310 results about "Lip seal" patented technology

The invention discloses a cabin-penetrating cable sealing assembly with a combined rubber ring, and relates to the field of cable cabin-penetrating sealing, and the cabin-penetrating cable sealing assembly comprises a cabin-penetrating pipe body and at least one sealing ring assembly. The cabin penetrating pipe body is provided with a pipe cavity which extends in the axial direction and allows a cable to penetrate through. The pipe cavity is divided into an in-cabin section and an out-cabin section. The sealing ring assembly comprises a set of lip-shaped sealing rings, lips of the set of lip-shaped sealing rings face the outside of the cabin, the in-cabin section is filled with the lip-shaped sealing rings in an overlapped mode in the axial direction, the cable is sleeved with the lip-shaped sealing rings, and the lip-shaped sealing rings comprise a main sealing ring and an auxiliary sealing ring. The gap between the cable and the cabin penetrating pipe body is filled with the main sealing ring. The auxiliary sealing ring fills a gap between the cable and the cabin penetrating pipe body, and the auxiliary sealing ring and the main sealing ring are arranged in an overlapped mode. The elasticity of the auxiliary sealing ring is smaller than that of the main sealing ring, and the abrasion resistance of the auxiliary sealing ring is larger than that of the main sealing ring. The cabin-penetrating cable sealing assembly with the combined rubber ring is high in sealing reliability.

The utility model discloses a conductive combined seal, which comprises a metal conductive oil seal, a single-lip seal and a metal framework, the metal conductive oil seal and the single-lip seal are both buckled on the metal framework, and an oil seal spring for performing radial force compensation on a lip is arranged on the inner side of the metal conductive oil seal. An oil seal lip is arranged at the upper end of the outer side of the metal conductive oil seal, a dustproof lip is arranged at the lower end of the outer side of the metal conductive oil seal, a sealing lip is arranged at the end of the outer side of the single-lip seal, and a copper net is clamped in the sealing lip. The bearing can improve the sealing reliability, has a multi-lip sealing effect, and has the characteristics of strong internal and external power-on function, reduction of electric corrosion in the bearing, strong external medium prevention function and prevention of the interior from being polluted by external impurities.

The invention relates to a sealing structure, in particular to a combined sealing structure for an output shaft of a marine gearbox. The problem that an existing sealing component can cause leakage under the conditions that an output shaft is static, low in speed, large in lubricating oil amount, too large in oil pressure and the like is solved. A three-stage combined sealing structure is formed by the oil slinger, the labyrinth sealing ring and the lip-shaped sealing assembly. The oil slinger arranged on the output shaft is simple in structure, convenient to transform and good in economical efficiency. The labyrinth sealing ring not only can meet the sealing requirement of a rotating part, but also has self-adaptive flexural deflection, and can be automatically adjusted in a limited manner, so that a good sealing effect is achieved. The lip-shaped sealing assembly structurally achieves the bidirectional sealing effect, internal lubricating oil can be sealed, and water, dust, silt and other external impurities are prevented from entering the gearbox. Through the application of the combined sealing structure, leakage is reduced step by step. The invention belongs to the technical field of gearbox sealing.

The invention belongs to the technical field of positive displacement vacuum pumps, and particularly relates to a sealing mechanism of a vacuum pump, which comprises a labyrinth seal and a piston ring seal, the left and right sides of the labyrinth seal and the piston ring seal in the axial direction are respectively provided with an oil cavity and a pump cavity; the radial inner and outer sides of the labyrinth seal and the piston ring seal are respectively provided with a rotor shaft in a pump cavity and an oil tank side sealing plate in an oil cavity; the labyrinth seal comprises a labyrinth seal moving ring and a labyrinth seal static ring, the labyrinth seal moving ring is arranged on the rotor shaft in a sleeving mode and is in linkage with the rotor shaft, and the labyrinth seal static ring is arranged on the labyrinth seal moving ring in a sleeving mode and is fixedly connected with the oil tank side sealing plate; the piston ring seal comprises at least one piston ring; a piston groove is formed in the rotor shaft; or the rotor shaft is sleeved with a piston shaft sleeve, and a piston groove is formed in the outer surface of the piston shaft sleeve; the piston ring is accommodated in the piston groove. Non-contact sealing is completely adopted, the problems of friction heat generation, friction abrasion and the like of a contact lip seal are avoided, the use power consumption of the pump body is reduced, and the quality inspection cost and the manufacturing cost are reduced.

The utility model relates to a composite sealing roots vacuum pump device which comprises a pump body, a front end cover is arranged at the front end of the pump body, a rear end cover is arranged at the rear end of the pump body, a composite sealing structure is arranged between the front end cover and a main shaft, and the same composite sealing structure is arranged between the rear end cover and the main shaft. The composite sealing structure comprises a lip-shaped seal, a ceramic shaft sleeve, a mechanical seal, a lubricating oil inlet and a dry gas seal inlet, the ceramic shaft sleeve and a main shaft sleeve are arranged between the main shaft and the front end cover, the main shaft is sleeved with the ceramic shaft sleeve and the main shaft sleeve, the ceramic shaft sleeve is arranged close to the pump body, and the main shaft sleeve is arranged close to the bearing; a lip seal is arranged between the ceramic shaft sleeve and the front end cover, and a mechanical seal is arranged between the main shaft sleeve and the front end cover; the front end cover is provided with a lubricating oil inlet and a dry gas seal inlet. According to the utility model, the lip seal and the ceramic shaft sleeve are matched with each other, and mechanical seal and dry gas seal are combined, so that high-reliability composite seal is formed, and oil leakage of the roots vacuum pump is avoided.

TITLE OF THE INVENTION: DEVICE FOR STOPPING A LEAK FLOW ON A FLUID PIPELINE The device (30) for stopping excess flow of a leak on a fluid pipeline comprises: - a seal holder (39) comprising a tubular channel, - a shutter (35) facing the upstream end of the tubular channel, - an anchoring means (37) configured to anchor the seal holder in the predetermined pipeline, - a lip seal (40) impervious to the fluid flowing in the pipeline, elastically deformable to a deployed configuration in which the radial extension of the lip seal is greater than the radial section of the predetermined pipeline, and - a retaining ring (41) of the lip seal, which comprises a cylindrical central part fixed relative to the seal holder and radial fins extending from the central part.At least one fin of the retaining ring has, in its free radial deployment configuration, a generally planar shape in a symmetrical trapezoid whose base is located on the central part, the free radial extension of the fins being equal to or greater than the radius of the predetermined pipeline. Figure for abstract: figure 1.

A vacuum table for supporting and flattening an electronic component includes a base plate structure comprising a top surface defining a plurality of suction arrangements. The vacuum table also includes a plurality of lip seals operatively coupled to the base plate structure and extending upwardly beyond the top surface of the base plate structure, the plurality of lip seals arranged to define a plurality of portions of the vacuum table, wherein each of the plurality of portions of the vacuum table includes at least one of the plurality of suction arrangements therein.

The lip seal sealing structure for the rigidity valve comprises a lip seal, a static core, a valve rod and a valve framework, the valve rod penetrates through the static core, the valve framework is installed at the right side end of the valve rod, the lip seal is arranged in the static core, and annular grooves are distributed in the outer circumference of the valve framework. The utility model has the advantages of simple structure and long service life.

The invention relates to the field of semiconductors, and discloses a lip-shaped sealing element shape correcting device which is characterized in that a profiling jig disc assembly is rotatably mounted on a spinning tool platform through a central shaft; the vertical support is installed on the spinning tool platform beside the profiling jig disc assembly. The spinning tool main shaft is installed on the vertical support, and the head of a downward pressing rod at the lower end of the spinning tool main shaft is used for applying downward pressure to conduct shape correcting operation. The spinning tool main knob is installed on the vertical support and drives the spinning tool main shaft to move up and down through a gear mechanism. The positioning knob assembly is installed on the lower portion of the vertical support and can limit rotation of the profiling jig disc assembly so as to ensure that the position, needing shape correction, of a product is located under the head of a lower pressing rod of a spinning tool spindle. The dial indicator is installed on the lower portion of the spinning tool spindle and used for measuring the deformation size of a product in the spinning process. The detection pin is installed on the spinning tool platform beside the vertical support and used for adjusting the height of the dial indicator installed on the spinning tool main shaft to the correction position.

Some example embodiments may relate to laterally moveable compressor piston rod lip seals. For example, a piston rod lip seal assembly may include a lip seal including a circumferential lip configured to seal an inner diameter of the lip seal. The piston rod lip seal assembly may be configured for lateral motion of a piston rod within a housing component, and the lateral motion may be perpendicular to an axis of the piston rod. The piston rod lip seal assembly may further include a heel, a circumferential outer ring, and a spring. The spring may be disposed between, and in contact with, the circumferential lip and the circumferential outer ring. The piston rod lip seal assembly may further include a wave spring configured for face contact with a housing component.

The invention discloses an integrated buffering and sealing engineering machinery oil cylinder, and relates to the technical field of oil cylinders, the integrated buffering and sealing engineering machinery oil cylinder comprises a cylinder body, a piston and a piston rod, the outer side of the piston is provided with a buffering and sealing assembly, the buffering and sealing assembly comprises a buffering column arranged at the front end and two lip-shaped sealing rings, and the bottom of the cylinder body is provided with a base. A buffer groove is formed in the base, and a throttling hole is formed in the base. The device has the advantages that through the integrated design of buffering and sealing structures, multi-stage attenuation of impact loads, dynamic adjustment of sealing force and self-adaptive control of oil flow are achieved, the throttling hole diameter is dynamically adjusted through hydraulic pressure in a cylinder, the multi-stage buffering structure is matched, impact pressure is reduced, and meanwhile the service life of the device is prolonged. A temperature self-adaptive flow control system can intelligently adjust the flow speed according to the viscosity change of hydraulic oil; under the high-temperature working condition, the sealing tightness is actively enhanced, and leakage is effectively inhibited; starting parameters are automatically optimized in a low-temperature environment, and the response speed of equipment is increased.

A rotary union that includes one or more lip seals is disclosed. The rotary union includes a rotary union shaft and a rotary union housing that surrounds the rotary union shaft. Heaters are disposed on the outer surfaces of the rotary union shaft and the rotary union housing. Additionally, a low thermal conductivity path is created between the center portion of the rotary union housing, where the lip seals are located, and the base of the rotary union housing, which contacts the cryogenic fluid. This low thermal conductivity path allows the lip seals to remain sufficiently warm so as to ensure good seal performance and reduced leakage.

A seal assembly for a multi-port valve assembly, the seal assembly including a plurality of beads integrally formed as part of a rotor, at least one seal element in sliding contact with one or more of the beads, and at least one lip seal integrally formed as part of the seal element. One or more of the beads applies force to the seal element, such that the force is transferred to the lip seal. The beads include at least one circumferential bead which circumscribes the rotor, and the circumferential bead continuously applies force to the seal element when the rotor is in each of a plurality of orientations. The beads also include at least one tangential bead extending along an outer surface of the rotor, and the tangential bead applies force to the seal element when the rotor is in one of a plurality of orientations.

A valve member for a connector includes a head portion, a body portion, and a circumferential lip seal extending radially outward from an outer surface of the head portion. The head portion includes a top section defining a first seal portion. The body portion extends longitudinally from the head portion and defines a second seal portion at a proximal end thereof. The second seal portion is disposed distally to the first seal portion. The circumferential lip seal is disposed between the first and second seal portions.

The utility model relates to the technical field of combined oil seals, and discloses a combined oil seal with a stable outer diameter structure, which comprises an oil seal assembly, the oil seal assembly comprises a mounting outer ring, a lip sealing ring A is fixedly connected to the inner side surface of the mounting outer ring, a spring is fixedly connected to one side of the lip sealing ring A, a supporting steel frame A is fixedly connected to one side of the lip sealing ring A, and a supporting steel frame B is fixedly connected to the other side of the lip sealing ring A; the supporting steel frame A is arranged in the mounting outer ring, the protective sleeve is arranged on the surface of the outer side of the mounting outer ring, the supporting steel frame B is arranged in the mounting outer ring, one end of the supporting steel frame B is fixedly connected with the lip sealing ring B, and the mounting inner ring is fixedly connected to the surface of the outer side of the lip sealing ring B. Through the arrangement of the oil seal assembly, the oil seal assembly can seal the oil seal. The protective sleeve is of a rubber half-wrapping design, the sealing performance of the protective sleeve is guaranteed, the better stable and accurate assembling characteristic is achieved, the combined part oil seal can effectively block impurities in sealing media, and therefore the service life of the oil seal is prolonged while the effect of protecting the main lip opening is achieved.

The utility model discloses a magnetic confinement large-diameter lip-shaped sealing system for a rotating shaft, which is characterized by comprising a rubber seal (1), a magnetic rubber ring (2), a support ring (3), a rotating shaft (4) and a sealing cavity (5), the magnetic rubber ring (2) is embedded in the rubber seal (1), the support ring (3) is arranged in the sealing cavity (5), and the rotating shaft (4) is arranged in the sealing cavity (5). And the rubber seal (1) is fixed between two adjacent support rings (3). According to the oil seal, appropriate radial force can be provided by controlling the magnetic force of the magnetic rubber ring (2), when the lip is abraded, the magnetic rubber ring (2) is closer to a rotating shaft (4), the magnetic force is increased, the radial force reduced due to the abrasion of the lip is compensated, and then the radial force of the oil seal lip is maintained at a relatively stable level for a long time.

A seal assembly (32) includes a wear sleeve (34), the wear sleeve having an outer sleeve surface (44) made of a fluoropolymer material and a lip seal (36) made of an elastic material and fitted upon the wear sleeve. The lip seal defines a seal axis (18) extending between a first axial seal end (20) and a second axial seal end (20) and includes an outer seal surface (52) and a circumferentially extending inner seal surface (54) forming an opening receiving the wear sleeve. The lip seal further includes a sealing lip (58) in sealing contact with the outer sleeve surface.

An improved multiport rotary valve assembly is disclosed for fluid control systems, particularly in direct lithium and mineral extraction applications. The assembly features a valve body comprising a housing ring, upper and lower closure discs, and a process disc, with advanced polymeric seals, including radial and lip seals, ensuring robust sealing engagement. A mechanically biased tensioning assembly, incorporating tension springs and load cells, maintains consistent sealing compression, mitigating issues of under-engagement and over-engagement caused by thermal and pressure variations. The valve assembly reduces leakage, cross-contamination, and seal degradation, enhancing extraction rates, operational efficiency, and seal longevity. Real-time monitoring and feedback mechanisms enable precise adjustments during startup, operation, and cooldown, minimizing manual intervention and downtime. This design addresses stringent purity requirements in direct lithium extraction while supporting high throughput and reliable performance under demanding conditions.

This invention discloses a high-pressure water electrolysis hydrogen production device, including a pressing device and an electrolytic cell. The pressing device applies sealing pressure to both ends of the electrolytic cell. Several electrode assemblies are stacked sequentially in the pressing device. A lip seal and a limiting ring are concentrically arranged between two adjacent electrode assemblies. The limiting ring is sleeved on the outside of the lip seal. Two adjacent electrode assemblies are spaced apart on both sides of the limiting ring and are insulated. The inner ring wall of the limiting ring is used to circumferentially constrain the lip seal. The water pressure strength of the electrolytic cell of this invention can reach 10 MPa or above, and the safe pressure for air tightness testing can reach 8 MPa or above. By changing the sealing principle of the electrolytic cell, changes are made to the sealing system of the electrolytic cell, overcoming the sealing difficulties in manufacturing ultra-large electrolytic cell equipment and overcoming the deflection and deformation problems during the use of medium and large-sized electrolytic cell equipment, thus meeting the market demand for high-pressure, especially high-pressure medium and large-sized water electrolysis hydrogen production equipment.

The utility model relates to the technical field of drilling tools, in particular to a full-hydraulic bidirectional jar for a high-energy coiled tubing, which comprises a wash pipe assembly, a cone valve, a pressure energy shell and a transmission assembly, the wash pipe assembly comprises a wash pipe, a wash pipe shell and a first lip-shaped sealing component arranged in the wash pipe shell; the cone valve and pressure energy shell comprises a first cone valve, a second cone valve and a pressure energy shell; the transmission assembly comprises a spline punching shaft, a spline shell and a pressure regulating ring; the first cone valve and the second cone valve are fixed to the spline punching shaft through the first sealing ring and the second sealing ring respectively, the spline punching shaft is connected with the pressure energy shell in a matched mode through a spline, and the pressure adjusting ring is arranged in an axial adjusting groove of the spline punching shaft in a sleeved mode. By means of the full-hydraulic two-way jarring structural design, two-way controllable jarring under the lifting and pressing working conditions is achieved, and the limitation of a traditional one-way jar is solved.

The utility model belongs to the technical field of sliding sealing, and particularly relates to an O-shaped and lip-shaped combined sealing and slotting structural body which comprises a sliding structural body, a lip-shaped sealing ring, an O-shaped inner sealing ring and an O-shaped outer sealing ring. The combined groove comprises a fixed limiting ring groove and a sliding limiting ring groove which are distributed up and down, the lip-shaped sealing ring comprises a fixed annular part and two lip parts, the inner wall of the fixed limiting ring groove is sleeved with the fixed annular part in the radial direction, and the lip parts are located in the sliding limiting ring groove; by means of the combination mode, the O-shaped sealing ring and the lip-shaped sealing ring complement each other in advantages, low friction resistance and high-pressure compression capacity are achieved, no lubricating oil is needed in the whole installation and use process, and therefore the sealing ring can be used as a component of equipment for providing clean compressed gas and can also be used as a clean hydraulic component, and the service life of the sealing ring is prolonged. The device is especially suitable for medium-high voltage application occasions.

The invention provides an abrasion monitoring sealing ring structure, a forming process and a sealing device, the abrasion monitoring sealing ring structure comprises a lip-shaped sealing ring, the lip-shaped sealing ring is provided with a base and a lip part which are connected, a transition part is formed between the base and the lip part, and a mounting groove extending to the transition part and the base is formed in the lip part; the flexible circuit board is provided with a first fixed end part, an elastic telescopic part and a second fixed end part which are sequentially connected along the length direction of the flexible circuit board, the flexible circuit board is arranged in the mounting groove, the first fixed end part and the second fixed end part are respectively fixed on the lip part and the base, and the elastic telescopic part corresponds to the transition part; under the state that the angle between the base and the lip part is changed, the elastic telescopic part located on the transition part is stretched or shortened; and the first fixed end part can be worn along with the lip part so as to change a monitoring electric signal formed in the flexible circuit board. According to the invention, the problems of low monitoring precision, weak reliability, difficult installation and poor practicability of the current shield main drive seal can be solved.

The utility model relates to the technical field of ball valves, in particular to a one-piece type floating ball valve which comprises a valve body and a valve cover assembly, a valve cavity, an inflow channel and an outflow channel are arranged in the valve body, the inflow channel and the outflow channel are respectively communicated with the valve cavity, a valve seat is arranged in the valve cavity, and a check block and a pressing block are arranged on the inner side of a valve cover. The right side of the pressing block is arranged on the valve seat in a pressing mode, it is guaranteed that the valve seat is installed and fixed, the first lip-shaped sealing ring and the second lip-shaped sealing ring are separated through the check block, the first lip-shaped sealing ring and the second lip-shaped sealing ring do not affect each other, and the sealing effect of the first lip-shaped sealing ring and the sealing effect of the second lip-shaped sealing ring are guaranteed. The first lip-shaped sealing ring and the second lip-shaped sealing ring form a lip-shaped sealing ring structure between the valve cover assembly and the valve body, so that the lip-shaped sealing ring structure is adopted in the small-caliber one-piece type floating ball valve; and the first lip-shaped sealing ring and the second lip-shaped sealing ring form a double-sealing structure, so that the sealing effect of the ball valve is improved.

The utility model discloses a condenser pipe device, and relates to the technical field of condenser pipes. Comprising an outer pipe body, a discharge pipe is arranged at the bottom of the outer pipe body, a communicating assembly is arranged in the outer pipe body, an installation connecting assembly is arranged at the top of the outer pipe body, the communicating assembly comprises an annular pipe arranged above the top end of the outer pipe body, and the installation connecting assembly comprises an installation pipe fixedly arranged on the outer side of the annular pipe in a sleeving mode; the top of the outer pipe body is sleeved with the connecting pipe, a stepped block groove is formed in the outer side of the top end of the outer pipe body, a stepped ring block is fixed to the inner wall of the connecting pipe and matched with the stepped block groove, and a lip-shaped sealing ring is installed on the stepped block groove. Through the arrangement of the installation connecting assembly, the outer pipe body and the spiral pipe of the device are integrally locked, installed and connected through the installation pipe and the connecting pipe, the sealing performance is guaranteed, meanwhile, the device is convenient to disassemble and replace, the whole device does not need to be replaced after being damaged, and the usability of the device is guaranteed.

The application discloses an integrated buffer seal engineering machinery oil cylinder and relates to the technical field of oil cylinders, which comprises a cylinder body, a piston and a piston rod, a buffer seal assembly is arranged outside the piston, the buffer seal assembly comprises a buffer column arranged at the front end and two lip-shaped sealing rings, a base is arranged at the bottom of the cylinder body, a buffer groove is formed in the base, and a throttle hole is formed in the base. The integrated design of the buffer and the sealing structure achieves multistage attenuation of impact load, dynamic adjustment of sealing force and self-adaptive control of oil flow, the cylinder hydraulic pressure dynamically adjusts the throttle hole diameter, cooperates with the multistage buffer structure, and reduces the impact pressure; meanwhile, the temperature self-adaptive flow control system can intelligently adjust the flow rate according to the change of the hydraulic oil viscosity, actively enhances the sealing tightness under high-temperature working conditions, effectively inhibits leakage, automatically optimizes the starting parameters in a low-temperature environment, and improves the equipment response speed.

The utility model provides a multi-lip sealing ring for a variable pitch bearing and a yaw bearing of a fan, which belongs to the technical field of wind driven generators, overcomes the defect of poor sealing effect of the existing rubber sealing ring, and comprises an upper sealing lip and a lower sealing lip, a right sealing lip is arranged between the upper sealing lip and the lower sealing lip, and the upper sealing lip and the lower sealing lip are integrally formed. The section cutting plane of the upper sealing lip is in a triangular shape, the included angle of the two sides of the upper sealing lip is an obtuse angle, the section cutting plane of the lower sealing lip is in a long strip shape, the upper sealing lip and the lower sealing lip are arranged in a right upper inclined shape and a left lower inclined shape together, and the right sealing lip is in a long strip shape and is in smooth connection with the lower sealing lip through a concave arc. The sealing grooves are in contact with the side faces of the sealing grooves, and the sealing effect is good; a gap is formed between the right side of the bearing sealing groove and the right sealing lip and has a follow-up compensation sealing function; the lower portion of the dustproof lip is provided with the concave arc face, the dustproof lip is fully lubricated, the dustproof lip and the sealing lip are connected through the concave semicircle, and sufficient elastic space is provided for a lip opening so that the lip opening can not be torn.

The utility model belongs to the technical field of lip sealing rings, and particularly relates to a lip sealing ring of a new energy automobile, which comprises a sealing ring body, a plurality of groove bodies are arranged on the surface of the sealing ring body, the groove bodies are used for increasing the number of contact surfaces generated when the sealing ring body is used for sealing, and a cavity is arranged inside the sealing ring body. The cavity is used for containing lubricating materials, a plurality of through holes are formed in the sealing ring body in a penetrating mode and communicated with the cavity, the sealing ring body is provided with a top face, a bottom face, an inner wall and an outer wall, and the groove bodies are arranged on the inner wall and the outer wall of the sealing ring body. The lubricating material in the cavity is conveyed to the surface of the sealing ring body through the through holes, so that the friction force borne by the surface of the sealing ring body is reduced, the friction resistance between the first sealing ring and the inner wall of the engine is reduced, the friction damage speed of the first sealing ring is reduced, and the service life of the sealing ring body is prolonged.

The invention discloses a self-adaptive intelligent regulation and control lip sealing device based on a slide valve mechanism. The device comprises a sealing ring body, an air spring, a rigid framework, a main air channel, the slide valve mechanism, an auxiliary lip O-shaped ring, an auxiliary lip air channel, a spoke type radial air channel and a pressure sensor. A slide valve mechanism responds to pressure fluctuation monitored by a pressure sensor, and dynamically controls gas to flow among a main gas channel, a radial gas channel and an auxiliary lip gas channel, so that self-adaptive adjustment of the holding force of a main lip part is realized: when overpressure is caused by vibration, gas is exhausted to an auxiliary lip to enhance sealing and active chip removal; and when low pressure is caused by abrasion, the holding force is recovered through air supplementation. The working mode comprises a normal cut-off state and automatic adjustment circulation, and the slide valve mechanism automatically resets after pressure balance. Control units are evenly arranged in the circumferential direction of the device, non-uniform pressure is monitored and coped independently, the exhaust-sealing-self-cleaning synergistic effect is formed, the sealing reliability and dynamic stability are remarkably improved, and the service life is remarkably prolonged.

The utility model relates to a low-temperature two-way lip-shaped sealing floating ball valve which comprises a valve body, a valve cover, a ball body, a valve seat, a valve rod, a support and a transmission mechanism, the valve seat is of a floating structure, the support is of a lengthened structure, and a heat insulation plate is arranged in the middle of the support. Composite sealing devices composed of sealing washers and pressure self-sealing devices are arranged between the valve body and the valve deck and between the valve body and the support respectively, medium pressure pushes wedge-caulking rings of the pressure self-sealing devices to open sealing between the two sides of elastic expanding and shrinking rings and the valve body, between the valve deck and the support and between the valve body and the support, and self-sealing between the valve body and the valve deck and between the valve body and the support is achieved. The problem that the sealing performance between the valve body and the valve cover and between the valve body and the support is reduced due to shrinkage of the sealing washer under the low-temperature working condition is solved, and zero leakage is achieved. The sealing device is reliable in sealing performance and suitable for working conditions of low-temperature media such as liquid nitrogen, liquid oxygen and liquefied natural gas.

The invention relates to the technical field of polypropylene devices, in particular to a sealing structure for protecting a floating end bearing of a reaction stirrer of a polypropylene device, which comprises a stuffing box, a stuffing gland, stuffing, an air seal ring and a framework lip seal, a left packing set, an air seal ring, a right packing set and a framework lip seal are sequentially arranged in the packing ring groove from left to right. The left packing set, the right packing set and the framework lip seal are arranged in the packing ring groove, the left packing set, the right packing set, the framework lip seal and the main shaft of the reaction stirrer of the polypropylene device achieve dynamic sealing, the propylene purging pipeline is arranged, the gas seal ring purges propylene gas into the packing ring groove, and positive pressure protection is achieved; therefore, powder in the reaction area can be effectively prevented from entering the floating end bearing seat, the purpose of protecting the floating end bearing is achieved, and the service life of the floating end bearing is greatly prolonged.