JPH0336794Y2 - - 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 body 1, a cap nut 2, a retainer 3, and a gasket 4, and the joint body 1 has a male screw portion 5 that is screwed into the female screw portion 6 of the cap nut 2. At the same time, a corrugated shape 7 that engages with the outer peripheral corrugated shape of the flexible tube 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. It is becoming.

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, and the thin wall portion of the retainer 3 continuing from the flange portion 8 is deformed due to compression, causing distortion, especially the inner circumference of the retainer 3 and the flexible tube. 9 and between the rear end flange 8 of the retainer 3 and the base 2a of the cap nut 2, frictional resistance increases unnecessarily. There was a major problem in that the retainer 3 rotates with the retainer 3, and if the gasket 4 is tightened strongly, the gasket 4 is twisted and the sealing performance is deteriorated.

(Means for Solving the Problems) Therefore, the present invention was developed to effectively solve the problems of the conventional pipe joints. A pipe joint having a structure for connecting a flexible pipe exhibiting an outer frequency wave shape, wherein a female thread is formed in the main body of the joint, and a bush having a rectangular tightening part at one end has a male thread that is screwed into the female thread. At the same time, a flange portion is formed at the other end of the retainer on the joint main body side having a waveform shape on the inner periphery to be pressed by the tip end surface of the male screw portion of the bushing, and the flange portion is engaged with the outer peripheral surface of the flange portion. In addition to forming projections, a structure is adopted in which locking grooves that engage with the engagement projections are formed in the longitudinal direction of the female screw portion surface of the main body of the joint.

(Function) Accordingly, in the present invention, a female screw portion is formed on the joint main body side, a male screw portion is formed on the bush side, and a flange portion is formed on the end portion of the retainer on the joint main body side. The flange portion is pressed by the tip end surface of the upper male screw portion of the bushing, so when the joint body and the bushing are tightened, the flange portion of the retainer is pressed by the tip end surface of the male screw portion of the bushing, and Since the outer circumferential surface of the thin walled portion of the retainer continuing from the flange portion does not contact the inner circumferential surface of the male threaded portion while receiving a tensile load, the retainer does not suffer from distortion due to deformation during compression, etc. as in the conventional case.

Furthermore, even if the retainer were to rotate together with the flexible pipe, the pair of upper and lower engagement protrusions formed on the flange part would surely engage in the pair of upper and lower locking grooves formed on the female thread part of the main body of the joint. In addition, since the retainer is completely prevented from rotating together, there is no need to worry about the flexible tube rotating together and degrading the sealing performance, unlike in the conventional case.

(Embodiment) Hereinafter, the present invention will be described in detail based on an illustrative embodiment. As shown in FIG. It is characterized by the following configuration.

That is, in this embodiment, unlike the conventional case, the female thread portion 16 is formed on the joint main body 11, and the bush 1
2 is formed with a male threaded part 15 that threads into the female threaded part 16, so that when both 11 and 12 are tightened, the male threaded part 15 of the bush 12 is threaded into the inside of the joint main body 11. It is something.

The retainer 13 is similar to the conventional retainer in that it has a waveform 17 on its inner circumferential surface that engages with the outer circumferential waveform of the flexible pipe, but in this embodiment, it is divided into two parts in the longitudinal direction. The thick flange portion 18 is formed at the tip of the retainer 13, that is, at the end on the side of the joint main body 11, so that when the bush 12 rotates, the flange portion 18 is connected to the male screw portion of the bush 12. It is configured to be pressed by the tip surface of No. 15.

Furthermore, in this embodiment, the flange portion 18
Two upper and lower engaging protrusions 19 are formed on the opposing outer circumferential surfaces of the joint body 11, and
Locking grooves 20 that engage the respective engaging protrusions 19 are formed to face each other in the longitudinal direction of the surface, and the engagement of the engaging protrusions 19 with the respective locking grooves 20 causes the retainer 13 to be inserted into the female body of the joint main body 11. It is constructed so that it can be reliably locked into the screw portion 16.

Therefore, when connecting the flexible pipe 21 to the joint main body 11 using a pipe joint with such a configuration, first, the bushing 12 is fitted onto the end of the flexible pipe 21, and at the same time, the corrugated shape 17 of the retainer 13 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 main body 11. Then, when the bush 12 is rotated in a predetermined direction while screwing together the female thread part 16 of the joint body 11 and the male thread part 15 of the bush 12, the bush 12 touches the tip flange of the retainer 13 with the tip surface of the male thread part 15. While pressing part 18,
It is sequentially tightened to the joint main body 11.

Incidentally, when the bush 12 is rotated, each engagement protrusion 19 formed on the flange portion 18 of the retainer 13 engages with a locking groove 20 formed on the female thread portion 16 of the joint main body 11. , are linearly guided inside the joint main body 11 without co-rotating,
This will ensure reliable positioning.

Then, as the bush 12 rotates, the flexible tube 21 is also pressed in the same direction via the retainer 13, compressing the end portion 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 connected to the joint main body 11.

However, in this embodiment, unlike the conventional case, a female thread part 16 is formed on the joint main body 11 side, a male thread part 15 is formed on the bush 12 side, and a thick flange part is formed on the tip of the retainer 13. 18, and the flange portion 18 is pressed by the tip end surface of the male threaded portion 15 of the bushing 12. Therefore, when the joint main body 11 and the bush 12 are tightened, the tip flange portion 18 of the retainer 13 The thin wall portion of the retainer 13 that is pressed by the tip end surface of the male threaded portion 15 of the bush 12 and continues from the flange portion 18 is
Since it is drawn in without contacting the inner circumferential surface of the male threaded portion 15 while being subjected to a tensile load, there is almost no risk of distortion due to deformation due to compressive load, etc. as in the conventional case.

Therefore, even if the inner circumference of the retainer 13 and the flexible pipe 2
Even if frictional resistance occurs between the contact surface with the outer periphery of the retainer 13, the contact surface between the outer periphery of the retainer 13 and the inner wall of the male threaded portion 15, and the contact surface between the flange portion 18 and the male threaded portion 15, these frictions The total resistance is the joint main body 11
This is inevitably smaller than the frictional resistance that occurs between the contact surfaces of the gasket 14 and the flexible tube 21, and the retainer 13 deforms under the compressive load, causing the inner and outer circumferential surfaces of the retainer 13 to deform. Since the friction on the contact surface does not increase, the flexible tube 21 is effectively prevented from rotating together with the rotation of the bush 12.

Further, when the bush 12 is rotated, the two upper and lower engaging protrusions 19 formed on the flange portion 18 are securely engaged in the corresponding locking grooves 20 formed on the female thread portion 16 of the joint main body 11. Therefore, even if the retainer 13 tries to rotate together with the flexible tube 21, due to the engagement of both 19 and 20,
This means that it is completely possible to prevent the flexible pipe 21 from rotating together via the retainer 13 and deteriorating the sealing performance.

Further, FIG. 4 is a perspective view showing another example of the retainer 13 according to the first embodiment, and as shown in the figure, the retainer 13 is constructed such that both retainer pieces are connected together by a hinge 13a. It may be configured.

(Effects of the invention) As described above, the present invention forms a female threaded part on the joint main body, forms a male threaded part on the bushing that screws with the female threaded part, and at the same time forms a bushing on the end of the retainer on the side of the joint main body. A flange portion is formed which is pressed by the tip end surface of the male thread portion of the joint, and an engaging protrusion is formed on the outer periphery of the flange portion, and a locking groove for engaging the engaging protrusion is formed on the female thread portion of the main body of the joint. Therefore, when the joint main body and the bushing are tightened, the flange part of the retainer is pressed by the tip surface of the male thread part of the bushing, and the thin part of the retainer continuing from the flange part is pressed by the male thread part. Since the retainer comes into direct contact with the inner wall surface of the threaded portion, the retainer does not suffer from distortion due to deformation or the like as in the conventional case.

Therefore, even if frictional resistance occurs between the contact surface between the inner periphery of the retainer and the outer periphery of the flexible tube, the contact surface between the outer periphery of the retainer and the inner wall of the male screw portion, and the contact surface between the flange portion and the male screw portion. However, the sum of these frictional resistances does not become the resistance force that causes the flexible pipe to rotate together due to the rotation of the bushing. Therefore, the present invention has an extremely simple structure and completely prevents the flexible pipe from rotating together. This made it possible to make a significant contribution to improving sealing performance.

Moreover, even if the retainer tries to rotate together with the flexible tube, the engagement protrusion formed on the flange part will surely engage in the locking groove formed on the female thread part of the main body of the joint. This completely eliminates the concern that the flexible pipes will rotate together and deteriorate the sealing performance, and the positioning of the retainer and the joint itself can be facilitated.

[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 main body, 12... Button, 13...
...Retainer, 15...Male thread part, 16...Female thread part, 18...Flange part, 19...Engaging protrusion, 2
0...Lock groove, 21...Flexible tube.

Claims (1)

[Scope of utility model registration request] A pipe joint is provided with at least a joint main body, a bush, and a retainer, and has a structure in which a flexible pipe exhibiting an outer frequency wave shape is connected to the joint main body, wherein a female thread is formed in the joint main body, and a rectangular tightening part is formed at one end. A male threaded part is formed on the bushing having a male threaded part to be threadedly engaged with the female threaded part, and a flange part which is pressed by the tip surface of the male threaded part of the bushing is formed on the other end of the retainer on the joint main body side having a waveform shape on the inner periphery. and forming an engaging protrusion on the outer peripheral surface of the flange portion,
A pipe joint characterized in that lock grooves that engage with the engagement protrusions are formed in the longitudinal direction of the female threaded portion of the main body of the joint.