CN200975264Y

CN200975264Y - Labyrinth sealing

Info

Publication number: CN200975264Y
Application number: CN 200620027295
Authority: CN
Inventors: 赵岫华; 张振兴; 贺桂林; 姜树海; 何文
Original assignee: 赵岫华
Priority date: 2006-09-12
Filing date: 2006-09-12
Publication date: 2007-11-14
Anticipated expiration: 2016-09-12

Abstract

The utility model relates to a sealing part for the steamer, boiler auxiliary device of the power generator set, in particular to a maze sealing, and is characterized in that: the utility model comprises a cylinder sealing chamber whose inner wall is provided with at least two surrounding grooves, and a sealing ring that is in the grooves and matched with the clearance of the grooves, of which the inner diameter is smaller than that of the inner wall of the cylinder sealing chamber. The utility model has the advantages of changing the prior status that the prior smoke, steam, water as well as the carried impurity is easy to leak through a single direct round clearance of a circular rotator; the smoke, steam, water as well as the carried impurity is respectively through the maze circuitous clearance between the sealing ring and the sealing chamber, the circuitous clearance between the inner walls of the sealing chamber and the sealing ring and the rotator surface, so the utility model can realize the extremely small amount of leakage and good environmental protection effect, reduce the energy consumption and guarantee the device performance.

Description

Labyrinth seal

Technical field

The utility model relates to a kind of thermal power generation unit steam turbine, boiler auxiliaries Sealing, relates in particular to a kind of labyrinth seal.

Background technique

In the thermal power generation field, the supplementary equipment of generator set steam turbine, boiler, as air preheater, steam sootblower, turbine shaft seal, pump etc., many parts that relatively rotate connection are arranged on it, because equipment work is having cigarette, vapour, water and is carrying in the environment of impurity, the environmental pollution that forms for the dust that prevents to cause and noise because of leakage, need be to installing Sealing between the parts connection part in relative rotation, all fixedly installed Sealing as the outer tube of steam sootblower and the joint between the interior pipe and air preheater at shell and motor shaft joint.The general at present Sealing that adopts is made of the packing chamber and the differential of interior sabot root group, owing to form single straight-through annular gaps around the packing group of solid of rotation and differential and solid of rotation ring perimeter surface, therefore, still old cigarette, vapour, water and carry impurity and go out by clearance leakage, both befouling environment, also cause energy waste, and reduce equipment performance.

The model utility content

Main purpose of the present utility model is at the problems referred to above, and a kind of preventing to relatively rotate on it between the parts of connection cigarette, vapour, water and carrying the seal arrangement of escape of impurities of thermal power generation unit steam turbine, boiler auxiliaries that be used for is provided.

The technological scheme that its technical problem that solves the utility model adopts is:

A kind of labyrinth seal is characterized in that being provided with at least in two the ring cylindrical shape closed chambers of all grooves and the groove that crouches and with the seal ring of groove Spielpassung by inwall and forms, and the seal ring internal diameter is slightly less than cylindrical shape closed chamber inner diameter.

There is chamfering on the cell wall top of described groove.

The beneficial effects of the utility model are: owing to adopted labyrinth seal, changed existing thermal power generation unit steam turbine, cigarette on the boiler auxiliaries, vapour, water and carry between the parts of impurity the present situation of leaking easily around the single straight-through annular gaps on solid of rotation surface through relatively rotating connection, but go out through the circuitous clearance leakage of complications that forms between the tortuous circuitous gap of the mazy type that forms between seal ring and closed chamber and closed chamber inwall and seal ring inwall and the solid of rotation surface respectively, because multiple stopping, decompression, leakage rate significantly is suppressed, leakage rate is minimum, reach good environment protection effect, reduce energy consumption and reach energy-conservation purpose, and guarantee equipment performance.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the application schematic representation of the utility model in soot blower;

Fig. 3 is the application schematic representation of the utility model in air preheater.

Below in conjunction with drawings and Examples the utility model is described in detail.

Embodiment

As shown in Figure 1, a kind of labyrinth seal is characterized in that being provided with the cylindrical shape closed chamber 1 of two all grooves 4 of ring at least and being crouched into forming in the groove 4 and with the seal ring 2 of groove Spielpassung by inwall.Be provided with 3 ring all

grooves

4,3 seal rings 2 in the present embodiment and crouch respectively in each groove 4, according to actual needs, groove 4 can be arranged to more, as 5,6,8 etc.Seal ring 2 internal diameters are slightly less than cylindrical shape closed chamber 1 inner diameter, and general difference is 3-9mm.There is chamfering 3 on the cell wall top of described groove 4.The effect of chamfering 3 is to prevent that the groove walls of closed chamber 1 is at high temperature because of dilatancy and the seal ring 2 crowded gaps that can't form the convex-concave complications of closing.Here closed chamber 1 and seal ring 2 can adopt carbon ink alloy or copper material such as brass H96 etc.

Fig. 2 is the application schematic representation of the utility model in soot blower.As seen from Figure 2, labyrinth seal is arranged between interior pipe 6 of soot blower and outer tube 5 joints, and on the pipe 6, its cylindrical shape closed chamber 1 outer wall was embedded in the outer tube 5 in labyrinth seal was sleeved on Spielpassung.High temperature and high pressure steam 7 is pressed in the outer tube 5 through interior pipe 6.Owing to adopt labyrinth seal, steam 7 reaches through the tortuous circuitous gap of the mazy type that is formed by

seal ring

2 and 1 of closed chamber respectively and is gone out by the clearance leakage that forms between closed chamber 1 inwall and seal ring 2 inwalls and interior pipe 6 outer surfaces, again because of seal ring 2 internal diameters are slightly less than cylindrical shape closed chamber 1 inner diameter, so this gap also forms tortuous circuitous gap.Like this, stop, reduce pressure because multichannel is multiple, leakage rate is subjected to effective inhibition, and leakage rate is minimum, high temperature and high pressure steam is leaked cause strong noise to compare, and noise significantly reduces.

Fig. 3 is the application schematic representation of the utility model in air preheater.As seen from the figure, the joint Spielpassung that labyrinth seal is positioned at motor shaft 8 and casing 9 is sleeved on the motor shaft 9, and closed chamber 1 outer wall is welded on the casing 9.Flue gas 10 in the casing 9 reaches through the tortuous circuitous gap of the mazy type that is formed by

seal ring

2 and 1 of closed chamber respectively and is gone out by the clearance leakage that forms between closed chamber 1 inwall and seal ring 2 inwalls and motor shaft 8 surfaces, because of seal ring 2 internal diameters are slightly less than cylindrical shape closed chamber 1 inner diameter, so this gap also is tortuous circuitous gap, like this, because multichannel is multiple to be stopped, reduces pressure, the smoke spillage amount significantly is suppressed, and leakage rate is minimum, has reduced the pollution of flue gas to external environment condition.

Claims

1, a kind of labyrinth seal is characterized in that being provided with at least in two the ring cylindrical shape closed chambers of all grooves and the groove that crouches and with the seal ring of groove Spielpassung by inwall and forms, and the seal ring internal diameter is slightly less than cylindrical shape closed chamber inner diameter.

2, a kind of labyrinth seal according to claim 1 is characterized in that there is chamfering on the cell wall top of described groove.