JP2013221544A - Wrapping gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To considerably improve installation work efficiency while providing stable quality with excellent sealing performance over a long period of time with simple configuration.SOLUTION: A wrapping gasket 10 includes a fluororesin envelope 11 forming an annular storage space S1 with an upper wall part 11a, a lower wall part 11b and an inner peripheral wall part 11c; a first annular corrugated plate 12 inserted in the storage space S1 to face the lower face of the upper wall part 11a and formed with annular crest parts 12a and annular trough parts 12b alternately in a radial direction; a second annular corrugated plate 13 inserted in the storage space S1 to face the upper face of the lower wall part 11b and formed with annular crest parts 13a and annular trough parts 13b alternately in a radial direction; an annular elastic plate 14 formed of an elastic material and inserted between the first corrugated plate 12 and the second corrugated plate 13; and a first support plate 15 inserted between the first corrugated plate 12 and the elastic plate 14 and lower in hardness than the first corrugated plate and lower in elasticity than the elastic plate 14.

Description

  The present invention relates to a wrapping gasket that is sandwiched in a flange connection portion whose flange surface is not flat, such as a flange connection portion of a glass lining device or the like.

  The glass lining device is repeatedly baked at a high temperature so as to be subjected to a glass lining process during the production. Therefore, thermal stress repeatedly acts on the metal base material of the device, and distortion occurs on the flange surface of the glass lining device. Therefore, in Patent Document 1, a sheet obtained by impregnating a layered felt with a paste of a curable resin is inserted into a cover (outer jacket) made of a corrosion-resistant material as a gasket for sealing a flange connection portion of a glass lining device. Wrapping gaskets have been proposed. According to this, since the curable resin is cured after the shape of the wrapping gasket is adjusted to the unevenness of the flange surface, a good sealing property can be obtained as a gasket for a glass lining device.

  As another conventional technique, there is a method of maintaining a good seal on the flange surface by performing so-called “gasket adjustment” in which the thickness of the gasket itself is manually adjusted. In this gasket adjustment, the outer shape of the gasket is fitted to the distortion of the flange surface by partially inserting a sheet-like insert into the circumference of the wrapping gasket and changing the thickness of the gasket in the circumferential direction. Let

Japanese Patent Laid-Open No. 3-282067

  However, in the case of Patent Document 1, since a resin that cures over time is used, the cost is increased, and it is necessary to manage the work of impregnating the resin and the curing of the resin, so that the installation workability is good. Absent. Further, when unexpected plastic deformation occurs in the outer jacket or the like due to long-term use, the curable resin impregnated in the layered felt is cured, so that the sealing performance may be lowered.

  In addition, the gasket adjustment that has been conventionally performed is very difficult, for example, it is necessary to measure the distortion in each circumferential portion of the flange surface and adjust the number of inserts to be inserted in accordance with the distortion. Complex and time consuming. Furthermore, since the thickness of these gaskets is adjusted in accordance with the distortion of the flange surface, it is necessary to take a positioning measure such as marking so as not to cause displacement. Moreover, since gasket adjustment is performed with respect to each flange, the gasket after adjustment can be used only for the flange.

  Therefore, the present invention has an object to provide a stable quality with a good sealing property over a long period of time and to greatly improve the installation workability in a wrapping gasket.

  A wrapping gasket according to the present invention is a wrapping gasket sandwiched between flange connecting portions of a glass lining device, wherein an annular upper wall portion, an annular lower wall portion, the upper wall portion and the lower wall portion are arranged on the inner periphery. A fluororesin jacket that has an annular inner circumferential wall portion that is connected to each other on the side, and that forms an annular accommodation space in the upper wall portion, the lower wall portion, and the inner circumferential wall portion; and a lower surface of the upper wall portion An annular first corrugated plate that is inserted into the housing space so as to be opposed and in which annular ridges and annular valleys are alternately formed in the radial direction, and the upper surface of the lower wall portion is opposed to the upper surface. Inserted between the first corrugated plate and the second corrugated plate, and the annular second corrugated plate having annular crests and annular troughs alternately formed in the radial direction. An annular elastic plate made of an elastic material, and inserted between the first corrugated plate and the elastic plate, Lower hardness than the first corrugated, and comprises a, and a lower elastic first support plate than said elastic plates.

  According to the said structure, since the cyclic | annular elastic flat plate is inserted in the accommodation space of a fluororesin outer jacket, a wrapping gasket deform | transforms naturally so that it may closely_contact | adhere to the unevenness | corrugation of the flange surface of a flange connection part. Even when the wrapping gasket is displaced in the circumferential direction, the elastic flat plate is freely deformed and restored, so that the close contact is maintained, so that positioning measures such as marking can be omitted. Therefore, the conventional complicated installation work becomes unnecessary. Moreover, even if unexpected plastic deformation occurs in the fluororesin jacket or the like due to long-term use, the elastic flat plate can be elastically restored freely to maintain close contact. Since the first corrugated plate and the second corrugated plate are opposed to the upper wall portion and the lower wall portion of the fluororesin jacket, respectively, the fluororesin jacket is flanged by the annular crests of the corrugated plates. High pressure contact with each other concentrically and securely sealed. Therefore, when the flange connecting portion is fastened with a plurality of fasteners at intervals in the circumferential direction, both the number of fasteners and the fastening force can be reduced, and installation workability is further improved. In addition, since the outer shape of the wrapping gasket can be freely deformed and restored by the restoring force of the elastic flat plate, the gasket once used can be applied to other flange connecting portions.

  In addition, if only the elastic plate is inserted between the first corrugated plate and the second corrugated plate, when the flange connecting portion is fastened at intervals in the circumferential direction from a plurality of fasteners, Since the portion directly clamped by the fastener in the elastic flat plate is locally suddenly deformed, the seal pressure may be weakened at a portion immediately adjacent to the directly clamped portion. However, in the configuration of the present invention, since the first support plate having lower elasticity than the elastic plate is inserted between the first corrugated plate and the elastic plate, the tightening pressure from the fastener is applied by the first support plate. Dispersion in the circumferential direction facilitates transmission, and local sudden deformation of the wrapping gasket is suppressed as a whole. Furthermore, since the first support plate is lower in hardness than the first corrugated plate and appropriately absorbs the clamping pressure transmitted to the first corrugated plate, the corrugated plate and the elastic flat plate having the functions described above are protected, Quality is stable.

  As is clear from the above description, according to the present invention, it is possible to provide a stable quality with a good sealing property over a long period of time while having a simple configuration, and to greatly improve the installation workability. Become.

It is principal part sectional drawing of the glass lining apparatus which concerns on 1st Embodiment of this invention. It is principal part sectional drawing of the wrapping gasket shown in FIG. It is principal part sectional drawing of the wrapping gasket of 2nd Embodiment of this invention.

  Embodiments according to the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view of a main part of a glass lining device 1 according to a first embodiment of the present invention. As shown in FIG. 1, the glass lining device 1 of this embodiment is a chemical reactor, for example, and includes a device main body 2 and a cover 3 that covers an opening 2 c of the device main body 2. The apparatus main body 2 and the cover 3 have a flange connection portion 4. The device main body 2 and the cover 3 are made of metal, and glass lining treatment is applied to the inner surfaces 2a and 3a and the flange surfaces 2b and 3b in order to impart corrosion resistance. In the glass lining treatment, the firing is repeated at a high temperature of 800 to 900 degrees. Therefore, thermal stress repeatedly acts on the metal base material of the device main body 2 and the cover 3, and relatively large strain is applied to the flange surfaces 2 b and 3 b. Has occurred. Then, in a state where the wrapping gasket 10 is sandwiched between the flange surfaces 2b and 3b facing each other, the flange connecting portion 4 is clamped by a plurality of fasteners 5 (clamps) at equal intervals in the circumferential direction. It is tightened.

  FIG. 2 is a cross-sectional view of a main part of the wrapping gasket 10 shown in FIG. As shown in FIG. 2, the wrapping gasket 10 for a glass lining device includes a fluororesin jacket 11, a first corrugated plate 12, a second corrugated plate 13, an elastic flat plate 14, and a first support 15. The first corrugated plate 12, the second corrugated plate 13, the elastic flat plate 14, and the first support 15 are wrapped by the fluororesin jacket 11.

  The fluororesin jacket 11 includes an annular upper wall portion 11a, an annular lower wall portion 11b, and an annular inner circumferential wall portion that connects the upper wall portion 11a and the lower wall portion 11b to each other on the inner circumferential side (in the radial direction). 11c, and the upper wall portion 11a, the lower wall portion 11b, and the inner peripheral wall portion 11c form an annular housing space S1. That is, the accommodation space S1 is open to the outside on the outer peripheral side (outside in the radial direction). The fluororesin jacket 11 has corrosion resistance and heat resistance. For example, tetrafluoroethylene resin (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (PFA), tetrafluoroethylene-hexafluoride. Formed using fluororesin such as propylene copolymer resin (FEP), tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer resin (EPE), tetrafluoroethylene-ethylene copolymer resin (ETEE) ing.

  The first corrugated plate 12 has annular ridges 12a and annular troughs 12b alternately formed in the radial direction, and is generally annular. The first corrugated plate 12 is made of metal. For example, stainless steel or carbon steel can be used as the metal. The first corrugated plate 12 is inserted into the accommodation space S1 so as to face and contact the lower surface of the upper wall portion 11a of the fluororesin jacket 11, and the peak portion 12a and the trough portion 12b of the first corrugated plate 12 are In order to avoid the formation of a sharp edge, the arc shape is smooth in a sectional view.

  The second corrugated plate 13 has the same structure and material as the first corrugated plate 12. That is, the second corrugated plate 13 is an annular metal plate as a whole, in which annular crests 13a and annular troughs 13b are alternately formed in the radial direction. The second corrugated plate 13 is inserted into the accommodation space S1 so as to face and contact the upper surface of the lower wall portion 11b of the fluororesin outer jacket 11, and the first corrugated plate 12 and the second corrugated plate 13 The inner peripheral end is configured not to contact the fluororesin jacket 11 at least in a state where no external force is applied to the wrapping gasket 10.

  The elastic flat plate 14 is an annular flat plate made of an elastic material, and is inserted between the first corrugated plate 12 and the second corrugated plate 13. In the present embodiment, the elastic flat plate 14 is formed of rubber. The rubber has a hardness of 50 or more and 100 or less. In addition, the hardness of the rubber in this embodiment is the hardness when measured with a durometer (type A) based on JIS standard (JIS K 6253). The thickness of the elastic flat plate 14 is preferably thicker than the thickness of the fluororesin jacket 11 and the first and second corrugated plates 12 and 13. The thickness of the elastic flat plate 14 is preferably 1 to 10 mm, and more preferably 2 to 6 mm. When the thickness of the elastic flat plate is 1 mm or less, there is a possibility that the distortion of the flange surface treated with the glass lining cannot be sufficiently absorbed. On the other hand, if the elastic flat plate is too thick, it is necessary to increase the tightening force of the flange, and the pressure applied to the fluororesin jacket that forms the gasket surface is different between the portion where the distortion of the flange is large and the portion where the flange is large. There is a risk that cracks may occur.

  The first support plate 15 is inserted between the first corrugated plate 12 and the elastic flat plate 14. The first support plate 15 is an annular flat plate having a lower hardness than the first corrugated plate 12 and a lower elasticity than the elastic flat plate 14. In the present embodiment, the first support plate 15 uses a non-asbestos-based sheet gasket obtained by mixing a non-asbestos fiber with a heat-resistant rubber binder and rolling vulcanization, but is not limited thereto. The thickness of the first support plate 15 is preferably thinner than the thickness of the elastic flat plate 14 and thicker than the thickness of the fluororesin jacket 11 and the first and second corrugated plates 12 and 13.

  According to the configuration described above, since the annular elastic flat plate 14 is inserted into the housing space S1 of the fluororesin jacket 11, the wrapping gasket 10 is formed on the flange surfaces 2b and 3b of the flange connection portion 4 by its elasticity. Naturally deforms so as to adhere to the unevenness. And even if the wrapping gasket 10 is displaced in the circumferential direction, the elastic flat plate 14 is freely deformed and restored, so that the close contact is maintained, so that positioning measures such as marking can be omitted. Therefore, the conventional complicated installation work becomes unnecessary. In addition, even if unexpected plastic deformation occurs in the fluororesin jacket 11 and the first support plate 15 due to long-term use, the elastic flat plate 14 can be elastically restored freely to maintain close contact. And since the 1st corrugated sheet 12 and the 2nd corrugated sheet 13 have opposed and contacted respectively with the upper wall part 11a and the lower wall part 11b of the fluororesin outer sheath 11, the cyclic | annular form of these corrugated sheets 12 and 13 is carried out. With the ridges 12a and 13a, the fluororesin jacket 11 comes into high pressure contact with the flange surfaces 2b and 3b in a concentric manner and is securely sealed. Therefore, the number of fasteners 5 arranged at equal intervals in the circumferential direction and the tightening force can be reduced, and the installation workability is further improved. Further, since the outer shape of the wrapping gasket 10 can be freely deformed and restored by the restoring force of the elastic flat plate 14, the gasket 0 once used can be applied to other flange connecting portions.

  Further, if only the elastic plate 14 is inserted between the first corrugated plate 12 and the second corrugated plate 13, the flange connecting portion 4 is fastened with a plurality of fasteners 5 at intervals in the circumferential direction. When this is done, the portion of the elastic flat plate 14 that is directly clamped by the fastener 5 is locally suddenly deformed, so that the seal pressure may be weakened at a portion immediately adjacent to the directly clamped portion. However, in the wrapping gasket 10, since the first support plate 15 having lower elasticity than the elastic flat plate 14 is inserted between the first corrugated plate 12 and the elastic flat plate 14, the tightening pressure from the fastener 5 is the first. 1 The support plate 15 is easily dispersed and transmitted in the circumferential direction, and local sudden deformation of the wrapping gasket 10 is suppressed as a whole. Further, since the first support plate 15 has a lower hardness than the first corrugated plate 12 and appropriately absorbs the clamping pressure transmitted to the first corrugated plate 12, the first corrugated plate 12 having the above-described function, The elastic flat plate 14 is protected and the quality is stabilized.

  Further, since the hardness of the rubber forming the elastic flat plate 14 is 50 or more, the portion of the elastic flat plate 14 that is directly tightened by the fastener 5 is further suppressed from being locally deformed and directly tightened. It is possible to suitably prevent the seal pressure from being weakened at a portion immediately adjacent to the portion. And since the hardness of the rubber | gum which forms the elastic flat plate 14 is 100 or less, the function which deform | transforms the wrapping gasket 10 so that it may closely_contact | adhere to the unevenness | corrugation of the flange surfaces 2b and 3b of the flange connection part 4 can be ensured.

  Furthermore, since the thickness of the elastic flat plate 14 is 1 mm to 10 mm, even if the diameter of the flange connection portion 4 of the glass lining device 1 is increased and the distortion of the flange surfaces 2b and 3b is increased, the thickness of the elastic plate 14 depends on the diameter. The thickness of the elastic flat plate 14 is set, and the elastic flat plate 14 can sufficiently absorb the distortion of the flange surfaces 2b and 3b.

(Second Embodiment)
FIG. 3 is a cross-sectional view of a main part of a wrapping gasket according to a second embodiment of the present invention. In addition, about the structure which is common in 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. As shown in FIG. 3, the inner diameter of the wrapping gasket 110 of the second embodiment is larger than that of the first embodiment. Therefore, the thickness of the wrapping gasket 110 is also larger than that of the first embodiment.

  In the wrapping gasket 110, a second support plate 116 is inserted between the second corrugated plate 13 and the elastic flat plate 14. The second support plate 116 has the same structure and material as the first support plate 15. That is, the second support plate 116 has a lower hardness than the second corrugated plate 13 and a lower elasticity than the elastic flat plate 114. The elastic flat plate 114 has a thickness of 1 mm to 10 mm. That is, the relationship between the inner diameter and thickness of the elastic flat plate 114 is the same as that in the first embodiment.

  According to the configuration described above, since the second support plate 116 having lower elasticity than the elastic flat plate 114 is inserted between the second corrugated plate 13 and the elastic flat plate 114, the tightening pressure from the fastener 5 Is distributed in the circumferential direction by the second support plate 116 and easily transmitted. Therefore, in combination with the first support plate 15, local sudden deformation of the wrapping gasket 110 as a whole can be more suitably suppressed.

  The present invention is not limited to the above-described embodiment, and the configuration can be changed, added, or deleted without departing from the spirit of the present invention. The above embodiments may be arbitrarily combined with each other. For example, some configurations or methods in one embodiment may be applied to other embodiments.

  As described above, the wrapping gasket according to the present invention provides a stable quality with a good sealing property over a long period of time while having a simple configuration, and has an excellent effect of greatly improving installation workability. It is beneficial to apply to a wide range of glass lining equipment that can demonstrate the significance of this effect.

DESCRIPTION OF SYMBOLS 1 Glass lining apparatus 2b, 3b Flange surface 4 Flange connection part 5 Fastening tool 10,110 Wrapping gasket 11,111 Fluororesin jacket 12 First corrugated plate 13 Second corrugated plate 14,114 Elastic flat plate 15 First support plate 116 First 2 support plates S1, S2 accommodation space

Claims (4)

A wrapping gasket sandwiched between flange connections,
An annular upper wall portion; an annular lower wall portion; and an annular inner peripheral wall portion that connects the upper wall portion and the lower wall portion to each other on the inner peripheral side, and the upper wall portion and the lower wall portion. And a fluororesin jacket that forms an annular housing space in the inner peripheral wall,
An annular first corrugated plate that is inserted into the housing space so as to face the lower surface of the upper wall portion, and annular crests and annular troughs are alternately formed in the radial direction;
An annular second corrugated plate that is inserted into the housing space so as to face the upper surface of the lower wall portion, and annular crests and annular troughs are alternately formed in the radial direction;
An annular elastic plate inserted between the first corrugated plate and the second corrugated plate and formed of an elastic material;
A wrapping gasket, comprising: a first support plate inserted between the first corrugated plate and the elastic flat plate, having a hardness lower than that of the first corrugated plate and lower than that of the elastic flat plate. .   The wrapped gasket according to claim 1, wherein the elastic flat plate is made of rubber and has a hardness of 50 or more and 100 or less.   The wrapped gasket according to claim 1 or 2, wherein the elastic flat plate has a thickness of 1 mm or more and 10 mm or less.   2. A second support plate that is inserted between the second corrugated plate and the elastic flat plate, has a lower hardness than the second corrugated plate, and lower in elasticity than the elastic flat plate. 4. A wrapping gasket according to any one of claims 1 to 3.

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