SU792014A1 - Labirinth pack - Google Patents

Description

(54) LABYRINTH SEAL

one

The invention is related to the field of gas and air construction, in particular, to the construction of labyrinth assemblies of rotating parts.

A well-known sphering seal has a comb located on a rotating part and a coating W of a backing applied against them on the wall of the housing.

The disadvantage of such a seal is that it penetrates the scallop into the coating while reducing the radial gap in the machine’s operation process occurs along the entire circumference of the crest, which can lead to swelling of the scallops and, 5 coatings from their mutual friction and sticking coatings on iggl scallops, in the application of durable and hard coatings, strong wear of scallops. The removal of the scallops leads to a decrease in the efficiency of the labyrinth seal and the adhesion of the coating to the scallops leads to a complete release of the seal from the system and, often, with the seizure of the rotor of the machine.

The aim of the invention is to improve the reliability of the seal by preventing sticking and covering and wear of the scallops by eliminating the strong friction of the outer and side surfaces of the scallops when they are embedded in the cover during operation of the turbomachine with minimal radial clearances in the seal.

This goal is achieved by the fact that one or more transverse cuts are made on the scallops around the circumference, forming a cutting edge on the scallops, which protrudes both along the diameter, TEIK and behind (side surfaces of the scallop.

FIG. 1 shows the proposed seal, a general view of FIG. 2 - view

along arrow A in FIG. 1, in FIG. 3 - element 1 in FIG. 2; in fig. 4 is a view along arrow B in FIG. 3

The labyrinth seal consists of scallops 1, made on a rotating part 2, and a wall of the body 3 with a special coating 4 that allows the comb to touch.

Along the circumference of the scallops, one Hmi has several transverse sections 5. In the places of the cuts, the scallops have a cutting edge 6, which protrudes beyond the contours of the scallops both in diameter and in lateral ps surfaces.

It is advisable that the vegetatum cut out the edges of the edges for the lateral surfaces of a shoulder of 0.02-0.2 mm, and in diameter of 0.9-0.2 mm to 0.1 mm. Depth of cut K (0.3 - O, b) H, where H is the height of the scallop, R (0.5 1, O) I, o1 60 - 90.

The mounting radial clearance between the cutting edge on the outer surface of the scallop and the coating is chosen to be minimal and may be equal to O.

In the process of machine operation, the difference between thermal expansions, deformations of parts, backlashes into the rotor support, etc., is caused by the penetration of the edges of the scallops into the floor.

Thanks to the cutting edge vytupaniya for the contour of the scallops, cut them

the annular groove is wider than the scallop, which means that the third groove is about its third, both outer and ii side surfaces i; prevents scallop wear and coating sticking.

Claims (1)

Invention Formula A labyrinth seal containing a coating located on the rotating parts of the comb and applied against them on the wall of the case is one that, in order to increase reliability by eliminating the covering of the side and outer surfaces of the scallops, iia after the circumference, at least one transverse notch is made in the sea, forming a sharp edge along the height of the scallop, protruding beyond the side surfaces and the scallop, Informans sources (ash, taken into account during the examination i, 1 ;;: Kitin Yu. M. Designing elements of parts and assemblies of aircraft engines M., Mashinostroesh, 1968, p. 179 (prototype). Rotation direction 6