CN218760037U

CN218760037U - Steam turbine high pressure gland seal expansion ring steam-blocking combined structure

Info

Publication number: CN218760037U
Application number: CN202223272758.XU
Authority: CN
Inventors: 范美玉
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-03-28
Anticipated expiration: 2032-12-07

Abstract

The utility model discloses a steam turbine high pressure gland expansion ring hinders vapour integrated configuration, including the gland ring body that encircles the setting of steam turbine pivot, the gland ring body includes the gland cover and arranges fixed a plurality of steam ring that hinder on the gland cover side by side, it is provided with long steam tooth and short steam tooth that hinder to hinder the steam ring interval, it is provided with the water conservancy diversion clearance to meet the steam flow direction between the steam ring to hinder two, the water conservancy diversion clearance is greater than 90 degrees slant water conservancy diversion clearances with the contained angle of steam flow direction, water conservancy diversion clearance export sets up a steam flow dissipation cavity, steam flow dissipation cavity is by adjacent steam ring back and the common combination of gland cover and form of hindering. The steam-blocking ring is provided with a steam-flow return hole, and the steam-blocking rings on the two sides of the flow-guiding gap are respectively provided with a plurality of irregular flow-guiding teeth in the steam-flow dissipation cavity for consuming the kinetic energy of the steam flow; the utility model discloses a meeting between two steam stop rings and being provided with water conservancy diversion clearance and steam flow dissipation cavity to the steam flow direction, can hindering the steam flow to flow fast, consumption steam flow kinetic energy has improved the sealed effect that the steam stop ring.

Description

Steam turbine high pressure gland seal expansion ring steam-blocking combined structure

Technical Field

The utility model relates to a steam turbine high pressure vapor seal expansion ring hinders vapour integrated configuration utilizes to hinder vapour inter-annular structure and hinders vapour ring and the gland casing structural space design steam flow inflation and power consumption cavity.

Background

The modern steam turbine is developed along with the manufacturing technology, the working steam has high temperature and large pressure, and the dynamic and static sealing is always a difficult problem which is difficult to solve. At present, most main thermal power generator types are high-middle pressure cylinder units, the rotor shaft systems are long, steam seals between cylinder closing and bridge passing units have large deflection due to high-speed rotation of rotors, the shaft systems expand greatly under the action of high temperature, compared with the cold installation, the axial expansion of high-middle pressure rotors reaches 2 to 3 millimeters, so that axial sealing cannot be abutted against sealing points of rotor bosses during installation, if the sealing rings are easily interfered during forward installation, sealing cannot be realized during reverse installation due to the fact that the rotors are far away from the sealing rings after expansion, radial sealing abrasion is severe due to vibration when the units are started in a cold state and are over critical, and the increasing efficiency of dynamic and static gaps of the units is sharply attenuated after the units are started and stopped for many times. The traditional radial sealing technology cannot be used for solving the problem, and the sealing element can only be replaced by uncovering the cylinder for overhauling after an overhaul period. Two key elements of shaft system sealing are the length of a sealing path and a sealing gap, after the production and the manufacture of the steam turbine are finished, the length of the shaft system cannot be changed, only the sealing gap can be reduced, and the sealing gap cannot be too small due to dynamic and static friction, so that the great sealing problem is brought to a unit which runs throughout the year.

Disclosure of Invention

An object of the utility model is to provide a steam turbine high pressure gland seal expansion ring hinders vapour integrated configuration is provided with water conservancy diversion clearance and steam flow dissipation cavity through meeting the steam flow direction between two hinder vapour rings, can hinder the steam flow fast flow, consumes the steam flow kinetic energy, improves sealed effect.

In order to realize the purpose, the utility model discloses a scheme is:

the utility model provides a steam turbine high pressure gland expansion ring integrated configuration that blocks steam, is including encircleing the gland ring body that the steam turbine pivot set up, and the gland ring body includes the gland cover and arranges fixed a plurality of rings that block steam side by side towards the steam turbine pivot on the gland cover, blocks that the ring is provided with long blocking tooth and short blocking tooth in the face of the steam turbine pivot interval, wherein: a flow guide gap is arranged between at least two steam blocking rings in the direction facing the steam flow direction, the flow guide gap is an oblique flow guide gap, the included angle between the flow guide gap and the steam flow direction is larger than 90 degrees, a steam flow dissipation cavity is arranged at an outlet of the flow guide gap, the steam flow dissipation cavity is formed by combining the back of the adjacent steam blocking rings and a steam sleeve together, a steam flow backflow hole is formed in the steam blocking ring, the included angle between the steam flow dissipation cavity and the steam flow direction is larger than 90 degrees, and a plurality of irregular flow guide teeth are arranged in the steam flow dissipation cavity on the back of the steam blocking rings on the two sides of the flow guide gap respectively to consume steam flow kinetic energy.

The scheme is further as follows: the number of the irregular flow guide teeth arranged on the steam blocking ring provided with the steam flow return hole is more than that of the irregular flow guide teeth arranged on the steam blocking ring on the other side, and the steam flow return hole is arranged between the two irregular flow guide teeth.

The scheme is further as follows: the included angle between the flow guide gap and the steam flow direction is 100-120 degrees.

The scheme is further as follows: the flow guide gap is a conical gap with a narrow inlet and a wide outlet.

The scheme is further as follows: the flow guide gap is arranged close to the long steam-blocking teeth of the steam-blocking ring.

The scheme is further as follows: and a flow guide gap is arranged between every two steam blocking rings.

The utility model discloses it is advantage with prior art's contrast: the expansion energy consumption space formed by matching the steam-blocking rings and the steam sealing sleeve is utilized, the steam-blocking capacity is designed to the external space of the steam seal for the first time, the guide gap and the steam flow dissipation cavity are arranged between the two steam-blocking rings in the direction facing to the steam flow direction, the steam flow can be blocked from flowing fast, and the steam flow kinetic energy is consumed to improve the sealing effect of the steam-blocking rings.

The present invention will be described in detail with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is a schematic view of a steam seal ring configuration of a steam turbine;

fig. 2 is a schematic view of the sealing structure of the present invention;

fig. 3 is a schematic view of the expansion principle of the gland seal of the sealing structure of the present invention, and an enlarged view of a portion a of fig. 2.

Detailed Description

The utility model provides a steam turbine high pressure gland expansion ring integrated configuration that blocks vapour, as shown in fig. 1 and fig. 2, high pressure gland expansion ring integrated configuration that blocks vapour includes the vapour circular arc seal ring body 2 that encircles the multistage concatenation that steam turbine pivot 1 set up, and the vapour seal ring body 2 includes gland cover 201 and arranges fixed a plurality of steam blocking ring 3 side by side towards the steam turbine pivot on the gland cover, blocks the vapour ring and is provided with long steam blocking tooth 301 and short steam blocking tooth 302 in the face of 1 interval of steam turbine pivot, wherein: a flow guide gap 303 is arranged between at least two steam stop rings facing to the steam flow direction, the flow guide gap 303 is an oblique flow guide gap with an included angle 304 with the steam flow direction a larger than 90 degrees, a steam flow dissipation cavity 305 is arranged at an outlet of the flow guide gap, the steam flow dissipation cavity is formed by combining the back of the adjacent steam stop ring and a steam sleeve together, a steam flow backflow hole 306 is arranged on the steam stop ring with an included angle larger than 90 degrees with the steam flow direction, and a plurality of irregular flow guide teeth 307 are respectively arranged on the backs of the steam stop rings 2 on two sides of the flow guide gap in the steam flow dissipation cavity to consume steam flow kinetic energy. Wherein: the number of the irregular guide teeth arranged on the steam stop ring provided with the steam flow return hole is more than that of the irregular guide teeth arranged on the steam stop ring on the other side, and the steam flow return hole 306 is arranged between the two irregular guide teeth 307.

In the examples: the included angle between the flow guide gap and the steam flow direction is 100-120 degrees. And the flow guide gap is a conical gap with a narrow inlet and a wide outlet. The diversion gap is arranged close to the long steam-resistant tooth of the steam-resistant ring.

One preferred scheme is as follows: and a flow guide gap is arranged between every two steam blocking rings.

The steam seal expansion principle of the embodiment is as follows: the inclined flow guide gap and the steam flow dissipation cavity 305 are formed between the two steam blocking rings 3 in a matched mode, a main steam flow a flows into the second-stage steam seal long steam blocking tooth 301 from the upper-stage steam seal and is divided into two steam flows b and c, one steam flow c rushes into the dissipation cavity, the branch flow channel at c is larger than the steam seal gap (the gap between the long steam blocking tooth 301 and the short steam blocking tooth 302 and the rotating shaft 1) by multiple times, a plurality of irregular flow guide teeth are arranged in the dissipation cavity 305, the flow guide teeth guide the steam flow on one hand, on the other hand, the steam flow is blocked from flowing fast, and the steam flow kinetic energy is consumed. The dissipation chamber is outside the gland seal tooth, and the diameter is greater than the gland seal and rotor clearance a lot, and whole space is huge, does benefit to the steam flow and fully expands, therefore gets into the steam flow in dissipation chamber and becomes low-speed low energy steam. The position d is the joint part of the rotor boss 101 and the short steam blocking tooth 302, the gap is small, the steam flow rate is high, and according to the Bernoulli principle: the fast pressure of velocity of flow is little, so produce the vacuum, the steam in the return line of suction d department, the low energy slow speed steam in the dissipation intracavity is sucked out and is further hindered the gland steam and reveal. Therefore, all the gap bridge steam seals are combined together to be like a huge silencer, and the sealing effect of the gap bridge steam seals can be improved inevitably.

According to the embodiment of the steam turbine high-pressure steam seal expansion ring steam blocking combined structure, the steam blocking capacity is designed to the steam seal outer space for the first time by utilizing the expansion energy consumption space formed by matching the steam blocking ring and the steam seal sleeve, the flow guide gap and the steam flow dissipation cavity are arranged between the two steam blocking rings in the direction facing the steam flow direction, the steam flow dissipation cavity is formed by combining the back of the adjacent steam blocking ring and the steam seal sleeve together, the steam flow can be blocked from flowing fast, and the steam flow kinetic energy is consumed to improve the sealing effect of the steam blocking rings.

Claims

1. The utility model provides a steam turbine high pressure gland expansion ring hinders vapour integrated configuration, including the gland ring body that encircles the setting of steam turbine pivot, the gland ring body includes the vapour envelope and arranges a plurality of steam blocking rings fixed side by side towards the steam turbine pivot on the gland envelope, steam blocking ring is provided with long steam blocking tooth and short steam blocking tooth towards the interval of steam turbine pivot, its characterized in that, be provided with the water conservancy diversion clearance between two at least steam blocking rings to the steam flow direction, the water conservancy diversion clearance is the slant water conservancy diversion clearance that is greater than 90 degrees with the contained angle of steam flow direction, water conservancy diversion clearance export sets up a steam flow dissipation cavity, steam flow dissipation cavity is formed by adjacent steam blocking ring back and the common combination of steam envelope, be provided with steam flow backward flow hole on the steam blocking ring that forms the contained angle with the steam flow direction and is greater than 90 degrees side, the steam blocking ring back of water conservancy diversion clearance both sides is provided with a plurality of irregular water conservancy diversion teeth respectively in steam flow dissipation cavity and is used for steam consumption to flow kinetic energy.

2. The steam turbine high pressure gland seal expansion ring steam stop composite structure according to claim 1, wherein the number of irregular guide teeth provided on the steam stop ring provided with the steam flow return hole is greater than the number of irregular guide teeth provided on the steam stop ring on the other side, and the steam flow return hole is provided between two irregular guide teeth.

3. The steam turbine high pressure gland seal expansion ring steam stop assembly structure of claim 1, wherein the flow guide gap is at an angle of 100 to 120 degrees to the direction of steam flow.

4. The steam turbine high pressure gland seal expansion ring steam stop assembly structure of claim 1, wherein said flow guide gap is a tapered gap with a narrow inlet and a wide outlet.

5. The steam turbine high pressure gland seal expansion ring steam stop composite structure according to claim 1, wherein the flow guide gap is disposed in close proximity to the long steam stop tooth of the steam stop ring.

6. The steam turbine high pressure gland seal expansion ring steam block composite structure according to claim 1, wherein a flow guide gap is provided between each two steam block rings.