JPS60188682A - Sleeve type copper pipe joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a g@pipe joint used for transferring refrigerant, fuel, or various gases, and includes both pipe-to-pipe connections and pipe-to-device connections.

Various fitting structures for fittings and steel pipes have been developed over the years, and are classified into ring type sleeve type, biting type, expansion type, etc. However, the sleeve type is preferred because it causes less damage to the steel pipe due to processing or deformation. Are better. However, the sleeve type uses the entire inner surface of a sleeve of a certain length to press and fix the outer periphery of the steel pipe fitted into it, so the problem is that the pressing force is dispersed and the fixation is weak. . On the other hand, the ring type has a strong grip on the steel pipe, but has the disadvantage that the force is localized when tightening the steel pipe, causing unnecessary deformation of the steel pipe.

The present invention solves this problem and has a structure that allows the pressing force on the steel pipe to be maintained substantially constant.

The following description will be given based on the illustrated embodiment.

In Fig. 1, the joint 1 is a kiln in which the body 2, sleeve 8, and nut 4 are different. Symbol 5 indicates the steel pipe to be installed. In addition, in the figure, the left side is set as the front, and the right side is set as the rear.

The body 2 is a tubular body that includes a mounting part 6 for attaching another pipe or equipment, such as a fuel pump of a diesel engine, and a nut mounting part 7 for screwing a nut 4. A copper pipe is located approximately in the center of the inner diameter part. 5. It is provided with a stepped portion 8 that the tip of the step portion 8 comes into contact with. A male thread is carved on the outer periphery of the nut mounting part 7,
Further, the inner edge of the rear end opening of the mounting portion 7 is a sleeve receiving portion 9 having a tapered surface that tapers inward.

The sleeve 8 is a tubular body whose inner diameter is approximately equal to the outer diameter of the steel pipe 5, and is composed of a pressure contact portion 711, a jacket portion 12, and a central groove g18. The pressure contact portion 11 has a tapered surface that matches the tapered surface of the sleeve receiving portion 9 of the body 2 at the front, and a first flange 14 is formed at the rear.
5 is formed. The space between the first flange 14 and the second flange 15 is a central groove 18, which is integrally molded from a solid material. The cross section of the central groove portion 18 is U-shaped.

The nut 4 has a contact step 16 (d1!) at its rear end that engages with the rear surface of the second flange of the sleeve 8.

As shown in FIG. 2, the length of the nut 4 is long enough to fit the sleeve 8 inside and press the pressure contact part 11 against the receiving part 9 of the body 2, and to screw the nut mounting part 7 halfway. It is. At this time, the outer part of the sleeve 3 protrudes rearward from the opening of the nut 4 ◇ The above is the basic configuration of the present invention, and in use, first, the nut 4 and sleeve 8 are attached to a vertically cut steel pipe. After fitting, the steel pipe is inserted into the body 2, and the tip of the steel pipe is brought into contact with the stepped portion 8 of the inner diameter portion. Then, as shown in FIG. 2, the nut 4 is slid together with the sleeve 8, and the nut 4 is screwed onto the nut mounting portion 7 of the body 2.

At this time, as the nut 4 is screwed in, the abutment step 16 presses against the rear surface of the second flange of the sleeve 8 while slidingly rotating.
The sleeve 8 as a whole is urged forward. Therefore, the distal end of the pressure contact part 11 that is in contact with the receiving part 9 of the body 2 is strongly pressed toward the outer periphery of the copper tube 5 by the tapered surface. Therefore, in FIG. 2, when the nut 4 is screwed in one turn or one and a half turns from the state where it has temporarily stopped screwing in, the pressure contact part 11 deforms inward and grips the copper tube 5 reliably.

Further, as the pressure contact portion 11 deforms inward, the friction with the outer periphery of the steel pipe increases, so that the tip of the copper pipe 5 is pressed against the stepped portion 8 as the nut 4 screws forward.

If the nut 4 is further screwed in, the pressure welding part 11 will be excessively deformed and the copper tube 5 will be damaged, but such screwing will be detected by a sudden increase in resistance and stopped. . However, even if excessive screwing and therefore excessive compression of the sleeve occurs, in the case of the present invention, this will be absorbed by the central groove portion 18 within a certain range. That is, the groove 18 has a U-shaped cross section and can be slightly elastically deformed. The elasticity accumulated in the central groove portion 18 also functions to equalize the force with which the pressure contact portion 11 grips the copper tube 5 and to prevent the nut 4 from loosening.

The outer part 12 of the sleeve 8 is made of copper I# near the nut 4.
If 5 is bent at a steep angle, it will prevent vibrations and shaking of the steel pipe during operation of the equipment from reaching the pressure welding part and protect it.

That is, the present invention has both the functions of a ring type joint and a sleeve type joint.

Figures 8-5 illustrate embodiments of the invention.

In FIG. 8, the tapered surfaces of the receiving portion 9 of the body 2 and the pressure contact portion 11 of the sleeve 8 are made into skin-shaped conical surfaces.

According to this shape, when installing the steel pipe, the pressure welding part 11 is
The deformation position is closer to the tip, and the direction to the outer circumferential surface of the copper tube is closer to perpendicular, making it possible to grasp the steel tube more sharply.

FIG. 4 shows a sleeve 8 in which the bottom wall thickness of the groove 18 is slightly thinner than that of the outer mantle 12.
The elastic effect of the central portion 18 is improved.

FIG. 5 is characterized in that the rear surface of the second flange 15 of the sleeve 8 is tapered toward the rear, and the front surface of the abutting stepped portion 16 of the nut 4 is a corresponding tapered surface. In this way, when the pressing force from the nut 4 is transmitted to the sleeve 8, the tapered surface will cause the nut to be small or the sleeve 8 to be
can escape and alleviate this. In combination with the above-mentioned elastic function of the central groove 13, the connection of the steel pipes can be made reliable and durable against loosening.

As described above, the joint of the present invention does not require any processing on the copper pipe to which it is attached (excluding pars at the cut part).
-) It is easy to install, and the installation is strong, there is no risk of leakage, and there is little deformation of the steel pipe.

[Brief explanation of drawings]

Figure 2 is the normal uji when installed. Figure 8 is a front view of a part of another embodiment. Figure 4 is a front view of the sleeve in another embodiment. Figure 5 is a front view of the sleeve in another embodiment. Figure 1...Joint 2...Body 3...Sleeve 4.
... Nut 5 ... Copper tube 6 ... Attachment part to equipment 7
... Nut mounting part 8 ... Step part 9 ... Sleeve receiving part 11 ... Pressure contact part 12 ... Mantle part 13 ... Central groove part 14 ... First flange 1
5... Second flange 16... Contact step portion (10...
(missing number) Figure 1 Figure Z

Claims (4)

[Claims] (1) It consists of a body, a sleeve, and a nut, and the body is a pipe body with a part for attaching to another pipe or equipment and a part for attaching a nut, and has a stepped part on its inner diameter that the tip of the copper pipe comes into contact with. The nut mounting part has a male thread on the outer periphery to be screwed into the nut, and the inner edge of the rear end opening has a sleeve receiving part with a tapered surface that tapers inward. A tube body with an inner diameter approximately equal to the outer diameter of the copper tube, with a first flange at the rear and a press-contact part of a tapered surface that matches the receiving part of the body, and a mantle part with a second flange at the front. The nut has a structure in which a groove is provided and integrally molded, and the nut has an abutting stepped part at the rear end that engages with the rear surface of the second flange of the sleeve, and the nut can also be fitted with a sleeve.
A sleeve-type copper pipe joint characterized by a length that allows it to be screwed to the middle of the nut attachment part of the body. (2) Claim 1, characterized in that the tapered surface of the inner edge of the rear end opening in the body is a secret-shaped conical surface.
Copper pipe fittings listed in section. (3) The central groove between the first flange and the second flange in the sleeve has a U-shaped cross section, and the bottom part is slightly thinner than the outer mantle part.
Copper pipe fittings described in Section 2 or Section 2. (4) Claims 1 to 4 are characterized in that the rear surface of the second flange in the sleeve is a tapered surface that tapers backward, and the front surface of the abutment stepped portion in the nut is configured to correspond to this. Copper pipe fittings listed in any one of Section 8.