JP2522603Y2 - Pipe fittings - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint, and more particularly to a pipe joint for transporting steam, water, oil, gas, air and the like.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show a conventional pipe joint. The pipe joint 10 has a flare 11 a formed at an end of the pipe 11, a sleeve 12 is fitted to the pipe 11, and the sleeve 12 is screwed into a recess 13 a of the attached body 13, thereby forming the pipe 11. It has a structure to be connected to the attached body 13.

[0003] The pipe 11 thus joined is
As shown in FIG.
Flare 11a is the bottom surface 13 of the concave portion 13a of the attached body 13.
b is pressed into contact with the peripheral surface of the cone-shaped portion 13c formed to seal with the body 13 to be mounted.

[0004]

By the way, in the conventional pipe joint 10 as described above, the processing of the cone-shaped portion 13c formed on the bottom surface 13b of the concave portion 13a of the body 13 to be mounted becomes a complicated operation, and the process is complicated. When the shaft center of the female screw portion 13d in the concave portion 13a of the attached body 13 and the shaft center of the cone-shaped portion 13c are processed in a state of being shifted, as shown in FIG. The portion may not be in contact with the cone-shaped portion 13c.

In such a case, since watertightness cannot be achieved as a pipe joint, the above-mentioned mounted body having a displaced shaft center must be replaced with another mounted body having good machining accuracy. As a matter of course, the conventional pipe joint 10 has problems in terms of workability and water tightness.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional pipe joint, and has as its object the simple structure, and the pipe can always be attached to the object to be attached in a watertight state. It is to provide a pipe joint.

The pipe joint according to the present invention has a concave portion having a fluid passage opened at the bottom surface, the bottom surface of the concave portion is formed flat, and a female thread is formed on the peripheral surface of the concave portion. To the end
Pipe with W flare folded inside and inside the tip
The peripheral surface has a chamfer with the same opening angle as the flare,
It is composed of a sleeve with an external thread formed on the peripheral surface,
The sleeve is fitted to the pipe, the sleeve is screwed into the attached body, and the flare of the pipe is pressed against the bottom surface of the concave portion of the attached body at the end of the sleeve, and the pipe is attached to the attached body. I am trying to install it.

[0008]

In the above-described pipe joint of the present invention, since the bottom surface of the concave portion of the attached body is flat, processing becomes easy, and the entire tip of the flare of the pipe is always in close contact with the bottom surface of the concave portion. It becomes a pipe joint that can obtain a stable watertight state.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 show a pipe joint according to the present invention. The pipe joint includes a pipe 1 to be connected, a sleeve 2, and a valve housing having a mounting portion. And the attached body 3.

The pipe 1 has a flare 1a at a connection end. The flare 1a is a W flare whose end is folded inward.

The sleeve 2 has a male screw 2a formed on the outer peripheral surface of the distal end, and a flare 1 on the inner peripheral surface of the distal end.
A chamfer 2b having an opening angle substantially the same as that of FIG. The outer peripheral surface of the rear end of the sleeve 2 is provided with engaging means 2c for a sleeve tightening tool such as a wrench, in this embodiment, six chamfers.

A recess 3a is formed in the mounting portion of the body 3 to be mounted. The bottom surface 3b of the recess 3a is formed flat, and a fluid passage 3c is opened at the center of the bottom surface 3b. A female screw 3d is formed on the peripheral surface of the concave portion 3a.

In the thus constructed pipe joint according to the present invention, first, the sleeve 2 is fitted into the pipe 1, the sleeve 2 is fitted into the concave portion 3a of the body 3 to be mounted, and the male screw 2a of the sleeve 2 is fitted into the concave portion. 3a is screwed into the female screw 3d.

Next, the sleeve 2 is rotated to a predetermined tightening torque by a wrench or the like, and the flare 1a of the pipe 1 is pressed against the flat bottom surface 3b of the concave portion 3a of the attached body 3 at the tip of the sleeve 2.

In this manner, the sleeve 2 is tightened.
And folded inside the W flare 1a by the tightening force.
The squeezed part is crushed while being pushed outward.
As shown in FIG. 2, the annular surface is the bottom surface 3 of the recess 3a.
Since it is pressed against b, a watertight state is ensured.

The pipe joint according to the present invention having the above structure is applied to a pipe 1 made of low carbon steel, a sleeve 2 made of S15C, and an attached body 3 made of BSBM. 60kgf-cm ~ 150kgf
−50 cm when tightened to the body 3 with a tightening torque of −cm.
Even in the hydraulic test at 0 kgf / cm ^2, no oil leakage occurred at the joint.

Similarly, the above-described pipe joint according to the present invention is applied to a pipe 1 made of low carbon steel, a sleeve 2 and an attached body 3 each made of S15C.
Is tightened to the attached body 3 with a tightening torter of 80 kgf-cm to 180 kgf-cm, and 500 kgf / cm ²
No oil leak occurred in the oil pressure test of the sample.

The embodiments of the present invention have been described above.
The present invention is not limited to the above-described embodiment, and various modifications and changes are possible based on the technical idea of the present invention. In addition to such devices, a connector for connecting pipes to each other may be used.

[0020]

According to the pipe joint according to the present invention described above, the bottom surface of the concave portion of the attached body with which the flared end of the pipe comes into contact is flattened, so that the structure is simple, the processing is easy, and the crushing is performed. The annular surface of the formed flare always and uniformly contacts the bottom surface of the concave portion of the attached body, and the pipe joint can obtain a stable watertight state.

[Brief description of the drawings]

FIG. 1 is an exploded cross-sectional view of a pipe joint according to the present invention.

FIG. 2 is a sectional view showing an assembled state of the pipe joint according to the present invention.

FIG. 3 is an exploded cross-sectional view of a conventional pipe joint.

FIG. 4 is a sectional view showing an assembled state of a conventional pipe joint.

FIG. 5 is a cross-sectional view showing an assembled state when a processing error occurs in a conventional pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 1a Flare 2 Sleeve 2a Male screw 2b Chamfer 2c Engaging means 3 Attached body 3a Depression 3b Bottom surface 3c Fluid passage 3d Female screw

Claims (1)

(57) [Scope of request for utility model registration] A concave portion having a fluid channel opened at a bottom surface;
The bottom surface of the concave portion was formed flat, an attached body having a female screw formed on the peripheral surface of the concave portion, and the end portion was folded inward at the connection end .
Pipe with W flare and the above flare on the inner surface of the tip
It has a chamfer with substantially the same opening angle, and is constituted by a sleeve having a male thread formed on the peripheral surface.The sleeve is fitted to the pipe, the sleeve is screwed to the body to be attached, and the tip of the sleeve is A pipe joint, wherein a flare of the pipe is brought into pressure contact with a bottom surface of a concave portion of the attached body to attach the pipe to the attached body.