SU892076A1 - Labirinth packing - Google Patents

Description

(5) LABYRINTH SEAL

one

This invention relates to a sealing technique.

Labyrinth seals are known, comprising a rotor, a housing, a ring consisting of segments, and springs in which the restoration of radial clearances in the seals is carried out by processing shoulders,}}.

Their disadvantage is that it takes a lot of time to repair the turbine.

The purpose of the invention is to reduce these labor costs.

The goal is achieved by the fact that each segment is placed on two eccentric pins that are movable relative to the body.

Figure 1 shows the seal, a longitudinal section; in Figure 2, section A-A in FIG. one .

Labyrinth seal consists of a rotor 1, the body 2 of the ring 3 located in the groove k of the body 2.

The ring 3 is suspended on eccentric pins 5 and is pressed against the spring 6. The ring 3 consists of segments 1, which are made without shoulders; and have holes for the pins 5. The eccentric pin 5 has a head 8 on which a locking protrusion 9 and a slot 10 are made. In case 2, a recess is made under the pin head and in this recess there are several holes 11 located around the circumference, under the protrusions 9.

Seal works as follows.

J5

Initially, the segment is set at a position at which maximum clearance is ensured. When the rotor beats, the waste segments, select the gap b. With frequent contact of the row 20, the ring 3 wears out and the gap increases. To reduce the radial clearance, the pin 5 is rotated. The maximum amount of descent of segment 7 is 22, which will occur at. turning the pin 180.

This makes it possible to reduce the labor costs in restoring the radial clearances in the seal.

Claims (1)

Invention Formula A labyrinth seal consisting of segment ring elements, enclosing a rotating rotor under the action of springs placed between the housing and each of the segment elements, about aphids cha. Each of the segments is placed on two eccentric pins relative to the body, with a simplified slit for adjusting the radial clearances between the segments and the rotor. Sources of information taken into account in the examination T. Bystritsky N.D. Steam turbine diaphragms. Kiev, Maich 3, 1958, p. ., FIG.