JP3569037B2 - Pipe connection mechanism - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pipe connection mechanism used for connecting a cable protection pipe or the like.
[0002]
[Prior art]
As a conventional pipe connection mechanism, for example, a plurality of slits are provided near one end of the pipe and a flange is formed. In addition, a groove is formed in the sleeve that fits with the tube, and the flange of the tube inserted along the tapered portion fits into the groove formed on the inner periphery of the sleeve. As another example, there has been proposed a configuration in which a screw is formed at an end of a tubular body and screwed with a correspondingly formed screw.
[0003]
[Problems to be solved by the invention]
By the way, in the conventional pipe connection mechanism described above, a slit is formed near the end of the pipe, and since there is only one concave groove, stress is concentrated when the connection portion is bent, and the protection pipe is There was a disadvantage that the seal could not be completed. In addition, the inner diameter of the seal ring portion becomes thin, and a steel wire inserted therein may be caught and damaged. Further, in the case of forming a screw at the end of the tube body and screwing the two together, it has to be twisted in order to join, and the work of connecting a long tube body has been difficult.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a tube connection mechanism which has been made in view of the above-mentioned conventional disadvantages, has a simple connection, and has excellent sealing properties.
[0005]
[Means for Solving the Problems]
A tube connecting mechanism according to the present invention includes a sleeve having a ring member at an inner central portion thereof, and having a plurality of inscribed rings on inner peripheral surfaces near both ends from the central portion, and an inner peripheral surface of the sleeve. A tubular body having a plurality of annular grooves that are fitted with the plurality of inscribed rings when the distal end abuts on the ring member, and the plurality of inscribed rings are The width of the plurality of inscribed rings is sequentially increased from the depth side toward the opening end, and the plurality of annular grooves are configured such that the width of the plurality of annular grooves is sequentially reduced from the depth side toward the opening end. It is characterized by having done.
[0006]
Further, the sleeve has a tapered inner peripheral surface that expands from a central portion toward both ends, and the plurality of inscribed rings are disposed on the inner peripheral surface. is there. Further, the plurality of inscribed rings are characterized in that an inner peripheral portion is formed in a tapered shape. Further, the ring member is made of an expanding material.
[0007]
As described above, according to the tube connecting mechanism of the present invention, the inscribed ring and the annular groove can be easily connected simply by inserting the tube into the sleeve.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view showing a joined state of a tube connecting mechanism according to one embodiment of the present invention, and FIG. It is.
[0009]
The tube connection mechanism 10 of the present invention includes a sleeve 11 and a tube 12, and has a seal ring 13 at a central portion 11a of the sleeve 11. The seal ring 13 is made of a water-swellable material, and expands about three times or more when absorbing water. The seal ring 13 is fitted in a groove 11 b formed on the inner periphery of the center of the sleeve 11.
[0010]
The sleeve 11 is made of black PE resin or the like, has a tapered inner peripheral surface that is enlarged toward both ends, and has inscribed rings 14, 15, 16. The inscribed rings 14 to 16 are made of hard nylon (MC nylon) or the like, and have a tapered portion 14a formed on the inner periphery as shown in FIG. In this embodiment, three inscribed rings are provided, and the width is sequentially increased from the depth side toward the opening end side. The width of the inscribed ring is configured such that, for example, the inscribed ring 14 is 10 mm, the inscribed ring 15 is 7 mm, and the inscribed ring 16 is 4 mm.
[0011]
The inscribed rings 14 to 16 have cut portions 14b to 16b, so that the inner diameter can be enlarged. The inscribed rings 14 to 16 are mounted in inner peripheral grooves 17 to 19 formed on the inner periphery of the sleeve 11.
[0012]
The tubular body 12 is provided with annular grooves 20 to 22 which are inserted into the inner peripheral surface of the sleeve 11 and engage with the respective inner rings 14 to 16 when the distal end portion 12 a comes into contact with the seal ring 13. ing. Accordingly, the width of the annular groove is slightly wider than that of the inscribed ring. In this embodiment, the annular groove 20 is 5 mm, the annular groove 21 is 8 mm, and the annular groove 22 is 11 mm. The tube 12 is made of a synthetic resin, for example, a PE resin or the like.
[0013]
The distal end of the tube 12 is chamfered 12b so that it can be easily inserted into the sleeve 11. An adhesive 23 is applied to the bottoms of the annular grooves 20 to 22 in advance.
[0014]
Next, a method of using the tube connecting mechanism 10 of the present invention configured as described above will be described. The tube connection mechanism 10 includes a sleeve 11 and a tube 12, and inserts the tube 12 from both ends of the sleeve 11 toward the central portion 11a. The annular groove 20 formed at the extreme end of the inserted tube 12 first encounters the widest inscribed ring 14 disposed at the extreme end of the sleeve 11. Since the width of the inscribed ring 14 is wider than the width, it does not fall into the groove at this position.
[0015]
Further, when the pipe body 12 advances, the annular groove 20 encounters the inscribed ring 15, but since the width of the inscribed ring 15 is wider than the width of the annular groove 20, the annular groove 20 does not fall into the groove at this position. . When the annular groove 20 further advances and meets the inscribed ring 16, it is fitted here only for the first time. Similarly, even if the next annular groove 21 encounters the inscribed ring 14, it does not fit here because the width of the inscribed ring 14 is wide. It fits only when it encounters the inscribed ring 15. The annular groove 22 fits with the inner ring 14 at a position where the annular groove 20 fits with the inner ring 16 and the annular groove 21 with the inner ring 15.
[0016]
Further, the distal end portion 12a of the tube body 12 comes into contact with the seal ring 13 disposed at the center of the inner periphery of the sleeve 11 at a position where the respective inner rings 14 to 16 and the annular grooves 20 to 22 are fitted. (See FIG. 1).
[0017]
Since the adhesive 23 is applied to the bottoms of the annular grooves 20 to 22, for example, the connection between the sleeve 11 and the tube 12 can be completed, and no water leakage or the like occurs. Further, a seal ring 13 is provided at the center of the sleeve 11, and is pressed from both ends by a distal end portion 12a of the tube body 12. When grouting is performed inside, the seal ring 13 is made of a water-swelling material. , Watertightness can be improved. The seal ring 13 also serves as a stopper ring for stopping the advance of the tube. Note that a sealing material such as rubber may be used instead of the adhesive 23.
[0018]
FIG. 3 is a partially cutaway side view showing a tube connection mechanism 30 according to another embodiment of the present invention. The tube connection mechanism 30 includes a sleeve 31 and a tube 32, and the sleeve 31 has an inner ring 33 on a tapered inner peripheral surface. On the other hand, the tubular body 32 inserted into the inner peripheral surface of the sleeve 31 has an annular groove 34 at a position where the tubular body 32 fits into the inner ring 33 when the distal end abuts on a seal ring (not shown). The adhesive 23 is filled in the annular groove 34.
[0019]
With such a configuration, even if the inscribed ring 33 and the annular groove 34 are each one, the tube 32 and the sleeve 31 can be easily fitted together, and the adhesive and the seal ring make it watertight. Can be improved.
[0020]
FIG. 4 is a partially cutaway side view showing a tube connecting mechanism according to another embodiment of the present invention. The tube connection mechanism 40 includes a sleeve 41 and a tube 42, and has a ring member (not shown) at the center of the sleeve 41. Two inner rings 43 and 44 are provided on the inner peripheral surface of the sleeve 41, and the width of the inner ring 43 is configured to be wider than the width of the inner ring 44 on the depth side. In this embodiment, for example, the width of the inscribed ring 43 is 10 mm, and the width of the inscribed ring 44 is 4 mm. This width can be set arbitrarily.
[0021]
The width of the annular groove 46 formed in the tube 42 inserted into the sleeve 41 is made wider than the width of the annular groove 45 in accordance with the inner ring. That is, it is configured such that the opening end side of the tube body 42 is narrowed. The annular grooves 45 and 46 are filled with the adhesive 23.
[0022]
In such a configuration, the tube 42 is inserted from the end of the sleeve 41 toward the center. The annular groove 45 formed at the end of the inserted tube 42 encounters the inscribed ring 43 provided at the end of the sleeve 41, and the width of the inscribed ring 43 is larger than the width of the annular groove 45. Because it is wide, it does not fall into the groove at this position.
[0023]
Further, as the tube 42 advances, the annular groove 45 encounters the inscribed ring 44. Here, they fit together. The next annular groove 46 is similarly fitted when it encounters the inscribed ring 43. As described above, the pipe connecting mechanism 40 of the present embodiment fits only when completely inserted without the inner ring and the annular groove being fitted during insertion.
[0024]
It should be noted that the present invention is not limited to the above embodiments, and various design changes can be made based on the technical idea of the present invention.
[0025]
【The invention's effect】
As described in detail above, according to the tube connection mechanism of the present invention, the inner peripheral surface of the sleeve has a plurality of inscribed rings, and the widths of the plurality of inscribed rings are sequentially changed from the depth side to the open end. Since the width of the plurality of annular grooves to be fitted to the plurality of inscribed rings formed in the tube inserted into the sleeve is sequentially narrowed from the depth side toward the opening end side, At a halfway position between the sleeve and the tube, the sleeve and the tube are fitted only when completely inserted without being fitted. Therefore, no connection failure occurs.
[0027]
Since the inner peripheral portion of the inscribed ring is formed in a tapered shape, it is easy to insert the tubular body. In addition, since the ring member is made of an expanding material, watertightness can be maintained when grouting, and the effect of stopping water from inside and outside can be improved.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a joined state of a tube connecting mechanism according to an embodiment of the present invention.
FIG. 2 is a partially cutaway side view showing a state before joining of a tube connecting mechanism according to an embodiment of the present invention.
FIG. 3 is a partially cutaway side view showing a tube connecting mechanism according to another embodiment of the present invention.
FIG. 4 is a partially cutaway side view showing a tube connection mechanism according to another embodiment of the present invention.
FIG. 5 is an enlarged partially cutaway sectional view showing an inscribed ring used in the tube connecting mechanism of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Pipe connection mechanism 11 Sleeve 11a Central part 11b Groove 12 Pipe 12a Tip part 12b Chamfer 13 Seal ring 14-16 Inner ring 17-19 Inner circumference groove 20-22 Annular groove 23 Adhesive 30 Pipe connection mechanism 31 Sleeve 32 pipe 33 internal ring 34 annular groove 40 pipe connection mechanism 41 sleeve 42 pipe 43, 44 internal ring 45, 46 annular groove

Claims (4)

A sleeve having a ring member at an inner central portion, and having a plurality of inscribed rings on inner peripheral surfaces near both ends from the central portion, and a sleeve inserted from both ends into the inner peripheral surface of the sleeve, and a tip portion is A tubular body having a plurality of annular grooves fitted with the plurality of inscribed rings when abutting on a ring member ,
The plurality of inscribed rings are configured such that the widths of the plurality of inscribed rings are sequentially increased from a depth side toward an open end side, and the plurality of annular groove portions sequentially increase the width of the plurality of annular groove portions from the depth side. And a tube connecting mechanism which is narrowed toward an opening end side . 2. The sleeve according to claim 1, wherein the sleeve has a tapered inner peripheral surface that expands from a central portion toward both ends, and the plurality of inscribed rings are disposed on the inner peripheral surface. 3. Pipe connection mechanism. The tube connection mechanism according to claim 1, wherein the plurality of inscribed rings have inner peripheral portions formed in a tapered shape. 2. The tube connecting mechanism according to claim 1, wherein said ring member is made of an inflatable material.

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