JPS608227Y2 - Flange connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flange connection structure capable of preventing corrosion at a flange connection portion of a container filled with a fluid such as a high-pressure insulating gas.

BACKGROUND ART Conventionally, when assembling and connecting a plurality of members, such as containers or containers or pipes, it has been common practice to connect them via flanges.

FIG. 1 schematically shows the assembly and connection of a completely sealed container filled with a fluid such as a high-pressure insulating gas.

That is, container 1 and container 2 filled with high-pressure insulating gas are connected by flange "A".

FIG. 2 shows a detailed connection structure of the flange A′ in FIG. 1.

That is, a flange 5 having a female threaded portion 4a and a groove for attaching a gasket is sandwiched between a container 1 and a container 2 in which a high-pressure insulating gas 3 is sealed. .

Here, the reason why the female threaded portion 4a and the flange 5 having the groove are mounted in a sandwich manner is as follows.

(b) Machining gasket grooves on large objects like containers is time-consuming.

(b) If the flange 5 comes off when the containers 1 and 2 are disassembled, it takes time to reassemble them.

Therefore, the flange 5 usually needs to be fixed to either container 1 or 2, and for this purpose, the female threaded portion 4
A is provided.

On the other hand, the high-pressure insulating gas 3 is sealed with a gasket 6, and the flange 7 of the container 1 (hereinafter referred to as the upper flange) and the flange 8 of the container 2 (hereinafter referred to as the lower flange) are placed between them. The flange (hereinafter referred to as an intermediate flange) 5 having a female threaded portion 4a is used for tightening with a stud, nut, or spring lock 9 having a male threaded portion 4b.

Further, in the figure, reference numeral 10 denotes a space existing between the male threaded portion 4b of the stud and the flange, and is a hollow hole portion of the upper flange and the lower flange 8.

In this way, conventionally, the container 1 is connected in such a connected state.
and container 2 are tightened during assembly.

However, in the structure shown in FIG. 2 as described above, water W enters through the gap between the threaded part of the upper nut and the spring lock part "Btl", and the water W stays in the hollow hole 10 of the upper flange 7. Put it away.

That is, there is a threaded portion 4 between the intermediate flange 5 and the stud.
, this prevents the discharge of the infiltrated water W and causes the water W to stay in the hollow hole 10 .

As a result, this water W enters the flange joint surface 11 between the upper flange 7 and the intermediate flange 5 and corrodes this flange joint surface 11, and as a result, the tightening between the containers 1 and 2 becomes airtight. The disadvantage is that sexuality is threatened.

This invention was made to solve the above-mentioned drawbacks, and its purpose is to provide a threaded connection between the female threaded part of the flange, which has a groove in the longitudinal direction of a male threaded member such as a bolt, and forms a blank hole. By providing a space that communicates with both sides of the flange connection part, water will not accumulate in the hole in the male threaded member of the flange connection part, preventing corrosion of the flange joint surface and ensuring a highly reliable airtight structure. The purpose of the present invention is to provide a flange connection structure that allows for flexible flange connection.

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 3a and 3b are longitudinal sectional views showing the structure of a stud or bolt as a male threaded member according to the present invention.

That is, as shown in the drawing, this stud or bolt 12 has a drainage groove 13 machined in the longitudinal direction from the middle part to the other end.

FIG. 4 shows that the upper and lower flanges 7.8 of the containers 1 and 2 described above are connected to grooved studs 12 as shown in FIG. 3 above.
This figure shows the structure of a flange connection part which is tightened with a nut and spring lock 14 via an intermediate flange 5 having a female threaded part 4a, and the same parts as in FIG. 2 are given the same reference numerals. .

That is, the drainage groove 13 of the stud 12 forming a space is configured to communicate with the hollow hole 10 of the upper flange 7 and the hollow hole 10 of the lower flange 8.

Therefore, if the flanges 5, 7.8 are connected in this manner, the water W that has entered the bolt hole 10 through the threaded portion of the upper nut or the gap between the spring lock portion 44c'' will be removed from the water drain provided in the stud 12. Since the drainage groove 13 extends between the empty hole 10 of the upper flange 7 and the empty hole 10 of the lower flange 8, water is drained from the empty hole 10 to the outside through the drainage groove 13.

As a result, water W does not stay in the hollow hole 10, that is, the flange connection part, so the part is always kept dry and corrosion occurs on the flange joint surface 11 between the upper flange 7 and the intermediate flange 5. An extremely reliable airtight structure can be obtained.

Next, a second embodiment of the present invention will be described with reference to the drawings.

FIGS. 5a and 5b are longitudinal sectional views showing the structure of a stud or bolt as a male threaded member according to the present invention.

In other words, as shown in the figure, this stud or bolt 15 has a water drainage groove 1 extending a certain length in its middle part.
6 is processed.

FIG. 6 shows that the upper and lower flanges 7.8 of the containers 1 and 2 described above are connected to grooved studs 15 as shown in FIG. 5 above.
This figure shows the configuration of a flange connection part that is tightened through an intermediate flange 5 having a female threaded part 4a in a nut/spring clamp 18, and the same parts as in FIG. 2 are given the same reference numerals. show.

In this case, a drain hole 17a for draining water W is provided on the lower side of the lower flange 8 with a drain washer 17.
Install.

That is, in this embodiment, as shown in the drawing, the drainage groove 16 of the stud 15 forming the space is configured to communicate with the hollow hole 10 of the upper flange 7 and the hollow hole 10 of the lower flange 8. do.

Therefore, if the flanges 5, 7.8 are connected in this way, the water W that has entered the bolt hole 10 through the gap between the threaded part of the upper nut and the spring lock part "C" will be absorbed by the water W that has entered the bolt hole 10. Since the drainage groove 16 extends between the blank hole 10 of the upper flange 7 and the blank hole 10 of the lower flange 8, water is discharged from the blank hole 10 to the outside through the drainage groove 16 and the drain washer 17. It turns out.

As a result, as in the first embodiment, water W does not stay in the flange connection part, so the part is always kept dry and the flange joint surface 11 between the upper flange 7 and the intermediate flange 5 Corrosion will not occur in this case, and a highly reliable airtight structure can be obtained.

Further, in this case, although it is necessary to provide a drainage washer 17, on the other hand, unlike the first embodiment, the drainage groove is not machined up to the tip of the stud, so when machining the drainage groove 16, In addition to saving time and effort, the tightening of the flange can be further strengthened.
Its reliability can be further improved.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be similarly implemented in the following manner.

In the above embodiment, the case where the container 1 and the container 2 are connected has been described, but it goes without saying that the present invention is not limited to this and can be similarly applied to, for example, connecting large pipes.

In addition, the present invention can be modified and implemented in various ways without changing the gist thereof.

As explained above, according to the present invention, a groove is formed in the longitudinal direction of a male threaded member such as a bolt, so that a space is formed so as to communicate with both sides of the screw threaded part with the female threaded part of the flange forming the blank hole part. This feature prevents water from accumulating in the hollow hole of the male threaded member of the flange connection, preventing corrosion of the flange joint surface, and ensuring a highly reliable airtight structure. A flange connection structure can be provided.

[Brief explanation of drawings]

Figure 1 is a diagram showing an overview of the connection structure between containers, Figure 2
The figure is a schematic diagram showing the conventional flange connection configuration, Figure 3a
, b, and 4 are schematic diagrams showing one embodiment of the present invention, and Figures 5a, b, and 6 are schematic diagrams showing a second embodiment of the present invention. 1.2... Container, 5... Middle flange, 7, 8... Upper and lower flanges, 11...
...Flange joint surface, 12. 15------ Stud, 13, 16... (for water drainage) groove, 17...
...Drainage washer, 17a...Drainage hole.

Claims (3)

[Scope of utility model registration request] (1) In a structure in which a threaded member is passed through a plurality of flanges that are in contact with each other and each flange is tightened together, the flange tightening in the male threaded member through hole provided in the flange is performed at the intermediate portion in the direction. a female threaded portion that is screwed together with the male threaded member, a blank hole portion is provided on both sides of the female threaded portion except for the female threaded portion, and the male threaded member that is penetrated by the through hole has at least one of the female threaded portions in the longitudinal direction thereof. A flange connection structure characterized by having a drainage groove that communicates with the hollow hole of the flange and leads to the outside of the flange. (2) The flange connection structure according to claim 1, wherein the drainage groove is formed from approximately the middle of the male threaded member to the other end thereof. (3) The flange connection structure according to claim 1, wherein the water drainage groove is formed approximately at a certain length in the middle of the male threaded member.