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Transition-to-turbine seal assembly
PATENTS a part. The method involves a step of dipping the part (to be checked) in a penetrant, which contains a compound that is capable of reacting to light. In a second step, the part is cut and the connection is checked. The final step involves checking for the presence of the penetrant under a light source (which is capable of exciting the penetrant). Patent number: WO/2016/034808 Inventors: J.Y.M.R. Berton and P. Cendrier Publication date: 10 March 2016
Sealing arrangement with a pressure-activated pre-tensioning element Applicant: Trelleborg Sealing Solutions Germany GmbH, Germany This patent pertains to a sealing arrangement with a pressure-activated pre-tensioning element. The arrangement includes a first machine part (12) and a second machine part (14). These are arranged in such a way that they are spaced apart from each other, forming a sealing gap (16), and movable relative to each other along a movement axis (18). A sealing element (20) that has a sealing lip (30), is arranged in a plurality of grooves (24) of the seal-holding structure
(22) of the first machine part (12), held in a press-fitting manner. The sealing lip (30) extends in the axial direction from the sealholding structure. A pre-tensioning element (34) is arranged in the retaining groove (32) of the first machine part (12) and by means of which the sealing lip (30) can be pretensioned against a sealing surface (38) of the second machine part, in order to seal a highpressure region (H), where an operating pressure is applied, with respect to a low-pressure region (N) of the sealing arrangement (10). The retaining groove (32) has a wedge guiding surface (40 & 42) for the pre-tensioning element (34), which is arranged so that it runs oblique, at an angle α, where α < 90º, to the movement axis (18). In addition, the pre-tensioning element (34) can be moved against, and along, the wedge guiding surface (40 & 42) by the application of operating pressure (P1 & Pmax) on the high-pressure side in order to pre-tension the sealing lip (30) against the sealing surface (38) using a pressure force (Fquer & Fquer.max) derived from the operating pressure (P1 & Pmax) Patent number: WO/2016/034474 Inventors: H. Jordan and E. Seeling Publication date: 10 March 2016
Transition-to-turbine seal assembly Applicants: Siemens Aktiengesellschaft, Germany; and Siemens Energy Inc, USA A transition-to-turbine seal assembly forms the subject of this patent. Seal members may include one or more anchoring tabs, affixed only to an associated transition and not to a neighbouring transition. In this way the seal members may be practically free from high stress levels because of the differing motion that can arise between neighbouring transitions. In addition, the seal members may include articulating segments that are arranged to provide a respective degree of freedom along a desired direction. Patent number: WO/2016/036382 Inventors: R.H. Bartley, M. Hase, A.J. Weaver and L.N. Williams Publication date: 10 March 2016
Seal member Patent WO/2016/034474 provides details of a sealing arrangement with a pressureactivated pre-tensioning element (34). The pre-tensioning element can be moved against, and along, the wedge guiding surface (40 & 42) by the application of operating pressure (P1 & Pmax), on the high-pressure side, in order to pre-tension the sealing lip (30) against the sealing surface (38).
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Sealing Technology
Applicant: Yazaki Corp, Japan The seal member that is detailed by this patent comprises a silicone rubber and polyrotaxane. It contains 3–10 parts by mass of polyrotaxane relative to 100 parts by mass of the silicone rubber. This constitution enables the rubber material to be deformed, and fol-
low easily in accordance with stress caused by the insertion/removal of a terminal metal fitting, or the like. Consequently, it becomes possible to prevent the seal member from being scratched easily. Patent number: WO/2016/035649 Inventor: Y. ooki Publication date: 10 March 2016
Dynamic seal Applicant: Aktiebolaget SKF, Sweden This invention relates generally to the field of seals, but in particular to an improved dynamic seal. This dynamic seal may find use, for example, in a rolling element bearing. Elastomer seals have remained popular for a number of dynamic sealing applications by virtue of a number of beneficial properties, including good sealing performance, resistance to oils at elevated temperatures and low cost. However, one drawback is the necessity to maintain constant lubrication to avoid the high friction experienced when elastomers are run dry or in a starved condition. Traditionally, two alternative methods of lubrication are adopted for such seals: oil lubrication and grease lubrication. Oil lubrication enables the seal to be run at higher speeds with typically lower friction. However, it also necessitates the use of a more elaborate and expensive pumping system in order to ensure that a layer of lubricating oil is maintained at the contact surface. Grease lubrication offers lower cost and convenience, but typically offers a slightly lower performance and may need to be changed during the service life of the seal. Grease systems commonly show a limited lifetime as a consequence of the grease being mobile in the vicinity of the sealing surface, causing eventual starvation of lubricant. There is a need for a seal that will overcome, or at least mitigate, some or all of the problems associated with the seals of the prior art, or at least provide a useful or optimised alternative. In a first aspect this invention provides details of a dynamic seal that has a contact surface comprising a fabric, wherein a fatty acid ester is incorporated into the fabric. In use, when the dynamic seal is loaded with lubricating oil, the fatty acid ester at the contact surface may maintain a lubricating layer of oil molecules (at the contact surface). As a result, the friction of the dynamic seal is reduced, thereby increasing its working lifetime and reducing the energy required to cause relative motion of the sliding surfaces. Patent number: WO/2016/037652 Inventors: S. Barbera and W. Allen Publication date: 17 March 2016
January 2017
Sealing arrangement with a pressure-activated pre-tensioning element Applicant: Trelleborg Sealing Solutions Germany GmbH, Germany This patent pertains to a sealing arrangement with a pressure-activated pre-tensioning element. The arrangement includes a first machine part (12) and a second machine part (14). These are arranged in such a way that they are spaced apart from each other, forming a sealing gap (16), and movable relative to each other along a movement axis (18). A sealing element (20) that has a sealing lip (30), is arranged in a plurality of grooves (24) of the seal-holding structure
(22) of the first machine part (12), held in a press-fitting manner. The sealing lip (30) extends in the axial direction from the sealholding structure. A pre-tensioning element (34) is arranged in the retaining groove (32) of the first machine part (12) and by means of which the sealing lip (30) can be pretensioned against a sealing surface (38) of the second machine part, in order to seal a highpressure region (H), where an operating pressure is applied, with respect to a low-pressure region (N) of the sealing arrangement (10). The retaining groove (32) has a wedge guiding surface (40 & 42) for the pre-tensioning element (34), which is arranged so that it runs oblique, at an angle α, where α < 90º, to the movement axis (18). In addition, the pre-tensioning element (34) can be moved against, and along, the wedge guiding surface (40 & 42) by the application of operating pressure (P1 & Pmax) on the high-pressure side in order to pre-tension the sealing lip (30) against the sealing surface (38) using a pressure force (Fquer & Fquer.max) derived from the operating pressure (P1 & Pmax) Patent number: WO/2016/034474 Inventors: H. Jordan and E. Seeling Publication date: 10 March 2016
Transition-to-turbine seal assembly Applicants: Siemens Aktiengesellschaft, Germany; and Siemens Energy Inc, USA A transition-to-turbine seal assembly forms the subject of this patent. Seal members may include one or more anchoring tabs, affixed only to an associated transition and not to a neighbouring transition. In this way the seal members may be practically free from high stress levels because of the differing motion that can arise between neighbouring transitions. In addition, the seal members may include articulating segments that are arranged to provide a respective degree of freedom along a desired direction. Patent number: WO/2016/036382 Inventors: R.H. Bartley, M. Hase, A.J. Weaver and L.N. Williams Publication date: 10 March 2016
Seal member Patent WO/2016/034474 provides details of a sealing arrangement with a pressureactivated pre-tensioning element (34). The pre-tensioning element can be moved against, and along, the wedge guiding surface (40 & 42) by the application of operating pressure (P1 & Pmax), on the high-pressure side, in order to pre-tension the sealing lip (30) against the sealing surface (38).
14
Sealing Technology
Applicant: Yazaki Corp, Japan The seal member that is detailed by this patent comprises a silicone rubber and polyrotaxane. It contains 3–10 parts by mass of polyrotaxane relative to 100 parts by mass of the silicone rubber. This constitution enables the rubber material to be deformed, and fol-
low easily in accordance with stress caused by the insertion/removal of a terminal metal fitting, or the like. Consequently, it becomes possible to prevent the seal member from being scratched easily. Patent number: WO/2016/035649 Inventor: Y. ooki Publication date: 10 March 2016
Dynamic seal Applicant: Aktiebolaget SKF, Sweden This invention relates generally to the field of seals, but in particular to an improved dynamic seal. This dynamic seal may find use, for example, in a rolling element bearing. Elastomer seals have remained popular for a number of dynamic sealing applications by virtue of a number of beneficial properties, including good sealing performance, resistance to oils at elevated temperatures and low cost. However, one drawback is the necessity to maintain constant lubrication to avoid the high friction experienced when elastomers are run dry or in a starved condition. Traditionally, two alternative methods of lubrication are adopted for such seals: oil lubrication and grease lubrication. Oil lubrication enables the seal to be run at higher speeds with typically lower friction. However, it also necessitates the use of a more elaborate and expensive pumping system in order to ensure that a layer of lubricating oil is maintained at the contact surface. Grease lubrication offers lower cost and convenience, but typically offers a slightly lower performance and may need to be changed during the service life of the seal. Grease systems commonly show a limited lifetime as a consequence of the grease being mobile in the vicinity of the sealing surface, causing eventual starvation of lubricant. There is a need for a seal that will overcome, or at least mitigate, some or all of the problems associated with the seals of the prior art, or at least provide a useful or optimised alternative. In a first aspect this invention provides details of a dynamic seal that has a contact surface comprising a fabric, wherein a fatty acid ester is incorporated into the fabric. In use, when the dynamic seal is loaded with lubricating oil, the fatty acid ester at the contact surface may maintain a lubricating layer of oil molecules (at the contact surface). As a result, the friction of the dynamic seal is reduced, thereby increasing its working lifetime and reducing the energy required to cause relative motion of the sliding surfaces. Patent number: WO/2016/037652 Inventors: S. Barbera and W. Allen Publication date: 17 March 2016
January 2017