JP2004053217A - Sealing device of rotary cylinder device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device of high sealability even to the deflection of a rotary cylinder device during its operation and abrasion with age. <P>SOLUTION: This sealing device seals a part between a cylindrical body 10 axially rotated by a driving source and a ground-fixed rotary body fitted to each other at their end parts. An end part of the non-rotary body 1 is inserted into an end part of the cylindrical body 10, and a sealing cylinder 20 is mounted between an end part inner face of the cylindrical body 10 and an end part outer face of the non-rotary body 1. Further the sealing cylindrical body 20 is supported to a fixed support in a balanced state at an approximately load central position 51. A part between the sealing cylindrical body 20 and the non-rotary body 1 are air-tightly sealed by a first sealing means, and a part between the sealing cylindrical body 20 and the non-rotary is air-tightly sealed by a second sealing means. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
The present invention relates to a sealing device in a rotary cylindrical device such as a horizontal rotary dryer or a rotary kiln in which a rotary cylinder is rotatably supported.
[0002]
[Prior art]
A typical example of a conventional horizontal rotary dryer is a so-called steam tube dryer.
[0003]
As shown in FIG. 1, the steam tube dryer includes a rotating cylinder 10 that is rotatable around the axial direction, and rotates the rotating cylinder 10 to remove the object to be dried loaded from one end of the rotating cylinder 10. In the process of discharging from the other end side, drying is performed in the rotary cylinder 10 by heating steam as external heat for drying.
[0004]
More specifically, the rotary cylinder 10 has a length of, for example, 10 m to 30 m. In the rotary cylinder 10, steam heated by using a wet powder or a granular powder as a heat medium is connected to a heating pipe 111. While being dried by being brought into contact with the rotary cylinder, the rotary cylinder is continuously moved while being sequentially moved to the discharge port 112 as the rotary cylinder rotates.
[0005]
Therefore, the rotary cylinder 10 is installed with a slight downward slope in order to smoothly transfer the raw material from the raw material (dry product) inlet 121 at one end to the dry product discharge port 112. The rotating cylinder is supported via tires 114, 114 on bearing rollers 130, 130 provided on the two bases 131, 131, respectively. , 131 and the height and angle of the bearing rollers 130, 130.
[0006]
On the other hand, in order to rotate the rotary cylinder 10, a driven gear 150 is provided around the rotary cylinder 10. A driven gear 153 meshes with the driven gear 150, and the rotational force of the prime mover 151 is transmitted through the speed reducer 152. Then, the rotary cylinder rotates around its axis.
[0007]
Further, in the steam tube dryer, a number of heating tubes 111 are arranged between both end plates of the rotating cylinder in parallel with the axis, and heated steam as a heat medium is attached to the rotating joint 160 to these heating tubes 111. After being supplied through the supplied heat medium inlet pipe 161 and flowing through the respective heating pipes 111, it is discharged through the heat medium outlet pipe 162.
[0008]
On the other hand, at the end of the rotary cylinder 10, a gas inlet 113 is provided in communication with the outlet 112, and the gas is exhausted from the gas outlet 122 on the other end together with the evaporative gas in the rotary cylinder 10. It has become so.
[0009]
This type of horizontal indirect heating dryer is characterized by a large superheated area per volume, a large drying capacity, a high heat transfer rate, no need for exhaust gas treatment equipment, and easy operation. It is widely used because it has advantages such as
[0010]
[Problems to be solved by the invention]
However, in this type of rotating cylinder device, sealing is an important issue. In particular, the feed section having the material (drying material) inlet 121 at one end is fixed to the ground, whereas the rotary cylinder 10 rotates around the axis, and the length of the rotary cylinder 10 may be long. In addition, it is practically difficult for the rotary cylinder 10 to rotate with the coaxial center due to the inevitable mechanical error of the rotary cylinder 10 or the wear in the operation process with respect to the feed portion. It becomes.
[0011]
When outside air enters the rotary cylinder, the physical properties change, and the quality of the dried product deteriorates. Further, if the seal is poor, hot air leaks into the atmosphere, resulting in a decrease in drying efficiency.
[0012]
As means for sealing a portion that rotates with an error for this purpose, a labyrinth mechanism, a sliding mechanism using the elasticity of rubber or a spring, a ball bearing mechanism in Japanese Patent No. 3165959, and others are disclosed in Japanese Patent No. 3209895. There are also those described in JP-A-58-82 and JP-B-45-16062.
[0013]
However, in any case, the sealing property is not satisfactory.
[0014]
Accordingly, a main object of the present invention is to provide a sealing device that exhibits excellent sealing properties in a rotating cylinder device, and particularly exhibits excellent sealing properties against run-out of a rotating cylinder due to wear during operation or aging. It is in.
[0015]
[Means for Solving the Problems]
The present invention that has solved the above problems is as described below.
<Invention according to claim 1>
In a device that seals between a cylindrical body that is rotated around an axis by a driving source and end portions in a fitted state, and a non-rotating body fixed to the ground,
When one of the cylindrical body and the non-rotating body is a first body and the other, which is a nested member, is a second body, an end face of the first body and an end face of the second body Between, a seal cylinder is interposed,
This seal cylinder is supported in a balanced state at a substantially load center position with respect to the fixed base,
The sealing cylinder and the first body are hermetically sealed by a first sealing means, and the sealing cylinder and the second body are hermetically sealed by a second sealing means. A sealing device for a rotary cylindrical device.
[0016]
(Effect)
In the present invention, the seal cylinder is supported in a balanced state at the substantially center of the load with respect to the gantry. Therefore, when the cylinder rotates while swinging with respect to the non-rotating body fixed to the ground, the seal cylinder also swings with the following tendency. In this case, even if the seal cylinder also oscillates, the oscillation does not completely follow the oscillation of the cylinder, but oscillates in a buffered state, so that the seal between the seal cylinder and the cylinder, and the seal cylinder And a non-rotating body.
[0017]
<Invention according to claim 2>
A support extending longitudinally on the fixed base is supported at a first position, and a sealing cylinder is supported by the support at a second position substantially corresponding to the center of gravity of the support, with respect to the second position. A weight is provided for the support at a position opposite to the first position with respect to the support, and the seal cylinder is supported on the fixed base in a balanced state with the first position as a fulcrum. The sealing device for a rotary cylindrical device according to claim 1.
[0018]
(Effect)
The seal cylinder itself is supported by the support at the second position substantially corresponding to the center of gravity, so that the seal cylinder itself is supported in a substantially horizontal state without protruding. Therefore, the follow-up movement of the seal cylinder is smoothly performed in accordance with the swing of the rotary cylinder, particularly in the vertical method. Then, the seal cylinder is supported on the fixed base in a balanced state with the first position as a fulcrum by the balance mechanism, so that the seal cylinder smoothly follows the runout around the rotation axis of the rotary cylinder. Become like
[0019]
<Invention of Claim 3>
3. The sealing device for a rotary cylindrical device according to claim 1, further comprising a heat removal means for removing heat generated by the seal cylinder by a cooling medium flowing therethrough.
[0020]
(Effect)
Heat is generated due to sliding or contact between the sealing cylinder and the rotating cylinder and / or the non-rotating body. However, if a heat removal means for removing heat by a cooling medium (for example, water) that circulates heat generated by the seal cylinder is provided, it is possible to prevent damage and thermal deformation of the seal cylinder and to prevent a decrease in sealing performance.
[0021]
<Invention of Claim 4>
4. An end portion of the second body opposite to the insertion side with respect to the first body and an outer surface of the rotary cylinder are connected by a flexible joint to achieve sealing. A sealing device for a rotary cylindrical device according to item 1.
[0022]
(Effect)
By connecting a flexible joint between an end of the second body opposite to the insertion side with respect to the first body and an outer surface of the rotary cylinder, the axial movement of the rotary cylinder and the rotation of the rotary cylinder are achieved. Sealing can be achieved while absorbing run-out around the axis.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
If a rotary steam dryer is described as an example of the rotary cylinder device according to the present invention, it will be apparent that the same applies to other rotary cylinder devices. In the present invention, one of the cylindrical body and the non-rotating body is a first body, and the other nested body is a second body. In the following embodiments, the cylindrical body is an example of a first body and a non-rotating body is a nested second body. However, the reverse configuration (that is, the end of the cylindrical body is nested at the end of the non-rotating body). It is clear that the configuration to be inserted is also assumed, and the description of the configuration is omitted.
[0024]
First, referring to FIGS. 1 to 3, the end of the non-rotating body 1 is inserted into the left end of the rotary cylinder 10 in a nested manner. The non-rotating body 1 is fixed to the base (fixed to the ground). Inside the non-rotating body 1, a screw conveyor 2 driven by a motor 3 for supplying a raw material (a product to be dried) at one end from the charging port 121 into the rotary cylinder 10 is provided.
[0025]
The fitted state of the rotating cylinder 10 and the non-rotating body 1, particularly the fitted state with the sealing tubular body 20 interposed therebetween, will be further described with reference to FIGS. A cylindrical stuffing box 11 is integrally fixed as a whole with the left end open.
[0026]
The cylindrical sealing cylinder 20 is fitted on the outer surface of the end of the non-rotating body 1 and is fitted on the inner surface of the stuffing box 11 of the rotating cylinder 10. An air seal chamber 21 is formed on the right end of the seal cylinder 20, and a cooling chamber 22 is formed on the left side thereof. Between the outer surface of the air seal chamber 21 and the inner surface of the stuffing box 11, a first seal body 32 such as a V-packing is provided, although not shown in detail. In addition, an inert gas introduction pipe from the outside communicates with the inside of the air seal chamber 21. For example, nitrogen gas is blown into the air seal chamber 21 through the inert gas introduction pipe, and the air seal chamber 21 is pressurized. It is blown out between the second seal body 32 and the inner surface of the stuffing box 11 to achieve sealing. Therefore, the first sealing means of the present invention is constituted by the V packing and the inert gas blowing means. On the other hand, in the present embodiment, a cooling water introduction pipe is connected to the cooling chamber 22 as a cooling medium, and the cooling water is introduced by cooling the cooling chamber 22 and cooling the heat generated by sliding of the entire seal cylinder 20. It constitutes a heat removal means for heating.
[0027]
The flange 20a at the left end of the seal cylinder 20 and the flange 1a protruding from the outer surface of the non-rotating body 1 are connected by a bellows tube 40 as a flexible joint. Therefore, the bellows tube 40 constitutes a second sealing means for sealing between the inner surface of the sealing cylinder 20 and the outer surface of the non-rotating body 1.
[0028]
On the other hand, as shown in FIGS. 3 and 4, at a position between the flange 20 a of the seal cylinder 20 and the flange 1 a protruding from the outer surface of the non-rotating body 1, for example, at intervals of 120 degrees in the circumferential direction. The stopper 41 is protruded at a distance, and the stopper bolts 1b, 1b, 1b are fixed to the outer surface of the non-rotating body 1 to face the stopper 41. Therefore, the rotation of the seal cylinder 20 that is going to rotate together with the rotation cylinder 20 in the direction of the arrow in FIG. 4 is prevented.
[0029]
As mentioned above, when the cylinder 10 rotates while swinging with respect to the non-rotating body 1 fixed to the ground, the seal cylinder 20 also swings with a following tendency. In this case, even if the seal cylinder 20 also oscillates, the oscillation does not completely follow the oscillation of the cylindrical body 10 and swings in a buffered state. The sealing function by the sealing means and the sealing function by the first sealing means between the sealing cylinder 20 and the non-rotating body 1 are still exhibited.
[0030]
In the present invention, a configuration is adopted in which the seal cylinder 20 is supported in a balanced state at the load center position, that is, at the fulcrum 51, with respect to the gantry 50 via a bracket 20A fixed thereto.
[0031]
Specifically, a balance mechanism is provided on each side of the seal cylinder 20, and is supported by the gantry 50 in a balanced state. More specifically, a support body 52 extending in the longitudinal direction is supported on a gantry 50 fixed to the ground at a first position, that is, at a fulcrum 51 composed of a horizontal axis orthogonal to the axis of the seal cylinder 20, The body 20 is supported by the support 52 at a second position substantially corresponding to the center of gravity, that is, at a center of gravity support point 53 composed of a horizontal axis orthogonal to the axis of the seal cylinder 20.
[0032]
The weights 54, 54,... Are provided on the support 52 at positions on the opposite side of the fulcrum 51 (first position) with respect to the center of gravity fulcrum 53 (second position). The seal cylinder 20 is supported on the fixed base 50 in a balanced state with the fulcrum 51 as a fulcrum. The balance is maintained by the number and the installation positions of the weights 54, 54. In the embodiment, the small weight 56 is screwed back and forth along a screw rod 55 provided near the center of gravity 53. The balance is finely adjusted.
[0033]
In this case, the deflection of the seal cylinder 20 in the vertical plane direction can be absorbed mainly by the rotation of the center of gravity fulcrum 53 about the axis. Although not shown in detail, the run-out of the seal cylinder 20 in the horizontal plane is absorbed mainly by the horizontal clearance secured at the center of gravity 53. Oblique swings can be absorbed by their combination.
[0034]
On the other hand, in the above embodiment, the center of gravity of the seal cylinder 20 and the center of gravity fulcrum 53 are aligned in the axial direction so that the seal cylinder 20 can be smoothly raised and lowered along with the rotation of the rotary cylinder 20. It is. However, for example, when the rotating cylinder 20 and the non-rotating body 1 are placed in different positions in the fitting mode, and the center of gravity of the sealing cylinder 20 is outside the opening end surface of the rotating cylinder 20, the bearing at the center of gravity support point is used. However, the above-mentioned balance mechanism need not be adopted.
[0035]
Further, in the above embodiment, the support pins and the clearance are provided to allow the deflection in the vertical direction and the horizontal direction. However, if a ball bearing or the like is used, both the vertical direction and the horizontal direction are used. Can absorb vibration.
[0036]
【The invention's effect】
INDUSTRIAL APPLICABILITY As described above, according to the present invention, there is provided a sealing device that exhibits excellent sealing properties in a rotary cylinder device, and particularly exhibits excellent sealing properties against runout of a rotating cylinder due to wear during operation or aging. And other advantages. As a result, the physical properties change due to the intrusion of the outside air, and the quality of the dried product is not deteriorated, the seal is not good, the hot air leaks to the atmosphere, and the drying efficiency is not reduced. Further, the wear of the seal parts is small, the maintenance frequency is low, and stable operation can be performed for a long period.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a horizontal rotary dryer according to the present invention.
FIG. 2 is a longitudinal sectional view of a main part on the loading side of a non-dried product.
FIG. 3 is a horizontal vertical sectional view for explaining the outline.
FIG. 4 is a cross-sectional view for explaining the outline.
FIG. 5 is a plan view of a main part.
FIG. 6 is a front view of a balance mechanism for balance.
FIG. 7 is a side view thereof.
FIG. 8 is a schematic perspective view showing a seal cylinder and a balance mechanism for balance.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Non-rotating body, 10 ... Rotating cylinder, 11 ... Stuffing box, 20 ... Seal cylinder, 20A ... Bracket, 21 ... Air seal chamber, 22 ... Cooling chamber, 32 ... First seal body, 40 ... Bellows pipe, 50 ... Stand, 51... Fulcrum (first position), 52... Support, 53... Center of gravity fulcrum (second position), 54.

Claims (4)

In a device that seals between a cylindrical body that is rotated around an axis by a driving source and end portions in a fitted state, and a non-rotating body fixed to the ground,
When one of the cylindrical body and the non-rotating body is a first body and the other, which is a nested member, is a second body, an end face of the first body and an end face of the second body Between, a seal cylinder is interposed,
This seal cylinder is supported in a balanced state at a substantially load center position with respect to the fixed base,
The sealing cylinder and the first body are hermetically sealed by a first sealing means, and the sealing cylinder and the second body are hermetically sealed by a second sealing means. A sealing device for a rotary cylindrical device. A support extending in a longitudinal direction is supported on the fixed base at a first position, and a sealing cylinder is supported on the support at a second position substantially corresponding to the center of gravity of the support. A weight is provided for the support at a position opposite to the first position with respect to the support, and the seal cylinder is supported on the fixed base in a balanced state with the first position as a fulcrum. The sealing device for a rotary cylindrical device according to claim 1. 3. The sealing device for a rotary cylindrical device according to claim 1, further comprising a heat removal means for removing heat generated by the seal cylinder by a cooling medium flowing therethrough. 4. An end portion of the second body opposite to the insertion side with respect to the first body and an outer surface of the rotary cylinder are connected to each other by a flexible joint and sealed. A sealing device for a rotary cylindrical device according to item 1.

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