Abstract: A microfluidic chip includes an upper surface, a lower surface opposite the upper surface, a flow passage for fluid located between the upper surface and the lower surface, a communication hole that communicate with the flow passage and open at the upper surface or the lower surface, and an annular seal formed from an elastomer, the annular seal being placed in contact with or being formed on the upper surface or the lower surface at which the communication hole opens and surrounding the communication hole. The microfluidic chip further includes a support structure fixed at a position within the flow passage, the position overlapping the annular seal, the support structure securing a height of the flow passage so as to prevent blockage of the flow passage.
October 16, 2019
October 14, 2021
NOK CORPORATION, THE UNIVERSITY OF TOKYO
Takumi YOSHITOMI, SooHyeon KIM, Teruo FUJII, Mingyue SUN
Abstract: A sealing device that can suppress entrance of foreign matter into a place between the end surface of a rotating ring and the end surface of a fixed ring. A sealing device 10 that seals the annular gap between a rotating shaft and a housing having a shaft bore into which the rotating shaft is inserted includes a rotating ring unit 100 provided to the rotating shaft and a fixed ring unit 200 provided to the housing. A plurality of protrusions 140 configured to generate an airflow from the rotating ring 130 side to the fixed ring 230 side when the rotating ring unit 100 rotates are provided on the inner peripheral surface of the rotating ring 130.
Abstract: This invention provides a highly reliable separator integrated gasket for fuel cells free from deformation of a separator in a gasket molding process. In order to achieve the object, a pair of separators having adjacent portions approaching each other and separation portions separating from each other in a stacked state and having manifold holes opened in the separation portions are stacked via a spacer in which an inner peripheral hole is opened and which enables the circulation of a fluid in a direction orthogonal to the stacking direction so that the manifold hole and the inner peripheral hole are continuous to each other, a stacked object of the separators and the spacer is disposed in a mold, and then a rubber molding material is charged into and cured in gasket molding cavities defined between a surface opposite to the spacer in the separator and the mold.
Abstract: A method for producing a porous hollow fiber membrane for humidification, the method comprising dry-wet spinning a spinning dope comprising a water-soluble organic solvent solution composed of polyphenylsulfone resin and hydrophilic polyvinylpyrrolidone using water as a core liquid; then performing a crosslinking treatment at 120 to 220° C. for 1 to 20 hours; and then dipping the resultant in an acidic solution with a concentration of 5 to 500 ppm. The obtained porous hollow fiber membrane has improved hydrophilicity without impairing the wettability of the porous hollow fiber membrane. Since, humidification performance of the porous hollow fiber membrane alone can be improved, it is effective as a humidifying membrane for fuel cells.
Abstract: A gasket is formed by extrusion and easily fastened into a groove which can be easily formed by presswork. A gasket is configured to seal a gap between a first member that has a sectionally curved groove and a second member. The gasket includes a rubber-like elastic base and at least two pairs of rubber-like elastic fins. The base can be inserted into the groove, and has a height allowing the base to be compressed when the first member and second member are coupled to each other. The fins protrude at different heights from the both side surfaces of the base, and can elastically deform in a direction opposite to an insertion direction when the base is inserted into the groove so that the fins contact the side walls of the groove. The base and the fins are integrally formed with each other as one unitary member by extrusion.
Abstract: An acrylic rubber composition comprising 0.05 to 3.0 parts by weight of a fluorine-containing compound having a melting point of 30 to 100° C., based on 100 parts by weight of acrylic rubber. The acrylic rubber composition that can improve the dispersibility of a processing aid in the compound and the rubber compound handling properties during open roll operation without using a silicone-based processing aid, which causes bleeding of vulcanizates, and that satisfies the various characteristics, such as dimensional stability and heat resistance, of vulcanizates.
Abstract: Provided is a sealing material having abrasion resistance usable for even construction machinery operated under severe conditions while keeping mechanical strength thereof. The sealing material includes a fluorinated resin composition containing the following materials (1) and (2), and further containing the following material (3) or (4). The materials are: (1) fluorinated resin, (2) bronze, (3) tricobalt tetraoxide, (4) a composite metal oxide containing cobalt and aluminum, and further containing at least one of metals selected from the group of chromium, titanium, magnesium, calcium, and lithium. Preferably, the fluorinated resin is polytetrafluoroethylene. Further, the sealing material is usable for construction machinery.
Abstract: A fuel cell seal structure includes stacked fuel cells and an electrolyte membrane or a film supported between the neighboring metal separators. Each of the stacked fuel cells includes neighboring metal separators each including a plate portion having a plate portion surface, a bead seal portion projecting from the plate portion surface and including a distal end having a distal end surface, an elastic body disposed on the distal end surface, and a stopper disposed on the plate portion surface and away from the elastic body. The neighboring metal separators are disposed such that elastic bodies are located opposed to each other in a stacking direction with the electrolyte membrane or the film supported in between the elastic bodies and face each other, and such that stoppers are located neighboring to each other in the stacking direction with the electrolyte membrane or the film supported in between the stoppers.
Abstract: A sealing structure which can more simply and securely hold a gasket on an upper end of a side wall of a battery case as attached member is provided. The sealing structure includes a gasket arranged along an upper end side of a side wall of a battery case and an attachment wall fastened to the side wall of the battery case. The gasket includes a gasket main body and a bulging sealing portion. The gasket main body has an upper end arranged higher than the upper end of the side wall. The bulging sealing portion is arranged on the exterior side of the upper end side of the gasket main body, and tightly contacts an inner peripheral surface of an engagement portion arranged on an outer edge of a cover for covering an opening side of the battery case. The attachment wall includes an accommodation portion and an outer peripheral surface. The accommodation portion accommodates a lower side of the gasket main body between the side wall and the attachment wall.
Abstract: A sealing structure which can more simply and securely hold a gasket on an upper end of a side wall of a battery case as attached member is provided. A sealing structure includes a gasket and an attachment wall. The gasket has a shape of straddling an upper end of a side wall of a battery case. The gasket on the top surface side is configured to be in tight contact with a cover for covering an opening side of the battery case. The attachment wall is fastened to the side wall of the battery case, and has a placement surface arranged to be in contact with a lower end of an engagement portion arranged on an outer edge of the cover and an lower end of the gasket.
Abstract: A sealing apparatus which is capable of preventing static leakage of a target to be sealed without increasing sliding resistance with respect to a shaft, and a surface processing method of a disk member of the sealing apparatus which is capable of processing a surface of the disk member, such as a slinger, provided at the sealing apparatus. A surface processing method of a disk member of a sealing apparatus for forming a plurality of fine spiral grooves on a surface of the disk member provided at the sealing apparatus has a grinding member having a plurality of fine projections that is moved to an outer edge side while the grinding member is pressed against the surface of the disk member which relatively rotates around an axis, and the sealing apparatus includes a slinger at which a plurality of fine spiral grooves are randomly formed on another side surface of a flange portion.
Abstract: A base-material/gasket unit mold which can reduce molding failure occurrence is provided. The mold includes a first half mold including a base material holding portion arranged on a first parting surface to hold a base material, and a second half mold having a second parting surface and used together with the first half mold to close and open the mold. The second half mold includes a gasket cavity defined on the second parting surface side to form a gasket main body 121 on a surface of the base material, an isolated rubber cavity forming an isolated rubber portion isolated from the gasket main body on the surface of the base material, and a mold-pressing portion arranged around the isolated rubber cavity to press the base material when the mold is closed and having a recessed part defined on a press surface side to reduce deformation of the base material.
Abstract: A peroxide crosslinkable fluororubber composition comprising: (A) 0.1 to 2.5 parts by weight of a sodium salt or potassium salt of a saturated or unsaturated higher fatty acid; (B) (a) 0.1 to 3.5 parts by weight of a fluoropolyether derivative having a melting point of 70° C. or less, (b) 0.1 to 3.0 parts by weight of a poly-?-olefin oligomer, or (c) 0.1 to 2.0 parts by weight of an alkylamine compound having 4 to 30 carbon atoms; and (C) 0.1 to 5 parts by weight of an organic peroxide, based on 100 parts by weight of peroxide crosslinkable fluororubber. This fluororubber composition has excellent crosslinking rate, mold release properties, hardness, compression set characteristics, and the like that are required for molding processability.
Abstract: Damping stopper for a mechanism in which a housing and shaft are not only displaced axially relative to each other but but also rotated relative to each other. The damping stopper is attached to a space portion between an end surface portion on housing side and an end surface portion on shaft side which is displaced axially relative to the housing and is rotated relative to the housing and has a metal fitting on one of the end surface portions, an elastic body connected to the metal fitting, and a sliding member connected to the elastic body. The sliding member contacts the other end surface portion to contact/separate from the other end surface portion and the sliding member is slidable and rotatable relative to the other end surface portion when the shaft is rotated while the sliding member, containing resin component, contacts the other end surface portion.
Abstract: A method of manufacturing a separator assembly for fuel cell includes a separator assembly forming step in which a separator assembly including a first metal separator and a second metal separator each having a protruding bead portion is formed by joining together the surfaces of the first and second metal separators opposite from their respective bead portions protruding, and a preload applying step in which a pair of platens apply a preload in a thickness direction of the separator assembly to a bead seal section formed of one pair of the bead portions, and thereby the bead seal section is plastically deformed. In the preload applying step, the preload applied to a linear portion of the bead seal section is set to be smaller than the preload applied to a curve portion of the bead seal section.
Abstract: A gasket material, in which a crosslinked rubber layer compounding 30 to 200 parts by weight of titanium oxide based on 100 parts by weight of NBR or hydrogenated NBR is formed on a metal plate, improves blister resistance, and thus exhibits an excellent effect of preventing rubber peeling of the gasket in the engine and leading to an improvement of engine malfunction. Further, the use of NBR or hydrogenated NBR results in an advantage of low cost relative to that of fluororubber. Therefore, the gasket material of the present invention is effectively used as a cylinder head gasket.
Abstract: A seal ring is mounted and seated in a mounting groove provided in either one of an inner peripheral member and an outer peripheral member reciprocating relative to each other and brings the seal surface into close contact with the other one to seal a fluid. The seal ring is configured by a combination of two members of an inner peripheral side ring and an outer peripheral side ring which are rubber-like elastic bodies. The hardness of one member having a seal surface of the inner peripheral side ring and the outer peripheral side ring is set to be higher than that of the other member. On the contact surface between the inner peripheral side ring and the outer peripheral side ring, a recess-projection fitting portion restricting the positional shift in the axial direction between the inner peripheral side ring and the outer peripheral side ring is provided along the annular direction.
Abstract: A sealing apparatus using a gasket in which a gasket main body is integrally formed with a reinforcing ring, the gasket main body has a one-end-side seal bead and an other-end-side seal bead which are positioned on one end side and another end side of the reinforcing ring in an axial direction and are oriented in directions facing away from each other in the axial direction, the one-end-side seal bead is closely contacted on a bottom surfaced of an attachment recessed part formed in a housing, and the other-end-side seal bead is closely contacted on a cover which closes the attachment recessed part of the housing, wherein in a state of being attached in the attachment recessed part with the cover removed from the housing, at least a part of an outer peripheral portion of the gasket serves as a supportable portion by providing a flange consecutively provided on an outer periphery side of the reinforcing ring.
Abstract: A gasket 100 is configured to seal a gap between an installation member 200 and a fixation member 300 which are fixed to each other. The gasket 100 has an annular gasket main body 11 configured to be fitted into an annular groove 210 provided in the installation member 200 and configured to be in close contact with a bottom surface 210a of the annular groove 210 and with an end surface 310 of the fixation member 300, and an auxiliary seal portion 12 extending from the gasket main body 11 toward an opposite region, which is opposite to a sealed region. The auxiliary seal portion 12 is configured to be in close contact with an end surface 220 of the installation member 200 on the opposite region side of the annular groove 210 and with the end surface 310 of the fixation member 300.
Abstract: A vibration isolator includes: a vibration isolation member including a metal plate as a plate-shaped member, and an upper rubber layer and a lower rubber layer deposited on a top surface and a bottom surface of the metal plate; an insertion hole through which a fastening member for attaching the vibration isolation member to a sealing target, the insertion hole being provided on an outer peripheral side of the vibration isolation member; and a vibration isolation bead portion provided in at least part of a surrounding area around the insertion hole in the vibration isolation member.