SU1513157A1 - Labirinth packing for turbomachine - Google Patents

Abstract

This invention relates to a power system. The aim of the invention is to increase reliability and efficiency. Alternating short 5 and long 6 chokes ridges of segments 2 are located opposite alternating protrusions 8 and valleys 9 on the rotor (P) 7 with radial clearances δ ₀ and δ ₁ . The radial clearances δ ₀ and δ _{1 are} made of different sizes, and their size is chosen based on the dependence 2δ ₀ ≤δ ₁ * 98H, where H is the depth of the depressions 9. On the protrusions 8, the edges 10 are made of multiple inclined knurling to twist the working fluid leakage. This embodiment of the gaps reduces and stabilizes leaks compared with the implementation of gaps equal to the value, excluding grazing ridges 5 and 6 about R 7 and also eliminates the development of thermal deflection R 7. 2 Il.

Description

SP

with

SP

The invention relates to a power system and can be used in turbo-engines, mainly in steam turbines.

since it can only be caught on short crests 5. In this case, the annular projections 8 have the freedom of thermal axial expansions and the deflection develops

The aim of the invention is to increase fundamentally can not. Consequently,

reliability and efficiency.

FIG. 1 shows a labyrinth seal of a turbomachine, general, its appearance; in fig. 2 is a section A-A in FIG. one.

it is possible to refuse to perform temperature compensation grooves (not shown) on the rotor 7 and to increase the thermal strength of the rotor 7, the reliability and maneuverability of the turbomachine. At the same time, the labyrinth seal consists of the leaking of the working fluid through the seal along

torus 1, in which split spring-loaded segments 2 are installed, pressed by flat springs 3 to the T-shaped groove 4 of stator I. Segments 2 are fixed alternately, and there are short and long throttles 5 and 6. On the rotor 7 alternating seams are made in cross section, annular protrusions 8 and depressions 9 of depth / g, forming radial gaps 6 and 6i with short and long choke ridges 5 and 6, respectively. The throttle ridges 5 and 6 are located opposite the projections 8 and depressions 9, respectively. On the protrusions 8, an arrangement is made for twisting the leakage of the working fluid in the form of ribs 10 of a multiple-starting oblique knurling. Multiple knurling can have the following geometrical parameters:, angle | 80-90 °, (. Radial clearances ("and (Si) are made of different sizes and their values are selected, based on

.

By installing radial clearances 6 „and 6; in compaction with different sizes under short and long ridges 5 and b, the development of the thermal deflection of the rotor 7 can be avoided,

15

20

Compared with equal gaps b ,, and the magnitude of which excludes grazing.

Claims (1)

Invention Formula A labyrinth seal of a turbomachine containing split spring-loaded segments, alternating short and long throttles of which are arranged with a radial clearance against respectively alternating annular protrusions and rotor cavities, and on the projections there is a device for twisting the working fluid leaking, characterized in that efficiency, 25 device for twisting made in the form of edges of multiple skew knurling, and the radial clearances are different in size and their values are chosen starting d of the following dependencies: 302b „B1 / g, where bn and 6i are the values of the radial gaps between short ridges and protrusions and between long ridges and depressions; 35 / g - the depth of the depressions. since it can only be caught on short crests 5. In this case, the annular projections 8 have the freedom of thermal axial expansions and the deflection develops fundamentally can not. Consequently, 15 20 Compared with equal gaps b ,, and the magnitude of which excludes grazing. Invention Formula A labyrinth seal of a turbomachine containing split spring-loaded segments, alternating short and long throttles of which are arranged with a radial clearance against respectively alternating annular protrusions and rotor cavities, and on the projections there is a device for twisting the working fluid leaking, characterized in that efficiency, 25 device for twisting made in the form of edges of multiple skew knurling, and the radial clearances are different in size and their values are chosen starting d of the following dependencies: 302b „B1 / g, where bn and 6i are the values of the radial gaps between short ridges and protrusions and between long ridges and depressions; 35 / g - the depth of the depressions.