CN115163211A

CN115163211A - Compact shaft end steam seal of steam turbine

Info

Publication number: CN115163211A
Application number: CN202210883614.3A
Authority: CN
Inventors: 赵元国; 张红梅; 沈浩
Original assignee: Shandong Qilu Motor Manufacturing Co Ltd
Current assignee: Shandong Qilu Motor Manufacturing Co Ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2022-10-11

Abstract

The invention discloses a compact shaft end steam seal of a steam turbine, which belongs to the technical field of steam turbine equipment and comprises a rotor, a steam seal ring and a steam seal cover for mounting the steam seal ring, wherein steam seal comb teeth are arranged on the inner surface of the steam seal ring, an annular groove is arranged on the outer surface of the rotor, a steam seal ring sheet is fixed in the annular groove through embedded wires, the steam seal comb teeth and the steam seal ring sheet are arranged in a staggered mode to form a steam flow channel, the steam seal ring sheet is arranged on the rotor, the number of the steam seal teeth on a unit length can be encrypted, the sealing performance is better, the steam leakage amount of a shaft end is smaller, and when the same number of steam seal teeth are adopted, the axial length is smaller on the premise of ensuring the sealing effect, and the integral structure of the steam seal at the shaft end is more compact.

Description

Compact shaft end steam seal of steam turbine

Technical Field

The invention belongs to the technical field of steam turbine equipment, and particularly relates to a compact shaft end steam seal of a steam turbine.

Background

The steam turbine is a rotating machine which takes steam as power and converts the heat energy of the steam into mechanical work, and after the steam from a boiler enters the steam turbine, the steam passes through a series of nozzles and movable blades which are annularly arranged in sequence to convert the heat energy of the steam into the mechanical energy of the rotation of a steam turbine rotor. Is the most widely applied prime mover in the modern thermal power plant. Comprises a rotating part and a static part. The static part consists of a gas inlet part, a cylinder, a partition plate, a static blade bar, a gas seal, a bearing and other mechanisms, wherein the cylinder in the static part is a shell of the steam turbine and separates a through-flow part of the steam turbine from the atmosphere to form a closed gas chamber inside the steam turbine, so that the steam can complete an energy conversion process inside the steam turbine; the rotating part is also called as a rotor, and the rotor consists of a main shaft, an impeller, a moving blade, a coupling and other structures.

The clearance between the rotor and the stator can lead to steam leakage, which not only reduces unit efficiency, but also affects unit safe operation. To prevent steam leakage and air ingress, a sealing device, commonly referred to as a gland seal, is required. In modern steam turbine design, in order to prevent high-temperature high-pressure steam from leaking, a common method is to arrange a shaft end steam seal at the position where a rotor penetrates out of a cylinder, usually, a structure of a high-low platform comb-tooth steam seal is adopted, comb teeth are designed on a steam seal ring, and a high-low platform is arranged on the rotor and has certain axial width, but the structural design of the high-low platform increases the distance between the steam seal teeth, so that the structure is loose, and the sealing performance is reduced.

Disclosure of Invention

In order to overcome the defect that the sealing performance is reduced due to loose structure in the prior art, the invention provides a compact shaft end steam seal of a steam turbine, which has the advantages of compact structure, good sealing effect, capability of reducing the leakage amount of steam and improvement on the efficiency of a unit.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a compact axle head vapor seal of steam turbine, includes rotor, vapor seal circle and is used for installing the vapor seal cover of vapor seal circle the vapor seal circle internal surface sets up the vapor seal broach the rotor surface sets up the annular groove, install the vapor seal ring piece on the annular groove, the vapor seal ring piece is fixed in the annular groove through inlaying the silk, vapor seal broach and vapor seal ring piece crisscross the setting and form the steam flow passageway.

As a further improvement of the present invention, a fixing groove is provided in the gland sleeve, and the gland ring is embedded in the fixing groove.

As a further improvement of the invention, a spring ring sheet for tensioning the steam seal ring is arranged in the fixed groove.

As a further improvement of the invention, the top end of the gland sealing comb tooth and the outer diameter of the rotor form a narrow air flow channel in the radial direction.

As a further improvement of the invention, the top end of the steam seal ring sheet and the inner diameter of the steam seal ring form a narrow air flow channel in the radial direction.

As a further improvement of the invention, the steam seal comb teeth and the steam seal ring sheets form a narrow steam flow channel in the axial direction.

As a further improvement of the invention, the gland sealing ring sheet is in a J shape.

As a further improvement of the invention, the horizontal height of the embedded wire after the gland sealing ring piece is fixed is larger than the horizontal height of the rotor.

Compared with the prior art, the invention has the following beneficial effects: the steam seal ring plate is arranged on the rotor, so that the number of steam seal teeth on a unit length can be encrypted, the sealing performance is better, the steam leakage amount of the shaft end is smaller, and when the same number of steam seal teeth are adopted, the axial length is smaller on the premise of ensuring the sealing effect, so that the integral structure of the steam seal at the shaft end is more compact.

Drawings

The invention is further described with reference to the following figures and detailed description.

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a schematic structural diagram of example 2 of the present invention;

in the figure: 1. a rotor; 2. a steam seal ring; 3. a steam envelope; 4. sealing the comb teeth by steam; 5. an annular groove; 6. a gland sealing ring sheet; 7. embedding wires; 8. fixing the groove; 9. a spring ring sheet.

Detailed Description

In order to make the technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following specific embodiments.

Referring to fig. 1, the embodiment 1 of the invention discloses a compact shaft end steam seal of a steam turbine, which comprises a rotor 1, a steam seal ring 2, a steam seal sleeve 3, steam seal comb teeth 4, an annular groove 5, steam seal ring pieces 6 and embedded wires 7, wherein the steam seal comb teeth 4 and the steam seal ring pieces 6 are arranged in a staggered manner and form a steam flow channel in the axial direction.

Referring to fig. 1, a steam seal ring 2 is assembled and fixed on a steam seal sleeve 3, steam seal comb teeth 4 are arranged at the top end in the steam seal ring 2, and narrow air flow channels are formed at the top end of the steam seal comb teeth 4 and the outer diameter of a rotor 1 in the radial direction. The annular groove 5 is arranged on the outer surface of the rotor 1, the steam seal ring piece 6 is J-shaped, the steam seal ring piece 6 is fixed in the annular groove 5 through the embedded wire 7, and the top end of the steam seal ring piece 6 and the inner diameter of the steam seal ring 2 form a narrow air flow channel in the radial direction.

Referring to fig. 1, a fixing groove 8 is provided in the gland bush 3, and the gland ring 2 is fitted into the fixing groove 8. A spring ring sheet 9 for tensioning the steam seal ring 2 is arranged in the fixed groove 8.

According to the invention, the steam seal ring piece 6 is arranged on the rotor 1, so that steam alternately passes through the narrow steam flow channel of the steam seal ring piece 6 on the rotor 1 and the steam seal comb teeth 4 on the steam seal ring 2, and the effective sealing quantity can be encrypted under the condition of the same axial space to achieve a better sealing effect, so that the steam leakage quantity of the steam channel is reduced to the minimum, compared with the arrangement that the interval span of the steam seal comb teeth 4 in the prior art is small, the sealing strip quantity is encrypted to a certain extent, the sealing performance is better, the structure is more compact, and the steam leakage quantity is smaller.

Referring to fig. 2, the difference between the present embodiment and embodiment 1 is that the horizontal height of the embedded wire 7 after fixing the gland sealing ring plate 6 is greater than the horizontal height of the rotor 1, so that the embedded wire 7 and the gland sealing comb teeth 4 form a structure of a comb gland seal, and the sealing performance is better.

It should be understood that the detailed description and specific examples, while indicating the invention, are given by way of illustration only, since various other embodiments will become apparent to those skilled in the art upon reference to the following detailed description.

Claims

1. The utility model provides a compact axle head gland seal of steam turbine which characterized in that: including rotor (1), gland sealing circle (2) and be used for installing gland sealing circle (2) gland sealing cover (3) gland sealing circle (2) internal surface sets up gland sealing broach (4) rotor (1) surface sets up annular groove (5), and gland sealing ring piece (6) are fixed in annular groove (5) through rule (7), gland sealing broach (4) and gland sealing ring piece (6) crisscross setting form the steam flow passageway.

2. The compact shaft end gland seal according to claim 1 wherein: a fixing groove (8) is formed in the steam seal sleeve (3), and the steam seal ring (2) is embedded in the fixing groove (8).

3. The compact shaft end gland seal according to claim 2, wherein: a spring ring sheet (9) for tensioning the steam seal ring (2) is arranged in the fixed groove (8).

4. The compact shaft end gland seal according to claim 1 wherein: narrow air flow channels are formed between the top ends of the steam seal comb teeth (4) and the outer diameter of the rotor (1) in the radial direction.

5. The compact shaft end gland seal according to claim 1 wherein: the top end of the steam seal ring piece (6) and the inner diameter of the steam seal ring (2) form a narrow air flow channel in the radial direction.

6. The compact shaft end gland seal according to claim 1 wherein: the steam seal comb teeth (4) and the steam seal ring pieces (6) form a narrow steam flow channel in the axial direction.

7. The compact shaft end gland seal according to claim 6 wherein: the steam seal ring piece (6) is J-shaped.

8. The compact shaft end gland seal according to claim 1 wherein: the horizontal height of the embedded wire (7) after the gland sealing ring sheet (6) is fixed is larger than that of the rotor (1).