JP2005233218A - Sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device allowing to exchange the only dust lip without removing the whole of the sealing device in the case of using in the hard using condition of a continuously casting machine or the like wherein a large quantity of dust such as water, scale and powder exist and wherein the main lip can be used yet after service life of the only dust lip completes in early time. <P>SOLUTION: The sealing device is formed of a main body seal part 10 having a main lip 5 integrally formed with a fixed seal part 4, which is tightly brought in contact between a housing 11 concentrically arranged with a shaft 12 and a metal ring 2, to be slid with the shaft 12 and a dust lip 22 positioned on an open air side A of the main lip 5 and to be slid with the shaft 12 and connected to the main body seal part 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sealing device, and more particularly to a sealing device with a dust strip used in a continuous casting machine used in the field of steel and the like having severe dust conditions.

  The sealing device seals the oil and grease such as grease sealed inside the bearing so that it does not leak to the atmosphere, and prevents dust from the atmosphere from entering the lubricant such as oil and grease. However, if dust on the atmosphere side directly contacts the main lip, the dust will enter the sliding surface of the shaft and the main lip, promoting wear of the main lip and shaft, reducing the sealing performance and durability, Since problems such as deterioration of performance due to mixing with the lubricant through the sliding surface occur, those provided with dust strips for preventing dust from entering are generally used.

  FIG. 4 shows a conventional sealing device 101 provided with a dust lip 106. The sealing device 101 includes a metal ring 102 having an L-shaped cross section and an elastic body portion 103 made of a rubber-like elastic body that is vulcanized and bonded so as to cover the metal ring 102. The elastic body portion 103 includes a fixed sealing portion 104 positioned on the outer peripheral side of the metal ring 102, a main lip 105 on the inner peripheral side of the metal ring 102, and a dust lip 106 positioned on the atmosphere side A from the main lip 105. A concave portion 109 for attaching a garter spring 108 is provided on the outer peripheral side opposite to the lip edge of the main lip 105.

  In this sealing device 101, since the dust lip 106 is located on the atmosphere side A from the main lip 105, the supply of lubricant from the sealing fluid side to the sliding portion is insufficient and is directly exposed to water and the atmosphere. Due to the severe conditions, the lip life generally tends to be shorter than the main lip 105. However, since the dust lip 106 is integrally formed with the main lip 105, the sealing device 101 including the main lip 105 is used when the life of the dust lip 106 ends, even though the main lip 105 is still usable. Had to replace the whole.

  In JP-A-2000-161498, in addition to a dust lip integrated with a main lip for the purpose of improving the sealing performance against dust, a second dust lip is further provided, and a sealing device in which the dust lip is located on the sealing fluid side. It has been proposed that the dust lip is separated from the main lip from the viewpoint of assembling and mounting properties. However, the object of the present invention is different from that of the present invention, and the present invention has not been disclosed at all.

JP 2000-161498 A

  The present invention has been made in view of the above-mentioned problems, and is used in severe conditions such as continuous casting machines where a large amount of dust such as water, scale, powder, etc. is present, and the life of the dust lip is terminated early. However, it is an object of the present invention to provide a sealing device in which only the dust lip can be replaced without removing the entire sealing device when the main lip is still usable.

  In order to achieve the above object, a sealing device according to claim 1 of the present invention is integrally formed with a fixed sealing portion in close contact between a metal ring and another member disposed concentrically with one member. A main body seal portion having a main lip that slides on the member, and a sub seal portion having a dust lip that is positioned on the atmosphere side of the main lip and that slides on the one member and is coupled to the main body seal portion; It is characterized by comprising.

  Moreover, the sealing device according to claim 2 of the present invention is characterized in that a plurality of the sub-seal portions are continuously connected in the axial direction.

  The present invention has the following effects.

  In other words, the sealing device of the present invention having the above-described configuration is used in severe conditions such as a continuous casting machine where a large amount of dust such as water, scale, powder, etc. is present, and only the life of the dust strip is terminated early. However, when the main lip is still ready for use, the secondary seal portion having the dust strip is provided separately from the main body seal portion, so that only the dust strip can be replaced without replacing the entire sealing device. . In addition, since the dust lip is positioned on the atmosphere side and coupled to the main body seal portion, only the dust lip can be easily replaced without removing the main body seal portion.

  Further, since the sub seal part is independent from the main body seal part, only a plurality of sub seal parts can be connected to the main body seal part in succession, thereby extending the life of the dust lip and improving the dust lip. The number of exchanges can be reduced, and the sealing effect against dust can be further improved.

  Preferred embodiments of the present invention will be described below with reference to the drawings. However, the scope of the present invention is not intended to be limited to the contents described in this embodiment unless otherwise specified.

FIG. 1 shows a cross section of a main part of a sealing device 1 according to a first embodiment of the present invention, which is configured as follows.
The sealing device 1 includes a main body seal portion 10 and a sub seal portion 20. The main body seal portion 10 includes a first flange portion 2b extending in the radial direction from one end of the first cylindrical portion 2a and the atmosphere side A of the first cylindrical portion 2a toward the shaft 12, and the shaft 12 side of the first flange portion 2b. A second cylindrical portion 2c extending in the axial direction from one end toward the sealing fluid side B and a second flange portion 2d extending in the radial direction from one end of the sealing fluid side B of the second cylindrical portion toward the shaft 12 side. And an elastic body portion 3 made of a rubber-like elastic body that is vulcanized and bonded so as to cover the metal ring 2. The elastic body portion 3 is a housing for connecting a sealing fluid side fixed sealing portion 4a, which is located on the outer peripheral side of the first cylindrical portion 2a of the metal ring 2 and is in close contact with the housing 11, and a sub seal portion 20 described later. A fixed sealing portion 4 constituted by an atmosphere-side fixed sealing portion 4b provided with a space between and a flange-side fixed sealing portion 4c located on the atmosphere side A of the first flange portion 2b of the metal ring 2; A seal lip portion 6 having a main lip 5 inclined toward the sealing fluid side B on the inner peripheral side of the metal ring 2, and the outer peripheral side opposite to the lip edge 7 of the main lip 5 A recess 9 for mounting the garter spring 8 is formed in the.

  At a position on the atmosphere side A from the main lip 5, there is provided a sub-seal portion 20 having a dust strip 22 that is vulcanized and bonded to the reinforcing ring 21 and that is inclined toward the atmosphere side A and slides on the shaft 12. The sub seal portion 20 is connected to the main body seal portion 10 by the atmosphere side fixed sealing portion 4 b and the flange side fixed sealing portion 4 c through the reinforcement space 21, and the atmosphere side fixed sealing portion 4 b and the cylindrical portion 21 a of the reinforcing ring 21. A gap 23 is formed between the housing side surface of the outer peripheral portion 22a of the dust lip 22 coupled via the housing 11 and the housing 11 so that the sub seal portion 20 can be easily detached from the main body seal portion 10.

  Since the dust lip 22 is provided separately from the main lip 5, the sealing device 1 of the present invention having the above-described configuration is sealed when the life of the dust lip 22 ends when the main lip 5 is still usable. It is possible to replace only the secondary seal portion 20 having the dust strip 22 without replacing the entire apparatus 1. In addition, the dust lip 22 is located on the atmosphere side, and the housing side surface of the outer peripheral portion 22a of the dust lip 22 connected through the cylindrical portion 21a of the reinforcing ring 21 is connected between the housing 11 and the atmosphere side fixed sealing portion 4b. Since the gap 23 is formed, only the sub seal part 20 having the dust strip 22 can be easily attached and detached without taking out the main body seal part 10.

  FIG. 2 shows a second embodiment which is another aspect of the present invention. The sub seal part 20 is composed only of a dust strip 22 which is an elastic body without having a reinforcing ring, and is arranged on the inner peripheral side of the second cylindrical part 2c of the metal ring 2 which is the seal lip part 6 of the main body seal part 10. The main body seal portion 10 is coupled to the inner peripheral portion 6a located and the atmospheric side portion 6b located on the atmospheric side A of the second flange portion 2d of the metal ring 2. Also in this embodiment, since the dust lip 22 is formed separately from the main lip 5 and exists on the atmosphere side A from the main lip 5, only the dust lip 22 is attached and detached without removing the main body seal portion 10. be able to.

  Further, FIG. 3 shows a state in which a plurality of sub-seal parts 20 are connected in series and connected to the main body seal part 10. By making the dust seals 22 separate from the main lip 5, it becomes possible to connect a plurality of dust seals 22, thereby improving the sealing performance against dust and extending the life of each dust seal 22. In this example, two sub-seal portions 20 are connected, but the number of sub-seal portions 20 to be joined is appropriately selected depending on the usage situation.

  In addition, although the reinforcement ring 21 of the sub seal part 20 is couple | bonded by the main body seal part 10 and the fixed sealing part 4 in a present Example, you may couple | bond with the metal ring 2 of the main body seal part 10 directly.

Sectional drawing of the sealing device of Example 1 which concerns on this invention Sectional drawing of the sealing device which concerns on another Example 2 of this invention. Sectional drawing of the sealing device which concerns on another Example 3 of this invention. Sectional drawing of the sealing device which concerns on the prior art Example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing device 2 Metal ring 2a, 2c Cylindrical part 2b, 2d Flange part 3 Elastic body part 4 Fixed sealing part 4a Sealing fluid side fixed sealing part 4b Atmospheric side fixed sealing part 4c Flange side fixed sealing part 5 Main lip 6 Seal lip part 7 Lip edge 8 Garter spring 9 Recess 10 Main body seal part 11 Housing 12 Shaft 20 Sub seal part 21 Reinforcement ring 21a Cylindrical part 22 Dustrip 22a Outer peripheral part 23 Clearance A Atmosphere side B Sealed fluid side

Claims (2)

  A main body seal portion integrally formed with a fixed sealing portion in close contact with another member disposed concentrically with the one member and a metal ring, and having a main lip that slides on the one member; And a sub-seal portion having a dust lip that is positioned on the side and slides on the one member and is coupled to the main body seal portion.   The sealing device according to claim 1, wherein a plurality of the sub seal portions are continuously connected in the axial direction.

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