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Seal ring
PATENTS Turbocharger compressor carbon face seal Applicant: Borgwarner Inc, USA In this design, a passive, progressively-applied contact face seal assembly is used to address blow-by between the rotating assembly and the housing of a turbocharger. The assembly is configured to avoid seal contact at low rotational speeds, resulting in less friction at start-up and improved turbocharger transient response. In addition, it is configured to provide increasing seal contact with increasing rotational speeds, whereby full sealing action is applied under high-speed, high-pressure conditions when blow-by potential is at a maximum. The assembly is used together with a clearance seal. Patent number: WO/2014/209852 Inventors: A. Kelly and J. Peter Publication date: 31 December 2014
Radial shaft seal Applicants: NIDEC GPM GmbH, and VR Automotive Dichtungssysteme GmbH – Germany This invention relates to a way of sealing a rotating shaft leading out from a space filled with a fluid medium. For example, it may involve sealing the drive shaft of a coolant pump. According to the patent, the aim of this invention is to devise a new type of radial shaft seal that minimises wear, especially the starting wear acting on the sealing lips in double-lip sealing systems, and enables end-ofline motor tests with coolant pumps without cooling liquid for up to several hours without damage occurring to the radial shaft seal. The patent describes a design that involves two
sealing bodies (8), an outer lip element (15) on the pressure side and an inner lip element (16) on the atmosphere side, each having a sealing cylinder resting on the shaft (3) or the sleeve (10) – arranged in a sealing housing (5) with a joined metal supporting body (11). The sealing cylinders have three adjoining regions such that on the pressure side and negative pressure side, conical inlet and outlet surfaces are provided, respectively. In each case, a cylindrical contact zone is present between the conical inlet surface and the conical outlet surface. A lubrication chamber (21) is defined by the outer lip (19), the supporting body (11), the inner lip element (16), with inner lip (20), and the shaft (3), or the sleeve (10), and is sealed on all sides. A lubricant medium that is able to flow at room temperature and which has a kinematic viscosity of 5000–1000 mm2/s at a residual excess pressure of 0.005–0.01 bar is present in the lubrication chamber. Patent number: WO/2014/206393 Inventors: A. Blechschmidt and M. Schaub Publication date: 31 December 2014
Seal for axial piston machine with vibration damping Applicant: Robert Bosch GmbH, Germany This patent provides details of a seal that possesses mechanical damping for an axial piston machine. The seal described includes a flat ring made from a first material. The ring has at least one bulge in the direction of one of the sealing surfaces. This bulge is designed to be supported, resiliently, on one of the two sealing surfaces under mechanical stress with pressure on the other sealing surface. The seal is characterised by a thickened portion, which circumferentially extends over the entire extent of the ring and which is made of a second material. The elasticity of this material is greater than that of the first material. Patent number: WO/2014/206714 Inventor: M. Greiner Publication date: 31 December 2014
Seal ring
Patent WO/2014/206393 provides details of a system for sealing a rotating shaft leading out from a space filled with a fluid medium. This figure shows the radial shaft seal according to the invention in the installed state after final assembly – that is, after being installed, for example, in a coolant pump.
14
Sealing Technology
Applicant: NTN Corp, Japan The seal ring described by this patent has a good balance of low oil leakage – which is the original purpose of a seal ring – and low torque, for improving fuel consumption. The seal ring is fitted in an annular groove in one member, either a housing having a shaft hole or a rotating shaft inserted through the shaft hole. The seal ring is in contact with the surface of the other member and also in contact (slidable) with a side-wall surface on the unsealed fluid
side of the annular groove – sealing an annular gap between these members. At least part of the inside diameter end of the ring side surface, which is the surface that slides with the sidewall, has a concave part that is V-shape along a ring circumferential direction and is not in contact with the side-wall surface. Patent number: WO/2015/002143 Inventors: T. Kondou and K. Kakehi Publication date: 8 January 2015
Dynamic seal tube for a downhole hammer drill Applicant: Drillroc Pneumatic Pty Ltd, Australia This invention pertains to a dynamic seal tube for use in pressurised fluid-driven downhole hammer drills. The seal tube slides within the bore of the piston and the anvil portion of the drill bit, and cooperatively acts to release different volumes of pressurised fluid from the lower chamber when the piston is in different predetermined positions. Patent number: WO/2015/003215 Inventor: T. Lorger Publication date: 8 January 2015
Pressure equalisers for shaft seals in a downhole gearbox Applicants: Schlumberger Canada Ltd, Canada; Services Petroliers Schlumberger, France; Schlumberger Holdings Ltd, Virgin (British) Islands; Schlumberger Technology Bv, The Netherlands; Prad Research and Development Ltd, Virgin (British) Islands; and Schlumberger Technology Corp, USA Details are provided of pressure equalisers for shaft seals used in a downhole gearbox. Various implementations prevent well fluid from entering a downhole gearbox through an output shaft seal, and prevent lubricating oil from leaking out of the gearbox through an input shaft seal. Small back-pressure pumps may be connected to rotating shafts inside the gearbox to equalise the local pressure on each side of these seals. A volume compensator is used at a selected point along a pressure gradient in a flow tube to equalise the pressure between shaft seals. Pressure tubes may be angled and transitioned in relation to the pumped fluid flow to modify fluid pressure in favour of shaft seal integrity. A set of input and output seals also may be connected by a fluid line to equilibrate pressure across all seals, and the fluid line may be favourably biased by a pressure gradient in the flow tube. Patent number: WO/2015/006325 Inventor: A. Watson Publication date: 8 January 2015
November 2015
Radial shaft seal Applicants: NIDEC GPM GmbH, and VR Automotive Dichtungssysteme GmbH – Germany This invention relates to a way of sealing a rotating shaft leading out from a space filled with a fluid medium. For example, it may involve sealing the drive shaft of a coolant pump. According to the patent, the aim of this invention is to devise a new type of radial shaft seal that minimises wear, especially the starting wear acting on the sealing lips in double-lip sealing systems, and enables end-ofline motor tests with coolant pumps without cooling liquid for up to several hours without damage occurring to the radial shaft seal. The patent describes a design that involves two
sealing bodies (8), an outer lip element (15) on the pressure side and an inner lip element (16) on the atmosphere side, each having a sealing cylinder resting on the shaft (3) or the sleeve (10) – arranged in a sealing housing (5) with a joined metal supporting body (11). The sealing cylinders have three adjoining regions such that on the pressure side and negative pressure side, conical inlet and outlet surfaces are provided, respectively. In each case, a cylindrical contact zone is present between the conical inlet surface and the conical outlet surface. A lubrication chamber (21) is defined by the outer lip (19), the supporting body (11), the inner lip element (16), with inner lip (20), and the shaft (3), or the sleeve (10), and is sealed on all sides. A lubricant medium that is able to flow at room temperature and which has a kinematic viscosity of 5000–1000 mm2/s at a residual excess pressure of 0.005–0.01 bar is present in the lubrication chamber. Patent number: WO/2014/206393 Inventors: A. Blechschmidt and M. Schaub Publication date: 31 December 2014
Seal for axial piston machine with vibration damping Applicant: Robert Bosch GmbH, Germany This patent provides details of a seal that possesses mechanical damping for an axial piston machine. The seal described includes a flat ring made from a first material. The ring has at least one bulge in the direction of one of the sealing surfaces. This bulge is designed to be supported, resiliently, on one of the two sealing surfaces under mechanical stress with pressure on the other sealing surface. The seal is characterised by a thickened portion, which circumferentially extends over the entire extent of the ring and which is made of a second material. The elasticity of this material is greater than that of the first material. Patent number: WO/2014/206714 Inventor: M. Greiner Publication date: 31 December 2014
Seal ring
Patent WO/2014/206393 provides details of a system for sealing a rotating shaft leading out from a space filled with a fluid medium. This figure shows the radial shaft seal according to the invention in the installed state after final assembly – that is, after being installed, for example, in a coolant pump.
14
Sealing Technology
Applicant: NTN Corp, Japan The seal ring described by this patent has a good balance of low oil leakage – which is the original purpose of a seal ring – and low torque, for improving fuel consumption. The seal ring is fitted in an annular groove in one member, either a housing having a shaft hole or a rotating shaft inserted through the shaft hole. The seal ring is in contact with the surface of the other member and also in contact (slidable) with a side-wall surface on the unsealed fluid
side of the annular groove – sealing an annular gap between these members. At least part of the inside diameter end of the ring side surface, which is the surface that slides with the sidewall, has a concave part that is V-shape along a ring circumferential direction and is not in contact with the side-wall surface. Patent number: WO/2015/002143 Inventors: T. Kondou and K. Kakehi Publication date: 8 January 2015
Dynamic seal tube for a downhole hammer drill Applicant: Drillroc Pneumatic Pty Ltd, Australia This invention pertains to a dynamic seal tube for use in pressurised fluid-driven downhole hammer drills. The seal tube slides within the bore of the piston and the anvil portion of the drill bit, and cooperatively acts to release different volumes of pressurised fluid from the lower chamber when the piston is in different predetermined positions. Patent number: WO/2015/003215 Inventor: T. Lorger Publication date: 8 January 2015
Pressure equalisers for shaft seals in a downhole gearbox Applicants: Schlumberger Canada Ltd, Canada; Services Petroliers Schlumberger, France; Schlumberger Holdings Ltd, Virgin (British) Islands; Schlumberger Technology Bv, The Netherlands; Prad Research and Development Ltd, Virgin (British) Islands; and Schlumberger Technology Corp, USA Details are provided of pressure equalisers for shaft seals used in a downhole gearbox. Various implementations prevent well fluid from entering a downhole gearbox through an output shaft seal, and prevent lubricating oil from leaking out of the gearbox through an input shaft seal. Small back-pressure pumps may be connected to rotating shafts inside the gearbox to equalise the local pressure on each side of these seals. A volume compensator is used at a selected point along a pressure gradient in a flow tube to equalise the pressure between shaft seals. Pressure tubes may be angled and transitioned in relation to the pumped fluid flow to modify fluid pressure in favour of shaft seal integrity. A set of input and output seals also may be connected by a fluid line to equilibrate pressure across all seals, and the fluid line may be favourably biased by a pressure gradient in the flow tube. Patent number: WO/2015/006325 Inventor: A. Watson Publication date: 8 January 2015
November 2015