JPH078944Y2 - Seal material for pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a resin-lined packing type joint, in particular, a sealing material used for sealing a mechanical pipe joint and a pipe body connected thereto. .

<Prior Art> Waterproofing or corrosion protection of a connecting portion between a pipe for transporting a fluid such as gas and liquid and a joint pipe for connecting the pipes to each other is performed by winding the outside of this portion in a spiral shape with a tape, A method of covering with a heat-shrinkable tube and heat-shrinking, or a method of tightening a rubber packing or an O-ring with a nut screwed to a connecting portion has been adopted.

<Problems of the Prior Art and Means for Solving the Problems> However, many recent tubes have a lining layer formed of a synthetic resin or the like on the surface of the steel tube for the purpose of corrosion protection.
Mechanical joints are often used as joints, and conventional tape wrapping and coating of heat shrinkable tubes have been performed as corrosion protection methods, but these coatings are poor in workability and satisfactory results are not currently obtained. Is.

On the other hand, as a watertight method between the resin-lined packing type joint and the pipe body, there is a method of sealing with the packing inside the pipe joint, but there are problems such as very bending and insufficient watertightness when pulled. It was

The present invention has been made to solve these problems in the related art. A flexible rubber or plastic material that is deformed by pressure is used to form an annular molded body having a substantially U-shaped cross section. While filling the semi-fluid sealing material in the annular hollow portion of the body, the annular opening portion of the annular molded body is closed by a rupturable or peelable seal, and a collar portion is formed on the outer peripheral portion of the annular molded body. It was adopted.

The sealing material of the present invention is incorporated between the pipe joint and the tightening ring, and the tightening ring screwed into the pipe joint deforms the molded body under pressure to extrude the sealing material to form a gap between the tightening ring and the pipe body. A sealing material for pipe fittings that closes and seals a hollow ring-shaped molded body, and in particular, a part of the ring-shaped molded body is formed in a horseshoe-shaped open portion of an adjacent lock ring when a tightening ring is screwed because the collar has a collar portion. It is an object of the present invention to provide a sealing material for pipe joints, which prevents press-fitting and uniformly presses against the lock ring so that the sealing material can be extruded uniformly during tightening and the sealing effect is sufficient. is there.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS.
It will be described with reference to the drawings.

The tightening ring D of the present invention is one in which an inner thread 3 is engraved on the inner circumference of the expanded diameter portion 2 having the inner circumference of the tip as an inclined surface 1, and a synthetic resin lining layer 4 is formed on the entire outer circumference. D
Is extrapolated to the tubular body C. Further, an annular molded body B made of a flexible rubber or plastic material which is deformed by pressure is applied.
Is filled with a semi-fluid sealing material 5 in its peripheral hollow portion and has a collar portion 6, and the opening portion 7 is sealed with a thin film 8 made of a resin or rubber emulsion, and the opening portion 7 is connected to the ring D side. Extrapolate so that Subsequently, a lock ring 9 having a substantially horseshoe shape and a plurality of engaging projections on the inner peripheral surface thereof, a pressing ring 10 made of hard rubber or plastic, and an annular packing 11 having a substantially trapezoidal cross section made of rubber or the like, respectively. Extrapolate to tube C.

On the other hand, the pipe joint A has an enlarged diameter portion 12 that holds the annular packing 11, and an outer screw 13 that engages with the inner screw 3 of the tightening ring D is engraved on the outer peripheral portion.

In the pipe joint A thus constructed, the tightening ring D, the annular molded body B, the lock ring 9, the holding ring 10, the annular packing 11 and the like are externally inserted into the pipe body C as described above.
It is inserted into the pipe joint A as shown.

Next, as shown in FIG. 2, the ring packing 11 is threadedly connected to the tightening pipe D and the pipe joint A, so that the annular packing 11 is closed.
It is press-fitted and tightly fitted into the expanded diameter portion 11 to obtain a sealing effect on the fluid flowing through the pipe C, and the horseshoe-shaped lock ring 9
When the tightening ring D is tightened, it is deformed into a substantially circular shape, and the engaging projection bites into the lining layer of the tube C to securely fix the tube C. In this case, the collar 6 of the annular molded body B
Since the collar 6 is provided, the collar 6 prevents the horseshoe-shaped opening 14 of the lock ring 9 shown in FIG. Therefore, the ring-shaped molded body B is gradually expanded by sequentially tightening the tightening ring D, and
It is uniformly pressed by the inner inclined surface 1 to be deformed, and as shown in FIG. 2, the sealing material 5 filled in the peripheral hollow portion is pushed out through the opening portion 7 by a required amount, and the inside of the gap between the ring D and the tubular body C is pushed. The gap is closed by filling the gap to prevent the lock ring 9 from being corroded.

In the above, the annular molded body B is made of a flexible rubber or a plastic material that is deformed by pressure. As an example, rubbers such as butyl rubber and ethylene propylene rubber, or polyvinyl chloride resin ( Plasticizer content 5 to 50 parts by weight), polyethylene resin, polypropylene resin, polyester resin and the like. As the shape of the ring-shaped molded body B, the ring-shaped molded body has a storage portion for the sealing material 5 having a substantially U-shaped cross section at the peripheral edge, and the collar 6 is integrally or separately provided on the peripheral edge (a ring plate is attached). It is not particularly limited as long as it is provided in (1), but, for example, as shown in FIG. 4A, a seal 8 made of an emulsion film is provided on the opening 7 and is peeled off at the time of use or is externally attached as it is. The fastening ring D may be broken by being pressed. FIG. 3 (b) shows that a cut or groove 15 is provided on the outer peripheral wall surface of the annular molded body B so that wrinkles are not formed on the outer peripheral wall surface of the annular molded body B when pressure is applied by the ring D.

As the sealing material 5, a butyl rubber-based, silicone rubber-based, polyurethane-based or polysulfite-based sealing agent composition is used, and preferably 1 × 10 5.
Those having a viscosity of ² to 1 × 10 ⁵ (at 20 ° C.) poise are preferable.

<Effect> According to the present invention, in the gap between the tightening ring D and the ring body C, since the metal portion of the ring mouth is closed and sealed by the sealing material 5 pushed out by tightening, the lock ring 9 and the like are corroded. Moreover, since the collar 6 is provided on the annular molded body B, the sealing material 5 can be uniformly pressed by the collar 6, the sealing effect can be enhanced, and the work can be performed easily and quickly. It has characteristics.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a state in which the present invention is implemented,
The figure is a vertical cross-sectional view showing the state after implementation, and Fig. 3 is II of Fig. 1.
A sectional view taken along the line I-III and FIGS. 4A and 4B are longitudinal sectional views showing another embodiment of the annular molded body. B ... Annular molded body, 5 ... Sealing material, 6 ... Collar part

Claims (1)

[Scope of utility model registration request] 1. A flexible rubber or plastic material that is deformed by pressure is used to form an annular molded body having a substantially U-shaped cross section, and a semi-fluid sealing material is filled in the annular hollow portion of the annular molded body. At the same time, a sealing material for pipe joints, in which the annular opening of the annular molded body is closed with a rupturable or peelable seal, and a flange is formed on the outer peripheral portion of the annular molded body.