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Seal system for gear pumps
PATENTS Axial face seal assemblies Applicant: ITT Manufacturing Enterprises Inc, USA This invention relates to an axial face seal arrangement. A single-spring unbalanced component mechanical seal is described by the patent. A feature of this design is a drive lug arrangement, which includes, what is termed, a wear protection pin. This pin is visible through a slot in the rear of the seal assembly. Patent number: WO/2010/132010 Inventors: J. Johansson and J. Fondelius Publication date: 11 November 2010
Seal system for gear pumps A retractable mechanical seal has been developed which uses a centrifugal actuator (20) to push together the faces during shaft rotation. Patent WO/2010/130969 has further details.
Patent number: WO/2010/129189 Inventors: E.S. Czechowski, P. Leising and N.P. Vetter Publication date: 11 November 2010 Technical Editor’s comment: I think the point of this patent is that it is used in a relatively low-cost application where only a single, dry gas seal may be used.
Flat seal composed of a sealing bead and embossing Applicant: Federal-Mogul Sealing Systems GmbH, Germany A method of embossing the layers of a multi-layered steel head-gasket is covered by this patent. The embossing can provide detents and studs, which are used to locate the layers relative to each other. Patent number: WO/2010/130469 Inventor: K. Schmitt Publication date: 18 November 2010
Mechanical seal assembly Applicant: John Crane UK Ltd, UK A mechanical seal assembly has been developed in which the seal faces are designed to separate when shaft rotation stops and sealing engagement is re-established when the machine is started. The stationary seal ring (50) has limited axial movement. The rotating seal ring (30) has an external secondary seal on an inclined plane. This encourages retraction of the seal face. What is described as a centrifugal actuator (20) pressurises the rotary face into engagement when the machine is started. A range of potential pumping features for the centrifugal actuator are also described. Patent number: WO/2010/130969 Inventors: N.D. Quarmby and K. Klintenstedt Publication date: 11 November 2010
Applicant: Illinois Tool Works Inc, USA This invention relates to sealing systems for gear pumps used to convey a (coating) material in a coating operation. A dual-seal system, using springenergised U-rings is described. A flushing medium is fed into the inter-seal space to flush the coating material away from the seals. The design of the seals used to facilitate flushing is described. Some alternative arrangements are also illustrated. Patent number: WO/2010/132154 Inventors: J.F. Schaupp and M.J. Selmek Publication date: 11 November 2010
Water seal plug and connector Applicants: Yazaki Corp and NOK Corp – Japan The purpose of this invention is to provide an improved watertight connection for a cable that is entering a terminal box, and also reduce the insertion effort required when fitting this cable through the seal. The seal has a coaxial construction with inner and outer portions of elastomer set around a plastic sleeve. The lips on the elastomer seal are designed to optimise fitting and sealing performance. Patent number: WO/2010/134450 Inventors: E. Aoki, T. Yamane and Y. Inoue Publication date: 25 November 2010
Pipe joint
This pipe joint, which is intended for use in refrigeration systems, helps avoid corrosion if dissimilar metals are used. Patent WO/2010/134557 has further details.
14
Sealing Technology
Applicant: Higashio Mech Co Ltd, Japan A pipe joint that is suitable for use, particularly for refrigerant piping, is described. According to the patent, it does not cause corrosion when it comes into contact with different kinds of metal. The design improves the efficiency of
April 2011
Seal system for gear pumps A retractable mechanical seal has been developed which uses a centrifugal actuator (20) to push together the faces during shaft rotation. Patent WO/2010/130969 has further details.
Patent number: WO/2010/129189 Inventors: E.S. Czechowski, P. Leising and N.P. Vetter Publication date: 11 November 2010 Technical Editor’s comment: I think the point of this patent is that it is used in a relatively low-cost application where only a single, dry gas seal may be used.
Flat seal composed of a sealing bead and embossing Applicant: Federal-Mogul Sealing Systems GmbH, Germany A method of embossing the layers of a multi-layered steel head-gasket is covered by this patent. The embossing can provide detents and studs, which are used to locate the layers relative to each other. Patent number: WO/2010/130469 Inventor: K. Schmitt Publication date: 18 November 2010
Mechanical seal assembly Applicant: John Crane UK Ltd, UK A mechanical seal assembly has been developed in which the seal faces are designed to separate when shaft rotation stops and sealing engagement is re-established when the machine is started. The stationary seal ring (50) has limited axial movement. The rotating seal ring (30) has an external secondary seal on an inclined plane. This encourages retraction of the seal face. What is described as a centrifugal actuator (20) pressurises the rotary face into engagement when the machine is started. A range of potential pumping features for the centrifugal actuator are also described. Patent number: WO/2010/130969 Inventors: N.D. Quarmby and K. Klintenstedt Publication date: 11 November 2010
Applicant: Illinois Tool Works Inc, USA This invention relates to sealing systems for gear pumps used to convey a (coating) material in a coating operation. A dual-seal system, using springenergised U-rings is described. A flushing medium is fed into the inter-seal space to flush the coating material away from the seals. The design of the seals used to facilitate flushing is described. Some alternative arrangements are also illustrated. Patent number: WO/2010/132154 Inventors: J.F. Schaupp and M.J. Selmek Publication date: 11 November 2010
Water seal plug and connector Applicants: Yazaki Corp and NOK Corp – Japan The purpose of this invention is to provide an improved watertight connection for a cable that is entering a terminal box, and also reduce the insertion effort required when fitting this cable through the seal. The seal has a coaxial construction with inner and outer portions of elastomer set around a plastic sleeve. The lips on the elastomer seal are designed to optimise fitting and sealing performance. Patent number: WO/2010/134450 Inventors: E. Aoki, T. Yamane and Y. Inoue Publication date: 25 November 2010
Pipe joint
This pipe joint, which is intended for use in refrigeration systems, helps avoid corrosion if dissimilar metals are used. Patent WO/2010/134557 has further details.
14
Sealing Technology
Applicant: Higashio Mech Co Ltd, Japan A pipe joint that is suitable for use, particularly for refrigerant piping, is described. According to the patent, it does not cause corrosion when it comes into contact with different kinds of metal. The design improves the efficiency of
April 2011