JP5116833B2 - Plate brush seal device - Google Patents

Description

  The present invention relates to a plate brush seal device in which, for example, a thin plate that seals between a rotating shaft such as an aircraft and a gas turbine and a counterpart component that moves relative to each other is made into a brush shape, and a free end surface is formed to be uneven. In particular, even if one part fluctuates between two parts that move relative to each other, the plate brush seal elastically deforms following the fluctuation of one part, and effectively seals the gap with the other part. The present invention relates to the technical field of brush seal devices.

  In the prior art relating to the present invention, there is a brush seal device 100 shown in FIG.

  FIG. 8 is a cross-sectional view of the brush seal device 100 attached to the casing 110 through which the rotary shaft 120 passes. The casing 110 is a component of a steam turbine or a gas turbine, and the brush seal device 100 seals the fluid to be sealed so as to partition the casing 110 and the rotating shaft 120.

  In FIG. 8, the brush seal device 100 is formed in a ring shape and attached to the groove portion 112 of the casing 110. The main components of the brush seal device 100 are a brush seal 109, a back plate 102, and a support plate 103. In the brush seal 109, the bristles 101 are arranged in a wall shape along the circumference, and one end portions are joined to form the attachment portion 104. The free end surface 105 of the brush seal 109 faces the rotation shaft 120. The wire diameter of the bristles 101 is generally 0.02 mm to 0.5 mm. And the number is used as tens of thousands and hundreds of thousands.

  On the side surface of the brush seal 109, an annular back plate 102 is arranged with the side surface 108 in contact with the brush seal 109, and supports the bristles 101 against the action of the pressure of the sealed fluid.

  On the other surface of the brush seal 109, a holding plate 103 is formed as a ring plate and is integrally disposed so as to sandwich the mounting portion 104 side of the brush seal 109 with the back plate 102. The holding plate 103 is narrowed in the radial direction to expose the brush seal 109 so that the sealed fluid can act on the side surface of the brush seal 109.

  The back plate 102, the attachment portion 104 of the brush seal 109, and the holding plate 103 are formed at the coupling portion 106 by welding at one end.

  FIG. 9 is a front view of a part of the brush seal 109. The brush seal device 100 in FIG. 10 is in a normally fitted state where the brush seal 109 and the rotary shaft 120 do not swing, and the bristles 101 form a straight line with respect to the radial direction of the rotary shaft 120. In the direction of rotation. The normal state of the brush seal 109 is that the rotating shaft 120 is in contact with or close to the free end surface 105 as shown by the solid line in FIG.

  FIG. 10A is a perspective view of the free end face side of the brush seal 109. In FIG. 10, the free end surface 105 is precision finished by a wire electric discharge machine or the like so as to be fitted to the rotating shaft after being manufactured by the brush seal 109. However, since the bristles 101 are easily deformed, this processing is extremely difficult. It is also difficult to finish the free end face 105 precisely.

Furthermore, as another conventional technique, Patent Document 1 discloses a brush seal device shown in FIG. In FIG. 11, a thin plate is stacked as the plate seal 209 in the circumferential direction of the rotary shaft 120 to seal the high pressure side region P1 and the low pressure side region P2.

  The outer peripheral portion of the plate seal 209 is brazed to be formed on the mounting portion 104, and is attached to the groove portion of the casing 110 through the brazed mounting portion 104. A back plate 102 is disposed on the side surface of the low-pressure side region P2 of the plate seal 209, and a holding plate 103 is disposed on the side surface of the high-pressure region side P1. Supports both sides.

  However, when the rotary shaft 120 is eccentrically pressed against the plate seal 209 formed in this way, the plate seal 209 that is overlapped to form an annular body loses the escape field that is elastically deformed, and corresponds to the elastic deformation. Since the spring constant increases, it causes a problem that it becomes difficult to follow the eccentricity of the rotating shaft 60. For this reason, since the space | interval of the board seal 209 and the outer peripheral surface of the rotor 120 is taken large, a problem arises in the sealing of the fluid to be sealed.

  Further, the plate seal 209 joined and overlapped in the direction in which the pressure of the sealed fluid acts is formed with a gap due to the pressure of the sealed fluid acting in the direction between the joining surfaces. Problems arise in sealing ability.

  Furthermore, the plate seal 209 in which thin plates are laminated in the annular direction may be several hundreds of thousands in the entire annular shape, so that it is extremely difficult to manufacture. Furthermore, since the outer peripheral length is longer than the inner peripheral length of the annular body of the plate seal 209, a spacer must be provided on the outer peripheral side, and a gap is generated between the joint surfaces. Become. From this point, there is a problem of sealing ability. Furthermore, the laminated state in which the flexibility is hindered results in early wear of the free end surface 105 of the plate seal 209.

  In the brush seal device 1 configured as described above, when the rotary shaft 120 contacts the brush seal 109 due to vibration or swinging, the brush seal 109 is pressed against the rotary shaft 120 as shown in FIG. The tilt angle is also increased while remaining in the state.

  In this state, when the pressure of the sealed fluid is a high pressure P1, as shown in FIG. 8, the differential pressure (P1-P2) from the low pressure P2 increases, so the linear bristles 101 of the brush seal 109 are When the whole is pressed against the back plate portion, it becomes difficult to bend, and the followability with respect to the rotating shaft 120 is deteriorated.

  FIG. 10B is a front view of the brush seal 109 in FIG. 10A as viewed from the free end surface 105 on the inner diameter side.

  10 (a) and 10 (b), when the sealed fluid enters between the linear bristles 101, the bristles arranged as shown in FIG. 10 (a) as viewed from the inner peripheral surface side. As shown in FIG. 10B, 101 is pushed so that the bristles 101 are opened, so that the sealed fluid leaks from the divided gap. Further, when the bristles 101 in an inclined state are divided by pressure, one side of the divided bristles tends to be displaced so as to reduce the inclination angle, so that the radial length in the deformed state of the bristles 101 is increased. Becomes a long state, and the pressure contact force with the rotating shaft 120 is further increased to cause wear.

  In addition to such a state, in FIG. 8, with respect to the position where the brush seal 101 is in pressure contact with the rotating shaft 120 (the state shown in FIG. 9B), the radially opposite side of the axis is the free end face 105 of the bristles 101. The gap C with the rotating shaft 120 swings as shown by the phantom rotating shaft 120 in FIG. 8 and opens widely, and leakage of the sealed fluid occurs from the gap C.

  Also, in the plate seal 209 of FIG. 11, since the thin plate is joined in the direction in which the sealed fluid acts, when the sealed fluid acts, the gap between the joining surfaces of the thin plates is the same as in FIG. Since it is divided, the sealed fluid leaks. Furthermore, since the flexibility of the free end surface 105 of the plate seal 209 is hindered, the gap with the rotor 60 must be increased, which causes a problem in sealing performance. In addition, wear is accelerated by friction.

Japanese Patent Laid-Open No. 10-196801

The present invention has been made in view of the above-described problems, and its technical problem is to improve the sealing effect even if a gap between the plate brush seal and the rotor is opened.
Furthermore, the elastic deformation of the plate brush seal with respect to the pressing force from the rotating shaft is improved, and the wear of the plate brush seal by the rotating shaft is reduced.

  Another object of the present invention is to improve the sealing ability by improving the followability corresponding to the fluctuation of the outer periphery of the rotating shaft of the plate brush seal.

  The present invention has been made to solve the above-described problems, and technical means for solving the problems are configured as follows.

The plate brush seal of the present invention is a plate brush seal device which is attached to the one part between the components rotating relative to each other with a gap and seals between the other part,
A slit (9) is provided on the relative surface side of the other part of the thin plate to have a plate brush part (2a) formed on the brush part (8), and the one on the opposite side of the plate brush part (2a). A plate brush seal (2) in which a plate brush seal single plate (2P) having a mounting portion (3) composed of a base portion (2b) fixed to the component is laminated;
A back plate portion (6) having a support surface (7) coupled to the mounting portion (3) of the plate brush seal (2) and supporting the side surface of the plate brush seal (2);
A holding portion (10) for holding the attachment portion (3) of the plate brush seal (2) between the back plate portion (6);
The plate brush seal (2) is formed by laminating a concave layer (12A) and a convex layer (12B) of a plate brush seal having different inner diameters in the pressure direction of the sealed fluid, and forming an uneven portion ( 13).

In the plate brush seal device of the present invention, one side of a thin plate is processed into a strip shape, and a free end surface forms a plurality of plate brush seal single plates facing the relative surface of the other component, one of which has an inner diameter. It is formed by forming a concave layer with a large dimension and a convex layer with a small inner diameter on the other, and laminating plate brush seal single plates with different diameters alternately to form an uneven portion on the free end surface. Is provided so that the free end face can be fitted in close proximity to the other facing face.

  Furthermore, even if the rotor swings and a gap is generated between the free end surface and the other facing surface, the sealed fluid is throttled by the uneven portion, so that the loss of fluid flowing between the uneven portion as well as viscous resistance is increased. And the thermodynamic loss are added, the fluid resistance of the fluid flowing through the concavo-convex portion is increased, and the leakage of the sealed fluid can be reduced.

Moreover, since the conventional brush seal made of bristles consists of several hundred thousand, the inner peripheral surface had to be precisely machined to become an accurate circumferential surface by wire electric discharge machining or the like, but the plate brush seal Even if the gap between the free end surface and the other part is wide, the fluid resistance is increased by the uneven portion and a sealing effect is produced, so that it is not necessary to finish the free end surface precisely.

  Further, when the rotor, which is the other component, swings and comes into pressure contact with the plate brush seal, a gap C (see FIG. 8) is generated on the side that is symmetric to the axis of pressure contact. However, the sealing performance is improved by the large resistance of the fluid flowing through the gap with the rotor due to the uneven portion provided on the free end face of the plate brush seal. Therefore, an excellent sealing effect is exerted on the swinging rotor.

  Furthermore, the plate brush seal is integrated at the base of the thin plate that is not processed into a strip shape on the mounting portion side, and the mounting portion is formed simply by overlapping the plate brush seal, so there are hundreds of thousands of bristles and no welding. Thus, it is very easy to form the attachment portion as compared with the case where the attachment portion is formed.

Preferably, in the plate brush seal device of the present invention, the plate brush seal single plate (2P) forming the concave layer (12A) has the slit (9) inclined in the moving direction of the other component, and the convex layer The slits (9) of the plate brush seal single plate (2P) forming (12B) are formed in an S shape or the free end surface side of the S shape is formed in a straight beam (14) in the radial direction.

In the plate brush seal device of the present invention, when the convex layer is the other part, for example, when it is arranged in the proximity of the rotor, when the rotor swings and presses against the free end surface of the plate brush seal, Since the slits provided in the convex layer are formed in an S shape, the brush portion elastically deforms with respect to the rotor and weakens the pressure contact force when in the pressure contact state. For this reason, the plate brush seal can prevent wear due to friction with the rotor.

  In addition, since the concave layer is formed so that the slit is inclined, the brush portion having the S shape exhibits a spring constant smaller than that of the inclined brush portion and exerts an elastic deformation force in the radial direction. Can be supported in a composite manner. Then, it can receive a flexible acting force while being combined with the concave layer that forms the inclined direction, and can cope with the combined elastic force while following the pressure contact of the rotor due to a complicated vibration force. For this reason, it becomes possible to exhibit the sealing effect more effectively against the vibration force of the rotor. In addition, the combination of slits that are not in the same direction closes each other to provide a sealing ability.

Preferably, in the plate brush seal device of the present invention, the slit is inclined in the moving direction of the other component.

In the plate brush seal device of the present invention , for example, when the slit is inclined in the rotation direction of the rotor, it is possible to relieve the pressure contact force by being elastically bent in the inclination direction even if pressed against the rotor. become. For this reason, wear due to friction of the plate brush seal is prevented.

Preferably, in the plate brush seal device of the present invention, the slits of the plate brush seal single plates intersect with the stacking direction.

In the brush seal device of the present invention, when the slit of the plate brush seal unit plate intersects the stacking direction, the gap of the slit is closed by the brush portion adjacent to each other, the process fluid is a plate state It becomes possible to seal effectively by the plate brush seal which transforms.

Preferably, in the plate brush seal device according to the present invention, the plate brush seal single plate forming the convex layer has a slit inclined in the moving direction of the other component and the plate brush seal forming the concave layer. The single plate is formed into a thin plate without slits or a thin plate in which the width of the brush portion of the concave layer is larger than the width of the brush portion of the convex portion.

In the plate brush seal device of the present invention, when the slit of the convex layer is inclined in the rotation direction of the rotor, for example, it can elastically follow the rotation direction of the rotor. This prevents wear due to friction.

  And, since the plate brush seal single plate of the concave layer has no slit, or is formed in a plate brush seal having a dimension in which the gap between the slit and the slit is large, that is, a dimension in which the width of the brush part is large, The sealed fluid is reliably sealed by the concave layer in the gap with the other component. Therefore, the elastic followability by the convex layer and the excellent effect of sealing the sealed fluid by the concave layer are exhibited.

1 is a half sectional view of a plate brush seal device showing a first embodiment according to the present invention. It is a front view of the axial direction of FIG. It is a top view of the board brush seal single board of a 2nd embodiment concerning the present invention. (A) is a 1-part top view seen from the internal diameter of the plate brush seal apparatus which shows 3rd Embodiment concerning this invention, (b) is an enlarged view of the C section of Fig.4 (a). It is sectional drawing which shows the uneven | corrugated | grooved part of the plate brush seal apparatus which shows 4th Embodiment concerning this invention. (A) is a top view of the plate brush seal of the plate brush seal apparatus which shows 5th Embodiment concerning this invention, (b) is the board of the plate brush seal apparatus which shows 6th Embodiment concerning this invention. It is sectional drawing of a brush seal. It is a top view of the board brush seal which shows 7th Embodiment concerning this invention. It is a half sectional view of the brush seal device of the conventional example. FIG. 9A is a plan view of a part of FIG. 8, and FIG. 9B is a plan view of the brush seal device in a state where the rotor is eccentric in the state of FIG. (A) is a perspective view of the plate brush part of FIG. 8, (b) is the top view seen from the internal diameter side of the state which the to-be-sealed fluid acted on the brush seal apparatus of FIG. It is a perspective view of the other brush seal apparatus of a prior art example.

Hereinafter, a plate brush seal device according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, the following drawings are not inaccurate conceptual diagrams, but are design drawings with accurate dimensions.
FIG. 1 is a cross-sectional view of a plate brush seal device 1 that partitions a gap between a casing 50 and a rotor 60 of a gas turbine into a high pressure P1 side and a low pressure P2 side. 2 is a plan view of the plate brush seal shown in FIG. FIG. 3 is a plan view of a single plate brush seal single plate.

  In FIG. 1, reference numeral 1 denotes a plate brush seal device. The fixed portion 20 on the outer peripheral side of the plate brush seal device 1 is attached via a snap ring 12 to a stepped portion 51 provided on the inner peripheral surface of the casing 50 which is one component. The fixing portion can be attached to the groove portion 51 having a combined structure. Further, the free end portion 5 on the inner peripheral side of the plate brush seal device 1 is disposed in contact with or close to the outer peripheral surface of the rotor 60 which is the other component. Then, the sealed fluid on the high pressure P1 side is sealed by the plate brush seal device 1.

  The plate brush seal device 1 is mainly composed of a plate brush seal 2, a back plate portion 6 and a holding portion 10.

  As shown in FIG. 2, the plate brush seal 2 is formed into a strip shape by processing the inner peripheral side of the annular thin plate into a slit 9 inclined in the rotation direction of the rotor 60. The inner peripheral plate is configured as the plate brush portion 2 a, and the base portion 2 b of the outer peripheral plate configures the attachment portion 3.

  The plate brush portion 2a is formed in a brush portion 8 in which the inner diameter side of an annular thin plate is formed in a fine strip shape and the cross section is rectangular. A plurality of plate brush seal single plates 2P are arranged in a laminated state in the axial direction of the rotor (rotating shaft) 60 and formed on the wall. Further, the outer peripheral end portion is integrated by welding to form the attachment portion 3.

  The plate brush seal 2 is integrally formed by laminating the plate brush seal single plate 2P in a direction in which the pressure of the sealed fluid acts. The laminated plate brush seal single plate 2 </ b> P is formed by alternately laminating concave layers 12 </ b> A and convex layers 12 </ b> B having different inner diameters to form an uneven portion 13 on the free end surface 5. The concave layer 12A and the convex layer 12B may be one each, but a plurality of the layers are laminated and further laminated alternately. This is set by the degree of the sealing effect by the concavo-convex portion.

  The uneven portion 13 is formed in an uneven shape parallel to the outer peripheral surface of the rotor 60, but can also be formed in an uneven portion that gradually increases in diameter toward the low pressure P2. Further, the concave-convex portion 13 is formed by laminating a plate brush seal single plate 2P in which one concave layer 12A has a smaller inner diameter toward the low pressure side to form one concave layer 12A in a stepped cross section. There is also an embodiment adopted for the uneven portion 13.

  As an example, the plate brush seal 2 described above is provided with a slit 9 having a triangular gap on the inner peripheral side of a ring-shaped thin plate, and the cross section of the brush portion is formed in a square shape (rectangular or square). In addition, one side of the cross-sectional dimension is 0.5 to 0.005 × 0.5 to 0.005 mm, preferably 0.20 to 0.008 × 0.2 to 0.018 mm. The length is in the range of 5 to 50 mm. Further, the thickness of the wall is in the range of 0.4 to 5 mm, and this thickness is determined by the pressure of the sealed fluid.

  Furthermore, the material of the plate brush seal 2 is steel, stainless steel, nickel-based alloy, ceramic material, or the like.

  A plate brush seal single plate 2P shown in FIG. 3 is a second embodiment according to the present invention. The plate brush seal 2P is configured as a plate brush seal 2 by stacking a plurality of the plate brush seal single plates 2P according to the pressure of the sealed fluid. The plate brush seal single plate 2P is provided with a plate brush portion 2a formed into a strip shape by processing the inner peripheral side of an annular thin plate into a slit 9 by a method such as etching, pressing, or electric discharge machining. Yes. Further, the outer peripheral side is formed on a thin base portion 2b having no slit, and is integrated so that the plate brush portion 2a does not vary.

  Each slit 9 is formed in a triangular gap having a dimension that the inner diameter side becomes smaller. The shape of the slit 9 may be formed in a parallel gap as required. Further, the slit 9 forms a brush portion 8 that is inclined in the direction in which the rotor 60 rotates. The inclination angle of the brush portion 8 is determined from the rotational speed of the rotor 60 and the like. It is also possible to form the brush portion 8 in the radial direction for both forward and reverse rotations.

  The back plate portion 6 is provided with a fixing portion 6A that holds the mounting portion 3 of the plate brush seal 2 and a support surface 7 that supports the plate brush seal 2 so that it is not bent excessively by the pressure of the sealed fluid. ing. The plate brush seal 2 and the support surface 7 may be joined as shown in FIG. 1 or may be formed apart from each other.

  In the plate brush seal 2, the free end portion 5 comes into contact with the rotation shaft 60 when the rotation shaft 60 is shaken greatly. However, since the plate brush portion 2 a is formed by each brush portion 8 of a fine square plate, the spring constant. Therefore, it is possible to prevent wear by elastically following the contact caused by the swing of the rotor 60. For this reason, even if the plate brush seal 2 abuts on the rotor 60, the plate brush seal 2 can be elastically deformed according to the fluctuation of the rotor 60. That is, even if the rotor 60 is shaken, the contact is elastically softened according to the spring constant set in the plate brush seal 2. Furthermore, even if the rotor 60 swings slightly more in contact with the rotor 60, the brush portion 8 included in the plate brush seal 2 of the square plate is further prevented from being worn because the contact pressure is further reduced.

  In the plate brush seal 2, the attachment portion 3 is integrally coupled by the back plate portion 6 and the holding plate portion 10 by welding such as an electron beam, and the welded portion of these three parts forms a fixing portion 20. And the holding | maintenance part 10 is formed in the ring shape, and is formed in the dimension whose radial direction width is smaller than the backplate part 6. FIG. In FIG. 1, the holding portion 10 has a length that forms the fixing portion 20, but it can also be formed in a radial length close to the back plate portion 6. And in the case of this holding | maintenance part 10 with this long length, it forms in the space part into which a to-be-sealed fluid can flow in between the plate brush seal 2 and the side surface of the holding | maintenance board part 10. FIG.

  It is preferable to select materials for the back plate portion 6 and the holding portion 10 in accordance with the linear expansion coefficient of the casing 50. For example, it is made of a nickel-based alloy, iron, steel, stainless steel, or other non-ferrous metal. Furthermore, various materials are selected depending on the type of sealed fluid, temperature, or other application field conditions.

  FIG. 4A is a plan view of a part of the plate brush seal device 1 of FIG. 1 viewed from the inner diameter side. FIG. 4B is an enlarged view of a portion C in FIG. FIG. 4 shows a plate brush seal device 1 showing a third embodiment according to the present invention.

In FIG. 4A , the plate brush seal 2 is formed by laminating plate brush seal single plates 2 in eight layers. As shown in an enlarged view in FIG. 4B , the brush portions 8 are formed in a square shape in cross section, and the slits 9 are arranged so as not to form a line in the direction in which the pressure of the sealed fluid acts. They are staggered . By arranging in this way, leakage of the sealed fluid is prevented, so that the sealing ability is improved.

  And the convex layer 12B is arrange | positioned at the both sides of the plate brush seal 2 shown in FIG.4 (b), and the inner side is arrange | positioning the plate brush seal single plate 2P of the same internal diameter by 2 sheets alternately, and is a free end surface. 5 is formed in the uneven portion 13.

  FIG. 5 is a cross-sectional view of a part of the plate brush seal device 1. FIG. 5 shows a plate brush seal device 1 showing a fourth embodiment according to the present invention.

    In FIG. 5, the plate brush seal 2 is formed by alternately laminating concave layers 12 </ b> A in which five plate brush seal single plates 2 </ b> P are laminated and convex layers 12 </ b> B in the same multilayer, so that the whole is formed into nine layers. is there. And the uneven | corrugated | grooved part 13 is formed in the free end surface 5. FIG. The uneven portion 13 is formed with various uneven portions 13 depending on the number of laminated concave layers 12A, the number of laminated convex layers 12B, and the number of laminated concave layers 12A and convex products 12B. The uneven portion 13 is set based on the pressure of the sealed fluid.

  4B, the cross section of the brush portion 8 is formed in a long rectangular shape in the direction in which the pressure of the sealed fluid acts, and the slit 9 is 1 in the direction in which the pressure of the sealed fluid acts. They are shifted from each other so as not to form a line. Such an arrangement of the cross-sectional shapes of the brush portions 8 improves the sealing ability and improves the elastic deformation ability of the brush portions 8.

  FIG. 6 (a) shows a case where a slit 9 is provided on one side of a thin plate to form a plate brush seal single plate 2P. FIG. 6A is a plate brush seal single plate 2P of the plate brush seal device 1 showing a fifth embodiment according to the present invention. The plate brush portion 2 a of the plate brush seal single plate 2 </ b> P has a slit 9 formed in an S shape and a linear beam 14 formed from the S shape toward the free end surface 5. The plate brush seal single plate 2P can have a smaller spring constant than the plate brush seal single plate 2P shown in FIG.

  The straight beam 14 enables the rotor 60 to rotate both forward and reverse. That is, it can be used when the rotation direction is not directional and the rotor 60 rotates forward and backward.

A plurality of plate brush seal single plates 2P shown in FIG. 6 (a) are laminated to form a concave layer 12A, and a plurality of plate brush seal single plates 2P shown in FIG. 3 are laminated to form a convex layer 12B. Then, the concave layer 12A and the convex layer 12B are laminated with each other to form an uneven portion 13 on the free end surface 5 of the plate brush seal 2 as shown in FIG.

  Further, in the same laminated state, the concave layer 12A is constituted by the plate brush seal single plate 2P shown in FIG. 6A, and the convex layer 12B is constituted by the plate brush seal single plate 2P shown in FIG. 6B. The uneven portion 13 can be formed on the free end surface 5 of the plate brush seal 2. In this case, it is possible to improve the followability of the pressure contact state with respect to the vibration or swinging of the rotor 60 and prevent the plate brush seal 2 from being worn. The plate brush seal device of FIG. 6B is a sixth embodiment according to the present invention.

  Further, conversely, the concave layer 12A is constituted by the plate brush seal single plate 2P shown in FIG. 6B, and the convex layer 12B is constituted by the plate brush seal single plate 2P shown in FIG. The uneven portion 13 can be formed on the free end surface 5 of the seal 2. In this case, as described above, it can be used for both forward and reverse rotation.

  Furthermore, the plate brush seal single plate 2P in which the concave layer 12A is made of a thin plate with no slit 2P or a plate brush seal single plate 2P in which the slits 9 are provided on the inner peripheral side of the thin plate in the four, six, eight, etc. It can consist of

  Since the concave layer 12A has few slits 9 or no slits are provided, even if a large number of rough slits 9 are received on the convex layer 12B, the concave layer 12A can improve the sealing performance. It becomes possible.

  As described above, the plate brush seal single plate 2P shown in FIG. 3, the plate brush seal single plate 2P shown in FIG. 6A, and the plate brush seal single plate 2P shown in FIG. The uneven portion 13 is formed on the two free end surfaces 5, and the plate brush seal device 1 suitable for the operating state of the rotor 60 can be configured.

  FIG. 7 is a plan view of a plate brush seal device 1 according to a seventh embodiment of the present invention. The plate brush seal unit 2P is formed in an annular shape by combining the divided surfaces 11 of the plate brush seal divided pieces 4 formed in an arc shape. The plate brush seal divided piece 4 is formed by machining a slit 9 on the inner peripheral surface of a thin plate having an arc shape.

  Further, when the plate brush seal divided pieces 4 are arranged in a laminated manner, the divided surface 11 of the adjacent plate brush seal divided pieces 4 are arranged so as to be displaced from each other, so that the divided plate brush seal divided between the divided surfaces 11 is arranged. Since it is sealed by the piece 4, it becomes possible to prevent the sealed fluid from leaking from the dividing surface 11.

  Such a configuration of the brush seal device 1 by combining the plate brush seal divided pieces 4 is effective in terms of cost and assembly in manufacturing the large-diameter plate brush seal device 1.

  Then, a plurality of plate brush seal single plates 2P obtained by annularly combining the plate brush seal divided pieces 4 are formed into a concave layer 12A, and a plurality of plate brush seal single plates 2P having different inner diameters are formed into a plurality of layers. The layer 12B is formed, and the concave layers 12A and the convex layers 12B are alternately laminated to form the uneven portion 13 on the free end surface 5 of the plate brush seal 2 as shown in FIG. By doing so, it becomes possible to manufacture the plate brush seal device 1 of any size regardless of the diameter of the rotor 60.

According to the plate brush seal device according to the embodiment of the present invention, a plurality of plate brush seal single plates having a shape in which one side of a thin plate is processed into a strip shape and a free end surface thereof faces a relative surface of the other component is formed. The plate brush seal single plate is laminated in a single layer or a plurality of layers, one of which is a concave layer having a large inner diameter and the other is formed as a convex layer having a small inner diameter, and the plates having different inner diameters. Since the brush seal single plates are alternately laminated to form an uneven portion on the free end surface, the fluid trying to pass through the uneven surface has a flow expansion loss and a thermodynamic in addition to the viscous resistance. Loss is added and fluid resistance increases.

  Therefore, even if a gap is generated between the free end surface of the plate brush seal and the outer peripheral surface of the rotor, the sealing effect can be exhibited.

  Since both sides of the free end surface of the convex layer are formed as concave surfaces, elastic deformation is possible, and the free end surface can be fitted to the other facing surface in a close state.

Moreover, since the conventional brush seal made of bristles consists of several hundred thousand, the inner peripheral surface had to be processed into a precise circle by wire electric discharge machining or the like. It becomes possible to exert the sealing ability without precisely aligning the free end faces. In addition, since the free end surface of the convex layer is formed with concave surfaces on both sides, flexibility is imparted so that the free end surface can be brought close to the rotor and the sealing ability of the gap with the rotor can be improved. become.

According to the plate brush seal according to the embodiment of the present invention , the convex layer is the other component, for example, in a state close to the rotor, and when the rotor swings and presses against the free end surface of the plate brush seal, Since the slit provided in the convex layer is inclined in the rotation direction of the rotor, the brush portion can be elastically deformed in the rotation direction to weaken the pressure contact force when in the pressure contact state. For this reason, the plate brush seal has an effect of preventing wear due to wear with the rotor.

  In addition, since the concave layer has a slit formed in an S shape, the brush portion having the S shape has a spring constant smaller than that of the inclined brush portion and exhibits an elastic contracting force in the radial direction, and the inclined brush portion. Multiple effects are supported, and the combined effect of followability and sealing ability is achieved.

  In addition, it is possible to cope with the pressure contact of the rotor due to a complicated vibration force with a complex elastic force, and it is possible to effectively exert a sealing effect against the vibration power of the rotor.

According to the plate brush seal according to the embodiment of the present invention , for example, since the slit is inclined in the rotation direction of the rotor, even if it is pressed against the rotor, the slit is elastically bent in the inclined direction to relieve the pressure contact force. Is possible. For this reason, there is an effect of preventing wear due to friction of the plate brush seal.

According to the plate brush seal according to the embodiment of the present invention, since the slits of the plate brush seal single plate intersect in the stacking direction, the gap between the slits is closed by the brush portions adjacent to each other. It can seal effectively by the plate brush seal which comprises plate shape.

According to the plate brush seal concerning the embodiment of the present invention, since the slit of the convex layer is inclined, for example, in the rotation direction of the rotor, it is possible to elastically follow the rotation direction of the rotor. For this reason, there is an effect that wear due to friction is prevented.

  Since the concave plate brush seal single plate is formed into a plate brush seal having no slit or a dimension in which the distance between the slits is large, that is, a dimension in which the width of the brush portion is large, one part The gap between the first part and the other part is surely sealed with the fluid to be sealed by the concave layer. Therefore, the ability to seal the fluid to be sealed by the concave layer as well as the elastic followability by the convex layer exhibits an excellent effect.

1 Plate brush seal device
2 Plate brush seal
2a Board brush part
2b base
2P plate brush seal unit
3 Mounting part
4 plate brush seal split pieces
5 Free end
6 Back plate
6A Adhering part 7 Support surface
8 Brush part
9 Slit
10 Holding part
11 Dividing plane
12A Concave layer
12B Convex layer
13 Concavity and convexity
14 Straight beam
20 Fixed part
50 One part (casing)
51 Cut
60 The other part (rotor)

Claims (5)

A plate brush seal device that is attached to one part between components that rotate relative to each other with a gap and seals between the other parts ,
A thin plate has a plate brush portion formed in a brush portion by providing a slit on the relative surface side of the other component of the thin plate, and an attachment portion comprising a base fixed to the one component on the opposite side of the plate brush portion. A plate brush seal in which a single plate brush seal single plate is laminated;
A back plate portion having a support surface that is coupled to the mounting portion of the plate brush seal and supports a side surface of the plate brush seal;
A holding portion for holding the mounting portion of the plate brush seal with the back plate portion;
The plate brush seal is formed by alternately laminating a plurality of concave and convex plate brush seal single plates in the pressure direction of the sealed fluid so that the concave layer is sandwiched between the convex layers. A plate brush seal device in which an uneven portion is formed on an end surface. The plate brush seal is formed by alternately laminating a concave layer in which a plurality of concave layer plate brush seal single plates are laminated and a convex layer in which a plurality of convex layer brush brush single plates are laminated. 2. The plate brush seal device according to 1.   The plate brush seal device according to claim 1 or 2, wherein the slits are arranged so as to be shifted from each other so as not to form a line in a direction in which the pressure of the sealed fluid acts.   4. The plate brush seal device according to claim 1, wherein the slit is inclined in a direction in which the other part moves. 5. The plate brush seals, the slit of the plate brush seal unit plate, the stacking direction of the plate brush seal unit plate such that a gap of the slit is closed by the brush portion of the plate brush seal unit plate adjacent brush seal device according to any one of claims 1 to 4, wherein the intersecting Oite.

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