KR102626375B1 - Sealing device - Google Patents

Abstract

Foreign matter is suppressed from entering the gap between the outer peripheral surface 3e of the rotating shaft 3 and the inner peripheral surface 21a of the sleeve 20. The sealing device 10 includes a sleeve 20 inserted into the rotating shaft 3, and is disposed on one end of the sleeve 20 in the central axis direction (X) of the sleeve 20, and the outer peripheral surface of the sleeve 20 ( an annular first seal 30 in close contact with 21b), and disposed on the other end of the sleeve 20 rather than the first seal 30 in the central axis direction (X) of the sleeve 20, An annular second seal 40 in close contact with the outer peripheral surface 21b of the sleeve 20 is disposed at the end 21d on the other end side in the central axis direction (X) of the sleeve 20, and a rotation axis 3 ) and an annular third seal 30 that seals the gap between the outer peripheral surface 3e of the sleeve 20 and the inner peripheral surface 21a of the sleeve 20.

Description

Sealing device{SEALING DEVICE}

This disclosure relates to a sealing device.

There is a sealing device including a bearing-side seal member and an outer-side seal member that are in close contact with the outer peripheral surface of a rotating shaft (see, for example, Patent Document 1). Additionally, there is a sealing device that includes a sleeve inserted into a rotating shaft and a seal member in close contact with the outer peripheral surface of the sleeve (see, for example, Patent Document 2).

Japanese Patent Publication No. 2020-148223 Japanese Patent Publication No. 2011-163438

If foreign matter such as water or scale enters the gap between the outer peripheral surface of the rotating shaft and the inner peripheral surface of the sleeve, there is a risk that the outer peripheral surface of the rotating shaft may be worn. The present disclosure provides a sealing device capable of suppressing foreign matter from entering the gap between the outer peripheral surface of the rotating shaft and the inner peripheral surface of the sleeve.

The sealing device of the present disclosure includes a sleeve inserted into a rotating shaft, an annular first seal disposed on one end of the sleeve in the direction of the central axis of the sleeve, and in close contact with the outer peripheral surface of the sleeve, and a central axis of the sleeve. In this direction, the annular second thread is disposed on the other end side of the sleeve rather than the first thread and is in close contact with the outer peripheral surface of the sleeve; It is provided with an annular third seal that seals the gap therebetween.

1 is a partial cross-sectional view showing a sealing device mounted on a roll.
Figure 2 is a partial cross-sectional view showing the sealing device.
Figure 3 is a partial cross-sectional view showing the thread disposed at the end of the sleeve.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this disclosure will be described with reference to the drawings. Additionally, the dimensions and scale of each part in the drawings are appropriately different from the actual ones. In addition, the embodiment described below is a suitable specific example of the present disclosure. For this reason, various technically desirable limitations are attached to this embodiment. However, the scope of the present disclosure is not limited to these forms, unless specifically stated in the following description to the effect of limiting the present disclosure.

1 is a partial cross-sectional view showing the sealing device 10 mounted on the roll 3. Figure 2 is a cross-sectional view showing the sealing device 10. In each figure, the axial direction (X) and radial direction (Y) are indicated by arrows. The axial direction (X) is the direction in which the central axis of the roll (3) extends. The radial direction (Y) is the radial direction of the roll (3). Roll 3 is an example of a rotating shaft.

Before explaining the sealing device 10, the roll 3 to which the sealing device 10 is applied and the bearing unit 5 that rotatably supports the roll 3 will be explained with reference to FIG. 1. . The sealing device 10 is applied to the roll 3 of a continuous casting machine, for example. A continuous casting machine rolls a high-temperature slab while conveying it. A continuous casting machine is provided with a plurality of segments having, for example, a pair of rolls 3 spaced apart in the vertical direction. A plurality of segments are aligned in the transport direction of the slab. As the plurality of rolls 3 rotate, the slab passes through this space between the upper and lower rolls 3.

The roll (3) is rotatably supported by a bearing unit (5). Bearing units 5 are disposed at both ends of the roll 3 in the axial direction (X). The bearing unit 5 may be disposed in the middle portion of the roll 3 in the axial direction (X).

In a continuous casting machine, the slab is conveyed and rolled while contacting the outer peripheral surface 3d of the roll 3. When using a continuous casting machine, there is a risk that scale may form from the slab. In addition, a flow path through which cooling water for cooling the roll 3 flows is formed inside the roll 3. There is a risk that foreign substances such as scale and coolant may exist in the external space (B) of the bearing unit (5).

The bearing unit 5 has a bearing 6 that rotatably supports the roll 3. The sealing device 10 is mounted on the bearing unit 5. The sealing device 10 is adjacent to the bearing 6 in the axial direction (X). The bearing 6 is, for example, a roller bearing.

The bearing unit 5 has a plurality of seal units arranged on both sides of the bearing 6 in the axial direction (X). In Figure 1, one seal unit is shown. The plurality of seal units include an end seal unit and a neck seal unit. The sealing device 10 can be used as a neck seal unit, for example. The end seal unit is disposed on the end side of the roll 3 in the axial direction (X), and the neck seal unit is disposed on the side close to the area where the slab is conveyed.

The outer diameters of the rolls (3) may be different in the axial direction (X). The roll 3 has a plurality of parts with different outer diameters in the axial direction (X). The roll 3 has a main body portion 3a, a portion 3b on which the sealing device 10 is mounted, and a portion 3c supported by a bearing 6. The main body part 3a, part 3b and part 3c are cylindrical and arranged on the same axis. The outer peripheral surface 3d of the main body portion 3a includes a surface in contact with the slab. The portion 3b on which the sealing device 10 is mounted is thinner than the main body portion 3a. The portion 3c supported by the bearing 6 is thinner than the portion 3b on which the sealing device 10 is mounted. Additionally, a chamfer 3f is formed at the edge of the portion 3b.

The housing 7 of the bearing unit 5 includes a bearing housing 8 that accommodates the bearing 6 and a seal housing 9 that accommodates the sealing device 10. The inner space of the bearing housing (8) and the inner space of the seal housing (9) are in communication with each other. The bearing (6) is press-fitted into the bearing housing (8). The seal housing (9) is fixed to the bearing housing (8). The inside of the bearing housing 8 is filled with lubricating oil in addition to the bearing 6.

The seal housing 9 has a cylindrical portion 9a, a flange 9b, and a wall portion 9c. The central axis of the cylindrical portion 9a is disposed on the same axis as the central axis of the roll 3. The inner diameter of the cylindrical portion 9a is a size into which the sealing device 10 is inserted. The cylindrical portion 9a has end portions 9d and 9e as both ends in the axial direction (X). The flange 9b protrudes outward in the radial direction Y from the end 9d on the side closer to the bearing 6. The wall portion 9c protrudes inward in the radial direction Y from the end portion 9e farthest from the bearing 6. The wall portion 9c has a disk shape when viewed in the axial direction (X). An opening 9f penetrating in the axial direction (X) is formed at the center of the wall portion 9c. The roll 3 is inserted through the opening 9f.

Next, the sealing device 10 will be described with reference to FIGS. 1 to 3. The sealing device 10 isolates the internal space A, where the bearing 6 is disposed, from the external space B outside the housing 7. As described above, the internal space (A) is filled with lubricating oil for the bearing 6, and there is a risk that foreign substances such as water, dust, and scale may be present in the external space (B). The internal space (A) includes the internal space of the bearing housing (8). The external space (B) includes the external space of the actual housing (9).

The sealing device 10 includes a sleeve 20 and seals 30, 40, and 50. Yarn 30 is an example of a first yarn, yarn 40 is an example of a second yarn, and yarn 50 is an example of a third yarn. The sleeve 20 and the yarn 50 rotate together with the roll 3. These rolls 3, sleeves 20, and yarns 50 rotate relative to the yarns 30, 40.

The sleeve 20 has a sleeve body 21 and a flange 22. The sleeve body 21 has a cylindrical shape. The sleeve body 21 is inserted into the roll 3. The inner peripheral surface 21a of the sleeve body 21 contacts the outer peripheral surface 3e of the portion 3b of the roll 3. The sleeve body 21 has end portions 21c and 21d, which are both ends in the axial direction (X). The end 21c is the end closer to the bearing 6, and the end 21d is the end farther from the bearing 6. In the axial direction

The flange 22 protrudes outward in the radial direction (Y) from the end portion 21d. The flange 22 includes a first surface 22a and a second surface 22b spaced apart from each other in the axial direction (X). The first surface 22a is a surface closer to the bearing 6, and the second surface 22b is a surface farther from the bearing 6. The second surface 22b faces the wall portion 9c of the seal housing 9 in the axial direction (X).

A concave portion 23 is provided on the inner periphery of the end portion 21d. The concave portion 23 is concave in the axial direction (X) from the end surface 21e of the end portion 21d. The concave portion 23 is defined by an inner peripheral surface 23a and a cross section 23b. In the radial direction Y, the inner peripheral surface 23a is disposed outside the inner peripheral surface 21a. In the radial direction Y, a gap is formed between the inner peripheral surface 23a and the outer peripheral surface 3e of the roll 3. The end surface 23b is located inside the second surface 22b of the flange 22 in the axial direction (X). A part of the thread 50 is inserted into this concave portion 23.

Additionally, a taper 21f is formed on the inner peripheral side of the end portion 21c of the sleeve main body 21. In the taper 21f, the side closer to the bearing 6 is disposed inside in the radial direction Y compared to the side farther from the bearing 6. This taper 21f contacts the chamfer 3f of the roll 3. When the sleeve 20 is press-fitted against the roll 3, the taper 21f touches the chamfer 3f, so positioning the sealing device 10 with respect to the roll 3 becomes easy. As a result, the sealing device 10 can be positioned accurately with respect to the roll 3. Since the sleeve 20 has a taper 21f, it also has a rotation prevention effect by preventing co-rotation of the sleeve 20 and the roll 3 on the other side. When the tapered surfaces 3f and 21f come into contact with each other, a wedge-shaped fit is formed, and simultaneous rotation can be suppressed.

The thread 30 forms an annular shape and is inserted into the outer peripheral side of the sleeve 20. The seal 30 seals the space between the outer peripheral surface 21b of the sleeve body 21 and the inner peripheral surface 9g of the seal housing 9. The seal 30 has an elastic ring 31 and a rigid ring 35.

The elastic ring 31 is, for example, a rubber ring. The elastic ring 31 is arranged on the side closer to the bearing 6 in the axial direction (X). In other words, the elastic ring 31 is disposed on the side closer to the end 21c of the sleeve body 21 in the axial direction (X). The elastic ring 31 has an outer ring 32, a connecting portion 33, and an inner ring 34. The outer peripheral ring 32 has a cylindrical shape and includes an outer peripheral surface 32a that is in close contact with the inner peripheral surface 9g of the seal housing 9. The outer ring 32 has a predetermined width in the axial direction (X) and a predetermined thickness in the radial direction (Y).

The connecting portion 33 connects the outer ring 32 and the inner ring 34 in the radial direction (Y). The connecting portion 33 protrudes inward in the radial direction Y from the end portion 32c of the outer ring 32 on the bearing 6 side. The inner peripheral side of the connecting portion 33 is connected to the inner peripheral ring 34. A groove 33a is formed on the inner surface of the connecting portion 33 into which a portion of the rigid ring 35 is inserted. The inner side of the connecting portion 33 is on the opposite side from the bearing 6 in the axial direction (X).

The inner peripheral ring 34 extends in the axial direction (X) from the connecting portion 33 to the side opposite to the bearing 6. In the radial direction Y, a space C is formed between the outer ring 32 and the inner ring 34. A groove 34c for holding the garter spring 11 is formed on the outer peripheral surface 34a of the inner peripheral ring 34. The garter spring 11 has an annular shape and is mounted in the groove 34c. The garter spring 11 presses the inner peripheral ring 34 to the outer peripheral surface 3e of the roll 3 from the outside in the radial direction (Y).

A lip seal 34d is formed on the inner peripheral surface 34b of the inner peripheral ring 34. In the state where the seal 30 is not mounted on the sleeve 20, the lip seal 34d protrudes inward in the radial direction Y. With the seal 30 mounted on the sleeve 20, the lip seal 34d is in close contact with the outer peripheral surface 21b of the sleeve main body 21.

The rigid ring 35 is made of metal, for example, and has a certain strength. The rigid ring 35 has an end wall 35a, a first cylinder 35b, a connecting portion 35c, and a second cylinder 35d. These end walls 35a, the first cylinder 35b, the connecting portion 35c, and the second cylinder 35d are arranged in this order on the side closer to the bearing 6 in the axial direction X. The end wall 35a protrudes inward in the radial direction (Y) from the first cylinder 35b. The end of the inner peripheral side of the end wall 35a is inserted into the groove 33a of the elastic ring 31.

The first cylinder 35b is disposed inside the outer peripheral ring 32 in the radial direction Y. The outer peripheral surface of the first cylinder 35b contacts the inner peripheral surface 32b of the outer peripheral ring 32. The connecting portion 35c protrudes outward in the radial direction (Y) from the first cylinder 35b. The connecting portion 35c connects the first cylinder 35b and the second cylinder 35d in the radial direction (Y). The connecting portion 35c is adjacent to the outer peripheral ring 32 in the axial direction (X). The connecting portion 35c is disposed on the side opposite to the bearing 6 with respect to the outer peripheral ring 32.

The second cylinder 35d extends from the outer peripheral side of the connecting portion 35c to the side opposite to the bearing 6 in the axial direction (X). In the axial direction The outer peripheral surface of the second cylinder 35d may be in contact with the inner peripheral surface 9g of the cylindrical portion 9a of the seal housing 9.

The thread 40 forms an annular shape. The cross section along the axial direction (X) of the thread 40 forms, for example, a rectangular shape. The seal 40 is disposed in a position further away from the bearing 6 than the lip seal 34d in the axial direction (X). The seal 40 is disposed closer to the end 21d of the sleeve main body 21 than the seal 30 in the axial direction (X). The inner peripheral surface 40a of the thread 40 is in close contact with the outer peripheral surface 21b of the sleeve main body 21. The outer peripheral surface 21b of the sleeve body 21 slides with respect to the inner peripheral surface 40a of the thread 40. The outer peripheral surface 40b of the seal 40 is disposed inside the outer peripheral surface 22c of the flange 22 in the radial direction Y.

The thread 40 is made of a resin material that has a small coefficient of friction and is harder than elastomer. Examples of such resin materials include polyetheretherketone (PEEK), polyphenylene sulfide (PPS), and polytetrafluoroethylene (PTFE). The yarn 40 can also be manufactured using a material that mixes a resin material with glass fiber, graphite, and/or carbon fiber.

The sealing device 10 has snap rings 12 and 13 that secure the seal 40 so that it does not fall out. The snap ring 12 is arranged outside the seal 40 in the radial direction Y. The snap ring 12 is, for example, a rubber ring. The inner peripheral surface of the snap ring 12 is in close contact with the outer peripheral surface 40b of the seal 40. The outer peripheral surface of the snap ring 12 is disposed outside the outer peripheral surface 22c of the flange 22 in the radial direction Y.

The snap ring 13 has an end wall 13a and a cylindrical portion 13b. The snap ring 13 is made of metal, for example. The end wall 13a protrudes inward in the radial direction Y from the end of the cylindrical portion 13b on the side closer to the bearing 6. When viewed in the axial direction (X), the end wall 13a has a disk shape, and an opening is provided in the center. The end wall 13a is contactable with the connecting portion 35c of the rigid ring 35 in the axial direction (X). The end wall 13a is disposed on the side opposite to the bearing 6 with respect to the connecting portion 35c in the axial direction (X). The end wall 13a is arranged to cover the seal 40 and the snap ring 12 from the side closest to the bearing 6 in the axial direction X.

The cylindrical portion 13b extends in the axial direction (X) from the outer peripheral side of the end wall 13a toward the wall portion 9c of the seal housing 9. The end portion 13c of the cylindrical portion 13b in the axial direction (X) contacts the wall portion 9c. The cylindrical portion 13b is disposed between the snap ring 12 and the second cylinder 35d of the rigid ring 35 in the radial direction Y. The inner peripheral surface of the cylindrical portion 13b is in contact with the outer peripheral surface of the snap ring 12. The outer peripheral surface of the cylindrical portion 13b is in contact with the inner peripheral surface of the second cylinder 35d.

The rigid ring 35 is supported by the elastic ring 31, and the rigid ring 35 constrains the position of the snap ring 13 in the radial direction Y. The seal 40 is pressed inward in the radial direction (Y) by the snap ring 12. The thread 40 is pressed against the outer peripheral surface 21b of the sleeve body 21.

Next, the yarn 50 will be described with reference to FIG. 3 . Figure 3 is a partial cross-sectional view showing the thread 50 disposed at the end 21d of the sleeve 20. The thread 50 has a boss 51, an extension 52, and an outer lip 53. The seal 50 is installed at the end 21d of the sleeve 20 in the axial direction (X). The seal 50 is disposed between the sleeve 20 and the wall portion 9c of the seal housing 9 in the axial direction (X). The thread 50 is made of, for example, rubber. The seal 50 is applied to the flange 22 of the sleeve 20, for example, by baking. The seal 50 may be mounted to the sleeve 20 by other methods.

The boss 51 is arranged on the inner peripheral side of the thread 50. The boss 51 is formed with an opening 51a into which the roll 3 is inserted. The inner peripheral surface 51b of the opening 51a includes a lip portion in close contact with the outer peripheral surface 3e of the roll 3. The inner diameter of the opening 51a is smaller than the outer diameter of the portion 3b of the roll 3. Boss 51 has a tightening margin with respect to roll 3.

The outer peripheral surface 51c of the boss 51 is inclined with respect to the axial direction (X). The cross section 51d of the boss 51 on the external space (B) side follows the radial direction (Y). A predetermined gap is formed between the end surface 51d of the boss 51 and the wall portion 9c of the seal housing 9.

Additionally, the inner peripheral surface 51e of the boss 51 closer to the end surface 51d is inclined with respect to the axial direction X. The side of the inner peripheral surface 51e closer to the end surface 51d is further away from the outer peripheral surface 3e of the roll 3 than the side farther from the end surface 51d. In the radial direction Y, a gap may be formed between the end surface 51d and the outer peripheral surface 3e of the roll 3.

The boss 51 has a barrel portion 54 that protrudes toward the bearing 6 in the axial direction (X). The cylindrical portion 54 is a cylindrical convex portion inserted into the concave portion 23 of the sleeve 20. The outer peripheral surface 54a of the cylinder portion 54 is in close contact with the inner peripheral surface 23a of the concave portion 23. The end face 54b of the cylinder portion 54 is in close contact with the end face 23b of the concave portion 23. The inner peripheral surface 54c on the side closer to the end surface 54b of the cylinder portion 54 follows the axial direction (X). The inner peripheral surface 54d farthest from the end face 54b of the cylinder 54 is an inclined surface inclined with respect to the axial direction X. The side of the inner peripheral surface 54d farther from the end surface 54b is closer to the outer peripheral surface 3e of the roll 3 than the side closer to the end surface 54b. The end of the inner peripheral surface 54d farther from the end surface 54b is in close contact with the outer peripheral surface 3e of the roll 3.

When the sealing device 10 is mounted on the roll 3, a space E is formed around the roll 3. The space E is a space surrounded by the outer peripheral surface 3e of the roll 3, the end surface 23b of the concave portion 23 of the sleeve 20, and the inner peripheral surface 54c and 54d of the yarn 50.

The extension portion 52 protrudes outward from the boss 51 in the radial direction (Y). The extension portion 52 has a disk shape. The thickness direction of the extension portion 52 is along the axial direction (X). The extension portion 52 includes a first surface 52a and a second surface 52b spaced apart from each other in the axial direction (X). The first face 52a of the extension 52 faces the second face 22b of the flange 22. The second surface 52b of the extension portion 52 is spaced apart from the second surface 22b of the flange 22. In the axial direction

The outer peripheral lip 53 has an outer edge portion 53a, a connecting portion 53b, and a lip portion 53c. The outer edge portion 53a protrudes from the outer periphery of the extension portion 52 toward the wall portion 9c of the seal housing 9 in the axial direction (X). The outer edge portion 53a is formed over the entire circumference of the outer peripheral lip 53. The outer peripheral lip 53 may include an outer peripheral portion 53d extending from the outer periphery of the extension portion 52 in the axial direction (X) to the side opposite to the wall portion 9c of the seal housing 9. For example, this outer peripheral portion 53d may be formed to cover the outer peripheral surface 22c of the flange 22.

The connecting portion 53b extends from the outer edge portion 53a toward the wall portion 9c of the seal housing 9 in the axial direction (X). The proximal end of the connecting portion 53b is connected to the outer edge portion 53a, and the distal end of the connecting portion 53b is disposed near the wall portion 9c. The distal end of the connecting portion 53b may be in close contact with the wall portion 9c in the axial direction (X). The connection portion 53b is inclined with respect to the axial direction (X). The distal end of the connecting portion 53b is disposed inside the proximal end of the connecting portion 53b in the radial direction Y.

The lip portion 53c protrudes inward in the radial direction (Y) from the distal end of the connecting portion 53b. The lip portion 53c is in close contact with the wall portion 9c in the axial direction (X). The seal 50 seals the space between the second surface 22b of the flange 22 and the wall portion 9c in the axial direction (X).

Next, the assembly steps of the sealing device 10 will be described. The following steps can be performed with appropriate modifications. Additionally, multiple steps can be executed together.

First, in step (A), the thread 40 is press-fitted into the sleeve 20. Next, in step (B), the snap ring 12 is mounted on the seal 40. Next, in step (C), the snap ring 13 is covered with the snap ring 12.

In step (D), the elastic ring 31 is prepared by attaching it to the rigid ring 35, and the garter spring 11 is mounted on the elastic ring 31. By carrying out step (D), an intermediate part is created in which the thread 30 is equipped with a garter spring 11.

In step (E), the thread 30 is press-fitted into the sleeve 20. In step (F), the seal 50 is attached to the sleeve 20. Thereby, the sealing device 10 can be assembled.

In step (G), the sealing device 10 is press-fitted into the seal housing 9.

In step (H), the sealing device 10 and the seal housing 9 are press-fitted into the roll 3. By carrying out these, the sealing device 10 is mounted relative to the roll 3.

This sealing device 10 is provided with a sleeve 20 mounted on a roll 3, and a seal 50 is installed at the end 21d of the sleeve body 21. The sleeve 20 and the thread 50 are mounted on the roll 3 and rotate together with the roll 3. The outer peripheral surface 21b of the sleeve body 21 slides relative to the yarn 30 and the yarn 40.

For example, if the roll 3 is worn, it is not practical to replace the roll 3. If the outer peripheral surface 3e of the roll 3 is significantly worn, there is a risk that maintenance costs will increase. However, according to the sealing device 10, the sleeve 20 is disposed between the outer peripheral surface 3e of the roll 3 and the seals 30 and 40 in the radial direction Y, so that the roll 3 First of all, the sleeve body 21 is worn. Therefore, wear of the roll 3 is suppressed. When the sleeve body 21 is worn, the sleeve 20 can be removed from the roll 3 and a new sleeve 20 can be mounted on the roll 3. As a result, damage to the roll 3 can be prevented while maintaining the sealing performance of the sealing device 10, and an increase in maintenance cost can be suppressed.

In addition, in the sealing device 10, since the seal 50 is disposed at the end 21d of the sleeve 20, there is a gap between the outer peripheral surface 3e of the roll 3 and the inner peripheral surface 21a of the sleeve main body 21. The gap is sealed. Accordingly, foreign matter existing in the external space B is prevented from entering the gap between the roll 3 and the sleeve 20.

In the sealing device 10, a concave portion 23 is formed at the end 21d of the sleeve 20, and a space E is formed in this concave portion 23. As a result, even if foreign matter invades through the gap between the roll 3 and the thread 50, the foreign matter stays in the space E. Therefore, it is possible to delay the entry of foreign matter into the gap between the roll 3 and the sleeve 20.

Additionally, in the sealing device 10, the boss 51 of the seal 50 is formed to protrude outward in the axial direction X from the second surface 22b of the flange 22. Thereby, the end surface 51d of the boss 51 is disposed near the wall portion 9c of the seal housing 9. Accordingly, the gap between the end surface 51d and the wall portion 9c is maintained appropriately, and foreign matter existing in the external space B is suppressed from entering the space D due to the labyrinth effect.

In the sealing device 10, since the lip portion 53c is provided on the seal 50, the lip portion 53c is in close contact with the wall portion 9c of the seal housing 9 and prevents foreign matter from entering the interior of the sealing device 10. invasion is suppressed. As a result, wear of the seals 30 and 40 can be prevented and the lifespan of the seals 30 and 40 can be extended.

Additionally, in the sealing device 10, the connecting portion 53b supporting the lip portion 53c is inclined inward in the radial direction (Y). This makes it easy for the lubricating oil existing on the outside of the seal 50 to flow inward in the radial direction Y. Since the lubricating oil flows from the outer peripheral side of the seal 50 to the inner peripheral side, foreign matter flows with the lubricating oil. Therefore, the intrusion of foreign matter from the inner circumference side of the seal 50 to the outer circumference side is suppressed.

In addition, the above-described embodiments only show representative forms of the present invention, and the present disclosure is not limited to the above-described embodiments, and various changes and additions are possible without departing from the gist of the present disclosure. .

In the above-described embodiment, application of the sealing device 10 to a continuous casting machine is described, but the sealing device 10 is not limited to application to a continuous casting machine and can be applied to other devices having a rotating shaft.

3: Roll (rotation axis)
3e: Outer surface of the roll (outer surface of the rotation axis)
10: Sealing device
20: sleeve
21: sleeve body
21a: Inner peripheral surface of the sleeve body (inner peripheral surface of the sleeve)
2lb: Outer circumference of the sleeve body (outer circumference of the sleeve)
21d: End (end of the other end)
22: Flange
23: recess
30: Yarn (1st yarn)
40: Yarn (2nd yarn)
40b: Outer peripheral surface of the yarn (outer peripheral surface of the second yarn)
50: Yarn (3rd yarn)
51: Boss
52: extension part
54: Thick part (convex part)
54d: Inner surface (slope)
X: Axial direction (center axis direction)
Y: Radial direction

Claims (9)

A sleeve inserted into the rotating shaft,
an annular first seal disposed at one end of the sleeve in the direction of the central axis of the sleeve and in close contact with the outer peripheral surface of the sleeve;
an annular second thread disposed closer to the other end of the sleeve than the first thread in the direction of the central axis of the sleeve and in close contact with the outer peripheral surface of the sleeve;
an annular third seal disposed at an end of the other end in the direction of the central axis of the sleeve and sealing the gap between the outer peripheral surface of the rotation shaft and the inner peripheral surface of the sleeve;
The third thread includes a portion that covers the cross section of the other end of the sleeve,
Sealing device. According to claim 1,
The sleeve includes a cylindrical sleeve body inserted into the rotating shaft,
A sealing device comprising a flange disposed on the other end side in the direction of the central axis of the sleeve and protruding from the sleeve body to a radial outer side of the sleeve. According to clause 2,
The sealing device wherein the flange protrudes outward from the outer peripheral surface of the second seal in the radial direction of the sleeve. According to any one of claims 1 to 3,
A concave portion concave in the direction of the central axis is formed on the other end side of the sleeve,
A sealing device wherein the third seal has an annular convex portion inserted into the concave portion. According to clause 4,
A sealing device wherein the inner peripheral surface of the convex portion of the third seal includes an inclined surface spaced apart from the outer peripheral surface of the rotating shaft. According to any one of claims 1 to 3,
The third chamber above is,
a boss disposed on an inner peripheral side of the third seal and inserted into the rotation shaft;
an extension extending radially outward from the boss;
A sealing device comprising a lip portion extending outward in the direction of the central axis from an outer peripheral side of the extension portion. According to clause 6,
The boss is a sealing device that protrudes outward in the direction of the central axis. According to clause 6,
A concave portion concave in the direction of the central axis is formed on the other end side of the sleeve,
A sealing device wherein the third seal has an annular convex portion inserted into the concave portion. According to clause 8,
A sealing device wherein the inner peripheral surface of the convex portion of the third seal includes an inclined surface spaced apart from the outer peripheral surface of the rotating shaft.

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