Mechanical seals incorporating a pu...  

Mechanical seals incorporating a pusher ring for safe

Mechanical seals incorporating a pusher ring for safe

An improved mechanical seal incorporating a pusher ring to hold the integral parts of the seal together, in lieu of a typical retaining ring and snap ring aligning and compressing the gland plate. The improvement consists of a pusher ring, fixedly attached to the seal body gland face with cap screws, which retains the gland plate, allowing for easy and safe repair and assembling.
A mechanical seal provides a hydraulic seal between a rotatable element, typically, a shaft and a stationary housing of the apparatus. Such seals are associated with a fluid pump having a shaft extending through a pump housing wall, handling fluids of varying viscosity. The lower the viscosity of the fluid being handled, the tighter the seal required within the pump design.
Although these seals are most commonly employed on pump equipment, other fluid handling equipment also utilize Mechanical seals. So, although the present invention is addressed in terms of pump applications, the invention is not restricted therein, but may be employed on all such equipment having mechanical seals.
The pump shaft is typically coupled to a motor through a motor shaft. The mechanical seal forms a seal between the pump shaft and the outer surface of the pump housing. Mechanical seals for such applications are commercially available and have been available for more than 25 years.
Seals, Generally

Seals, within their most standard and most essential form, are recognised inside the artwork and comprise rotatable components and stationary components which make contact with to type a seal at opposing sealing surfaces. The rotatable components consist of the shaft attachment means. this type of the suggests is generally a sleeve possessing an inside perimeter surface area which sealingly fits much more compared to external perimeter surface area belonging in the direction of shaft and is also attached in the direction of shaft, by connecting suggests along the lines of arranged screws. An "O" ring usually provides a seal among the shaft as well as the sleeve. There may be considered a rotatable circumferential seal element interconnected in the direction of sleeve so concerning rotate once the shaft and sleeve rotate. The sleeve extends axially along the shaft.

The stationary components comprise a gland which extends circumferentially near to the shaft. The gland abuts in opposition to the external real estate surface area near to the shaft. There is generally a sealing gasket interconnected in the direction of gland and situated among the gland as well as the housing. The gland features getting a bottom by which the seal is attached in the direction of housing. The link is generally achieved by bolts extending through the external real estate wall. The bolts pass through slots or connecting extensions extending radially through the gland through the connecting slots or connecting extensions and secured with nuts. A stationary seal element is situated among the inside circumferential surface area belonging in the direction of gland facing the shaft (i.e. the gland inside surface) as well as the shaft. The stationary seal is straight or indirectly attached in the direction of stationary gland. There are ideal suggests along the lines of described in U.S. Pat. Nos. 4,832,351 and 4,989,882 to axially center the several stationary components concerning the shaft. A circumferential spacing is maintained among the stationary elements, as well as the shaft and several belonging in the direction of rotating elements.

Mechanical Seals, Specifically

The mechanised seal also comprises rotatable components and stationary components. The rotatable components are interconnected in the direction of shaft and rotate using the shaft. The stationary components are interconnected in the direction of real estate and do not rotate. The rotatable components and stationary components are positioned relative to every other to ensure that the rotatable seal surface area sealingly engages a stationary seal surface. this type of the mechanised seal is especially very helpful to type seals on units which have rotatable shafts extending therefrom and fluid within along the lines of fluid pumps, i.e., consuming water pumps, which have near tolerances, especially in products requiring the managing of caustic substance ingredients or flammable liquids. They are also extensively employed in nuclear reactor cooling products to incorporate radioactive liquids. standard mechanised seals are produced for leakage of much under one one-thousandth of one % belonging in the direction of quantity belonging in the direction of fluid pumped, every system time.

The preceding artwork mechanised seals day back again in the direction of earlier 1980's. They have existed for several years, as relative to this art. There has existed, however, safety concerns much more than a amount belonging in the direction of seals because they ordinarily utilize snap rings concerning the seal which, in spite of the reality that getting build or removed, can develop to be projectiles which pose a danger in the direction of mechanics.

Original styles employed a heavy duty snap ring just inside the gland to sustain the integral components belonging in the direction of seal together. This snap ring was rated at upwards of 80,000 ft. lbs. of axial thrust load. this could be considered a good offer more axial thrust fill than any pump would actually know-how with these seals, and was severe for just about any snap ring as accustomed to these seals. Therefore, once the snap ring was removed, special pliers experienced getting employed, and danger of serious injury was feasible because belonging in the direction of loaded spring major to the danger of projectiles.

Mechanical seals recognised inside the artwork have no much under one "O" ring associated to the sealing element getting acted on, and in most instances, acted on with the spring. The spring forces this element toward the opposing element to type a seal. The "O" ring should type a seal not withstanding the axial movements and is also recognised getting a "dynamic-O" ring. Additionally, the energetic "O" ring is situated in an "O" ring slot which could clog. The spring must, therefore, provide force to trigger the sealing components to can be found collectively below enough stress to type a seal in spite of the reality that overcoming the resistance belonging in the direction of dynamic-O ring.

It can be desirable to eradicate the metal spring build in concert using the energetic "O" ring, and that may be the present impression belonging in the direction of creation disclosed and claimed herein. the present creation retains all the favorable features belonging in the direction of "O" ring, but with out the drawbacks of snap ring and retaining rings, the mechanisms which produce the harmful tendency belonging in the direction of spring mechanisms in current art.

Additionally, the suggests to connect the mechanised seal in the direction of real estate is integrated in to the framework belonging in the direction of stationary components. The mechanised seal is ordinarily arranged in place and eliminated inside the small space among the pump and motor. The suggests to attach the seal requires up space and make entry in the direction of mechanised seal complicated for the two set up and removal. A layout with much less difficult entry in the direction of seal components in the place in which the shaft extends through the real estate is desirable, also an attribute belonging in the direction of current invention.