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Water pump seal and its assembly method
PATENTS
Cylindrical spring with integral dynamic gas seal Applicant: Penn State Research Foundation, USA This invention is specifically intended for thermo-acoustic engines and refrigerators. These typically operate at acoustic frequencies in the range from about 40 Hz to 500 Hz. To operate at these frequencies, the electromechanical transduction device, such as a loudspeaker or linear motor/alternator, requires some supplemental stiffness, such as a spring to allow the moving mass of the electro-mechanical device to resonate at the desired operating frequency. A cylindrical spring design according to the present invention can also act as a dynamic gas seal if the gaps between the elastic spring beams are closed with a second compliant material, such as an elastomer.
Patent number: WO 03/087679 Inventor: S. Garrett Publication date: 23 October 2003
Binary balance seal assembly for cryogenic service Applicant: Control Components Inc, USA This invention relates to a binary balance seal assembly for use in a balanced pressure valve for cryogenic service, in this case below –60°C. The seal assembly comprises a primary seal which is adapted to be retained within the valve housing. The primary seal is deformed into sealing contact with the outer surface of the valve plug when pressure is applied. In
addition, there is a secondary seal which is adapted to be retained within the valve plug itself. The secondary seal is moved into sealing contact when the valve plug is in the closed position, to prevent upstream pressure from causing fluid to leak downstream of the valve plug. The seal materials are virgin PTFE. Patent number: WO 03/089816 Inventor: N.V. Nguyen Publication date: 30 October 2003
The combined spring and seal which can be used as an alternative to a bellows, as described in WO 03/087679.
Pipe threaded joint for the oil & gas industry Applicant: SC Petrotub SA, Romania The purpose of this invention is to provide an improve threaded pipe joint for the oil and gas industry. This is achieved by the contact between pin and coupling on the bottom diameter of the pin thread and the peak diameter of the coupling
thread. The thread has an asymmetric trapezoidal shape. The threaded joint is claimed to withstand 100% of the axial load rating of the pipe, and the thread form is claimed to be particularly resistant to corrosion. Patent number: WO 03/089754 Inventors: G. Mircea et al. Publication date: 30 October 2003
The sealing system for a cryogenic valve described in WO 03/089816, showing the primary seal in the valve body and the secondary seal that is activated when the plug is closed.
Unitized low-torque labyrinth seal assembly An improved oil pipe thread joint, as claimed by WO 03/089754.
Water pump seal and its assembly method Applicant: NSK Ltd, Japan This patent describes an assembly method for a water pump which will allow the seal lip (23) to come into sealing contact with the outer surface of a slinger (14a). The seal lips (22) and (23) are protected by the slinger (14a) during assembly onto a shaft. Patent number: WO 03/091573 Inventor: M. Ketani Publication date: 6 November 2003 14
Seal assembly showing the orientation of the secondary lip, from WO 03/091573.
Applicant: Stemco LLC, USA A unitized seal assembly for use with roller or ball bearing assemblies is disclosed. An outer radial ring includes a first shield element which defines the first sealing face. The inner deflector ring includes a second shield element which defines a second sealing face. This second sealing face is dimensioned and configured to correspond to the first sealing face, such that a circuitous sealing labyrinth is formed between the two sealing faces. A highly viscous fluid such as water-insoluble grease may be used. The seal also includes a semi-permeable membrane as a ventilation mechanism.
Patent number: WO 03/091607 Inventors: C.R. Hood, D.G. Wells and M.N. Gold Publication date: 6 November 2003
The labyrinth seal arrangement described in WO 03/091607.
Sealing Technology February 2004
Cylindrical spring with integral dynamic gas seal Applicant: Penn State Research Foundation, USA This invention is specifically intended for thermo-acoustic engines and refrigerators. These typically operate at acoustic frequencies in the range from about 40 Hz to 500 Hz. To operate at these frequencies, the electromechanical transduction device, such as a loudspeaker or linear motor/alternator, requires some supplemental stiffness, such as a spring to allow the moving mass of the electro-mechanical device to resonate at the desired operating frequency. A cylindrical spring design according to the present invention can also act as a dynamic gas seal if the gaps between the elastic spring beams are closed with a second compliant material, such as an elastomer.
Patent number: WO 03/087679 Inventor: S. Garrett Publication date: 23 October 2003
Binary balance seal assembly for cryogenic service Applicant: Control Components Inc, USA This invention relates to a binary balance seal assembly for use in a balanced pressure valve for cryogenic service, in this case below –60°C. The seal assembly comprises a primary seal which is adapted to be retained within the valve housing. The primary seal is deformed into sealing contact with the outer surface of the valve plug when pressure is applied. In
addition, there is a secondary seal which is adapted to be retained within the valve plug itself. The secondary seal is moved into sealing contact when the valve plug is in the closed position, to prevent upstream pressure from causing fluid to leak downstream of the valve plug. The seal materials are virgin PTFE. Patent number: WO 03/089816 Inventor: N.V. Nguyen Publication date: 30 October 2003
The combined spring and seal which can be used as an alternative to a bellows, as described in WO 03/087679.
Pipe threaded joint for the oil & gas industry Applicant: SC Petrotub SA, Romania The purpose of this invention is to provide an improve threaded pipe joint for the oil and gas industry. This is achieved by the contact between pin and coupling on the bottom diameter of the pin thread and the peak diameter of the coupling
thread. The thread has an asymmetric trapezoidal shape. The threaded joint is claimed to withstand 100% of the axial load rating of the pipe, and the thread form is claimed to be particularly resistant to corrosion. Patent number: WO 03/089754 Inventors: G. Mircea et al. Publication date: 30 October 2003
The sealing system for a cryogenic valve described in WO 03/089816, showing the primary seal in the valve body and the secondary seal that is activated when the plug is closed.
Unitized low-torque labyrinth seal assembly An improved oil pipe thread joint, as claimed by WO 03/089754.
Water pump seal and its assembly method Applicant: NSK Ltd, Japan This patent describes an assembly method for a water pump which will allow the seal lip (23) to come into sealing contact with the outer surface of a slinger (14a). The seal lips (22) and (23) are protected by the slinger (14a) during assembly onto a shaft. Patent number: WO 03/091573 Inventor: M. Ketani Publication date: 6 November 2003 14
Seal assembly showing the orientation of the secondary lip, from WO 03/091573.
Applicant: Stemco LLC, USA A unitized seal assembly for use with roller or ball bearing assemblies is disclosed. An outer radial ring includes a first shield element which defines the first sealing face. The inner deflector ring includes a second shield element which defines a second sealing face. This second sealing face is dimensioned and configured to correspond to the first sealing face, such that a circuitous sealing labyrinth is formed between the two sealing faces. A highly viscous fluid such as water-insoluble grease may be used. The seal also includes a semi-permeable membrane as a ventilation mechanism.
Patent number: WO 03/091607 Inventors: C.R. Hood, D.G. Wells and M.N. Gold Publication date: 6 November 2003
The labyrinth seal arrangement described in WO 03/091607.
Sealing Technology February 2004