JP2006207707A - Sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device 1 with a resin ring 10 and a rubber ring 11 fitted to the outer periphery side thereof for stabilizing seal bearing pressure by suppressing the fall-off of the rubber ring 11 from the resin ring 10 without using a means such as adhesive for integrating both rings 10, 11. <P>SOLUTION: In an annular seal storage space 9 formed by metal rings 7, 8 fixed to the side of a housing 21, a resin ring 10 is arranged to be slidably put in close contact with the peripheral face of a shaft 22 and the rubber ring 11 is arranged to be fitted to the outer periphery side of the resin ring 10 for backing up the resin ring 10. The resin ring 10 has a weir shaped engaging portion 15 for preventing the fall-off of the rubber ring 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sealing device according to a sealing technique. The sealing device of the present invention is used, for example, as a seal for a continuous casting machine in a continuous casting machine facility in the steel field or the iron making field.

  A continuous casting machine (continuous casting machine) is a device that cools molten steel made in a converter or electric furnace with a mold and continuously draws the solidified steel from the bottom of the mold like a strip to make a steel piece. Yes, it has a large number of rolls (also called shafts) in the transport path for transporting steel or steel slabs, and has a bearing that supports the shaft so that it can rotate freely, so that dust such as water and scale does not enter the bearing. In addition, a continuous caster seal is provided so that the bearing grease does not leak to the outside.

  However, as shown in FIG. 4, in the conventional continuous caster seal 51, the scale seal 52 is an annular seal formed by a plurality of metal rings 53 fixed to the housing (not shown) side. A resin ring 56 that is slidably in close contact with the peripheral surface of the shaft 55 and a rubber ring 57 that is fitted to the outer peripheral side of the resin ring 56 to back up the resin ring 56 are disposed in the accommodation space 54. Therefore, there is the following inconvenience (see Patent Document 1).

  That is, conventionally, the resin ring 56 and the rubber ring 57 are merely fitted to each other, and are not particularly integrated by means such as adhesion. For this reason, if the shaft 55 undergoes a thrust motion or a high pressure is applied from one axial direction during grease supply, the rings 56 and 57 may be displaced in the axial direction, and the worst depending on the size of the accommodation space 54. In this case, the rubber ring 57 may fall off from the resin ring 56, and the seal surface pressure that should be originally exhibited may be lost, and the sealing function may be impaired.

  In order to solve the above problem, it is conceivable to vulcanize and bond the rubber ring 57 to the outer peripheral surface of the resin ring 56. However, this measure cannot be adopted because the manufacturing cost increases.

JP 2002-147616 A (FIG. 2)

  In view of the above points, the present invention provides a sealing device in which a rubber ring is fitted to the outer peripheral side of a resin ring, and the rubber ring falls off the resin ring without integrating both rings by means such as adhesion. An object of the present invention is to provide a sealing device that can suppress the pressure and stabilize the sealing surface pressure. In addition to this, even if the resin ring is provided with a weir-like engagement portion for preventing the rubber ring from falling off, the movement of the resin ring in the radial direction is not hindered. It is an object to provide a sealing device that can be maintained.

  In order to achieve the above object, a sealing device according to claim 1 of the present invention is a resin ring that is slidably brought into close contact with a peripheral surface of a shaft in an annular seal housing space formed by a metal ring fixed to a housing side. And a rubber ring that is fitted to the outer peripheral side of the resin ring and backs up the resin ring, and has a weir-like engagement with the resin ring to prevent the rubber ring from falling off It is characterized in that a joint is provided.

  According to a second aspect of the present invention, there is provided the sealing device according to the first aspect, wherein a predetermined axial gap is set between the weir-like engaging portion and the metal ring. It is characterized by this.

  In the sealing device according to claim 1 of the present invention having the above configuration, the rubber ring is engaged with the weir-like engaging portion provided in the resin ring, whereby axial displacement of both the rings is suppressed, It is possible to suppress the rubber ring from falling off the resin ring. Further, when a predetermined axial gap is set between the weir-shaped engaging portion and the metal ring as in claim 2, the radial movement of the resin ring due to the eccentricity of the shaft or the like is brought into contact with the metal ring. It is not disturbed by resistance.

  The present invention has the following effects.

  That is, in the sealing device according to the first aspect of the present invention, since the resin ring is provided with the weir-like engagement portion for preventing the rubber ring from falling off, By engaging the rubber ring, it is possible to suppress the rubber ring from falling off from the outer periphery of the resin ring. Therefore, it is possible to prevent the sealing function from being impaired due to the seal surface pressure becoming unstable due to the falling off of the rubber ring.

  Further, when the weir-like engagement portion provided in the resin ring is in a structure that always contacts the metal ring, the resin ring comes into contact with the metal ring when it tries to move in the radial direction due to the eccentricity of the shaft. Although there is a concern that the movement is hindered by the resistance, in the sealing device according to claim 2, the axial gap of a predetermined size is set between the weir-like engagement portion and the metal ring. Thus, it is possible to prevent such a problem from occurring due to the provision of the engaging portion.

  The present invention includes the following embodiments.

Constitution···
In order to achieve the above object, rubber ring dropout prevention weirs are provided at both ends of the resin ring upper surface (outer peripheral surface). The weir is manufactured by integral processing of the resin ring.
effect···
According to the above configuration, since the rubber ring is separate from the resin ring, it does not fall off from the upper surface of the resin ring, so that a stable surface pressure can always be maintained. Since the weir is manufactured by integral processing of the resin ring, the cost can be reduced.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a half cut section of a continuous casting machine seal 1 as a sealing device according to an embodiment of the present invention. This continuous casting machine seal 1 is a water / scale seal on a roll bearing portion in a continuous casting machine. (Dust seal). The right side of the figure is the water / scale side (dust side, atmosphere side) A, and the left side of the figure is the grease side (bearing side) B.

  The continuous casting machine seal 1 according to the embodiment first includes a rubber outer seal 3 that seals between the seal 1 and a housing 21 to which the seal 1 is mounted, and a rubber that mainly functions as a water seal. A baked ring (also referred to as a first metal ring) 2 on which a lip seal (also referred to as a seal lip) 4 is fixed by baking is provided, and a flange portion 2e of the rubber baked ring 2 and a caulking tip portion 2f A scale seal housing ring 6 comprising a combination of a spacer ring (also referred to as a second metal ring) 5 and two metal rings (also referred to as third and fourth metal rings) 7 and 8 is caulked and fixed therebetween. A resin ring (seal) mainly acting as a scale seal is slidably in close contact with the peripheral surface of the shaft 22 in the scale seal housing space 9 formed inside the scale seal housing ring 6. The ring also referred to) 10, this is fitted to the outer peripheral side of the resin ring 10 is also referred to as a rubber ring (backup ring backing up the resin ring 10) 11 are disposed.

  The rubber-baking ring 2 has a cylindrical portion 2a that is fitted to the inner peripheral side of the housing 21. The cylindrical portion 2a is provided with a stepped portion 2b, and the grease side is a small diameter portion 2c. In addition, the water / scale side is the large diameter portion 2d. The rubber-baked ring 2 is formed by integrally molding a flange portion 2e radially inward at the grease side end portion and an annular caulking tip portion 2f at the water / scale side end portion. The outer peripheral seal portion 3 is baked and fixed to the outer peripheral surface of the small diameter portion 2c in the cylindrical portion 2a, and the lip seal 4 is baked and fixed to the inner peripheral edge portion of the flange portion 2e. The lip seal 4 is integrally formed through a rubber connecting portion 12 that is baked and fixed to the grease side end face of the flange portion 2f.

  The lip seal 4 mainly acting as a water seal is provided to seal water when there is water passing through the resin ring 10 mainly acting as a scale seal. It is provided from the inner peripheral edge of the portion 2f toward the water / scale side. A garter spring 13 is fitted on the outer periphery of the lip seal 4 as a tightening allowance adjusting spring for adjusting the tightening allowance of the lip seal 4 with respect to the shaft 22.

  The spacer ring 5 has a cylindrical portion 5a disposed on the inner peripheral side of the small diameter portion 2c in the cylindrical portion 2a of the rubber baking ring 2, and a flange is formed at the water / scale side end portion of the cylindrical portion 5a. The portion 5b is integrally formed inward in the radial direction. The spacer ring 5 forms a water seal accommodating space 14 for accommodating the lip seal 4 together with the flange portion 2 f of the rubber baking ring 2.

  A water / scale-side metal ring (third metal ring) 7 constituting one component of the scale seal housing ring 6 is disposed on the inner peripheral side of the large-diameter portion 2d in the cylindrical portion 2a of the rubber baking ring 2. A cylindrical portion 7a is provided, and a flange portion 7b is integrally formed radially inward at the water / scale side end portion of the cylindrical portion 7a.

  Further, a grease-side metal ring (fourth metal ring) 8 constituting the other constituent element of the scale seal housing ring 6 is a cylindrical part disposed on the inner peripheral side of the cylindrical part 7 a of the one metal ring 7. 8a, and a flange portion 8b is integrally formed radially inward at the grease side end of the cylindrical portion 8a. The other metal ring 8 forms a scale seal housing space 9 together with the flange portion 7 b of the one metal ring 7.

  The rubber ring 11 accommodated in the scale seal accommodating space 9 is fitted to the inner peripheral side of the cylindrical portion 8 a of the metal ring 8, and the resin ring 10 is fitted to the inner peripheral side of the rubber ring 11. ing. Therefore, the resin ring 10 is fixed to the metal ring 8 via the rubber ring 11, and thus the inner peripheral surface thereof is slidably in close contact with the peripheral surface of the shaft 22 without rotating during operation.

  The resin ring 10 and the rubber ring 11 are merely fitted to each other, and are not particularly integrated by means such as adhesion. For this reason, if the shaft 22 undergoes a thrust motion or a high pressure of grease is applied from one axial direction (left side in the figure) during grease supply, both the rings 10 and 11 are axially displaced from each other and the rubber ring 11 becomes a resin ring. As described above, there is a possibility of falling off from the outer periphery of the seal 10, and in order to prevent this, the seal 1 has the following measures.

That is, using the fact that the axial width w ₁ of the resin ring 10 having a rectangular cross section is slightly longer than the axial width w ₂ of the rubber ring 11 also having a rectangular cross section, the outer peripheral surface of the resin ring 10 is A dam-like engagement portion (simply referred to as “weir”) 15 is provided to prevent the rubber ring 11 from falling off. The rubber ring 11 is axially engaged with the dam-like engagement portion 15. By combining, the axial displacement of both the rings 10 and 11 is suppressed, and the rubber ring 11 is suppressed from dropping off from the outer peripheral surface of the resin ring 10.

  As shown in FIG. 2, the dam-like engagement portion 15 is formed in an annular shape, and the engagement portions 15 are integrally formed at both axial ends of the outer peripheral surface of the resin ring 10. Therefore, the intermediate part forms a relative groove part 16 with respect to the pair of engaging parts 15, 15 at both ends, and the rubber ring 11 is fitted into the groove part 16.

In addition, although various aspects can be considered about the cross-sectional shape of the resin ring 10 and the rubber ring 11, like the said Example,
(1) A rubber ring 11 having a rectangular cross section is fitted to the outer peripheral surface of the resin ring 10 having a rectangular cross section.
(2) dam-like engaging portions 15 are integrally formed at both axial end portions of the outer peripheral surface of the resin ring 10, respectively.
(3) The rubber ring 11 is fitted into the groove 16 formed in the middle between the pair of engaging portions 15 and 15 at both ends.
This is a preferable mode since the surface pressure of the resin ring 10 with respect to the shaft 22 is substantially uniform in the axial direction, thereby stabilizing the surface pressure (as shown in FIG. 3A). According to the example, the surface pressure distribution with respect to the shaft 22 of the resin ring 10 is uniform, whereas in the comparative example shown in FIG. Distribution is not uniform).

Returning to the description of FIG. 1, between the resin ring 10 and the metal rings 7 and 8 (between the resin ring 10 and the flange portion 7 b of the third metal ring 7 and between the resin ring 10 and the fourth metal ring 8. Between the flange portion 8b), axial gaps c ₁ and c _{2 of a} predetermined size are set, respectively, so that the resin ring 10 is not in contact with the metal rings 7 and 8 in the initial motion posture. Further, the followability with respect to the eccentricity of the shaft, etc. is ensured, but similarly between the engaging portion 15 and the metal rings 7 and 8 (the water / scale side engaging portion 15 and the flange portion of the third metal ring 7). 7b and between the grease-side engaging portion 15 and the flange portion 8b of the fourth metal ring 8), the axial gaps c ₃ and c ₄ are also set. Even if the joint portion 15 is provided, the eccentric followability of the resin ring 10 is not hindered. At this time, if the axial end surface 10a of the resin ring 10 and the axial end surface 15a of the engaging portion 15 (both see FIG. 2) are formed to be flush with each other, the gaps c ₁ , c ₂ , c ₃ , c _{4 are formed.} Are the same size.

  In the continuous casting machine seal 1 having the above-described configuration, as described above, the weir-like engagement portions 15 for preventing the rubber ring 11 from dropping off are integrally formed at both axial ends of the outer peripheral surface of the resin ring 10. Therefore, the rubber ring 11 can be prevented from falling off the outer peripheral surface of the resin ring 10 by engaging the rubber ring 11 with the weir-like engaging portion 15. Accordingly, it is possible to prevent the seal surface pressure from becoming unstable due to the drop-off of the rubber ring 11 and the sealing function from being impaired.

Further, when the weir-like engagement portion 15 provided in the resin ring 10 is in a structure that always contacts the metal rings 7 and 8, the resin ring 10 tends to move in the radial direction along with the eccentricity of the shaft 22. However, the seal 1 may not smoothly move in the radial direction due to contact resistance with the metal rings 7 and 8 or being sandwiched between the metal rings 7 and 8. Since the axial gaps c ₃ and c ₄ of a predetermined size are set between the two, the radial movement of the resin ring 10 is not hindered even if the engaging portion 15 is provided. Therefore, the eccentric followability of the resin ring 10 with respect to the shaft 22 can be maintained, and the deterioration of the sealing performance due to the decrease can be suppressed.

  The present invention having the above contents can be used not only as a seal for a continuous casting machine but also for various seals formed by fitting a rubber ring on the outer peripheral side of a resin ring.

Sectional drawing of the half-section of the sealing device based on the Example of this invention Single item drawing of resin ring Illustration of surface pressure distribution Half-sectional view of a sealing device according to a conventional example

Explanation of symbols

1 Continuous casting machine seal (sealing device)
2 Rubber Burning Ring 2a, 5a, 7a, 8a Tubular Part 2b Stepped Part 2c Small Diameter Part 2d Large Diameter Part 2e, 5b, 7b, 8b Flange Part 2f Caulking Tip 3 Peripheral Seal Part 4 Lip Seal 5 Spacer Ring 6 Scale seal housing ring 7,8 metal ring 9, 14 seal the housing space 10 resin ring 10a, 15a end face 11 rubber ring 12 coupling portion 13 garter spring 15 dam-shaped engaging portion 16 groove 21 housing 22 shaft w _{1, w 2} axial Width c ₁ , c ₂ , c ₃ , c ₄ axial gap

Claims (2)

Resin ring (10) slidably in close contact with the peripheral surface of the shaft (22) in an annular seal housing space (9) formed by metal rings (7) and (8) fixed to the housing (21) side And a sealing device (1) comprising a rubber ring (11) that is fitted to the outer peripheral side of the resin ring (10) and backs up the resin ring (10).
A sealing device characterized in that the resin ring (10) is provided with a weir-like engagement portion (15) for preventing the rubber ring (11) from falling off. The sealing device of claim 1.
A seal having a predetermined axial gap (c ₃ ) (c ₄ ) is set between the weir-shaped engaging portion (15) and the metal ring (7) (8). apparatus.

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