JP2022109647A - sealing device - Google Patents

Abstract

To suppress the entry of foreign matters into a space between an outer peripheral face 3e of a rotary shaft 3 and an inner peripheral face 21a of a sleeve 20.SOLUTION: A sealing device 10 includes a sleeve 20 fitted to a rotary shaft 3, an annular first seal 30 arranged on one end side of the sleeve 20 in a center axis direction X of the sleeve 20 for closely contacting an outer peripheral face 21b of the sleeve 20, an annular second seal 40 arranged on the other end side of the sleeve 20 further than the first seal 30 in the center axis direction X of the sleeve 20 for closely contacting the outer peripheral face 21b of the sleeve 20, and an annular third seal 30 arranged at an end 21d on the other end side in the center axis direction X of the sleeve 20 for sealing a space between an outer peripheral face 3e of the rotary shaft 3 and an inner peripheral face 21a of the sleeve 20.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to sealing devices.

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

JP 2020-148223 A JP 2011-163438 A

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, the outer peripheral surface of the rotating shaft may be worn. The present disclosure provides a sealing device capable of suppressing entry of foreign matter into a 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 fitted to the rotating shaft, an annular first seal disposed on one end side of the sleeve in the central axis direction of the sleeve and in close contact with the outer peripheral surface of the sleeve, and , an annular second seal that is arranged on the other end side of the sleeve than the first seal and is in close contact with the outer peripheral surface of the sleeve; an annular third seal that seals a gap between the outer peripheral surface and the inner peripheral surface of the sleeve.

FIG. 4 is a partial cross-sectional view showing the sealing device attached to the roll; It is a fragmentary sectional view showing a sealing device. FIG. 4 is a partial cross-sectional view showing a seal located at the end of the sleeve;

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the dimensions and scale of each part in the drawings are appropriately different from the actual ones. Also, the embodiments described below are preferred specific examples of the present disclosure. Therefore, various technically preferable limitations are applied to the present embodiment. However, the scope of the present disclosure is not limited to these forms unless there is a description to the effect that the present disclosure is particularly limited in the following description.

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

Before describing 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 described with reference to FIG. The sealing device 10 is applied, for example, to the roll 3 of a continuous casting machine. A continuous casting machine rolls while conveying a hot slab. The continuous casting machine comprises, for example, a plurality of segments having pairs of vertically spaced rolls 3 . A plurality of segments are arranged in the transport direction of the slab. By rotating the multiple rolls 3, the slab passes through the space between the upper and lower rolls 3.

Roll 3 is rotatably supported by bearing unit 5 . The bearing units 5 are arranged at both ends in the axial direction X of the roll 3 . The bearing unit 5 may be arranged in an intermediate portion in the axial direction X of the roll 3 .

In the continuous casting machine, the slab is conveyed and rolled while being in contact with the outer peripheral surface 3d of the roll 3. When using a continuous casting machine, there is a risk of scale being generated from the slab. Further, inside the roll 3, a flow path is formed through which cooling water for cooling the roll 3 flows. In the outer space B of the bearing unit 5, foreign matter such as scale and cooling water may exist.

The bearing unit 5 includes bearings 6 that rotatably support 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. As shown in FIG. The bearing 6 is, for example, a roller bearing.

The bearing unit 5 includes a plurality of seal units arranged on both sides of the bearing 6 in the axial direction X. As shown in FIG. In FIG. 1, one seal unit is illustrated. The plurality of seal units includes an end seal unit and a neck seal unit. The sealing device 10 can be used, for example, as a neck sealing unit. The end seal unit is arranged on the end side of the roll 3 in the axial direction X, and the neck seal unit is arranged closer to the area where the slab is conveyed.

The outer diameter of the rolls 3 may differ in the axial direction X. The roll 3 has a plurality of portions with different outer diameters in the axial direction X. As shown in FIG. The roll 3 has a body portion 3a, a portion 3b on which the sealing device 10 is mounted, and a portion 3c supported by the bearings 6. As shown in FIG. The body portion 3a, the portion 3b and the portion 3c are cylindrical and arranged coaxially. An outer peripheral surface 3d of the body portion 3a includes a surface that contacts the slab. The portion 3b to which the sealing device 10 is attached is narrower than the body portion 3a. The portion 3c supported by the bearing 6 is narrower than the portion 3b on which the sealing device 10 is mounted. A chamfer 3f is formed at the corner of the portion 3b.

The housing 7 of the bearing unit 5 includes a bearing housing 8 containing the bearing 6 and a seal housing 9 containing the sealing device 10 . The inner space of the bearing housing 8 and the inner space of the seal housing 9 communicate with each other. The bearing 6 is press-fitted into the bearing housing 8 . The seal housing 9 is fixed with respect to the bearing housing 8 . The inside of the bearing housing 8 is filled with lubricating oil in addition to the bearings 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 9 a is arranged coaxially with the central axis of the roll 3 . The inner diameter of the cylindrical portion 9a is large enough for the sealing device 10 to fit therein. The cylindrical portion 9a has ends 9d and 9e as both ends in the axial direction X. As shown in FIG. The flange 9b protrudes outward in the radial direction Y from the end 9d closer to the bearing 6 . The wall portion 9 c protrudes inward in the radial direction Y from the end portion 9 e farther from the bearing 6 . The wall portion 9c has a disk shape when viewed from the axial direction X. As shown in FIG. An opening 9f penetrating in the axial direction X is formed in 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. FIG. The sealing device 10 separates an internal space A in which the bearing 6 is arranged from an external space B outside the housing 7 . As described above, the internal space A is filled with lubricating oil for the bearing 6, and the external space B may contain foreign matter such as water, dust, and scale. Interior space A includes the interior space of bearing housing 8 . External space B includes the external space of seal housing 9 .

The sealing device 10 comprises a sleeve 20 and seals 30,40,50. Seal 30 is an example of a first seal, seal 40 is an example of a second seal, and seal 50 is an example of a third seal. Sleeve 20 and seal 50 rotate with roll 3 . These rolls 3, sleeves 20 and seals 50 rotate relative to the seals 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 fits onto the roll 3 . The inner peripheral surface 21 a of the sleeve body 21 contacts the outer peripheral surface 3 e of the portion 3 b of the roll 3 . The sleeve body 21 has ends 21c and 21d, which are both ends in the axial direction X. As shown in FIG. The end 21 c is the end closer to the bearing 6 and the end 21 d is the end farther from the bearing 6 . In the axial direction X, the side where the end portion 21c is arranged is the one end side, and the side where the end portion 21d is arranged is the other end side.

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. As shown in FIG. The first surface 22 a is the surface closer to the bearing 6 , and the second surface 22 b is the 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. As shown in FIG.

A concave portion 23 is provided on the inner circumference of the end portion 21d. The recessed portion 23 is recessed in the axial direction X from the end surface 21e of the end portion 21d. The recess 23 is defined by an inner peripheral surface 23a and an end surface 23b. In the radial direction Y, the inner peripheral surface 23a is arranged outside the inner peripheral surface 21a. A gap is formed in the radial direction Y between the inner peripheral surface 23 a and the outer peripheral surface 3 e of the roll 3 . The end surface 23b is located inside the second surface 22b of the flange 22 in the axial direction X. As shown in FIG. A portion of the seal 50 is inserted into this recess 23 .

A taper 21f is formed on the inner peripheral side of the end portion 21c of the sleeve body 21 . In the taper 21 f , the side closer to the bearing 6 is arranged inside in the radial direction Y compared to the side farther from the bearing 6 . This taper 21 f contacts the chamfer 3 f of the roll 3 . When the sleeve 20 is press-fitted onto the roll 3, the taper 21f contacts the chamfer 3f, so positioning of the sealing device 10 relative to the roll 3 is facilitated. Thereby, the sealing device 10 can be accurately arranged with respect to the roll 3 . Since the sleeve 20 has a taper 21f, it also has a detent effect to prevent co-rotation between the sleeve 20 and the roll 3 on the other side. When the tapered surfaces (3f, 21f) come into contact with each other, a wedge-shaped fitting is formed, and co-rotation can be suppressed.

The seal 30 has an annular shape and fits on the outer peripheral side of the sleeve 20 . The seal 30 seals the space between the outer peripheral surface 21 b of the sleeve body 21 and the inner peripheral surface 9 g of the seal housing 9 . Seal 30 comprises a resilient ring 31 and a rigid ring 35 .

The elastic ring 31 is, for example, a rubber ring. The elastic ring 31 is arranged closer to the bearing 6 in the axial direction X. As shown in FIG. In other words, the elastic ring 31 is arranged in the axial direction X closer to the end 21c of the sleeve body 21 . The elastic ring 31 has an outer ring 32 , a connecting portion 33 and an inner ring 34 . The outer ring 32 has a cylindrical shape and includes an outer peripheral surface 32 a that is in close contact with the inner peripheral surface 9 g 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. As shown in FIG.

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

The inner peripheral ring 34 extends in the axial direction X from the connecting portion 33 to the side opposite to the bearing 6 . A space C is formed in the radial direction Y between the outer ring 32 and the inner ring 34 . A groove 34c for holding the garter spring 11 is formed in the outer peripheral surface 34a of the inner peripheral ring 34. As shown in FIG. 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 against the outer peripheral surface 3e of the roll 3 from the radial direction Y outer side.

An inner peripheral surface 34b of the inner peripheral ring 34 is formed with a seal lip 34d. When the seal 30 is not attached to the sleeve 20, the seal lip 34d protrudes radially inward in the Y direction. When the seal 30 is attached to the sleeve 20 , the seal lip 34 d is in close contact with the outer peripheral surface 21 b of the sleeve body 21 .

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

The first cylinder 35b is arranged inside the outer ring 32 in the radial direction Y. As shown in FIG. The outer peripheral surface of the first cylinder 35 b contacts the inner peripheral surface 32 b 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. As shown in FIG. The connecting portion 35c is adjacent to the outer ring 32 in the axial direction X. As shown in FIG. The connecting portion 35 c is arranged 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. As shown in FIG. An end portion 35 e of the second cylinder 35 d opposite to the bearing 6 in the axial direction X contacts the wall portion 9 c of the seal housing 9 . The outer peripheral surface of the second cylinder 35 d may contact the inner peripheral surface 9 g of the cylindrical portion 9 a of the seal housing 9 .

The seal 40 has an annular shape. A cross-section along the axial direction X of the seal 40 has, for example, a rectangular shape. The seal 40 is arranged at a position farther from the bearing 6 in the axial direction X than the seal lip 34d. The seal 40 is arranged in the axial direction X closer to the end 21 d of the sleeve body 21 than the seal 30 is. The inner peripheral surface 40 a of the seal 40 is in close contact with the outer peripheral surface 21 b of the sleeve body 21 . The outer peripheral surface 21 b of the sleeve body 21 slides against the inner peripheral surface 40 a of the seal 40 . The outer peripheral surface 40 b of the seal 40 is arranged inside the outer peripheral surface 22 c of the flange 22 in the radial direction Y. As shown in FIG.

The seal 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 seal 40 may be manufactured using a resin material mixed with glass fiber, graphite, and/or carbon fiber.

The sealing device 10 has retaining rings 12 , 13 which retain a seal 40 . The retaining ring 12 is arranged in the radial direction Y outside the seal 40 . The retaining ring 12 is, for example, a rubber ring. The inner peripheral surface of the retaining ring 12 is in close contact with the outer peripheral surface 40 b of the seal 40 . The outer peripheral surface of the retaining ring 12 is arranged outside the outer peripheral surface 22 c of the flange 22 in the radial direction Y. As shown in FIG.

The retaining ring 13 has an end wall 13a and a cylindrical portion 13b. The retaining 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 that is closer to the bearing 6 . When viewed from the axial direction X, the end wall 13a has a disc shape, and an opening is provided in the center. The end wall 13a can abut on the connecting portion 35c of the rigid ring 35 in the axial direction X. As shown in FIG. The end wall 13a is arranged on the side opposite to the bearing 6 with respect to the connecting portion 35c in the axial direction X. As shown in FIG. The end wall 13 a is arranged in the axial direction X so as to cover the seal 40 and the retaining ring 12 from the side closer to the bearing 6 .

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. As shown in FIG. An end portion 13c of the cylindrical portion 13b in the axial direction X contacts the wall portion 9c. The cylindrical portion 13 b is arranged in the radial direction Y between the retaining ring 12 and the second cylinder 35 d of the rigid ring 35 . The inner peripheral surface of the cylindrical portion 13 b contacts the outer peripheral surface of the retaining ring 12 . The outer peripheral surface of the cylindrical portion 13b contacts the inner peripheral surface of the second cylinder 35d.

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

The seal 50 will now be described with reference to FIG. FIG. 3 is a partial cross-sectional view showing seal 50 located at end 21d of sleeve 20. As shown in FIG. Seal 50 includes boss 51 , extension 52 and peripheral lip 53 . The seal 50 is provided at the end 21d of the sleeve 20 in the axial direction X. As shown in FIG. The seal 50 is arranged in the axial direction X between the sleeve 20 and the wall 9 c of the seal housing 9 . The seal 50 is made of rubber, for example. The seal 50 is applied to the flange 22 of the sleeve 20, for example by baking. Seal 50 may be attached to sleeve 20 by other methods.

The boss 51 is arranged on the inner peripheral side of the seal 50 . The boss 51 is formed with an opening 51a through which the roll 3 is inserted. An inner peripheral surface 51b of the opening 51a includes a lip portion that contacts the outer peripheral surface 3e of the roll 3. As shown in FIG. The inner diameter of the opening 51 a is smaller than the outer diameter of the portion 3 b of the roll 3 . The boss 51 has interference with the roll 3 .

An outer peripheral surface 51c of the boss 51 is inclined with respect to the axial direction X. As shown in FIG. An end face 51d of the boss 51 on the side of the outer space B extends along the radial direction Y. As shown in FIG. A predetermined gap is formed between the end surface 51 d of the boss 51 and the wall portion 9 c of the seal housing 9 .

In addition, an inner peripheral surface 51e of the boss 51 closer to the end surface 51d is inclined with respect to the axial direction X. As shown in FIG. The side of the inner peripheral surface 51e closer to the end face 51d is farther from the outer peripheral face 3e of the roll 3 than the side farther from the end face 51d. A gap may be formed between the end surface 51 d and the outer peripheral surface 3 e of the roll 3 in the radial direction Y.

The boss 51 has a cylindrical portion 54 protruding toward the bearing 6 in the axial direction X. As shown in FIG. The tubular portion 54 is a tubular convex portion that is inserted into the concave portion 23 of the sleeve 20 . An outer peripheral surface 54 a of the tubular portion 54 is in close contact with an inner peripheral surface 23 a of the recess 23 . The end surface 54b of the cylindrical portion 54 is in close contact with the end surface 23b of the recess 23. As shown in FIG. An inner peripheral surface 54c closer to the end surface 54b of the cylindrical portion 54 extends along the axial direction X. As shown in FIG. An inner peripheral surface 54d farther from the end surface 54b of the cylindrical portion 54 is an inclined surface that is inclined with respect to the axial direction X. As shown in FIG. 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 54 d farther from the end surface 54 b contacts the outer peripheral surface 3 e of the roll 3 .

A space E is formed around the roll 3 when the sealing device 10 is attached to the roll 3 . The space E is a space surrounded by the outer peripheral surface 3 e of the roll 3 , the end surface 23 b of the recess 23 of the sleeve 20 , and the inner peripheral surfaces 54 c and 54 d of the seal 50 .

The extending portion 52 projects outward in the radial direction Y from the boss 51 . The extending portion 52 has a disc shape. The thickness direction of the extending portion 52 is along the axial direction X. As shown in FIG. The extending portion 52 includes a first surface 52a and a second surface 52b that are spaced apart from each other in the axial direction X. As shown in FIG. A first surface 52 a of the extension 52 faces the second surface 22 b of the flange 22 . The second surface 52b of the extension 52 is separated from the second surface 22b of the flange 22. As shown in FIG. A space D is formed between the second surface 52b of the extending portion 52 and the wall portion 9c of the seal housing 9 in the axial direction X. As shown in FIG.

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

The connecting portion 53b extends from the outer edge portion 53a in the axial direction X toward the wall portion 9c of the seal housing 9. As shown in FIG. A base end portion of the connecting portion 53b is connected to the outer edge portion 53a, and a distal end portion of the connecting portion 53b is arranged near the wall portion 9c. The tip portion of the connecting portion 53b may be in close contact with the wall portion 9c in the axial direction X. As shown in FIG. The connecting portion 53b is inclined with respect to the axial direction X. As shown in FIG. The distal end portion of the connecting portion 53b is arranged inside in the radial direction Y from the proximal end portion of the connecting portion 53b.

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

Next, a procedure for assembling the sealing device 10 will be described. The following procedures can be interchanged as appropriate. Also, a plurality of procedures may be collectively executed.

First, in procedure A, the seal 40 is press-fitted into the sleeve 20 . Next, in procedure B, the retaining ring 12 is attached to the seal 40 . Next, in procedure C, the retaining ring 13 is put on the retaining ring 12 .

In procedure D, a rigid ring 35 to which the elastic ring 31 is adhered is prepared, and the garter spring 11 is attached to the elastic ring 31 . By performing the procedure D, an intermediate part with the garter spring 11 attached to the seal 30 is produced.

In procedure E, the seal 30 is press-fitted into the sleeve 20 . In procedure F, the seal 50 is attached to the sleeve 20 . Thereby, the sealing device 10 is assembled.

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

In procedure H, the sealing device 10 and the seal housing 9 are pressed against the roll 3 . By performing these steps, the sealing device 10 is attached to the roll 3 .

Such a sealing device 10 includes a sleeve 20 mounted on the roll 3, and a seal 50 is provided at an end portion 21d of the sleeve body 21. As shown in FIG. Sleeve 20 and seal 50 are mounted on roll 3 and rotate with roll 3 . The outer peripheral surface 21 b of the sleeve main body 21 slides relative to the seals 30 and 40 .

For example, it is impractical to replace the roll 3 when it wears out. If the outer peripheral surface 3e of the roll 3 wears out significantly, the maintenance cost may increase. However, according to the sealing device 10, the sleeve 20 is arranged between the outer peripheral surface 3e of the roll 3 and the seals 30, 40 in the radial direction Y. wears out. Therefore, wear of the roll 3 is suppressed. When the sleeve body 21 wears out, the sleeve 20 can be removed from the roll 3 and a new sleeve 20 can be attached to the roll 3 . As a result, while maintaining the sealing performance of the sealing device 10, damage to the roll 3 can be prevented, and an increase in maintenance cost can be suppressed.

Furthermore, in the sealing device 10, since the seal 50 is arranged at the end portion 21d of the sleeve 20, the gap between the outer peripheral surface 3e of the roll 3 and the inner peripheral surface 21a of the sleeve body 21 is sealed. Therefore, foreign matter existing in the outer space B is suppressed from entering the gap between the roll 3 and the sleeve 20 .

In the sealing device 10, a recess 23 is formed in the end portion 21d of the sleeve 20, and a space E is formed in the recess 23. As shown in FIG. Thus, even if foreign matter enters through the gap between the roll 3 and the seal 50, the foreign matter is held in the space E. Therefore, entry of foreign matter into the gap between the roll 3 and the sleeve 20 can be delayed.

Further, 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 22 b of the flange 22 . As a result, the end surface 51 d of the boss 51 is arranged near the wall portion 9 c of the seal housing 9 . Therefore, the gap between the end face 51d and the wall portion 9c is appropriately maintained, and the entry of foreign matter existing in the external space B into the space D is suppressed by the labyrinth effect.

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

Further, in the sealing device 10, the connecting portion 53b that supports the lip portion 53c is inclined inward in the radial direction Y. As shown in FIG. As a result, in the radial direction Y, the lubricating oil existing outside the seal 50 can easily flow inward. Since the lubricating oil flows from the outer peripheral side to the inner peripheral side of the seal 50, foreign matter flows together with the lubricating oil. Therefore, entry of foreign matter from the inner peripheral side of the seal 50 to the outer peripheral side is suppressed.

It should be noted that the above-described embodiment merely shows a representative form of the present invention, and the present disclosure is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present disclosure. Changes and additions are possible.

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 being applied to a continuous casting machine, and can be applied to other devices having a rotating shaft. Applicable.

3... Roll (rotating shaft), 3e... Outer peripheral surface of roll (outer peripheral surface of rotating shaft), 10... Sealing device, 20... Sleeve, 21... Sleeve main body, 21a... Inner peripheral surface of sleeve main body (inner peripheral surface of sleeve ), 21b... outer peripheral surface of the sleeve body (outer peripheral surface of the sleeve), 21d... end (end on the other end side), 22... flange, 23... concave portion, 30... seal (first seal), 40... seal ( Second seal), 40b... Outer peripheral surface of seal (outer peripheral surface of second seal), 50... Seal (third seal), 51... Boss, 52... Extension part, 54... Cylindrical part (convex part), 54d... Inner peripheral surface (inclined surface), X... axial direction (central axis direction), Y... radial direction.

Claims (7)

a sleeve fitted to the rotating shaft;
an annular first seal disposed on one end side of the sleeve in the central axis direction of the sleeve and in close contact with the outer peripheral surface of the sleeve;
an annular second seal disposed closer to the other end side of the sleeve than the first seal in the central axis direction of the sleeve and in close contact with the outer peripheral surface of the sleeve;
an annular third seal disposed at the end on the other end side in the central axis direction of the sleeve and sealing a gap between the outer peripheral surface of the rotating shaft and the inner peripheral surface of the sleeve; A sealing device provided. The sleeve includes a tubular sleeve body fitted to the rotating shaft;
a flange disposed on the other end side in the central axis direction of the sleeve and projecting from the sleeve main body to the outside in the radial direction of the sleeve;
A sealing device according to claim 1 . The flange protrudes outward from the outer peripheral surface of the second seal in the radial direction of the sleeve,
The sealing device according to claim 2. A recess recessed in the direction of the central axis is formed on the other end side of the sleeve,
The third seal has an annular protrusion inserted into the recess,
The sealing device according to any one of claims 1-3. The inner peripheral surface of the protrusion of the third seal includes an inclined surface separated from the outer peripheral surface of the rotating shaft,
The sealing device according to claim 4. The third seal is
a boss disposed on the inner peripheral side of the third seal and fitted to the rotating shaft;
an extension extending radially outward from the boss;
a lip portion extending outward in the central axis direction from the outer peripheral side of the extending portion;
The sealing device according to any one of claims 1-4. the boss protrudes outward in the direction of the central axis;
A sealing device according to claim 6 .

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