17 results about "Cryogenic seal" patented technology

The application belongs to the technical field of seal component design, and discloses a high-speed dynamic seal rotary joint suitable for super-low-temperature fluid, which mainly comprises a static shaft, a rotary shell, a super-low-temperature seal ring, a guide ring and a check ring. The high-speed dynamic seal rotary joint suitable for super-low-temperature fluid is used to realize the integration of the blocking flow, the labyrinth and the multi-stage lip seal structure in the limited space. The shrinkage deformation of the super-low-temperature seal ring in the super-low-temperature environment can be obviously inhibited by optimizing the base material of the super-low-temperature seal ring and additionally arranging the anti-shrinkage ring structure. The interference amount of the matching surface of the super-low-temperature seal ring is reasonably adjusted, so that the close contact of the lip seal interface in the super-low-temperature environment is ensured.

The invention discloses a low-temperature filling valve clack with a bionic sealing microstructure and a laser machining method, the valve clack is in a circular step shape and is composed of an upper cylinder and a lower cylinder which are different in diameter, and the step portion where the two cylinders are connected is of a circle of annular thin groove structure; wherein side wall annular groove sealing microstructures are arranged on the side wall of the first cylinder in an array mode, and / or groove face sealing microstructures are arranged on the groove face of the annular thin groove structure in an array mode. The groove surface sealing microstructure is one of a pit circular ring sealing microstructure and a U-shaped connecting groove sealing microstructure; the side wall ring groove sealing microstructure is an annular groove, and the bottom of the annular groove is high in the middle and low in the two sides. The pit circular ring sealing microstructure comprises an annular pit and a circular boss protruding from the bottom of the annular pit. According to the scheme, the three bionic sealing function microstructures and the arrangement mode of the three bionic sealing function microstructures on the sealing face of the valve clack are provided, and the low-temperature sealing performance can be remarkably improved through the formed three bionic sealing microstructures through multi-stage morphology design and structure collaborative optimization.

The invention relates to the field of sealing, and discloses a low-temperature sealing device and a manufacturing method.The low-temperature sealing device comprises a cylinder valve seat, an outer bottle opening is formed in the top side of the cylinder valve seat, and a connecting shell is arranged on the outer side of the cylinder valve seat and protrudes upwards out of the cylinder valve seat; a sealing table is formed on the bottom side of the sealing plug, an inner plug body is formed on the bottom side of the sealing table, the sealing table is connected to the connecting shell, the inner plug body is connected to the inner side of the cylinder valve seat, and a first groove is formed between the bottom side of the sealing table and the top side of the cylinder valve seat; the end face sealing assembly comprises an inner sealing piece, an expansion part and an outer sealing assembly, the outer sealing assembly can abut against the expansion part and enable the expansion part to abut against the sealing table and the cylinder valve seat in the vertical direction, and triple sealing is formed by the inner sealing piece, the expansion part and the outer sealing assembly; the expansion part can be jacked and pressed from the inner direction and the outer direction, the gap between the sealing table and the cylinder valve seat is further compensated through the expansion part, and therefore the sealing effect is effectively improved.

Cryogenic seal having biasing member (e.g. spring 24) urging the seal (e.g. O-ring 21) towards a sealing surface 8, the seal 21 composes minimum 95% polymer and filler by weight, the polymer is minimu

The application discloses a sealed sensitive pressure sensor core and a sealing method thereof, and comprises a core shell and a core substrate, and the inside of the core shell is provided with a mounting cavity for mounting the core substrate; the core substrate is provided with a pressure sensing surface and a sealing surface, the pressure sensing surface is provided with a pressure sensing diaphragm, and the pressure sensing surface is opposite to the bottom of the mounting cavity; the sealing surface is opposite to the side wall of the mounting cavity, the sealing surface is higher than the pressure sensing diaphragm, and the sealing surface and the side wall of the mounting cavity are sealedly connected through sealing glass; a glass forming flow channel is formed between the sealing surface and the side wall of the mounting cavity, and the glass raw material is formed into a gel after being melted and then flows and forms in the glass forming flow channel to form the sealing glass. The glass sealing is applied to the pressure sensor to meet the low-temperature sealing requirement of the pressure sensor.

The invention belongs to the technical field of dry gas seal control, and discloses a dry gas seal starting preheating and dynamic cooling temperature control system for a coal-fired unit, which comprises a supercritical carbon dioxide Brayton cycle system, a working medium filling system and a rotating machine cooling system, the supercritical carbon dioxide Brayton cycle system is used for taking the coal-fired boiler as a system heat source, outputting electric energy and compressing a working medium; the working medium filling system is used for filling the supercritical carbon dioxide Brayton cycle system with a carbon dioxide working medium in the initial stage of cycle starting and supplementing the working medium into the rotating machine cooling system; and the rotating machine cooling system is used for leading out the working medium in the supercritical carbon dioxide Brayton cycle system to the dry gas sealing position of the expansion machine and the main compressor, and starting preheating and dynamic cooling are achieved. In the starting stage and the variable load operation stage, the temperature of the sealing end face stably rises to 90 DEG C by adjusting a rotating machine cooling system, and phase-change condensation of a carbon dioxide working medium in the low-temperature sealing end face is avoided. And in the dynamic cooling mode, the temperature of the sealing end face is controlled within the set temperature value deviation of 10 DEG C, and parameter regulation and control can be completed in time when the load changes.

The invention belongs to the technical field of design of sealing parts, and discloses a high-speed dynamic sealing rotary joint suitable for ultralow-temperature fluid, which mainly comprises a static shaft lever, a rotary shell, an ultralow-temperature sealing ring, a guide ring and a check ring. According to the high-speed dynamic sealing rotary joint suitable for the ultralow-temperature fluid, integration of flow choking, labyrinth and lip-shaped multi-stage sealing structures is achieved in a limited space; the base material of the ultralow-temperature sealing ring is optimized, and the anti-shrinkage ring structure is additionally arranged, so that shrinkage deformation of the ultralow-temperature sealing ring in an ultralow-temperature environment can be remarkably inhibited; and the interference magnitude of the matching surface of the ultralow-temperature sealing ring is reasonably adjusted, so that the close contact of a lip-shaped sealing interface in an ultralow-temperature environment is ensured.

A kind of hydrogen energy LH2 / LNG ultralow temperature pull-off valve performance measuring device, installation groove is equipped in installation table upper end, left end chassis and right end chassis are distributed left and right with installation groove connection, high-pressure barrel assembly is equipped on left end chassis, high-pressure barrel cover assembly, hydraulic cylinder assembly is equipped on right end chassis and is connected with flange barrel assembly by tension rope, the left end of measured valve is connected with high-pressure barrel assembly, the right end of measured valve is connected with flange barrel assembly, high-pressure barrel cover assembly, flange barrel assembly and hydraulic cylinder assembly are connected with data control system;Form low-temperature multi-phase pull-off performance test loop, low-temperature sealing test loop and low-temperature high-pressure impact test loop.The main advantages are: the installation table, chassis, tension system integration prototype design, realize device structure simplification, manufacturing cost reduction, operation and safety and measurement accuracy are improved, meet the low-temperature sealing, high-pressure impact and axial, 45 ° and 90 ° multi-phase pull-off performance core index test requirements of measured piece.

The utility model relates to the technical field of sealing flanges, and discloses a low-temperature sealing flange for an ozone generator, which comprises a flange seat, a plurality of connecting columns are arranged on the flange seat, and two sides of the flange seat are connected with interfaces; sealing rings are arranged at the connecting positions of the connector and the first connecting pipe and the second connecting pipe, the sealing rings are made of fluororubber materials, the sealing rings are filled with graphene, a plurality of notches are formed in the surface of the connector, a plurality of protruding blocks are arranged on the inner sides of the sealing rings, and the protruding blocks are connected with the notches in a clamped mode. According to the utility model, the bumps on the surface of the sealing ring are all clamped into the notches, so that the sealing ring is limited, the stability of the sealing ring is improved, deviation is avoided, the sealing efficiency is improved, and the graphene is arranged in the sealing ring, so that the low-temperature elasticity and the ozone penetration resistance can be improved, and the problems of sealing performance reduction, material embrittlement and the like are prevented; ozone leakage is avoided, ozone generation efficiency is not affected, environmental pollution is avoided, and potential safety hazards are prevented.

This invention discloses a liquefied gas storage tank and a vessel for transporting liquefied gas. The liquefied gas storage tank includes a main shielding layer that contacts the liquefied gas on one side, a secondary shielding layer disposed on the other side of the main shielding layer, and at least one liquefied gas loading / unloading tower. The base of the liquefied gas loading / unloading tower includes: a lower part of the base body fixedly connected to the bottom wall; a corrugated plate of the secondary shielding layer connected to the lower part of the base body; and a closed end at one end of at least one corrugation of the secondary shielding layer facing the lower part of the base body. An upper part of the base body has mounting holes in the main shielding layer, through which the upper part of the base body is fixedly connected to the lower part of the base body. By opening mounting holes on the flat surface of the main shielding layer to achieve the installation of the pump tower base, the integrity of the corrugated structure of the main shielding layer is fully preserved, ensuring the expansion and contraction performance of the main shielding layer in low-temperature environments and improving the low-temperature sealing reliability of the storage tank.

The invention belongs to the technical field of intelligent magnetic material preparation and low-temperature sealing environment application thereof, and particularly relates to a preparation method of high-performance magnetic liquid for a low-temperature sealing environment. The method comprises the following steps: (1) controllably doping different ions to prepare ferrite nanoparticles with high saturation magnetization at low temperature; (2) adjusting the pH value of the reaction liquid to change the zeta potential on the surface of the nano magnetic particles; (3) carrying out effective chemical coating on the particles by using oleic acid; and (4) uniformly dispersing the coated particles in low-temperature hydraulic oil to prepare the low-temperature-resistant magnetic liquid with high dispersion stability. The prepared magnetic liquid has a saturation magnetization value and fluidity which are obviously higher than those of conventional magnetic liquid at low temperature, and can be applied to the application fields of hydraulic mechanical sealing and low-temperature environment high-end sealing.

This invention belongs to the field of CNC machine tool functional component design technology, and discloses an ultra-low temperature internally cooled tool post-turning tool system that can realize directional switching and delivery of liquid nitrogen. It mainly consists of an ultra-low temperature medium internally sprayed tool post, a quick-change liquid nitrogen internally cooled square shank turning tool, and a quick-change liquid nitrogen internally cooled round shank turning tool. Through the designed ultra-low temperature medium internally sprayed tool post, an internal spray cooling method is achieved, delivering the ultra-low temperature medium to the tool tip via the flow channel of the ultra-low temperature internally cooled tool post-turning tool system. This overcomes the ultra-low temperature sealing and heat insulation technology within the tool post and at the connection between the tool post and the tool, and solves the integration problem of the liquid nitrogen internal spray cooling function with the lathe tool post, square shank turning tool, and round shank turning tool structure. By designing an axially displaceable liquid nitrogen transmission pipeline, directional supply and switching of the ultra-low temperature medium to the working tool is achieved during automatic tool changing. The liquid nitrogen internally cooled tool features a separate tool head and tool holder design, ensuring reliable liquid nitrogen delivery while simplifying the tedious process of re-setting the tool after each tool change.

The application provides a manufacturing method of an ultralow-temperature high-load bidirectional sealing device, which comprises the following steps: supporting a plastic ring by using a mandrel tool, and then mounting spring sheets on the outer profile surface of the plastic ring; clamping the spring sheets by using a clamp, and then mounting a pressing sleeve on the outer profile surface of the spring sheets; pressing the spring sheets by using a pressing machine to limit the spring sheets and the pressing sleeve; bidirectionally pressing the pressing sleeve, the spring sheets and the plastic ring to form a pressing sleeve assembly; measuring the distance between the end surface of the pressing sleeve assembly and the end surface of a sealing framework after pressure relief, and the distance meets the set index requirement; clamping the bidirectional sealing device, and adopting a hob to roll the outer edge and the inner hole edge; and adopting a sealing screening tool to perform an air-tightness screening test on the bidirectional sealing device. The application effectively solves the manufacturing technical problem of a liquid rocket engine low-temperature sealing device, improves the assembly efficiency and assembly quality of the sealing device, and ensures the sealing performance of the valve.

This invention relates to the field of sealing and discloses a low-temperature sealing device and its manufacturing method. The low-temperature sealing device includes: a bottle valve seat with an outer bottle opening on its top side and a connecting shell on the outer side of the bottle valve seat, the connecting shell protruding upward from the bottle valve seat; a sealing plug with a sealing platform formed on its bottom side and an inner plug body formed on the bottom side of the sealing platform, the sealing platform being connected to the connecting shell and the inner plug body being connected to the inner side of the bottle valve seat, a first groove being formed between the bottom side of the sealing platform and the top side of the bottle valve seat; and an end-face sealing assembly including an inner sealing element, an expansion part, and an outer sealing assembly. The outer sealing assembly can press against the expansion part, causing the expansion part to press against the sealing platform and the bottle valve seat in the vertical direction. This invention forms a triple seal with the inner sealing element, the expansion part, and the outer sealing assembly. When gas leakage occurs, the expansion part can be pressed against the bottle valve seat from both inside and outside, further compensating for the gap between the sealing platform and the bottle valve seat, thereby effectively improving the sealing effect.

The utility model discloses a low temperature sealed type ozone monitoring module, it relates to ozone monitoring module technical field, aims at solving the current ozone monitoring module when facing the low temperature environment of time, the shrinkage of sealed structure is easy to appear, and the sealed performance drops the condition, and cannot nimblely adjust the operation problem, and its technical scheme main points include detection pool, and one movable end is rotatively sleeved in the both ends of detection pool respectively, the side surface of movable end and detection pool all is provided with gas guide hole, and the both ends of movable end all are provided with the mounting groove, and the inside mounting of mounting groove has sealed gas bag, the end surface of movable end is fixedly connected with the adjusting seat, the end surface of adjusting seat is provided with the threaded hole, and the threaded hole is screw thread connection with piston rod. Reached the sealed structure of inside can adjust the operation, and the sealed performance is strong, and the module can carry out remote operation simultaneously, and the practicality is strong effect.

This invention provides a low-temperature resistant sealing film, a storage tank, and a manufacturing method for covering insulating materials. The sealing film includes at least one film plate. Each template includes multiple quadrilateral plate units welded and fixed by a sealing welding method. Each plate unit includes an undulating region and a planar region. The undulating region has arc-shaped strip-shaped main protrusions that are connected tangentially. Each plate unit has at least four main protrusions that are symmetrically arranged about the center of the plate unit and perpendicular to the centerline of the plate unit. Each arc-shaped main protrusion has its inner corner point of the corresponding plate unit as its center. Each main protrusion is hollow, and the cross-section of each main protrusion includes a top arc segment and a connecting arc segment. The curvature of the top arc segment is continuous. One end of the connecting arc segment is tangentially connected to one end of the top arc segment, and the other end of the connecting arc segment is tangentially connected to the planar region.

A fill port and apparatus for a cryogenic container includes a static gland having an internal cavity and a cryogenic seal surrounding an outlet, the outlet connected to the cryogenic container. A mechanical gland connected to a source of cryogenic fluid is sealingly positioned in the cavity of the static gland. The mechanical gland is arranged to be positionable within the static gland into a fill, or alternately, a seal position wherein in the fill position, cryogenic fluid flows through the mechanical gland into the cryogenic container through the outlet. Positioning the mechanical gland in the seal position causes the mechanical gland to engage the cryogenic seal isolating the cryogenic container from the outlet.