CN112761735A

CN112761735A - Brush seal structure of taking guide plate of high stability

Info

Publication number: CN112761735A
Application number: CN202110100584.XA
Authority: CN
Inventors: 刘育心; 岳本壮; 孔晓治; 李兆鑫; 黄天硕; 陈化
Original assignee: Dalian Maritime University
Current assignee: Dalian Maritime University
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2021-05-07

Abstract

The invention provides a brush type sealing structure with a deflector, which has high stability and comprises: preceding baffle and brush silk, preceding baffle is located brush silk axial incoming flow direction side, preceding baffle dorsad brush silk one side is equipped with the guide plate, the guide plate is followed preceding baffle circumference sets up. The invention discloses a high-stability brush type sealing structure with a guide plate.A guide plate is arranged on a front baffle, and high-speed rotational flow is blocked at the front baffle to change the flow direction, so that the speed of the rotational flow is reduced, the effect of the rotational flow on brush wires is weakened, and the adverse effects of circumferential slippage instability of the brush wires, flutter of the brush wires and the like are reduced.

Description

Brush seal structure of taking guide plate of high stability

Technical Field

The invention relates to the field of dynamic sealing structures, in particular to a high-stability brush type sealing structure with a guide plate.

Background

The dynamic sealing structure mainly controls the leakage amount between a rotating part and a non-rotating part. The brush seal is a contact seal structure, the flexible brush wires can well adapt to thermal expansion and radial runout of the rotor, collision and abrasion between the rotor and the stator are relieved, safety and stability of the rotor are improved, and the brush seal is widely applied to impeller machines such as engines, gas turbines and steam turbines.

However, in the operation of a high-performance engine, the high rotational flow affects the stability of the brush wires, which causes the performance degradation problems such as brush wire vibration and circumferential slippage, and when the rotational flow exceeds the range that the brush wires can bear, a sealing gap is generated, thereby causing the deterioration and even failure of the sealing performance.

Disclosure of Invention

The invention provides a brush type sealing structure with a deflector, which is high in stability and aims to solve the problems.

A high stability brush seal with deflector structure comprising: preceding baffle and brush silk, preceding baffle is located brush silk axial incoming flow direction side, preceding baffle dorsad brush silk one side is equipped with the guide plate, the guide plate is followed preceding baffle circumference sets up.

Further, the front baffle plate comprises a cylindrical circumferential part and an annular radial part, the radial part is perpendicular to the axis of the circumferential part, one end of the guide plate is connected with the circumferential part, and the other end of the guide plate is radially aligned with the inner circle of the radial part.

Further, an axial pressure relief gap is formed between the front baffle and the brush wires.

Further, a first radial included angle exists between the brush wire and the radius of the rotor, and the first radial included angle is 30-60 degrees; and a second radial included angle exists between the guide plate and the radius of the rotor, and the second radial included angle is 10-30 degrees.

Furthermore, the brush wire is provided with a reinforcing wire at one side close to the front baffle, the end part of the reinforcing wire is not in contact with the rotor, and the diameter of the reinforcing wire is larger than that of the brush wire.

Furthermore, the brush wires are arranged on the brush wire ring, and the front baffle and the rear baffle are arranged on two axial sides of the brush wire ring.

The invention discloses a high-stability brush type sealing structure with a guide plate.A guide plate is arranged on a front baffle, and high-speed rotational flow is blocked at the front baffle to change the flow direction, so that the speed of the rotational flow is reduced, the effect of the rotational flow on brush wires is weakened, and the adverse effects of circumferential slippage instability of the brush wires, flutter of the brush wires and the like are reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a schematic view of a brush seal structure with a baffle for high stability according to embodiment 1 of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is an axial schematic view of a high-stability brush seal structure with a deflector in example 1 of the present invention;

fig. 4 is an axial schematic view of a high-stability brush seal structure with a deflector according to embodiment 2 of the present invention;

fig. 5 is a schematic perspective view of a brush seal structure with a baffle in example 1 of the present invention;

FIG. 6 is a comparison of circumferential deformation of brush filaments in a brush seal without a baffle;

FIG. 7 is a comparison graph of circumferential deformation of brush filaments of a high-stability brush seal structure with a deflector in example 2 of the present invention;

FIG. 8 is a graph comparing axial deformation of brush filaments in a brush seal without a baffle;

FIG. 9 is a graph showing a comparison of axial deformation of brush filaments of a brush seal structure with a baffle, which is highly stable in example 2 of the present invention;

FIG. 10 is a gas flow diagram of a brush seal without baffles;

fig. 11 is a gas flow diagram in a brush type sealing structure with a baffle of high stability according to example 2 of the present invention;

FIG. 12 is a graph of air flow velocity in a brush seal configuration without baffles;

fig. 13 is a graph showing the airflow velocity in a brush seal structure with a baffle for high stability according to example 2 of the present invention;

in the figure: 1. a rotor; 2. a baffle; 3. a front baffle; 31. a circumferential portion; 32. a radial portion; 4. a wire brushing ring; 5. a tailgate; 6. brushing wires; 61. reinforcing wires; 7. a wear layer; 8. and (4) relieving the pressure gap.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.

Example 1:

as shown in fig. 1 to 3 and 5, a brush type sealing structure with a baffle of high stability includes: preceding baffle 3 and brush silk 6, preceding baffle 3 is located 6 axial incoming flow direction sides of brush silk, preceding baffle 3 dorsad 6 one side of brush silk are equipped with guide plate 2, guide plate 2 is followed 3 circumference settings of preceding baffle.

Brush silk 6 welding is at brush silk ring 4 internal week, and brush silk 6 tip and rotor 1 contact keep sealed effect, and the place that the rotor contacted with brush silk 6 is equipped with wearing layer 7, increase of service life.

The brush silk ring both sides are equipped with preceding baffle 3 and backplate 4, and preceding baffle is used for protecting, fixed brush silk, improves the stability of brush silk, avoids the brush silk to produce great displacement under the effect of great pressure differential.

On baffle 3 before the baffle is located to guide plate 2, adopt the fusion welding technology evenly to fix in 3 circumferencial directions of baffle in the front, high-speed whirl receives the hindrance in guide plate 2 department, changes the flow direction, makes the speed of whirl reduce, weakens the effect of whirl to the brush silk, reduces adverse effect such as the circumference slippage unstability of brush silk and brush silk shake.

The front baffle 3 comprises a cylindrical circumferential part 31 and an annular radial part 32, the radial part 32 is perpendicular to the axis of the circumferential part 31, one end of the guide plate 2 is connected with the circumferential part 31, and the other end of the guide plate is radially aligned with the inner circle of the radial part 32.

An axial pressure relief gap 8 is formed between the front baffle 3 and the brush filaments 6. The air current gets into pressure relief clearance 8 behind the preceding baffle, and in pressure relief clearance 8, the disturbance appears in the air current, makes the energy of air current appear losing, and velocity of flow and atmospheric pressure descend, and then reduces the influence to the brush silk.

Further, a first radial included angle alpha exists between the brush wire 6 and the radius of the rotor 2, and the first radial included angle alpha is 30-60 degrees; the brush wire arrangement direction and the rotor radius form a certain angle, and the direction of the brush wire arrangement direction is along the rotation direction of the rotor, so that the brush wire arrangement direction can better adapt to the instant radial deformation and the eccentric operation of the rotating shaft.

The side, close to the front baffle 3, of the brush wire 6 is provided with a reinforcing wire 61, the length of the reinforcing wire 61 is shorter than that of the brush wire 6, and the diameter of the reinforcing wire 61 is larger than that of the brush wire 6. The arrangement of the reinforcing wires 61 reduces the influence of high-speed rotational flow on the front row of brush wires, and improves the stability of the brush wires. The diameter of the front row of brush wires is increased, the length of the front row of brush wires is reduced, the rigidity of the front row of brush wires can be improved, the closing effect is increased, and the stability of brush type sealing is improved.

Example 2:

as shown in fig. 4, this embodiment is different from embodiment 1 in that a second radial included angle β exists between the baffle plate 2 and the radius of the rotor 2, where β in this embodiment is 20 ° and α is 40 °.

In fig. 6-9, the X-axis is the circumferential position, the Y-axis is the axial position, and the Z-axis is the radial position.

Fig. 6 is a comparison graph of circumferential displacement of the brush filaments when the guide plate is not arranged, and fig. 8 is a comparison graph of axial displacement of the brush filaments when the guide plate is not arranged, wherein darker color is the position of the brush filaments when the brush filaments are in operation, and lighter color is the position of the brush filaments when the brush filaments are not in operation. As can be seen from the figure, the deformation of the brush filaments is large, particularly the deformation of the brush filaments in the front row is large, and the radial sealing clearance is generated due to the excessive circumferential sliding deformation.

FIG. 7 is a comparison graph of circumferential displacement of brush filaments in the present embodiment, and FIG. 9 is a comparison graph of axial displacement of brush filaments in the present embodiment, where darker colors are positions of the brush filaments in operation and lighter colors are positions of the brush filaments in non-operation. As can be seen from the figure, the displacement of the brush wires is small, and compared with the displacement and the deformation degree of the front row of brush wires, the displacement and the deformation degree of the front row of brush wires are greatly improved.

As shown in figures 10-13, the airflow is disturbed by the guide plate, and regular rotational flow is difficult to form, so that the flow velocity of the airflow is influenced, and the influence on the brush wires is reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A brush seal structure with deflector of high stability, its characterized in that includes: preceding baffle (3) and brush silk (6), preceding baffle (3) are located brush silk (6) axial incoming flow direction side, preceding baffle (3) dorsad brush silk (6) one side is equipped with guide plate (2), guide plate (2) are followed preceding baffle (3) circumference sets up.

2. A brush seal structure with a deflector of high stability according to claim 1, wherein the front baffle (3) comprises a cylindrical circumferential portion (31) and an annular radial portion (32), the radial portion (32) is perpendicular to an axis of the circumferential portion (31), and the deflector (2) has one end connected to the circumferential portion (31) and the other end radially aligned with an inner circle of the radial portion (32).

3. A high stability brush seal construction with deflector according to claim 1 characterized in that between the front baffle (3) and the brush filaments (6) there is an axial pressure relief gap (8).

4. A high stability brush seal structure with deflector according to claim 1, characterized in that there is a first radial angle between the brush filaments (6) and the radius of the rotor (1), said first radial angle being 30 ° -60 °; a second radial included angle is formed between the guide plate (2) and the radius of the rotor (1), and the second radial included angle is 10-30 degrees.

5. A high-stability brush seal structure with deflector according to claim 1, wherein the brush wire (6) is provided with a reinforcing wire (61) at a side close to the front baffle (3), the end of the reinforcing wire (61) is not in contact with the rotor (1), and the diameter of the reinforcing wire (61) is larger than that of the brush wire (6).

6. A highly stable brush seal structure with deflector according to claim 1, wherein the brush wires (6) are provided on a brush wire ring (4), and the front baffle (3) and the rear baffle (4) are provided on both axial sides of the brush wire ring (4).