JPH0731035Y2 - Piping terminal connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field and outline of the invention] The present invention relates to a structure of a connecting portion of a pipe terminal including a connected main body such as a gas cock and a flexible tube. Even if abnormal heating occurs due to a fire or the like, the sealing property of the connecting portion is surely maintained, thereby preventing a gas leakage accident in the event of a fire.

[Prior Art and Problem] In a kitchen or the like, a gas cock is often attached to a wall surface. Recently, a large number of gypsum boards have been used to simplify the structure of the wall surface.

It is difficult to adopt a conventional steel pipe for such a wall surface, and recently, a bellows pipe, that is, a bendable flexible metal pipe is adopted as a gas pipe.

This flexible tube expands the outer peripheral wall of a thin metal tube at regular intervals to make the axial section of the tube wall corrugated,
The outer diameter of the peak portion forming the corrugation is set to be constant.

As such a configuration, specifically, a configuration as shown in FIG. 5 is known.

As shown in the same figure, this conventional one is a contact member that is attached to the back surface of the wall plate (30) and the flange (12) extended from the gas inlet (11) of the gas cock body as the main body (1) to be connected. The gas cock body is fixed to the wall plate (30) by screwing the plate (40) with the bolts (5) and (5), and the flexible metal pipe is connected to the gas cock body through the joint (20). (2) is connected.

The joint (20) includes a joint main body (22), a nut (23), a pair of retainers (S), (S), and a rubber packing (P), and the retainer (S), (S) is in the axial direction. The cross section of the metal tube (2) to match the axial wall cross section,
With the retainers (S), (S) facing each other, the metal pipe (2)
It is externally fitted to the joint main body (22) and is used together with the rubber packing (P).

In this conventional device, the joint (20) and the metal pipe (2) are reliably sealed by the rubber packing (P) interposed therebetween, and the risk of gas leakage can be prevented.

However, in the above-mentioned conventional one, when the rubber packing (P) is heated and melted due to a fire accident or the like, the rubber packing (P) does not perform the sealing function and gas leaks from this portion. was there.

The present invention has been made in view of such a point, and "The end portion of a flexible metal pipe (2) in which annular peaks and annular valleys are alternately and continuously continuous is used as a gas cock or the like. In the pipe terminal connection structure in which the connected main body (1) side is inserted and fixed in the tubular portion (25), even if a fire accident occurs and the above-mentioned connecting portion is heated, the metal pipe (2) and the tubular portion (25 The problem is to reliably prevent gas leakage in the event of a fire by ensuring the sealability of).

[Means] The technical means of the present invention for solving the above-mentioned problem is "the tubular part (25) on the main body (1) to be connected and the metal pipe (2) inside thereof.
A metal seal tube (6) is interposed between the seal tube (6) and a male screw (61) engraved on the outer circumference of the seal tube (6), and the seal tube (6) is provided on the tube portion (25) side. ) Is engraved with a female screw for screwing in the male screw (61) part, and further the inside of the cylinder part (25) corresponds to the tip of the seal cylinder (6) screwed into the cylinder part (25). And forming a tapered surface (63) that shrinks in the screwing direction of the seal tube so that the tip of the seal tube in the final screwed state coincides with the valley of the metal tube (2). The position of the tapered surface (63) and the insertion depth of the metal pipe (2) into the tubular portion (25) are set.

[Operation] The above technical means operates as follows.

With the metal tube (2) inserted through the seal tube (6), the end of the metal tube (2) is inserted into the tube section (25), and in this state, the male screw on the outer circumference of the seal tube (6) is inserted. Screw (61) into the female thread on the side of cylinder (25).

When the seal cylinder (6) is screwed into the cylinder part (25) and the seal cylinder (6) enters the cylinder part (25), the tip of the seal cylinder (6) faces it. In addition, it comes into contact with the taper surface (63) that contracts in the screwing direction of the seal tube (6). When the seal cylinder (6) is further screwed in this state, the tip end of the seal cylinder (6) is strongly pressed against the tapered surface (63) with which the seal cylinder (6) abuts, and the diameter thereof is contracted. The inner peripheral portion of the tip 6) abuts the outer peripheral surface of the metal tube (2) inserted through the inner side thereof to ensure the airtightness of both.

That is, the inner peripheral surface of the tip of the seal cylinder (6) is a taper surface (63) formed on the outer peripheral surface of the metal tube (2) inserted in the seal cylinder (6) and the cylinder part (25). , And the metal pipe (2) is connected to the cylinder portion (25) side in an airtight state via the metal seal cylinder (6).

In particular, the position of the taper surface (63) and the metal pipe (2) to the tubular part (25) are arranged so that the tip of the seal tube in the final screwed state coincides with the valley of the metal tube (2). Since the insertion depth of) was set, in the final screwed state,
Due to the action of the tip of the seal tube being pushed into the tapered surface (63), the tip of the seal tube (6) is slightly pushed into the outer valley of the metal tube (2) and is deformed. Fixed.

[Effect] The present invention has the following unique effects.

The tubular portion (25) and the metal pipe (2) inserted and connected to the tubular portion (25) are connected in an airtight state by the metallic sealing tube (6) interposed therebetween, which causes a fire. Even if the connecting portion is in a high temperature state, there is less concern that the connecting portion will have a poor seal, and a gas leakage accident at the time of the fire can be prevented.

Since the tip of the seal tube (6) is deformed and fixed in a state of being slightly pushed into the valley portion of the outer periphery of the metal tube (2),
The airtightness of the metal seal portion between the seal tube (6), the tapered surface (63) and the crest portion of the metal tube (2) is further improved.

[Embodiment] Next, an embodiment of the present invention described above will be described in detail with reference to the drawings.

In the first embodiment shown in FIGS. 1 to 3, the present invention is applied to the gas inlet (11) of the gas cock body as in the conventional example.

A female screw (21) is formed on the inner circumference of the upstream end of the gas inlet (11), and a cylindrical screw (4) is screwed into the female screw (21). A seal cylinder (6) made of a brass material is screwed into the inner circumference of the upstream end of the cylinder screw (4), and a tightening flange (62) is formed at the upstream end of the seal cylinder (6). ) Is provided, and the downstream end of the seal cylinder (6) is formed on the inner periphery of the cylinder screw (4) near the downstream end and has a tapered surface (63) that shrinks toward the downstream side. It comes to abut.

An intermediate diameter portion (24) and a small diameter portion (26) on the downstream side thereof are formed on the downstream side of the mounting portion of the cylindrical screw (4) in the cylindrical portion (25). An expanded space (29) for accommodating the rubber packing (P) is formed on the downstream side of 26).

The intermediate diameter portion (24) is provided with split rings (3), (3) coaxially located and made of an elastic material such as spring steel. The split rings (3), ( An auxiliary ring (31) is interposed between the auxiliary ring (3) and the auxiliary ring (3).
The inner edges of both ends of 1) are cut to form a taper shape. The inner diameters of the split rings (3), (3) and the auxiliary ring (31) are set to be slightly larger than the outer diameter of the metal pipe (2).

Further, a metal packing (32) is mounted on the small diameter portion (26) located on the downstream side of the mounting portion of the auxiliary ring (31), and a rubber is placed on the expanded space (29) further downstream thereof. Packing (P) is installed.

As shown in FIG. 1, the inner diameters of the split rings (3) and (3) and the metal packing (32) arranged on the downstream side of the split rings (3) can be changed when the tubular screw (4) is loosened. It is slightly larger than the outer diameter of the flexible metal tube (2).

Insert the tip of the metal tube (2) into the tube (25) and press the tip of the metal tube (2) into the rubber packing (P) of the enlarged space (29). When the (4) is screwed in, the split rings (3) and (3) become tapered surfaces (34) and (34) at both ends of the auxiliary ring (31) located between them and the inner circumference of the tip of the cylindrical screw (4). Tapered surface (42) formed on
Furthermore, the inner diameter is contracted by the guiding action of the tapered surface (27) formed at the boundary between the small diameter portion (26) and the intermediate diameter portion (24), whereby the split rings (3) and (3) are made of metal pipe ( 2) Fit in the valleys (2b) and (2b) formed on the outer circumference. Further, the metal packing (32) loaded on the downstream side of the split rings (3), (3) is the split rings (3), (3).
The diameter is contracted by the small diameter portion (26) formed in a tapered shape while being pushed forward by the above, whereby the sealing property between the metal pipe (2) and the tubular portion (25) is secured. As a result, the metal tube (2) and the tubular portion (25) are joined together in a retaining state.

Now, when the seal cylinder (6) is tightened in the above-mentioned coupled state, the tip end portion thereof comes into contact with the taper surface (63) that shrinks toward the tip end formed on the inner circumference of the downstream end of the cylinder screw (4),
When the seal tube (6) is further tightened in this state, the seal tube (6) abutting on the tapered surface (63) of the tube screw (4).
Of the metal pipe (2) is forcibly deformed so as to be pushed into the valley portion side of the metal pipe (2) and comes into airtight contact with the outer peripheral wall of the metal pipe (2), whereby the metal pipe (2) and the tubular portion are (25) is in a state of being metal-sealed via the cylinder screw (4) and the seal cylinder (6).

When a fire or the like occurs and the tubular portion (25) or the like is heated, and the rubber packing (P) that seals the tubular portion (25) and the metal pipe (2) is melted by this, mounting of the rubber packing (P) There is a risk that the gas in the gas inlet (11) will leak out through the section. However, since the inner peripheral surface of the tip of the seal tube (6) is in airtight contact with the outer peripheral wall of the metal tube (2) and is in a metal-sealed state, the gas is blocked by the metal seal portion (60). It does not leak outside. That is, it is possible to prevent a gas leakage accident at the time of a fire.

In addition, in the case of this embodiment, the fire may also be caused by the metal packing (32) that enters into the wedge shape between the tapered small diameter portion (26) formed on the inner circumference of the tubular portion (25) and the metal pipe (2). In addition, the gas leakage is prevented more reliably.

The second embodiment shown in FIG. 4 has a pressing ring (4) including a taper portion (42) formed at the tip of a cylindrical screw (4).
5) is separated from the main body of the cylinder screw and made independent.

In this case, when the tubular screw (4) is screwed into the tubular portion (25) and tightened, the pressing ring (45) is less likely to rotate together with the tubular screw (4). The pressed split ring (3) hardly rotates following the rotation of the cylindrical screw (4). As a result, it is possible to prevent the inner circumference of the split ring (3) from rotating in pressure contact with the outer circumference of the metal tube (2) and reduce the risk of damaging the outer wall of the thin metal tube (2).

[Brief description of drawings]

FIG. 1 is a sectional view of a joint showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a state in which a seal cylinder (6) and a cylinder screw (4) are tightened, FIG. 3 is an exploded perspective view, and FIG. Is an enlarged cross-sectional view of the main part of the second embodiment, and FIG. 5 is an explanatory view of a conventional example. In the figure, (2) ... Metal tube (6) ... Seal tube (25) ... Tube section (61) ... Male Screw (63)… Tapered surface

Claims (1)

[Scope of utility model registration request] 1. A cylindrical portion on the side of a main body (1) to be connected, such as a gas cock, which is provided with a terminal portion of a flexible metal pipe (2) in which annular ridges and annular valleys are alternately and continuously continuous. In a pipe terminal connection structure for inserting and fixing to a (25), a metal seal tube (6) is interposed between a tube part (25) on the connected main body (1) side and a metal tube (2) inside thereof. And a male screw (61) is engraved on the outer periphery of the seal cylinder (6) and the male screw (61) portion of the seal cylinder (6) is screwed into the cylinder portion (25) side. Is further engraved, and further confronts the tip of the seal tube (6) screwed into the tube section (25) and contracts in the screwing direction of the seal tube in the tube section (25). The tapered surface (63) is formed, and the position of the tapered surface (63) and the cylindrical portion are such that the tip of the seal cylinder in the final screwed state is aligned with the valley of the metal pipe (2). Piping terminal connection structure sets the insertion depth of the metal tube to 25) (2).