JPH11325341A - Joint metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an economical joint metal to replace only a deformed or damaged portion in a seat part to recycle a joint metal body when deformed or damaged. SOLUTION: This joint metal is provided with a joint metal body 1 with a tapered recess 5 formed concentrically to an axial center in an end part of a joint tube part 4 having a male screw part 6 in its outer circumferential face, a seat member 7 with seat parts 9a, 9b comprising tapered protrusions joinable to the tapered recess 5 formed symmetrically in its both end parts, and a flare nut 13 having a female screw part 14 screwed in the male screw 6 of the joint tube 4 from the outside of a flare part 11 by joining the flare part 11 of a flare tube 10 to one seat part 9b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fitting for a high-pressure pipe through which a high-pressure fluid such as a liquid or a gas flows.

[0002]

2. Description of the Related Art Flare type fittings having a simple structure and high sealing performance are used for connecting high-pressure pipes for aircraft, machine tools or refrigerators. In this joint fitting, a joint pipe portion having a sheet portion to be joined to a flare pipe is integrally provided on a joint fitting body having a nut, and a male thread portion is formed in the joint pipe portion.

[0003] A flare nut fitted to the flare portion of the flare tube directly or via a sleeve is screwed into the external thread portion of the joint tube portion and tightened, so that the flare portion is joined to the seat portion, and the joint portion is joined. The fitting and the flare piping are connected.

[0004]

By the way, the tightening torque of the flare nut is within the range specified by the specifications and the like. However, the seat portion is deformed due to an external force applied to the seat portion during handling during use, and the joint bracket is deformed. Frequent attachment and detachment of the pipe with the flare pipe may cause damage, resulting in poor sealing, requiring replacement of the entire fitting with a new one, which is uneconomical.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. It is an object of the present invention to replace a joint body when a seat portion is deformed or damaged, and only the portion is replaced. An object of the present invention is to provide an economical fitting that can be reused.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a joint fitting in which a tapered recess is formed concentrically with an axis at an end of a joint pipe having a threaded portion on an outer peripheral surface. A body member, a sheet member having a symmetrically formed seat portion formed of a tapered projection that can be joined to the tapered recess at both ends, and a state in which one sheet portion of the sheet member is joined to the tapered recess of the fitting body. And a flare nut having a female thread portion which is joined to the flare portion of the flare tube on the other sheet portion, and which is screwed into the external thread portion of the joint pipe portion from outside the flare portion. Fitting fittings.

A second aspect of the present invention is characterized in that the sheet member of the first aspect is made of a synthetic resin. According to the above configuration, when the sheet member is damaged, the joint member main body can be reused simply by removing the sheet member from the joint member main body and replacing the sheet member with a new one.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the entire configuration of the joint fitting, and the joint fitting body 1 is formed of a metal material, for example, iron, stainless steel, aluminum, brass or copper. The joint fitting main body 1 is integrally provided with a joint pipe portion 4 having a through hole 3 concentrically with the axis O at one end in the axial direction. A tapered recess 5 having a reverse taper shape is provided concentrically with the through-hole 3 at the tip end of the joint pipe 4, and a male thread 6 is provided on the outer peripheral surface of the joint pipe 4.

Reference numeral 7 denotes a sheet member which is detachably joined to the tapered recess 5 of the joint fitting body 1, and is formed of a synthetic resin material having excellent oil resistance and heat resistance.
The sheet member 7 has a through hole 8 having the same inner diameter as the through hole 3, and sheet portions 9 a and 9 b composed of tapered convex portions which are tightly joined to the tapered concave portion 5 are provided symmetrically at both ends. Have been.

A flare section 1 is provided at the end of the flare pipe 10.
The sleeve 1 is formed outside the flare portion 11.
2, a flare nut 13 is fitted, and the flare nut 13 is formed with an internal thread portion 14 which is screwed to the external thread portion 6 of the joint tube portion 4.

In the joint fitting thus constructed, the joint fitting main body 1 and the sheet member 7 are separate members, and when the flare pipe 10 is connected to the joint fitting main body 1, the sheet fitting 7
Is joined to the tapered recess 5 of the joint tube 4. Next, the flare portion 11 of the flare tube 10 is joined to the other sheet portion 9b of the sheet member 7. Then, the flare nut 13 is fitted to the joint pipe part 4 via the sleeve 12 fitted to the flare pipe 10, and the female thread part 14 is fitted to the joint pipe part 4.
Screwed into the external thread portion 6.

When the flare nut 13 is tightened, the flare portion 11 is pressed against the seat portion 9a of the seat member 7 via the sleeve 12, and the seat portion 9a is pressed against the tapered recess 5 to be sealed. Is connected to the flare tube 10.

Since the sheet member 7 is made of synthetic resin, it is difficult to make dents or scratches. However, if an external force is applied during handling or the attachment / detachment of the flare tube 10 is repeated, the sheet portion 9 is not made.
Although a and 9b may be deformed or damaged, in such a case, the joint fitting main body 1 can be used as it is by replacing only the sheet member 7 with a new one. Therefore, there is no need to replace the entire joint fitting, and only a part of the fitting is replaced, which is economical. In the above embodiment, the sheet member is made of synthetic resin, but may be formed of the same material as the joint fitting body.

[0014]

As described above, according to the present invention, when the seat portion is deformed or damaged, only the portion is replaced and the joint fitting body can be reused, thereby making it possible to reuse the joint fitting economically. Can be provided.

[Brief description of the drawings]

FIG. 1 is a semi-longitudinal sectional side view of a fitting according to a first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Joint fitting main body 4 ... Joint pipe part 5 ... Taper recess 7 ... Sheet member 9a, 9b ... Sheet part 10 ... Flare tube 11 ... Flare part 13 ... Flare nut

Claims (2)

[Claims] 1. A joint fitting body having a tapered recess formed concentrically with an axis at an end of a joint pipe having a threaded portion on an outer peripheral surface, and a tapered projection which can be joined to the tapered recess at both ends. A sheet member having a symmetrically formed sheet portion, and in a state where one sheet portion of the sheet member is joined to the tapered recess of the joint fitting main body, a flare portion of a flare tube is joined to the other sheet portion; A flare nut having a female threaded portion screwed from the outside of the flare portion to the external thread portion of the joint tube portion. 2. The joint fitting according to claim 1, wherein said sheet member is made of a synthetic resin.