JPH04105269U - Flange seal structure - Google Patents

Abstract

(57) [Summary] [Purpose] Minimize local deformation on the gasket,
Prevent cracking. [Structure] Of a pair of flanges 11 and 12 to be tightened, one flange 11 is provided with a groove 13. Groove 1
3 is fitted with a gasket 14. The upper half of the gasket 14 has a circular arc shape with a radius R, and the groove 13 has a chamfer 13.
Perform A. In this case, the starting point 1 of the arc portion of the gasket 14
6 is located further back than the starting point 15 of the chamfer of the groove 13. Further, a dry solid lubricant film 17 is applied to the side surface of the groove portion 13. With this configuration, the entire gasket 14 receives deformation due to the approach of the flange 12, and the deformation of the gasket is prevented from being concentrated only in the portion above the groove portion 13.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is suitable for application to flanges, especially flange parts of high temperature gas reactor containment vessels. Regarding flange seal structure.

0002

[Conventional technology]

An example of the structure of a conventional flange seal is shown in FIGS. 4 and 5. It is clear from Figure 4 Of the pair of flanges 1 and 2 to be tightened, one flange 1 has a groove 3. A structure in which an elastomer gasket 4 is fitted into the groove 3. It becomes.

0003 The upper half of this gasket 4 has an arc shape with a radius R. Both have a rectangular lower half, and are shown in detail in Figure 5, which is an enlarged view of part B in Figure 4. As shown in FIG. It is configured to be located on the side.

0004

[Problem that the idea aims to solve]

However, in such a conventional flange seal structure, the gasket 4 is under pressure. When compressed, it becomes as shown in FIG. In other words, the distance between flange 1 and flange 2 As the distance becomes shorter by tightening bolts (not shown), the gasket 4 is deformed so that the width is expanded as shown by the broken line 4A in FIG. 5 and the solid line 4B in FIG. .

[0005] At this time, the gasket 4 also receives force in the direction of being pushed into the groove 3. However, since it gets caught at the starting point 6 of the chamfer 3A of the groove 3, the The result is that only the part responsible for the deformation. Therefore, excessive deformation occurs locally. This may cause the gasket 4 to crack.

[0006] This invention was devised to solve the problems of the conventional technology. To provide a flange seal structure that can prevent cracking of a jacket as much as possible. With the goal.

[0007]

[Means to solve the problem]

In order to solve the above problems, the present invention has developed a small number of flanges to be tightened. A flang with a groove provided on at least one side and a gasket having an arc portion fitted into the groove. In the double-seal structure, the starting point of the arc portion of the gasket is aligned with the chamfer of the groove. It is located further back than the starting point, and an inertial solid lubricant film is applied to the sides of the groove. It is something.

[0008]

[Effect]

According to the above method, the width of the gasket increases as the flange approaches. Even if the groove is deformed, no catching will occur at the starting point of the chamfer of the groove. Also, Low coefficient of friction on the sides of the groove allows sliding between the gasket and the groove become. As a result, the entire gasket is subject to deformation due to the approach of the flanges, so Deformation does not concentrate only in the area above the groove, and local deformation on the gasket is minimized. The shape can be kept small.

[0009]

【Example】

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. Figure 1 is a cross-sectional view showing the flange seal structure according to this example, and FIG. 2 is an enlarged view of part A in FIG. FIG. 3 is an explanatory diagram of the operation of this embodiment.

0010 As shown in FIGS. 1 and 2, one of the pair of flanges 11 and 12 to be tightened is A groove 13 is provided in the one flange 11, and a gasket is inserted into the groove 13. 14 are fitted together. The upper half of the gasket 14 has a radius R. It has an arc shape, and the lower half is rectangular. In addition, the groove portion 13 has a chamfer 13A. is applied.

[0011] In this embodiment, as shown in detail in FIG. The starting point 16 of the circular arc portion of the gasket 14 is located further into the groove 13 than the starting point 15 of the gasket 14. I'm leaving it there. As a specific example, for example, for a gasket 14 with a height of 20 mm. is from the starting point 15 of the chamfer 13A of the groove 13 to the starting point 16 of the circular arc portion of the gasket 14. It is preferable to set this side to the back side by 1 mm or more. Note that the chamfer 1 of the groove portion 13 If 3A has an R shape, the starting point of R can be considered to be the same as the starting point 15 of the chamfer 13A. stomach.

0012 On the other hand, a dry solid lubricant film 17 is applied to the side surface of the groove portion 13 . in particular , polytetrafluoroethylene fine particles, or graphite, molybdenum disulfide The resin and its binder are suspended in a solvent and applied or sprayed. to the side surface of the groove 13, and then air-dried or heated to volatilize the solvent. A method of dispersion can be adopted. This dry solid lubricant film 17 may Therefore, it may also be applied to the bottom surface of the groove portion 13.

[0013] It is also possible to use other lubricants such as oil and grease. These are used to fill the space between the groove 13 and the gasket 14 when assembling the gasket. Not only does this make the work of expelling air extremely difficult, but it also attracts dust, etc. There is a great danger that the characteristics of the cable will be lost.

[0014] The advantages of using polytetrafluoroethylene spray mentioned above include Since it can be expected to have a rust-preventing effect when dried, it will prevent the sealing performance from decreasing due to surface roughness caused by rust. One of the points is that it can prevent.

[0015] According to the configuration of the present embodiment described above, the gasket 14 prevents the flange 12 from approaching. Accordingly, the width increases as shown by the broken line 14C in FIG. 2 and the solid line 14D in FIG. Even if it is deformed, it will get caught at the starting point 15 of the chamfer 13A of the groove 13. do not have. In addition, since the friction coefficient on the side surfaces of the groove 13 is low, the gasket 14 and the groove 1 It becomes possible to slide between 3 and 3.

[0016] As a result, as shown in FIG. 3, the deformation of the gasket 1 due to the approach of the flange 12 4, the deformation is concentrated only in the part above the groove 13. Therefore, local deformation of the gasket 14 can be significantly suppressed. By this Therefore, cracking of the gasket 14 can be prevented.

[0017] Note that this invention is applicable to flanges that use elastomer seals in general. .

[0018]

[Effect of the idea]

As described above, according to the present invention, the flange seal structure using a gasket , position the starting point of the arc of the gasket further back than the starting point of the chamfer of the groove. In addition, by applying a dry solid lubricant film to the side surface of the groove, The entire gasket can absorb the deformation caused by the approach of the flanges, and the gasket Deformation no longer concentrates only on the part above the groove of the cut. therefore, Local deformation of the gasket can be kept to a minimum, preventing gasket cracks, etc. This has the effect of being able to be prevented as much as possible.

[Submission date] June 24, 1991

[Procedural amendment 1]

[Name of document to be amended] Specification

[Correction target item name] 0007

[Correction method] Change

[Correction details]

[0007]

[Means to solve the problem]

In order to solve the above problems, the present invention provides a flange seal structure in which a groove is provided in at least one of a pair of flanges to be tightened, and a gasket having an arcuate portion is fitted into the groove. The starting point is located further back than the starting point of the chamfer of the groove, and a dry solid lubricant film is applied to the side surface of the groove.

[Procedural amendment 2]

[Name of document to be amended] Specification

[Correction target item name] 0011

[Correction method] Change

[Correction details]

In this embodiment, as shown in detail in FIG. 2, the starting point 16 of the arcuate portion of the gasket 14 is positioned further into the groove 13 than the starting point 15 of the chamfer 13A of the groove 13. ing. As a specific example, for a gasket 14 having a height of 20 mm, for example, the starting point 16 of the circular arc portion of the gasket 14 is desirably located further back than the starting point 15 of the chamfer 13A of the groove portion 13 by 1 mm or more. In addition, when the chamfer 13A of the groove part 13 has an R shape, the starting point of the R may be considered to be equivalent to the starting point 15 of the chamfer 13A.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a flange seal structure according to an embodiment of the present invention.

FIG. 2 is an enlarged view of section A in FIG. 1;

FIG. 3 is an explanatory diagram of the operation of the present invention.

FIG. 4 is a sectional view showing an example of a conventional flange seal structure.

FIG. 5 is an enlarged view of section B in FIG. 4;

FIG. 6 is an explanatory diagram of the operation of a conventional example.

[Explanation of symbols]

11 Flange 12 Flange 13 Groove 13A Chamfer 14 Gasket 15 Starting point of chamfering 16 Starting point of arc part 17 Dry solid lubricating film

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Hideki Asayama Mitsubishi Heavy Industries, 1-1 Akunoura-cho, Nagasaki City, Nagasaki Prefecture Inside Nagasaki Shipbuilding Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A flange seal structure in which a groove is provided in at least one of a pair of flanges to be tightened, and a gasket having an arcuate portion is fitted into the groove, wherein the origin of the arcuate portion of the gasket is the origin of the chamfer of the groove. A flange seal structure characterized in that the groove is located further back than the groove, and a dry solid lubricant film is applied to the side surface of the groove.