JP4256084B2 - Rotating body seal mechanism - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a rotating body sealing mechanism, and more particularly, to a rotating body sealing mechanism interposed between a rotating drum and a stationary body used in a rotary furnace.
[0002]
[Prior art]
In general, in a rotary furnace such as a hearth rotary furnace, a pipe-shaped rotary furnace, and a kiln drum furnace, the rotary drum and the stationary body are sealed by a rotary member sealing mechanism interposed therebetween.
[0003]
Here, the rotating drum and the stationary body are both supported on the base, and the rotating drum is deformed in the axial direction or the radial direction by a rotational force or heat.
[0004]
For this reason, with such a deformation, the relative positional relationship between the rotating drum and the stationary body may change. In this case, it is difficult to seal the two. Note that the amount of deformation of the rotating drum increases as the diameter of the rotating drum increases and the temperature of the rotating drum increases, and as a result, it becomes more difficult to seal the two. Further, when the operating pressure of the rotating drum is increased by negative pressure or pressurization, the pressure difference between the inside and the outside of the seal becomes large, and sealing between the rotating drum and the stationary body becomes difficult.
[0005]
[Problems to be solved by the invention]
As a sealing mechanism for solving such a problem, a spring steel blade type seal is known (Japanese Patent Laid-Open No. 60-159585).
[0006]
However, since the blade-type seal structure made of spring steel is a structure in which the spring plates are attached to the rotating drum one by one, the gap between the portions where the spring plates and the spring plates overlap, or the spring plates There is a problem that it is very difficult to obtain a highly airtight seal mechanism because there are many leaks from the gap between the two and the rotating drum due to the difference in curvature. The present invention has been made in consideration of such points, and even when the rotating drum is deformed by the rotational force and heat, the airtightness of the seal between the rotating drum and the stationary body is ensured, and the reliability and An object of the present invention is to provide a rotating body seal mechanism with improved safety.
[0007]
[Means for Solving the Problems]
The present invention relates to a rotating body sealing mechanism interposed between a rotating body and a stationary body,
A seal plate connected to a stationary body, an expansion unit fixed to the seal plate and stretchable;
A seal box connected to the expansion section, a sleeve fixed to the rotating drum,
A seal member fixed in the seal box and in sliding contact with the outer periphery of the sleeve, and the seal plate is provided with a holding mechanism portion that regulates the operation of the seal box, and the holding mechanism portion is connected to the stationary body. has a fixed shaft provided, a pair of support plate connected to the outer circumference of the fixed shaft, engaging the stationary shaft together with the seal box, are inserted into the pair of support plates of the stationary side 1 one or more engaging portions are provided, those engaging portions of the seal box side by a pair of support plates of the stationary side, axial movement of the rotating cylinder is regulated relative to the fixed shaft, at least one The engaging portion is a rotating body sealing mechanism characterized by having a U-shape that opens outward .
[0009]
According to the present invention, even when the rotary drum is deformed by rotational force and heat, the airtightness of the rotary seal interposed between the rotary drum and the stationary body is ensured, and the reliability and safety of the rotary seal mechanism are ensured. Can be improved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 is a diagram showing a first embodiment of a rotating body sealing mechanism according to the present invention.
[0012]
As shown in FIG. 1, a rotary body sealing mechanism 9 according to the present invention is interposed between a rotary body 1 and a stationary body 2 provided in a rotary furnace such as a hearth rotary furnace, a pipe-like rotary furnace, and a kiln drum furnace. ing. Such a rotary body seal mechanism 9 includes a seal plate 6 connected to the stationary body 2 by bolts 11, a telescopic expansion portion 7 fixed to the seal plate 6, and a seal box 4 connected to the expansion portion 7. And a sleeve 3 connected to the flange portion 10 of the rotary drum 1 by a bolt 11. In the seal box 4 is fixed a seal material 5 slidably contacting the outer periphery of the sleeve 3, and the sleeve 3 has a sleeve main body 3a and a heat insulating material 17a provided on the inner periphery of the sleeve main body 3a. Further, a holding mechanism portion 8 that restricts the operation of the seal box 4 is attached to the seal plate 6.
[0013]
Among these, the holding mechanism unit 8 includes a fixed shaft 12 provided on the seal plate 6, a pair of support plates 15 and 15 connected to the outer periphery of the fixed shaft 12, and a pair provided between the support plates 15 and 15. The sliding plates 14 and 14 are provided. A bearing 13 is provided between the sliding plates 14, and the bearing 13 is fixed by a pair of support plates 15, 15 by tightening the nut 16.
[0014]
The seal box 4 is provided with engagement portions 4 a and 4 b that are inserted between the pair of support plates 15 and 15 and engage with the outer periphery of the fixed shaft 12. The distance between the pair of support plates 15 and 15 is adjusted by tightening or loosening the nut 16.
[0015]
By the way, as shown in FIGS. 2 and 3, the holding mechanism portion 8 includes a rotational torque support portion 18 and a distance holding portion 19. Among these, the one having the bearing 13 on the outer periphery of the fixed shaft 12 is a rotational torque support portion 18, and the engagement portion 4 a having an open shape is engaged with the bearing 13 of the rotational torque support portion 18. It ’s like that.
[0016]
On the other hand, the distance holding portion 19 does not have the bearing 13 on the outer periphery of the fixed shaft 12, and the engaging portion 4 b having the outer shape is engaged with the outer periphery of the fixed shaft 12.
[0017]
2 and 3, one engagement portion 4a is provided on the outer periphery of the seal box 4, and three engagement portions 4b are provided on the outer periphery of the seal box 4. A total of four engagement portions 4a and 4b are provided. ing.
[0018]
The seal material 5 is fixed to the seal box 4 by a seal holder 30 held by a nut 30a and a screw 30b. As such a sealing material 5, carbonized fiber packing which can endure high temperature of about 300-500 degree | times, the mark 3-6711 (brand name by Nippon Pillar Co., Ltd.), etc. can be used. Further, as the heat insulating material 17a, glass felt, ceramic felt or the like can be used.
[0019]
Next, the operation of the embodiment having such a configuration will be described.
[0020]
As shown in FIG. 1, when the rotating drum 1 rotates, the rotating drum 1 is deformed, or the rotating drum 1 is thermally deformed by heat from the high temperature gas in the rotating drum 1 on the rotary furnace side. When the rotary drum 1 is thus deformed, the sleeve 3 is displaced in the radial direction and the axial direction.
[0021]
When the sleeve 3 is displaced in the radial direction and the axial direction, the seal box 4 follows, and accordingly, the expansion portion 7 changes in an axial direction and a radial direction so as to be expandable and contractable. Thereby, the airtightness of the rotary body seal mechanism 9 can be ensured, and the reliability and safety can be improved. Further, by providing the distance holding portion 19, the axial movement of the engaging portion 4b is restricted by the pair of support plates 15, and the distance between the seal box 4 and the seal plate 6 can be always kept constant. Further, by providing the rotational torque support portion 18, the radial movement of the engaging portion 4 a is restricted by the bearing 13. At the same time, when an excessive torque is applied to the seal box 4, the rotational torque support portion 18 can maintain the torque applied to the seal box 4 and protect the expansion portion 7. As described above, since the movement of the seal box 4 is restricted by the holding mechanism portion 8 including the rotational torque support portion 18 and the distance holding portion 19, it is possible to prevent the seal material 5 from being detached from the seal box 4. The safety and reliability of the seal mechanism 9 can be improved.
Further, the heat transferred to the sealing material 5 by the high-temperature gas in the rotating drum 1 can be suppressed by the heat insulating material 17 a of the sleeve 3. As a result, since the temperature of the sealing material 5 can be kept low, the wear characteristics of the sealing material 5 can be improved, and the life of the sealing material 5 can be extended.
[0022]
Further, as shown in FIG. 3, a plurality of rotational torque support portions 18 and distance holding portions 19 are provided in the circumferential direction of the seal box 4, so that the radial displacement and the axial displacement of the rotary drum 1 are effective. Can be suppressed.
[0023]
Second embodiment Fig. 4 is a diagram showing a third embodiment of the present invention. As shown in FIG. 4, the rotating body sealing mechanism 9 interposed between the rotating body 1 and the stationary body 2 includes a seal plate 6 connected to the rotating body 1 by bolts 11, and is fixed to the seal plate 6 to expand and contract. A free expansion portion 7, a seal box 4 connected to the expansion portion 7, and a sleeve 3 fixed to the stationary body 2 by bolts 11, and a seal material 5 slidably contacting the outer periphery of the sleeve 3 is provided in the seal box 4. It is fixed.
[0024]
Further, the seal box 4 is provided with a holding mechanism portion 8 that regulates the operation of the seal plate 6.
[0025]
The holding mechanism portion 8 is slidably provided through the wall surface 4c of the seal box 4, and the movable shaft 12a that contacts the seal plate 6 and the wall surface 4c of the seal box 4 sandwiched between the outer periphery of the movable shaft 12a. It has a pair of attached sliding plates 14 and a pair of support plates 15 attached to the outer periphery of the pair of sliding plates 14 on the outer periphery of the movable shaft 12a. On the outer periphery of the movable shaft 12a, a pair of spring holders 21 each incorporating a spring (biasing means) 20 is attached. One spring 20 is disposed between the support plate 15 and the seal plate 6. The other spring 20 is disposed between the support plate 15 and the nut 16 attached to the movable shaft 12a.
[0026]
Other configurations are substantially the same as those of the first embodiment shown in FIG. In FIG. 4, the same parts as those of the first embodiment shown in FIG.
[0027]
By tightening the nut 16 of the holding mechanism portion 8, the elastic force of the spring 20 is determined, whereby the frictional resistance force between the tip portion 12b of the movable shaft 12a and the seal plate 6 is determined. The torque generated by the sliding resistance between the sleeve 3 and the sealing material 5 is supported by the frictional resistance between the distal end portion 12b of the movable shaft 12a and the sealing plate 6. Therefore, when an excessive torque is applied to the seal box 4 by adjusting the frictional resistance between the distal end portion 12b of the movable shaft 12a and the seal plate 6, the holding mechanism portion 8 holds the torque and the expansion portion. 7 can be appropriately protected. Further, since the movement of the seal box 4 is restricted by the holding mechanism portion 8, it is possible to prevent the seal material 5 from being detached from the seal box 4 and to improve the safety and reliability of the rotating body seal mechanism 9. Can do.
[0028]
Third embodiment Fig. 5 is a diagram showing a third embodiment of the present invention. In FIG. 5, a heat insulating part 17 fixed to the seal plate 6 is provided between the stationary body 2 and the seal plate 6.
[0029]
Other configurations are substantially the same as those of the first embodiment shown in FIG. In FIG. 5, the same parts as those of the first embodiment shown in FIG.
[0030]
In FIG. 5, the heat insulating portion 17 can keep the temperature of the sealing material 5 low and improve the wear characteristics. As a result, the life of the sealing material 5 can be extended.
[0031]
【The invention's effect】
As described above, according to the present invention, in the rotating body seal mechanism, the seal box can follow the displacement in the radial direction and the axial direction due to the deformation of the rotating body due to the rotational force and heat. . As a result, the airtightness of the seal between the rotating drum and the stationary body can be improved, leading to an improvement in the reliability and safety of the rotating body sealing mechanism.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing a first embodiment of a rotating body sealing mechanism according to the present invention. FIG. 2 is a diagram showing a holding mechanism. FIG. 3 is a diagram showing a plurality of holding mechanism units. 4 is an overall configuration diagram showing a second embodiment of a rotating body sealing mechanism according to the present invention. FIG. 5 is an overall configuration diagram showing a third embodiment of a rotating body sealing mechanism according to the present invention.
DESCRIPTION OF SYMBOLS 1 Rotating drum 2 Stationary body 3 Sleeve 3a Sleeve main body 4 Seal box 4a Engagement part 4b Engagement part 5 Sealing material 6 Seal plate 7 Expansion part 8 Holding mechanism part 9 Rotor seal mechanism 10 Flange part 11 Bolt 12 Fixed shaft 12a Movable Shaft 12b Movable shaft tip 13 Bearing 14 Slide plate 15 Support plate 16 Nut 17 Heat insulation portion 17a Heat insulation material 18 Rotary torque support portion 19 Distance holding portion 20 Spring 21 Spring holder 30 Seal holder 30a Nut 30b Screw

Claims (4)

In the rotating body sealing mechanism interposed between the rotating body and the stationary body,
A sealing plate connected to a stationary body;
An expandable expansion part fixed to the seal plate,
A seal box connected to the expansion section;
A sleeve fixed to the rotating drum;
A sealing material fixed in the seal box and in sliding contact with the outer periphery of the sleeve,
The seal plate is provided with a holding mechanism that regulates the operation of the seal box.
The holding mechanism has a fixed shaft provided on a seal plate connected to a stationary body, and a pair of support plates connected to the outer periphery of the fixed shaft,
The seal box is provided with one or a plurality of engaging portions that are inserted between the pair of support plates on the stationary body side and engage with the fixed shaft,
Those engaging portion of the seal box side by a pair of support plates of the stationary side, axial movement of the rotating cylinder is regulated relative to the fixed shaft,
At least one engaging part has the U-shaped shape opened outside, The rotary body sealing mechanism characterized by the above-mentioned.   2. The rotating body sealing mechanism according to claim 1, wherein the sleeve includes a sleeve main body and a heat insulating material provided on an inner surface of the sleeve main body.   2. The rotating body sealing mechanism according to claim 1, wherein a heat insulating portion is interposed between the stationary body and the sealing plate.   2. The rotating body sealing mechanism according to claim 1, wherein the expansion section is extendable and contractible in an axial direction and a radial direction of the rotating drum.

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