JP4295487B2 - Sealing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing device that prevents leakage of sealing fluid, and more particularly to a sealing device that can prevent leakage of sealing fluid in a non-contact manner by rotation of a rotating body.
[0002]
[Prior art]
Conventionally, as a sealing device for preventing leakage of a sealing fluid, a labyrinth seal has been known in which a sealing gap is provided between a rotating body and a stationary part, and leakage of the sealing fluid can be prevented without contact by rotation of the rotating body. It has been. This labyrinth seal is particularly suitable for preventing oil leakage at a site where low torque is required, and is used in, for example, a turbocharger (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 5-1559.
[0004]
[Problems to be solved by the invention]
By the way, in the conventional labyrinth seal described above, in order to prevent oil leakage during rotation of the rotating body (substantially negligible), it is necessary to narrow the seal gap and reduce the variation, that is, to manage precisely. is there. Further, in order to prevent oil leakage during rotation, it is necessary to narrow the seal gap as the rotational speed increases. For example, when the rotational speed of the rotator is 8000 rpm, it is necessary to form a seal gap provided between the rotator and the stationary part to about 0.1 mm.
[0005]
However, in order to form a seal gap of 0.1 mm in the conventional labyrinth seal, it is necessary to extremely increase the processing accuracy of the labyrinth seal itself and the mounting accuracy of the labyrinth seal. In order to increase the processing accuracy of the labyrinth seal, a high-precision device is required, and in order to manufacture a large amount of the labyrinth seal produced by such a device, an extremely large amount of device and space are required. The production efficiency is poor and the economic burden increases. Furthermore, in order to increase the mounting accuracy of the labyrinth seal, a high-accuracy mounting device is required, which has the problem that the production efficiency is poor and the economic burden increases.
[0006]
Therefore, there is a need for a sealing device that can prevent leakage of the sealing fluid over a wide range from low speed to high speed without narrowing the seal gap.
[0007]
The present invention has been made in view of this point, and an object thereof is to provide a sealing device capable of preventing leakage of a sealing fluid over a wide range from a low speed to a high speed without narrowing a seal gap. And
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the sealing device according to claim 1 of the present invention is characterized in that a sealing gap is provided between the rotating body and the stationary part, and leakage of the sealing fluid is caused by the rotation of the rotating body. In the sealing device that can prevent contactless contact, a floating ring that is movable in a radial direction and an axial direction is provided in the seal gap, and the floating ring can rotate the rotating body in the seal gap. Along with the contact with the sealing fluid that is about to flow out to the atmosphere through the seal gap, the rotating ring rotates at a speed slower than the rotating speed of the rotating body and is held coaxially with the rotating body. The gaps formed on the left and right sides of the floating ring are automatically adjusted to move in the axial direction so that the respective pressures of the sealing fluid existing in the gaps formed on the left and right sides are balanced. Is formed so as to be, the atmospheric side of the floating ring of the rotary body side is provided with a lip seal formed of a rubber-like elastic body, wherein the stationary portion side lip end of the lip seal A seal abutting surface that contacts and separates is provided, and the lip seal is elastically contacted by the elastic abutment force at least when the rotation of the rotating body is stopped so that the lip tip comes into contact with the seal abutting surface from In addition to preventing leakage of the sealing fluid, the lip end is moved away from the seal contact surface by elastic deformation due to centrifugal force as the rotating body rotates. By adopting such a configuration, it is possible to reliably and easily prevent leakage of the sealing fluid over a wide range from low speed to high speed without narrowing the seal gap due to the effect of the floating ring. Further, since the lip seal is disposed closer to the atmosphere than the floating ring on the rotating body side, the sealing fluid is reliably and easily leaked when the rotating body is stopped and at a low speed when the sealing function of the floating ring is not exhibited. Can be prevented.
[0009]
The feature of the sealing device of the present invention according to claim 2, in claim 1, comprising pre-Symbol rotary section to the rotating member, a fixing member on the stationary side, respectively, said rotary member inside the fixing member And the floating ring is housed, and a separation preventing wall for preventing the rotating member and the floating ring from being separated from the fixing member is formed integrally with the fixing member. It is in. By adopting such a configuration, the rotating member, the fixing member, and the floating ring are not separated, so that the handling property and the workability when the sealing device is attached to the rotating body and the stationary part can be improved. .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
[0011]
FIG. 1 is a cross-sectional view showing a main part of a first embodiment of a labyrinth seal as a sealing device according to the present invention.
[0012]
As shown in FIG. 1, a labyrinth seal 1 as a sealing device of the present embodiment is opposed to a rotating member 3 mounted on a rotating shaft 2 as a rotating body and a rotating member 3 on a housing 4 as a stationary part. And a floating ring 6. The left side of the labyrinth seal 1 in FIG. 1 is a sealing side OS in which lubricating oil as a sealing fluid exists, and the right side of the labyrinth seal 1 in FIG. 1 is an atmospheric side AS.
[0013]
The rotating member 3 is integrally formed by baking a rotating member elastic seal 8 formed of a rubber-like elastic body on an annular rotating member ring 7 formed of metal or resin.
[0014]
The rotating member ring 7 includes an inner cylindrical portion 9. The inner cylindrical portion 9 is formed to have a slightly larger diameter than the rotary shaft 2 and has a predetermined length that is shorter than the length of the rotary shaft 2 along the axial direction shown in the left-right direction in FIG. Has been. An inner upright wall portion 10 having a substantially annular side surface that is bent substantially perpendicularly outward in the radial direction toward the inner peripheral surface of the housing 4 extends to the left end edge located on the sealing side OS of the inner cylindrical portion 9. Is formed. The outer peripheral edge of the inner upright wall portion 10 is formed so as to be positioned at a substantially intermediate portion between the outer peripheral surface of the rotating shaft 2 and the inner peripheral surface of the housing 4. Further, an intermediate cylindrical portion 11 that is bent at a substantially right angle toward the atmosphere side AS is formed to extend along the axial direction on the outer peripheral edge of the inner upright wall portion 10. The length of the intermediate cylindrical portion 11 is shorter than the length of the inner cylindrical portion 9, and the right end edge of the intermediate cylindrical portion 11 is bent at a substantially right angle outward in the radial direction toward the inner peripheral surface of the housing 4. A side wall 12 for forming a rotation-side seal gap that is substantially annular is formed to extend. Further, an outer cylindrical portion 13 bent at a substantially right angle toward the sealing side OS is formed on the outer peripheral edge of the rotation-side seal gap forming wall portion 12 so as to extend in the axial direction.
[0015]
The rotary member elastic seal 8 includes a rotary shaft mounting portion 14 and a lip seal 15 as a seal member for preventing oil leakage from a seal gap 25 described later at least when the rotary shaft 2 stops rotating.
[0016]
One rotating shaft mounting portion 14 is disposed on the inner peripheral surface of the inner cylindrical portion 9 of the rotating member ring 7, and has an appropriate allowance for the rotating shaft 2.
[0017]
The other lip seal 15 has a base portion disposed on a side surface of the inner upright wall portion 10 of the rotating member ring 7 located on the atmosphere side AS, and a lip tip 16 is disposed on the atmosphere side AS. The lip seal 15 is formed so as to gradually increase in diameter from the side surface on the atmosphere side AS of the inner upright wall portion 10 toward the atmosphere side AS. Further, when the rotation of the rotary shaft 2 is stopped, the lip seal 15 is elastically brought into contact with a seal contact surface 21 (to be described later) of the fixing member 5 with an appropriate tightening margin, as shown by a broken line in FIG. When the rotary shaft 2 is rotated, the lip tip 16 is formed so as to be separated from the seal contact surface 21 by a centrifugal force accompanying the rotation of the rotary shaft 2 as shown by a solid line in FIG.
[0018]
That is, the lip tip 16 of the lip seal 15 is formed so as to be able to contact and separate from the seal contact surface 21.
[0019]
The lip seal 15 of this embodiment is configured such that the lip tip 16 abuts against the seal abutment surface 21 formed in a direction orthogonal to the axial direction from the axial direction. The contact surface 21 may be formed along the axial direction, and the lip tip 16 may be brought into contact with the seal contact surface 21 from the radially outer side.
[0020]
The fixing member 5 is integrally formed by baking a fixing member elastic seal 18 formed of a rubber-like elastic body on an annular fixing member ring 17 formed of metal or resin.
[0021]
The fixing member ring 17 has a horizontal cylindrical portion 19 whose outer peripheral surface is parallel to the axial direction facing the inner peripheral surface of the housing 4, and a diameter from a right edge located on the atmosphere side AS of the horizontal cylindrical portion 19. It is formed in a substantially L-shaped cross section having an inward flange-shaped fixed-side seal gap forming wall portion 20 bent at a substantially right angle toward the direction center. And the internal peripheral surface of the horizontal cylindrical part 19 is arrange | positioned so that it may oppose with a proper space | interval with the outer peripheral surface of the outer side cylindrical part 13 of the said rotary member ring 7 in an attachment state. Furthermore, the side surface of the sealing-side OS of the fixed-side seal gap forming wall portion 20 is disposed so as to face the air-side AS side surface of the rotation-side seal gap forming wall portion 12 with a predetermined interval. That is, the fixed-side seal gap forming wall portion 20 and the rotation-side seal gap forming wall portion 12 are arranged substantially in parallel. Further, the vicinity of the inner peripheral side of the side surface of the sealing-side OS of the fixed-side seal gap forming wall portion 20 is a seal contact surface 21 on which the lip tip 16 of the lip seal 15 contacts when the rotary shaft 2 is stopped. ing.
[0022]
The fixing member elastic seal 18 covers the outer periphery of the horizontal tubular portion 19 of the fixing member ring 17 and the side surface of the atmosphere side AS of the fixing side seal gap forming wall portion 20 of the fixing member ring 17. The portion that covers the outer periphery of the horizontal cylindrical portion 19 is a housing mounting portion 22 that has an appropriate tightening allowance with respect to the inner peripheral surface of the housing 4.
[0023]
A floating ring 6 made of resin, metal, or the like is disposed between the rotation-side seal gap forming wall 12 and the fixed-side seal gap forming wall 20. The floating ring 6 is disposed so as to be movable in the radial direction and the axial direction between the rotation-side seal gap forming wall portion 12 and the fixed-side seal gap forming wall portion 20.
[0024]
That is, the gap G between the rotation-side seal gap forming wall portion 12 and the fixed-side seal gap forming wall portion 20 is formed larger than the thickness T shown in the axial direction of the floating ring 6. The gap 23 between the opposing surfaces of the rotation-side seal gap forming wall 12 and the floating ring 6 and the gap 24 between the opposing surfaces of the fixed-side seal gap forming wall 20 and the floating ring 6 are both used. A seal gap 25 is formed.
[0025]
That is, the size of the gap 23 between the opposed surfaces of the rotation-side seal gap forming wall 12 and the floating ring 6 and the size of the gap 24 between the opposed surfaces of the fixed-side seal gap forming wall 20 and the floating ring 6. , In other words, a value obtained by subtracting the thickness T of the floating ring 6 from the gap G between the rotation-side seal gap forming wall portion 12 and the fixed-side seal gap forming wall portion 20. It is the size of the gap 25.
[0026]
In addition, it is preferable that the size of the inner and outer diameters of the floating ring 6 is a size that does not come into contact with the lip seal 15 in the rotation stop state in which the rotation shaft 2 is stopped and the rotation state in which the rotation shaft 2 is rotating.
[0027]
Next, the operation of the present embodiment having the above-described configuration will be described.
[0028]
According to the labyrinth seal 1 of the present embodiment, when the rotation of the rotating shaft 2 is stopped and at a low speed, the lip tip 16 of the lip seal 15 is elastically restored by its own elastic restoring force, as shown by the broken line in FIG. The oil contact from the sealing side OS to the atmosphere side AS can be reliably and easily prevented.
[0029]
When the rotating shaft 2 starts rotating, the lip tip 16 of the lip seal 15 is elastically deformed radially outward by the centrifugal force accompanying the rotation of the rotating shaft 2 as the rotation increases. Due to this elastic deformation, the lip tip 16 of the lip seal 15 is expanded, and the lip tip 16 of the lip seal 15 is separated from the seal contact surface 21 as indicated by the solid line in FIG. As a result, when the rotary shaft 2 rotates, the lip tip 16 of the lip seal 15 and the seal contact surface 21 can be held in a non-contact state. Note that the lip tip 16 of the lip seal 15 separated from the seal abutment surface 21 by the centrifugal force accompanying the rotation of the rotating shaft 2 is applied to the seal by its own elastic restoring force when the rotation of the rotating shaft 2 is slowed or stopped. The original state of contact with the contact surface 21 is easily restored.
[0030]
Therefore, according to the labyrinth seal 1 of this embodiment, it is possible to reliably and easily prevent oil leakage when the rotation of the rotary shaft 2 is slow or stopped.
[0031]
In addition, according to the labyrinth seal 1 of the present embodiment, as the rotation of the rotating shaft 2 starts, the oil present in the sealing side OS is accompanied by the rotation of the rotating member 3 attached to the rotating shaft 2 as the rotation increases. Due to the centrifugal force, the fluid flows so as to stick to the inner peripheral surface side of the fixing member 5, and a part of the fluid flows through the seal gap 25 from the sealing side OS to the atmosphere side AS. However, the oil that is about to flow out to the atmosphere side AS through the seal gap 25 is rotated and captured in a laminar flow state by the floating ring 6 disposed in the seal gap 25 and is prevented from flowing out to the atmosphere side AS. This prevents the oil from leaking to the atmosphere side AS.
[0032]
At this time, since the floating ring 6 is disposed so as to be movable in the seal gap 25, the floating ring 6 rotates at a speed slower than the rotation speed of the rotary shaft 2 by contact with oil, and a rotation-side seal gap is formed. The pressure of oil existing in the gap 23 between the facing surfaces of the wall 12 and the floating ring 6 and the oil existing in the gap 24 between the facing surfaces of the fixed-side seal gap forming wall 20 and the floating ring 6 It moves in the axial direction so that the pressure is balanced. That is, the floating ring 6 is held coaxially with the rotary shaft 2 and is automatically aligned so that the gaps 23 and 24 formed on the left and right sides of the floating ring 6 are held.
[0033]
According to the labyrinth seal 1 of the present embodiment, the floating ring 6 is disposed between the rotation-side seal gap forming wall 12 and the fixed-side seal gap forming wall 20. Without narrowing the size of the oil, it is possible to reliably and easily prevent the oil from leaking to the atmosphere side AS over a wide range from low speed to high speed.
[0034]
This could be confirmed by a performance evaluation test. In this performance evaluation test, as shown in FIG. 2 (a), a metal perpendicular to the axial direction by an annular body having a substantially L-shaped cross section instead of the rotating member 3 on the outer peripheral surface of a rotating shaft having an outer diameter of 80 mm. A transparent vertical wall 31 made of rotation is provided, and transparent on the inner peripheral surface of the housing 4 having an inner diameter of 100 mm can be observed from the atmosphere side AS perpendicular to the axial direction by an annular body having a substantially L-shaped cross section instead of the fixing member 5. The fixed side vertical wall 32 made of a resin is provided, the floating ring 6 is disposed between the rotary side vertical wall 31 and the fixed side vertical wall 32, and 0.5 mm (the rotary side vertical wall 31 and the fixed side vertical wall). A product provided with a seal gap 25 having a value obtained by subtracting the thickness T of the floating ring 6 from the gap G between the wall 32 and the wall 32 is a product of the present invention, and as shown in FIG. Without providing the floating ring 6 between 31 and the fixed vertical wall 32 Those provided Lumpur gap 25 is used as the conventional product. The size of the seal gap 25 of the conventional product is 4 mm of 0.1 mm (conventional product 1), 0.2 mm (conventional product 2), 0.3 mm (conventional product 3) and 0.4 mm (conventional product 4). The type was used.
[0035]
And about this invention product and a conventional product, the lubricating oil as a sealing fluid, ie, Castle SL 5W-20 (Toyota brand name) is used, the oil temperature of lubricating oil is 150 degreeC, and the rotation speed of the rotating shaft 2 is set. The amount of oil leakage when rotating in 7 stages of 750, 2000, 3000, 4500, 6000, 7000, and 9000 rpm was evaluated. The lubricating oil was supplied to the sealing side OS with the rotating shaft 2 being rotated. Further, the amount of oil leakage is obtained by measuring the amount of lubricating oil leaked to the atmosphere side AS after 30 minutes have passed since the lubricating oil was supplied to the sealing side OS.
[0036]
The evaluation results of this performance evaluation test are shown in FIG.
[0037]
As shown in FIG. 3, the product of the present invention was found to have good sealing performance with no oil leakage in the entire rotation region (750 to 9000 rpm) even when the seal gap 25 was 0.5 mm.
[0038]
In contrast, the conventional product was inferior to the product of the present invention in spite of the fact that the seal gap 25 was narrower than that of the product of the present invention. That is, all of the conventional products 1 to 4 have oil leaks and cannot prevent the oil leaks. More specifically, as shown in FIG. 3, the conventional products 1 and 2 have oil leakage when the rotational speed of the rotary shaft 2 exceeds 4500 rpm, even though the seal gap 25 is as small as 0.1 mm and 0.2 mm. Occurred. In addition, in the conventional products 3 and 4, although the seal gap 25 is 0.3 mm and 0.4 mm, which is narrower than that of the present invention, an oil leak occurs when the rotational speed of the rotary shaft 2 exceeds 2000 rpm. The amount was large. The oil leakage amount at 9000 rpm of the conventional product is 0.3 cc / min for the conventional product 1, 0.5 cc / min for the conventional product 2, 5.4 cc / min for the conventional product 3, and 8.4 cc / min for the conventional product 4. min.
[0039]
In the performance evaluation test, in a state where there is no oil leakage, the oil surface that is a boundary portion with the oil atmosphere is held in the seal gap 25 in an annular shape, and the oil surface may rotate in a laminar flow state. found. Further, it has been found that the oil leakage state occurs when the oil surface is disturbed so as to wave, and a part of the oil surface is peeled off and scattered on the atmosphere side AS.
[0040]
The labyrinth seal of the present invention has a good sealing performance even though the seal gap is wider than that of the conventional product. The floating ring arranged in the seal gap is slower than the rotation speed of the rotation shaft as the rotation shaft rotates. This is because by rotating at a speed, the oil level in the seal gap is held in an annular shape in a laminar flow state without being disturbed.
[0041]
In addition, when the labyrinth seal 1 of this embodiment was manufactured and the performance evaluation test by an actual product was conducted, it has confirmed that there was no oil leak and it had favorable sealing performance in the whole rotation area | region (0-9000 rpm).
[0042]
Therefore, according to the labyrinth seal 1 of the present embodiment, since the seal gap 25 can be set wider than in the past, the size of the seal gap 25 is not narrowed, and the sealing fluid can be applied over a wide range from low speed to high speed. Leakage can be reliably and easily prevented. As a result, tolerances in manufacturing the labyrinth seal 1 and mounting accuracy of the labyrinth seal 1 can be relaxed, and the axial play of the rotating shaft 2 can be absorbed. Can be easily achieved.
[0043]
FIG. 4 shows a second embodiment of the labyrinth seal according to the present invention. The labyrinth seal 41 according to the present embodiment is integrated so that the rotating member 3, the fixing member 5, and the floating ring 6 are not separated.
[0044]
That is, the labyrinth seal 41 of the present embodiment prevents the rotating member 3 and the floating ring 6 disposed inside the fixing member 5 from moving in the axial direction and being separated from the fixing member 5 during handling. By providing an inward flange-shaped separation preventing wall 42 bent at a substantially right angle toward the center in the radial direction at the left end edge of the horizontal tubular portion 19 of the fixing member ring 17 constituting the fixing member 5. It is configured. The separation preventing wall 42 is formed in a horizontal and thin shape in the axial direction so as to be necessary for forming the separation preventing wall 42 in advance after the floating ring 6 and the rotating member 3 are accommodated in the fixed member 5. It is formed by bending the left end portion of the cylindrical portion 19 toward the center in the radial direction. Other configurations are the same as those of the labyrinth seal 1 of the first embodiment described above, and a detailed description thereof is omitted.
[0045]
With such a configuration, the labyrinth seal 41 of the present embodiment can achieve the same effects as the labyrinth seal 1 of the first embodiment described above, and the rotating member 3, the fixing member 5, and the floating ring 6 are not separated. Therefore, it is possible to improve both handleability and workability when attaching the labyrinth seal 41 to the rotary shaft 2 and the housing 4.
[0046]
FIG. 5 shows a third embodiment of the labyrinth seal according to the present invention. The labyrinth seal 51 of this embodiment is provided with a fixed-side seal gap forming wall portion 20 in a part of the housing 4 as a stationary portion.
[0047]
That is, the labyrinth seal 51 of the present embodiment is provided with a fixed-side seal gap forming wall portion 20 in a part of the housing 4 itself. A cylindrical portion 52 that is bent substantially perpendicularly in the axial direction toward the side OS is formed to extend. The lip tip 16 of the lip seal 15 provided on the rotary member 3 is formed so as to come into contact with the outer peripheral surface of the cylindrical portion 52 from the outside in the radial direction when the rotation of the rotary shaft 2 is stopped and at a low speed. (See the broken line in the figure) The outer peripheral surface of the cylindrical portion 52 with which the lip tip 16 abuts is the seal abutment surface 21. In addition, it is good also as a structure which abuts the lip tip 16 of the lip seal 15 against the side surface located on the sealing side OS of the fixed side seal gap forming wall portion 20 without providing the cylindrical portion 52.
[0048]
Other configurations are the same as those of the labyrinth seal 1 of the first embodiment described above, and a detailed description thereof is omitted.
[0049]
With such a configuration, the labyrinth seal 51 of this embodiment can achieve the same effects as the labyrinth seal 1 of the first embodiment described above.
[0050]
The sealing device of the present invention can be used for preventing leakage of a sealing fluid made of a liquid or a mixture of a liquid and a solid in an engine or a pump shaft that requires low torque.
[0051]
The present invention is not limited to the above-described embodiments, and various modifications can be made as necessary.
[0052]
【The invention's effect】
As described above, according to the sealing device of the present invention according to claim 1, it is possible to reliably and easily prevent leakage of the sealing fluid over a wide range from low speed to high speed without narrowing the seal gap. It has an extremely excellent effect. According to the sealing device of the present invention according to claim 1, since the lip seal is disposed on the atmosphere side from the floating ring on the rotating body side, the rotation of the rotating body that does not perform the sealing function by the floating ring is stopped. There are excellent effects such as the ability to reliably and easily prevent leakage of the sealing fluid at the time and at low speed.
[0053]
Further, according to the sealing device of the present invention according to claim 2, rotating member, since the fixing member and the floating ring is not separated, handleability, and workability in mounting the rotating member and the stationary portion of the sealing device together It has extremely excellent effects such as being able to improve.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a main part of a first embodiment of a labyrinth seal as a sealing device according to the present invention. FIG. 2 is a cross-sectional view showing a configuration of a labyrinth seal used in a performance evaluation test. FIG. 3 is a diagram showing the relationship between the number of rotations of the rotating shaft and the amount of oil leakage. FIG. 4 is a second embodiment of a labyrinth seal as a sealing device of the present invention. The same figure as FIG. 1 which shows the principal part of FIG. 5 is a figure similar to FIG. 1 which shows the principal part of 3rd Embodiment of the labyrinth seal as a sealing device of this invention.
1, 41, 51 Labyrinth seal 2 Rotating shaft 3 Rotating member 4 Housing 5 Fixed member 6 Floating ring 12 Rotating side seal clearance forming wall 15 Lip seal 16 Lip tip 20 Fixed side sealing clearance forming wall 21 Seal contact surface 23, 24 Gap 25 Seal gap 42 Separation preventing wall 52 Cylindrical part G Distance T between rotation side seal gap forming wall part and fixed side seal gap forming wall part Thickness AS (floating ring) AS Air side OS Sealed side

Claims (2)

In a sealing device that provides a seal gap between the rotating body and the stationary part, and prevents leakage of sealing fluid in a non-contact manner by rotation of the rotating body,
A floating ring that is movable in the radial direction and the axial direction is provided in the seal gap, and the floating ring flows out to the atmosphere side through the seal gap as the rotating body rotates in the seal gap. Of the sealing fluid that rotates at a speed slower than the rotational speed of the rotating body and is held coaxially with the rotating body and that exists in the gap formed on the left and right of the floating ring. It is formed so that each pressure moves in an axial direction so as to maintain a balance and is automatically aligned so that a gap formed on the left and right of the floating ring is maintained.
A lip seal formed of a rubber-like elastic body is provided on the atmosphere side of the floating ring on the rotating body side , and a seal contact surface on which the lip tip of the lip seal contacts and separates is provided on the stationary part side. The lip seal prevents the leakage of the sealing fluid from the seal gap by elastically contacting the seal contact surface by the elastic restoring force of the lip body at least when the rotating body is stopped. A sealing device, wherein the lip tip moves away from the seal contact surface by elastically deforming by receiving centrifugal force as the rotating body rotates.   The rotating member side has a rotating member, the stationary part side has a fixing member, and the rotating member and the floating ring are accommodated inside the fixing member. The sealing device according to claim 1, wherein a separation preventing wall for preventing the floating ring from separating from the fixing member is formed integrally with the fixing member.

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