JP2003106458A - Plate brush seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the stacking of a plate-shaped base part of a plate brush seal and to provide an interval without using a spacer for a dimensional difference between the inside diameter and an outer shape when stacking annularly. SOLUTION: The plate-shaped base part 3B is provided with a stacked groove part 14 formed by folding side plate parts 13 in the width directional both sides, an designed interval H is provided between the bottom surface 14A and the back surface 14B of the respective adjoining stacked groove parts 14 by stacking the stacked groove parts 14 of the plate base part 3B in the same direction, and the designed interval H is formed of a folding angle of the side plate part 13 forming the stacked groove part 14.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to, for example, an aircraft,
The present invention relates to a brush seal device in which a seal plate that seals between two component parts of a rotating shaft of a gas turbine or the like that moves relative to each other is stacked. In particular, even if one of the two components makes a slight change, the brush seal of the seal plate can be deformed in response to the change of the one part, and the seal plates are overlapped with each other without a gap to seal the two parts. The present invention relates to the technical field of such a brush seal device.

[0002]

2. Description of the Related Art As prior art relating to the present invention, Japanese Patent Laid-Open No.
0-196801 exists. This publication discloses a brush seal device 100 shown in FIG.
FIG. 15 shows the casing 110 through which the rotary shaft 120 penetrates.
3 is a perspective view of the brush seal device 100 mounted between the rotary shaft 120 and the rotary shaft 120. FIG. This casing 110
Is a component of a steam turbine or a gas turbine, and the thin plate on which the brush seal device 100 is stacked is the casing 1
The fluid pressure is sealed by partitioning the space between the rotary shaft 120 and the rotary shaft 120.

In FIG. 15, thin sealing plates 109 are stacked in the circumferential direction of the rotary shaft 120 to seal the high pressure side region P1 and the low pressure side region P2 in the stacking direction of the sealing plates 109. The outer peripheral portion of the seal plate 109 is brazed to form the mounting portion 104, and the casing 11 is mounted via the brazed mounting portion 104.
It is attached to the groove of 0. Further, the back plate 102 is arranged on the side surface of the low pressure side region P2 of the seal plate 109, and the holding plate 103 is arranged on the side face of the high pressure region side P1. The back plate 102 and the holding plate 103 support both sides of the seal plate 109.

However, the seal plate 10 formed in this way
When the rotary shaft 120 is eccentrically pressed against the shaft 9, the seal plate 109, which is overlapped and forms an annular body, becomes like a single metal body and loses an escape area for elastic deformation, and a spring corresponding to elastic deformation. Since the constant becomes large, it causes a problem that it becomes difficult to follow the eccentricity of the rotating shaft 60. For this reason, the gap between the seal plate 109 and the outer peripheral surface of the rotor 120 must be set large, and this gap causes a problem in the sealing ability of the sealed fluid. Further, the seal plates 109 that are joined and stacked in the direction in which the pressure of the sealed fluid acts have gaps due to the pressure of the sealed fluid that acts in the direction between the joint surfaces, so that there is no leakage of the sealed fluid. Problems arise with the sealing ability.

Further, since the sealing plate 109 in which thin plates are laminated in the annular direction may have several hundreds of thousands in the entire annular shape, its manufacture is extremely difficult and the material yield is extremely low. Furthermore, since the outer peripheral length is longer than the inner peripheral length of the ring-shaped body of the seal plate 109, the outer periphery of the seal plate 109 is longer, and the seal plate 109 has a triangular shape with a thicker outer peripheral side when viewed from the side. Must be formed. As a result, a problem occurs in the elastic deformation of the seal plate 109 against the abutment of the rotor 120. Then, when the seal plate 109 comes into contact with the rotor 120, the relative surface is rapidly worn. This causes a problem in the sealing ability.

[0006]

In the brush seal device 100 constructed as described above, when the rotary shaft 120 comes into contact with the seal plate 109 due to vibration or swing, the seal plate 109 is pressed against the rotary shaft 120. The tilt angle increases as the wear increases. Furthermore, the seal plate 1
09 is pressed against the rotating shaft 120, and the free end surface 105 of the seal plate 109 and the rotating shaft 1 are on the side opposite to the radial direction of the shaft center.
The gap with 20 becomes large with respect to swinging as the elastic deformation worsens. Then, the sealed fluid leaks from this gap. In order to prevent these, the seal plate 109 is inclined in the rotation direction of the rotary shaft, but since the seal plates 109 are arranged so as to form a wall between the seals by stacking hundreds of thousands of sheets, the seal plate 109 is inclined. It is difficult to exert the effect.

Since the plate seals 209 are arranged in layers one by one along the peripheral surface of the rotary shaft 120, the plate seals 209
The number of sheets of 09 becomes enormous, and the yield of materials deteriorates.
Further, since the increase of this material deteriorates the flexibility, the friction of the tip of the plate seal 209 accelerates the wear.

The present invention has been made in view of the above problems, and a technical object thereof is to make it possible to easily stack plate brush seal single plates while positioning them. is there. And, it is to reduce the assembly cost. Further, when the plate brush seal single plates are laminated in an annular shape, the plate brush seal single plates can be attached to the dimensional difference between the laminated inner peripheral diameter and outer peripheral diameter without providing a spacer. Then, even if the rotor contacts the plate brush seal single plate, it is elastically deformed to reduce friction. Further, it is to improve the yield of the material manufactured by the plate brush seal. Further, it is to facilitate the attachment of the attachment portion of the plate brush seal and reduce the influence of thermal deformation even when the attachment portion is welded. or,
It is to reduce the thickness of the plate brush seal single plate to improve the sealing ability and to improve the sealing effect of the gap between the plate brush seal and the rotor.

[0009]

The present invention has been made to solve the above problems, and its technical means is configured as follows.

According to the plate brush seal of the present invention as defined in claim 1, an inner peripheral plate brush is provided with a fixed part, which is formed by laminating an outer peripheral plate-shaped base portion and integrally forming it on one component which is fitted and relatively moves. A plate brush seal that seals between the other shaft and the other shaft, the plate brush having a plate-shaped base portion on the outer circumference and a plate brush portion on the inner circumference that are laminated in the circumferential direction of the shaft to form an annular shape. A seal single plate is provided, and the plate-shaped base portion has stack groove portions formed by bending side plate portions on both sides in the width direction, and the stack groove portions of the plate-shaped base portions are stacked in the same direction and are adjacent to each other. There is a design distance between the bottom surface of the overlapping groove portion and the back surface of the overlapping groove portion, and the design distance is formed by the bending angle of the side plate portion forming the overlapping groove portion.

In the plate brush seal of the present invention according to claim 1, both side plate portions of the plate-shaped base portion of the plate brush seal single plate are bent to form the overlapping groove portions, and the overlapping groove portions are sequentially arranged in the same direction. It is formed so as to overlap each other and become a ring shape. For this reason, since the plate-shaped base portions are held by the overlapping groove portions that are overlapped with each other so as not to shift, it is easy to stack and assemble the plate brush seal single plates with each other, and when the plate brush seal single plates are assembled in an annular shape, It becomes possible to adjust the dimensional difference between the laminated inner diameter and outer shape of the plate by the design gap.

Further, the plate-shaped base has the overlapping groove portions stacked and held so as not to laterally shift, and the elastic side plate portions on both sides of the overlapping groove portion hold the plate brush portion on the free end side. The plate brush portion can be elastically deformably supported. Further, even if the shaft comes into contact with the plate brush part, the plate brush part is easily elastically deformed, so that it is possible to elastically deform the contact and prevent wear.

In the plate brush seal of the present invention according to claim 2, the design clearance is determined in a triangular shape from the space between adjacent free ends of the plate brush seal veneer and the entire length of the plate brush seal veneer. It is formed substantially in the length dimension of one side.

In the plate brush seal of the present invention according to claim 2, since the stacking intervals are optimally stacked when the plate-shaped base parts are stacked in an annular shape, the number of plate brush seal single plates is minimized to reduce the weight. Can be achieved. Also, if you set the spacing of the free end of the plate brush according to the sealing ability,
It becomes possible to configure the plate brush seal veneer into the minimum combination.

In the plate brush seal of the present invention according to claim 3, the overlapping groove portion is bent and formed in a trapezoidal shape.

In the plate brush seal according to the third aspect of the present invention, since the overlapping groove portion of the plate-shaped base portion is bent and formed in a trapezoidal shape, when the plate-shaped base portions are stacked, the bonding force is stable. Retained.

In the plate brush seal of the present invention according to claim 4, the plate brush portion is bent from the plate-shaped base portion and is inclined.

In the plate brush seal according to the fourth aspect of the present invention, by tilting the plate brush portion with respect to the radial direction of the shaft, it is possible to elastically deform and respond to the swing of the shaft. . Therefore, it is possible to prevent wear due to contact with the shaft. In particular, in the configuration in which the plate brush seal single plates are laminated in the circumferential direction, the elastic deformation of the plate brush portion is reduced, so that it is possible to impart further elastic deformation by inclining.

In the plate brush seal of the present invention according to claim 5, the plate-shaped base portion is integrally formed by welding the side plate portion of the overlapping groove portion.

According to the plate brush seal of the present invention according to claim 5, in the prior art, when the thin plate-shaped base portion is welded, the plate-shaped base portion causes thermal deformation, causing a problem even in the plate brush portion. When welding the bent side plates of the overlapping groove, the overlapping grooves are joined to each other and are held so that they do not shift, and the bent side plates are welded so that they can be firmly fixed even by simple welding. Will be possible. Therefore, the influence of the small welding does not deform the plate brush portion through the bent portion, so that it is possible to exert the sealing ability of the plate brush portion.

Also, in the method of welding and fixing the side plate portion of the plate-shaped base portion, since the overlapping groove portions are integrally positioned and joined, the welding can be made minute. Moreover, since the plate-shaped base is firmly held by the joining of the overlapping grooves and the fixation by welding, and the plate-shaped base is formed in the working direction of the sealed fluid, the plate-shaped base has strength in the working direction of the sealed fluid. Since it exerts a counter force, it can be expected to have an effect of eliminating the need for mounting plates such as a back plate and a holding portion.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a plate brush seal according to the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a half sectional view showing a state where the plate brush seal 2 of the present invention is attached. In addition, FIG. 2 is a view 1 viewed from the inside
It is a top view of a part. The following drawings are not so-called patent drawings, but are design drawings based on experiments.

1 and 2, the plate brush seal 2
Shows the first embodiment. The plate brush seal 2 is configured as follows. A shaft 60 is fitted in a hole of a casing 50 of a device such as a gas turbine. A plate brush seal 2 is attached between the casing 50 and the shaft 60 that move relative to each other, and the plate brush seal 2 seals the space therebetween. The plate brush seal 2 is formed in a ring shape by laminating plate brush seal single plates 3 along the peripheral surface of the shaft. In this plate brush seal single plate 3, a fixing portion 4 in which an outer peripheral plate-shaped base portion 3B is formed in an annular shape and welded is attached to a casing 50, and a free end portion 11 of an inner peripheral plate brush portion 3A is attached. The shaft 60 is fitted to seal the space between the shaft 60 and the shaft 60.

This plate brush seal 2 has a plate-shaped base 3B.
A back plate portion 6 is provided on the side surface on which is overlapped, and the back plate portion 6 holds the plate-shaped base portion 3B of the plate brush seal 2 and seals the plate-shaped base portion side against the sealed fluid. Further, a holding portion 10 is provided on the opposite side of the back plate portion 6 with a plate brush seal 2 interposed therebetween.
The plate brush seal 2 is sandwiched between and. The plate brush portion 3A is arranged so as to widen in the direction P1 to P2 on which the fluid to be sealed acts, and by forming this wide, it is configured to counter the pressure of the fluid to be sealed. The plate brush seal 2, the back plate portion 6, and the holding portion 10
The mounting part consisting of the mounting part 1 is attached to the step part of the casing 50.
Attached via 2.

FIG. 4 shows the plate brush seal single plate 3 shown in FIG.
FIG. 3 is a plan view of a plate brush seal veneer 3 which is one example of the above. FIG. 5 shows a plate brush seal single plate 3 according to another embodiment.
FIG. Further, FIG. 3 is a front part showing the stacking direction of the plate-shaped base part in which two plate brush seal single plates 3 are stacked.

In FIG. 4, side plate portions 13 are formed on both sides of the plate-shaped base portion 3B of the plate brush seal single plate 3.
The side plate portion 13 is bent at a set bending angle as shown in FIG. The thickness t of the plate brush seal veneer 3 is substantially constant. Then, when the side plate portion 13 is bent at the bending angle θ, the overlapping groove portion 14 is formed between the side plate portions 13, 13. The bottom surface 14A of the overlapping groove portion 14 is formed to have substantially the same width as the width of the plate brush portion 3B. The opposite surface of the bottom surface 14A is formed on the back surface 14B, and the width of the back surface 14B is formed wider than the width of the bottom surface 13A as a result of the bending process with the male mold in the female mold.

Then, when the overlapping groove portions 14 of the plate-shaped base portions 3B of the plate brush seal single plates 3 are laminated in the same direction, the side plate portion 1 is formed.
The supporting surface 13A of No. 3 is joined with the joining surface 13B of the side plate portion 13 of the adjacent plate brush seal veneer 3 in the overlapping groove portion 14. At the same time, a design space H is formed between the bottom surface 14A and the back surface 14B. The design interval H is configured such that the size of the design interval H becomes large or small depending on the bending angle. The design interval H increases as the bending angle θ increases, and the design interval H decreases as the bending angle decreases.

The plate brush seal single plate 3 shown in FIG.
3 is formed small. This plate brush seal single plate 3 is used for the plate brush seal 2 shown in FIG. The plate brush seal single plate 3 shown in FIG. 5 has a large side plate portion 13. This plate brush seal single plate 3 is used for the plate brush seal 2 shown in FIG.

FIG. 6 shows a structure in which six plate brush seal single plates 3 are laminated, and the two plate brush seal single plates 3 shown in FIG.
FIG. 7 is an overall front view in which the number of laminated sheets of is increased. The interior surrounded by O shown in FIG. 6 is an enlarged view as shown in FIG.

FIG. 7 shows a second embodiment of the present invention, and is a state view seen from the stacking direction side of a plate-shaped base portion 3B in which 20 plate brush seal single plates 3 shown in FIG. 5 are stacked. . Further, FIG. 8 is a perspective view of FIG. 7. The plate brush seal 2 of FIG. 8 shows a laminated arrangement when it is formed in a linear shape or a large diameter. Then, the side plate portion 1 of the plate brush seal 2
The welded portions 16 welded to each other are fixed to each other to form the fixed portion 4.

FIG. 9 shows a part in which the plate brush seal single plates 3 are laminated around the shaft 60 to form an annular shape. Since this plate brush seal single plate 3 is the plate brush seal single plate 3 shown in FIG. 5, the side plate portion 13 is formed large. In this plate brush seal 2, since the bonding force of each plate-shaped base portion 3B is strong, the plate-shaped base portion 3 is formed by a groove portion (not shown) provided in the back plate portion 6 and the holding portion 10 without welding.
If the fixing method for holding B is adopted, it becomes possible to firmly fix.

FIG. 10 is a perspective view in which 20 plate brush seal single plates 3 shown in FIG. 4 are laminated. Although the plate brush seal single plate 3 is shown in a linear state, the plate brush seal single plates 3 may be laminated in an annular shape. Since the side plate portion 13 of the plate brush seal single plate 3 is formed small, the side surfaces of the side plate portion 13 are welded in two rows to form the welded portions 16 and the whole is the fixed portion 4. Moreover, since the side surface of the side plate portion 13 is welded, the influence of the deformation of the array due to the heat associated with the welding can be prevented.

FIG. 11 shows a second embodiment of the present invention, which has substantially the same configuration as that of FIG. The difference is that the plate brush portion 3B is bent and inclined from the boundary portion of the plate-shaped base portion 3A. Then, both sides of the side surface of the side plate portion 13 are welded at one place to form a welded portion 16, and the entire portion is formed as a fixed portion 4. Although the array of the free ends 11 of the plate brush portion 3A is formed in a linear shape, it may be formed in an annular shape.

FIG. 12 shows the plate brush seal single plate 3 of FIG.
It is a perspective view showing the state of stacking. As is apparent from FIG. 12, even if the side plate portion 13 is welded, the side plate portion 13 projects to the side of the plate brush seal single plate 3, so that thermal deformation of the plate brush portion 3A can be prevented. . Also, the overlapping groove portion 14 of the plate-shaped base portion 3B of each plate brush seal single plate 3 is
Since they are laminated and fitted in the same direction, the binding force is strong even when the plate-shaped base portions 3B are laminated. Moreover, since welding can be performed in this joined state, it is expected that the welding can be simplified and the binding force can be strengthened even with minute welding.

Further, when the plate brush portion 3A is bent so as to be inclined, the binding force is further strengthened, and the plate brush seal single plate 3 can be made thin. For this reason, since the plate brush seal single plate 3 can be made thin along with the inclination of the plate brush portion 3A, even when the shaft 60 abuts, the plate brush seal single plate 3 is elastically deformed in accordance with the acting force to reduce the friction force. Will be possible. As a result, the effect of preventing wear of the two abutting can be expected.

Further, the plate brush seal single plate 3 described above
The material of the is steel plate, stainless steel plate, nickel-based alloy plate,
A material such as a ceramic plate is used. And, the plate brush seal veneer 3 is manufactured by etching the thin plate,
It is simply formed by a fine processing technique such as wire electric discharge machining, electron beam machining, or laser machining, and the cut part is pressed to form the overlapping groove portion 14.

[0037]

EFFECTS OF THE INVENTION According to the brush seal device of the present invention, the following excellent effects are obtained.

According to the plate brush seal of the present invention as defined in claim 1, the plate bases of the single plate of the plate brush seal are held so that the plate bases are not displaced from each other by the overlapping grooves formed by bending the both side plate parts. Therefore, it is easy to stack and assemble the plate brush seal veneers with each other, and when assembling the plate brush seal veneers in an annular shape, the dimensional difference between the laminated inner diameter and the outer shape of the plate brush seal veneers should be formed into an annular shape by the design gap. Has the effect of enabling.

Further, the plate-like base holds the overlapping groove portions so as not to be laterally displaced and holds the plate brush portions on the free end side by the elastic side plate portions on both sides of the overlapping groove portion. The effect of elastically deformably supporting the plate brush portion is obtained. Further, even if the shaft comes into contact with the plate brush part, the plate brush part is easily elastically deformed, so that an effect of elastically deforming against the contact and preventing wear can be expected.

According to the plate brush seal of the second aspect of the present invention, if the stacking interval of the free ends of the plate brush section is set according to the sealing ability, the plate-like base side is based on this stacking interval. Since the design interval can be set, the stacking interval can be optimally stacked when the plate-shaped bases are stacked in an annular shape. Then, it becomes possible to reduce the number of single plates of the plate brush seal to reduce the weight, and
Since the structure of the plate brush seal single plate is simplified, it is possible to cope with elastic deformation and prevent wear due to friction. Further, if the distance between the free ends of the plate brush portions is set according to the sealing ability, it is possible to configure the plate brush seal single plate in the minimum combination, so that there is an effect that the size can be reduced.

According to the plate brush seal of the third aspect of the present invention, since the overlapping groove portion of the plate-shaped base portion is bent and formed into a trapezoidal shape, the bonding force when the plate-shaped base portions are stacked is stacked. Strongly retained. At the same time, since the plate-shaped base portion is formed in the overlapping groove portion and coupled so as to be fitted therein, it is possible to easily weld the side plate portions. Moreover, since it can be fixed simply by welding, it is possible to prevent thermal adverse effects due to welding, prevent deformation of the array of plate brushes due to welding, and improve the sealing ability of the plate brushes. Play.

According to the plate brush seal of the fourth aspect of the present invention, the plate brush portion is inclined with respect to the radial direction of the shaft, so that it is possible to respond elastically to the swing of the shaft. become. Therefore, the effect of preventing wear due to contact with the shaft is exerted. In particular, in the configuration in which the plate brush seal single plates are laminated in the circumferential direction, the elastic deformation of the plate brush portion is reduced, and therefore further elastic deformation is imparted by inclining the plate brush portion to prevent friction and wear of the plate brush portion. Produce an effect.

According to the plate brush seal of the fifth aspect of the present invention, the welding of the bent side plate portion of the overlapping groove portion of the plate-shaped base is held so that the overlapping groove portions are joined to each other and are not displaced. Since the bent side plate portion is welded to the upper side, it is possible to firmly fix the side plate portion even by simple welding. Because of this, the effect of small welding is
Since the plate brush portion is not deformed through the bent portion, the plate brush portion can exert its sealing ability.

[Brief description of drawings]

FIG. 1 is an axial half-sectional view of a plate brush seal of the present invention.

FIG. 2 is a plan view of a part of the plate brush seal as viewed from the inner diameter side of FIG.

FIG. 3 is a front view of a part of an overlapping groove portion of two plate brush seal single plates according to the present invention.

FIG. 4 is a plan view of a plate brush seal single plate according to an embodiment of the present invention.

FIG. 5 is a plan view of a plate brush seal single plate according to another embodiment of the present invention.

FIG. 6 is a partially stacked plan view of the stacked plate-shaped bases of FIG. 3;

FIG. 7 is a front view of a plate brush seal according to a second embodiment of the present invention in which the plate brush seal single plates shown in FIG. 5 are laminated.

8 is a perspective view of the plate brush seal of FIG. 7. FIG.

9 is a perspective view of a part of the plate brush seal single plates of FIG. 5 arranged in an annular shape.

FIG. 10 is a perspective view of a part of the laminated plate brush seal single plates shown in FIG.

FIG. 11 is a partial perspective view of a plate brush seal showing a third embodiment according to the present invention.

12 is a perspective view showing a laminated state of plate brush seal single plates of the plate brush seal shown in FIG. 11. FIG.

FIG. 13 is a partial perspective view of a conventional brush seal device.

[Explanation of symbols]

1 Brush seal device 2 plate brush seal 3 plate brush seal veneer 3A plate brush section 3B Plate-shaped base 4 fixed part 6 Back plate 10 Holder 11 Free end 12 mounting parts 13 Side plate 13A support surface 13B joint surface 14 Stacking groove 14A bottom 14B back 16 Welded part 50 casing 60 axes H design interval

Claims (5)

[Claims] 1. A fixing portion, which is formed by laminating an outer peripheral plate-shaped base portion and is integrated with one component that is fitted and relatively moved, seals a gap between the inner peripheral plate brush portion and the other shaft. A plate brush seal, comprising a plate brush seal single plate having a plate-shaped base portion on the outer periphery and a plate brush portion on the inner periphery, which is laminated in the circumferential direction of the shaft and formed in an annular shape, and the plate-shaped base portion. Has a stack groove portion formed by bending side plate portions on both sides in the width direction, and is designed between the bottom surface and the back surface of each adjacent stack groove portion by stacking the stack groove portions of the plate-shaped base in the same direction. A plate brush seal having a gap, wherein the design gap is formed by a bending angle of a side plate portion forming the overlapping groove portion. 2. The design gap is formed to have a length dimension of one side which is divided into a space adjacent to each free end portion of the plate brush seal veneer and a length of the plate brush seal veneer in a triangular shape. The plate brush seal according to claim 1, wherein the plate brush seal is provided. 3. The plate brush seal according to claim 1, wherein the overlapping groove portion is bent and formed in a trapezoidal shape. 4. The plate brush seal according to claim 1, wherein the plate brush portion is bent and inclined from the plate-shaped base portion. 5. The plate-shaped base portion is integrally formed by welding the side plate portion of the overlapping groove portion. Plate brush seal.