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Rotary seal
PATENTS that has seal grooves on the outside and inside diameters. O-rings are fitted in the grooves and there may be two or three grooves each side, with additional groove providing for additional seals that, it is claimed, will provide improved sealing. The number of grooves can for instance be selected depending on the pressure to be sealed. The O-rings may be replaced by square rings or O-rings with lips. The grooves are designed to provide a snug fit for the O-rings to prevent them being removed under pressure with an extending portion to provide a seal. The holder is made from aluminium or a plastic. Publication number: WO /2008/131464 Publication date: 30 October 2008 Editor’s comment: I have tried to directly précis the contents of this patent. I have not found any claim that it may be an improvement on currently available hydraulic seals.
ponents and oil passages. There is an inner U section ring that has radial holes for the passage of oil. Two rectangular seal rings (8, 9) are separated by a series of distance pieces (10). The seal rings and distance pieces may be manufactured from polyamidimide. Publication number: WO/2008/132014 Inventors: D. Illerhaus et al. Publication date: 6 November 2008
Rotary seal Applicants/ Inventors: C. de Champeaux et al., France This is a seal for a helicopter rotor assembly which allows gas to be fed up the drive shaft and into the blades. It is a radial labyrinth seal. Details of the teeth designs are shown. Publication number: WO/2008/132315 Publication date: 6 November 2008
Double seal with pressurised lip
An example of the hydraulic seal described in WO /2008/131464, showing both O-ring and square seals installed on the holder.
Oil flow seal between fixed and rotating parts Applicant: ZF Friedrichshafen AG, Germany This patent relates to a seal for vehicle transmissions where there are relatively rotating com-
Applicant: Turbomeca, France A pair of lip seals are proposed arranged back to back on the output shaft of a helicopter gearbox. Gas is fed between the seals and escapes both under the inner lip into the gearbox and to the atmosphere past the outer lip. The purpose is to provide an effective seal, retention of oil and exclusion of dust etc, but with a low friction and reduction of shaft wear. A diaphragm is fitted in the gas supply to limit the flow should a seal fail. Publication number: WO/2008/132410 Inventors: M. Fos et al. Publication date: 6 November 2008
Cap with a seal Applicant: Comercial Catorce De Febrero SA, Spain A cap for a container has integral seals. It is also designed so that the two parts of the cap remain joined to aid complete removal of the plastic cap for recycling. Publication number: WO/2008/132665 Inventor: D. Cano Ongay Publication date: 6 November 2008
Publication number: WO/2008/132958 Inventor: H. Takahashi Publication date: 6 November 2008
Bearing or seal using carbon-based sliding member Applicant: Ebara Corporation, Japan This patent describes a material that can be used as a bearing or seal in pure water environments. It has an electric resistance in the range 1–18.25 MΩ/cm. A diamond like carbon film is formed on one of the surfaces. The seal illustrated has spiral grooves across the entire radial surface. Publication number: WO/2008/133197 Inventors: K. Sugiyama et al. Publication date: 6 November 2008
Seal for drill string Applicant: Siem Wis AS, Norway A sealing arrangement for dynamic sealing around a drill stem or coiled tubing is described. It is intended to provide an economic and low friction method of providing intervention in a fluid containing well. A series of elastomer washers are illustrated. Lubricant and friction reducing additives can be introduced between sets of the elastomer washers. A number of variants are shown. Publication number: WO/2008/133523 Inventors: P.E. Edvardsen et al. Publication date: 6 November 2008
Compliant foil fluid film radial bearing or seal Applicant: Capstone Turbine Corporation, USA A segmented seal for high speed rotary applications is described. Compliant foil is energised
Mechanical seal device
A seal for oil passages within a vehicle transmission, WO/2008/132014.
March 2009
Applicant: Eagle Industry Co Ltd, Japan A mechanical seal arrangement is described that is presumably intended for corrosive service. Both the seal plate and the rotary seal face retaining collar are manufactured from plastic. The seal rings are described as non-corrosive material. Considerable detail of the seal plate and seal ring collar are included and a number of different arrangements illustrated.
A section of a segmented foil seal with corrugated foil energiser, WO/2008/134142.
Sealing Technology
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ponents and oil passages. There is an inner U section ring that has radial holes for the passage of oil. Two rectangular seal rings (8, 9) are separated by a series of distance pieces (10). The seal rings and distance pieces may be manufactured from polyamidimide. Publication number: WO/2008/132014 Inventors: D. Illerhaus et al. Publication date: 6 November 2008
Rotary seal Applicants/ Inventors: C. de Champeaux et al., France This is a seal for a helicopter rotor assembly which allows gas to be fed up the drive shaft and into the blades. It is a radial labyrinth seal. Details of the teeth designs are shown. Publication number: WO/2008/132315 Publication date: 6 November 2008
Double seal with pressurised lip
An example of the hydraulic seal described in WO /2008/131464, showing both O-ring and square seals installed on the holder.
Oil flow seal between fixed and rotating parts Applicant: ZF Friedrichshafen AG, Germany This patent relates to a seal for vehicle transmissions where there are relatively rotating com-
Applicant: Turbomeca, France A pair of lip seals are proposed arranged back to back on the output shaft of a helicopter gearbox. Gas is fed between the seals and escapes both under the inner lip into the gearbox and to the atmosphere past the outer lip. The purpose is to provide an effective seal, retention of oil and exclusion of dust etc, but with a low friction and reduction of shaft wear. A diaphragm is fitted in the gas supply to limit the flow should a seal fail. Publication number: WO/2008/132410 Inventors: M. Fos et al. Publication date: 6 November 2008
Cap with a seal Applicant: Comercial Catorce De Febrero SA, Spain A cap for a container has integral seals. It is also designed so that the two parts of the cap remain joined to aid complete removal of the plastic cap for recycling. Publication number: WO/2008/132665 Inventor: D. Cano Ongay Publication date: 6 November 2008
Publication number: WO/2008/132958 Inventor: H. Takahashi Publication date: 6 November 2008
Bearing or seal using carbon-based sliding member Applicant: Ebara Corporation, Japan This patent describes a material that can be used as a bearing or seal in pure water environments. It has an electric resistance in the range 1–18.25 MΩ/cm. A diamond like carbon film is formed on one of the surfaces. The seal illustrated has spiral grooves across the entire radial surface. Publication number: WO/2008/133197 Inventors: K. Sugiyama et al. Publication date: 6 November 2008
Seal for drill string Applicant: Siem Wis AS, Norway A sealing arrangement for dynamic sealing around a drill stem or coiled tubing is described. It is intended to provide an economic and low friction method of providing intervention in a fluid containing well. A series of elastomer washers are illustrated. Lubricant and friction reducing additives can be introduced between sets of the elastomer washers. A number of variants are shown. Publication number: WO/2008/133523 Inventors: P.E. Edvardsen et al. Publication date: 6 November 2008
Compliant foil fluid film radial bearing or seal Applicant: Capstone Turbine Corporation, USA A segmented seal for high speed rotary applications is described. Compliant foil is energised
Mechanical seal device
A seal for oil passages within a vehicle transmission, WO/2008/132014.
March 2009
Applicant: Eagle Industry Co Ltd, Japan A mechanical seal arrangement is described that is presumably intended for corrosive service. Both the seal plate and the rotary seal face retaining collar are manufactured from plastic. The seal rings are described as non-corrosive material. Considerable detail of the seal plate and seal ring collar are included and a number of different arrangements illustrated.
A section of a segmented foil seal with corrugated foil energiser, WO/2008/134142.
Sealing Technology
13