SE458295B - COMBINED SEALING AND INNER COATING FOR THE INNER END OF A LINE OF COMPRESSOR LEADERS WITH A ROTATING MACHINE - Google Patents

Description

458 295 10 15 20 25 30 35 2 stator vanes 10, of which only one is shown, but extends inwards from the housing or the outer casing and is arranged between the rows of blades. The outer ends of the vanes can be brazed to the outer jacket for secure attachment to it.

The inner end of each vane has a tongue 12 which extends inwardly through an opening 11 in the inner jacket 16. These tongues are preferably brazed to the inner jacket. The inner jacket is arranged in the form of a trough with side walls 18 or fl extending inwards from the construction as shown. The inwardly facing trough is filled with any abrasive sealing material, which may be any of a variety of materials, such as rubber, nickel aluminide polyester, nickel graphite or nickel chromium polyester and which, independently of the material used, may be injected into the trough to the desired depth. This arrangement routinely allows a greater depth of sealing material than in the conventional construction, and the fins on the rotor form suitable sealing grooves in the wearable material when the engine is operating.

Since the sealing ring or trough forms an integral part of the inner jacket, it is obvious that the sealing material in the trough can have substantially the diameter of the jacket and thus allow the seal to be closer to the gas path and cause the least possible disturbance of the compressor gas path flow.

The blades have inner sheaths substantially arranged in line with the inner sheaths to define the inner wall of the gas path through the compressor.

The weight loss is also significant, as the seal and jacket form a single simple ring construction.

Obviously, the reduction in parts and weight results in a significant cost reduction.

Maintenance costs will be significantly lower, as the abrasive material can be replaced at a repair facility if needed and the material can be easily removed, if desired, by sandblasting. This is especially desirable when access to any tongue is required such as for blade replacement. The abrasive material can be sandblasted away on the selected surface next to the tongue. The depth and width of the trough or gutter can be varied as desired and very effective sealing is the result of allowing the sealing fins to wear away a part of the material and thereby form grooves in the sealing material which fit snugly to the sealing fins. Although the invention has been shown and described with respect to a preferred embodiment, it is obvious to those skilled in the art that other various changes and omissions as to its design and details may be made without departing from the scope of the invention.

Claims (3)

10 15 20 458 295 3 PATENT REQUIREMENTS Combined sealing and inner jacket ring for the inner ends of a row of compressor articulated vanes of a rotary machine, which extend inwardly towards a axis of rotation, each vane (10) having a tongue (12) at its inner end which adapts the vane (10) to engage a part of the jacket ring (16), said part of the jacket ring (16) having an inner surface and a row of openings (14) extending through the jacket ring (16) to the inner surface, characterized by a brazing material at each vane (10) extending between said part of the jacket ring and the tongue (12) of each vane (10) to braze the tongue (12) in the opening (11l) and form an integrated unit between the vane (10) and the part of the jacket ring (16) attached to the vane (10), and an abrasive sealing material arranged on the inner surface of the jacket ring (16) for sealing engagement with the rotor of the rotary machine, which covers the brazing material and which is substantially the same diameter as the vanes ( l 0) in down ends. Device according to claim 1, characterized in that the abradable material is a sprayable material. Device according to claim 1 or 2, characterized in that the abrasive sealing material is nickel-chromium polyester.