KR20240078998A - Brush Seal Assembly - Google Patents

Abstract

A brush seal assembly is disclosed. The brush seal assembly includes: a seal housing located in a fluid flow space between a fixed body and a rotating body, formed along a circumferential direction of the rotating body, and having a fastening groove open toward the rotating body; And it may include a brush seal portion inserted into the insertion groove. The brush seal portion includes a core wire extending along the circumferential direction of the rotating body; a brush thread surrounding the core wire and having one end and the other end extending toward the rotating body; a clamping tube disposed to surround at least a portion of the circumference of the core wire with the brush thread interposed therebetween, to press the brush thread toward the core wire; and a plate that covers the clamping tube, presses one side and the other side of the clamping tube, and exposes one end and the other end of the brush seal toward the rotating body.

Description

Brush Seal Assembly

The present invention relates to a brush seal assembly, and more specifically, to a brush seal assembly used to seal the gap between a turbine fixture (or stator) and a rotating body (or rotor).

In general, a turbine is a power generating device that converts the thermal energy of a fluid, such as gas or steam, into rotational force, which is mechanical energy. It consists of a rotor that includes a plurality of rotary blades to be rotated by the fluid. , which is installed surrounding the circumference of the rotor and includes a casing equipped with a plurality of fixed wings (diaphram).

Here, the gas turbine is composed of a compressor, a combustor, and a turbine. External air is sucked in and compressed by the rotation of the compressor, and then sent to the combustor, and combustion occurs by mixing compressed air and fuel in the combustor. The high-temperature and high-pressure gas generated from the combustor passes through the turbine and rotates the turbine's rotor to drive the generator.

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

In a steam turbine, each turbine has fixed blades and rotary blades centered on a rotor inside the casing, and as steam passes through the fixed blades and rotary blades, the rotor can rotate to drive a generator.

At this time, gas turbines and steam turbines have a structure in which the rotating body (rotor) rotates relative to the fixed body (fixed blade), so leakage of high-temperature and high-pressure fluid occurs through the gap between the fixed body and the rotating body. is one of the causes of reduced energy efficiency due to power loss, and efforts are continuously being made to reduce fluid leakage occurring in the gap between the rotating body and the stationary body.

In order to minimize fluid leakage, the gap between the stationary body and the rotating body must first be minimized, but narrowing the gap also poses various limitations. For example, if the gap is too narrow, when the rotating body rotates, the rotating body and the stationary body interfere with each other, causing vibration due to rubbing, which causes serious damage to the turbine.

Meanwhile, a steam turbine expands or contracts from a few millimeters to several tens of millimeters depending on its location during operation and start/stop because high-temperature steam flowing in from the boiler applies heat to the rotating body and stationary body. At this time, not only do the rotating body and the stationary body expand differentially due to different material properties, but also the direction of expansion is different depending on the structure of the turbine, so the rotating body and the stationary body may interfere during operation, resulting in rubbing.

In the past, sealing was typically done using a labyrinth seal, and recently, a brush seal combining a brush with the labyrinth seal was applied to eliminate the gap between the fixed body and the rotating body and provide flexible sealing. Technology for sealing in a form of contact with each other is being developed.

As an example, Figure 1 shows an example in which a labyrinth seal (1) and a brush seal (2) are applied to the gap between the fixed body and the rotating body of a steam turbine. The stationary body includes a casing (3) and a fixed blade (4), and the rotating body includes a rotor (5) and a rotary blade (6). The fixed blade (4) is fixedly coupled to the casing (3) and provided adjacent to the rotary blade (6), and the rotary blade (6) rotates integrally with the rotor (5) while adjacent to the fixed blade (4). At this time, sealing for airtightness is required in the gap between the fixed wing (4) and the rotary wing (6) and the gap between the fixed wing (4) and the rotor (5), and for sealing, a labyrinth seal (1) and a brush seal (2) are used. This combined structure has been disclosed. Here, the brush seal 2 is positioned adjacent to the rotating body with one end fixed to a preset position by welding or the like and the other end opened.

The present invention is intended to solve the above-described problems, and its purpose is to provide a brush seal assembly that improves sealing efficiency and turbine efficiency by reducing heat and friction generated by rubbing with a rotating body.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clear to those skilled in the art from the detailed description of the invention below. It will be understandable.

The brush seal assembly according to the present invention includes a seal housing located in a fluid flow space between a fixed body and a rotating body, formed along the circumferential direction of the rotating body, and having a fastening groove open toward the rotating body; And it may include a brush seal portion inserted into the insertion groove. The brush seal portion includes a core wire extending along the circumferential direction of the rotating body; a brush thread surrounding the core wire and having one end and the other end extending toward the rotating body; a clamping tube disposed to surround at least a portion of the circumference of the core wire with the brush thread interposed therebetween, to press the brush thread toward the core wire; and a plate that covers the clamping tube, presses one side and the other side of the clamping tube, and exposes one end and the other end of the brush seal toward the rotating body.

The plate may include a cover plate located relatively upstream with respect to the flow direction of the fluid and a support plate located relatively downstream. The cover plate may include a first cover body that covers one side of the brush seal, and a second cover body that is bent and extended from the first cover body and covers an upper side of the brush seal. The support plate includes a first support body that covers the other side of the brush seal, and a second support body that is bent and extended from the first support body and covers an upper side of the brush seal and is located on a lower side of the second cover body. Can include a body. The cover plate and the support plate may be fixed to each other by at least one fastening means.

The second cover body surrounds the outer peripheral surface of the second support body and may be further extended to cover at least a portion of the outer peripheral surface of the first support body.

An accommodating space in which at least a portion of the brush seal is accommodated may be provided between the other side of the brush seal and the first support body.

The first cover body may include a 1-1 cover part and a 1-2 cover part that is closer to the rotating body than the 1-1 cover part. The first support body may include a 1-1 support part and a 1-2 support part that is closer to the rotating body than the 1-1 support part. The gap between the 1-2 cover part and the 1-2 support part may be narrower than the gap between the 1-1 cover part and the 1-1 support part.

The 1-1 support part may be formed longer than the 1-2 support part.

The brush seal assembly according to the present invention may further include one or more auxiliary brush seals. The seal housing is open toward the rotating body and may include an auxiliary fastening groove having an arc-shaped cross section convex in a direction away from the rotating body. The auxiliary brush seal is disposed along the inner peripheral surface of the auxiliary fastening groove, and at least one end may extend toward the rotating body.

The brush seal assembly according to the present invention has the advantage of reducing heat and friction generated by rubbing with the rotating body.

In addition, according to the present invention, it has the advantage of simplifying the process by enabling assembly and disassembly through simple fastening means.

In addition, according to the present invention, when any one of the components of the brush seal assembly is damaged, only the damaged member can be easily replaced, which has the advantage of improving the convenience of maintenance.

In addition, according to the present invention, by having a combination structure of a brush seal and an auxiliary brush seal, it has the advantage of improving the sealing effect and turbine efficiency.

The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. .

Figure 1 is a schematic diagram showing an example in which a labyrinth seal and a brush seal are applied to the gap between the fixed body and the rotating body of the turbine.
Figure 2 is a diagram schematically showing a brush seal assembly according to the present invention.
3 and 4 are views for explaining the brush seal portion according to the present invention.
Figure 5 is a diagram for explaining the plate according to the present invention.
Figure 6 is a diagram for explaining examples of different shapes of plates according to the present invention.
Figure 7 is a diagram schematically showing a brush seal assembly according to another embodiment of the present invention.

Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the attached drawings. However, identical or similar components will be assigned the same reference numbers regardless of reference numerals, and duplicate descriptions thereof will be omitted. The suffixes “module” and “part” for components used in the following description are given or used interchangeably only for the ease of preparing the specification, and do not have distinct meanings or roles in themselves. Additionally, in describing the embodiments disclosed in this specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed descriptions will be omitted. In addition, the attached drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the attached drawings, and all changes included in the spirit and technical scope of the present invention are not limited. , should be understood to include equivalents or substitutes.

Terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Figure 2 is a diagram schematically showing a brush seal assembly according to the present invention. Figures 3 and 4 are views for explaining the brush seal portion according to the present invention. Figure 5 is a diagram for explaining the plate according to the present invention. Figure 6 is a diagram for explaining examples of different shapes of plates according to the present invention. Figure 7 is a diagram schematically showing a brush seal assembly according to another embodiment of the present invention.

2 to 5, the brush seal assembly 100 according to the present invention may be disposed on the fluid flow space 11. The fluid flow space 11 includes a stator 10 (or a fixture), which is a non-rotating component including a casing, etc., and a rotor 20, which is a rotating component including a rotor shaft, a rotor disk, etc. Alternatively, it may be a gap formed between (referred to as a rotating body). This fluid flow space 11 requires sealing for airtightness, and the brush seal assembly 100 can be used for this purpose.

The brush seal assembly 100 may be located within the insertion groove 13 formed in the stator 10. The insertion groove 13 is open toward the rotor 20 and may be formed in a ring shape along the circumferential direction of the rotor 20. The brush seal assembly 100 may be inserted into the insertion groove 13 of the stator 10 and extend along the circumferential direction of the rotor 20 to form a ring shape.

The brush seal assembly 100 may include a seal housing 110 and a brush seal portion 120.

At least a portion of the actual housing 110 may be inserted into the insertion groove 13 of the stator 10 so that movement may be restricted or limited to a preset range. At least a portion of the actual housing 110 may have an external shape corresponding to the insertion groove 13 formed in the stator 10, and movement may be restricted and restricted by the external shape. For example, the seal housing 110 may include a protrusion 111 protruding from the outer peripheral surface, and the protrusion 111 is caught on the seating portion 15 of the stator 10 to secure the seal housing 110 from the stator 10. ) can be prevented from leaving.

The seal housing 110 is open toward the rotor 20 and may include a fastening groove 113 extending in a ring shape along the circumferential direction of the rotor 20. The brush seal portion 120 may be inserted into the fastening groove 113 and remain at least partially fixed.

The brush seal unit 120 may include a core wire 121, a brush seal 123, a clamping tube 125, and plates 127 and 129.

The core wire 121 may extend along the circumferential direction of the rotor 20 to form a ring shape. The brush thread 123 may be made of a plurality of bristles. The brush seal 123 surrounds the core wire 121, and both one end and the other end may be positioned to extend toward the rotor 20.

The clamping tube 125 may secure the brush seal 123 to the core wire 121. The clamping tube 125 is arranged to surround at least a portion of the brush seal 123 to press the brush seal 123 toward the core wire 121, thereby fixing the position of the brush seal 123. there is. The clamping tube 125 surrounds the core wire 121 with the brush seal 123 in between, and is partially open so that one end and the other end of the brush seal 123 are exposed toward the rotor 20. It can have a shape.

The plates 127 and 129 may include a cover plate 127 and a support plate 129. The dotted arrows shown in the drawing indicate the flow of fluid, and the plates 127 and 129 located relatively upstream of the fluid flow are the cover plates 127, and the plates 127 and 129 located relatively downstream of the fluid. 129) may be a support plate 129. As shown, the support plate 129 may support the brush seal 123 that moves according to the flow of fluid or thermal deformation such as thermal expansion.

The cover plate 127 and the support plate 129 may be inserted and fixed into the fastening groove 113 of the seal housing 110 in a coupled state. By combining the cover plate 127 and the support plate 129, an internal space open toward the rotor 20 can be provided. At least a portion of the core wire 121, the clamping tube 125, and the brush seal 123 may be accommodated in the internal space. The brush seal 123 is accommodated in the internal space, and one end and the other end thereof may protrude outward toward the rotor 20.

The cover plate 127 and the support plate 129 may be coupled to each other to protect the brush seal 123 and perform the function of fixing the position of the brush seal 123. The cover plate 127 and the support plate 129 are located on one side (e.g., the side opposite to the fluid flow or relatively upstream of the fluid flow) and the other side (e.g., the side opposite to the fluid flow) and the other side (e.g., the side opposite to the fluid flow) of the brush seal 123. They may be mutually secured by at least one fastening means while positioned opposite each other on the downstream side of the flow. In response to this, the inner surface of the cover plate 127 and the inner surface of the support plate 129 press the clamping tube 125 accommodated in the internal space toward the core wire 121, thereby forming the clamping tube 125 and the brush seal. The movement of (123) can be restrained.

More specifically, the cover plate 127 covers one side of the brush seal 123 and is bent and extended from the first cover body 127a and covers the upper side of the brush seal 123. It may include a second cover body 127b. The support plate 129 includes a first support body 129a that covers the other side of the brush seal 123, and a second support body that is bent and extended from the first support body 129a and covers the upper side of the brush seal 123. (129b) may be included.

In the assembled state, the gap between the first cover body 127a and the first support body 129a is a preset value that can pressurize the clamping tube 125 accommodated between the cover plate 127 and the support plate 129. Can be set at intervals. The second cover body 127b and the second support body 129b may be arranged in a stacked state on the upper side of the brush seal 123 and may be fixed through at least one fastening means 135. The fastening means 135 may be a screw, but is not limited thereto.

The second cover body 127b surrounds the outer peripheral surface of the second support body 129b and may extend to cover at least a portion of the outer peripheral surface of the first support body 129a. The extended portion may be referred to as a swaging lip (127c), and the swaging lip (127c) firmly maintains the mutual fixation between the cover plate 127 and the support plate 129, and clamps the clamping tube 125. ) can perform the function of maintaining the pressurized state more effectively.

The brush seal assembly 100 according to the present invention configured as described above has the advantage of simplifying the process by enabling assembly and disassembly through simple fastening means. In addition, the present invention has the advantage of improving the convenience of maintenance because when any one of the components of the brush seal assembly 100 is damaged, only the damaged member can be easily replaced.

A predetermined accommodation space 131 may be provided between the other side of the brush seal 123 and the first support body 129a. The accommodation space 131 may be a space in which a part of the brush seal 123 can be accommodated or moved when the brush seal 123 is thermally expanded. When the brush seal 123 thermally expands, at least part of it is accommodated in the receiving space 131, thereby minimizing friction and interference between the brush seal 123 and the rotor 20, thereby improving the frictional flexibility of the brush seal 123. There are advantages that can be improved. Meanwhile, in the case of the prior art in which the brush seal 123 is fixed to a plate by a method such as welding, it is necessary to prevent separation due to movement of the brush seal 123, so the movement of the brush seal 123 as in the present invention Of course, it is impossible to provide an acceptable accommodation space within the preset range. In addition, the space between one side of the brush seal 123 and the first cover body 127a may have insufficient effect due to the accommodation space 131. That is, since fluid is accommodated in the space between one side of the brush seal 123 and the first cover body 127a, it may be difficult to accommodate the brush seal 123.

The first cover body 127a may include a 1-1 cover part 127a1 and a 1-2 cover part 127a2. The 1-2 cover part 127a2 may refer to a part closer to the rotor 20 than the 1-1 cover part 127a1. The first support body 129a may include a 1-1 support part 129a1 and a 1-2 support part 129a2. The 1-2 support part 129a2 may refer to a part closer to the rotor 20 than the 1-1 support part 129a1.

The gap G1 between the 1-1 cover part 127a1 and the 1-1 support part 129a1, and the gap between the 1-2 cover part 127a2 and the 1-2 support part 129a2 ( G2) may be different from each other. The gap G1 between the 1-1 cover part 127a1 and the 1-1 support part 129a1 is designed to secure a space in which a part of the brush seal 123 is accommodated when the brush seal 123 thermally expands. It can be formed to have a set interval.

The gap G2 between the 1-2 cover part 127a2 and the 1-2 support part 129a2 is the gap between the 1-1 cover part 127a1 and the 1-1 support part 129a1 ( It can be set narrower than G1). That is, by securing a predetermined space between the 1-1 cover part 127a1 and the 1-1 support part 129a1, a space where a part of the brush seal 123 can be inserted due to thermal expansion is secured, and the fluid In order to limit the movement of one end (open end) and the other end (open end) of the brush thread 123 according to the flow to a preset range, a 1-2 cover part 127a2 and a 1-2 support part 129a2 The gap G2 may be set to be narrower than the gap G1 between the 1-1 cover part 127a1 and the 1-1 support part 129a1.

Referring further to FIG. 6, in order to sufficiently secure the accommodation space 131 provided between the other side of the brush seal 123 and the first support body 129a, the 1-1 support portion 129a1 is the 1-1st support part 129a1. 2 It may be formed to be longer than the support portion 129a2. The length of the 1-2 support portion 129a2 may be selected within a range that ensures strength sufficient to support the brush seal 123, taking into account the material of the support plate 129.

The brush seal assembly 100 may further include an auxiliary brush seal portion 150.

As an example, the auxiliary brush seal 150 may be a labyrinth seal 151. The present invention has a structure that combines the brush seal 123 and the labyrinth seal 151, so that the sealing state can be maintained more stably.

As another example, further referring to FIG. 7, the seal housing 110 is open toward the rotor 20 and may include an auxiliary fastening groove 160 extending in a ring shape along the circumferential direction of the rotor 20. You can. At least one auxiliary fastening groove 160 may be formed on the real housing 110 and may be arranged adjacent to the fastening groove 113 along the axial direction of the rotor 20. The auxiliary brush seal 153 may be inserted into the auxiliary fastening groove 160 to maintain at least a portion of the auxiliary brush seal 153 fixed. The auxiliary brush thread 153 may include a plurality of bristles.

In more detail, the auxiliary fastening groove 160 may have an arcuate cross-section with a convex rounded shape in the direction away from the rotor 20, and the auxiliary brush seal 153 has an arcuate inner peripheral surface of the auxiliary fastening groove 160. It may be arranged along and fixed to the stator 10. One end (open end) of the auxiliary brush seal 153 may extend toward the rotor 20, and, although not shown, both one end and the other end (open end) may extend toward the rotor 20. The present invention has a structure in which the brush seal 123 and the auxiliary brush seal 153 are combined, so that the sealing state can be maintained more stably.

The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

10: Fixed body (or stator) 20: Rotating body (or rotor)
100: Brush seal assembly 110: Seal housing
113: Fastening groove 120: Brush seal part
121: core wire 123: brush thread
125: clamping tube 127: cover plate
129: support plate

Claims (7)

A seal housing located in the fluid flow space between the fixed body and the rotating body, formed along the circumferential direction of the rotating body, and having a fastening groove open toward the rotating body; and
It includes a brush seal portion inserted into the insertion groove,
The brush seal portion is
a core wire extending along the circumferential direction of the rotating body;
a brush thread surrounding the core wire and having one end and the other end extending toward the rotating body;
a clamping tube disposed to surround at least a portion of the circumference of the core wire with the brush thread interposed therebetween, to press the brush thread toward the core wire; and
A brush seal assembly comprising a plate that covers the clamping tube, presses one side and the other side of the clamping tube, and exposes one end and the other end of the brush seal toward the rotating body.
According to claim 1,
The plate is,
It includes a cover plate located relatively upstream with respect to the flow direction of the fluid and a support plate located relatively downstream,
The cover plate is,
A first cover body that covers one side of the brush seal, and a second cover body that is bent and extended from the first cover body and covers an upper side of the brush seal,
The support plate is,
A first support body that covers the other side of the brush seal, and a second support body that is bent and extended from the first support body and covers an upper side of the brush seal and is located below the second cover body,
The brush seal assembly, wherein the cover plate and the support plate are fixed to each other by at least one fastening means.
According to claim 2,
The second cover body,
A brush seal assembly that surrounds the outer peripheral surface of the second support body and further extends to surround at least a portion of the outer peripheral surface of the first support body.
According to claim 2,
A brush seal assembly providing an accommodation space in which at least a portion of the brush seal is accommodated between the other side of the brush seal and the first support body.
According to claim 4,
The first cover body,
It includes a 1-1 cover part and a 1-2 cover part that is closer to the rotating body than the 1-1 cover part,
The first support body is,
It includes a 1-1 support part and a 1-2 support part adjacent to the rotating body than the 1-1 support part,
The gap between the 1-2 cover part and the 1-2 support part is,
A brush seal assembly formed to be narrower than the gap between the 1-1 cover part and the 1-1 support part.
According to claim 5,
The 1-1 support part is,
A brush seal assembly formed to be longer than the 1-2 support portion.
According to claim 1,
further comprising one or more auxiliary brush threads;
The seal housing is,
It is open toward the rotating body and includes an auxiliary fastening groove having an arch-shaped cross section convex in a direction away from the rotating body,
The auxiliary brush thread is,
A brush seal assembly disposed along an inner peripheral surface of the auxiliary fastening groove, and at least one end extending toward the rotating body.