JP3790403B2 - Flexible joint device - Google Patents

Description

【００２８】
表１から明らかなように、実施例１〜５は比較例に比べて漏れが少なくなり、ガラスクロスに目止め処理を行った実施例２〜５は実施例１よりもさらに漏れ量が少なくなることが確認された。さらに、断熱材を被覆するガラスクロスの端部にも目止め処理を行った実施例３〜５は低い締付面圧でもシール性が良いことがわかった。
【００２９】
【発明の効果】
以上詳述したように、本発明のダクト用フレキシブルジョイント装置の構成によれば、火力発電所、製鉄所、ゴミ焼却場等の燃焼装置のダクトに使用しても、流体の漏れが少なくなり、良好なシール性を維持できるという効果が得られる。
【図面の簡単な説明】
【図１】本発明の一実施例を示すフレキシブルジョイント装置の縦断面図である。
【図２】本発明の他の実施例を示すフレキシブルジョイント装置の縦断面図である。
【図３】本発明の他の実施例を示すフレキシブルジョイント装置の縦断面図である。
【図４】本発明の他の実施例を示すフレキシブルジョイント装置の縦断面図である。
【図５】本発明の他の実施例を示すフレキシブルジョイント装置の縦断面図である。
【図６】前記筒状膜体に断熱材を組み合わせた従来のフレキシブルジョイント装置の縦断面図である。
【図７】従来のフレキシブルジョイント装置の縦断面図である。
【図８】従来のフレキシブルジョイント装置の縦断面図である。
【符号の説明】
１ａ，１ｂ ダクト
２ａ，２ｂ スリーブ
３ａ，３ｂ フランジ
４ 筒状膜体
４ａ シール膜部材
４ｂ 補強用ガラスクロス
５ａ，５ｂ スタッドボルト
６ 断熱材
７ 座金部材
８ ナット
９ ガラスクロス
９’ 目止め処理したガラスクロス
１０ 当て板
１１ ボルト
１２ ナット
１３ａ，１３ｂ ガラスクロス
１４，１４’ 耐熱繊維断熱材
１５ 積層したガラスクロス
１５’ 目止め処理したガラスクロス
１６ シール膜部材
１７ 補強用耐熱クロス
１８ 目止め処理したガラスクロス
１９ 外部保温用断熱材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a flexible joint device for a duct that absorbs thermal expansion and vibration of an exhaust gas duct, an air duct, and the like of a thermal power plant, a steel mill, a garbage incinerator, and the like.
[0002]
[Prior art]
Conventionally, a duct system passage through which exhaust gas discharged from a combustion apparatus such as a thermal power plant, a steel mill, a garbage incineration plant or the like can be used as a part of the duct system path in order to absorb the thermal expansion of the duct itself. There is provided a flexible joint device configured by using a tubular film body (for example, see Japanese Patent Publication No. 48-33274) having a flexible and stretchable property.
[0003]
According to the flexible joint device, expansion and contraction and vibration due to thermal expansion generated in the duct are absorbed by the displacement of the cylindrical film body. However, when a high-temperature exhaust gas flows through the duct, Since the film body is damaged, a heat insulating material provided inside the cylindrical film body is used.
[0004]
FIG. 7 shows a typical structural example of the high-temperature flexible joint device. In the figure, reference numerals 1a and 1b denote ducts separated so as to communicate with each other, 2a and 2b denote metal sleeves fixed to the ducts with bolts, 3a and 3b denote flanges fixed to the outer peripheral surface of each sleeve by welding, 4 Is a cylindrical film body having expansion / contraction flexibility that connects both flanges at the outer peripheral ends thereof.
[0005]
The tubular film body 4 having expansion / contraction flexibility is composed of a tubular sealing film member 4a made of a PTFE sheet (polytetrafluoroethylene resin) and reinforcing glass cloths 4b and 4b arranged on both surfaces thereof. Both ends are encased in a glass cloth 9 and fixed to the flanges 3a and 3b with bolts 11 and nuts 12 through a backing plate 10, respectively.
[0006]
A plurality of stud bolts 5a, 5b projecting radially from the outer peripheral surface of the sleeves 2a, 2b in the annular space between the opposed flanges 3a, 3b are fixed by welding, and the stud bolts 5a, 5b are fixed by welding. A heat insulating material 6 composed of a plurality of layers for blocking high heat generated from the duct is inserted into 5b. As this heat insulating material, a material in which a ceramic fiber blanket is covered with a glass cloth or a wire mesh is often used. Reference numeral 7 denotes a washer member for holding the heat insulating material 6, and reference numeral 8 denotes a nut attached to a bolt tip protruding from the outermost heat insulating material.
[0007]
[Problems to be solved by the invention]
The conventional high-temperature flexible joint device as described above has excellent heat insulation and sealing properties. However, since the stud bolts 5a and 5b are welded to the sleeves 2a and 2b and the heat insulating material 6 is inserted therein, the structure is Since the construction becomes complicated and it takes time to construct, there is a demand for a flexible joint device having a simpler structure where the temperature of the exhaust gas is relatively low and there is little expansion and contraction and vibration.
[0008]
Further, when the length of the flanges 3a and 3b in FIG. 7 is short, as shown in FIG. 8, the cylindrical film body 4 is provided at a position close to the sleeves 2a and 2b. If the heat-resistant fiber heat insulating material 19 for external heat insulation is disposed up to the vicinity of the flange, the temperature of the upper part of the flanges 3a and 3b rises, and the heat of the flange part near the flanges 3a and 3b breaks the seal film member 16 made of PTFE sheet. On the contrary, when the external heat insulation 19 is not in the vicinity of the flange, the flanges 3a and 3b are cooled and dew condensation occurs inside the flange, causing the flange to be corroded and the flange to be cracked by thermal stress. .
[0009]
In response to such a demand, a flexible joint device having a structure as shown in FIG. 6 is used.
In FIG. 6, 1a and 1b are ducts separated so as to be able to communicate, 2a and 2b are metal sleeves fixed to each duct with bolts, 3a and 3b are flanges fixed to the outer peripheral surface of each sleeve by welding, 4 Is a tubular film body having expansion / contraction flexibility, 16 is a tubular sealing film member made of a PTFE sheet, 17 is a glass cloth for reinforcement, and a glass cloth is placed inside the sealing film member with the glass cloth for reinforcement. A heat insulating material 14 made of a heat-resistant fiber blanket sandwiched between 13a and 13b is superposed. The cylindrical film body 4 combined with the heat insulating material 14 is wrapped at both ends with glass cloths 9 and fixed to the flanges 3 a and 3 b with bolts 11 and nuts 12 through the contact plate 10.
Since the tubular film body 4 shown in FIG. 6 has a structure in which the heat insulating material 14 is incorporated, it is not necessary to weld a stud bolt for attaching the heat insulating material inside the flange as shown in FIG. It is inexpensive and easy to install.
Furthermore, even when the length of the flanges 3a and 3b is short, since the heat insulating material is contained between the flange and the sealing film member made of the PTFE sheet, even if an external heat insulating material is inserted, damage to the sealing film member or flange There is no problem of corrosion.
[0010]
However, when the exhaust gas inside the sleeve enters the heat insulating material 14 through the glass cloth 13a, the flexible joint device having the above structure easily moves in the heat insulating material 14 made of a fiber blanket having many voids inside, and the arrow As shown by A and B, there is a problem that leakage occurs from the insertion hole portion of the bolt formed by fixing the cylindrical film body, the heat insulating material 14 and the glass cloth 9.
[0011]
The present invention has been made paying attention to the problems of the flexible joint device having the above-described configuration, and even when used in a duct of a combustion device such as a thermal power plant, a steelworks, a garbage incinerator, etc., leakage of exhaust gas etc. It aims at providing a flexible joint device with good sealing performance.
[0012]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a pair of communicable sleeves respectively connected to a pair of separated ducts, a pair of flanges provided so as to face the outer peripheral surface of each sleeve, In a flexible joint device comprising a tubular film body having expansion / contraction flexibility that connects between opposing flanges, the tubular film body has a tubular seal film member and an interval inside the seal film member. A cylindrical heat-resistant cloth provided, a heat-resistant seal member sandwiched between the seal film member and the heat-resistant cloth at both axial ends, and the seal film member and the heat-resistant cloth sandwiched between the two heat-resistant seal members It consists of heat-resistant fiber heat insulating material.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
As a result of intensive studies to find a structure of a tubular film body having a good sealing property combined with a heat insulating material, the present inventors have used a blanket such as a ceramic fiber as a heat insulating material to be combined inside the tubular film body. Further, when heat-resistant cloth such as glass cloth is laminated, the sealing performance is improved, but the heat resistance is lowered, and the temperature in the vicinity of the PTFE sheet as the sealing film member is considerably increased.
[0014]
Therefore, when a heat insulating material made of a heat-resistant fiber blanket is arranged in the central part between the flanges to which heat is directly applied in the cylindrical film body, and a heat-resistant sealing member is arranged only in the bolt insertion part of the flange, it is made of a PTFE sheet. It has been found that the temperature rise in the vicinity of the cylindrical sealing film member can be suppressed, and that the sealing performance of the cylindrical film body is improved by the presence of the heat-resistant sealing member disposed in the bolt insertion portion.
[0015]
As the heat-resistant sealing member, a laminated heat-resistant cloth, a laminated heat-resistant cloth that is surface-treated or impregnated with an organic binder such as a rubber solution, an inorganic binder, or a coating agent, or a heat-resistant fiber heat insulating material is used. It is preferable to use a member or the like encased in a heat-resistant cloth that has been sealed.
[0016]
As the fiber heat insulating material combined with the cylindrical sealing film member, a glass fiber blanket may be used in addition to the ceramic fiber blanket. In addition to the PTFE sheet alone, a PTFE sheet and a glass cloth may be used for the cylindrical sealing film member. A heat-sealed composite sheet or other resin or rubber sheet may be used.
[0017]
【Example】
Examples 1 to 5 of the present invention will be specifically described below with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same or similar member as FIG.
[0018]
Example 1
In FIG. 1, 1a and 1b are a pair of separated ducts, 2a and 2b are sleeves connected to the respective ducts, 3a and 3b are flanges provided on the respective sleeves, and 4 is an elastic flexible member connecting the flanges. The tubular film body 4 includes a tubular sealing film member 16 made of a PTFE sheet, a heat-resistant reinforcing cloth 17 overlaid on the outer surface thereof, and the sealing film member 16 includes a flange 3a. , 3b is a heat-resistant fiber blanket sandwiched between three heat-resistant cloths 15 laminated in three layers on the inner side of the part attached to 3b, and heat-resistant cloths 13a, 13b located inside the sealing film member 16 between the laminated heat-resistant cloths. A heat insulating cloth 13a for holding the laminated heat resistant cloth 15 and the heat insulating material 14 at both ends thereof. 3b wrapped with heat cloth 9 with the flange 3a by a bolt 11 and a nut 12 through caul 10, a configuration which is fixed to 3b.
[0019]
In the above configuration, the heat-resistant fiber heat insulating material 14 serves as a member for suppressing the temperature rise of the sealing film member 16, and the presence of the laminated heat-resistant cloth 15 in the axial direction through the bolt insertion hole portion and the heat-resistant fiber heat insulating material 14. It functions as a heat-resistant sealing member that prevents gas leakage.
Here, as the cylindrical film body, a ceramic fiber blanket 14 having a thickness of 25 mm, a length of 3500 mm, and a width of 350 mm is placed on the central portion of a glass cloth 13 a having a thickness of 1.5 mm, a length of 3500 mm, and a width of 450 mm. Three glass cloths 15 each having a thickness of 1.5 mm, a length of 3500 mm, and a width of 50 mm are stacked on both ends, and a glass cloth 13b having a thickness of 1.5 mm, a length of 3500 mm, and a width of 450 mm is further provided on the upper side. A glass cloth 17 having a thickness of 1.5 mm, a length of 3500 mm, and a width of 450 mm is stacked on the PTFE sheet 16 having a thickness of 0.3 mm, a length of 3500 mm, and a width of 450 mm on the upper side. It was covered with a glass cloth 9 having a length of 5 mm, a length of 3500 mm, and a width of 150 mm to obtain a cylindrical film body as shown in FIG.
[0020]
Example 2
The present embodiment shown in FIG. 2 has the same configuration as that of FIG. 1 except that glass cloths 15 ′ and 9 ′ treated by rubber-drawing are used for the heat resistant cloths 15 and 9 of FIG. According to this configuration, it is possible to improve the sealing performance of the heat-resistant sealing member that prevents gas leakage.
As the cylindrical film body of this example, a blanket 14 of ceramic fiber having a thickness of 25 mm, a length of 3500 mm, and a width of 350 mm is placed on the central portion of a glass cloth 13a having a thickness of 1.5 mm, a length of 3500 mm, and a width of 450 mm. Three glass cloths 15 'each having a thickness of 1.5 mm, a length of 3500 mm, and a width of 50 mm are placed on both ends, and three sheets of glass cloth 15' are stacked on top of each other, and a thickness of 1.5 mm, a length of 3500 mm, and a width A 450 mm glass cloth 13 b is stacked, and a PTFE sheet 16 having a thickness of 0.3 mm, a length of 3500 mm, and a width of 450 mm and a glass cloth 17 having a thickness of 1.5 mm, a length of 3500 mm, and a width of 450 mm are stacked on the upper side. Was covered with a rubberized glass cloth 9 ′ having a thickness of 1.5 mm, a length of 3500 mm, and a width of 150 mm to obtain a cylindrical film body as shown in FIG.
[0021]
Example 3
In this embodiment shown in FIG. 3, the heat-resistant cloths 13a and 13b shown in FIG. According to this structure, the sealing performance of the heat-resistant sealing member that prevents gas leakage can be further enhanced.
As the cylindrical film body of the present example, a ceramic fiber blanket 14 having a thickness of 25 mm, a length of 3500 mm, and a width of 350 mm was rubberized at both ends 80 mm in the width direction, and the thickness was 1.5 mm and the length was 3500 mm. A glass cloth 15 ′ having a thickness of 1.5 mm, a length of 3500 mm, and a width of 50 mm is coated on the upper and lower sides of the glass cloth 13 a and 13 b having a width of 450 mm and the glass cloth 13 a extending to both ends. 3 sheets are stacked, and a glass cloth 17 having a thickness of 1.5 mm, a length of 3500 mm, and a width of 450 mm is adhered to a PTFE sheet 16 having a thickness of 0.3 mm, a length of 3500 mm, and a width of 450 mm on the upper side of the glass cloth 13b. Then, both ends were covered with a rubberized glass cloth 9 ′ having a thickness of 1.5 mm, a length of 3500 mm, and a width of 150 mm to obtain a cylindrical film body as shown in FIG.
[0022]
Example 4
In this embodiment shown in FIG. 4, a heat-resistant cloth in which a heat-resistant fiber heat insulating material 14 ′ is treated with a U-shaped cross-section instead of the heat-resistant sealing member 15 ′ formed of a laminated heat-resistant cloth 15 ′ treated with rubber in FIG. 18 is used, and heat-resistant cloths 13a and 13b are made of a heat-treated cloth and a rubberized cloth at both ends thereof.
As the heat-resistant sealing member, only the heat-resistant cloth laminate subjected to the sealing treatment with rubber in FIG. 2 is easily deteriorated by heating, and the sealing performance is deteriorated. However, the heat-resistant fiber heat insulating material 14 ′ that does not deteriorate is sealed. According to the use of the heat-resistant sealing member wrapped with the cloth 18, it is possible to suppress a decrease in sealing performance due to heating.
[0023]
Here, as the cylindrical film body, a glass fiber having a thickness of 1.5 mm, a length of 3500 mm, and a width of 450 mm is obtained by rubberizing a blanket 14 of ceramic fiber having a length of 3500 mm and a width of 350 mm on both ends 80 mm in the axial direction. A heat-resistant sealing member that is placed on the center portion of the cloth 13a and wrapped with a glass cloth 18 having a thickness of 3500 mm and a width of 450 mm of ceramic fiber blanket 14 ′ having a U-shaped rubberized rubber cloth at both ends. Furthermore, a glass cloth 13b having a thickness of 1.5 mm, a length of 3500 mm and a width of 450 mm, which has been rubberized on both axial ends 80 mm, is stacked thereon, and a thickness of 0.3 mm, a length of 3500 mm, and a width is superimposed on the upper side. A 450 mm PTFE sheet 16 and a glass cloth 17 having a thickness of 1.5 mm, a length of 3500 mm, and a width of 450 mm are overlapped, and both ends are 1.5 mm thick, 3500 mm long, and wide. A cylindrical cloth body as shown in FIG. 4 was obtained by covering with 150 mm rubberized glass cloth 9 ′.
[0024]
Example 5
In this embodiment shown in FIG. 5, in order to reduce the number of rubberized cloths in FIG. 4, the width of the glass cloth 13a supporting the ceramic fiber blanket 14 is increased, and the extended portion is also used as the glass cloth 9 '. Since it is the same as that of the structure of FIG. 4 except having been made, the dimension specification of each structural member is abbreviate | omitted.
[0025]
Comparative Example The configuration shown in FIG. 6 is used as a comparative example.
The cylindrical film body of this comparative example includes a glass cloth 13a having a thickness of 1.5 mm, a length of 3500 mm, and a width of 450 mm, a blanket 14 of ceramic fibers having a thickness of 25 mm, a length of 3500 mm, and a width of 450 mm; A glass cloth 13b having a thickness of 5 mm, a length of 3500 mm, and a width of 450 mm is sequentially stacked, and a PTFE sheet 16 having a thickness of 0.3 mm, a length of 3500 mm, and a width of 450 mm and a glass of 1.5 mm, a length of 3500 mm, and a width of 450 mm are disposed on the upper side. The cloth 17 was overlapped, and both ends thereof were covered with a glass cloth 9 having a thickness of 1.5 mm, a length of 3500 mm, and a width of 150 mm to obtain a cylindrical film body as shown in FIG.
[0026]
The cylindrical film bodies of Examples 1 to 5 and the comparative example were attached to a practical test machine having a flange with a diameter of 1000 mm, air with a temperature of 500 ° C. and a pressure of 1000 mmAq was flowed, and a stroke of 50 mm (450 mm⇔) at a rate of once per minute. 400 mm) of repetitive reciprocating movement of 2,000 times and 10,000 times, and the bubble film formed when soap water is applied to the cylindrical film body after the test from the arrows A and B in FIG. It was evaluated by size. The test was performed under two conditions of 5 MPa and 10 MPa as the surface pressure for fastening the cylindrical film body. The test results are shown in Table 1.
[0027]
[Table 1]

[0028]
As is clear from Table 1, Examples 1 to 5 have less leakage than the comparative examples, and Examples 2 to 5 in which the sealing treatment is performed on the glass cloth have a smaller amount of leakage than Example 1. It was confirmed. Furthermore, it turned out that Examples 3-5 which performed the sealing process also to the edge part of the glass cloth which coat | covers a heat insulating material have good sealing performance even with a low clamping surface pressure.
[0029]
【The invention's effect】
As described in detail above, according to the configuration of the flexible joint device for ducts of the present invention, even when used for a duct of a combustion device such as a thermal power plant, a steel mill, a garbage incineration plant, fluid leakage is reduced, The effect that good sealing performance can be maintained is obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a flexible joint device showing an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a flexible joint device showing another embodiment of the present invention.
FIG. 3 is a longitudinal sectional view of a flexible joint device showing another embodiment of the present invention.
FIG. 4 is a longitudinal sectional view of a flexible joint device showing another embodiment of the present invention.
FIG. 5 is a longitudinal sectional view of a flexible joint device showing another embodiment of the present invention.
FIG. 6 is a longitudinal sectional view of a conventional flexible joint device in which a heat insulating material is combined with the cylindrical film body.
FIG. 7 is a longitudinal sectional view of a conventional flexible joint device.
FIG. 8 is a longitudinal sectional view of a conventional flexible joint device.
[Explanation of symbols]
1a, 1b Duct 2a, 2b Sleeve 3a, 3b Flange 4 Tubular membrane 4a Seal membrane member 4b Glass cloth for reinforcement 5a, 5b Stud bolt 6 Heat insulating material 7 Washer member 8 Nut 9 Glass cloth 9 'Glass cloth subjected to sealing treatment DESCRIPTION OF SYMBOLS 10 Base plate 11 Bolt 12 Nut 13a, 13b Glass cloth 14, 14 'Heat-resistant fiber heat insulating material 15 Laminated glass cloth 15' Sealed glass cloth 16 Sealing membrane member 17 Heat-resistant cloth 18 Reinforcing glass cloth 19 Thermal insulation for external heat insulation

Claims (2)

A pair of communicable sleeves respectively connected to a pair of separated ducts, a pair of flanges provided so as to face the outer peripheral surface of each sleeve, and a stretchable flexibility connecting between the opposed flanges In the flexible joint device comprising a cylindrical membrane body, the cylindrical membrane body includes a cylindrical sealing membrane member, a cylindrical heat-resistant cloth provided at intervals inside the sealing membrane member, and an axial direction A heat-resistant seal member sandwiched between the seal film member and the heat-resistant cloth at both ends, and a heat-resistant fiber heat insulating material sandwiched between the seal film member and the heat-resistant cloth between the heat-resistant seal members. A flexible joint device. 2. The flexible joint device according to claim 1, wherein the heat-resistant sealing member is wrapped with a laminated heat-resistant cloth, a laminated heat-resistant cloth that has been subjected to sealing treatment, or a heat-resistant cloth that has been heat-treated.

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