Mechanical seal with bellows seating alignment
A mechanical seal having a stationary ring and a rotating portion. The rotating portion includes a runner adjacent the stationary ring, an elastomer bellows adjacent the runner, a spring retainer plate and a spacer positioned between the elastomer bellows and the spring retainer plate. The spacer sets and maintains the elastomer bellows in proper position adjacent the runner.
Submersible pumping systems are often deployed into wells to recover petroleum fluids from subterranean reservoirs. Typically, the submersible pumping system includes a number of components, including one or more fluid filled electric motorscoupled to one or more high performance pumps. Other components commonly used include seal sections and gearboxes. Each of the components and sub-components in a submersible pumping system must be engineered to withstand the inhospitable downholeenvironment, which includes wide ranges of temperature, pressure and corrosive well fluids.
For prolonged operation in the downhole environment, it is necessary to seal various internal components of the pumping system from corrosive well fluids and debris. Although there are a variety of components within the pumping system that aresusceptible to unwanted fluid migration, moving parts, such as rotating shafts, are particularly difficult to seal. To prevent fluid leaks around rotating shafts, designers often employ mechanical seals that fit around the outer circumference of acylindrical shaft.
As shown in FIG. 1, Prior Art mechanical seal designs may include elastomer bellows 10, a coiled spring 12, a runner 14 and a stationary ring 16. These components cooperate to prevent the migration of fluid along a centralized shaft 18. Thestationary ring 16 has an internal diameter sized to permit the free rotation the shaft 18. In contrast, the elastomer bellows 10, springs 12 and runner 14 rotate with the shaft 18. The rotating runner 14 is held in place against the stationary face 16by the spring-loaded rubber bellows 10. The bellows 10 has a fold that allows its length to adjust to keep the runner 14 in contact with the stationary face 16 if the shaft should experience axial displacement.
Limitations in presently available designs, however, can result in failures in the mechanical seal that allow well fluids to penetrate undesirable locations and to require costly repairs. After prolonged exposure to repetitive axial movement,the elastomer bellows 10 may slip from its intended position, thereby compromising the ability of the runner 14 to create a positive seal against the stationary face 16. It is to these and other deficiencies and requirements in the prior art that thepresent invention is directed.
Although the preferred embodiment has been demonstrated for use within a seal, it will be understood that application of the invention can be within any component that employs a rotating shaft wherein the prevention of fluid flow isdesired. Among the possible applications include but are not limited to motors, pumps and gearboxes. It is to be understood that even though numerous characteristics and advantages of various embodiments of the present invention have been set forth inthe foregoing description, together with details of the structure and functions of various embodiments of the invention, this disclosure is illustrative only, and changes may be made in detail, especially in matters of structure and arrangement of partswithin the principles of the present invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. It will be appreciated by those skilled in the art that the teachings of the presentinvention can be applied to other systems without departing from the scope and spirit of the present invention.
In a preferred embodiment, the present invention includes a mechanical seal having a stationary ring and a rotating portion. The rotating portion includes a runner adjacent the stationary ring, an elastomer bellows adjacent the runner, a springretainer plate and a spacer positioned between the elastomer bellows and the spring retainer plate. The spacer maintains the elastomer bellows in proper position adjacent the runner.
About the Author
Ningbo Yinzhou Guowei, mechanical seal Component Factory is a professional engaged in the design, development, manufacture, sale of various cartridge seal and flygt seals business. Production and testing are well-equipped with a high-quality staff.
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