JP3103729B2 - Flange connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange connection structure used when, for example, a cover plate is detachably attached to a cylindrical inspection port of a water storage tank.

[0002]

2. Description of the Related Art Conventionally, when a cover plate is attached to a cylindrical inspection port protruding from the outer periphery of a large tank such as a water storage tank, a flange connection structure as shown in FIG. 9 has been employed, for example. .

[0003] Specifically, a flat mounting flange 33 is welded and fixed to the tip of an inspection port 32 protruding from the outer periphery of the tank 31, and a plurality of bolt insertion holes 34 are provided on the mounting flange 33 at predetermined intervals. They are arranged in a ring.
A flat plate-like mounting flange 36 is formed on the outer periphery of the cover plate 35, and a plurality of bolt insertion holes 37 are annularly arranged at predetermined intervals on the mounting flange 36.

When the inspection port 32 is closed by the cover plate 35, the mounting flange 36 is joined to the outer surface of the mounting flange 33 via a flat seal 38, and each bolt on the both flanges 33, 36 is connected. The insertion holes 34 and 37 are matched. In this state, a plurality of bolts 39 are inserted into the bolt insertion holes 34 and 37, and a nut 40 is screwed into the bolts 39, and the flanges 33 and 36 are fastened and fixed. It is attached to the opening edge of the inspection port 32.

[0005]

However, in the conventional flange connection structure, the mounting flange 36 on the outer periphery of the cover plate 35 is formed in a flat plate shape. for that reason,
The entire cover plate 35 including the mounting flange 36 is formed of a metal plate such as a steel plate having a large thickness.
Needs to have a predetermined strength. Therefore, the cover plate 35
However, there is a problem that it is difficult to attach and detach the cover plate 35 to and from the inspection port 32.

The present invention has been made by paying attention to such problems existing in the prior art. The purpose is to secure sufficient strength even if the thickness of the flange is reduced, and to reduce the overall weight, especially when it is mounted on a cover plate or the like. An object of the present invention is to provide a flange connection structure capable of facilitating an attaching / detaching operation.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a flange to be mounted is joined to a mounting flange, and a plurality of bolts are used to connect the flanges. In the structure, the mounting flange is formed with a protruding portion protruding on a side opposite to a joint surface with respect to the mounting flange, and the protruding portion is formed with a plurality of bolt insertion holes for inserting the bolts. A seal accommodation groove for accommodating the seal is formed on the joint surface of the attached flange so that it is located inside,
Projection of flat extension on inner and outer circumference of circular body
It is a shape that has been made.

In the invention according to claim 2, in the flange connection structure according to claim 1, corresponding to the protrusion of the mounting flange, the bolt insertion hole, and the seal accommodation groove,
The mounting flange also has a protrusion, a bolt insertion hole, and a seal accommodation groove.

According to a third aspect of the present invention, in the flange connection structure according to the first aspect, a reinforcing bent portion is formed on at least an outer peripheral edge of the mounting flange of the two flanges. It is.

[0010]

In the flange connection structure according to the first aspect, a protruding portion is formed on the mounting flange, and a bolt insertion hole is formed on the protruding portion. Therefore, a bolt is inserted from the bolt insertion hole into the bolt insertion hole of the mounting flange, and when the nut is screwed into the bolt, the protruding portion exerts a spring action to firmly tighten the two flanges. be able to.

Further, since the mounting flange is deformed and reinforced by forming the protrusions and the seal accommodating grooves, sufficient strength can be ensured for the mounting flange even if the plate thickness is small. Therefore, when this mounting flange is formed on the outer periphery of the lid plate and embodied in mounting the lid plate,
The weight of the entire lid plate can be reduced, and the attaching and detaching operation can be easily performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a flange connection structure embodying the present invention will be described below in detail with reference to FIG.

As shown in FIG. 1, a water storage tank 1 made of stainless steel is formed in a cylindrical shape, and water is stored therein. The cylindrical inspection port 2 made of stainless steel is welded and fixed to the outer periphery of the water storage tank 1, and a mounting flange 3 is welded and fixed to the outer periphery of the tip. The cover plate 4 made of stainless steel is formed in a disk shape so as to close the opening edge of the inspection opening 3, and a mounting flange 5 that can be joined to the mounting flange 3 is integrally formed on the outer periphery thereof. The central portion of the cover plate 4 is curved for reinforcement.

The annular projecting portion 6 is formed so as to project concentrically with the projecting portion 6 over the entire circumference of the flange 5 to be attached, and to project to the side opposite to the joint surface with the mounting flange 3. A plurality of bolt insertion holes 7 are formed on the portion 6 at predetermined intervals. The annular seal accommodation groove 8 is formed on the joint surface of the mounting flange 5 so as to be located concentrically inside the protrusion 6. The annular bent portion 9 for reinforcement is formed on the outer peripheral edge of the mounted flange 5 so as to project in the same direction as the projecting portion 6.

The protruding portion 10 is formed over the entire circumference of the mounting flange 3 so as to correspond to the protruding portion 6 of the mounting flange 5, and protrudes to the side opposite to the joint surface with the mounting flange 5. The plurality of bolt insertion holes 11 are formed at predetermined intervals on the protruding portions 10 of the mounting flange 3 so as to correspond to the respective bolt insertion holes 7 of the mounting flange 5.
The annular seal accommodating groove 12 is formed on the joint surface of the mounting flange 3 on the concentric circumference of the projecting portion 10 so as to correspond to the seal accommodating groove 8 of the mounted flange 5. The reinforcing annular bent portion 13 is formed on the outer peripheral edge of the mounting flange 3 so as to project to the opposite side corresponding to the bent portion 9 of the mounted flange 5.

An annular seal 14 having a circular cross section is provided between the seal receiving grooves 8 and 12 when the mounting flange 5 is joined to the mounting flange 3 and the cover plate 4 is mounted on the opening edge of the inspection opening 2. To maintain the airtightness between the flanges 5 and 3. The plurality of bolts 15 are inserted into the bolt insertion holes 7, 11 of the flanges 5, 3.
Are fastened and fixed to the mounting flange 3.

In the flange connection structure of this embodiment, projecting portions 6 and 10 are formed on the mounting flange 5 and the mounting flange 3, and a plurality of bolt insertion holes 7 and 10 are formed on the projecting portions 6 and 10. 11 are formed. For this reason, the bolts 15 are inserted into the bolt insertion holes 7 and 11, and the nuts 16 are screwed into the bolts 15.
When attaching the cover plate 4 to the opening edge of the inspection port 2, the projections 6, 10 exert a spring action, and the flanges 5, 3 can be firmly fixed.

Further, in the flange connection structure of this embodiment, the mounting flange 5 and the mounting flange 3 are formed by forming the projections 6 and 10 and the seal accommodation grooves 8 and 12.
It is reinforced by being deformed into irregularities. For this reason, even if a thin metal plate is used, sufficient strength can be ensured for each of the flanges 5 and 3. Therefore, the mounting flange 5
Can be reduced, the lid plate 4 can be easily raised and lowered, and can be easily attached to and detached from the opening edge of the inspection opening 2.

Further, as compared with the case of FIG.
Since the width of the flange is small, the diameter of the entire flange can be reduced, and the weight can be further reduced.

[0020]

Next, another embodiment of the present invention will be described with reference to FIGS.
A description will be given based on FIG. The description of the configuration that is the same as or similar to that of the first embodiment will be omitted, and the description will be supplemented only for the configuration that is different from the first embodiment.

In the second embodiment shown in FIG. 2, the mounting cylinder 21 is formed on the inner peripheral edge of the mounting flange 3 in the same direction as the direction in which the bent portion 13 protrudes. The front end of the inspection port 2 is welded and fixed at two locations inside and outside the periphery. The mounting flange 5 is formed separately from the lid plate 4 so as to have the same shape as the mounting flange 3, and a mounting cylinder portion 22 is formed on the inner peripheral edge thereof in the same direction as the protruding direction of the bending portion 9. ing. A base opening portion of a cover plate 4 having a closed cylindrical shape is welded and fixed to the inner periphery of the distal end of the mounting cylinder portion 22 at two positions inside and outside.

In the third embodiment shown in FIG. 3, the mounting flange 5 is formed separately from the cover plate 4 and the like so as to have the same shape as the mounting flange 3. The base opening of the closed cylindrical cover plate 4 or the base opening of the cylindrical connecting pipe 23 is fitted and fixed to the inner periphery of the mounting flange 5 by welding. Also, the bent portions 9 and 13 on the outer periphery of the flanges 5 and 3 are omitted.

In the fourth embodiment shown in FIG. 4, the inner peripheral edge of the mounting flange 3 is welded and fixed at two locations inside and outside with the inner peripheral edge joined to the tip end surface of the inspection port 2. The mounting flange 5 is formed separately from the cover plate 4 or the like so as to have the same shape as the mounting flange 3, and has a base end face of the closed cylindrical cover plate 4 or a base of the cylindrical connection pipe 23 on its inner peripheral edge. The end faces are joined and welded and fixed at two locations inside and outside. Also,
As in the third embodiment, the bent portions 9 and 13 on the outer periphery of both flanges 5 and 3 are omitted.

In the third and fourth embodiments, the inspection port 2 is a fluid passage pipe. Accordingly, in the second to fourth embodiments, in addition to having the same operation as the first embodiment, the mounting flange 3 and the mounting flange 5
Can be manufactured and used as a common part. In the second embodiment and the fourth embodiment, the welding points of the mounting flange 3 to the inspection port 2 and the welding points of the mounting flange 5 to the cover plate 4 and the like are two places inside and outside. The fixing strength of the flanges 3 and 5 can be secured.

In particular, in the third and fourth embodiments, since the diameter of the flange can be reduced, when the heat insulating material is wound around the pipes 2 and 23, the amount of the heat insulating material can be reduced, and the time required for winding is reduced.

Next, in a fifth embodiment shown in FIG.
The seal 14 has a shape in which a flat plate-like extending portion 25 protrudes from the inner periphery and the outer periphery of the main body 24 having a circular cross section.
Therefore, when the seal member 14 is interposed between the seal accommodating grooves 8 and 12 of the flanges 5 and 3, the main body 24 is disposed between the seal accommodating grooves 8 and 12 and the extending portions 25 are It is arranged between the 5 and 3 joining surfaces. Therefore, the airtightness between the flanges 5 and 3 can be improved.

In the sixth embodiment shown in FIGS. 6 and 7, the locking recess 26 is formed by partially cutting out the upper part of the bent portion 13 of the mounting flange 3. The locking projection 27 is formed by partially bending the upper part of the bent portion 9 of the mounting flange 3 in the opposite direction so as to correspond to the locking recess 26. The width of the locking projection 27 is determined by the locking recess 2.
6 is formed so as to be substantially the same as or slightly smaller than the width of the same.

Therefore, when the cover plate 4 is attached to the inspection opening 2, the locking projection 27 is engaged with the locking concave portion 26, so that the lid plate 4 is temporarily fixed to the opening edge of the inspection opening 2. be able to. The engagement between the locking projection 27 and the locking recess 26 allows the bolt insertion hole 11 on the mounting flange 5 to be inserted.
Are positioned so as to match the bolt insertion holes 7 on the mounting flange 3. Therefore, it is not necessary for the operator to insert the bolt 15 into each of the bolt insertion holes 7 and 11 while holding the cover plate 4 at a position corresponding to the opening edge of the inspection port 2, and the mounting operation of the cover plate 4 is facilitated. It can be carried out.

In the seventh embodiment shown in FIG. 8, in addition to the structure of the sixth embodiment, the retaining portion 28 is
7 is bent downward from the front end. Therefore, in the seventh embodiment, when the locking projection 27 is engaged with the locking concave portion 26 and the cover plate 4 is temporarily fixed and supported on the opening edge of the inspection port 2, the locking portion 28 engages. The stopper piece 27 can be prevented from coming off from the locking recess 26. For this reason, when the bolt 15 is inserted into each of the bolt insertion holes 7 and 11, or when the nut 16 is screwed into the bolt 15, the locking projection 27 separates from the locking recess 26 and the lid Board 4
Can be prevented from falling.

The present invention may be embodied by changing the configuration as follows, for example. (A) In each of the above embodiments, the protrusion 10, the seal accommodation groove 12, and the bent portion 13 on the mounting flange 3 are omitted,
The mounting flange 3 is formed in a flat plate shape. (B) The connection structure of the flange of the present invention may be applied to a connection structure between different members such as a pair of connecting pipes, in addition to the above embodiments.

Further, technical ideas other than the claims grasped from the embodiment will be described below together with their effects. (1) The connection structure of a flange according to any one of claims 1 to 3, wherein a reinforcing curved portion is provided at a central portion of the mounting flange. According to this configuration, the strength of the mounted flange can be improved, the thickness can be reduced, and the weight can be further reduced. (2) The flange connection structure according to any one of claims 1 to 3, wherein the seal has a circular cross section. With this configuration, the width of the seal can be reduced and the diameter of the flange can be reduced.

[0032]

Effects of the Invention The present invention, more because it is constructed as described, even by reducing the thickness of the flange, it is possible to ensure sufficient strength Rutotomoni mounting flange and human
It is possible to improve the airtightness between both flanges
it can. Further, when the present invention is mounted on a cover plate or the like, the entire weight can be reduced, and the attaching / detaching operation can be easily performed.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing a flange connection structure of a first embodiment.

FIG. 2 is a partial longitudinal sectional view showing a connection structure of a flange according to a second embodiment.

FIG. 3 is a partial longitudinal sectional view showing a connection structure of a flange according to a third embodiment.

FIG. 4 is a partial longitudinal sectional view showing a connection structure of a flange according to a fourth embodiment.

FIG. 5 is a partial longitudinal sectional view showing a connection structure of a flange according to a fifth embodiment.

FIG. 6 is a partial longitudinal sectional view showing a flange connection structure according to a sixth embodiment.

FIG. 7 is a partial cross-sectional view taken along line VII-VII in FIG. 6;

FIG. 8 is a partial longitudinal sectional view showing a connection structure of a flange according to a seventh embodiment.

FIG. 9 is a partial longitudinal sectional view showing a conventional flange connection structure.

[Explanation of symbols]

1. Water storage tank 2. Inspection port 3. Mounting flange 4.
Cover plate, 5: mounting flange, 6: projecting portion, 7: bolt insertion hole, 8: seal accommodation groove, 9: bent portion, 10: projecting portion,
11: bolt insertion hole, 12: seal accommodation groove, 13: bent portion, 14: seal, 15: bolt, 16: nut.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-228483 (JP, A) JP-A-62-220483 (JP, A) JP-A-3-176700 (JP, A) 240685 (JP, A) Japanese Utility Model Showa 61-141289 (JP, U) Japanese Utility Model Showa 62-6417 (JP, U) Japanese Utility Model 5-1087 (JP, U) Japanese Patent Publication 4-50466 (JP, B2) (58) Field surveyed (Int.Cl. ⁷ , DB name) B65D 90/00-90/66 E04H 7/04 F16L 23/00-23/24

Claims (3)

(57) [Claims] 1. A connection structure of a flange in which a flange to be mounted is joined to the mounting flange and both flanges are fixed by a plurality of bolts, wherein the flange to be mounted projects to a side opposite to a joint surface with the mounting flange. Is formed, a plurality of bolt insertion holes for inserting the bolts are formed in the protruding portions,
A seal accommodation groove for accommodating a seal is formed on the joint surface of the mounted flange so as to be located inside the protrusion ,
The seal is flat on the inner and outer circumferences of the main body with a circular cross section.
Connection structure for multiple flanges with protruding extensions . 2. The mounting flange according to claim 1, wherein the mounting flange has a projection, a bolt insertion hole, and a seal accommodation groove corresponding to the projection, the bolt insertion hole, and the seal accommodation groove. Connection structure. 3. The flange connection structure according to claim 1, wherein a reinforcing bent portion is formed on at least an outer peripheral edge of the mounted flange of the two flanges.