Pressure equalizing device and deep well motor/pump combination
US4425087A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 27, 1981 |
| Grant date | Jan 10, 1984 |
| Priority date | — |
| Expiry date | Nov 27, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/164
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a fluid-filled electric motor having a throughgoing shaft the requirements (i) internal fluid pressure maintained above ambient during installation (ii) equalization of internal and ambient pressures at run-up (iii) no solid particles contaminate internal fluid are met by a pressurizing apparatus in which internal motor pressure above ambient moves a piston against a spring. The pressure ensures integrity of a seal and pressure and temperature variations are accommodated by piston movement. The seal runs clear of the motor shaft allowing equalization of internal and ambient pressures during run up to speed. Only liquid can enter the spring chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.