sealing gap is formed between the lower portion of the high-pressure sealing piece and the outer surface of a rotor, a sealing gap is formed between the bottom of the sealing shoe and the outer surface of the rotor, the shoe tip small wing is arranged on the side, axially close to the low-pressure area, of the sealing shoe, and the shoe tip small wing extends outwards in the radial direction of the rotor. According to the low-leakage fingertip seal structure for increasing lift force of the sealing shoe, the fluid dynamic pressure effect of the non-contact type fingertip seal is enhanced through the shoe tip small wing, the lift force of the sealing shoe is improved, the fingertip beam bounces along with a rotor and has better following performance, abrasion to the sealing shoe due to rotor bounce is reduced, the service life of the fingertip seal is prolonged, and the sealing character of the fingertip seal is improved.

The invention discloses a composite textured surface for a radial sliding bearing. The composite textured surface is arranged on the inner surface of a bearing bush. According to the composite textured surface, composite textures are distributed at an inlet of the radial sliding bearing and are composed of at least two textures in different shapes, the textures in different shapes are alternately arranged and are distributed in a rectangular matrix mode, the overall width of the composite textures accounts for one third of the length of the bearing, the area density of the textures is 5%-15%, the depth of the textures is 5-30 micrometers, and the areas of the textures in different shapes are equal. The composite textured surface has the advantages that the tribological performance of the radial sliding bearing is favorably improved, the fluid dynamic pressure effect which is more remarkable compared with that of a smooth bearing surface and a single-shape bearing surface is generated, lower friction force and higher bearing capacity are obtained, the oil film thickness of a friction matching pair is effectively increased, the possibility of oil film (direct metal contact) fracture is reduced, and the service life of the radial sliding bearing is prolonged.

A ternary distortion-type groove end surface mechanical sealing structure comprises a dynamic ring and a static ring which are used for mechanical sealing, ternary distortion-type grooves 1 evenly distributed in the circumferential direction are machined in the sealing end surface of at least one sealing ring of the dynamic ring and the static ring, and each ternary distortion-type groove is formed by two side walls and a three-dimensional distortion variable-depth groove bottom surface; the side walls of each ternary distortion-type groove comprise the windward side ternary distortion wall surface 11 and the leeward side ternary distortion wall surface 13, and the three-dimensional distortion variable-depth groove bottom surfaces 12 gradually shallow in a distortion shape from the outer circumferential side walls of the sealing rings to the centers of the sealing rings and intersect with the sealing end surfaces on the outer sides of sealing dams 3; the intersection lines of the side walls of the ternary distortion-type grooves 1 and the outer circumferential side walls of the sealing rings are perpendicular to the sealing end surfaces; the intersection lines of the side walls of the first ternary distortion-type grooves and the sealing end surfaces are each divided into two sections, the intersection lines on the medium inlet sides are helical lines, and the intersection lines on the medium leakage sides are radial straight lines.

The serial arc groove type bidirectional rotary sealing end face structure comprises a static ring and a movable ring, the static ring and the movable ring are each provided with a sealing end face, the outer ring edge of each sealing end face is a sealing high-pressure side, the inner ring edge of each sealing end face is a sealing low-pressure side, and an annular sealing dam is arranged on the sealing low-pressure side of each sealing end face. A plurality of serial arc dynamic pressure groove sets are evenly distributed in the sealing end face in the circumferential direction of the sealing end face, each serial arc dynamic pressure groove set comprises a plurality of concentric arc grooves, the two ends of each arc groove are communicated with the sealing high-pressure side, and arc-shaped recesses of the arc grooves face the sealing high-pressure side. The invention has the following beneficial effects: the rigidity of a fluid film on the sealing end surface is improved, the sealing operation stability is improved, and a reverse rotation operation condition is provided.