CN201908693U - Honeycomb-shaped steam seal - Google Patents

Abstract

The utility model discloses a honeycomb-shaped steam seal, which comprises a steam seal parent ring, wherein a groove is arranged at the circumference of the steam seal parent ring; a spring and an inner ring are arranged in the groove; and the spring is fixed on the inner ring through a screw. In the honeycomb-shaped steam seal, by arranging the groove on the honeycomb-shaped steam seal parent ring and arranging the spring and the inner ring in the groove, zero-gap or micro-gap is achieved between the inner ring and the rotor, thereby combining the vortex throttling and the zero-gap or micro-gap throttling of the honeycomb-shaped steam seal, and the sealing effect is more remarkable.

Description

Honeycomb steam seal

Technical field

The utility model relates to a kind of packing, relates in particular to a kind of honeycomb steam seal, belongs to the turbomachinery field of sealing technology.

Background technique

Steam turbine has stator and rotor two large divisions.Rotor high-speed rotation when work, stator is fixed, so must keep certain clearance between rotor and the stator, does not make the phase mutual friction.When vapor stream was crossed each level work of steam turbine, pressure, temperature descended step by step, existed pressure reduction in the dividing plate both sides.When moving vane has degree of reaction, also exist pressure reduction before and after the moving vane.Steam flows through the acting from the passage of stator, movable vane except the overwhelming majority, and sub-fraction can flow through from various gaps and not do work, and becomes a kind of loss, has reduced the efficient of unit.

Rotor also must pass cylinder, is supported on the bearing, also must leave the gap herein.For the front end of high pressure cylinder two ends and intermediate cylinder, the vapor pressure in the cylinder will have steam to spill herein greater than external atmospheric pressure, reduce unit efficiency, and cause the loss of part water of condensation., pass in the gap of cylinder because of the vapor pressure in the cylinder is lower than extraneous atmospheric pressure at the two ends of the exhaust end of intermediate pressure cylinder and low pressure (LP) cylinder, will have air to bleed in the cylinder at main shaft.Because air can not condense, thereby has reduced degree of vacuum, reduced steam acting ability in vapour condenser.

In order to reduce the gas leakage in the above-mentioned gap everywhere, guarantee the normal safe operation of steam turbine again, the spy is provided with various packings.These packings can be divided into flow passage component packing, diaphragm gland and shaft end gland seal three major types.With regard to working principle, this three classes packing all belongs to labyrinth gland.

Shaft end gland seal mostly is the stage teeth packing, all is designed to multi-segment structure, is made up of several packing parent rings 1 for every section, between adjacent two sections steam chest is set, as shown in Figure 1.Gland sealing gear is processing or is embedded on the packing segmental arc that the packing segmental arc is divided formation labyrinth ring in the annular channel that can be inlaid in the labyrinth casing inwall again, and whole packing parent ring is made up of 6 ~ 8 sections packing segmental arcs.The packing segmental arc adopts yielding support, promptly connects a spring sheet with pin on the periphery of each segmental arc, embeds conduit rear spring rear spring sheet the supporting surface of segmental arc and conduit is fitted.Since the labyrinth seal structure of existing vapour (gas) sealing, and have big gap between the rotor, must increase air leakage like this, thereby unit efficiency is reduced.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of honeycomb steam seal, can increase the chamber, labyrinth, with the increase frictional resistance effect, thus the resistance vapour effect of reinforcement gland sealing gear.

The utility model is to solve the problems of the technologies described above the technological scheme that adopts to provide a kind of honeycomb steam seal, comprises packing parent ring, and wherein, described packing parent ring circumferencial direction is provided with groove, is provided with spring and interior ring in the described groove.

Above-mentioned honeycomb steam seal, wherein, described spring by screw on interior ring.

Above-mentioned honeycomb steam seal, wherein, described interior ring material is wear-resisting lubriation material.

The utility model contrast prior art has following beneficial effect: the honeycomb steam seal that the utility model provides, by on honeycomb steam seal parent ring, groove being set, and spring and interior ring be set in groove, can reach zero clearance or microgap between ring and the rotor in making, thereby the throttling of honeycomb steam seal vortex and zero clearance or microgap throttle butterfly are lumped together, and sealing effect is more remarkable.

Description of drawings

Fig. 1 is existing gland seal structure schematic representation;

Fig. 2 is a honeycomb steam seal cutaway view Amplified image of the present utility model.

Among the figure:

1 packing parent ring, 2 grooves, 3 springs

Ring 5 screws 6 rotors in 4

Embodiment

The utility model will be further described below in conjunction with drawings and Examples.

Fig. 2 is a honeycomb steam seal cutaway view Amplified image of the present utility model.

See also Fig. 2, Fig. 2 is the cutaway view Amplified image along A-A line among Fig. 1, the honeycomb steam seal that the utility model provides comprises packing parent ring 1, is processed with groove 2 at the circumferencial direction of honeycomb steam seal parent ring 1, and installs additional and have automatic tracking spring 3 in gap and the good interior ring 4 of self-lubricating property.Because spring force is the supporting effect of ring 4 internally, ring is the good high-abrasive material of self-lubricating property within adding, and can reach zero clearance or microgap between ring and the rotor 6 in making.Spring 3 encircles on 4 in can being fixed on by screw 5.Thereby, the throttling of honeycomb steam seal vortex and zero clearance or microgap throttling are perfectly combined, sealing effect is more remarkable.

Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.

Claims (3)

1. a honeycomb steam seal comprises packing parent ring (3), it is characterized in that, described packing parent ring (3) circumferencial direction is provided with groove (2), is provided with spring (3) and interior ring (4) in the described groove (2).

2. honeycomb steam seal as claimed in claim 1 is characterized in that, described spring (3) is fixed on the interior ring (4) by screw (5).

3. honeycomb steam seal as claimed in claim 1 or 2 is characterized in that, described interior ring (4) material is wear-resisting lubriation material.

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