CN218093157U

CN218093157U - Integral baffle radial steam seal structure of steam turbine

Info

Publication number: CN218093157U
Application number: CN202221614426.2U
Authority: CN
Inventors: 龙国强; 亓磊; 郭金闯; 李桐; 李睿
Original assignee: Shandong Qilu Motor Manufacturing Co Ltd
Current assignee: Shandong Qilu Motor Manufacturing Co Ltd
Priority date: 2022-06-24
Filing date: 2022-06-24
Publication date: 2022-12-20
Anticipated expiration: 2032-06-24

Abstract

The utility model discloses a radial vapor seal structure of integral baffle of steam turbine belongs to steam turbine equipment technical field, including stator blade, moving blade, baffle body and impeller, baffle body top installation stator blade, impeller top installation moving blade, runner between stator blade and the moving blade has formed the sprue of steam flow the balance hole outer fringe department of impeller sets up trapezoidal platform in the baffle body footpath department be equipped with the protruding corresponding baffle recess of trapezoidal platform of impeller, radially set up radial vapor seal tooth in the baffle recess, make the sealed girth of vapor seal fall to minimum, under the unchangeable condition in gas leakage clearance, the gas leakage area is also minimum, and then reduces interstage gas leakage, reaches better sealed effect.

Description

Integral baffle radial steam seal structure of steam turbine

Technical Field

The utility model belongs to the technical field of steam turbine equipment, especially, relate to a radial vapor seal structure of integral baffle of steam turbine.

Background

In the design of steam turbines, in order to avoid collisions caused by uneven dynamic and static expansion, a certain axial clearance is required between the dynamic and static components in the stage. The axial clearance causes the axial steam sealing function at the root part of the steam inlet side of the blade to be poor, the steam leakage quantity of the steam passage is increased, and the main steam flow is disturbed to reduce the efficiency. In order to reduce the influence caused by the increase of the axial clearance, a partition plate radial steam seal is widely adopted in the design of a steam turbine. The steam seal is an important part in the steam turbine and is mainly used for sealing gaps of moving and static parts of the steam turbine.

The utility model discloses a chinese utility model patent that the publication number of authorizing is CN201288590 discloses a radial vapor seal structure of integral baffle of steam turbine, including movable blade, quiet leaf, baffle body and impeller, baffle body upper portion is equipped with quiet leaf, and the movable blade is equipped with at the impeller top, forms the steam passage between movable blade and the quiet leaf, and the impeller top is equipped with convex platform along the axial, the axial direction parallel at platform top and impeller top, baffle body upper portion be equipped with the convex corresponding recess of platform in impeller top, the recess below is provided with radial vapor seal piece along baffle body radial. The utility model discloses a set up the gland piece on the baffle body, seal the clearance between baffle body recess and impeller protrusion platform, realize and the radial gland sealing between the impeller. However, in order to increase the flexibility of the steam turbine, the modern steam turbine set generally increases the axial clearance between the rotor impeller and the partition plate, so that the radial steam sealing effect is reduced, the air leakage is increased, the flow direction of the main air flow is disturbed, and the efficiency of the steam turbine is reduced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defect that makes radial vapor lock effect reduce because of the increase of the axial clearance between impeller and the baffle among the prior art, the utility model provides a radial vapor lock structure of integral baffle of steam turbine can reduce axial gas leakage area under equal technical condition, improves sealed effect, and then improves through-flow efficiency.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a radial vapor seal structure of integral baffle of steam turbine, includes stator blade, moving blade, baffle body and impeller, and baffle body top installation stator blade, impeller top installation moving blade, the runner between stator blade and the moving blade has formed the sprue of steam flow the balancing hole outer fringe department of impeller sets up trapezoidal platform the baffle body middle diameter department is equipped with the baffle recess corresponding with the protruding trapezoidal platform of impeller, radially sets up radial vapor seal tooth in the baffle recess.

As the further improvement of the utility model, the stationary blade is installed on the baffle body through the shroud vapor seal of welding at the stationary blade.

As a further improvement of the utility model, the impeller top sets up the root groove, moving blade one end embedding is installed in the root groove.

As a further improvement, the baffle groove in the baffle body is provided with a trapezoidal groove, and the end part of the trapezoidal table stretches into the trapezoidal groove.

As a further improvement of the utility model, axial gland sealing teeth are arranged in the trapezoidal grooves.

As a further improvement of the utility model, the side face of the trapezoidal bench is parallel to the axial direction of the impeller.

Compared with the prior art, the utility model discloses beneficial effect who has: the utility model discloses a set up trapezoidal platform in the balancing hole outer fringe department of impeller, trapezoidal bench side and axial direction are parallel, and the footpath department is equipped with the baffle recess corresponding with the trapezoidal platform that the impeller is outstanding in the baffle body, radially sets up radial vapor seal tooth in the baffle recess, makes the sealed girth of vapor seal fall to the minimum, under the unchangeable condition in gas leakage clearance, the gas leakage area is also minimum, and then reduces interstage gas leakage, reaches better sealed effect.

Drawings

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.

In the figure: 1. a stationary blade; 2. moving blades; 3. radial gland sealing teeth; 4. a trapezoidal table; 5. a separator plate groove; 6. a balance hole; 7. a separator body; 8. an impeller; 9. enclosing a belt and sealing by steam; 10. a main flow channel; 11. a leaf root groove; 12. a trapezoidal groove; 13. and axial gland sealing teeth.

Detailed Description

In order to make the technical solution and the advantageous effects of the present invention more clear, the present invention will be further described in detail with reference to the following embodiments.

Referring to fig. 1, the embodiment of the present invention discloses an integral diaphragm radial steam seal structure of a steam turbine, which includes a stationary blade 1, a moving blade 2, a diaphragm body 7 and an impeller 8, wherein the stationary blade 1 is installed on the top of the diaphragm body 7, the moving blade 2 is installed on the top of the impeller 8, the stationary blade 1 is welded on a shroud steam seal 9 and then installed on the diaphragm body 7, the moving blade 2 is installed on a blade root slot 11 on the top of the impeller 8, and a main flow channel 10 of steam flow is formed by a flow channel between the stationary blade 1 and the moving blade 2; an axial gap is present between the stator blades 1 and the rotor blades 2, which gap forms a radial steam leakage channel.

The flow passage between the stationary blade 1 and the moving blade 2 forms a main flow passage 10 of the steam flow, a trapezoidal table 4 is arranged at the outer edge of the balance hole 6 of the impeller 8, and the upper side surface of the trapezoidal table 4 is parallel to the axial direction of the impeller. The middle diameter of the clapboard body 7 is provided with a clapboard groove 5 corresponding to the trapezoid table 4 protruded from the impeller 8, and the radial steam seal teeth 3 are arranged along the inner diameter of the clapboard groove 5. Radial steam seal tooth 3 seals the clearance between baffle recess 5 on the baffle body 7 and the convex trapezoidal platform 4 of impeller 8, realizes the radial steam seal between baffle body 7 and impeller 8, arranges like this and to make the sealed girth of steam seal structure fall to minimum, and under the unchangeable condition in gas leakage clearance, the gas leakage area is also minimum, and then has reduced interstage gas leakage, reaches better sealed effect. The improvement of this setting is simple reliable, and processing is convenient, has effectively reduced the steam leakage volume of steam flue, is favorable to improving steam turbine efficiency, also is favorable to improving the start-stop performance of unit.

Referring to fig. 2, the present embodiment is different from embodiment 1 in that a trapezoidal groove 12 is provided in the partition body 7 at the partition groove 5, and the end of the trapezoidal table 4 is inserted into the trapezoidal groove 12. An axial gland tooth 13 is arranged in the trapezoidal groove 12. The axial steam seal tooth 13 seals the gap between the baffle groove 5 on the baffle plate body 7 and the trapezoidal platform 4 protruded from the impeller 8, so that the axial steam seal between the baffle plate body 7 and the impeller 8 is realized, the interstage gas leakage is reduced, and a better sealing effect is achieved.

It should be understood that the detailed description and specific examples, while indicating the invention, are given by way of illustration only, not by way of limitation, since other embodiments will become apparent to those skilled in the art upon consideration of the following detailed description of the invention without any creative effort.

Claims

1. The utility model provides a radial steam seal structure of integral baffle of steam turbine, includes stator blade (1), moving blade (2), baffle body (7) and impeller (8), and baffle body (7) top installation stator blade (1), impeller (8) top installation moving blade (2), runner between stator blade (1) and moving blade (2) has formed mainstream sprue (10) of steam flow, its characterized in that: the outer edge of a balance hole (6) of the impeller (8) is provided with a trapezoidal table (4), the middle diameter of the clapboard body (7) is provided with a clapboard groove (5) corresponding to the trapezoidal table (4) which protrudes out of the impeller (8), and radial steam seal teeth (3) are radially arranged along the inner diameter of the clapboard groove (5).

2. The integral diaphragm radial gland seal structure of a steam turbine according to claim 1, wherein: the static blades (1) are arranged on the clapboard body (7) through shroud vapor seals (9) welded on the static blades (1).

3. The integral diaphragm radial gland seal structure of a steam turbine according to claim 1, wherein: the top of the impeller (8) is provided with a blade root groove (11), and one end of the moving blade (2) is embedded in the blade root groove (11).

4. The integral diaphragm radial gland seal structure of a steam turbine according to claim 1 or 2, wherein: baffle recess (5) in the baffle body (7) set up dovetail groove (12), trapezoidal platform (4) tip stretches into dovetail groove (12) in.

5. The integral diaphragm radial gland seal structure of a steam turbine according to claim 4, wherein: an axial steam seal tooth (13) is arranged in the trapezoidal groove (12).

6. The integral diaphragm radial gland seal structure of a steam turbine according to claim 4, wherein: the upper side surface of the trapezoidal table (4) is axially parallel to the impeller (8).