JPH0680954U - Sealing device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a sealing device that uses a resin material having low friction and high wear resistance as a sealing member, has high sealing property, and has a function of discharging a liquid to be sealed. . [Structure] An annular resin seal member 31 and an elastic seal member 32 made of a rubber-like elastic material are combined, and an elastic seal member 32 is provided on the inner side of an annular groove 5 provided on the inner circumference of the housing 2. And the resin seal member 31 is attached to the open end side of the annular groove 5, and the elastic seal member 32 pushes the resin seal member 31 against the surface of the shaft 1 to seal it in a slidable manner. The resin sealing member 31 and the elastic sealing member 32, which are brought into contact with each other and mounted in the annular groove 5, are provided with a passage 38 for discharging the liquid to be sealed to the atmosphere side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealing device applied to a bearing portion of a continuous casting machine, for example.

[0002]

[Prior art]

 A conventional sealing device of this type is, for example, one shown in FIG.

In FIG. 4, the shaft 101 is rotatably supported via a bearing 106 on an annular housing 102 provided so as to surround the outer periphery of the shaft 101. An oil seal 103, which is a sealing device, is installed at a place to prevent dust and the like from entering the inside of the bearing 106. A roll 104 is attached to the shaft 101.

The oil seals 103 provided at the two places are fitted at their outer peripheries into two mounting parts 105 formed on the housing 102, and slidably contact with the shaft 101 on the inner perimeter side. The seal lip 131 is provided, and the direction of the seal lip 131 is directed to the atmosphere side to prevent dust and water from entering the bearing 106 side. Further, a spring 132 is mounted on the outer peripheral side of the seal lip 131 to increase the tightening force.

On the other hand, a lubricant B is injected into the bearing 106 in order to lubricate the rolling elements, and in this conventional example, the lubricant B flows down to the atmosphere side through the contact surface portion of the seal lip 131 with the shaft 101. It was circulating as a state.

The reason why the lubricant B is allowed to flow down is that there is no sealing device that can cope with the lubricant B even if the lubricant B is sealed because the continuous casting machine or the like has bad environmental conditions.

[0007]

[Problems to be solved by the device]

 However, in the above-described conventional sealing device, since the seal lip 103 that comes into contact with the shaft 101 is made of a rubber-like elastic material, the sliding surface between the seal lip 103 and the shaft 101 is easily worn. . Due to the progress of the abrasion of the sliding surface, the seal surface pressure is reduced early even when the lubricant B is in a flowing state, and there is a problem that dust, water, etc., cannot intrude from the atmosphere side. . On the other hand, if the surface pressure is increased, wear of the sliding surfaces of the seal lip 103 and the shaft 101 is promoted.

Further, since the frictional resistance between the seal lip 131 and the shaft 101 is large, there is a problem that the torque loss during rotation also increases.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and its object is to use a resin material having low friction and high wear resistance as a seal member, and An object of the present invention is to provide a sealing device having a high sealing property and a function of discharging a liquid to be sealed.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention seals an annular gap between two rotating members which are concentrically and relatively rotatably assembled with each other. The elastic seal member made of a rubber-like elastic material is combined with the elastic seal member, and the elastic seal member is mounted on the inner side of the annular groove provided in one of the two rotating members, and the resin seal member is an annular member. It is mounted on the open end side of the groove, and by the elastic force of the elastic seal member, the resin seal member is pressed against the surface of the other rotating member to make slidable sealing contact, and further mounted on the annular groove. The resin sealing member and the elastic sealing member are characterized in that a passage for discharging the liquid to be sealed to the atmosphere side is formed.

Further, the elastic seal member is provided with a meat thin portion for reducing a pressing force applied to the resin seal member.

[0012]

[Action]

 In the sealing device configured as described above, the resin sealing member makes slidable sealing contact with the sliding surface to leak the liquid to be sealed to the atmosphere side and seal dust, water, etc. from the atmosphere side. The invasion of the target liquid is prevented. Since the resin material is smoother and harder than the rubber-like elastic material, the sliding resistance and wear are reduced. Further, the liquid to be sealed is discharged to the atmosphere side through the passage.

Further, when the elastic seal member is provided with a meat slack that reduces the pressing force applied to the resin seal member, the pressing force to the sliding portion of the resin seal member is weakened.

[0014]

【Example】

 The present invention will be described below based on the illustrated embodiment.

First Embodiment FIG. 1 shows a sealing device according to a first embodiment of the present invention.

That is, the sealing device of the present embodiment is a dust seal 3 for preventing the ingress of dust, water, etc. into the device in which the bearing and the like are mounted, and the shaft 1 and the outer periphery of the shaft 1 are It is for sealing the gap between the shaft 1 and the housing 2 which is concentrically and relatively rotatable relative to each other so as to surround the shaft 1. In this embodiment, the cross section provided on the inner circumference of the housing 2 is used. It is mounted in a rectangular annular groove 5.

The dust seal 3 includes a resin seal member 31 on the inner peripheral side, a rubber seal member 32 formed of a rubber-like elastic material as an elastic seal member on the outer peripheral side, The outer peripheral surface of the resin seal member 31 on the inner peripheral side and the inner peripheral surface of the rubber seal member 32 on the outer peripheral side are liquid-tightly adhered to each other. In this embodiment, the resin seal member 31 and the rubber seal member 32 are designed to move integrally in the annular groove 5 in the axial direction.

That is, the rubber seal member 32 is mounted in the inner side of the annular groove 5 provided in the housing 2 in a radially crushed state, and the resin seal member 31 opens the annular groove 5. The rubber seal member 32 is mounted on the end side and presses the resin seal member 31 against the surface of the shaft 1 by the elastic force of the rubber seal member 32 in the radial direction to slidably make sealing contact.

That is, a resin seal member 31 having low sliding resistance and high wear resistance is used as a member on the sliding side with respect to the shaft 1, and only the resin seal seat 31 is used. Since the sealing function due to the tense force cannot be obtained, the rubber seal member 32 is attached to the stationary side.

In particular, in this embodiment, the outer peripheral surface of the rubber seal member 32 is provided with a thin groove 34 in the circumferential direction, and the resin seal member 31 is attached to the shaft 1 which is a sliding member. It alleviates the tension when abutting.

The resin seal member 31 and the rubber seal member 32 are provided with a passage 38 for discharging the liquid to be sealed to the atmosphere side.

That is, slits 33 extending in the radial direction are evenly arranged in the circumferential direction on both end surfaces of the resin seal member 31 in the axial direction, and the slits 33 are formed on the outer peripheral surface of the rubber seal member 32. The slits 35 extending in the axial direction are evenly arranged in the circumferential direction. Further, on both axial end faces of the rubber seal member 32, projections 36 abutting against the groove wall surface of the annular groove 5 are circumferentially formed. They are evenly distributed.

The resin sealing member 31 is in the shape of a square ring, and its axial length is longer than the length of the rubber sealing member 32 by the height of the cylindrical protrusions 36 provided on both end surfaces. . That is, both the resin seal member 31 and the rubber seal member 32 are set to have a length slightly smaller than the annular groove 5, and the length of the resin seal member 31 in the axial direction and the cylindrical shape installed on both end faces are set. The length of the rubber seal member 32 including the height of the protrusion 36 is substantially equal.

Further, the recessed groove 34 provided along the circumferential direction on the outer peripheral surface of the rubber seal member 32 and the slit 35 provided along the axial direction are formed to have substantially the same depth.

As described above, the slits 33 provided on both sides of the resin seal member 31 and the columnar projections 36 provided on both end faces of the rubber seal member 32 form the groove wall of the annular groove 5 and the rubber seal. A gap formed between both end surfaces of the seal member 32 and a slit 35 provided on the outer peripheral surface communicate with each other to form a passage 38 that communicates from the liquid side O to be sealed to the air side A. ing.

In the dust seal having the above-described structure, the resin seal member 31 is in sliding contact with the outer periphery of the shaft 1 in a self-sealing manner, and at this sliding portion, the air side A to the liquid side O to be sealed is sealed. Infiltration of dust and water is prevented, and conversely, leakage of the liquid to be sealed from the liquid side O to be sealed to the air side A is prevented.

On the other hand, the outer peripheral side of the resin seal member 31 is sealed by a rubber seal member 32 mounted between the resin seal member 31 and the inner periphery of the housing 2. It That is, the inner circumference of the rubber seal member 32 comes into sealing contact with the outer circumference of the resin seal member 31 to seal between the rubber seal member 32 and the resin seal member 31. Further, the outer periphery of the rubber seal member 32 comes into close contact with the bottom surface of the annular groove 5 so that the rubber seal member 31 and the bottom surface of the annular groove 5 can be sealed.

When the dust seal 3 of this embodiment is used as the dust seal of the conventional continuous casting machine, the dust seal 3 of this embodiment is used instead of the oil seal shown in FIG. Mounting. Then, a lubricant such as grease for lubricating the inside of the bearing is injected, and the injected lubricant is constantly supplied from the inside of the bearing, which is the liquid side O to be sealed, to the atmosphere side A from the discharge passage 38 described above. It is discharged and the bearing can be reliably lubricated.

Further, since the resin seal member 31 having a small friction resistance and a high wear resistance is arranged in the sliding portion which comes into contact with the shaft 1, the torque loss is small, and the wear is also reduced to prolong the life. Can be realized.

In particular, since the groove is provided in the rubber seal member 32 to reduce the pressing force against the resin seal member 31, the tightening force of the resin seal member 31 on the sliding portion is weakened and the torque loss is reduced. And it is possible to reduce wear.

(Second Embodiment) FIG. 2 shows a sealing device according to a second embodiment of the present invention.

The second embodiment also has the same configuration as the first embodiment, and only different points will be described. In the second embodiment, in the middle of the passage 38, the pressure of the liquid to be sealed, such as a lubricant, becomes larger than the pressure on the atmosphere side, and when the pressure difference is less than a predetermined pressure, the passage 38 is closed and the predetermined pressure is exceeded. And a valve mechanism that opens the passage.

That is, also in the second embodiment, a plurality of slits 35 extending in the axial direction are equally arranged on the outer peripheral surface of the rubber seal member 32 in the circumferential direction, as in the first embodiment.

As shown in FIG. 2B, a thin projection 37 having a triangular cross-section is provided in the slit 35. The height of the triangular projection 37 is a rubber sheet. It is set at the same position as the outer peripheral surface of the rule member 32. Therefore, the slit 35 is always kept closed. Then, when the liquid to be sealed on the bearing side expands in volume and a minute pressure is generated, the triangular protrusion 37 is distorted and the slit 35 is opened, which functions as a valve mechanism for discharging the liquid to be sealed.

Of course, the shape of the protrusion 37 is not limited to the triangular shape, but may be another cross-sectional shape.

FIGS. 3A to 3C show various modifications of the passage structure of the above embodiment. In each of the modified examples, only parts different from the first embodiment will be described, and the same components will be denoted by the same reference numerals and description thereof will be omitted.

In FIG. 3A, neither the protrusion nor the slit is provided on the rubber seal member 32, but both end surfaces of the resin seal member 31 contacting the groove wall of the annular groove 5 and the rubber seal member 32. The slits 33 and 39 are provided on the outer peripheral surface of the resin seal member 31 whose inner periphery is in close contact.

FIG. 3B shows a rubber seal member 32 which is in close contact with the outer periphery of the resin seal member 31 and is provided with a slit 40 extending in the axial direction on the inner peripheral surface thereof.

When slits 39 and 40 are provided on the contact surfaces of the resin seal member 31 and the rubber seal member 32 as shown in FIGS. 3 (a) and 3 (b), both members are axial. Since slippage is likely to occur in the directions, it is preferable to provide a slip stopper such as unevenness or a rough surface between the contact surfaces.

In FIG. 3C, radial slits 41 extending in the radial direction are provided instead of the protrusions 36 on both axial end surfaces of the rubber seal member 32 that abuts the groove wall surface of the annular groove 5. It is a thing.

In each of the above-described embodiments, the case where the lubricant of the bearing portion of the continuous casting machine is discharged as the liquid to be sealed has been described as an example, but the present invention is not limited to discharging the lubricant, and is used for cooling. It may be used for discharging the coolant. Further, it is not limited to the seal of the bearing portion for continuous casting as described above, and in short, it prevents dust and water from entering the inside of the apparatus from the atmosphere side and prevents the liquid inside the apparatus, such as It can be widely used for discharging oil, water and various chemicals.

[0042]

[Effect of device]

 The present invention has the above-described structure and operation, and the sealing device is a combination type structure of the resin seal member and the elastic seal member, and the resin seal member is brought into contact with the mating sliding surface. In addition, the rotation torque loss can be reduced and the wear can be reduced to provide a long-life sealing device.

Moreover, by providing a passage for discharging the liquid to be sealed such as a lubricant to the atmosphere side, it is possible to simultaneously discharge the liquid to be sealed while preventing the intrusion of dust, water, etc. on the sealing sliding surface. it can.

Further, if the elastic seal member is provided with a recess for reducing the pressing force applied to the resin seal member, the tightening force of the resin seal member on the sliding portion can be weakened and the torque loss can be further reduced. It is also possible to extend the life.

[Brief description of drawings]

1 shows a sealing device according to a first embodiment of the present invention, FIG. 1 (a) is a perspective view, and FIG. 1 (b) is FIG.
FIG. 1A is a cross-sectional view at the slit position of FIG. 1A, and FIG. 1C is a view in the direction of arrow C in FIG.

2 shows a sealing device according to a second embodiment of the present invention, FIG. 2 (a) is a perspective view, and FIG. 2 (b) is FIG.
It is sectional drawing in the slit position of the sealing device of (a).

3 (a) and 3 (b) are cross-sectional views of main parts showing various modifications of the passage structure.

FIG. 4 is a cross-sectional view of a conventional sealing device.

[Explanation of symbols]

 B Grease (lubricant) 1,101 Shaft 2,102 Housing 3 Dust seal (sealing device body) 5,105 Seal groove (annular groove) 31 Resin seal member 32 Rubber seal member 33 Side slit 34 Groove (thickened) 35 Slits on the outer peripheral surface 36 Circular protrusions 37 Triangular protrusions 38 Passages 39, 40, 41 Slits

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[Procedure amendment]

[Submission date] September 3, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

3 (a) to 3 ( c ) are cross-sectional views of relevant parts showing various modifications of the passage structure.

Claims (2)

[Scope of utility model registration request] 1. An annular resin seal member and an elastic seal member made of rubber-like elastic material, which seal an annular gap between two rotating members which are concentrically and relatively rotatably assembled with each other. The elastic seal member is mounted on the inner side of the annular groove provided on one of the two rotating members, and the resin seal member is attached on the open end side of the annular groove. The elastic sealing member elastically pushes the resin sealing member against the surface of the other rotating member to make slidable sealing contact, and further, the resin sealing member and elastic seal mounted in the annular groove. A sealing device, characterized in that a passage for discharging the liquid to be sealed to the atmosphere side is formed in the member. 2. The sealing device according to claim 1, wherein the elastic seal member is provided with a meat thin portion for reducing a pressing force applied to the resin seal member.