JPH0336795Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to improvements in pipe joints for flexible pipes (hereinafter referred to as flexible pipes) used particularly for gas and water piping.

(Prior art) As a conventional pipe fitting of this type,
There is one shown in Publication No. 73193.

As shown in FIG. 3, the conventional pipe joint includes a joint main body 1, a cap nut 2, a retainer 3, and a gasket 4, and a male thread portion 5 that is screwed into the joint main body 1 and a female thread portion 6 of the cap nut 2. and retainer 3
A corrugated shape 7 that engages with the outer peripheral corrugated shape of the flexible pipe 9 is formed on the inner circumferential surface of the retainer 3, and a thick flange portion 8 is integrally formed on the rear end side of the retainer 3.

When actually connecting the flexible tube 9, the cap nut 2 is externally fitted onto the end of the flexible tube 9, and at the same time, the inner circumferential waveform 7 of the retainer 3 and the outer circumferential waveform of the flexible tube 9 are engaged. Then, after fitting the retainer 3 onto the flexible pipe 9 in the same way, the gasket 4 is interposed between the end face of the flexible pipe 9 and the pipe receiving wall portion 1a of the joint body 1, and the male screw portion 5 of the joint body 1 is inserted. When the cap nut 2 is rotated in a predetermined direction while screwing together the female screw portion 6 of the cap nut 2, the cap nut 2 presses the rear end flange portion 8 of the retainer 3 with its base 2a and connects the joint. They are sequentially tightened to the main body 1.

Then, as the cap nut 2 rotates, the flexible tube 9 is also pressed in the same direction via the retainer 3.
Compress the end portion 9a as shown in the figure to seal the gasket 4.
Since the flexible pipe 9 is brought into close contact with the joint body 1, the flexible pipe 9 is thereby connected to the joint body 1.

(Problem to be solved by the invention) However, in the case of a conventional pipe joint, a male screw portion 5 is formed on the side of the joint body 1, and the retainer 3 is inserted into the inside of the male screw portion 5 to tighten the cap nut. 2 base 2a
Since the structure is such that the rear end flange portion 8 of the retainer 3 is pressed, when an attempt is made to connect the flexible pipe 9 to the joint body 1 by rotating the cap nut 2, as the cap nut 2 rotates, The rear end flange portion 8 is strongly pressed by the base portion 2a of the cap nut 2, causing distortion such as deformation in the thin wall portion of the retainer 3 that continues from the flange portion 8, and especially the inner periphery of the retainer 3 and the flexible tube 9. Frictional resistance increases unnecessarily between the contact surface with the outer periphery and the contact surface between the rear end flange portion 8 of the retainer 3 and the base portion 2a of the cap nut 2. This caused a major problem in that the sealing performance deteriorated as the seals rotated together.

(Means for Solving the Problems) The present invention was developed to effectively solve the problems of conventional pipe joints, and includes at least a corrugated shape on the joint body, cap nut, and inner periphery. A pipe joint having a structure in which a flexible pipe exhibiting an outer frequency wave shape is connected to the joint body by forming a male thread part on the joint body to be screwed with a female thread part of a cap nut, A protrusion is formed on the inner wall surface of the male thread, and a lock part that engages with the protrusion is formed on the retainer, and the lock part is a divided cavity of the retainer.

(Function) Accordingly, in the present invention, when the cap nut is tightened and rotated, the lock portion formed on the retainer,
Since it reliably engages with the protrusion formed on the inner wall surface of the male thread of the joint body, when the cap nut is rotated,
Even if the retainer were to rotate together with the flexible pipe, the above-mentioned engagement completely prevents the retainer from rotating together with the flexible pipe, and there is no fear that the sealing performance would deteriorate as in the prior art.

(Embodiment) Hereinafter, the present invention will be described in detail based on an illustrative embodiment.As shown in FIG. 14, and a male screw portion 1 that is screwed into the joint body 11 with the female screw portion 16 of the cap nut 12.
5, a waveform 17 is formed on the inner peripheral surface of the retainer 13 to engage with the outer peripheral waveform of the flexible pipe, and a thick flange 18 is integrally formed on the rear end side of the retainer 3. However, its distinctive feature lies in the following configuration.

That is, in this embodiment, the joint body 11
Two convex protrusions 19 are formed on the opposing inner wall surfaces of the male threaded portion 15, and the retainer 13 is configured in a split type in which it is divided into two in the longitudinal direction, and the opposing divided spaces of the retainer 13 are divided into two parts in the longitudinal direction. The above protrusion 19
Each protrusion 19 serves as a locking portion 20 that engages with the
By engaging the lock portion 20 from both sides,
The retainer 13 is configured to be reliably positioned and locked within the male threaded portion 15 of the joint body 11.

Therefore, when connecting the flexible pipe 21 to the joint body 11 using a pipe joint with such a configuration, first, the cap nut 12 is fitted onto the end of the flexible pipe 21, and at the same time, the corrugated shape 17 of the retainer 13 is and flexible tube 2
1, and after fitting the split type retainer 3 onto the flexible pipe 21 in the same way, a gasket 14 is interposed between the end face of the flexible pipe 21 and the pipe receiving wall 11a of the joint body 11. Then, when the cap nut 12 is rotated in a predetermined direction while screwing together the male thread portion 15 of the joint body 11 and the female thread portion 16 of the cap nut 12, the cap nut 12 is attached to the rear of the retainer 13 with its base 12a. While pressing the end flange portion 18, it is sequentially tightened to the joint body 1.

When the cap nut 12 is rotated, each lock portion 20 formed in the divided space of the split type retainer 13 engages with a protrusion 19 formed on the male screw portion 15 of the joint body 11, respectively. Since they fit together, they are guided straight inside the joint main body 11 without rotating together.

Then, as the cap nut 12 rotates, the flexible tube 21 is also pressed in the same direction via the retainer 13, compressing the end 21a as shown in the figure and bringing it into close contact with the gasket 14. As shown in the figure, the flexible pipe 21 can be easily and reliably connected to the joint body 11.

In connection with such a connection, since this embodiment is based on the conventional structure described above, as the cap nut 12 rotates, the rear end flange portion 18 is connected to the cap nut 12.
is strongly pressed by the base 12a of the flange portion 1.
Distortion such as deformation occurs in the thin walled portion of the retainer 13 continuing from 8, especially the contact surface between the inner periphery of the retainer 13 and the outer periphery of the flexible tube 21, the rear end flange portion 18 of the retainer 13, and the base of the cap nut 12. It cannot be denied that the frictional resistance increases between the contact surfaces of 12a.

However, in this embodiment, the two lock portions 20 formed in the divided spaces of the retainer 13 are securely engaged with the convex projections 19 formed on the male screw portion 15 of the joint body 11. Therefore, even if the retainer 13 tries to rotate together with the flexible pipe 21 due to the increase in frictional resistance, the retainer 13 is completely locked and will not rotate together.

Therefore, it is completely possible to prevent the flexible tube 21 from rotating together and damaging the gasket, which would deteriorate the sealing performance, as in the conventional case.

Further, in the above embodiment, the male thread portion 1 of the joint body 11
The protrusion 19 formed on the retainer 13 is formed in a convex shape, and the lock portion 20 formed on the retainer 13 utilizes a divided space, but the present invention is not limited to this. Not only is it possible to form a concave shape on the outer peripheral surface of the retainer 13 other than the divided spaces, but it is also possible to form the projection part 19 in a concave shape and the lock part 20 in a convex shape depending on the implementation. Furthermore, although the retainer 13 described above is configured in a split type in which it is divided in the longitudinal direction, it is not completely divided, but is configured so that both retainer pieces are connected together with a hinge as shown in FIG. You may do so.
Furthermore, the number of protrusions 19 and locking parts 20 is not limited to two, and it is also possible to form one or two or more.

(Effects of the invention) As described above, the present invention is characterized in that a protrusion is formed on the inner wall surface of the male thread of the joint body, and a lock part that engages with the protrusion is formed on the retainer. Therefore, even if the retainer is distorted due to deformation or the like and frictional resistance increases when the cap nut rotates, the retainer will engage its own locking portion with the protrusion formed on the inner wall surface of the male thread portion of the joint body. Since co-rotation is prevented, it is completely possible to prevent the retainer from co-rotating together with the flexible pipe when the cap nut rotates as in the conventional case.

Therefore, the present invention has an extremely simple structure, and
This completely prevents the flexible tubes from rotating together, making a major contribution to improving sealing performance.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view showing a pipe joint according to an embodiment of the present invention, Figure 2 is a half-sectional view showing a state in which flexible pipes are connected, and Figure 3 is a conventional pipe joint used to connect flexible pipes. FIG. 4 is a perspective view showing another example of the retainer used in the present invention. 11... Joint body, 12... Cap nut, 13...
...Retainer, 15...Male thread part, 16...Female thread part, 18...Flange part, 19...Protrusion part (divided space), 20...Lock part, 21...Flexible pipe.

Claims (1)

[Scope of utility model registration request] A flexible tube comprising at least a joint body, a cap nut, and a retainer having a waveform shape on the inner periphery, a male thread portion that is threadedly engaged with a female thread portion of the cap nut is formed on the joint body, and the joint body exhibits an outer frequency wave shape. In this pipe joint, a projection is formed on the inner wall surface of the male thread of the joint body, and a lock part that engages with the projection is formed on the retainer. A pipe joint characterized by a split-type split cavity.