JPH0565983A - Seal coupling device - Google Patents

Abstract

PURPOSE:To provide a seal coupling device which eliminates any partial bump of a gasket attributable to the spillage of a sealing point, and no fear of falling this gasket off. CONSTITUTION:A ring recess 12 is installed in at least either surface of both end faces of a body 2 and a sleeve 1. A first ring projection 13 and a second ring projection 14 are formed on both inner and outer circumferences of the ring recess 12 at this end face. When a seal coupling is constituted, a ring elastic retainer 15 holding a gasket G on the inner circumferential surface is fitted in the first ring projection 13 in utilizing its elasticity, and since screwing between a female nut 3 and the body 2 takes place, the gasket G will in no case fall off at time of installation. With the nut 3 clamped tight, the gasket G is compressed and tries to expand diametrically, but the elastic retainer 15 is also expanding diametrically so as to fill up a gap with the second ring projection 14, thus any slippage in sealing point is not produced at all.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal joint for sealing a body and a sleeve using a gasket, and more particularly to a seal joint device having a gasket holding mechanism.

[0002]

2. Description of the Related Art Conventionally, when connecting pipes to each other, if the pipes are relatively small, a means for connecting the pipes with each other using a female nut is adopted.

FIG. 4 shows a seal joint (A) in which a gasket (G) is interposed in the middle and a sleeve (1) and a body (2) are connected by a female nut (3). The pipe portion (5) of the sleeve (1) is inserted into the head through hole (4) of the female nut (3), and the flange portion (6) of the sleeve (1) is retained via the thrust bearing (B). ing

In the female nut (3), a body (2) having a male screw portion (19) on its peripheral surface is screwed into a female screw portion (18) cut in the female nut (3). There is.

In the female nut (3), the end surface of the sleeve (1) and the end surface of the body (2) are opposed to each other, and an annular step (7) is formed on the end surface of the sleeve (1) to form the body (2). The end surface of () is an annular projection (8) which can be fitted into the annular step (7) of the sleeve (1) with some play.
Is projected. The gasket (G) has its outer periphery held by the inner peripheral surface (9) of the annular protrusion (8),
It is installed between the end surface of the body (2) and the end surface of the sleeve (1).

In FIG. 4, both through holes (10) and (11) are aligned, the female nut (3) is rotated in the tightening direction, a tightening force is applied, and the end surface of the sleeve (1) and the body (2) are applied.
The state where the gasket (G) is squeezed by the end faces of the two and the two are sealed is shown. When tightening the female nut (3), the sleeve (1) tries to rotate together with the female nut (3), but since the thrust bearing (B) is interposed, the rotational force is not transmitted to the collar portion (6), Only pressing force is applied and co-rotation is prevented.

[0007]

However, in the above-mentioned conventional gasket (G) holding mechanism, when the gasket (G) is replaced and repaired, the female nut (3) is used.
When the gasket (G) is removed from the body (2) by removing it, the once compressed gasket (G) may be caught in the inner peripheral surface (9) of the annular convex portion (8) and may not come off. Therefore, the inner diameter of the annular convex portion (8) is usually designed to be slightly larger than the outer diameter of the gasket (G). Therefore, when the seal joint is configured as described above, the vertically lower portion of the gasket (G) is always brought into contact with the inner peripheral surface (9) of the annular convex portion (8) located therebelow due to gravity, and one-sided contact The female nut (3) will be tightened in the state. At this time, the gasket (G) is squeezed together with the tightening of the female nut (3),
The outer diameter of the outer peripheral part expands to the outside, but the vertical lower part cannot be expanded any more because it is a single contact, and the gasket (G) and sleeve (1) once determined before tightening the female nut (3).
Also, the sealing point on the end face of the body (2) causes an inward displacement, which also causes gas leakage when using high-pressure gas or the like. Further, since there is a play between the gasket and the annular step portion (7), the gasket may drop when the joint is assembled, so that it is necessary to pay sufficient attention to the mounting of the female nut and the body. .. An object of the present invention is to provide a seal joint device that eliminates the uneven contact of the gasket that causes the shift of the seal point and that does not cause the gasket to drop.

[0008]

In order to achieve the above object, the seal joint device of the present invention has a gasket between the end surface of a body having a male screw portion on the peripheral surface and the end surface of a sleeve having a brim portion. Via a female screw portion of the female nut and a male screw portion of the body for sealing between the body and the sleeve, at least one of the end face of the body and the end face of the sleeve is annular. A recess is cut, and a first annular protrusion and a second annular protrusion are formed on the inner and outer circumferences of the annular recess, and an annular elastic retainer holding a gasket on the inner peripheral surface is provided on the second annular protrusion. It is characterized in that the first annular convex portion is fitted so as to have a gap between and.

[0009]

Since the annular recess is formed in at least one of the end face of the body and the end face of the sleeve, the first annular protrusion and the second annular protrusion are formed on the inner and outer circumferences of the annular recess on the end face. Has been done. When constructing a seal joint, an annular elastic retainer holding a gasket on the inner peripheral surface is fitted to the first annular convex portion by utilizing the elasticity, and the female nut and the body are screwed together. Does not fall when installed. Further, the gasket is squeezed by the tightening of the female nut to try to expand the diameter, but the elastic retainer also expands the diameter so as to fill the gap with the second annular convex portion, and the shift of the sealing point does not occur.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a seal joint (A) device, which includes a stainless steel sleeve (1) and a body (2).
The structure of the seal joint portion, which is connected using a female nut (3) made of stainless steel, is shown. The main points are the same as those of the conventional one shown in FIG. 4 except for the seal portion, and only the differences will be described here.

As shown in FIG. 1, a female nut (3)
The flange (6) of the sleeve (1) housed inside is provided with an annular recess (12) at approximately the center of the end face thereof, so that a first annular protrusion is formed on the inner and outer peripheral parts of the end face. Department (1
3) and the second annular protrusion (14) are left. Similarly, an annular concave portion (12) is also cut on the end surface of the body (2) facing the brim (6) portion, and the first annular convex portion ( 13)
And the second annular protrusion (14) is left.

An elastic retainer (1) is provided in the annular recess (12).
5) is fitted so as to surround the first annular protrusion (13), and the shape of the elastic retainer (15) is annular as shown in FIG. The elastic retainer (15) is a cylindrical body made of metal, for example, a stainless alloy, and the notch grooves (16) are alternately formed deeper. The elastic retainer (15) is not limited to this embodiment as long as the metal tube having an appropriate thickness can elastically expand and contract inward and outward.

An inner peripheral groove (17) is formed on the inner peripheral surface of the elastic retainer (15), and a gasket (G) is fitted in the inner peripheral groove (17). Here the inner groove (17)
Although the gasket (G) is held by, the minute protrusions are not limited to the grooves and are projected on the inner peripheral surface, or a step is formed on the inner peripheral surface to hold the gasket (G). May be.

In order to improve the durability of the gasket (G) and match the thermal expansion dimension with each other, it is more effective to use a metal tube in which a metal coil spring is inserted.
With the sleeve (1) inserted in the head through hole (4) of the female nut (3), the elastic retainer (15) holding the gasket (G) on the inner peripheral surface is attached to the end surface of the body (2). 1 The annular convex portion (13) is fitted by utilizing the elasticity of the elastic retainer (15), and the female screw portion (1) of the female nut (3) is inserted.
8) and the male screw part (19) of the body (2) are screwed together. Therefore, there is no risk of the gasket (G) falling off during assembly.

Before the gasket (G) is squeezed as shown in FIG. 1, the annular recess (12) of the body (2).
A gap is formed between at least one of the annular recess (12) of the sleeve (1) and the elastic retainer (15), and the elastic retainer (15) and the second annular protrusion (14) are separated from each other. There is a gap between them. When the gasket (G) is squeezed by tightening the female nut (3) in this state, the gasket (G) is deformed into an elliptical cross-section as shown in FIG. 2, and the elastic retainer (15) is expanded by the diameter corresponding to the deformation.
Of the second annular projection (1
Contact up to 4). Almost at the same time when the elastic retainer (15) contacts the second annular convex portion (14), the elastic retainer (1
The gap between 5) and the annular recess (12) disappears.

Here, the elastic retainer (15) can be elastically moved in the radial expansion / reduction direction, but cannot be moved in the circumferential axis direction, so the axial movement is stopped here. The seal joint shown in FIGS. 1 and 2 has a sleeve (1) and a body (2).
An annular recess (12) is formed in the sleeve (1)
The annular recess (12) only in the body or only in the body (2)
May be formed, and before the gasket (G) is compressed, at least one of the annular recess (12) of the body (2) and the annular recess (12) of the sleeve (1) and the elastic retainer (15). ), A gap is formed between the elastic retainer (15) and the second annular protrusion (14).
It suffices to satisfy the condition that there is a gap between and.

If such an elastic retainer (15) is used, the gasket (G) can be brought very close to the through holes (10) and (11), the fluid resistance can be reduced as much as possible, and the gasket can be reduced. The ring diameter of (G) can be made almost the same as that of the through holes (10) and (11), which leads to reduction of material cost.

[0018]

The present invention has the following effects. (A) When configuring a seal joint, an annular elastic retainer holding a gasket on the inner peripheral surface is fitted to the first annular convex portion by utilizing its elasticity, and the female nut and the body are screwed together. As a result, the gasket will not drop during installation. (B) By tightening the female nut, the gasket is squeezed to try to expand the diameter, but the elastic retainer also expands the diameter so as to fill the gap with the second annular convex portion, so that the deviation of the sealing point does not occur. (C) The through holes of the gasket can be made extremely close to each other, and the fluid resistance can be reduced as much as possible.

[Brief description of drawings]

FIG. 1 is a partial side sectional view before gasket compression in an embodiment of the present invention.

FIG. 2 is a partial side cross-sectional view after the gasket is squeezed in the actual case of the present invention.

FIG. 3 is a perspective view of an elastic retainer and a gasket.

FIG. 4 is a partial side sectional view of a conventional seal joint device.

[Explanation of symbols]

 (A) Seal joint (B) Thrust bearing (G) Gasket (1) Sleeve (2) Body (3) Female nut (4) Head through hole (5) Pipe (6) Flange (10) Through hole (11) ) Through hole (12) Annular concave part (13) First annular convex part (14) Second annular convex part (15) Elastic retainer (16) Notch groove (17) Inner peripheral groove (18) Female screw part (19) Male Screw part

Claims (1)

[Claims] A body is formed by interposing a gasket between an end surface of a body having a male screw portion on its peripheral surface and an end surface of a sleeve having a brim portion, and by screwing the female screw portion of the female nut and the male screw portion of the body. In a seal joint adapted to seal between sleeves, at least one of the end surface of the body and the end surface of the sleeve is provided with an annular recess, and a first annular projection and a first annular projection are provided on the inner and outer circumferences of the annular recess. (2) A ring-shaped elastic retainer that forms a ring-shaped convex portion and holds a gasket on its inner peripheral surface is fitted into the first ring-shaped convex portion so that there is a gap between the ring-shaped elastic retainer and the second ring-shaped convex portion. Characteristic seal joint device.