JPS62274164A - Sealing device - Google Patents

Abstract

PURPOSE:To improve the assembly performance and close adhesiveness of a sealing member and prolong the service life of a sealing device by forming the sectional surface of the sealing member of a joint part consisting of two members into a special form having two lips opened into V-figure form. CONSTITUTION:On a sealing member 11 installed into the annular recessed part on one fitting member of the joint part consisting of two members, two pieces of lips 12 and 12 opened into V-figure form, pressure receiving part Wa for fluid or gas, pressure receiving part Wb in the horizontal plane, and a lip 13 in circular projection form which serves also as pressure receiving part are formed. Since the compression force applied onto the sealing body as shown by the arrow by the mutual action of the pressure receiving parts Wa and Wb and the lip 13 is concentrated onto the lips 12 and 12, the sealing performance of the seal is improved. Further, the longest distance A between the outer surfaces of the lips 12 and 12 is smaller than the distance B between the pressure receiving parts Wa and Wb, the lip 12 is prevented from being bitten into each gap Ca, Cb, even if the sealing member 11 is compressed. Further, even if the top edge of the lip 12 is worn out a little, the pressure distribution state can be kept, and the service life of the seal can be prolonged.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) This invention relates to a fitting part of fluid or gas piping, or
This invention relates to a sealing device installed between irons that move relative to each other in the axial direction.

(Prior Art) Conventionally, U pa-knocking, X-rings, and O-rings have been widely used.

(Problems to be Solved by the Invention) Conventional sealing devices all have drawbacks in terms of ease of assembly, sliding resistance, rotational resistance, etc.

In order to solve the above-mentioned drawbacks of the conventional sealing device, this invention
It is an object of the present invention to provide a sealing device that is easy to assemble, has improved sealing performance, and has a long life.

(Means for solving the problem) In a sealing device formed of a rubber-like elastic body that is attached to an annular recess provided in one of the fitting members in a fitting portion of two members, the cross-sectional shape of the sealing device is are symmetrical with respect to the center vertical line, and have two lips that open in a V-shape to the sliding surface or the surface of the anti-seal mounting member, and are designed to prevent the seal from being exposed to high pressure between the inner walls of the enclosing recess for seal mounting. A pressure-receiving part is provided, and a lip-cum-pressure-receiving part in the shape of an arcuate protrusion is provided at the center of the mounting surface, and stress is applied to the V-shaped lip by the interaction between the pressure-receiving part and the lip-receiving part in the shape of an arcuate protrusion at the time of high pressure load. In order to prevent the V-shaped lip from getting caught in the slight gap between the two parts, the longest width on the outer surface of the two lips is shorter than the longest width on both sides of the seal. Set.

(Example) The details of this invention will be explained based on the drawings.

The solid line in FIG. 1 shows the free state of the sealing device according to the invention, and the two-dot chain line shows the seal mounting annular recess and the sliding member or anti-seal mounting member.

11 is a seal, which shows the cross-sectional shape and has a cross-sectional symmetry axis O.
It has two lips 12 that are symmetrical with respect to each other and open in a V-shape. However, in FIG. 1, it is displayed in an inverted black square shape. In order that the width of the lip 12 becomes narrower toward the tip, an angle a is set on the inner side of the lip 12 (an angle a is set on the outer slope, and an angle s is set on the outer slope in FIG. 1).
Angles a and b are between 10° and 25° in an ideal embodiment.
Set to °. <*z mouth external light) The shape of the tip of the lip 12 is la as shown in FIG.
, F, lb, lc, and ld, and in the figure, 1a is a substantially horizontal contact surface, F is a curved surface with curvature R, 1b is a vertical surface rising from curved surface F, and IC is continuous to the upper end of vertical surface 1b. The horizontal surface 1d is a vertical surface rising from the end of the horizontal surface 1c, and the upper end of the vertical surface 1d is continuous with the outwardly inclined surface.

The radius of the tip F portion of the lip 12 is preferably 0.1 to 0.15R, and the contact surface 1a is preferably 0.4 to 0.5 mm.

Vertical plane pressure receiving portions Wa are provided at the ends above the lip 12 on both sides of the seal. This is a fluid or gas pressure receiver.

In FIG. 1, the upper surface of the seal 11 is a seal mounting surface, and has a substantially horizontal pressure receiving portion wb and a lip/pressure receiving portion 13 having an arcuate protrusion shape in cross section.

Thus, the lip/pressure receiving part 13 is made higher than the pressure receiving part wb by the height H.

The interaction between the flat pressure receiving portions Wa at both ends of the seal and the shape of the seal mounting surface causes the compressive force applied to the seal body to be concentrated on the V-shaped lip 12 as shown by the arrow in FIG. Has a function.

The longest distance A between the outer surfaces of the two lips 12.12 and the distance B between the two plane pressure receiving parts Wa and Wa are assumed to be A<B.

The embodiment shown in FIG. 4 has a rod 2V. 2
2 shows the lip 12 mounted radially outward.

14 is a recess provided in the fitting member.

(Function and Effect) The shape of the tip of the lip is such that the mating part of the molding die is 1 d with the IC.
If provided at the intersection P of the P part, it will prevent the adverse effect on the sealing effect due to the pars generated at the P part, and if the lip is about to curl up when inserting the fitting member, the P part will prevent the entire lip from curling up ( Prevent this from happening.

The R of the tip of the lip and the contact surface 1a improve the surface roughness of the mold, and the pressure distribution is curved toward the side opposite to the object to be sealed, as shown in Figure 3, and is concentrated near the F section on both sides of the seal. The interaction between the flat portion Wa and the shape of the seal mounting surface causes the compressive force applied to the seal body to be concentrated on the V-shaped lip 12 as shown by the arrow in FIG.

The distance A between the two lips 12.12 and the two flat parts Wa,
The distance B between Wa and A<B is set to prevent the tip of the lip 12 from being caught in the slight gap Ca%Cb between the two members.

In addition, due to the tip shape of the lip 12, even if the tip of the lip wears out, it is possible to maintain the above-mentioned pressure distribution and deafness, and the back pressure prevents infiltration, leakage, etc. of the object to be sealed. Also, is there small dust or foreign matter on the contact surface of the tip of the lip? This prevents one person from doing so and significantly improves the life of the seal.

In other words, the sealing device according to the present invention has excellent effects such as easy installation, high sealing function, and long life.

[Brief explanation of the drawing]

What is shown in the drawings shows an embodiment of the present invention, and FIGS. 1 and 4 are sectional views of the main parts, FIG. 2 is a detailed sectional view of the main parts of the tip of the lip, and FIG. 3 is a detailed sectional view of the tip of the lip. FIG. 11... Seal 12... Lip 13... Lip and pressure receiving part 14... Recess Wa... Pressure receiving part
wb...Pressure receiving part Ca, Cb...Gap H...Height 1a...Contact surface 1b...Vertical surface 1c...Horizontal surface 1d...Vertical surface F......Curved surface

Claims (1)

[Scope of Claims] 1. A seal device formed of a rubber-like elastic body that is attached to an annular recess provided in one of the fitting members in a fitting portion of two members, the cross-sectional shape of which is It is symmetrical with respect to the center vertical line, and has two lips that open in a V shape with respect to the sliding surface or the anti-seal mounting member surface,
A pressure receiving part is provided between the inner walls of the annular recess for seal installation when a high pressure is loaded, and a lip and pressure receiving part in the shape of an arc protrusion is provided at the center of the mounting surface. A sealing device characterized in that stress is concentrated on the V-shaped lip due to interaction with the lip-cum-pressure-receiving part. 2. A patent claim characterized in that in order to prevent the V-shaped lip from getting caught in the slight gap between the two members, the longest external width of the two lips in cross-sectional shape is set shorter than the longest width of the seal. The sealing device according to item 1.