69results about How to "Enhance the dynamic pressure effect" patented technology

The invention discloses a liquid lubricated end face seal structure with a cross-scale surface texture characteristic, which comprises a moving ring and a static ring of a mechanical seal; and one side of an end face of the moving ring/static ring is a high pressure side, namely an upstream, while the other side is a low pressure side, namely a downstream. The liquid lubricated end face seal structure is characterized in that: a plurality of cross-scale texture face grooves are processed on the end face of the moving ring or the static ring of the mechanical seal; each cross-scale texture face groove consists of a millimeter deep groove and micrometer micropores; the deep groove is positioned at the upstream of the end face; the micropores are distributed on the periphery of the deep groove; seal weirs are arranged between the cross-scale texture face grooves; and a downstream of each cross-scale texture face groove is provided with an annular seal dam of a non-opened face groove. The liquid lubricated end face seal structure has the advantages of improving seal lubrication, improving the rigidity of a fluid film and the pressure and heat resistance of the mechanical seal, greatly strengthening the operational reliability, stability and leak tightness of the seal, and prolonging the service life of the seal.

The invention relates to a double-row tilting directional microporous end surface no-leakage mechanical sealing structure, comprising a dynamic ring and a static ring which are sealed mechanically, wherein one side of the end surface of the dynamic ring or the static ring is an high-voltage side, namely an upstream part, and the other side thereof is a low-voltage side, namely an downstream part,the end surface of the dynamic ring or the static ring is provided with an outer microporous ring belt and an inner microporous ring belt; microporous long shafts of the outer microporous ring belt and the inner microporous ring belt are opposite to the direction of a tilting angle of the diameter of the sealing end surface passing through the center of the micropore; the outer microporous ring belt and the inner microporous ring belt are respectively arranged on the upstream part and the downstream part of the end surface; and a continuous ring-shaped sealing dam are respectively arranged between the outer microporous ring belt and the inner microporous ring belt and the downstream part of the inner microporous ring belt. The mechanical sealing structure has the beneficial effects of: realizing no contact, wear resistance and no leakage of sealing, prolonging the service life and improving the sealing reliability.

The invention relates to a mechanical sealing structure of a pearl-row-like annular groove zoning end face, comprising mechanically sealed rotating rings and static rings. The end face of at least one of the sealed rotating rings and the static rings is provided with pearl-row-like annular zones, and the pearl-row-like annular zones are composed of a plurality of annular grooves, and are distributed symmetrically to a rotating center, each annular groove is arranged round a circular convex table, annular sealing dams are arranged inside and outside the end face, and the annular grooves on thesame annular zones are communicated through circumferential arc grooves. The mechanical sealing structure of the pearl-row-like annular groove zoning end face has the advantages of good wearing resistance, low-speed low-pressure starting and dynamic pressure, and can be applied to seal common liquid and gases.

The invention provides a dynamic-static pressure combined type asymmetrical waviness end face fluid mechanical sealing structure. At least one sealing end face on a moving ring and a stationary seal ring is provided with more than two three-dimensional asymmetrical waviness appearances, the asymmetrical waviness is in a periodical arrangement on the at least one sealing end face, the asymmetrical waviness sealing end face comprises a dam area, a conical surface and a wave crest and a wave trough of the asymmetrical waviness, the dam area is a groove-less parallel annular sealing dam arranged at the low-pressure side, the wave crest and the wave trough are connected through the conical surface, the conical surface is a linear convergence cone formed from the high-pressure side to a low-pressure side and is connected with the dam area, the conical surface can realize sealed non-contact static pressure effect; the conical degree combines with the asymmetrical waviness so that the sealing reliability can be improved, an asymmetrical waviness smooth transition curve can prevent the particles in the sealing fluid from being cumulated, and the dam area can realize static sealing when the axle is stationary. The structure provided by the invention has strong pressure resistance and antijamming capability, the leakage rate is lower at the conditions of high parameters, the fluid has good dynamic pressure effect in the process of start and stop and the fluid bearing capacity is sufficient in the normal operation.

The invention discloses a mechanical sealing structure with the end face being provided with vein-shaped grooves. The front end face, namely the sealing face, of the mechanical sealing structure is composed of an outer ring (1), an inner ring (2), a sealing weir area (3), a sealing dam area (4) and the 6-12 vein-shaped grooves (5) which are all located in the different positions of the front end face, namely the sealing face, of the mechanical sealing structure. The number of the vein-shaped grooves (5) is changed along with the size of the mechanical sealing structure. Each vein-shaped groove (5) is composed of a first branch groove body (51), a second branch groove body (52), a third branch groove body (54), a fourth branch groove body (55) and a main groove body (53). The hydrodynamic pressure effect is effectively improved, the side effect caused by unevenness of the mechanical sealing end face is reduced, and the working efficacy of mechanical sealing is improved; and the rub-impact failure under the extreme working conditions of the small film thickness and the small pressure difference can be effectively avoided, non-contact sealing is achieved, abrasion resistance is improved, the service life is prolonged, and sealing reliability is improved.

The invention provides a non-contact mechanical seal ring with dual-rotating-direction hydrodynamic grooves. Hydrodynamic groove structure units in same forms are arranged on the outer side of a seal end face circumferentially at equal intervals; the hydrodynamic groove structure unit is in a wing-shaped structure formed by a central groove and same wing grooves which are connected to two sides of the central groove respectively and which extend symmetrically in a converged manner; the central groove and two wall edges thereof are two radial extending segments of the seal end face respectively, the wall edge on the inner side is an arc concentric with the seal end face, and the central groove is formed in the circumferential wall of a seal ring body, long side edges of two sides of the wing grooves and short grooves at the converged-extending ends are two radial extending segments of the seal end face; the long side edges of two sides of the wing grooves fit and are connected with the side wall of the central groove where the same located. By the aid of the hydrodynamic groove structure, seal hydrodynamic effect can be improved, seal end face opening force is increased, thickness and strength of the fluid film between the seal end faces are increased, seal leakage is reduced, groove processing difficulty is reduced, and process requirements on seal parts processing and assembling are lowered.

The invention discloses a circumferential sectioned helium sealing device for an oxygen turbine pump of a hydrogen oxygen engine. According to the circumferential sectioned helium sealing device, a circumferential sectioned sealing ring I and a circumferential sectioned sealing ring II are placed in a cavity formed by a cover plate and a sealing shell; sealing shaft sleeves are placed in rings of the circumferential sectioned sealing ring I and the circumferential sectioned sealing ring II; the circumferential sectioned sealing ring I and the circumferential sectioned sealing ring II are oppositely placed and pre-tensioned by virtue of pre-tensioning springs; and each of the circumferential sectioned sealing ring I and the circumferential sectioned sealing ring II is formed by connecting a plurality of fan-shaped arc sections with the same structure end to end, and constrained on an excircle surface through garter springs. According to the circumferential sectioned helium sealing device, each sealing ring is composed of the plurality of fan-shaped arc sections, a hydrodynamic groove structure is introduced, and a hydrodynamic effect of a sealing clearance fluid is adequately utilized, thus the helium sealing device reliably works under an extremely small clearance, and a low leakage amount is maintained.

The invention provides a pulse hydraulic fracturing device and method based on a continuous rotary valve. The pulse hydraulic fracturing device based on the continuous rotary valve is composed of a water tank, a water injection pipeline, a water pump, a pressure relief pipeline, the continuous rotary ball valve, a hydraulic motor and the like. According to the pulse hydraulic fracturing method based on the continuous rotary valve, stable pulse water pressure is generated in the water injection pipeline through periodical opening and closing of the continuous rotary ball valve, and a novel technical approach is provided for dynamic hydraulic fracturing of coal rocks. After the continuous rotary ball valve is connected into the water injection pipeline, a valve element of the continuous rotary ball valve is driven by the hydraulic motor to rotate, the valve is opened and closed continuously and stably, the periodical water hammer effect is formed in a water path injected into a coal rock body, and the pulse water pressure is generated; and the continuous rotary ball valve is improved, when the improved continuous rotary ball valve is closed, high-pressure water in the coal rock body can decrease the pressure actively, the vibration amplitude of the pulse water pressure is increased, and the technical effect of hydraulic fracturing is improved.

The invention provides a surface lubricating texture, compressor parts, a compressor and an air conditioner. The surface lubricating texture comprises a dynamic pressure lubricating surface (1), a hole structure is arranged one the dynamic pressure lubricating surface (1), and the hole structure is arranged in a flowing direction of fluid; the hole structure comprises first hole (2) and second hole (3); the first holes (2) and the second holes (3) are arranged at intervals, and the hole depth of the first holes (2) is smaller than the hole depth of the second hole (3). According to the surfacelubricating texture provided by the invention, long-term oil storage and oil returning functions are met while sufficient fluid dynamic pressure effect can be provided, the reliable and stable operation and long-service-life requirements of a friction pair are effectively ensured.

The invention discloses a novel active air foil bearing based on PZT and SMA. The novel active air foil bearing comprises a shaft sleeve, piezoelectric ceramics (PZT), a memory alloy wire mesh block (SMA block), flexible hinges, a rigid push rod, pre-pressure applying devices, a cooling pipe, a wave foil and a top foil; the PZT and the SMA block are installed in pre-machined through grooves, the corresponding pre-pressure applying devices are designed for the PZT and SMA block, the wave foil is formed by pressing an elastic material, one end of the wave foil is welded, and the other end of thewave foil is free. The top foil overlies the wave foil. Power supply signals of the PZT are controlled, the flexible hinges are coupled, PZT deformation is amplified, the wave foil is supported by the rigid push rod, the wedge-shaped space is enlarged, therefore, the crossed coupling effect is weakened, the dynamic pressure effect of the bearing is enhanced, and the rigidity characteristic of thebearing is improved; by controlling the temperature of the SMA block, the SMA block expands and contracts to generate larger structural damping, and the damping characteristic of the bearing is improved; and finally, the rigidity and damping characteristics of the bearing are actively controlled, and the stability of the system is improved.

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 power high efficiency grinding head belongs to an excircle grinding head. A main shaft (3) is mounted in an eccentric sleeve (4); a dynamic and static pressure front bearing (1) is mounted at the front end between the eccentric sleeve and the main shaft; the rear end is equipped with a dynamic and static pressure rear bearing (6) and a roll push bearing (7). All the components are mounted in a grinding rack housing (5). The front end of the eccentric sleeve (4) is equipped with a taper sleeve. The rear end of the main shaft (3) is equipped with a belt wheel (8). The structure format of the dynamic and static pressure beating oil chamber is that an upper chamber (9) is the static pressure, a lower chamber (11) is the static pressure, a front chamber (10) is the static pressure and a rear chamber (12) is the dynamic pressure. This invention improving the own rigid and the interference rejection of the grinding head is suitable for the power grinding so as to improve the grinding efficiency of the roller and the surface macroscopic quality of the roller, and to realize the grinding effect of machining-less of the middle and high rollers with the surface roughness concentration of Ra 0.03, and it is suitable for the excircle surface of the grinding roller.

The invention discloses a novel active air foil bearing. The bearing comprises a shaft sleeve, the PZTs, the flexible hinges, rigid push rods, precompression exertion devices, wave foil and top foil; the shaft sleeve is machined through wire cutting, three PZT mounting through grooves circumferentially and evenly distributed, the corresponding flexible hinges and the corresponding rigid push rods are obtained, the top ends of the rigid push rods are flush with the inner cylindrical face of the shaft sleeve, the PZTs are mounted in the through grooves, the corresponding precompression exertion devices are designed for the PZTs, the wave foil is formed by pressing of elastic materials, and is arranged on the shaft sleeve and the inner cylindrical faces of the rigid push rods, one end of the wave foil is welded to the inner round face of the shaft sleeve, and the other end of the wave foil is free. The top foil is arranged on the wave foil in a covering manner. Through control over power supply signals of the PZTs, the PZTs mechanically deform, the flexible hinges are enlarged to deform, and are supported through the rigid push rods to be attached to the wave foil on the push rods and the inner wall of the shaft sleeve, a gap between a bearing and a supporting rotor is changed, the wedge space is increased, the crossed coupling effect is weakened, the bearing dynamic pressure effect is enhanced, the rigid characteristic of the bearing is improved, and finally the aims of actively controlling the rigidity characteristics of the bearing and improving the stability of the bearing are achieved.

The invention discloses an intelligent hybric bearing based on a negative-poisson-ratio structure. The intelligent hybric bearing comprises a main shaft, a bearing body and an oil inlet device. The bearing body is arranged on the main shaft in a sleeving manner. An installation hole is formed in the bearing body. The oil inlet device is installed in the installation hole. A first static pressure cavity and a second static pressure cavity which communicate with each other are formed in a bearing face of the bearing body. The oil inlet device is connected with the second static pressure cavity through an oil inlet formed in the bottom of the installation hole. The negative-poisson-ratio structure is adopted in the oil inlet device for achieving oil supply adjustment. According to the intelligent hybric bearing based on the negative-poisson-ratio structure, a specific stretching effect of the negative-poisson-ratio structure is utilized, bearing vibration and eccentricity can be effectively reduced, and therefore the movement precision is improved; and meanwhile, the dependency on bearing clearances under the high-speed work condition is lowered, and the problems that a traditional high-precision hybrid bearing is difficult to machine and likely to be blocked are solved.

The invention discloses an end-surface mechanical seal structure with a sharkskin-imitated surface three-dimensional shape. The end-surface mechanical seal structure comprises a moving ring or a fixed ring as mechanical seal, wherein the outer ends of the seal end surfaces of the moving ring and the fixed ring are taken as high-pressure sides, namely upstream parts, and the inner ends of the seal end surfaces are taken as low-pressure sides, namely downstream parts; a circle of closed seal dam is arranged at the upstream high-pressure side of at least one seal end surface in the moving ring or the fixed ring, a plurality of upstream pump grooves are uniformly arranged on the circumference of the surface of the seal end surface, a first end of each upstream pump groove extends to the high-pressure side of the seal end surface, and a second end extends to the low-pressure side of the seal end surface; an area between two adjacent upstream pump grooves is a seal weir; micro convex body clusters with the sharkskin-imitated surface shape are processed on the bottoms of the grooves and the surfaces of the seal weirs; the micro convex body clusters are arranged in a staggered manner until the micro convex body clusters uniformly bestrew the whole seal weirs and the bottoms of the upstream pump grooves; and the micro convex body clusters are formed by a plurality of parallel micro convex body units. The end-surface mechanical seal structure has the beneficial effects that attachment, drag reduction, wear resistance and enhanced heat dissipation of marine fouling organisms are prevented through the sharkskin-imitated surface three-dimensional shape.

The invention relates to a novel static-ring structure of a mechanical sealing device, which mainly solves the technical problems of improving lubricant conditions of primary and secondary seals and the like. The adopted technical scheme is that upper and lower working surfaces of upper and lower static-ring bodies of a split static-ring comprise upper and lower planes and upper and lower inclined planes; the upper and the lower planes are located at outer edges of the upper and the lower inclined planes; a group of upper and lower U-shaped flumes are arranged at the upper and the lower static-ring bodies along the circumferential direction; and the upper and the lower U-shaped flumes are located on the upper and the lower working surfaces and located at inner sides of the upper and the lower planes. The structure provided by the invention is suitable for the sealing of various marine stern tubes.

The invention belongs to the technical field of main shaft system design, and discloses a transcritical main shaft system design method based on multi-scale interface regulation and control. The method comprises the following steps: giving multi-scale interface parameters; establishing a film thickness equation to obtain a film thickness value of each point of the liquid film; calculating the pressure value of each point of the liquid film to obtain oil film force; calculating a stiffness matrix and a damping matrix of the bearing; solving the axis trajectory motion equation to obtain a spindle vibration quantity; judging whether the spindle vibration quantity meets requirements or not; if not, giving a value interval of the multi-scale interface parameters, resetting the parameters in the given value interval of the multi-scale interface parameters, and performing iterative calculation again; and if yes, outputting the parameters of the multi-scale interface. Through collaborative optimization of deep and shallow cavity interfaces and texture interfaces of the bearing, a functionalized multi-scale interface is formed, the dynamic stability of a main shaft system can be remarkably improved, vibration of the main shaft system is restrained, and the main shaft system can safely and stably work in a critical rotating speed range.

A mechanical seal end face structure of imitated grinding disc texture comprises a movable ring and a fixed ring which are in mechanical seal; one side of each of the movable ring and the fixed ring serves as the high-pressure side, that is the upstream side, the other side of each of the movable ring and the fixed ring is the low-pressure side, that is the downstream side, multiple streamline grooves of the imitated grinding disc surface texture are evenly distributed in the end face of at least one seal ring of each of the movable ring and the fixed ring in the circumferential direction, composed of foundation movable pressure grooves and flow guide grooves, and gradually narrowed from upstream to downstream and become shallow in depth; the foundation movable pressure groove are arranged in parallel in a multi-row manner, and the grooves are partitioned by sealing weirs with the equal depth; the flow guide grooves penetrates the foundation movable pressure grooves, and seal dams are arranged on the downstream portions of the streamline grooves; through the convergent structure of the imitated grinding disc texture, the higher flow guide effect is achieved, and leakage is reduced while the end fluid movable pressure effect is improved.