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stator seal used in a gas turbine
PATENTS durability and longevity in high-pressure applications. Such applications may include, but are not limited to, hydraulic pumps, motors, actuators and connections. Patent number: WO/2011/075372 Inventor: C.J. Stickling Publication date: 23 June 2011
PATENTS Oil seal structure Applicant: Toyota Jidosha Kabushiki Kaisha, Japan This patent describes a lip seal assembly that is fitted within what is described as a ‘ring gear’. From the drawings it appears to be fitted to a rather complex assembly on the end of a crankshaft – perhaps a dual-mass flywheel. This may well indicate that the seal operates on a shaft with an oscillating motion. The main area of interest is that a textured surface is formed on the shaft in the area between the sealing and wiper lips. The texture profiles are described in some detail, and there appears to be both circumferential and radial texture patterns. Patent number: WO/2011/074069 Inventor: H. Michioka Publication date: 23 June 2011 Technical Editor: Certain assumptions have been made as only the abstract of this Japanese patent was available in English.
A flexible seal has been developed that adheres to the inner wall of a tube, even if the internal diameter of the tube changes. Patent WO/2011/074502 has further details.
same shape as each other. The seal members are disposed in such a way that one is located on top of the other, so that one seal member is externally attached while the other seal member is internally attached. Both are equipped with a number of similarly shaped slit sections that extend from near one opening section to near the other opening section. They are also positioned out of phase about a central axis. Patent number: WO/2011/074502 Inventor: F. Urakami Publication date: 23 June 2011
Press-in-place seal
Patent WO/2011/074069 provides details of a lip seal with a textured surface formed on the shaft in the area between the sealing and wiper lips.
Flexible seal Applicant: Urakami Llc, Japan Disclosed are details of a flexible seal that adheres to the inner wall of a tube, even if the internal diameter of the tube changes. This self-sealing structure comprises two seal members, both of which are shaped like hollow bowls. They are made from a flexible material that has annular openings at both extremes, and they form the
January 2012
Applicant: Caterpillar Inc, USA This patent describes a press-in-place (PIP) seal. It is approximately heart-shaped in profile and is characterised by having two sealing beads on each sealing surface. The heart profile provides a top sealing surface that is wider than the surface at the bottom. Many seals include spaced flexible projections that retain the seal in a channel of a structure during assembly. At a higher pressure, such as 27.6 MPa or greater, such spaced flexible projections may affect the contact pressure between the seal and the channel – which may result in leakage. An intermittent projection may act as a stress raiser, causing the seal to fail. These seals may also fail because of movement in response to an applied pressure. It is claimed that when the PIP seal is installed in a compressed state it is subjected to a pressure of about 27.6 MPa, and the highest strain experienced by the seal is located within the seal. The groove has a channel width equal to the seal width and a channel height that is around 75% of the height of the seal. It is believed that the features of the PIP seal, which forms the subject of this patent, provide superior sealing action, and increased
The cross-section of the press-in-place (PIP) seal that forms the subject of patent WO/2011/075372.
Valve and sealing ring Applicant: Metso Automation Oy, Finland This invention relates to a valve and a sealing ring that has at least a first sealing point and a second sealing point. In all situations, the first and second sealing points are on a different radius. They also can move relative to each other in the axial direction as they are mounted on a bellows. In the illustrations that are presented, the sealing action is applied axially against a radial flange and radially in a bore. Patent number: WO/2011/076992 Inventor: T. Laitinen Publication date: 30 June 2011
Ceramic layer for rotor/stator seal used in a gas turbine Applicant: Lufthansa Technik Ag, Germany This invention relates to a method of applying a ceramic layer to the surfaces of sealing segments that are arranged on the inner circumference of the gas-turbine housing part of a rotor/ stator seal. The ceramic layer is applied while the sealing segments are installed in the turbine housing part. Patent number: WO/2011/076549 Inventors: J.O. Peters, V. Tiedemann, C.W, Siry and D. Stunz Publication date: 30 June 2011
Sealing Technology
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PATENTS Oil seal structure Applicant: Toyota Jidosha Kabushiki Kaisha, Japan This patent describes a lip seal assembly that is fitted within what is described as a ‘ring gear’. From the drawings it appears to be fitted to a rather complex assembly on the end of a crankshaft – perhaps a dual-mass flywheel. This may well indicate that the seal operates on a shaft with an oscillating motion. The main area of interest is that a textured surface is formed on the shaft in the area between the sealing and wiper lips. The texture profiles are described in some detail, and there appears to be both circumferential and radial texture patterns. Patent number: WO/2011/074069 Inventor: H. Michioka Publication date: 23 June 2011 Technical Editor: Certain assumptions have been made as only the abstract of this Japanese patent was available in English.
A flexible seal has been developed that adheres to the inner wall of a tube, even if the internal diameter of the tube changes. Patent WO/2011/074502 has further details.
same shape as each other. The seal members are disposed in such a way that one is located on top of the other, so that one seal member is externally attached while the other seal member is internally attached. Both are equipped with a number of similarly shaped slit sections that extend from near one opening section to near the other opening section. They are also positioned out of phase about a central axis. Patent number: WO/2011/074502 Inventor: F. Urakami Publication date: 23 June 2011
Press-in-place seal
Patent WO/2011/074069 provides details of a lip seal with a textured surface formed on the shaft in the area between the sealing and wiper lips.
Flexible seal Applicant: Urakami Llc, Japan Disclosed are details of a flexible seal that adheres to the inner wall of a tube, even if the internal diameter of the tube changes. This self-sealing structure comprises two seal members, both of which are shaped like hollow bowls. They are made from a flexible material that has annular openings at both extremes, and they form the
January 2012
Applicant: Caterpillar Inc, USA This patent describes a press-in-place (PIP) seal. It is approximately heart-shaped in profile and is characterised by having two sealing beads on each sealing surface. The heart profile provides a top sealing surface that is wider than the surface at the bottom. Many seals include spaced flexible projections that retain the seal in a channel of a structure during assembly. At a higher pressure, such as 27.6 MPa or greater, such spaced flexible projections may affect the contact pressure between the seal and the channel – which may result in leakage. An intermittent projection may act as a stress raiser, causing the seal to fail. These seals may also fail because of movement in response to an applied pressure. It is claimed that when the PIP seal is installed in a compressed state it is subjected to a pressure of about 27.6 MPa, and the highest strain experienced by the seal is located within the seal. The groove has a channel width equal to the seal width and a channel height that is around 75% of the height of the seal. It is believed that the features of the PIP seal, which forms the subject of this patent, provide superior sealing action, and increased
The cross-section of the press-in-place (PIP) seal that forms the subject of patent WO/2011/075372.
Valve and sealing ring Applicant: Metso Automation Oy, Finland This invention relates to a valve and a sealing ring that has at least a first sealing point and a second sealing point. In all situations, the first and second sealing points are on a different radius. They also can move relative to each other in the axial direction as they are mounted on a bellows. In the illustrations that are presented, the sealing action is applied axially against a radial flange and radially in a bore. Patent number: WO/2011/076992 Inventor: T. Laitinen Publication date: 30 June 2011
Ceramic layer for rotor/stator seal used in a gas turbine Applicant: Lufthansa Technik Ag, Germany This invention relates to a method of applying a ceramic layer to the surfaces of sealing segments that are arranged on the inner circumference of the gas-turbine housing part of a rotor/ stator seal. The ceramic layer is applied while the sealing segments are installed in the turbine housing part. Patent number: WO/2011/076549 Inventors: J.O. Peters, V. Tiedemann, C.W, Siry and D. Stunz Publication date: 30 June 2011
Sealing Technology
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