A serial of axial notches made in the rotary sleeve of the seal, extending below the stationary seal assembly further increases pumping efficiency, and may be exploited to circulate barrier fluid without the notches in the flange. A break in the rim at the outlet opening may used to promote increase circulation efficiency. Mechanical seals are exploited to furnish a seal between various components on a rotating shaft. Such seals take many different forms. In the area of cartridge mounted seals are mechanical seals which take at least one set of contacting seal faces, one rotary face and one stationary face, the circular face being determined by its association to a sleeve which is mounted nonrotatably to the shaft. The entire cartridge seal unit is installed by simply sliding the arm and the attached seal components onto the quill and altering the arm in place (usually with set screws). A gland plate is provided for encouraging the stationary seal face. The gland plate is usually bolted to the housing (such as a pump housing) through which the shaft extends. If two sets of seal faces are provided on either face of the gland plate, the varnish is known as a double or tandem seal. In doubled or tandem seals, and in some specialized applications of single cartridge mounted seals, a barrier fluid is circulated through the seal during operation. Barrier fluid, such as a water-ethylene glycol mix, enters and exits through the gland plate. The fluid circulating within the seal provides lubrication for the sealing faces as good as coolant for the seal. The barrier fluid also can help absorb vapor leakage of process fluids, protecting the environment. In a double seal the force is greater in the seal than in the process stream. In a tandem seal the force of the process stream is greater than in the seal. Various devices have been designed to use the revolution of the beam to have a pumping action from inside the seal to spread the barrier fluid. In some mechanical seals an impeller has been added to the internal design of the seal for circulation of barrier fluid. The accession of an impeller is not possible in many cartridge designs as it results in too much mass in the seal, increasing the overall size of the stamp and prohibiting installation of the twist in many applications requiring very small seal components. Both of the patented devices described above have also exhibited a special power to adequately circulate the barrier fluid. There is an increased concern by those in the mechanical seal industry in circulating barrier fluid at a greater flow rate to all internal seal components, thus making the seals use more expeditiously and for a longer period of time. Accordingly, it is an aim of this conception to render a mechanical seal with a barrier fluid circulation system which utilizes the kinetics of the rotating shaft to circulate barrier fluid at a greater flow rate. It is another aim of this conception to render a mechanical seal with a barrier fluid circulation system which more efficiently circulates barrier fluid inside the seal. It is yet another target of this conception to allow a mechanical seal with a barrier fluid circulation system which accomplishes some or all of the above objectives and does not increase overall seal size. Therefore, an improved mechanical seal is provided, wherein an annular inner flange extending from a gland having inlet and outlet openings is provided with a serial of notches between the intake and the exit openings, the notches running in the counsel of gyration of the beam about which the stamp is attached. The annular inner flange extends inwardly toward and close to the shaft. A serial of axial notches made in the rotary sleeve of the seal, extending below the stationary seal assembly further increases pumping efficiency, and may be used to circulate barrier fluid without the notches in the flange. A break in the rim at the outlet opening may used to promote increase circulation efficiency. It is a further objective of this invention to allow a mechanical seal with a barrier fluid circulation system which accomplishes some or all the above objectives while maintaining an annular inner flange on the gland on which seal components can be mounted.
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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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