KR20150144627A - Brush seal assembly - Google Patents

Abstract

The present invention relates to a brush seal assembly to seal a gap between a diaphragm and a rotor of a turbine. According to one embodiment of the present invention, the brush seal assembly comprises: a brush configured to have one end inserted into one side of a diaphragm and the other end protruding toward the rotor; a support strip configured to support one side of the brush; and a back plate configured to support one side of the support strip.

Description

[0001] Brush seal assembly [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush seal assembly, and more particularly, to a brush seal assembly for sealing a clearance between a rotor and a fixed wing of a turbine.

A turbine is a power generating device for converting heat energy of a fluid such as gas or steam into rotational force as mechanical energy and includes a rotor having a plurality of buckets for axial rotation by a fluid, And a casing provided with a plurality of diaphragms.

Here, the gas turbine comprises a compressor, a combustor and a turbine. The external air is sucked and compressed by the rotation of the compressor, and then sent to the combustor, where combustion is performed by mixing the compressed air and the fuel in the combustor. The high-temperature and high-pressure gas generated in the combustor passes through the turbine and rotates the rotor of the turbine to drive the generator.

In the case of a steam turbine, a high-pressure turbine, a medium-pressure turbine, and a low-pressure turbine are connected in series or parallel to rotate the rotor. In the case of a series structure, a high-pressure turbine, a medium-pressure turbine, and a low-

In the steam turbine, each of the turbines has a fixed wing and a rotating wing around a rotor inside the casing, and the steam is passed through the fixed wing and the rotating wing, and the rotor is rotated to drive the generator.

At this time, since the gas turbine and the steam turbine have a structure in which the rotating body (for example, a rotor) relatively rotates with respect to the fixed body (for example, fixed wing), leakage of high temperature and high pressure fluid occurs in the gap between the fixed body and the rotating body, Such fluid leakage is one of the causes of energy efficiency degradation due to power loss.

Therefore, efforts have been continuously made to reduce the leakage of fluid generated in the gap between the rotating body and the fixed body.

In order to minimize fluid leakage, the gap between the fixed body and the rotating body should be minimized, but there are various limitations in narrowing the gap.

For example, when the clearance is too narrow, the rotating body and the fixing body may interfere with each other during the rotation of the rotating body, causing vibration due to rubbing, which causes serious damage to the apparatus.

On the other hand, the steam turbine expands or shrinks from several millimeters to several tens mm depending on the position during operation and start-stop because the high-temperature steam flowing from the boiler exerts heat on the rotor and the fixture. At this time, the characteristics of the rotating body and the fixed body differ not only not only differently, but also the direction of expansion depending on the structure of the turbine, so that the rotating body and the fixed body may interfere with each other during operation and rubbing may occur.

Conventionally, a labyrinth seal has been used for sealing. In recent years, a brush seal having a brush coupled to a labyrinth seal is applied to eliminate the gap between the fixture and the rotating body, A technique of sealing them in the form of contacting each other has been developed.

1 shows an example in which a labyrinth seal 1 and a brush seal 2 are applied to a gap between a stationary body and a rotating body of a steam turbine. The stationary body includes a casing 3 and a fixed blade 4, The rotating body includes a rotor (5) and a rotor blade (6).

The fixed blade 4 is fixedly coupled to the casing 3 and is provided adjacent to the rotor blade 6 and the rotor blade 6 is axially rotated integrally with the rotor 5 while being adjacent to the fixed blade 4.

At this time, sealing is required for the gap between the fixed blade 4 and the rotor blade 6 and the gap between the fixed blade 4 and the rotor 5.

FIG. 2 is a brush seal disclosed in US Pat. No. 6,790,001 (Patent Document 1). The seal ring 40 is provided with a labyrinth seal 50 and a brush seal 42 on the bottom surface thereof. The end portion 52 of the rotor 14 is in contact with the outer peripheral surface of the rotor 14.

The brush chamber 42 includes a brush 44 and a pair of plates 46 and 48 disposed on both sides of the brush 44 before and after the brush 44 to support the brush 44. The plates 46, The ends of the plates 46 and 48 are spaced from the outer circumferential surface of the rotor 14 in order to prevent the generation of heat when the rotor 14 and the rotor 14 contact each other.

At this time, if the distance between the end portions of the plates 46 and 48 and the rotor 14 is large, the amount of fluid leakage increases, and if the gap is narrow, rubbing of the plates 46 and 48 and the rotor 14 There is a problem that heat and vibration are generated.

US6790001B2 (registered on September 14, 2004)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a brush seal assembly capable of reducing heat generation and wear due to rubbing with a rotor.

Another object of the present invention is to provide a brush seal assembly capable of increasing turbine efficiency due to an improvement in sealing effect.

Another object of the present invention is to provide a brush seal assembly which is simple in construction and easy to assemble and is cost competitive.

According to a preferred embodiment of the present invention, there is provided a brush seal assembly for sealing a clearance between a fixed blade and a rotor of a turbine, the brush seal assembly comprising: a brush having one end inserted into the fixed blade and the other end protruding in the rotor direction; A support strip for supporting one side of the brush; And a back plate supporting one side of the support strip.

The apparatus may further include a back plate for supporting the other side of the brush.

One end of the brush and one end of the support strip are welded and fixed to the middle portion of the brush insertion groove, and both sides of the brush and the support strip are connected to the back plate Respectively.

In addition, at least one bent portion may be formed on the supporting strip.

At this time, a pressure pocket is formed between the bent portion and the brush.

The support strip includes a support portion for supporting one side of the brush and a bent portion bent at one end of the support portion so as to surround one end of the brush.

The support strip may further include an extension portion extending from one end of the bent portion to cover a portion of the other side surface of the brush.

At this time, at least one bend portion may be formed on the support portion, and a pressure pocket is formed between the bend portion and the brush.

In addition, an anchoring member for pressingly supporting the extension portion against the brush may be provided on the other side of the brush.

At this time, a brush insertion groove into which the brush is inserted is formed at one side of the fixed wing, and an anchoring member insertion groove into which the anchoring member is inserted is formed at one side of the brush insertion groove.

At this time, it is preferable that the anchoring member insertion groove is formed stepwise from one side of the brush insertion groove toward the rotor.

On the other hand, the rotor-side end of the support strip is disposed further away from the other end of the brush in the radial direction of the rotor.

Further, the rotor-side end of the back plate is disposed further radially outward of the rotor than the rotor-side end of the support strip.

According to the brush seal assembly of the embodiment of the present invention, since the thin support strip is supported on one side of the brush, heat and abrasion due to rubbing with the rotor are reduced as compared with the prior art.

Accordingly, the gap between the support strip supporting the brush and the rotor can be reduced to minimize the leakage of the fluid, thereby improving the sealing effect and the turbine efficiency.

In addition, it is possible to provide a brush seal assembly which is simple in structure, easy to assemble, and low in cost.

The first support strip extends from the lower end to the upper end of the support strip and is formed of a material having elastic restoring force. The second support strip extending from the first support strip to the upper end is formed of a material different from the first support strip do.

The supporting strip is divided into a first supporting strip, which is opposed to the brush with respect to the longitudinal direction, and a second supporting strip which is opposed to the back plate, and is formed of a material different from the first supporting strip.

The support strip extends from the lower end to the upper end of the first support strip, and the first support strip is divided into a material having an elastic restoring force and the other second support strip is formed of a material different from the first support strip.

And the back plate opposed to the support strip having the pressure pockets formed therein is kept in close contact with the rounded outer circumferential surface of the pressure pocket.

The pressure pockets are formed with different radii along the longitudinal direction of the support strip.

The anchoring member is formed in the shape of a letter, and is tightly fitted into the anchoring member insertion groove in a state in which one surface is in close contact with the outer peripheral surface of the extension extending from the support strip and the other surface is in tight contact with the anchoring member insertion groove.

1 is a schematic view showing an example in which a labyrinth seal and a brush seal are applied to a gap between a fixed body and a rotating body of a steam turbine.
2 is a schematic view showing an example of a conventional brush seal assembly.
3 is a schematic view of a brush seal assembly according to a first embodiment of the present invention.
4 is a use state diagram of the brush seal assembly according to the first embodiment of the present invention.
5 is another use state view of the brush seal assembly according to the first embodiment of the present invention.
6 is a schematic view of a brush seal assembly according to a second embodiment of the present invention.
7 is a schematic view of a brush seal assembly according to a third embodiment of the present invention.
8 is a schematic view of a brush seal assembly according to a fourth embodiment of the present invention.
9-11 illustrate another embodiment of a support strip according to the first embodiment of the present invention.
12-13 illustrate another embodiment of a support strip according to a second embodiment of the present invention.
14 is a view showing another embodiment of an anchoring member according to the fourth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood that the present invention is not intended to be limited to the specific embodiments but includes all changes, equivalents, and alternatives included in the spirit and scope of the present invention.

In describing the present invention, the terms first, second, etc. may be used to describe various components, but the components may not be limited by the terms. The terms are only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being connected or connected to another element, it may be directly connected or connected to the other element, but it may be understood that other elements may be present in between . On the other hand, when it is mentioned that an element is directly connected to or directly connected to another element, it can be understood that there is no other element in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions may include plural expressions unless the context clearly dictates otherwise.

It is to be understood that the term " comprising, " or " comprising " as used herein is intended to specify the presence of stated features, integers, But do not preclude the presence or addition of steps, operations, elements, components, or combinations thereof.

Also, unless otherwise defined, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs . Terms such as those defined in commonly used dictionaries can be interpreted as having a meaning consistent with the meaning in the context of the related art and, unless explicitly defined herein, are interpreted in an ideal or overly formal sense .

In addition, the following embodiments are provided so as to explain the invention more clearly to those skilled in the art. The shapes and sizes of the elements in the drawings may be exaggerated for clarity.

3 is a schematic view of a brush seal assembly according to a first embodiment of the present invention.

1, a thread mounting groove 7 is formed on one surface of a fixed wing 4 opposite to a rotor 5, and a sealing body 8 is coupled to the thread mounting groove 7. As shown in FIG.

The sealing body 8 is in the form of a ring which surrounds the outside of the rotor 5 as a whole and includes a coupling portion 9 to be inserted into and coupled to the thread mounting groove 7, And a body portion 12 having a width expanded in the direction of the outer peripheral surface of the body portion 5.

At this time, the engaging portion 9 of the sealing body 8 has an insertion portion 10 to be inserted into the thread insertion groove 7, a thread insertion groove 7 having a width expanded from one side of the insertion portion 10, And a latching portion 11 which is engaged with the step 7a.

The body portion 12 of the sealing body 8 is formed so that the width thereof is extended on the opposite side of the insertion portion 10 so as to face the engaging portion 11 and a plurality of labyrinth seals 1 And is protruded and formed.

A mounting groove 13 is formed at the bottom of the body portion 12 and the brush seal assembly 100 according to the first embodiment of the present invention is mounted on the mounting groove 13 at one end thereof.

3, the brush seal assembly 100 according to the first embodiment of the present invention includes a brush 110, a support strip 120 for supporting one side of the brush 110, a support strip 120, And a pair of back plates 130 and 140 for supporting one side of the brush 110 and the other side of the brush 110.

The brush 110 includes a plurality of bristles, and the standard such as the thickness of the bristles forming the brush 110 can be appropriately selected as needed.

One end of the brush 110 is inserted into the mounting groove 13 and is welded and fixed by the weld 150. The other end of the brush 110 extends in the direction of the outer surface of the rotor 5 and the end of the brush 110 contacts the outer peripheral surface of the rotor 5. Thus, both sides in the axial direction of the rotor 5 are sealed by the brushes 110 with respect to the brushes 110.

More specifically, the pressure PH on the right side of the brush 110 in the drawing is relatively higher than the pressure PL on the left side, and the brush 110 seals the fluid flowing from the high pressure area to the low pressure area.

At this time, the support strip 120 is closely attached to one surface 111 of the brush 110, that is, one side 111 of the low pressure area. One end of the support strip 120 is inserted into the mounting groove 13 and fixed together with the brush 110. The support strip 120 serves to support the deformation of the brush 110 due to the pressure difference on both sides of the brush 110.

The support strip 120 may be in the form of a ring of thin plate, and preferably has elasticity. And may be made of a synthetic resin material relatively strong against heat, and preferably made of a metal material having elasticity. At this time, the support strip 120 is welded together with the brush 110 to the middle portion of the mounting groove 13 by the welding portion 150.

 The other end extending in the direction of the rotor 5 of the support strip 120 is located inside the other end of the brush 110. As shown in FIG. 3, the end of the support strip 120 is positioned at a radial distance from the outer circumferential surface of the rotor 5, as compared to the end of the brush 110, to prevent rubbing of the support strip 120 and the rotor 5. [ So that they are positioned further apart from the direction.

However, since the support strip 120 is in the form of a thin plate having elasticity, it is easily elastically deformed upon contact with the rotor 5. Therefore, compared to the plates 46 and 48 (see FIG. 2) for supporting both sides of the conventional brush 110, there is an effect that heat generation and abrasion due to rubbing are reduced, and the gap with the rotor 5 is reduced The sealing efficiency can be increased.

On the other hand, a pair of back plates 130 and 140 are provided on both sides of the brush 110 and the support strip 120 in the mounting groove 13. The first back plate 130, which is press-fitted into one side of the mounting groove 13, supports one side of the supporting strip 120. The second back plate 140 press-fitted into the other side of the mounting groove 13 supports the other side of the brush 110, that is,

Here, the first back plate 130 and the second back plate 140 serve to support the brush 110 and the support strip 120 against fluid flow. The first back plate 130 disposed in the low pressure side area is in contact with the support strip opposing surface 131 on one side of the support strip 120. The second back plate 140 disposed on the high pressure side region has a step 142 formed at the lower end of the brush facing surface 141 so that a predetermined clearance 142 is formed between the brush 110 and the second back plate 140 143 are formed.

At this time, the rotor 5 relative to the rotor 5 of the back plates 130 and 140 (the lower end in the drawing) is positioned inside the rotor 5 at the opposite ends (lower end in the drawing) of the support strip 120. This is to prevent the back plates 130 and 140 and the rotor 5 from rubbing against each other so that the end portions of the back plates 130 and 140 are further radially outwardly spaced from the outer circumferential surface of the rotor 5 .

According to the first embodiment of the present invention, the brush 110 is firmly supported by the back plates 130 and 140 and the support strip 120 while the support strip 120 ) Is elastically deformed, the effect of reducing heat generation and abrasion can be seen as compared with the conventional art.

4 is a use state diagram of the brush seal assembly according to the first embodiment of the present invention.

4, the brush seal assembly 100 according to the first embodiment of the present invention is mounted at the center of the bottom surface of the sealing body 8, while the sealing body 8 A plurality of yarn strips 50 'may be provided apart from each other along a width direction of the yarn strips 50'.

At this time, one end of the thread strip 50 'is inserted and fixed in the thread thread mounting groove 13', and the other end is extended in the direction of the rotor 5 (see FIG. 1). The yarn strip 50 'has a J-shape as a whole and includes a bent portion 51' inserted into the yarn strip mounting groove 13 'and bent along the wall surface of the yarn strip mounting groove 13' And an extension portion 52 'extending from one end of the portion 51' in the direction of the rotor 5.

In this case, since the structure is simple as compared with the example of forming the conventional labyrinth seal 1 (see Fig. 1), sealing between the stationary body and the rotating body can be realized at a lower cost.

Meanwhile, the brush seal assembly 100 according to the first embodiment of the present invention and the conventional labyrinth seal 1 may be applied together. 5 is a state diagram showing another example in which the brush seal assembly 100 according to the first embodiment of the present invention and the conventional labyrinth seal 1 are applied together.

4, a plurality of the brush seal assemblies may be used together with the seal strip 50 'spaced apart from each other along the width direction of the sealing body 8, Of course, can be used together with a conventional labyrinth seal 1 as shown in Fig.

6 is a schematic view of a brush seal assembly according to a second embodiment of the present invention.

The brush seal assembly 100a according to the second embodiment of the present invention is similar in basic structure to the brush seal assembly 100 according to the first embodiment described above with reference to FIG. There is a difference in that at least one bent portion 121 is formed.

Therefore, the same components as those of the first embodiment described above are denoted by the same reference numerals, and a duplicate description will be omitted.

According to the second embodiment of the present invention, at least one bent portion 121 is formed on the support strip 120. [ At this time, a step portion 132 for receiving the bent portion 121 is formed on the support strip facing surface 131 of the first back plate 130 supporting one side of the support strip 120.

In the case of the embodiment shown in FIG. 6, the bent portion 121 is formed in an arc-shaped cross-sectional shape, but the present invention is not limited thereto, and may be formed in a semicircular or polygonal cross-sectional shape such as a triangle or a rectangle.

In addition, the plurality of bends 121 according to the second embodiment of the present invention may be spaced apart from each other or may be formed continuously in a wave form. That is, the specifications such as the number of bends 121, the height of protrusion, and the distance between them can be appropriately selected as needed.

Between each bend 121 and the brush 110, a pressure pocket 122, which is a space through which fluid of a high pressure range flows, is formed.

The pressure pockets 122 serve to support one surface 111 of the brush 110 facing the low pressure area by the pressure of the high pressure fluid introduced into the pressure pockets 122, To the pressure pocket 122 through the gap between the bristles constituting the bristles.

In addition, the stiffness of the support strip 120 can be improved by the bent portion 121 according to the second embodiment of the present invention.

7 is a schematic view of a brush seal assembly according to a third embodiment of the present invention.

7, the brush seal assembly 200 according to the third embodiment of the present invention includes a brush 210, a support strip 220 for supporting one side of the brush 210, a support strip 220 A back plate 230 for supporting one side of the brush 210 and an anchoring member 240 for supporting the other side of the brush 210.

The brush 210 includes a plurality of bristles, and the specifications such as the number and thickness of the bristles making up the brush 210 can be appropriately selected as needed.

One end of the brush 210 is inserted into the brush insertion groove 13a and the other end of the brush 210 extends in the direction of the outer circumferential surface of the rotor 5 (refer to Fig. 1), and an end thereof is in contact with the outer peripheral surface of the rotor 5. Thus, both sides in the axial direction of the rotor 5 are sealed by the brushes 210 with respect to the brushes 210.

More specifically, the pressure PH on the right side of the brush 210 in the drawing is relatively higher than the pressure PL on the left side, and the brush 210 seals the fluid flowing from the high pressure area to the low pressure area.

The support strip 220 is provided on one side of the brush 210 so as to be in close contact with the low pressure area side 211. The support strip 220 is disposed between the brush 210 and the brush 210, As shown in FIG.

The support strip 220 is in the form of a ring of thin plates with a "J" shaped cross section, and may be made of a material that is relatively strong but resilient to heat, such as metal, as well as synthetic resin. In addition, the support strip 220 of this embodiment can also be used as the seal strip 50 '(see FIG. 4) described with reference to FIG.

The supporting strip 220 according to the third embodiment of the present invention includes a support 221 for supporting one side of the brush 210 and a support 221 for supporting one end of the brush 210 in a circular arc shape And a bent portion 222 bent in a rounded shape.

In order to prevent the separation of the support strip 220, it is preferable that an extended portion 223 is formed by extending a predetermined length from one end of the bent portion 222. That is, one end of the support strip 220 is bent so as to surround one end of the brush 210, so that the extension portion 223 of the support strip 220 covers a part of the other side of the brush 210.

At this time, the other end of the support strip 220 is located inside the other end of the brush 210. As shown in FIG. 7, the end of the support strip 220 is positioned above the outer circumferential surface of the rotor 5, as compared to the end of the brush 210, It is located at a further spaced point.

However, since the support strip 220 has a thin plate shape and elasticity, the support strip 220 has an effect of reducing heat generation and wear due to rubbing with the rotor 5, and is advantageous in comparison with the conventional plates 46 and 48 The gap with the rotor 5 can be reduced and the sealing efficiency can be increased.

The brush 210 and the support strip 220 are connected to the body portion 12 of the sealing body 8 (see FIG. 1) with one end of the brush 210 being surrounded by the bent portion 222 of the support strip 220, 1) is inserted into the brush insertion groove 13a formed at the center of the bottom surface.

Further, a back plate 230 is inserted into the brush insertion groove 13a to support one side of the support strip 220. At this time, in order to prevent rubbing of the back plate 230 and the rotor 5, it is preferable that the opposite end of the rotor 5 of the back plate 230 is located inside the rotor 5 of the support strip 220 . In other words, the end of the back plate 230 is positioned farther radially outward from the outer peripheral surface of the rotor 5 than the end of the support strip 220.

The anchoring member 240 is pressed into the anchoring member insertion groove 13b on one side of the brush insertion groove 13a in order to prevent the brush 210 from separating from the support strip 220 and the back plate 230. [

The anchoring member 240 presses the extension portion 223 of the support strip 220 toward the brush 210 so that the brush 210 and the support strip 220 are pressed toward the back plate 230 The brush 210, the support strip 220 and the back plate 230 are firmly fixed in the brush insertion groove 13a.

As an example, the anchoring member 240 may be formed of a ring-shaped elastic body, and may extend in the outer circumferential direction, so that a plurality of strands may be twisted in the longitudinal direction.

The anchoring member insertion groove 13b is formed in a stepped shape in the direction of the rotor 5 from one side of the brush insertion groove 13a so that the anchoring member 240 can press the extension portion 223 of the support strip 220 .

For example, the bottom surface of the anchoring member insertion groove 13b is protruded in the direction of the rotor 5 from one side of the bottom surface of the brush insertion groove 13a.

The bottom surface of the anchoring member insertion groove 13b is formed corresponding to the boundary between the bent portion 222 and the extending portion 223 of the support strip 220 and thus the bottom surface of the anchoring member insertion groove 13b is press- The anchoring member 240 is used to intensively press the extension portion 223 of the support strip 220 as shown in FIG. 7 so that the brush 210, the support strip 220, and the back plate 230 are inserted into the brush insertion groove 13a.

According to the third embodiment of the present invention, the support portion 221 of the support strip 220 supports one side 211 of the brush 210 facing the low-pressure region while the support portion 221 of the support strip 220 supports the low- The deformation of the brush 210 due to the pressure difference between both sides of the brush 210 and the leakage of the fluid due to the deformation of the brush 210 can be reduced.

The brush seal assembly 200 according to the third embodiment of the present invention is characterized in that the brush 210, the support strip 220 and the back plate 230 are inserted into the brush insertion groove 13a of the sealing body 8, The anchoring member 240 is pressed into the anchoring member insertion groove 13b and the brush 210 and the support strip 220 and the back plate 230 are pressed and supported by the anchoring member 240 to complete the installation. Therefore, it is easy to assemble as a simple structure, and the manufacturing and assembling cost is reduced.

8 is a schematic view of a brush seal assembly according to a fourth embodiment of the present invention.

The brush seal assembly 200a according to the fourth embodiment of the present invention is similar in basic structure to the brush seal assembly 200 according to the third embodiment described above with reference to FIG. There is a difference in that at least one bent portion 224 is formed.

Therefore, the same reference numerals are assigned to the same components having the same functions as those of the third embodiment described above, and a duplicate description will be omitted below.

According to the fourth embodiment of the present invention, at least one bend section 224 is formed in the support section 221 of the support strip 220. At this time, the support strip facing surface 231 of the back plate 230 supporting one side of the support strip 220 is formed with a step portion 232 for receiving the bent portion 224.

In the embodiment shown in FIG. 8, the bent portion 224 is formed in an arc-shaped cross-sectional shape, but the present invention is not limited thereto. The bent portion 224 may have a semi-circular shape or a polygonal cross-sectional shape such as a triangle or a rectangle.

In addition, the plurality of bends 224 according to the fourth embodiment of the present invention may be spaced apart from each other or may be formed continuously in a wave form. That is, the specifications such as the number of the bent portions 224, the height of the protrusion, the distance between them, and the like can be appropriately selected as needed.

At this time, the stiffness of the support strip 220 is improved by the bent portion 224 formed in the support portion 221.

Between each bend section 224 and the brush 210, a pressure pocket 225 into which fluid of a high pressure region flows is formed.

The pressure pockets 225 form a high pressure by the fluid in the high pressure region flowing through the gap between the bristles constituting the brush 210 and support the one surface 211 of the brush 210 facing the low pressure region do.

In other words, according to the brush seal assembly 200a of the fourth embodiment of the present invention, the deformation of the brush 210 and the deformation of the brush 210 can be suppressed by the pressure pocket 225 supporting the one surface 211 of the brush 210, The leakage of the fluid can be reduced.

A support strut according to a first embodiment of the present invention will be described with reference to the drawings.

9, the support strip 120 includes a first support strip 121 extending from the lower end to an upper end of the first support strip 121 for elastic deformation according to the load applied through the rotor 5, And the second supporting strip 122 extending from the first supporting strip 121 to the upper end is formed of a material different from that of the first supporting strip 121.

It is noted that the first support strip 121 extends from the bottom end to the top with a predetermined length as shown in the enlarged view and is not necessarily limited to the length shown in the enlarged view.

The second support strip 122 is made of a material different from that of the first support strip 121, for example, steel or an elastic restoring force. At this time, since the elastic restoring force of the first support strip 122 is different from that of the first support strip 122, it is possible to prevent the support force against the brush 110 from being lowered and to elastically deform the lower end portion in contact with the rotor 5 more easily So that heat generation and wear due to rubbing can be reduced.

Referring to FIG. 10, the support strip 120 is divided into a first support strip 121, which is opposed to the brush 120, and a second support strip 121, The support strip 122 is formed of a material different from that of the first support strip 121.

In this embodiment, the first and second support strips 121 and 122 are each divided in the direction of the second support strip 121, which is separated from the second support strip 122 as shown in the enlarged view, The thickness is made thin.

In this case, when the rotor 5 and the support strip 120 come into contact with each other and a load is applied in the longitudinal direction, the supporting force 110 in the longitudinal direction of the brush 110 is improved.

In addition, when the fluid is moved from PH to PL, the first support strip 121 adhered to the brush 110 can be more easily elastically deformed in the longitudinal direction to minimize the concentration of stress applied to the brush 110.

11, the support strip 120 is divided into a material having an elastic restoring force by the first support strip 121 extending from the lower end to the upper end of the first support strip 121 and facing the brush 110, The support strips 122 are formed of a material different from the first support strips 121.

In this case, when the support strip 120 in close contact with the brush 110 is irregularly deformed in the longitudinal direction or the transverse direction (lateral direction), the support force against the brush 110 is minimized and the occurrence of deformation is minimized. Can be improved.

A support strip according to a second embodiment of the present invention will be described with reference to the drawings.

12, the support strips 120 are formed at different radii along the longitudinal direction of the support strips 120, such that the pressure pockets 122 formed on the opposite sides of the brushes 110 are formed. For example, the pressure pockets formed at the lower end and the pressure pockets formed at the center and the upper side with respect to the longitudinal direction are formed to have different radii.

For example, when the radius of the pressure pocket formed at the lower end is relatively large, the amount of the fluid flowing into the increased radius is increased, so that the occurrence of vibration due to the pressure fluctuation directly transmitted to the lower end of the brush 110 can be minimized .

Referring to FIG. 13, the back plate 130 is formed in such a manner that the opposed surface opposed to the support strip 120 is kept in close contact with the rounded outer circumferential surface of the pressure pocket 122.

In this case, the state in which the back plate 130 is in close contact with the support strip 120 is more stably maintained, so that the high pressure fluid can be stably supported when the fluid is moved to the back plate 130 via the brush 110 , It is possible to relatively minimize the occurrence of vibration due to pressure fluctuations.

Referring to FIG. 14, the anchoring member 240 is formed in the shape of a letter, and one side of the extension 223 extending from the support strip 220 is in close contact with the other side of the anchoring member insertion groove 13b. And is tightly fitted.

Since the anchoring member 240 is formed in a shape corresponding to the shape of the anchoring member insertion groove 13b, it is possible to stably hold the support strip 220 with no space after the insertion, Keep the stationary state constant throughout.

This prevents malfunction of the brush 110 due to the rubbing shape, thereby stably maintaining the sealed state.

100, 100a, 200, 200a: Brush seal assembly
110,210: Brush
120, 220: support strip
130, 140, 230:
240: anchoring member
121,224:
122,225: pressure pocket

Claims (20)

A brush seal assembly for sealing a clearance between a rotor and a fixed wing of a turbine,
A brush having one end inserted into one side of the fixed wing and the other end protruding in the direction of the rotor;
A support strip for supporting one side of the brush; And
And a back plate supporting one side of the support strip.
The method according to claim 1,
And a back plate for supporting the other side of the brush.
The method of claim 2,
Wherein one end of the brush and one end of the support strip are welded and fixed to a middle portion of the brush insertion groove, and both sides of the brush and the support strip are respectively fixed by the back plate Wherein the brush seal assembly is supported by the brush seal assembly.
The method according to claim 1,
Wherein at least one bend is formed in the support strip.
The method of claim 4,
Wherein a pressure pocket is formed between the bend and the brush.
[2] The apparatus according to claim 1,
And a bending part bent at one end of the supporting part so as to surround one end of the brush.
7. The apparatus of claim 6,
And an extension extending from one end of the bent portion to cover a portion of the other side of the brush.
The method of claim 6,
Wherein at least one bent portion is formed on the support portion.
The method of claim 8,
Wherein a pressure pocket is formed between the bend and the brush.
The method of claim 7,
And an anchoring member for pressingly supporting the extension portion against the brush is disposed on the other side of the brush.
The method of claim 10,
Wherein a brush insertion groove into which the brush is inserted is formed on one side of the fixed wick, and an anchoring member insertion groove into which the anchoring member is inserted is formed on one side of the brush insertion groove.
The method of claim 11,
Wherein the anchoring member insertion groove is formed stepwise from one side of the brush insertion groove toward the rotor.
The method according to any one of claims 1 to 12,
Wherein the rotor-side end of the support strip is disposed more radially outwardly of the rotor than the other end of the brush.
14. The method of claim 13,
Wherein the rotor-side end of the back plate is disposed further radially outwardly of the rotor than the rotor-side end of the support strip.
The method according to claim 1,
The support strip,
The first support strip extending from the lower end to the upper end of the first support strip is formed of a material having elastic restoring force and the second support strip extending from the first support strip to the upper end is formed of a brush seal assembly formed of a material different from that of the first support strip, . The method according to claim 1,
The support strip,
Wherein the first support strip is formed of a material having an elastic restoring force and the second support strip is opposed to the back plate, the first support strip being opposed to the brush with respect to the longitudinal direction, the first support strip being made of a material different from the first support strip. The method according to claim 1,
The support strip,
The first support strip extending from the lower end to the upper end of the first support strip is divided into a material having an elastic restoring force and the other second support strip is formed of a material different from the first support strip. The method of claim 9,
The pressure pockets may include,
A brush seal assembly formed with different radii along the length of the support strip. The method according to any one of claims 1 to 18,
The back plate, which is opposed to the support strip formed with the pressure pockets,
And a state in which the pressure pocket is kept in close contact with the rounded outer circumferential surface of the pressure pocket is maintained. The method of claim 10,
The anchoring member
Wherein the one side is in close contact with the outer circumferential surface of the extended portion extending from the support strip and the other side is fitted into the anchoring member insertion groove in a completely close contact state.

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