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Nano-cellular seal materials
PATENTS otherwise interference fitted into position – locking them to rotate with the rotor. This has raised concerns about stresses, as the rotor hub flexes. The top illustration in the accompanying figure shows a portion of a compressor rotor (60). A slot (200) receives blades. As shown, a hub (62) extends between the rotor, and may extend to the next downstream rotor. However, in one embodiment the hub extends radially inwards and abuts a portion of a tie shaft. In this embodiment, the rotor may be located furthest downstream. A segmented seal component (64) is mounted in a space between a ledge (99) on the rotor and a portion (68) of the hub. A space (66) is formed within the hub at a location adjacent to the rotor, and beneath this ledge. As shown in the bottom illustration, the seal has knife-edge portions (80) facing an abradable material (82). This material may be associated with a static location in the compressor section, such as associated with a radially inner portion of a vane. The seal (64) has an inwardly extending portion (101), defining an outer face (104) and an inner face (106). It is clear from the diagram that the distance between the faces (104 & 106) is less than the distance between the outer face (102) of the portion (68) of the hub (62) and inner face (100) of the rotor ledge (99). This means that the seal is free to “flow” between these two members, as the rotor, or hub, flexes during operation. A radially inwardly extending inner lip (108) is located within the space (66). The seal is thus able to float, and will not bind nor transmit stresses between the hub and rotor. Patent number: WO/2014/025439
Inventors: N. Aiello and C. Lee Publication date: 13 February 2014 enilst the bottom one shows detail of the eal.
Display seal Applicant: Sharp Kabushiki Kaisha, Japan The aim of this invention is to eliminate the formation of dew condensation in a space between a protection plate, touch panel or the like, and the surface of a display used in an electronic device. It also aims to prevent foreign material from entering these areas from the outside. The patent describes a display apparatus, with a display section, protection plate and seal material. The display section has a surface for displaying data, whilst the protection plate is disposed to cover the display surface. The seal material is positioned between the display section and the protection plate, such that, in planar view from above the display surface, the seal material surrounds the display surface, and forms a path that connects an inner region, surrounded by the seal material, and an outer region (outside of the seal material), to each other in a pattern that is not necessarily rectilinear. Patent number: WO/2014/024759 Inventors: K. Murakami and A. Sugimoto Publication date: 13 February 2014
Nano-cellular seal materials Applicant: United Technologies Corp, USA A high-temperature nano-cellular foam seal material has been developed. It has pores, interconnecting ligaments and nodes where three or more ligaments intersect. The ligament cross-section thickness is less than 200 μm and the distance between nodes is less than 1000 μm. This material’s high compliance and elastic springback characteristics can be tailored to a specific application by varying the foam architecture. Metal, intermetallic and ceramic nano-cellular foams can be used as seal materials in, for example, paths taken by hot gas in a turbine engine. Patent number: WO/2014/025573 Inventors: J.T. Beals, P. Sheedy, D.M. Shah and P.G. Smith Publication date: 13 February 2014
composition exhibits resistance to deformation because of the shape-effect of the filler. It thereby enables deformation, in the sliding direction of the sliding surface of an oil seal, to be suppressed and achieves a reduction in torque after abrasion by generating a good lubricated state on the sliding surface. More specifically, it is possible to achieve a reduction in friction whilst maintaining sealing properties by means of an increase in oilpumping action, from when the oil seal is initially used to after it suffers abrasion. Patent number: WO/2014/024661 Inventor: K. Yoshimura Publication date: 13 February 2014
Rotary valve seal member Applicant: Nippon Thermostat Co Ltd, Japan The main objective of this invention is to create a rotary valve seal member with which a reliable seal can be obtained regardless of the type of movement of the valve body, by holding the outer surface of the valve body, which rotates, pivots or slides. Referring to the accompanying figure, the seal member (20), which is in sliding contact with the outer surface of the valve body, is capable of rotating, pivoting or sliding inside the housing of a rotary valve. Its three-dimensional structure has a circular body with a cross-section that is ovalshaped (22) and rectangular (21), and is integrally formed from an elastic material. The oval-shaped section (22) is positioned in the normal direction with respect to the outer surface of the valve body, and a bulging section – of the leading edge of the
Fluororubber composition
Patent WO/2014/025439 describes a floating, knife-edge seal for use in a turbine engine. It is designed not to bind or transmit stresses between the hub (62) and rotor (60). The top illustration shows a portion of the compressor rotor and seal, whilst the bottom one shows detail of the seal.
14
Sealing Technology
Applicant: NOK Corp, Japan The subject of this patent is a fluororubber composition containing, relative to 100 parts by weight of a fluororubber, 1–100 parts by weight of a needle-like filler, or fibrous filler, having an average particle diameter of 5 μm or less, an average particle length of 40–60 μm and an aspect ratio of 10–12. According to the patent, a vulcanised fluororubber article moulded from this
The main objective of this invention – detailed by patent WO/2014/024503 – is to create a rotary valve seal. The design aims to create a reliable seal regardless of the way in which the valve body moves.
September 2014
Inventors: N. Aiello and C. Lee Publication date: 13 February 2014 enilst the bottom one shows detail of the eal.
Display seal Applicant: Sharp Kabushiki Kaisha, Japan The aim of this invention is to eliminate the formation of dew condensation in a space between a protection plate, touch panel or the like, and the surface of a display used in an electronic device. It also aims to prevent foreign material from entering these areas from the outside. The patent describes a display apparatus, with a display section, protection plate and seal material. The display section has a surface for displaying data, whilst the protection plate is disposed to cover the display surface. The seal material is positioned between the display section and the protection plate, such that, in planar view from above the display surface, the seal material surrounds the display surface, and forms a path that connects an inner region, surrounded by the seal material, and an outer region (outside of the seal material), to each other in a pattern that is not necessarily rectilinear. Patent number: WO/2014/024759 Inventors: K. Murakami and A. Sugimoto Publication date: 13 February 2014
Nano-cellular seal materials Applicant: United Technologies Corp, USA A high-temperature nano-cellular foam seal material has been developed. It has pores, interconnecting ligaments and nodes where three or more ligaments intersect. The ligament cross-section thickness is less than 200 μm and the distance between nodes is less than 1000 μm. This material’s high compliance and elastic springback characteristics can be tailored to a specific application by varying the foam architecture. Metal, intermetallic and ceramic nano-cellular foams can be used as seal materials in, for example, paths taken by hot gas in a turbine engine. Patent number: WO/2014/025573 Inventors: J.T. Beals, P. Sheedy, D.M. Shah and P.G. Smith Publication date: 13 February 2014
composition exhibits resistance to deformation because of the shape-effect of the filler. It thereby enables deformation, in the sliding direction of the sliding surface of an oil seal, to be suppressed and achieves a reduction in torque after abrasion by generating a good lubricated state on the sliding surface. More specifically, it is possible to achieve a reduction in friction whilst maintaining sealing properties by means of an increase in oilpumping action, from when the oil seal is initially used to after it suffers abrasion. Patent number: WO/2014/024661 Inventor: K. Yoshimura Publication date: 13 February 2014
Rotary valve seal member Applicant: Nippon Thermostat Co Ltd, Japan The main objective of this invention is to create a rotary valve seal member with which a reliable seal can be obtained regardless of the type of movement of the valve body, by holding the outer surface of the valve body, which rotates, pivots or slides. Referring to the accompanying figure, the seal member (20), which is in sliding contact with the outer surface of the valve body, is capable of rotating, pivoting or sliding inside the housing of a rotary valve. Its three-dimensional structure has a circular body with a cross-section that is ovalshaped (22) and rectangular (21), and is integrally formed from an elastic material. The oval-shaped section (22) is positioned in the normal direction with respect to the outer surface of the valve body, and a bulging section – of the leading edge of the
Fluororubber composition
Patent WO/2014/025439 describes a floating, knife-edge seal for use in a turbine engine. It is designed not to bind or transmit stresses between the hub (62) and rotor (60). The top illustration shows a portion of the compressor rotor and seal, whilst the bottom one shows detail of the seal.
14
Sealing Technology
Applicant: NOK Corp, Japan The subject of this patent is a fluororubber composition containing, relative to 100 parts by weight of a fluororubber, 1–100 parts by weight of a needle-like filler, or fibrous filler, having an average particle diameter of 5 μm or less, an average particle length of 40–60 μm and an aspect ratio of 10–12. According to the patent, a vulcanised fluororubber article moulded from this
The main objective of this invention – detailed by patent WO/2014/024503 – is to create a rotary valve seal. The design aims to create a reliable seal regardless of the way in which the valve body moves.
September 2014