JP2011058531A - Seal structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve good sealing of a clearance between a spindle in a furnace of a type, such as a roller hearth furnace, heating heated objects while carrying them with a plurality of rollers installed in the furnace and a through-hole of a furnace wall and through-holes of the buildings of a bearing housing, or a clearance between a pipe extended between two buildings and exposed therefrom and a through-hole with simple installation work, while insulating the spindle or the pipe. <P>SOLUTION: Heat insulating material made by bonding inorganic fiber and metallic foil and having flanges on both ends in a width direction is wound around the spindle or the pipe so that the inorganic fiber is on an outer peripheral face side of the spindle or pipe, fluororesin sheet material having flanges on both sides in a width direction is put on the heat insulating material, and overlapped parts of the flanges of the heat insulating material and the flanges of the sheet material are fastened to fixing flanges disposed to structures. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sealing structure for sealing a gap between a tubular member such as a high-temperature support shaft or piping projecting from a structure and a through-hole opened in the structure for projecting the tubular member. .

  FIG. 10 is a cross-sectional view showing an example of a roller hearth furnace 1, and a plurality of rollers 3 are arranged in the longitudinal direction of the furnace 1 in the introduction portion and the outlet 1 b leading to the inlet 1 a of the furnace 1 and in the furnace 2. The heated object 10 such as a metal plate is heated while being conveyed by the roller 3.

  Heating is performed in various gas atmospheres according to the purpose. For example, in a heat-retaining furnace used in a steel sheet rolling process, LPG or natural gas combustion exhaust gas is supplied to the furnace 2 and heated. . In addition, firing of electronic ceramics such as a ceramic capacitor and soft ferrite is performed in the furnace 2 in an inert atmosphere such as nitrogen gas.

  Therefore, for example, an introduction space is provided at the front stage of the inlet 1a of the furnace 1 and a carry-out space is provided at the rear stage of the outlet 1b so that a double door configuration is taken, and measures are taken to prevent outside air from flowing into the furnace 2. However, as shown in FIG. 11 (AA cross-sectional view in FIG. 10), the roller 3 protrudes out of the furnace shaft 3a from the furnace and is rotatably supported by the bearing 4. There is a gap G with the wall, and outside air flows into the furnace 2 through this gap G.

  In order to seal the gap G, for example, in Patent Document 1, a gas sealing mechanism 20 is provided between the support shaft 3a of the roller 3 and the bearing 4 as shown in FIG. In the gas sealing mechanism 20, the support shaft 3 a is supported by the bearing 4 via a roller support folder 21, and has a sealing structure with an oil seal 22 interposed between the roller support folder 21. The casing 1d of the side wall 1c of the furnace 1 is provided with a cylindrical projection 23 so as to surround a through hole for penetrating the support shaft 3a, and a rubber sleeve 24 is covered at the tip of the cylindrical projection 23. It is fitted. An oil seal 22 is provided inside the outer end of the rubber sleeve 24, and the roller support folder 21 is inserted into the oil seal 22 in an airtight state.

  However, for example, in a heat-retaining furnace used in the rolling process, the temperature in the furnace 2 becomes close to 300 ° C., so that the roller 3 also has an equivalent high temperature and is transferred to the roller support folder 21 via the support shaft 3a. The rubber sleeve 24 is heated by the heat radiation from the roller support folder 21. Moreover, since the cylindrical protrusion 23 is also heated by heat radiation from the high temperature support shaft 3a, the joint portion of the rubber sleeve 24 with the cylindrical protrusion 23 also becomes high temperature. Even the fluorine-based rubber having the highest heat resistance is deteriorated in rubber properties before reaching 200 ° C. Therefore, in such a gas sealing device 20, it is conceivable that the sealing performance by the rubber sleeve 24 is lowered relatively early.

  Moreover, as shown in FIG. 13, in a factory, a nuclear reactor facility, etc., it is often piped across two buildings 65 and 66. As shown in Patent Document 2, normally, the pipe 70 is inserted into the through holes provided in the walls 65a and 66a of both buildings, and the gap between the through hole and the pipe 70 is filled with a filler 80 such as mortar. Has been done. And when circulating the heated fluid to the piping 70, the heat insulating material 90 is mounted | worn in the part exposed from the buildings 65 and 66 of the piping 70. As shown in FIG.

  Therefore, two operations of filling and heat insulation for filling the gap are necessary, and a large filling device such as a pump and a hose for filling the filler 80 is required. Further, when mortar is used as the filler 80, it takes time until the mortar is cured.

JP-A-6-3057 JP 2009-1114850 A

  Therefore, the present invention provides a support shaft for a heating furnace that heats an object to be heated with a plurality of rollers installed in the furnace, such as a roller hearth furnace, a through hole in the furnace wall, and a bearing housing. Seals the gap between the through-hole and the pipe that is exposed across the two buildings and the through-hole of the building with good insulation while insulating the support shaft and the pipe, even though it is a simple mounting operation. For the purpose.

In order to achieve the above object, the present invention provides the following seal structure.
(1) A seal structure for sealing a gap between a high temperature tubular member exposed across two structures and a through hole of both structures,
While winding the main body part of the heat insulating material formed by attaching flanges to both ends in the width direction of the band-shaped main body part, the ends of the main body part are connected to each other,
On the heat insulating material, while wrapping a sheet material formed by attaching flanges to both ends in the width direction of the belt-shaped main body part, and connecting the end parts of the main body part of the sheet material,
One of the overlapping portions of the flange of the heat insulating material and the flange of the sheet material is fixed to a fixing flange provided surrounding the through hole of one structure, and the other overlapping portion is fixed to the through hole of the other structure. A sealing structure characterized by being fixed to a fixing flange provided so as to surround or to a fixing flange provided to a tubular member.
(4) The above-mentioned (1) to (3), wherein the end portions of the main body portion of the heat insulating material and the end portions of the main body portion of the sheet material are connected by a hook-and-loop fastener provided in each overlapping portion. The seal structure according to any one of the above.
(5) The seal structure according to (4), wherein the portions of the sheet material connected by the hook-and-loop fastener are sealed with a silicone sealant.
(6) The above-mentioned (1), wherein the heat insulating material and the sheet material can be removed by screwing the overlapping portion of the flange of the heat insulating material and the flange of the sheet material and fixing the fixing flange. The seal structure according to any one of (5) to (5).

  In the seal structure of the present invention, since the outermost surface is a sheet material, outside air does not enter. In addition, since the heat insulating material is in contact with the outer peripheral surface of the support shaft and piping, the heat from the high temperature support shaft and piping is insulated by the heat insulating material, and the sheet material is not thermally deteriorated. Can be maintained.

  In addition, when applied to a roller hearth furnace, both the heat insulating material and the sheet material have flexibility, so that they can be easily deformed even if the support shaft swings with the rotation of the roller. There will be no hindrance.

  Furthermore, heat insulation material and sheet material are overlapped on site, and the overlapped part of the main body is connected and fixed with a hook-and-loop fastener, and the flange is fixed by bolting to a fixing flange provided on the outer wall of the furnace wall or building. Since it only needs to be fixed, the construction of the seal structure is simple and the maintenance work is extremely easy.

It is a perspective view which shows the heat insulating material used for the seal structure of this invention. It is sectional drawing for demonstrating the flange attachment method of a heat insulating material. It is a perspective view which shows the sheet | seat material used for the seal structure of this invention. It is sectional drawing for demonstrating the flange attachment method of a sheet | seat material. It is a figure which shows the example which applied the seal structure of this invention to the roller hearth furnace, and is a half sectional view which shows the furnace side. It is a figure which shows the example which applied the seal structure of this invention to the roller hearth furnace, and is a half sectional view which shows the bearing housing side. It is sectional drawing which shows the example which applied the seal structure of this invention to piping between buildings. It is sectional drawing which shows the other example which applied the seal structure of this invention to piping between buildings. It is the schematic of the test apparatus used for the leak test. It is sectional drawing which shows an example of a roller hearth furnace. It is AA sectional drawing of FIG. It is sectional drawing which shows the sealing structure of the conventional roller hearth furnace. It is sectional drawing which shows the sealing structure of piping between the conventional buildings.

  Hereinafter, the seal structure of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a heat insulating material 1 used in the seal configuration of the present invention. The heat insulating material 1 is preferably the one in which the inorganic fiber woven fabric 10 and the metal foil 11 are joined. However, when the furnace temperature is lower than 250 ° C., only the inorganic fiber woven fabric 10 may be used. Further, the heat insulating material 1 is provided with flanges 12 at both ends in the width direction of the band-shaped main body 13. The inorganic fiber woven fabric 10 is a woven fabric made of ceramic fiber, glass fiber, or the like, but a glass fiber woven fabric is preferable in consideration of flexibility and cost. Examples of the metal foil 11 include aluminum foil and stainless steel foil. Aluminum foil is preferable because it is easily available from the market and inexpensive. Moreover, as a joining method of the inorganic fiber woven fabric 10 and the metal foil 11, it is preferable to heat-seal | fusing using a heat-seal | fusing film, since it can join uniformly planarly and is excellent in productivity. The flange 12 is made of, for example, a glass woven fabric impregnated with rubber, and bolt through holes 12a for bolt fastening are opened at equal intervals.

  The main body 13 insulates the heat from the support shaft, and as long as it is kept below the heat resistant temperature (about 260 ° C.) of the fluororesin or fluororubber forming the sheet material (see FIG. 3) wound thereon, 1 A sheet of thick inorganic fiber woven fabric 10 joined to metal foil 11 may be used, or a laminate of thin inorganic fiber woven fabric 10 and metal foil 11 may be laminated. However, the thicker the inorganic fiber woven fabric 10 becomes, the more expensive it becomes, and the number of the metal foils 11 increases and the heat transfer to the sheet material is blocked. It is preferable to laminate. However, as the number of layers increases, the workability of winding on the support shaft deteriorates. Therefore, it is particularly preferable to laminate the bonded product of the inorganic fiber woven fabric 10 and the metal foil 11 having an appropriate thickness in two layers.

  In addition, as shown in FIG. 2, the flange 12 is attached to the main body 13 by laminating two layers of the joined product of the inorganic fiber woven fabric 10 and the metal foil 11 and bending both ends in the width direction into a substantially L shape. Then, the flange 12 is clamped, and, for example, as shown by reference numeral 15, it is sewn at an appropriate position of the bent portion and the root portion of the bent portion. Also from the attachment structure of such a main-body part 13 and the flange 12, it is preferable to laminate | stack the joined material of the inorganic fiber woven fabric 10 and the metal foil 11 in two layers.

  The heat insulating material 1 is wound around the support shaft so that the inorganic fiber woven fabric 10 of the main body 13 is on the outer peripheral surface side of the support shaft. In order to maintain this winding state, it is possible to tape the overlapping part of the main body part 13 or to wrap the belt around the entire circumference of the main body part 13. Fixing with the pair of upper and lower hook-and-loop fasteners 14a and 14b makes it easier to attach and remove the heat insulating material 1 in addition to the retainability of the wound state. That is, the lower surface fastener 14a is attached over substantially the entire width of the metal foil 11 at one end portion in the longitudinal direction of the main body 13, and the upper surface fastener 14b is disposed over the substantially entire width of the inorganic fiber woven fabric 10 at the other end portion. Install. And the winding state can be maintained by overlapping the edge part of the inorganic fiber woven fabric 10 on the edge part of the metal foil 11, and fixing surface fastener 14a, 14b. Moreover, when removing the heat insulating material 1, it is only necessary to grasp the end of the overlapping portion and peel the upper hook-and-loop fastener 14a from the lower hook-and-loop fastener 14b.

  The hook-and-loop fasteners 14a and 14b are formed of a heat-resistant resin such as an amide resin or an aramid resin in order to suppress deformation and deterioration due to heat from the support shaft. It is preferable to form a loop part and a hook part, and it is attached to the main body part 13 by sewing. Further, in order to improve heat resistance, a glass fiber mat may be interposed.

  FIG. 3 is a perspective view showing the sheet material 2 used in the seal structure of the present invention. Since the sheet material 2 is excellent in heat resistance and has no air permeability, a sheet made of fluororesin or fluororubber is processed into a strip shape, and the body portion 21 is also made of fluororesin or fluororubber at both ends in the width direction. The flange 22 is provided. Bolt through holes 22a for bolt fastening are opened at equal intervals in the flange 22, and the end of the main body 21 is bent into an L shape as shown in FIG. 4, for example, as shown by reference numeral 25. It is attached by sewing at the right place of the part.

  Further, a lower surface fastener 23a is attached to the surface of one end portion in the longitudinal direction of the main body 21 over substantially the entire width, and an upper surface fastener 23b over the substantially entire width is attached to the back surface of the other end portion. Is attached. The surface fasteners 23 a and 23 b are the same as the surface fasteners 14 a and 14 b of the heat insulating material 1. And like the heat insulating material 1, the end state of the main-body part 21 is piled up and the surface fasteners 23a and 23b are fixed, The winding state of the sheet | seat material 2 can be maintained, and removal is also easy.

  5 and 6 show examples in which the seal structure of the present invention is applied to a roller hearth furnace. FIG. 5 shows the furnace side, and FIG. 6 shows the bearing housing side. In order to construct the seal structure, first, the main body 13 of the heat insulating material 1 is wound around the support shaft 3a so that the inorganic fiber woven fabric 10 is on the outer peripheral surface side of the support shaft 3a, and the overlapping portions at both ends in the longitudinal direction are faced. Fix with fasteners 14a and 14b. Next, the sheet material 2 is overlapped and wound on the heat insulating material 1, and the overlapping portions at both ends in the longitudinal direction are fixed by the hook-and-loop fasteners 23a and 23b. At that time, the flange 12 of the heat insulating material 1 and the flange 22 of the sheet material 2 are aligned by moving the sheet material 2 in the circumferential direction so that the bolt through holes 12a and 22a overlap each other. Moreover, in order to make the fixing part by the surface fasteners 23a and 23b of the sealing member 2 more airtight, a silicone sealant may be applied to the edge of the overlapping part.

  After the heat insulating material 1 and the sheet material 2 are superposed as described above, a pressing member 30 is attached along the flange 22 of the sheet material 2. The holding member 30 is made of a steel plate and is configured by combining two semicircular members into an annular shape. The holding member 30 has an L-shaped cross section, and the vertical portion 30a includes the flange 12a and the sheet material of the heat insulating material 1. Bolt through holes similar to those of the second flange 22a are opened.

  Then, the holding member 30 is moved in the circumferential direction so that the bolt through holes of the heat insulating material 1 and the sheet material 2 coincide with the bolt through holes of the holding member 30, and as shown in FIG. It fixes to the fixing flange 40 provided so that the through-hole for penetrating the spindle 3a formed in the housing 1d of the side wall 1c of the furnace may be surrounded by bolting.

  According to such a sealing structure, the gap G between the support shaft 3a and the furnace wall is closed by the thickness of the main body 13 of the heat insulating material 1, and further, the outside air passes through the main body 21 of the outermost sheet material 2. Will not invade. In addition, airtightness is also secured at the joint portion between the flange 12 of the heat insulating material 1 and the flange 22 of the sheet material 2 by the vertical portion 30 a of the pressing member 30 and the fixing flange 40. Moreover, since the heat radiation from the support shaft 3a is insulated by the heat insulating material 1 and is kept below the heat resistant temperature of the fluororesin forming the sheet material 2, the sheet material 2 is hardly deteriorated by heat.

  On the other hand, as shown in FIG. 6, the other flange side is bolted to a fixing flange 60 provided in a bearing housing 50 that contains a similar pressing member 30 and contains a bearing (not shown) in an airtight manner. Secure with. Therefore, the same sealability and heat insulation can be obtained on the bearing side.

  Further, in order to seal the pipes exposed between the buildings, as shown in FIG. 7, the heat insulating material 1 and the sheet material 2 are overlapped, and a pressing member 30 is attached to each flange portion, and the building 65, It fixes to the fixing flanges 65b and 66b provided in the outer walls 65a and 66a of 66 by bolting. Thereby, the gap G can be sealed while the pipe 70 is insulated.

  In addition, when the piping 70 is long, it can be set as a structure as shown in FIG. The piping 70 is provided with a fixing flange 70b, the heat insulating material 1 and the sheet material 2 are overlapped, and the holding portion 30 is attached, and one of the fixing flanges 66b is bolted to the fixing flange 66b provided on the outer wall 66a of the building 66. The other is fixed to the fixing flange 70b of the pipe 70 by bolting. Thereby, the gap G can be sealed while being insulated. And the other exposed part of the piping 70 is insulated by winding another heat insulating material 75. Although not shown, the same seal structure is used on the other building side.

  The present invention will be further described below with reference to examples, but the present invention is not limited thereto.

(Test 1)
As shown in FIGS. 1 and 2, a heat insulating material is formed by laminating two layers of a glass fiber woven fabric having a diameter of 0.78 mm made of glass yarn having a diameter of 0.38 mm and heat-sealing an aluminum foil. 1 body part 13 was produced, and gaskets impregnated with rubber made of a woven ceramic cloth having a thickness of 2 mm as flanges 12 were attached to both ends thereof by sewing. Further, a hook-and-loop fastener 14a in which a glass fiber mat having a thickness of 4 mm is interposed on the surface of the aluminum foil at one end of the main body 13 to form an aramid fiber loop portion on an aramid resin base material. A hook-and-loop fastener 14b in which a stainless steel hook portion is formed on a base made of aramid resin by sewing a glass fiber mat having a thickness of 4 mm on the surface of the glass fiber woven fabric at the other end is sewn. It was attached by.

  As shown in FIGS. 3 and 4, flanges made of polytetrafluoroethylene having a thickness of 0.5 mm are provided at both ends of the body portion 21 of the sheet material 2 made of a polytetrafluoroethylene sheet having a thickness of 0.5 mm. 22 was attached by sewing. Further, a hook-and-loop fastener 23a in which a loop portion made of aramid fiber is formed on a base made of aramid resin is attached by sewing with a glass fiber mat having a thickness of 4 mm on the surface at one end of main body portion 21. Then, a hook-and-loop fastener 23b having a stainless steel hook portion formed on a base made of aramid resin was attached by sewing with a glass fiber mat having a thickness of 4 mm on the back surface at the other end.

  And sealing property was evaluated with the leak test apparatus shown in FIG. 9 using said heat insulating material 1 and the sheet | seat material 2. FIG. First, both ends of the heat insulating material 1 are fixed with the hook-and-loop fasteners 14a and 14b, and the sheet material 2 is put on the both ends, and the both ends are fixed with the hook-and-loop fasteners 23a and 23b. A silicone sealant was applied to produce a cylindrical body. In the cylindrical body, the inner diameter of the heat insulating material 1 is 260 mm, and the width of the main body is 190 mm. Next, the cylindrical body is bolted to a pair of left and right gas introduction members 110 formed by welding a straight pipe 100 and a disc-shaped flange 101 having a central hole that matches the outer diameter of the straight pipe 100. Fixed. The bolts were tightened at 8 places at regular intervals. The straight pipe 100 is sealed with caps 111a and 111b, and air is supplied from the nozzle 112 of one cap 111a.

  The sealing performance was evaluated by continuously supplying air with an internal pressure of 30 Pa for 10 minutes, and measuring the amount of air leakage during that time with a flow meter. As a result, the leakage amount was about 8000 SCCM (about 8 liters per minute), but it was confirmed that there was no practical problem if the leakage amount was about 10000 SCCM (about 10 liters per minute) or less. It can be said that it has a sealing property.

  Further, when the surface temperature of the sheet material 2 was measured by setting a thermocouple on the surface of the sheet material 2 so that the inner surface temperature of the heat insulating material 1 was 300 ° C., it was 116 to 213 ° C. The temperature was kept below the heat resistance temperature of ethylene.

(Test 2)
The amount of leakage was measured in the same manner as in Test 1 except that the silicone sealant was not applied to the end of the overlapping portion of the sheet material 2. As a result, the leakage amount was about 10,000 SCCM (about 10 liters per minute), and it was confirmed that there was no practical problem.

DESCRIPTION OF SYMBOLS 1 Heat insulating material 2 Sheet material 10 Inorganic fiber woven fabric 11 Metal foil 12 Flange 13 Main part 14a, 14b Surface fastener 21 Main part 22 Flange 23a, 23b Surface fastener 40 Fixing flange 60 Fixing flange 65, 66 Building 65b, 66b Fixing Flange 70 piping 70b fixing flange 75 heat insulating material

Claims (6)

A seal structure for sealing a gap between a high-temperature tubular member exposed across two structures and a through hole of both structures,
While winding the main body part of the heat insulating material formed by attaching flanges to both ends in the width direction of the band-shaped main body part, the ends of the main body part are connected to each other,
On the heat insulating material, while wrapping a sheet material formed by attaching flanges to both ends in the width direction of the belt-shaped main body part, and connecting the end parts of the main body part of the sheet material,
One of the overlapping portions of the flange of the heat insulating material and the flange of the sheet material is fixed to a fixing flange provided surrounding the through hole of one structure, and the other overlapping portion is fixed to the through hole of the other structure. A sealing structure characterized by being fixed to a fixing flange provided so as to surround or to a fixing flange provided to a tubular member.   The seal structure according to claim 1, wherein the heat insulating material is obtained by joining an inorganic fiber woven fabric and a metal foil, and the inorganic fiber woven fabric is wound so as to be in contact with a support shaft or a pipe. .   The seal structure according to claim 1 or 2, wherein the sheet material is fluororesin or fluororubber.   The ends of the main body portions of the heat insulating material and the end portions of the main body portion of the sheet material are connected by a hook-and-loop fastener provided at each overlapping portion. The seal structure described in 1.   The seal structure according to claim 4, wherein the portions of the sheet material connected by the hook-and-loop fastener are sealed with a silicone sealant.   The heat insulating material and the sealing material can be removed by screwing the overlapping portion between the flange of the heat insulating material and the flange of the sheet material and the fixing flange. The seal structure according to any one of the above.

Images