JPS5868550A - Sealing device for fluid - Google Patents

Abstract

PURPOSE:To obtain predetermined sealing performance at all times by giving an elastic sealing material in a groove circumferential tension, radial compression, etc. in a device which clamps sections among the flange surface of the opening section of a pressure vessel and a cover plate, etc. through the elastic sealing material inserted into the groove. CONSTITUTION:In the titled device such as an inner pressure structure type one, the groove 4 is formed to the flange 2 of the opening section of the pressure vessel 1, the annular sealing member 3 is inserted into the groove 4 and the cover plate 5 is covered, the peripheries of the cover plate 5 and the flange 2 are clamped by a clamping member 6, and a pressed fluid 7 in the vessel 1 is hermetically sealed. In this case, the sealing member 3 takes approximately circular section form, and the groove 4 is shaped in inverted convex character form. The shape of the groove 4 is formed by combining a wide section X, a shallow section W, a narrow section Y and a deep section V, and the size of the narrow section Y among these sections is made slightly smaller than size Z corresponding to the approximately diameter of the sealing member 3, and depth size U is set to approximately half the size Z. Accordingly, the sealing member 3 is properly deformed in the groove 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid-tight device for a container containing a fluid medium.

At fastening joints using flanges, etc. of containers containing a fluid medium (hereinafter referred to as fluid),
A structure in which an annular groove (hereinafter referred to as groove) is provided on one of the 7 and 79 surfaces and a so-called O-ring is inserted into the groove for sealing is widely adopted.

In the rectangular groove type 01) ring sealing device represented by the Japanese Industrial Standards, etc., the groove width is made sufficiently wider than the cross-sectional diameter of the O-ring because it mainly utilizes the self-tightening effect of the O-ring due to the internal or external pressure of the fluid it contains. To provide flexibility in deformation, the outer diameter of the groove is set to approximately match the outer diameter of the O-ring for internal pressure structures, and the inner diameter of the groove is set to approximately match the inner diameter of the O-ring for external pressure structures.

For example, FIG. 1 shows a conventional sealing structure as described above for an internal pressure structure, and FIG. 2 shows a structure for an external pressure structure. In Figures 1 and 2, 7 lunges (7) at the opening of the container (1) are shown.
2) annular seal member (3) (hereinafter referred to as seal member)
A groove (4) is formed into which the material is inserted. Then, the sealing member (3) is inserted into the groove (4) to cover the cover plate (5).
) and the periphery of the 7 langes (2) with fastening members (6) such as bolts and nuts, the container (
1) Seal the fluid (7) filled inside. Figure 1 shows a case where the fluid pressure inside the container (1) is higher than the outside.
Further, FIG. 2 shows a case where the fluid pressure inside the container (1) is lower than that outside. In FIGS. 1 and 2, the sealing function is expected to be due to the self-tightening effect of the sealing member (3) due to internal or external pressure, so there is a problem that the sealing effect relatively decreases as the fluid pressure difference decreases. There is a point.

Because the diameter is smaller than the groove width, it cannot be held in the groove simply by inserting it into the groove. That is, there is no problem when the groove is sealed and fastened with the groove open upward, but if the groove is in the horizontal or downward position w4, the O-ring will fall out of the groove. A small and lightweight sealing part can be fastened and sealed with some labor, but a sealing part for a large and heavy object is difficult and dangerous to work with.

As a countermeasure to this, apply an appropriate adhesive to the bottom of the groove continuously or intermittently! The problem with this method is that the non-volatile residue of the adhesive adheres unevenly, causing unevenness in the sealing line of the sealing member.
There is a risk of fluid leakage. In addition, there is a risk that excess adhesive that protrudes when compressing the sealing member may dissolve, evaporate, or adhere to the fluid in the form of clumps. It is often difficult to trim. Furthermore, the solvent component in the adhesive may damage the rubber, which is the main material of the sealing member.

The present invention has been made in consideration of the above points, and its purpose is to provide a constant seal tightening force regardless of the magnitude of the pressure difference between the inside and outside, to fit the seal member into the groove, and to provide a seal. It is an object of the present invention to provide a fluid sealing device that has good workability such that the member is held inside the groove and has excellent sealing performance.

An embodiment of the present invention will be described below with reference to FIGS. 3(a) and 3(b). A groove (4) into which a seal member (3) made of an elastic member such as a rubber member is inserted is formed in a seven flange (2) of the opening of a container (not shown). Figure 3 (a) K
As shown, the sealing member (3) has a circular cross-sectional shape, and the groove (4) is formed in an inverted convex shape. Also? -Role member (3)
Fi, dimension 2 is #! ! Corresponds to the diameter of a bar. Furthermore, the shape of the groove (4) is formed from a combination of a dimension of a relatively wide part X1 a dimension of a shallow part w1 a dimension Y of a relatively narrow width part, and a dimension of a deep part V,
It has an inverted convex shape. Of these, dimension Y is the sealing member (3
) is smaller than dimension 2, and its depth U is equal to half the IK height of dimension 2 of the seal member (3).

By forming it in this way, when the seal member (3) is inserted into the groove (4) K, an elastic deformation reaction force corresponding to the interference is generated, and the frictional force of the groove surface of the groove (4) is applied to the seal member. (3) O
A sealing member (3) can be held inside the groove (4).

In Figure 3(b), the daughter, cover plate (5), etc. are attached to 7 lunges (
2) The seal member (3) is shown after being deformed as it is tightened by a K-stop fastening member (not shown). The cross-sectional area of the cocote seal member (3) is not as large as the cross-sectional area of the groove (4) space, but it is close to the cross-sectional area, for example, the cross-sectional area ratio is 80 to 10.
It should be about 0%. By making this selection, a constant tightening force can be obtained regardless of the pressure difference of the fluid.

Next, two other embodiments of the present invention will be described with reference to FIGS. 4 to 9. In FIG. 4, the cross-sectional shape of the sealing member (3) is formed into a shape other than a circle, for example, a substantially rectangular shape, and the groove (4) is formed into a substantially rectangular shape.
The same effect as the embodiment of the present invention can be obtained by selecting the width dimension of the narrow fitting portion of ) to correspond to dimension 2 in the circular cross section of FIG.

Figures 5 to 7 show the shape of the groove (4) being approximately rectangular, including a trapezoid with a very slight inclination, and the bottom width dimension Z being slightly larger than the groove width dimension Y-. By selecting the sealing member (3) having a cross-sectional shape, the same sealing effect as in the embodiment of the present invention can be obtained.

In Fig. 8, if the self-tightening effect due to the internal and external pressure difference can be fully expected, it is only necessary to consider the retention during insertion, so the cross-sectional area ratio of the groove (4) and the seal member (3) is set relatively. Lower the width of the hem of the seal member (3) to the groove (
Regarding the relationship between the width and the dimension Y in 4), the dimension X may be selected to be slightly larger than the dimension Y, as described above, and a sealing member (3) having a different cross-sectional shape may be selected.

In Fig. 9, the inner diameter A of the seal member (3) before the groove (4) K is inserted is selected to be slightly smaller than the inner diameter B of the inner surface of s (4), and the seal member (3) is In the case of circumferential tension, it is needless to say that it is not always necessary to maintain the pressure by the compression reaction force caused by the difference between the width of the seal member (3) and the width of the groove (4). The sealing member (3) may have any cross-sectional shape other than circular, for example, so long as it does not twist or twist by using the inner surface of the groove (4) as a guide during insertion.

As explained above, according to the present invention, there is provided an annular seal member mainly made of a rubber member and having a cross section such as a circular shape, a polygonal shape with appropriate rounding at the corners, a convex shape, a cross shape, etc., and an annular groove into which the seal member is fitted. In other words, the maximum width of the entire or part of the annular seal member is selected to be larger than the minimum width of a part or the entire annular groove, and its radiation when the annular seal member is inserted is selected. The inner diameter of the annular groove is selected to be slightly larger than the inner diameter of the annular seal member, and the inner diameter of the annular groove is selected to be slightly larger than the inner diameter of the annular seal member. It is possible to apply tensile deformation in the circumferential direction and hold it inside the annular groove by friction caused by the reaction force. Therefore, a large degree of freedom can be obtained in the posture during large-scale assembly work, and when the tightening is completed, the annular seal member deforms so that the annular groove interior KFf is fully filled and exhibits its sealing ability, so that the self-tightening effect is achieved. It also eliminates the risk of leakage occurring at low internal pressures as expected.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 and 2 are sectional views showing the main parts of a conventional fluid sealing device, respectively. FIG. 3 (1L(b) is a sectional view showing the main parts of the fluid sealing device of the present invention) Figures 4 to 9 are sectional views showing main parts of other embodiments of the present invention. (1)... Container (2)... 7 langes (
3)...Annular seal member (4)...Annular groove (5)
... Lid plate (6) - Fastening member (7)
...Fluid medium agent Patent attorney Mr. Inoue Figure 2 Figure 3 Figure 4 sW:J Figure 9

Claims (4)

[Claims] (1) The flange surfaces of the openings of pressure vessels holding pressurized fluid therein, or the openings of the vessels and the lid plate, etc., are fastened and connected via an annular seal member made of an elastic member, and the surfaces of the pressure vessels that are in contact with each other are connected by means of an annular seal member made of an elastic member. An annular groove for fitting the seal member into at least one contact surface of the container member,
A fluid sealing device characterized in that when the annular seal member is inserted into the groove, a slight circumferential tension or radial compression is applied to the annular seal member. (2) There are few annular grooves, and there are only two types of groove widths, and the groove width at the 7th rank side is relatively wider than the diameter of the sealing member, and the groove width near the groove bottom is relatively wide. is formed into a stepped annular groove whose width is set to be slightly smaller than the seal member diameter, and an annular seal member having a substantially circular cross section is attached to this 311-shaped groove. Fluid sealing device. (3) lj-shaped groove The fluid according to claim 1, comprising an annular groove having a rectangular groove shape and an annular seal member having an arbitrary cross-sectional shape and having a hem dimension slightly wider than at least the bottom of the groove. Sealing device. (4) The third-shaped groove is separated from an annular groove having a buried rectangular groove shape and an annular seal member having an arbitrary cross-sectional shape and having an inner diameter slightly smaller than the inner diameter of the annular groove. The fluid sealing device according to scope 1.