CN215804736U

CN215804736U - Brush type gas seal with protection structure for industrial gas turbine

Info

Publication number: CN215804736U
Application number: CN202122065915.9U
Authority: CN
Inventors: 拓慧荣; 刘帅
Original assignee: Shaanxi Situo Metal Sealing Technology Co ltd
Current assignee: Shaanxi Situo Metal Sealing Technology Co ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-02-11
Anticipated expiration: 2031-08-30

Abstract

The utility model discloses a brush type air seal with a protection structure for an industrial gas turbine, which comprises a sealing body, wherein air seal teeth are installed at the bottom of the sealing body, a brush seal groove is formed in the bottom wall of the sealing body, a brush seal is welded inside the brush seal groove, a bottom plate is installed at the bottom of the brush seal, a front baffle is installed at the bottom of the bottom plate, and a rear baffle is installed at the bottom of the bottom plate. According to the utility model, the front baffle and the rear baffle are arranged, the front baffle is used for reducing the moving amplitude of the long brush wires and avoiding the excessive deformation of the long brush wires in the process of moving along with the brush seal due to thermal expansion and the like, the rear baffle is used for reducing the moving amplitude of the tail ends of the short brush wires and avoiding the long-time excessive deformation of the short brush wires, and the front baffle and the rear baffle can prevent the rotor from directly contacting with the seal body and avoid damaging the seal body, so that the front baffle and the rear baffle have good protection effect.

Description

Brush type gas seal with protection structure for industrial gas turbine

Technical Field

The utility model relates to the technical field of brush type gas seals, in particular to a brush type gas seal with a protection structure for an industrial gas turbine.

Background

Industry gas turbine's rotor is when rotating, and the clearance between the fixed body leads to fluidic revealing easily, and then can lead to energy inefficiency, brush seal is as a novel contact gas circuit seal, it is low than traditional labyrinth seal leakage quantity to let out leakage quantity, this is because brush seal has flexible close-packed brush silk, can rebound rapidly after the rotor is radial displacement by a wide margin in the twinkling of an eye in the engine, consequently, good sealing performance has, thereby improve turbomachinery's efficiency and stability in the industry gas turbine greatly.

The existing brush type air sealing device has the defects that:

1. the Chinese novel practical patent with the publication number of CN204060816U discloses a novel gas turbine stationary blade ring brush type air seal, which comprises a brush and a brush seal, wherein the brush seal is provided with a channel, and the brush is positioned in the channel of the brush seal; the brush comprises brush front block, brush rear block and brush silk cluster, and the brush package is including brush seal front backplate and brush seal rear backplate, and the brush seals and sets up radial positioning face and location connecting hole, and radial positioning face plays spacing on the direction of height, and brush seal front backplate and brush seal rear backplate pass through radial positioning face adjustment outer fringe and align, through bolt pretension in the location connecting hole.

However, the brush type gas seal for an industrial gas turbine of the above publication lacks a protective structure, and the brush wires and the seal body may be damaged during high-speed rotation of the device.

In view of the above, there is a need for an industrial gas turbine with a protective structure.

2. When the brush wires of the existing brush type air seal are easy to have delayed effect, fluid can be leaked, and the utilization efficiency of energy is not increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a brush type air seal for an industrial gas turbine with a protective structure, so as to solve the problems mentioned in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides an industry is brush atmoseal for gas turbine with protective structure, includes the seal, the atmoseal tooth is installed to the bottom of seal.

The diapire of seal is equipped with the brush seal groove, the inside welding in brush seal groove has the brush to seal, the bottom plate is installed to the bottom of brush seal.

Preferably, the bottom of the bottom plate is provided with a front baffle, and the bottom of the bottom plate is provided with a rear baffle.

Preferably, the bottom of the bottom plate is provided with the long brush wires, and the long brush wires are positioned on one side of the front baffle.

Preferably, the bottom of the bottom plate is provided with an aluminum foil, and the aluminum foil is positioned on the other side of the long brush wires.

Preferably, the bottom of the bottom plate is provided with short brush wires, and the short brush wires are positioned on one side of the aluminum foil.

Preferably, the front baffle and the rear baffle are internally provided with air inlet holes in a penetrating manner.

Preferably, the bottom of the bottom plate is provided with a clearance cavity A through the front baffle plate and the long brush wires, and the bottom of the bottom plate is provided with a clearance cavity B through the rear baffle plate and the short brush wires.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, the front baffle and the rear baffle are arranged, the front baffle is used for reducing the moving amplitude of the long brush wires and avoiding the excessive deformation of the long brush wires in the process of moving along with the brush seal due to thermal expansion and the like, the rear baffle is used for reducing the moving amplitude of the tail ends of the short brush wires and avoiding the long-time excessive deformation of the short brush wires, and the front baffle and the rear baffle can prevent the rotor from directly contacting with the seal body and avoid damaging the seal body, so that the front baffle and the rear baffle have good protection effect.

2. According to the utility model, the long brush wires, the aluminum foil sheets and the short brush wires are arranged, the long brush wires have a certain inclination angle to reduce the abrasion of the brush wires and keep the sealing gap unchanged, the friction between the long brush wires and the short brush wires can be reduced by arranging the aluminum foil sheets, the hysteresis effect of the long brush wires is avoided, and the long brush wires are beneficial to restoring the original shape, so that the sealing performance of the long brush wires to the rotor is further improved, the impulsive force of fluid to the long brush wires can be reduced by arranging the short brush wires, the fluid is blocked, and the leakage of the fluid is reduced.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of a gas seal tooth of the present invention;

FIG. 3 is a schematic structural view of a brush seal according to the present invention;

FIG. 4 is a schematic structural view of the short brush filaments and the long brush filaments of the present invention;

fig. 5 is a schematic view of the front and rear baffles of the present invention.

In the figure: 1. a seal body; 2. air seal teeth; 201. brushing and sealing the groove; 3. brushing and sealing; 301. a base plate; 4. a front baffle; 5. a tailgate; 6. short brush wires; 7. an aluminum foil sheet; 8. long brush filaments; 9. a interstitial cavity A; 10. a gap cavity B; 11. and (4) air inlet holes.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the first embodiment, please refer to fig. 1, fig. 4 and fig. 5, an embodiment of the present invention: the utility model provides an industry is brush atmoseal for gas turbine with protective structure, includes seal 1, atmoseal tooth 2 is installed to seal 1's bottom, seal 1's diapire is equipped with brush seal groove 201, the inside welding of brush seal groove 201 has brush seal 3, bottom plate 301 is installed to brush seal 3's bottom, baffle 4 before the bottom of bottom plate 301 is installed, backplate 5 is installed to bottom plate 301's bottom.

Specifically, seal 1 plays the effect of support to atmoseal tooth 2, atmoseal tooth 2 is used for blockking that high-pressure draught reveals, brush seals 3 through with brush seal groove 201 welding, can guarantee that brush seals 3 and seal 1 firm connection, and joint strength is high, it is sealed effectual, the installation of bottom plate 301 is used for installing other parts, play good supporting role to other parts, preceding baffle 4 is used for reducing the range that long brush silk 8 removed, avoid long brush silk 8 to take place excessive deformation along with the in-process that brush sealed 3 removed because of reasons such as thermal energy, backplate 5 is used for reducing the tail end removal range of short brush silk 6, avoid short brush silk 6 to take place excessive deformation, consequently preceding baffle 4 and backplate 5 have good guard action.

Second embodiment, as shown in fig. 1, a brush type air seal for an industrial gas turbine with a protective structure includes a long brush wire 8, the long brush wire 8 is installed at the bottom of a bottom plate 301, the long brush wire 8 is located on one side of a front baffle 4, an aluminum foil 7 is installed at the bottom of the bottom plate 301, the aluminum foil 7 is located on the other side of the long brush wire 8, a short brush wire 6 is installed at the bottom of the bottom plate 301, and the short brush wire 6 is located between a rear baffle 5 and the aluminum foil 7.

Specifically, the free ends of the long brush wires 8 are in contact with the surface of the rotor of the gas turbine, the long brush wires 8 have a certain inclination angle, so as to reduce the abrasion of the brush wires, lead the brush wires to be more easily adapted to the manufacturing error, the thermal deformation and the like of the rotor, lead the brush wires to rebound quickly after the rotor is in large radial displacement instantly, keep the sealing clearance unchanged, reduce the friction between the long brush wires 8 and the short brush wires 6 by the installation of the aluminum foil 7, and the aluminum foil 7 enables a certain gap to be formed between the tail end of the long brush wire 8 and the short brush wire 6, so that the transverse pressure difference of airflow at two sides of the long brush wire 8 can be weakened, the hysteresis effect is effectively relieved, the sealing performance is improved, the impact force of fluid on the long brush wire 8 can be reduced by installing the short brush wire 6, and when the long brush wire 8 deforms to cause a gap to be formed inside the long brush wire 8, the gap with a certain area can be shielded, so that the leakage of the fluid can be reduced.

A gap cavity A9 is arranged at the bottom of the bottom plate 301 through the front baffle plate 4 and the long brush wires 8, a gap cavity B10 is arranged at the bottom of the bottom plate 301 through the rear baffle plate 5 and the short brush wires 6, and air inlet holes 11 are formed in the surfaces of the front baffle plate 4 and the rear baffle plate 5.

Specifically, the clearance cavity A9 is arranged to facilitate the long brush wires 8 to move within a distance range, the clearance cavity B10 is arranged to facilitate the short brush wires 6 to move within a distance range, and therefore sufficient free expansion space is guaranteed when the long brush wires 8 and the short brush wires 6 are heated, and the air inlet holes 11 are arranged to facilitate air to pass through the long brush wires 8 and the short brush wires 6, so that air pressure on two sides of the air inlet holes is balanced.

The working principle is as follows: when the brush seal 3 is driven by the seal body 1 to move, airflow enters the clearance cavity A9 under the guide of the front baffle plate 4, the transverse flow of the airflow can be weakened, the hysteresis effect of the long brush wires 8 is reduced, the amplitude of the internal movement of the clearance cavity A9 of the long brush wires 8 can be reduced by the front baffle plate 4, the excessive deformation of the long brush wires 8 along with the movement of the brush seal 3 due to thermal expansion and the like can be avoided, the tail end movement amplitude of the short brush wires 6 can be reduced by the rear baffle plate 5, the excessive deformation of the short brush wires 6 can be avoided, the free ends of the long brush wires 8 are in contact with the surface of a rotor of a gas turbine, the long brush wires 8 have a certain inclination angle, the long brush wires 8 can rebound rapidly after the rotor is subjected to instantaneous large radial displacement, the seal clearance is kept unchanged, when the hysteresis effect occurs after the long brush wires 8 move, and the long brush wires cannot be immediately restored to the original state after the deviation, the short brush wires 6 can reduce the impulsive force of the fluid on the long brush wires 8, and the leakage of the fluid is reduced.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides an industry is brush atmoseal for gas turbine with protective structure, includes seal (1), its characterized in that: the bottom of the sealing body (1) is provided with an air seal tooth (2);

the diapire of seal (1) is equipped with brush seal groove (201), the inside welding in brush seal groove (201) has brush seal (3), bottom plate (301) are installed to the bottom of brush seal (3).

2. The brush type gas seal for industrial gas turbines with a protective structure according to claim 1, characterized in that: the bottom of bottom plate (301) is installed preceding baffle (4), backplate (5) are installed to the bottom of bottom plate (301).

3. The brush type gas seal for industrial gas turbines with a protective structure according to claim 1, characterized in that: the bottom of the bottom plate (301) is provided with long brush wires (8), and the long brush wires (8) are positioned on one side of the front baffle (4).

4. The brush type gas seal for industrial gas turbines with a protective structure according to claim 1, characterized in that: an aluminum foil (7) is arranged at the bottom of the bottom plate (301), and the aluminum foil (7) is positioned on the other side of the long brush filaments (8).

5. The brush type gas seal for industrial gas turbines with a protective structure according to claim 1, characterized in that: the bottom of the bottom plate (301) is provided with the short brush wires (6), and the short brush wires (6) are positioned on one side of the aluminum foil (7).

6. The brush type gas seal for industrial gas turbines with a protective structure according to claim 2, characterized in that: and air inlets (11) are formed in the front baffle (4) and the rear baffle (5) in a penetrating manner.

7. The brush type gas seal for industrial gas turbines with a protective structure according to claim 1, characterized in that: a clearance cavity A (9) is installed at the bottom of the bottom plate (301) through the front baffle (4) and the long brush wires (8), and a clearance cavity B (10) is installed at the bottom of the bottom plate (301) through the rear baffle (5) and the short brush wires (6).