JP2002295690A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device which can be easily manufactured, and which is superior in durability and assembling easiness. SOLUTION: An O-ring 5 for achieving sealing performance between a housing 20 and a first ring 3 engaged with each other with play is made detachable, and an integration process for a rubber elastic body can be eliminated to facilitate manufacturing. Since the O-ring 5 can be replaced, even if it is spent, the sealing device 1 itself is usable up to the durability limit of a sealing lip 10. Since the housing 20 and the first ring 3 are engaged with each other with plays, deformation of the first ring 3 due to thermal expansion can be allowed, and breakage of the sealing device 1 due to stress concentration at the first ring 3 can be restricted, to improve durability. In this engagement state with plays, engagement load will not increase, and even when the sealing device 1 is totally assembled by manual work in a continuous casting machine or the like, ease of on-site assembling of the sealing device 1 is satisfactory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device used for sealing, for example, a steel caster.

[0002]

2. Description of the Related Art As a conventional sealing device, for example, an oil sealing type sealing device for sealing around a roller shaft of a housing, which is used in a steel caster or the like, is known as shown in FIG.

That is, the sealing device 101 shown in FIG.
A first ring 103 in which a seal lip 110 and an outer seal portion 105 made of a rubber-like elastic body are integrally baked is fitted to a housing 120, and the inner periphery of the first ring 103 is sealed by a fourth ring 108. Second and third rings 106 and 107 positioned and fixed at a predetermined distance from lip 110
Thus, an annular space was formed, and a combination seal 111 in which a resin sliding ring 112 and a rubber-like elastic body back ring 113 were combined was disposed in the annular space.

In recent years, in order to further improve the durability of the seal lip sliding on the shaft 121, as shown in FIG.
1 'was also considered. This sealing device 101 ′ includes a first and a fifth ring 103, 10
9, the fifth ring 109 and the third ring 107 are separated by a predetermined distance by a fourth ring 108.

[0005]

However, in the sealing device 101 'shown in FIG. 5 of the prior art, although the seal lip 110' is made of resin, the outer peripheral seal portion 105 is formed.
Are still made of a rubber-like elastic body that is integrated by baking with the first ring 103, and an integration step of vulcanization and baking (or bonding, etc.) of the rubber-like elastic body is necessary only for forming the outer peripheral seal portion 105. Therefore, reduction of such steps has been desired from the viewpoint of manufacturing simplicity.

In a continuous casting machine or the like, the sealing device cannot be automatically assembled, and all the operations are performed manually. Therefore, the rubber-like elastic body using the outer peripheral seal portion 105 is simply stopped, and If the metal fitting of only one ring 103 is used, the fitting load of the metal fitting becomes high, and the problem that the incorporation of the sealing device on site is extremely deteriorated also occurs.

[0007] The present invention is to solve the above-mentioned problems of the prior art.
Another object of the present invention is to provide a sealing device excellent in durability and incorporation.

[0008]

In order to achieve the above object, according to the present invention, there is provided a seal portion slidably sealingly contacting a mating member having a gap formed between the seal member and the seal member. A fitting portion that holds and is fixed to the mounting member, wherein the fitting portion holds the seal portion and a metal holding member that is loosely fitted to the mounting member; A removable rubber-like elastic sealing member for sealing between the metal holding member and the mounting member.

Therefore, the sealing member made of rubber-like elastic material which exerts the sealing property of the fitting portion is detachable, so that the process of vulcanizing and baking (or bonding, etc.) the rubber-like elastic material at the fitting portion is integrated. Can be reduced and manufacturing is easy. Further, since only the rubber-like elastic sealing member can be replaced, the sealing device itself can be used up to the durability limit of the sealing portion.

Further, since the metal holding member of the fitting portion is in a loosely fitted state, deformation due to thermal expansion of the metal holding member is allowed, generation of internal stress can be reduced, and breakage due to stress concentration is suppressed and durability is improved. Performance can be improved. In addition, in the loosely fitted state, the fitting load does not increase, and even when all the sealing devices are manually installed in a continuous casting machine or the like, the incorporation of the sealing device on site becomes good.

It is preferable not to integrate a rubber-like elastic body into either the seal portion or the fitting portion.

This eliminates the need for an integral step of vulcanizing and baking (or bonding, etc.) the rubber-like elastic body during the production of the sealing device, which facilitates production.

[0013] It is preferable that the seal portion is formed of a resin seal member.

Thus, the durability limit of the seal portion can be dramatically improved, and the durability of the sealing device itself can be improved to the durability limit of the seal portion by replacing the rubber-like elastic sealing member.

It is preferable that a mounting groove in which the rubber-like elastic sealing member is mounted is formed on a surface of the metal holding member facing the mounting member.

Thus, the rubber-like elastic sealing member can be mounted in the mounting groove of the metal holding member, and the space between the metal holding member and the mounting member can be sealed.

It is preferable that a mounting groove in which the rubber-like elastic sealing member is mounted is formed on a surface of the mounting member facing the metal holding member.

Thus, the rubber-like elastic sealing member can be mounted in the mounting groove of the mounting member, and the space between the metal holding member and the mounting member can be sealed.

A mounting groove in which the rubber-like elastic sealing member is mounted is formed on a surface of the metal holding member facing the mounting member, and the seal portion is provided in the mounting groove of the metal holding member. It is preferable that the base member be formed at the projecting position protruding toward the counterpart member and extend from the protruding position to the counterpart member.

Thus, the base portion of the seal portion is moved toward the mating member to the projecting position of the metal holding member, thereby shortening the length of the seal portion and reducing the amount of expensive material (resin material, etc.) used for the seal portion. As a result, the cost can be reduced without deteriorating the functions, and customer requirements can be optimized.

[0021]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the dimensions of the components described in this embodiment,
The material, shape, relative arrangement, and the like are not intended to limit the scope of the present invention only to them unless otherwise specified.

(First Embodiment) FIG. 1 is a half sectional view showing a sealing device 1 according to a first embodiment. The sealing device 1 shown in FIG. 1 is used for, for example, a steel continuous casting machine or the like, and is an oil seal type that seals around a shaft 21 (a mating member) of a housing 20 (mounting member).

The sealing device 1 shown in FIG. 1 comprises a device main body 2 and a combination seal 11. The device body 2
The first ring 3 is fitted to the housing 20 and the first ring
A resin-made seal lip 10 is fixedly held between the first and fifth rings 3 and 9 at the sealing-side I end of the ring 3, and a predetermined distance is provided between the fifth ring 9 and the third ring 7 by the fourth ring 8. An annular space is formed by the second and third rings 6 and 7 positioned and fixed at a predetermined distance from the seal lip 10 by the fourth ring 8.
The combination seal 11 is disposed in the annular space of the apparatus main body 2 and is a combination of a resin sliding ring 12 and a rubber-like elastic back ring 13.

First, the device body 2 of the sealing device 1 will be described. The first ring 3 is made of metal and has first and second cylindrical portions 3a and 3b loosely fitted to a housing 20 as a mounting member.
, An annular groove 4, and a flange portion 3c formed inward at an end on the sealing side I of the second cylindrical portion 3b. The first cylindrical portion 3a has a caulked portion 3d at the O-end on the non-sealing side. Between the first and second cylindrical portions 3a, 3b, groove side wall portions 3e,
An annular groove 4 is formed by 3f and the groove bottom 3g. An O-ring 5 as a sealing member made of a rubber-like elastic body is mounted in the annular groove 4.

The O-ring 5 has an annular shape made of a rubber-like elastic material (the material of the rubber-like elastic material is NBR (nitrile rubber), urethane rubber or the like) which is detachable from the annular groove 4.
When the first ring 3 is mounted in the annular groove 4, the space between the first ring 3 and the housing 20 is crushed to seal the space. That is, the O-ring 5 and the first
The ring 3 is a so-called fitting portion for fixing the sealing device 1 to the housing 20.

In addition to the O-ring 5, as a rubber-like elastic sealing member, for example, a D-ring, a square ring, etc.
The sectional shape is not particularly limited as long as it exhibits a sealing property.

The second ring 6 is made of metal, and is formed inward at a cylindrical portion 6a abutting on the inner periphery of the first cylindrical portion 3a of the first ring 3 and at an O-end portion on the non-sealing side of the cylindrical portion 6a. Flanged portion 6b,
It has. The cylindrical portion 6a of the second ring 6 and the flange portion 6
The outside of the bent portion b is caulked and fixed by the caulked portion 3 d of the first ring 3.

The third ring 7 is made of metal, and has a cylindrical portion 7a in contact with the inner periphery of the cylindrical portion 6a of the second ring 6, and a flange formed inward at an end on the sealing side I of the cylindrical portion 7a. A portion 7b. The cylindrical portion 7a of the third ring 7 abuts against the flange portion 6b of the second ring 6, and is surrounded by the flange portion 6b of the second ring 6, the cylindrical portion 7a of the third ring 7, and the flange portion 7b. Are formed to form an annular space.

The fourth ring 8 is made of metal, and is formed inward at a cylindrical portion 8a which is in contact with the inner periphery of the groove bottom 3g of the first ring 3 and at the O-end on the non-sealing side of the cylindrical portion 8a. A flange portion 8b. The cylindrical portion 8a of the fourth ring 8 is abutted against the fifth ring 9, and the flange portion 8b of the fourth ring 8 is
The fourth ring 8 separates the fifth ring 9 from the flange 7b of the third ring 7 by a predetermined distance.

The fifth ring 9 has a metal washer shape and has a seal lip 1 between the first ring 3 and the flange portion 3c.
0, and the cylinder portion 8a of the fourth ring 8 abuts against the fifth ring 9 to obtain a clamping force for clamping the seal lip 10.

The seal lip 10 is made of resin (a resin having high slidability and abrasion durability such as Teflon (registered trademark) (polytetrafluoroethylene) or nylon is used as the resin). To the second cylindrical portion 3b of the first ring 3.
And the inside of the bent portion of the flange portion 3c.
The inner diameter side of the holding area sandwiched between the flange portion 3c and the fifth ring 9 is bent toward the non-sealing side O to slidably and sealingly contact the shaft 21 as a mating member. That is, the seal portion is a seal portion in which the seal lip 10 is held by the fitting portion and slidably and sealingly contacts the shaft 21.

The first to fifth rings 3, 6, 7, 8, and 9 necessary for holding the seal lip 10 are metal holding members. Note that the metal holding member only needs to be able to serve as a fitting portion and hold the seal portion. For example, a configuration in which the seal lip 10 is fixed by caulking with only the first ring 3 may be used, and is not limited to the above configuration.

The first to fifth rings 3, 6, 7, 8, 9 and the seal lip 10 are provided inside the first ring 3 with the seal lip 10, the fifth ring 9, the fourth ring 8, The second,
The third rings 6 and 7 are sequentially pushed in from the anti-sealing side O, and finally the end of the first ring 3 on the non-sealing side O is crimped and fixed to the crimping portion 3d.
The O-ring 5 is integrated by forming
The device main body 2 is formed by being mounted in the annular groove 4 of the ring 3.

On the other hand, the combination seal 11 disposed in the annular space formed by the second and third rings 6 and 7 constituting the apparatus main body 2 comprises a sliding ring 12 made of resin and a back ring 13 made of rubber-like elastic material. Are provided in combination.

The resin-made sliding ring 12 is made of Teflon (polytetrafluoroethylene), nylon, or the like, which has excellent slidability, and is formed into a ring having a rectangular cross section that is long in the axial direction. The resin sliding ring 12 has an inner peripheral surface that slides on the shaft 21 and an outer peripheral surface that contacts the buckling ring 13. Gaps are provided between both side surfaces of the resin sliding ring 12 and the flange portions 6b, 7b of the second and third rings 6, 7 to prevent wear.

The rubber-like elastic buckling 13 is formed in an annular shape having a substantially square cross section. This buckling 1
Numeral 3 makes the outer peripheral surface abut against the cylindrical portion 7a of the third ring 7 and makes the inner peripheral surface abut against the resin sliding ring 12, thereby applying a tightening force to the resin sliding ring 12. Gaps are provided between both side surfaces of the resin sliding ring 12 and the flange portions 6b, 7b of the second and third rings 6, 7 for convenience of filling rate.

In the sealing device 1 having the above-described structure, the first and second cylindrical portions 3a and 3b of the first ring 3 of the device main body 2 are loosely fitted in the housing 20 and mounted in the annular groove 4 of the first ring 3. An O-ring 5 seals between the housing 20 and the first ring 3. The seal lip 10 and the resin sliding ring 12 slide on the shaft 21.

Therefore, the O-ring 5 for exhibiting the sealing property between the housing 20 in the loosely fitted state and the first ring 3 is detachable, and the sealing device 1 of the present embodiment which does not integrate the rubber-like elastic body. In this case, the step of integrating vulcanization and baking (or bonding, etc.) of the rubber-like elastic body can be eliminated, and the production is easy. Further, since the O-ring 5 can be replaced even if it is damaged, the sealing device 1 itself can be replaced with the O-ring 5 up to the durability limit of the resin-made sealing lip 10 for improving the durability.
Can be used while replacing.

Further, the space between the housing 20 and the first and second cylindrical portions 3a and 3b of the first ring 3 is in a loosely fitted state,
The deformation caused by the thermal expansion of the ring 3 is allowed in the loosely fitted gap.
The generation of internal stress due to the restriction of the thermal expansion of the ring 3 can be reduced, the breakage of the sealing device 1 due to stress concentration can be suppressed, and the durability of the sealing device 1 can be improved. In addition, the fitting load does not increase in the loosely fitted state, and even when the sealing device 1 is entirely manually incorporated in a continuous casting machine or the like, the incorporation of the sealing device 1 at the site becomes good. .

(Second Embodiment) FIG. 2 shows a second embodiment. Sealing device 1 'of the present embodiment
Is to connect the outer diameter base of the seal lip 10 with the annular groove 4 of the first ring 3.
Are positioned by abutting against the groove bottom 3g, and the outer diameter base of the seal lip 10 is moved toward the shaft 21 to shorten the length of the seal lip 10.

Other configurations and operations are described in the first section.
Therefore, the same reference numerals are given to the same components, and the description will be omitted.

The sealing device 1 ′ of the present embodiment has a first ring 3
Has a configuration in which the annular groove 4 is formed at the end on the sealing side I, so there is no second cylindrical portion and one of the groove side walls, and the flange 3
c is bent and connected from the groove bottom 3g protruding toward the shaft 21 side.

The seal lip 10 has its outer diameter base positioned inside the groove bottom 3g of the first ring 3 projecting toward the shaft 21 and inside the bent portion of the flange 3c. It is sandwiched between the sixth ring 14. That is, the first
The outer diameter base of the seal lip 10 is moved toward the shaft 21 to the position where the groove bottom 3g of the ring 3 projects.

For this reason, the seal lip 1 of the present embodiment
0 is a diameter φD2 shorter than the diameter φD1 (shown in FIG. 1) of the seal lip 10 of the first embodiment, as shown in FIG.
Can be provided. Therefore, the amount of expensive resin material (Teflon (polytetrafluoroethylene), nylon, or the like) used for the seal lip 10 can be reduced, so that the cost can be reduced without lowering the function of the seal lip 10 sliding on the shaft 21. Optimize customer requirements.

The sixth ring 14 is made of metal, has a substantially square ring shape, and has the functions of the fourth and fifth rings used in the first embodiment, that is, the seal lip 10. The first
The role of sandwiching between the flange portion 3c of the ring 3 and the role of separating the flange portion 7b of the third ring 7 from the predetermined distance. By using the sixth ring 14, the amount of contact of the first ring 3 with the groove bottom 3g is reduced to prevent the support from becoming unstable, thereby maintaining a stable state and improving durability.

If the role of holding the seal lip 10 and the role of separating the third ring 7 by a predetermined distance are provided, the sixth ring 14 may be a U-shaped ring or the like. , The configuration of the fourth and fifth rings 8, 9 used in the first embodiment may be used.

(Third Embodiment) FIG. 3 shows a third embodiment. Sealing device 1 ″ of the present embodiment
Is formed with an annular groove 4 for mounting an O-ring 5 on the inner periphery of the housing 20.

Regarding other configurations and operations, the first
Therefore, the same reference numerals are given to the same components, and the description will be omitted.

The sealing device 1 ″ of the present embodiment includes a first ring 3
An annular groove 4 for mounting the O-ring 5 is formed on the inner periphery of the housing 20 into which the housing 20 is loosely fitted. The O-ring 5 is detachable from the annular groove 4.

Further, since the annular groove 4 is formed in the housing 20, the first ring 3 is composed of the first cylindrical portion 3a and the flange portion 3c. Then, the outer diameter base of the seal lip 10 is positioned inside the bent portion of the first cylindrical portion 3a and the flange portion 3c.

The fourth ring 8 is, in the first embodiment, a cylindrical portion 8.
By contacting a with the groove bottom of the first ring, it was possible to abut the approximate center of the diameter of the fifth ring 9, but in this embodiment, the cylindrical portion 8 a is connected to the first cylinder of the first ring 3. If it only makes contact with the portion 3a, it will only come into contact with the outer diameter end of the fifth ring 9 and the fifth ring 9 cannot be stabilized. Also, an inward second flange portion 8c is formed so as to be stable.

In the above-described embodiment, the case where a bearing is provided on the sealing side I in a continuous casting machine or the like to prevent water from entering from the non-sealing side O is described. Can also be used as a two-stage seal.

[0053]

As described above, according to the present invention, the fitting portion holds the sealing portion and loosely fits with the mounting member, and seals between the metal holding member and the mounting member. The rubber-like elastic sealing member that exhibits the sealing performance of the fitting portion is detachable, so that the rubber-like elastic member at the fitting portion is provided. The process of integration of vulcanization and baking (or bonding, etc.) can be reduced and manufacturing is easy. Also, since only the rubber-like elastic seal member can be replaced,
The sealing device itself can be used up to the durability limit of the sealing part.

Further, since the metal holding member of the fitting portion is in a loosely fitted state, deformation due to thermal expansion of the metal holding member is allowed, generation of internal stress can be reduced, and breakage due to stress concentration can be suppressed to reduce durability. Performance can be improved. In addition, in the loose fitting state, the fitting load does not increase, and even when all of the sealing devices are manually installed in a continuous casting machine or the like, the incorporation of the sealing device on site becomes favorable.

Since the rubber-like elastic body is not integrated into either the seal part or the fitting part, there is no step of integrating the vulcanization and baking (or bonding, etc.) of the rubber-like elastic body at the time of manufacturing the sealing device. Easy.

Since the sealing portion is made of a resin sealing member, the durability limit of the sealing portion can be drastically improved. By replacing the rubber-like elastic sealing member, the sealing portion can be sealed up to the durability limit of the sealing portion. The durability of the device itself can be improved.

On the surface of the metal holding member facing the mounting member,
By forming the mounting groove for mounting the rubber-like elastic seal member, the rubber-like elastic seal member is mounted in the mounting groove of the metal holding member, and the space between the metal holding member and the mounting member is sealed. can do.

On the surface of the mounting member facing the metal holding member,
By forming the mounting groove in which the rubber-like elastic sealing member is mounted, the rubber-like elastic sealing member is mounted in the mounting groove of the mounting member, and the space between the metal holding member and the mounting member is sealed. Can be.

On the surface of the metal holding member facing the mounting member,
A mounting groove in which the rubber-like elastic seal member is mounted is formed, and the seal portion extends from the protruding position to the mating member with the mounting groove of the metal holding member formed and protruding toward the mating member side as a base. By this, the base position of the seal portion is moved toward the mating member side to the projecting position of the metal holding member, the length of the seal portion is shortened, and the amount of expensive material (such as resin material) used for the seal portion can be reduced. Costs can be reduced without lowering functions, and customer requirements can be optimized.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a sealing device according to a first embodiment.

FIG. 2 is a half sectional view showing a sealing device according to a second embodiment.

FIG. 3 is a half sectional view showing a sealing device according to a third embodiment.

FIG. 4 is a half sectional view showing a conventional sealing device.

FIG. 5 is a half sectional view showing a conventional sealing device.

[Explanation of symbols]

 1, 1 ', 1 "Sealing device 2 Device body 3 First ring 4 Annular groove 5 O-ring 6 Second ring 7 Third ring 8 Fourth ring 9 Fifth ring 10 Seal lip 11 Combination seal 12 Resin sliding ring Reference Signs List 13 buckling made of rubber-like elastic material 14 sixth ring 20 housing 21 shaft

Claims (6)

[Claims] A sealing portion slidably and sealingly contacting a mating member having a gap formed between the mounting member and a fitting portion fixed to the mounting member while holding the sealing portion. In the sealing device, the fitting portion is a metal holding member that holds the seal portion and is loosely fitted to the mounting member, and a detachable seal that seals between the metal holding member and the mounting member. A sealing device comprising: a rubber-like elastic sealing member. 2. The sealing device according to claim 1, wherein a rubber-like elastic body is not integrated into either the seal portion or the fitting portion. 3. The sealing device according to claim 1, wherein the sealing portion is formed of a resin sealing member. 4. A mounting groove in which the rubber-like elastic seal member is mounted on a surface of the metal holding member facing the mounting member. The sealing device as described. 5. The mounting member according to claim 1, wherein a mounting groove in which the rubber-like elastic sealing member is mounted is formed on a surface of the mounting member facing the metal holding member. The sealing device as described. 6. A mounting groove in which the rubber-like elastic sealing member is mounted is formed on a surface of the metal holding member facing the mounting member, and the seal portion is provided on the metal holding member. 4. The sealing device according to claim 1, wherein the mounting groove is formed and extends from the protruding position to the mating member with the protruding position protruding toward the mating member as a base. 5.