JP2545995Y2 - Sealing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for sealing an internal or external fluid with an O-ring.

[0002]

2. Description of the Related Art An example of a conventional sealing device for sealing a pressure fluid in a pipe will be described with reference to FIGS.

A flange 1 a of a pipe 1 is fixed to a mating member 4 by a bolt 3 via a division suppressing body 2. That is, the end surface of the flange 1 a of the pipe 1 is in close contact with the mating member 4. The flange 1a is provided with an O-ring groove 1b in which an O-ring for sealing a pressure fluid in the pipe 1 is provided.
Ring 5 is set. Arc-shaped surfaces having the same radius are formed at both corners of the O-ring groove 1b.

FIG. 3 shows SAE Standard J1.
019 shows a standard O-ring groove, with corners A on both sides,
The radius of the arc-shaped surface of B is 0.76 mm, and the groove width W is 4.1 mm. When an internal pressure of 525 kgf / cm ² is applied by the sealing device shown in FIG. 2 having the O-ring groove, a stress concentration of 39.4 kgf / mm ² is generated at the corner A according to FEM analysis. The outer diameter of the O-ring set in the O-ring groove is 3.53 mm
It is.

[0005]

[Problems to be solved by the invention] In the conventional sealing device,
Irrespective of the magnitude of the stress generated by the pressure, the radius of the arc-shaped surfaces of the corner portions A and B on both sides of the O-ring groove 1b is made equal, so that the reliability of the components is reduced due to the stress concentration. Corners A and B on both sides to reduce stress concentration
When both the radiuses of the arc-shaped surfaces are increased, the filling rate of the O-ring increases, and the reliability of the O-ring decreases.

The present invention has been made in view of the above circumstances, and easily reduces stress concentration generated in an O-ring groove.
It is another object of the present invention to provide a sealing device capable of maintaining an O-ring filling rate at an appropriate value.

[0007]

In order to achieve the above object, the present invention provides an O-ring groove in a sealing component body,
In the sealing device in which the O-ring is inserted in the O-ring groove, the radius of the arc-shaped surface at the corner where the stress generated in the O-ring groove is concentrated by pressure is increased, and the opposite corner where the stress is not concentrated is increased. The radius of the arcuate surface at the corner is reduced so as to be substantially the same as the O-ring filling ratio when the radii of the arcuate surfaces at the corners on both sides of the O-ring groove are equal to each other. Features.

[0008]

The radius of the arcuate surface at the corner where stress concentration occurs in the O-ring groove is increased, and the radius of the arcuate surface at the opposite corner where stress concentration does not occur is reduced. Stress concentration is reduced, and the filling rate of the O-ring becomes an appropriate value.

[0009]

FIG. 1 shows an embodiment of the present invention.

The groove width W, depth and diameter of the O-ring groove 1b of this embodiment are the same as those in FIG. The radius of the arc-shaped surface of the corner A on the side where stress concentration occurs is 1.2 mm, and the radius of the arc-shaped surface of the corner B on the opposite side is 0.4 mm.
In this embodiment, when an internal pressure of 525 kgf / cm ² is applied in the same manner as in FIG. 3, according to FEM analysis, the stress concentration at the corner A is 32.1 kgf / mm ² , which is higher than that in FIG. It is reduced by about 20%. Stress concentration at the opposite corner B due to the reduction of the radius of the arc-shaped surface to 0.4 mm is not observed. The outer diameter of the O-ring 5 is the same as that of FIG. 3, and the filling rate of the O-ring 5 is the same as that of FIG.

Although the sealing device in which an internal pressure is applied has been described as an embodiment, the present invention can be applied to a sealing device in which an external pressure is applied.

[0012]

As described above, according to the present invention, the concentration of stress generated in the O-ring groove can be easily alleviated, the reliability of the sealing component can be improved, and the O-ring can be improved. The filling rate can be kept at an appropriate value, and the reliability of the O-ring can be maintained.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view illustrating an example of a conventional sealing device.

FIG. 3 is an enlarged view of an O-ring groove in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 1b O-ring groove A Corner part B Corner part 2 Suppression body 3 Bolt 4 Mating member

Claims (1)

(57) [Scope of request for utility model registration] In a sealing device, an O-ring groove is provided in a sealing component body, and an O-ring is inserted in the O-ring groove.
Increase the radius of the arc-shaped surface at the corner where the stress generated in the O-ring groove due to the pressure is concentrated, and increase the radius of the arc-shaped surface at the opposite corner where the stress is not concentrated on both sides of the O-ring groove. A sealing device characterized in that the filling rate of the O-ring is substantially the same as the filling rate of the O-ring when the radii of the arc-shaped surfaces at the corners are equal to each other.