A sealing structure between a cylindrical rotating body and a stationary structure, a rotary kiln equipped therewith, and a sealing method between a cylindrical rotating body and a stationary structure.

Abstract

The present invention provides a sealing structure between a cylindrical rotating body and a stationary structure, a rotary kiln equipped therewith, and a sealing method between a cylindrical rotating body and a stationary structure, which can seal the space between the cylindrical rotating body and the stationary structure even when there is a misalignment in the center positions of the cylindrical rotating body and the stationary structure. [Solution] The sealing structure 1 between the cylindrical rotating body and the stationary structure of the present invention is a sealing structure provided at the connection between the cylindrical rotating body 2 and the stationary structures 3 and 4, and is configured to use flexible sealing materials 5 and 6 and a pilot bearing 7 in combination, with the liquid lubricant of the pilot bearing 7 supplied to the sliding surface 8 of the cylindrical rotating body 2.

Description

Technical Field

[0001] The present invention relates to a sealing structure between a cylindrical rotating body and a stationary structure provided at a connection portion between the cylindrical rotating body and the stationary structure, a rotary kiln provided with the same, and a method for sealing between the cylindrical rotating body and the stationary structure.

Background Art

[0002] For example, as in the rotary kiln 20 shown in FIG. 2, when both ends of the cylindrical rotating body (retort) 2 are inserted and connected into the stationary structures 3 and 4 (feed chamber 3 or product receiving chamber 4) 3 and 4 respectively, a gap for the cylindrical rotating body (retort) 2 to rotate is required between the cylindrical rotating body (retort) 2 and the stationary structures 3 and 4 (feed chamber 3 or product receiving chamber 4). However, airflows and dust flows that circulate inside and outside the stationary structures 3 and 4 (feed chamber 3 or product receiving chamber 4) occur through this gap, causing various problems. For this reason, various devices called "sealing units" that fill the gap between the two have been devised and are widely used in the industrial field as component elements.

[0003] For example, in the sealing unit 50 shown in FIG. 8, the sealing material 51 that seals the gap between the cylindrical rotating body 2 and the stationary structure 3 is formed of a flexible material (such as synthetic resins like urethane, nylon, Teflon (registered trademark), etc.), and its circular inner diameter portion 52 is in a mechanism that contacts and slides on the cylindrical rotating body 2. Also, the axis of the cylindrical rotating body 2 and the center of the hole of the stationary structure 3 exactly coincide, and this coincidence of the centers depends on the accuracy of the equipment structure (such as a rotary kiln, turbine, Po pump, compressor, etc.) itself for attaching the sealing unit 50.

[0004] On the other hand, if the equipment is large and its structure is a combination of welded and machined parts, the error between the axis of the cylindrical rotating body 2 and the center of the hole in the stationary structure 3 may be displaced by several tens of millimeters due to thermal expansion, either due to the basic structure or the thermal effects of the intended use (for example, in a rotary kiln, the rotating body is heated to about 1000°C).

[0005] Specifically, using the rotary kiln as an example, as shown in Figure 9, the cylindrical rotating body (retort) 2 rotates on the wheels 22 placed on the common bed 21. During operation, heating causes the temperature of the cylindrical rotating body (retort) 2 and the tires 23 to rise, and due to thermal expansion, the shape changes from the left side of the figure to the right side, and the rotational core height j increases. This amount of change is the cylindrical rotating body (retort) 2 The displacement ranges from a few millimeters to several tens of millimeters, depending on the diameter, material (coefficient of thermal expansion), and temperature. For this reason, a donut-shaped seal material 51 cannot absorb this displacement, and a multi-stage lip seal 60 with poor sealing performance, as shown in Figure 10, is used.

[0006] This sealing material (multi-stage lip seal) 60 is made of a flexible material and consists of ring-shaped sheets with notches 61 in the inner diameter. Multiple ring-shaped sheets 60 are stacked with the notches 61 offset so that they do not overlap. The sealing performance of this method is such that it can withstand gases at several kPa (~0.1 kg / cm²). 2 It is about that level.

[0007] Incidentally, in the electronics industry, the features of rotary kilns (continuous production, precise temperature control, low maintenance, etc.) have recently been re-evaluated, and rotary kilns are beginning to be used, for example, in the operation of reducing oxidized metal compounds. The series of operations for reducing oxidized metal compounds are as follows. Note that, except for the seal structure 1, the rotary kiln 20 of the present invention and conventional rotary kilns have the same configuration, so we will explain using Figure 1. (1) The cylindrical rotating body (retort) 2 is rotated to heat up the inside of the heating furnace 24 and simultaneously evacuate it into a vacuum. (2) Hydrogen gas is supplied into the cylindrical rotating body (retort) 2 from the gas supply pipe 25. (3) Raw materials are supplied from the raw material inlet 26 through the double damper 27 for air lock. (4) The reaction begins inside the cylindrical rotating body (retort) 2 (reaction heat is generated, H2O is produced). (5) The heating of the furnace 24 is stopped, and the reduction is continued by the heat of the reaction. (6) The water vapor generated by the reaction is discharged from the exhaust duct 28. (7) The reduced product is discharged from the stationary structure (product receiving chamber) 4.

[0008] However, the required condition for the above operation is the reliability of the sealing function, that large gases such as hydrogen molecules that can fly freely be completely sealed, and that the vacuum pressure is 10 -2 Since it is required to be able to seal at the molecular level down to about Pa, the conventional sealing structures shown in Figures 8 and 10 were completely insufficient. In other words, simply pressing the cylindrical rotating body (retort) against the flexible sealing material 51 or sealing material 60 to seal it did not provide any sealing effect because, in addition to the misalignment and runout of the core positions of the cylindrical rotating body (retort) 2 and the stationary structures 3 and 4, there were microscopic elements (the tip surface of the flexible sealing material has irregularities of several tens of micrometers, and the surface of the cylindrical rotating body (retort) 2 in contact with it has processing marks (irregularities) of several micrometers. On the other hand, the size of gas molecules passing through these is less than 1 nm). [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2019-109010 [Overview of the project] [Problems that the invention aims to solve]

[0010] Therefore, the object of the present invention is to provide a sealing structure between a cylindrical rotating body and a stationary structure, a rotary kiln equipped therewith, and a sealing method between a cylindrical rotating body and a stationary structure, which can seal the space between the cylindrical rotating body and the stationary structure even when there is a misalignment in the center position of the cylindrical rotating body and the stationary structure. [Means for solving the problem]

[0011] The solution to the above problem is a seal structure provided at the connection between a cylindrical rotating body and a stationary system structure, wherein a flexible seal material and a pilot bearing are used in combination, and the liquid lubricant of the pilot bearing is supplied to the sliding surface of the cylindrical rotating body. The aforementioned stationary structure is supported via vibration-damping material. A sealing structure between a cylindrical rotating body and a stationary system structure, characterized by the above (Claim 1).

[0012] The vibration-damping material is preferably such that its spring constant curve exhibits a quadratic curve (Claim). 2 This is because minute (a few millimeters) runouts (such as those caused by thermal effects) in a cylindrical rotating body can be handled in the region of low spring constants, while maintaining the position and dimensions of a stationary structure can be handled in the region of high spring constants. Furthermore, a seal structure for a cylindrical rotating body and a stationary structure that solves the above problems is provided at the connection between the cylindrical rotating body and the stationary structure, wherein a flexible seal material and a pilot bearing are used in combination, the liquid lubricant of the pilot bearing is supplied to the sliding surface of the cylindrical rotating body, the flexible seal material has an O-ring and an X-ring, the O-ring is arranged on one side of the pilot bearing along the axial direction of the cylindrical rotating body, and the X-ring is arranged on the other side of the pilot bearing along the axial direction of the cylindrical rotating body (Claim 3). Furthermore, a seal structure for a cylindrical rotating body and a stationary structure that solves the above problems is provided at the connection between the cylindrical rotating body and the stationary structure, wherein a flexible seal material and a pilot bearing are used in combination, the liquid lubricant of the pilot bearing is supplied to the sliding surface of the cylindrical rotating body, and a cooling water jacket is provided on the outer circumference of the pilot bearing (Claim 4). .

[0013] Furthermore, a rotary kiln that solves the above problems is a rotary kiln equipped with a seal structure provided at the connection between a cylindrical rotating body, which is a retort, and a stationary structure, which is an input chamber and a product receiving chamber, wherein the seal structure uses a flexible seal material and a pilot bearing in combination, and the liquid lubricant of the pilot bearing is supplied to the sliding surface of the cylindrical rotating body. (Claim) 5 ).

[0014] Preferably, the stationary structure is supported via a vibration-damping material (Claim) 6 ). Preferably, the vibration-damping material has a spring constant curve that exhibits a quadratic curve (Claim). 7)。This is because the minute (several millimeters) deflection due to the thermal influence of the cylindrical rotating body is borne in the region with a low spring constant, and the dimensional retention as the stationary structure is borne in the region with a high spring constant. The flexible sealing material has an O-ring and an X-ring. It is preferable that the O-ring is arranged on one side of the pilot bearing along the axial direction of the cylindrical rotating body, and the X-ring is arranged on the other side of the pilot bearing along the axial direction of the cylindrical rotating body (Claim 8 )。It is preferable that a cooling water jacket is provided on the outer peripheral portion of the pilot bearing (Claim 9 )。

[0015] Furthermore, a sealing method for the connection portion between the cylindrical rotating body and the stationary structure that solves the above problems, in which a flexible sealing material and a pilot bearing are used in combination, and the liquid lubricant of the pilot bearing is supplied to the sliding surface of the cylindrical rotating body, The aforementioned stationary structure is supported via vibration-damping material. is a sealing method between the cylindrical rotating body and the stationary structure, characterized in that (Claim 1 0 )。

[0016] It is preferable that the vibration-proof material has a spring constant curve showing a quadratic curve (Claim 1 1 )。 Furthermore, a method for sealing the connection between a cylindrical rotating body and a stationary structure that solves the above problems is characterized in that a flexible sealing material and a pilot bearing are used in combination, the liquid lubricant of the pilot bearing is supplied to the sliding surface of the cylindrical rotating body, the flexible sealing material has an O-ring and an X-ring, the O-ring is arranged on one side of the pilot bearing along the axial direction of the cylindrical rotating body, and the X-ring is arranged on the other side of the pilot bearing along the axial direction of the cylindrical rotating body. is a sealing method between the cylindrical rotating body and the stationary structure (Claim 1 2 )。 Furthermore, a method for sealing the connection between a cylindrical rotating body and a stationary structure that solves the above problems is characterized by the use of a flexible sealing material and a pilot bearing in combination, the supply of liquid lubricant from the pilot bearing to the sliding surface of the cylindrical rotating body, and the provision of a cooling water jacket on the outer circumference of the pilot bearing. is a sealing method between the cylindrical rotating body and the stationary structure (Claim 1 3 )。

Advantages of the Invention

[0017] According to the sealing structure between the cylindrical rotating body and the stationary structure described in Claim 1, even when there is a deviation in the core positions of the cylindrical rotating body and the stationary structure, the deviation in the core positions of the cylindrical rotating body and the stationary structure is eliminated by the pilot bearing, and the liquid lubricant of the pilot bearing is supplied to the sliding surface of the cylindrical rotating body, so that airtightness is maintained and the sealing performance between the cylindrical rotating body and the stationary structure can be maintained. Furthermore, it can absorb displacement caused by rotational runout of the cylindrical rotating body, thereby more reliably maintaining sealing performance. Claim 2According to the sealing structure between the cylindrical rotating body and the stationary system structure described above, 1 In addition to the above effect, the vibration-damping material can absorb the misalignment of the core positions of the cylindrical rotating body and the stationary structure, while also providing fixed support for the stationary structure. Claim 3 According to the sealing structure between the cylindrical rotating body and the stationary system structure described above, 1 In addition to the above effects, the O-ring prevents the liquid lubricant of the pilot bearing from leaking out, and the X-ring allows the liquid lubricant of the pilot bearing to accumulate in its recess, making the sealing effect at the sliding surface with the cylindrical rotating body more reliable. Claim 4 According to the sealing structure between the cylindrical rotating body and the stationary system structure described above, 1 In addition to the above effect, the cooling water can cool the flexible seal material and pilot bearing, allowing the sealing performance to be maintained even when used in high-temperature environments. Claim 5 According to the rotary kiln equipped with the sealing structure between the cylindrical rotating body and the stationary structure described above, even if there is a misalignment in the center position between the cylindrical rotating body and the stationary structure, the pilot bearing eliminates the misalignment in the center position between the cylindrical rotating body and the stationary structure, and the liquid lubricant of the pilot bearing is supplied to the sliding surface of the cylindrical rotating body, thereby maintaining airtightness and preserving the sealing performance between the cylindrical rotating body and the stationary structure. Claim 6 According to the rotary kiln having a sealing structure between the cylindrical rotating body and the stationary system structure as described above, 5 In addition to the above effect, it can absorb displacement caused by rotational runout of the cylindrical rotating body, thereby more reliably maintaining sealing performance. Claim 7 According to the rotary kiln equipped with the sealing structure between the cylindrical rotating body and the stationary structure described above, in addition to the effects of claim 6, the vibration-damping material can absorb the misalignment of the core positions of the cylindrical rotating body and the stationary structure, and can also fix and hold the stationary structure. Claim 8According to the rotary kiln having a sealing structure between the cylindrical rotating body and the stationary system structure as described above, 5 or 6 In addition to the above effects, the O-ring prevents the liquid lubricant of the pilot bearing from leaking out, and the X-ring allows the liquid lubricant of the pilot bearing to accumulate in its recess, making the sealing effect at the sliding surface with the cylindrical rotating body more reliable. Claim 9 According to the rotary kiln having a sealing structure between the cylindrical rotating body and the stationary system structure as described above, 5 or 6 In addition to the above effects, the cooling water can also be used to cool the flexible seal material and pilot bearing. 、 It can maintain its sealing performance even when used in high-temperature environments. Claim 1 0 According to the sealing method between the cylindrical rotating body and the stationary structure described above, even if there is a misalignment in the center position of the cylindrical rotating body and the stationary structure, the pilot bearing eliminates the misalignment in the center position of the cylindrical rotating body and the stationary structure, and the liquid lubricant of the pilot bearing is supplied to the sliding surface of the cylindrical rotating body, thereby maintaining airtightness and preserving the sealing performance between the cylindrical rotating body and the stationary structure. Furthermore, it can absorb displacement caused by rotational runout of the cylindrical rotating body, thereby more reliably maintaining sealing performance. Claim 1 1 According to the sealing method between the cylindrical rotating body and the stationary structure described above, claim 1 0 In addition to the above effect, the vibration-damping material can absorb the misalignment of the core positions of the cylindrical rotating body and the stationary structure, while also providing fixed support for the stationary structure. Claim 1 2 According to the sealing method between the cylindrical rotating body and the stationary structure described above, claim 1 0 In addition to the above effects, the O-ring prevents the liquid lubricant of the pilot bearing from leaking out, and the X-ring allows the liquid lubricant of the pilot bearing to accumulate in its recess, making the sealing effect at the sliding surface with the cylindrical rotating body more reliable. Claim 1 3 According to the sealing method between the cylindrical rotating body and the stationary structure described above, claim 1 0In addition to the above effects, the cooling water can cool the flexible seal material and pilot bearing, allowing the sealing performance to be maintained even when used in high-temperature environments. [Brief explanation of the drawing]

[0018] [Figure 1] This is a perspective view of one embodiment of the rotary kiln of the present invention. [Figure 2] Figure 1 is a longitudinal cross-sectional view of the rotary kiln. [Figure 3] Figure 1 is a partially enlarged longitudinal cross-sectional view illustrating the sealing structure between the cylindrical rotating body and the stationary system structure in the rotary kiln shown. [Figure 4] Figure 3 is a magnified perspective cross-sectional view illustrating the flexible sealing material (X-ring) used in the sealing structure of the cylindrical rotating body shown. [Figure 5] Figure 1 is an explanatory diagram illustrating the vibration isolation structure of the rotary kiln, where (a) is a front view and (b) is a partial side view. [Figure 6] Figure 5 is a perspective view enlargement of one embodiment of the vibration-damping rubber used in the vibration-damping structure shown. [Figure 7] Figure 6 is a graph showing the characteristics (spring constant) of the vibration-damping rubber used. [Figure 8] This is a partially enlarged longitudinal cross-sectional view illustrating the sealing structure between the cylindrical rotating body and the stationary system in a conventional rotary kiln. [Figure 9] Figure 2 is a cross-sectional view along the CC line, and is an explanatory diagram for illustrating the displacement of the rotational core height j due to heat in a rotary kiln. [Figure 10] This is a front view enlargement illustrating the sealing material used in conventional sealing structures between cylindrical rotating bodies and stationary structures. [Modes for carrying out the invention]

[0019] In this invention, flexible sealing materials 5 and 6 and a pilot bearing 7 are used in combination, and the liquid lubricant of the pilot bearing 7 is supplied to the sliding surface 8 of the cylindrical rotating body 2. This configuration enables sealing between the cylindrical rotating body 2 and the stationary structures 3 and 4 even when there is a misalignment in the core positions of the cylindrical rotating body 2 and the stationary structures 3 and 4. This provides a sealing structure 1 between a cylindrical rotating body and a stationary structure, a rotary kiln 20 equipped therewith, and a sealing method between a cylindrical rotating body and a stationary structure. [Examples]

[0020] The sealing structure between the cylindrical rotating body and the stationary structure of the present invention, and a rotary kiln equipped therewith, will be explained using an embodiment of a rotary kiln to which the sealing structure 1 between the cylindrical rotating body 2 and the stationary structures 3 and 4 shown in Figures 1 to 7 is applied.

[0021] The rotary kiln 20 in this embodiment is a rotary kiln equipped with a seal structure 1 provided at the connection point between the cylindrical rotating body 2, which is the retort 2, and the stationary system structures 3 and 4, which are the input chamber 3 and the product receiving chamber 4. As shown in Figure 3, the seal structure 1 uses flexible sealing materials 5 and 6 and a pilot bearing 7 in combination, and the liquid lubricant g of the pilot bearing 7 is supplied to the sliding surface 8 of the cylindrical rotating body (retort) 2. Each of these components will be described in detail below.

[0022] As shown in Figure 1 or 2, the rotary kiln 20 of this embodiment has a stationary structure (input chamber) 3 with a raw material inlet 26 on one end of the cylindrical rotating body (retort) 2, and a stationary structure (product receiving chamber) 4 with a product discharge port 32 on the other end of the cylindrical rotating body (retort) 2. The chutes, ducts, and piping connected to the stationary structure (input chamber) 3 and the stationary structure (product receiving chamber) 4 are all connected by bellows, flexible joints, etc.

[0023] The cylindrical rotating body (retort) 2 is mounted so as to be rotatable about its axis by a retort drive motor 30 and a sprocket 31, and is also mounted so as to be rotatable on the road wheels 22 via tires 23, with the majority of the cylindrical rotating body (retort) 2's own weight being loaded onto the road wheels 22.

[0024] As shown in Figure 2, the cylindrical rotating body (retort) 2 is positioned such that one end (raw material inlet 3 side) is θ° higher than the other end (product outlet 32 ​​side).

[0025] The cylindrical rotating body (retort) 2 is positioned to pass through a heating furnace 24 that is heated by an electric heating element 29, and is supported by wheels 22 provided on a common bed 21. It is configured to roll on the wheels 22 via tires 23 as it is rotated by a retort drive motor 30 and a sprocket 31.

[0026] Then, when the raw material (object to be processed) is introduced from the raw material inlet 26, the raw material (object to be processed) is supplied into the cylindrical rotating body (retort) 2 and slowly moves to the right in Figure 2 due to the rotation and gradient (θ°) of the cylindrical rotating body (retort) 2. Since the cylindrical rotating body (retort) 2 is heated to a high temperature by the electric heating element 29 of the heating furnace 24, the raw material (object to be processed) inside the cylindrical rotating body (retort) 2 is fired by heat transfer from the cylindrical rotating body (retort) 2. The fired product is configured to be discharged to the outside through the product discharge port 32 located at the right end.

[0027] A feature of the rotary kiln 20 of the present invention is the cylindrical rotating body ( Reto This is a sealing structure 1 between the belt 2 and the stationary system structures 3 and 4, and its structure and operation will be described. As shown in Figure 1 or Figure 2, the rotary kiln 20 has a seal structure 1 at two connection points (the connection point between the cylindrical rotating body (retort) 2 and the stationary structure (input chamber) 3, and the connection point between the cylindrical rotating body (retort) 2 and the stationary structure (product receiving chamber) 4). Figure 3 shows the seal structure 1 between the cylindrical rotating body (retort) 2 and the stationary structure (product receiving chamber) 4. The seal structure 1 between the cylindrical rotating body (retort) 2 and the stationary structure (input chamber) 3 is similar.

[0028] The sealing structure 1 between the cylindrical rotating body (retort) 2 and the stationary structure (input chamber 3, product receiving chamber 4) is capable of sealing the gap between the stationary structure (product receiving chamber) 4, which cannot be subjected to thermal expansion or precise structural accuracy, and the cylindrical rotating body (retort) 2 that fits into it.

[0029] As shown in Figure 3, the seal structure 1 between the cylindrical rotating body (retort) 2 and the stationary system structure (input chamber 3, product receiving chamber 4) uses a combination of flexible sealing materials 5 and 6 and a pilot bearing 7.

[0030] The pilot bearing 7 is positioned to eliminate misalignment between the stationary structures (input chamber 3, product receiving chamber 4) and the cylindrical rotating bodies (retorts) 2 that are fitted into them, respectively. In this embodiment, the pilot bearing 7 is a ball bearing, but it is not limited to this, and other bearings such as needle bearings or cross roller bearings may also be used.

[0031] The flexible sealing material in this embodiment has an O-ring 5 and an X-ring 6. The O-ring 5 is positioned on one side of the pilot bearing 7 along the axial direction of the cylindrical rotating body (retort) 2, and the X-ring 6 is positioned on the other side of the pilot bearing 7 along the axial direction of the cylindrical rotating body (retort) 2. In this way, the flexible sealing material (O-ring 5 and X-ring 6) and the pilot bearing 7 are provided parallel to the same axis of rotation (cylindrical rotating body (retort) 2) and used together to maintain the rotational concentricity accuracy required for sealing. The flexible sealing material (O-ring 5 and X-ring 6) in this embodiment is made of a flexible material (such as urethane, nylon, or synthetic resins such as Teflon®).

[0032] Furthermore, the liquid lubricant (e.g., grease) g of the pilot bearing 7 is supplied to the sliding surface 8 of the cylindrical rotating body 2, and is configured to be supplied through the same system. This ensures that airtightness is maintained and a reliable seal is achieved between the cylindrical rotating body (retort) 2 and the stationary structure (input chamber 3, product receiving chamber 4).

[0033] Specifically, the O-ring 5 in this embodiment is for preventing the liquid lubricant g of the pilot bearing 7 from leaking to the outside, and the X-ring 6 has a recess 6a (see Figure 4) into which the liquid lubricant g of the pilot bearing is contained. but This is to ensure a more reliable sealing effect at the sliding surface 8 with the cylindrical rotating body (retort) 2. Liquid lubricant g used in pilot bearings accumulates in the recess 6a of this X-ring 6, forming a liquid film. leather The membrane is designed to completely block the passage of gas molecules and ultrafine particles, thereby enhancing the effect of atmospheric isolation. leather In order to maintain a good seal state with the membrane, concentricity is required between the cylindrical rotating body (retort) 2 and the stationary structure (input chamber 3, product receiving chamber 4), but the flexible sealing material 5, 6 and liquid leather The precise clearance of the membrane-based sliding seal is ensured by the pilot bearing 7.

[0034] In this invention, the "X-ring" refers to an annular body with an X-shaped cross-section, as shown in Figure 4, which is molded from a flexible material such as synthetic rubber, silicone resin, or fluororesin. Furthermore, the cylindrical rotating body in this embodiment ( Reto In the seal structure 1 between the bolt 2 and the stationary system structures 3 and 4, an O-ring 5 is placed on one side of the pilot bearing 7 and an X-ring 6 is placed on the other side of the pilot bearing 7. However, the invention is not limited to this, and structures in which X-rings 6 are placed on both sides of the pilot bearing 7, or in which O-rings 5 ​​are placed on both sides of the pilot bearing 7, are also included within the scope of the present invention.

[0035] At least one of the stationary structures (input chamber 3 or product receiving chamber 4) is supported via a vibration-damping material (vibration-damping rubber) 9. This configuration allows for the absorption of displacement caused by rotational runout of the cylindrical rotating body (retort) 2, thereby more reliably maintaining sealing performance.

[0036] Specifically, forcibly pushing the pilot bearing 7 into a location where the rotation axis is misaligned would place excessive stress on the pilot bearing 7 and could cause serious failure. Therefore, in this embodiment, a vibration-damping material (vibration-damping rubber) 9 is provided at the support portion of the stationary structure (input chamber 3), and all deviations caused by rotational runout generated from the cylindrical rotating body (retort) 2 are absorbed by this vibration-damping material (vibration-damping rubber) 9, thereby ensuring more reliable sealing performance.

[0037] This vibration-damping material (vibration-damping rubber) 9 has the same characteristics as those used in seismic isolation systems for buildings (its spring constant is extremely high under vertical load and about 1 / 8 to 1 / 10 of that in the horizontal direction), allowing it to follow rotational vibrations smoothly and maintain structural rigidity within a practical range. The eccentric vibrations experienced by the pilot bearing 7 cause the stationary structure (input chamber 3, product receiving chamber 4) to shake, and the vibration-damping material (vibration-damping rubber) 9 absorbs this shaking to support the stationary structure (input chamber 3, product receiving chamber 4).

[0038] More specifically, the vibration-damping material (vibration-damping rubber) 9 in this embodiment is provided on the side of the stationary system structure (input chamber 3), as shown in Figure 1 or Figure 5, on the common bed 2 1 A vibration-damping material (vibration-damping rubber) 9 is placed on top of a vibration-damping material frame 33 erected on the ground, and the stationary structure (input chamber 3) is supported by it.

[0039] The vibration-damping material 9 in this embodiment is made of vibration-damping rubber as shown in Figure 6. A bolt (not shown) is inserted through the bolt insertion hole 9a and fixed to the vibration-damping material frame 33 and the stationary structure (input chamber 3) with a washer and nut (not shown).

[0040] The vibration-damping material (vibration-damping rubber) 9 preferably has a spring constant curve that exhibits a quadratic curve, as shown in Figure 7. By using such vibration-damping rubber, the vibration-damping material 9 can absorb the misalignment of the core positions of the cylindrical rotating body (retort) 2 and the stationary structures 3 and 4, and can also fix and hold the stationary structures 3 and 4 in place.

[0041] More specifically, in the case of a metal spring, the displacement in response to the applied load is almost linear (the load and displacement are proportional), but the vibration-damping rubber 9 has a characteristic slope that is somewhat closer to a quadratic curve. That is, as shown in the graph in Figure 7, the resistance load of the vibration-damping rubber 9 itself is small when the displacement is small, and the resistance load increases when the displacement increases (when the weight of the stationary structures 3 and 4 or external forces are applied). Therefore, range A acts as an absorption region for the purpose of maintaining the sealing function, absorbing the shift in the core position, and range B acts to fix and hold the stationary structures 3 and 4 in place.

[0042] Furthermore, as shown in Figure 3, a cooling water jacket 10 is provided on the outer circumference of the pilot bearing 7. Therefore, when cooling water w is supplied to the cooling water jacket 10, the flexible sealing material 5 , 6This allows for cooling of the pilot bearing 7, maintaining sealing performance even in high-temperature environments, and making it applicable as a sealing structure for equipment operated in high-temperature environments, such as the rotary kiln 20 in this embodiment.

[0043] The rotary kiln 20 equipped with the seal structure 1 between the cylindrical rotating body and the stationary structure of the present invention has the above-described seal structure 1 and can therefore exhibit sufficient sealing function and be used even for the aforementioned operation of reducing oxidized metal compounds. Although the seal structure 1 between the cylindrical rotating body 2 and the stationary structure 3,4 described above is an example applied to a rotary kiln, the seal structure between the cylindrical rotating body and the stationary structure of the present invention is not limited to this and broadly encompasses seal structures provided at the connection between the cylindrical rotating body and the stationary structure, for example, in turbines. Po Applications to pumps, compressors, and the like, as well as devices to which these are applied, are also included within the scope of the present invention.

[0044] Furthermore, the sealing method between the cylindrical rotating body and the stationary structure of the present invention will be explained using an embodiment of a rotary kiln to which the sealing method between the cylindrical rotating body 2 and the stationary structures 3 and 4 shown in Figures 1 to 7 is applied.

[0045] The sealing method between the cylindrical rotating body 2 and the stationary structures 3 and 4 in this embodiment is a sealing method at the connection portion between the cylindrical rotating body 2 and the stationary structures 3 and 4, characterized in that a flexible sealing material 5 and 6 and a pilot bearing 7 are used in combination, and the liquid lubricant g of the pilot bearing 7 is supplied to the sliding surface 8 with the cylindrical rotating body 2.

[0046] Preferably, at least one of the stationary structures 3 and 4 is supported via a vibration-damping material 9. Preferably, the vibration-damping material 9 has a spring constant curve that exhibits a quadratic curve. The flexible sealing material has an O-ring 5 and an X-ring 6, wherein the O-ring 5 is arranged on one side of the pilot bearing 7 along the axial direction of the cylindrical rotating body 2, and the X-ring 6 is arranged on the other side of the pilot bearing 7 along the axial direction of the cylindrical rotating body 2. Preferably, a cooling water jacket 10 is provided on the outer circumference of the pilot bearing 7. These configurations are the same as those described above for the sealing structure 1 between the cylindrical rotating body 2 and the stationary structures 3 and 4 and the rotary kiln 20 equipped therewith, and the same reference numerals are used for the same components and detailed descriptions are omitted. [Explanation of Symbols]

[0047] 1. Seal structure between a cylindrical rotating body and a stationary system structure 2. Cylindrical rotating body (retort) 3. Static System Structure (Input Chamber) 4. Static System Structure (Product Receiving Chamber) 5. Flexible sealing material (O-ring) 6. Flexible sealing material (X-ring) 7 Pilot bearing 8. Sliding surface with cylindrical rotating body (retort) 9 Vibration isolation material 10 Cooling water jacket 20 Rotary Kilns 21 Common Beds 22 road wheels 23 tires 24 Furnace 25 Gas supply pipe 26 Raw material input port 27. Double damper for air lock 28 Exhaust duct 29 Electric heating element 30 Retort drive motor 31 sprocket 32 Product outlet 33 Vibration Isolator Mounting Frame j Center height g Liquid lubricant w Cooling water

Claims

1. A seal structure provided at the connection between a cylindrical rotating body and a stationary structure, characterized in that a flexible seal material and a pilot bearing are used in combination, and the liquid lubricant of the pilot bearing is supplied to the sliding surface of the cylindrical rotating body.

2. The sealing structure between a cylindrical rotating body and a stationary structure according to claim 1, wherein the stationary structure is supported via a vibration-damping material.

3. The sealing structure between a cylindrical rotating body and a stationary system structure according to claim 2, wherein the vibration-damping material exhibits a spring constant curve that is quadratic.

4. The sealing structure between a cylindrical rotating body and a stationary system structure according to claim 1 or 2, wherein the flexible sealing material has an O-ring and an X-ring, the O-ring is disposed on one side of the pilot bearing along the axial direction of the cylindrical rotating body, and the X-ring is disposed on the other side of the pilot bearing along the axial direction of the cylindrical rotating body.

5. The sealing structure between a cylindrical rotating body and a stationary system structure according to claim 1 or 2, wherein a cooling water jacket is provided on the outer circumference of the pilot bearing.

6. A rotary kiln having a seal structure provided at the connection between a cylindrical rotating body, which is a retort, and a stationary structure consisting of an input chamber and a product receiving chamber, wherein the seal structure uses a flexible seal material and a pilot bearing in combination, and the liquid lubricant of the pilot bearing is supplied to the sliding surface of the cylindrical rotating body.

7. A rotary kiln having a sealing structure between a cylindrical rotating body and a stationary structure according to claim 6, wherein at least one of the input chamber or product receiving chamber, which is the stationary structure, is supported via a vibration-damping material.

8. The rotary kiln comprising a sealing structure between a cylindrical rotating body and a stationary system structure according to claim 7, wherein the vibration-damping material exhibits a spring constant curve that is quadratic.

9. A rotary kiln having a sealing structure between a cylindrical rotating body and a stationary structure according to claim 6 or 7, wherein the flexible sealing material has an O-ring and an X-ring, the O-ring is disposed on one side of the pilot bearing along the axial direction of the cylindrical rotating body, and the X-ring is disposed on the other side of the pilot bearing along the axial direction of the cylindrical rotating body.

10. A rotary kiln having a sealing structure between a cylindrical rotating body and a stationary system structure, as described in claim 6 or 7, wherein a cooling water jacket is provided on the outer circumference of the pilot bearing.

11. A sealing method for the connection between a cylindrical rotating body and a stationary structure, characterized in that a flexible sealing material and a pilot bearing are used in combination, and the liquid lubricant of the pilot bearing is supplied to the sliding surface of the cylindrical rotating body.

12. The sealing method between a cylindrical rotating body and a stationary structure according to claim 11, wherein the stationary structure is supported via a vibration-damping material.

13. The rotary kiln comprising a sealing structure between a cylindrical rotating body and a stationary system structure according to claim 12, wherein the vibration-damping material exhibits a spring constant curve that is quadratic.

14. The method for sealing a cylindrical rotating body and a stationary structure according to claim 11 or 12, wherein the flexible sealing material has an O-ring and an X-ring, the O-ring is disposed on one side of the pilot bearing along the axial direction of the cylindrical rotating body, and the X-ring is disposed on the other side of the pilot bearing along the axial direction of the cylindrical rotating body.

15. A sealing method between a cylindrical rotating body and a stationary system structure according to claim 11 or 12, wherein a cooling water jacket is provided on the outer circumference of the pilot bearing.

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