JP2006162127A - Heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating system having a seal device without receiving influence of heat in a furnace with a simple constitution. <P>SOLUTION: The seal device 23 has a fixed flange part 12 arranged in a cylindrical end part 11 of one furnace 10, and a movable flange part 27 arranged in a cylindrical end part 21 of the other furnace 20. The movable flange part and the cylindrical end part of the other furnace for supporting the flange part, are connected by inner-outer elastic cylindrical bodies 24 and 25 expandable in the axial direction, deflectable in the radial direction and different in a diameter. An inside annular space 30 communicating with the furnace inside of the other furnace is formed between the inner elastic cylindrical body 24 and an outer peripheral surface of the cylindrical end part of the one furnace. An inner chamber 27A communicating with a void is formed in the movable flange part 27. An air sending means 32 is provided for supplying pressurized gas in the inner chamber, and the other air sending means 31 is arranged for supplying the pressurized gas to an outside annular space 29 formed between the inner elastic cylindrical body and the outer elastic cylindrical body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention has a heating device, in particular, two furnaces that rotate relative to each other, and both furnaces deliver the material to be heated from one furnace to the other while the cylindrical ends of each other rotate relative to each other. The present invention relates to a heating device having a sealing device between end portions.

  As a heating apparatus that connects two furnaces that rotate relative to each other, there is an apparatus disclosed in Patent Document 1.

  In the apparatus of Patent Document 1, one furnace is a vertical primary firing furnace that rotates, and the other furnace is a horizontal secondary firing furnace that rotates. Both furnaces can be connected either by using a connecting body having an inclined cylindrical body with a connecting portion at one end connected to the cylindrical end of one furnace and a connecting portion connected to the cylindrical end of the other rotary furnace at the other end. The part also allows relative rotation with the cylindrical end of the corresponding furnace to rotate.

In the connecting portion, a radial gap is formed so as to allow relative rotation with both furnaces. Since the connection portion is exposed to a high temperature, it is deformed due to thermal expansion. In addition, a large furnace cannot be concentric with high accuracy in manufacturing, and the gap is relatively large. If there is a gap, the material to be heated enters the gap or gas leakage occurs, which is not preferable. First, when a granular material to be heated enters the gap, so-called galling occurs, increasing the frictional resistance against rotation. Moreover, when the high temperature gas in the furnace leaks, the temperature of the connection portion is increased and deformation due to thermal expansion is caused, and the leaked gas may worsen the environment.

  Therefore, in general, a sealing device that performs sealing while allowing relative rotation is used for the connecting portion. In the above-mentioned Patent Document 1, the connection portion on one furnace side has a so-called water seal, and the seal on the connection portion on the other furnace side is not particularly described. The latter seal may be ground packing as a general means.

Further, without using the above connection body, flanges that are in sliding contact with each other in accordance with the relative rotation of both furnaces are provided in both furnaces, and the flange of one furnace is moved in the axial direction with respect to the flange of one furnace. The flange is pressed by a spring plunger at a plurality of positions in the circumferential direction of the flange, the axial position fluctuation due to thermal expansion is absorbed by the spring plunger, and the flanges are always in sliding contact to minimize leakage as much as possible. Is also possible.
JP-A-4-20785

  However, there is a point which should be improved also in the sealing device in patent documents 1.

  First, since the connecting portion of the connecting body is located below the vertical primary firing furnace, the water seal is provided with a groove ring that opens upward in the connecting portion, and water is poured into the groove ring to form a primary seal. The firing furnace is sealed while allowing relative rotation by providing a plate-like ring that hangs down into the water. However, due to the high temperature from the inside of the furnace or the evaporation of water due to long-term use, water may be lost and sealing may not be possible. To prevent this, you should always check for the presence of water.

  Next, the seal between the secondary firing furnace is no longer usable because the secondary firing furnace is a horizontal type. Therefore, although gland packing is used, gland packing involves friction and leads to an increase in the required rotational torque of the furnace. In addition, this friction causes wear of the gland packing and reduces the sealing performance. Furthermore, exposure to high temperatures causes alteration in the gland packing, and in this respect as well, wear and, consequently, sealing properties are reduced.

  Furthermore, when a flange is provided in both furnaces and a spring plunger is used, the spring plunger has a structure in which a movable plunger is elastically pressed by the spring, so the spring force is proportional to the amount of axial displacement of the plunger. Increases or decreases. As a result, if the axis lines of both furnaces are tilted or bent, the amount of axial displacement varies depending on the circumferential position, so the elastic pressure is not constant and leakage cannot be prevented uniformly. Further, since it cannot be displaced in directions other than the axial direction, it cannot cope with displacement due to inclination or bending with respect to the rotational axis. In order to cope with this, the spring plunger must be supported by a mechanism that enables automatic alignment with respect to the inclination, which complicates the mechanism.

  In view of such circumstances, the present invention has a simple configuration, extremely low frictional resistance, is not affected by heat in the furnace, has some manufacturing errors or dimensional variations over time, and dimensions during operation. It is an object of the present invention to provide a heating device having a sealing device that can cope with fluctuations.

  In the heating apparatus according to the present invention, the cylindrical ends of two furnaces that rotate relative to each other are loosely connected concentrically on a common axis so that the heat-treated material is transferred from one furnace to the other furnace. A sealing device is provided between the two cylindrical end portions to allow relative rotation between the two cylindrical end portions.

  In such a heating device, in the present invention, the sealing device includes a fixed flange portion fixed to the outer peripheral surface so as to have a radially extending surface on the outer peripheral surface of the cylindrical end portion of one furnace. A movable flange portion which is provided at the cylindrical end portion of the other furnace so as to be movable in the axial direction and which faces the fixed flange portion so as to slide or form a minute gap. The movable flange portion and the cylindrical end portion of the other furnace that supports the movable flange portion are connected by inner and outer elastic cylinders that are extendable in the axial direction and have different flexible diameters in the radial direction. And an inner annular space that communicates with the interior of the furnace of the other furnace, and an inner chamber that communicates with the gap is formed in the movable flange portion. While having an air supply means for supplying pressurized gas to the inner chamber, It is characterized in that the other blowing means for supplying to the outer annular space pressurized gas is formed between the elastic cylindrical body and the outer flexible tubular member is provided.

  In the present invention having such a configuration, the inner elastic cylinder body and the outer elastic cylinder body can be expanded and contracted in the axial direction and are flexible in the radial direction, so that they can be subjected to relative displacement in any direction between the fixed flange portion and the movable flange portion. The two flanges are always parallel and the sliding contact or gap is constant. In addition, since the pressing force of the movable flange portion to the fixed flange portion is determined by the pressure of the gas sent to the outer annular space formed between the inner elastic cylinder and the outer elastic cylinder, as long as this gas pressure is constant The pressure is constant regardless of the axial displacement of both furnaces. Also, even if a narrow gap is formed between the flanges, the gas from the inner annular space flows outward through this gap, so there is no intrusion of dust, etc. from the outside, and no outflow of gas in the furnace. The seal is almost complete. Further, the cooling of the flange portion by the gas prevents the flange portion from being thermally deformed.

  In the present invention, the inner elastic cylinder and the outer elastic cylinder can be formed of, for example, a bellows.

  In the present invention, it is preferable that at least one of the fixed flange portion and the movable flange portion has a sliding member or a sliding layer having a lower friction than the flange base material on the facing portion. The frictional resistance at the time of sliding contact between both flanges, and hence the wear, can be minimized. At that time, if these sliding members or sliding layers have elasticity in the thickness direction, the closeness of the surface at the time of sliding contact increases, and the sealing effect is improved.

  In the present invention, one furnace having a fixed flange can be rotated, and the other furnace provided with a movable flange can be non-rotated. By doing so, air can be easily supplied to the elastic cylinder provided in the other non-rotating furnace.

  In the present invention, as described above, the flange portion is provided at the cylindrical end portions of the two furnaces that rotate relative to each other, the gas is circulated between the two flanges, and the axial position is fixed. Since the other flange is movable in the axial direction with respect to the flange portion, and the movable flange is urged in the axial direction by the gas pressure, the sliding contact seal is non-contact sealed by the gas flow between the flanges. In addition, the flange portion can be cooled, so that no dust or the like enters from the outside and no gas leaks from the inside of the furnace. In addition to this, thermal deformation at the flange portion is small, and the sealing characteristics can be maintained. Furthermore, the other flange part always follows one flange part, and the sliding contact pressure between the flange parts can be kept constant, or the gap is kept constant, regardless of the production / positional accuracy and operating conditions, Increases sealing performance and reduces the amount of gas consumed.

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

In FIG. 1, the first furnace 10 and the second furnace 20 are loosely fitted with a radial gap δ ₀ so that the cylindrical end portion 11 and the cylindrical end portion 21 allow relative rotation to each other. In the present embodiment, the first furnace 10 rotates around the rotation axis X, and the second furnace 20 is not rotated. The cylindrical end 11 and the cylindrical end 21 are concentric with a common axis X. In the present embodiment, the first furnace 10 and the second furnace 20 are both horizontal furnaces. However, the present invention is not limited to this. For example, the first furnace 10 is a vertical furnace and is connected to the second furnace 20. Only the cylindrical end portion 11 may have an axis along the axis X.

  In the present embodiment, the material to be heat treated is preheated in the rotating first furnace 10, passes through the cylindrical end portion 21 from the cylindrical end portion 11, and as shown by an arrow A in FIG. After being dropped and transferred to the furnace 20 and subjected to a predetermined heat treatment in the second furnace 20, it is taken out of the second furnace 20 as a product.

  On the outer surface of the cylindrical end portion 11 of the first furnace 10 to be rotated, an annular plate-shaped fixing flange portion 12 extending in the radial direction is attached at a position slightly away from the end edge. Here, “fixing” of the fixing flange means that the axial position is fixed. The fixed flange portion 12 is made of metal, for example, a steel plate, and is fixed to the outer peripheral surface of the cylindrical end portion 11 by welding or the like. A double concentric annular groove is formed on the right flange surface of the fixed flange 12, and an annular sliding member 12A protruding from the flange surface is attached to each annular groove. The sliding member 12A is made of a softer and lower friction material than the fixed flange 12, for example, a resin such as a copper alloy or Teflon (registered trademark). Further, the sliding member 12A may be formed as a sliding layer on the fixed flange surface by coating or the like, and preferably has greater elasticity than the base material in the thickness direction.

  The non-rotating second furnace 20 has a flange-like attachment portion 22 at the cylindrical end portion 21, and an elastic cylinder assembly 23 as a sealing device between the two furnaces is attached thereto. .

  The elastic cylinder assembly 23 has two elastic cylinders, that is, an inner bellows 24 and an outer bellows 25 concentrically, and the bellows 24, 25 are attached to one end side in the axial direction by an annular mounting plate 26. On the other end side, it is supported by a movable flange portion 27 that is movable in the axial direction and forms an inner chamber 27 </ b> A as an air receiving space that is annular and opens radially inward. A sliding plate 28 is attached to the surface of the movable flange portion 27 facing the fixed flange portion 12 so that the two annular sliding members 12A provided on the flange portion 12 are in sliding contact with each other. The sliding plate 28 is preferably made of a relatively soft metal or the same material as the sliding member 12A. The sliding plate 28 may be formed by coating as a sliding layer. Here, “movable” of the movable flange means that the axial position is movable.

The mounting plate 26 and the movable flange portion 27 on one end side of the elastic cylindrical body assembly 23 have an inner diameter slightly larger than the outer diameter of the cylindrical end portion 11 of the first body 10, and the cylindrical end portion 11. A gap is formed between the outer surface and the non-contact surface. In the present embodiment, the radial gap δ ₁ between the mounting plate 26 and the cylindrical end portion 11 is slightly smaller than the radial gap δ ₀ between the cylindrical end portion 21 and the cylindrical end portion 11.

Further, an annular groove is formed on the inner peripheral surface of the right wall of the movable flange portion 27, and a ring 27B made of a low friction material similar to the sliding member 12A is mounted so as to protrude radially inward. has, in its inner peripheral edge forms the tubular portion 11 and the radial clearance [delta] _2. This gap δ ₂ is smaller than the gap δ ₁ .

  The elastic cylinder assembly 23 configured in this manner is attached to and supported by the mounting portion 22 by the mounting plate 26, and the movable flange portion 27 is in the radial direction due to the presence of the two bellows 24 and 25. It is also movable in the axial direction.

  The elastic cylinder assembly 23 forms an outer annular space 29 between the inner bellows 24 and the outer bellows 25 supported by the mounting plate 26 and the movable flange portion 27, and between the inner bellows 24 and the connecting portion 11. An inner annular space 30 is formed in the inner space.

  An air supply hole passes through the mounting portion 22 and the mounting plate 26 and communicates with the outer annular space 29, and a first air supply pipe 31 serving as an air supply means is connected to the first air supply pipe 31. A pressurized gas, such as pressurized nitrogen or pressurized air, is fed in. On the other hand, an air supply hole communicating with the inner chamber 27A is formed on the outer peripheral portion of the movable flange portion 27, and a second air supply pipe 32 serving as an air supply means is connected to the inner flange 27A to pressurize the inner chamber 27A. A gas, such as pressurized nitrogen, is fed in. The first air supply pipe 31 and the second air supply pipe 32 may have a common gas supply source or may be separate. Since a part of this gas flows into the second furnace 20 in the pressurized gas from the second air supply pipe 32, the gas that does not interfere with the heat treatment in the furnace depends on the type of the material to be heat treated. Selected.

  In such a heating device, sealing is performed between the two furnaces in the following manner.

  During the relative rotation operation of both the furnaces 10, 20, in this example, during the rotation of the first furnace 10, the first air supply pipe 31 provided in the non-rotating second furnace 20 and the first supply pipe 31 and the second The gas is fed into the outer annular space 29 and the inner annular space 30 through the two air supply pipes 32, respectively.

The pressurized gas in the outer annular space 29 presses the movable flange portion 27 of the second furnace 20 toward the fixed flange portion 12 of the first furnace 10 by its pressure. Even if both furnaces 10 and 20 are at a high temperature and are eccentric or slightly inclined due to thermal deformation or the like, the inner bellows 24 and the outer bellows 25 forming the outer annular space 29 are elastically deformed in the axial direction and the radial direction. By absorbing these, the movable flange portion 27 keeps a plane parallel to the fixed flange portion 12 and comes into contact with it. In addition, the contact pressure at that time is constant regardless of the deformation amount of the bellows 24 and 25 in the axial direction and the radial direction as long as the pressure of the pressurized gas is constant. When the relative displacement in the radial direction between the furnaces 10 and 20 due to thermal deformation or the like is larger than the gap δ ₂ , the cylindrical end portion 11 of the first furnace 10 has an outer peripheral surface of the elastic tubular assembly 23. Abutting on the ring 27B of the movable flange portion 27, the inner bellows 24 and the outer bellows 25 of the elastic cylindrical assembly 23 are deformed to absorb the displacement. Therefore, even during such displacement, since the gap δ ₁ is larger than the gap δ ₂ , the mounting plate 26 does not make metal contact with the outer peripheral surface of the cylindrical end portion 11.

  The pressurized gas fed into the inner chamber 27 </ b> A of the movable flange portion 27 flows in the axial direction through the inner annular space 30. On the other hand, the pressurized gas flows into the second furnace 20 and leaks the gas in the furnace from the second furnace 20. On the other hand, it flows out from a very small gap between the two sliding members 12A and the sliding plate 28 to prevent the entry of dust and the like from the outside. The sliding member 12A and the sliding plate 28 should theoretically be in close contact with each other due to the pressure from the outer annular space 29 and slidably rotate relative to each other with no gaps. Depending on the sheath flatness, it may actually slide while partially forming a minute space. However, even if such a gap exists partially, the outside is sealed by the pressurized gas flowing out of the gap. In addition, since the sliding surfaces are made of a low friction material, the frictional force is small, the frictional torque is reduced, and wear and heat generation are also suppressed. Furthermore, even if the periphery is heated from the inside of the furnace by the gas from the inner chamber 27A, it is cooled and the thermal deformation is small.

  In the present embodiment, the first furnace is rotated and the second furnace is non-rotating, and the elastic cylinder assembly is provided on the non-rotating second furnace and the air is supplied here. In the invention, it is also possible that the first furnace and the second furnace rotate together. In that case, it is necessary to provide means for supplying air to the elastic cylinder assembly while sealing while allowing rotation, and the mechanism becomes slightly complicated. It is therefore advisable to provide this means in the furnace with the lower rotational speed.

  In the present invention, the bellows is exemplified as the elastic cylinder. In short, it is sufficient if it is airtight and can be elastically deformed axially and radially. For example, a thin metal sheet may be simply a cylindrical body. Moreover, this thin sheet | seat can also be made into the shape similar to a bellows as a bellows form.

It is a fragmentary sectional front view showing one embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 (1st) Furnace 11 Cylindrical edge part 12 Fixed flange part 12A Sliding member 20 (2nd) Furnace 21 Cylindrical edge part 23 Sealing device (elastic cylinder assembly)
24 Inner elastic cylinder (inner bellows)
25 Outer elastic cylinder (outer bellows)
27 Movable flange portion 27A Inner chamber 28 Sliding plate 31 Air supply means (first air supply pipe)
32 Air supply means (second air supply pipe)

Claims (5)

  The cylindrical ends of the two furnaces that rotate relative to each other are concentrically connected to each other on a common axis so that the heat-treated material is transferred from one furnace to the other furnace. In the heating device provided with a sealing device that allows relative rotation between the end portions, the sealing device has a radially extending surface on the outer peripheral surface of the cylindrical end portion of one furnace. A fixed flange portion fixed to the outer peripheral surface and a cylindrical end portion of the other furnace movably in the axial direction so as to slide with the fixed flange portion or form a minute gap. The movable flange portion that faces the fixed flange portion, and the movable flange portion and the cylindrical end portion of the other furnace that supports the movable flange portion are extendable in the axial direction and flexible in the radial direction. Are connected by different inner and outer elastic cylinders and An inner annular space that communicates with the inside of the furnace of the other furnace is formed between the outer peripheral surface of the cylindrical end of one furnace, and an inner chamber that communicates with the gap is formed in the movable flange portion. In addition to air supply means for supplying pressurized gas to the chamber, other air supply means for supplying pressurized gas to the outer annular space formed between the inner elastic cylinder and the outer elastic cylinder are provided. A heating device characterized by that.   The heating device according to claim 1, wherein the inner elastic cylinder and the outer elastic cylinder are bellows.   2. The heating device according to claim 1, wherein at least one of the fixed flange portion and the movable flange portion has a sliding member or a sliding layer having low friction as compared to the flange base material on the facing portion.   The heating device according to claim 3, wherein the sliding member or the sliding layer has elasticity in the thickness direction. The heating apparatus according to claim 1, wherein one furnace rotates and the other furnace does not rotate.

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