CN2828324Y

CN2828324Y - Labyrinth gland sealing

Info

Publication number: CN2828324Y
Application number: CN 200520035880
Authority: CN
Inventors: 江生科; 孙奇; 孔祥林
Original assignee: DONGFANG STEAM TURBINE PLANT
Current assignee: DEC Dongfang Turbine Co Ltd
Priority date: 2005-10-26
Filing date: 2005-10-26
Publication date: 2006-10-18
Anticipated expiration: 2015-10-26

Abstract

The utility model provides a novel labyrinth gland seal in a shape like a Chinese character 'tian', which comprises a gland seal ring and gland seal teeth on the gland seal ring, namely, an adaptive gland seal sheet are inlaid in an axial groove arranged in the circumference direction of the gland ring, and is riveted, sealed and fixed. The utility model has the effect that due to adopting the structure, the circumferential gland seal sheet of the gland seal ring effectively blocks the circumferential current of steam flow, so that the steam flow forms strong spiral vortexes in a gland seal chamber so as to increase the turbulence intensity and the friction effect of the steam flow, so that the steam turbulence energy in the gland seal chamber can be thoroughly converted into heat energy so as to enhance sealing effect. The utility model can effectively stop steam being leaked toward a bearing box and destroying oil quality, can avoid annular steam flow vibration, improve rotor running stability, suppress rotor low frequency vibration and raise unit safety. Tests show that a circle of gland seal can raise sealing efficiency by more than 13%, save energy and lower unit operating cost.

Description

Novel sphere of movements for the elephants type labyrinth gland

Technical field

The utility model relates to the improvement of turbine body field, gland seal structure, and novel specifically sphere of movements for the elephants type labyrinth gland structure is applicable to the shaft end gland seal and the diaphragm gland of all types of steam turbine.

Background technique

Known to the research of claimant's professional production: packing is to be used for limiting the necessary parts that the high pressure gas leaks in large rotating machinery, and the rationality of gland seal structure design directly influences the efficient and the Security of unit.Traditional packing commonly used is because there is following shortcoming in reasons in structure: sealing effect is not good, and energy loss is serious; The bearing housing inside admission is serious, makes oil mixed with water, destroys oil, and the corrosion of adjusting portion cover influences unit safety; Low pressure (LP) cylinder is poorly sealed, causes in the air to leak, and reduces low pressure (LP) cylinder and condenser vacuum; The steam flow flowing instability of seal leakage brings out the rotor low-frequency vibration easily, causes the rotor unstability.

Summary of the invention

The purpose of this utility model is to solve the above-mentioned shortcoming that traditional packing exists, and improves the sealing effect of shaft end gland seal and diaphragm gland, eliminates the potential safety hazard of unit, improves unit efficiency, makes out a kind of novel sphere of movements for the elephants type labyrinth gland.

The purpose of this utility model is to adopt following technical solution to be achieved: comprise labyrinth ring and on gland sealing gear, promptly in each axial groove that labyrinth ring circumferentially has, all inlay adaptive packing thin slice and rivet sealing and fixing.

Described each axial groove is " recessed " type groove, all inlays " | " type packing thin slice.

Described each axial groove is the T-shape groove, all inlays T-shape packing thin slice.

Described each axial groove is " L " type groove, all inlays " L " type packing thin slice.

Described each axial groove is " V " type groove, all inlays " V " type packing thin slice.

Useful positive technique effect of the present utility model is: owing to adopt said structure, the circumferential packing thin slice of labyrinth ring has effectively hindered the circumferential flow of steam flow, steam flow has formed strong spiral whirlpool in the packing chamber, the turbulence intensity and the frictional resistance effect of the steam flow that increases, make the eddy kinetic energy of gas in the packing chamber be converted into heat energy more completely, thereby reach the purpose that improves sealing effect.The utility model can effectively stop steam to bearing housing internal leakage, destruction oil, can avoid the vibration of hoop steam flow, improves the stability of rotor operation, suppresses the low-frequency vibration of rotor, improves the Security of unit.Installation and Debugging of the present utility model are identical with traditional approach, and are simple and need not anyly train.In a word, key of the present utility model is: solved the technical barriers such as potential safety hazard of the big and unit of traditional seal leakage amount, the efficient and the Security that have improved steam turbine set.Adopt this packing through test, a circle packing can improve leakage efficiency more than 13%, saves a large amount of energy, reduces the operating cost of unit.

Description of drawings

Fig. 1 is the structural representation of traditional packing.

Fig. 2 is a structural representation of the present utility model.

Fig. 3 is the partial structurtes enlarged diagram of Fig. 2.

Fig. 4 is that the circumferential axial groove of labyrinth ring is " recessed " type groove and corresponding packing thin slice schematic representation among Fig. 2.

Fig. 5 is that the circumferential axial groove of labyrinth ring is T-shape groove and corresponding packing thin slice schematic representation among Fig. 2.

Fig. 6 is that the circumferential axial groove of labyrinth ring is " L " type groove and corresponding packing thin slice schematic representation among Fig. 2.

Fig. 7 is that the circumferential axial groove of labyrinth ring is " V " type groove and corresponding packing thin slice schematic representation among Fig. 2.

Embodiment

Embodiment one: with reference to Fig. 2, Fig. 3, Fig. 4, when adopting the utility model, the processing technology of steam seal ring is the same substantially with traditional approach, unique difference is after the packing segmental arc processes, circumferentially mill out the axial notch of some and size along packing, more circumferential labyrinth strip is inlayed into groove and the riveting jail gets final product.Promptly comprise labyrinth ring and on gland sealing gear 1, in each axial groove that labyrinth ring circumferentially has, all inlay adaptive packing thin slice 2 and rivet welding and sealing and fix.Circumferentially have 150 axial " recessed " type grooves 3 at labyrinth ring specifically, axially all inlay corresponding " | " type packing thin slice 2 in " recessed " type groove 3 at each.

Embodiment two: with reference to Fig. 2, Fig. 3, Fig. 5, circumferentially have 150 axial T-shape grooves 3 at labyrinth ring, all inlay corresponding T-shape packing thin slice 2 in each axial T-shape groove 3.

Embodiment three: with reference to Fig. 2, Fig. 3, Fig. 6, circumferentially have 150 axial " L " type grooves 3 at labyrinth ring, axially all inlay corresponding " L " type packing thin slice 2 in " L " type groove 3 at each.

Embodiment four: with reference to Fig. 2, Fig. 3, Fig. 7, circumferentially have 150 axial " V " type grooves 3 at labyrinth ring, axially all inlay corresponding " V " type packing thin slice 2 in " V " type groove 3 at each.

Claims

1. novel sphere of movements for the elephants type labyrinth gland, comprise labyrinth ring and on gland sealing gear, it is characterized in that: in each axial groove that labyrinth ring circumferentially has, inlay adaptive packing thin slice and rivet sealing and fixing.

2. novel sphere of movements for the elephants type labyrinth gland according to claim 1, it is characterized in that: each axial groove is " recessed " type groove, inlays " | " type packing thin slice.

3. novel sphere of movements for the elephants type labyrinth gland according to claim 1, it is characterized in that: each axial groove is the T-shape groove, inlays T-shape packing thin slice.

4. novel sphere of movements for the elephants type labyrinth gland according to claim 1, it is characterized in that: each axial groove is " L " type groove, inlays " L " type packing thin slice.

5. novel sphere of movements for the elephants type labyrinth gland according to claim 1, it is characterized in that: each axial groove is " V " type groove, inlays " V " type packing thin slice.