JP2524600Y2 - Fastening structure of seal member and flange - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening structure for fastening a flange of a pipe or a reaction tank of a chemical plant.

[0002]

2. Description of the Related Art Corrosive raw materials and reaction products such as acidic compounds and basic compounds such as chlorine, hydrochloric acid, sulfuric acid and acetic acid are handled in chemical factories and the like. In order to prevent corrosion due to these corrosive raw materials and the like, pipes, towers, reaction vessels, heat exchangers and the like in which the inner surface and the facing surface of the flange are lined with high corrosion resistance are used.

[0003] In addition, generally, a seal member is provided between a pair of flanges in the pipe, the reaction tank, the heat exchanger, and the like.
It is constructed by flange joining. In this flange joining, if a hole is formed in the flange to join the flange with a bolt and a nut, the glass lining layer is damaged. Also, when fastening with bolts and nuts,
Corrosion may progress from the hole or the damaged portion, and the raw material may leak. Therefore, a glass-lined part or device is often joined to a pair of flanges by a clamp.

FIG. 4 is a schematic sectional view showing a conventional flange joining structure using a clamp.

In the illustrated example, a gasket 35 is provided between a flange 32 of a reaction vessel main body 31 and a flange 34 of a lid 33 for closing an opening of the reaction vessel main body 31.
A seal member 37 composed of a sheet 36 made of a highly corrosion-resistant fluoropolymer enclosing the gasket is interposed, and the flanges 32, 34 are clamped by a clamp 38.
Has been concluded.

On the other hand, the reaction in the reaction tank is performed under various conditions such as a reduced pressure system and a high temperature system. Further, in order to prevent the raw material and the reaction product from leaking from between the flanges 32 and 34 during the reaction, the flange 38 is provided by the clamp 38.
There are many cases where 2,34 is tightened.

However, since the sealing member 37 interposed between the flanges 32 and 34 includes the fluorine-based polymer sheet 36 having a small surface energy as a constituent element, the sealing member 37 easily slides on the flanges 32 and 34. In particular, in a reaction system using a solvent, the solvent is
Since the seal member 37 easily penetrates between the sheet 4 and the sheet 36, the seal member 37 is further easily slid. Therefore, the sealing member 37 easily moves inward of the reaction tank due to a reaction or retightening under conditions such as reduced pressure and high temperature. Then, when the sealing member 37 is drawn into the reaction tank, the sealing property cannot be secured, and the raw material and the reaction product leak from the non-sealing portion. In addition, the leaked raw materials not only corrode the reaction tank and peripheral devices, but also deteriorate the working environment and cause a fire.
In a remarkable case, the seal member 37 may be wrapped around the stirrer of the reaction tank, and the reaction may not be continued. Such a problem also occurs when a gasket made of a fluoropolymer is used in place of the seal member 37, or in a stainless steel device or a pipe that is flange-joined by a clamp.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a flange fastening structure in which a sealing member can be reliably held between flanges and high sealing performance can be ensured.

[0009]

To achieve the above object, according to an aspect of the present invention is a seal member disposed between a pair of flanges which are fastened by a clamp, the sealing member
But a gasket and a sheet that wraps the gasket
And a restricting portion is formed on the sheet, the restricting portion being engaged with the clamp or the flange and restricting the seal member from moving inward of the flange.

Further, the present invention has a structure in which a pair of flanges are fastened by a clamp via a sealing member , wherein the sealing member comprises a gasket and this gasket.
Is composed of a sheet encasing, on this sheet, and each other involved with the clamp or flange, restricting portion sealing member to regulate the movement inwardly of the flange are made form, provides a fastening structure of the flange I do.

[0011]

In the seal member and the fastening structure having the above-described structure, the restricting portion formed on the sheet of the seal member engages with the clamp, and can restrict the movement of the seal member from the clamp to the inside of the flange. Therefore, even if the reaction or the like is performed under reduced pressure or high temperature, or the flanges are retightened with a clamp, the seal member can be held at an appropriate position between the flanges.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 is a schematic sectional view showing an embodiment of the present invention, and FIG. 2 is a plan view showing the seal member of FIG. In this example, a fastening structure of a flange portion of a reaction tank is shown.

The reaction tank includes a flange 2 formed on the reaction tank main body 1, a flange 4 formed on a lid 3 for closing an opening of the reaction tank main body 1, an inner surface of the reaction tank main body 1, and a lid. The glass lining layers 5, 6 formed on the inner surface of the flange 3 and the facing surfaces of the flanges 2, 4, the ring-shaped sealing member 7 interposed between the flanges 2, 4, and the flanges 2, 4 are fastened. And a clamp 12.

Protrusions 2a and 4a are formed at the lateral ends of the flanges 2 and 4, respectively. Further, the clamp 12 has a screw hole formed therein, and a locking member 13 formed with a hook portion 13a which engages with the convex portion 4a. A screw member 14 formed with a hook portion 14a for engaging with the convex portion 2a;
A nut 15 is screwed to the screw member 14.

The sealing member 7 is composed of a ring-shaped gasket 8 as a core material and a sheet 9 made of a fluoropolymer enclosing the gasket. In such a sealing member 7, the gasket 8 deteriorates,
If cured or the sheet 9 is damaged, it can be easily replaced with a new gasket and / or sheet. Note that the sheet includes a substantially flat structure sometimes referred to as a film.

An outwardly extending piece 10 is formed at a plurality of locations on the sheet 9, and an insertion hole 11 through which the clamp 12 is inserted is formed in the extending piece 10. The insertion hole 11 is associated with the clamp 12 and functions as a restricting portion that restricts the seal member 7 from moving inward of the flanges 2 and 4.

In such a fastening structure, the flanges 2, 4
The protrusions 2a and 4a of the flanges 2 and 4 are engaged with the hooks 13a of the locking members 13 and the hooks 14a of the screw members 14 with the sealing member 7 interposed therebetween, and tightened with the nut 15. Thereby, the flanges 2 and 4 are fastened. Even if the flanges 2 and 4 are fastened by the clamp 12, the clamp 9 is inserted through the insertion hole 11 of the sheet 9, so that the movement of the sheet 9, and thus the seal member 7, into the reaction tank can be restricted. Therefore, even if the reaction is carried out in a reduced pressure system, a high temperature system, or when retightening is performed, the seal member 7 is securely held at an appropriate position between the flanges 2 and 4, and may be pulled into the reaction tank from the clamp 12. And high sealing performance can be secured.

FIG. 3 is a schematic perspective view showing a main part of a seal member according to another embodiment of the present invention. In this example, the ring-shaped sealing member 17 is composed of a ring-shaped gasket 18 and a highly corrosion-resistant sheet 19 surrounding the gasket 18 as described above. The sheet 19
Are formed on the side of the screw member, and the screw member 24 of the clamp is formed.
And a hook-shaped locking portion 21 which can be locked. The locking portion 21 functions as a restricting portion that engages with the screw member 24 of the clamp.

Even if such a seal member is used, it is possible to restrict the movement of the seal member 17 to the inside of the flange by the locking portion 21 and to secure a high sealing property.

The seal member does not need to be formed of the gasket and the sheet. For example, similarly to the sheet, the seal member is formed of a material having high corrosion resistance such as a fluoropolymer such as polytetrafluoroethylene or a silicone resin. It may be a ring-shaped gasket.

The regulating portion of the sheet constituting the sealing member is
In connection with the clamp or the flange, the movement of the seal member to the inside of the flange may be restricted. The restricting portion can be formed in an appropriate structure according to the structure of the clamp and the structure of the flange. For example, the restricting portion may be a hook-shaped engaging portion or an insertion hole for engaging with the screw member of the clamp, or an L-shaped engaging portion for engaging with the end of the flange. You may. The structure of the clamp is not limited to the above-described structure, and may be any structure as long as it can be fastened without penetrating a pair of flanges.

The parts and devices provided with the flange may be made of stainless steel or the like. However, the present invention is directed to a part or device in which the sealing member is slippery in relation to the flange, particularly, the facing surface of the flange. Is suitably applied to glass-lined parts and devices.

The present invention can be applied not only to the reaction tank, but also to apparatuses such as pipes, towers, and heat exchangers.

[0025]

According to the present invention, the seal member and the flange fastening structure can reliably hold the seal member between the flanges, and can ensure high sealing performance.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view showing the seal member of FIG.

FIG. 3 is a schematic perspective view showing a main part of a seal member according to another embodiment of the present invention.

FIG. 4 is a schematic sectional view showing a conventional flange joining structure.

[Explanation of symbols]

 2,4 ... flange 5,6 ... glass lining layer 7,17 ... seal member 8,18 ... gasket 9,19 ... sheet 11 ... insertion hole 12 ... clamp 21 ... locking part

Claims (4)

(57) [Scope of request for utility model registration] 1. A seal member provided between a pair of flanges fastened by a clamp, the seal member comprising:
But a gasket and a sheet that wraps the gasket
And a restricting portion is formed on the sheet, the restricting portion being associated with the clamp or the flange and restricting the seal member from moving inward of the flange. 2. A structure in which a pair of flanges are fastened by a clamp via a seal member, wherein the seal is
The member is a gasket and a seal that encloses the gasket.
Is composed of a bets, on this sheet, the clamp or flange and each other involved in regulating portion the sealing member to regulate the movement inwardly of the flange are made form, the fastening structure of the flange. 3. The flange fastening structure according to claim 1, wherein the facing surface of the flange is glass-lined. 4. The fastening structure for a flange according to claim 1, wherein the sealing member comprises a gasket and a corrosion-resistant sheet enclosing the gasket, and an insertion hole through which the clamp is inserted is formed in the sheet.