JP3508083B2 - Sleeve for connecting pipes and method for connecting pipes using the sleeve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to corrugated pipes formed by alternately and independently forming concave stripes and convex stripes on the outer peripheral portion, or heat having no corrugated stripes on the corrugated pipe and outer peripheral portion. The present invention relates to a sleeve for pipe connection used for connection with a plastic resin pipe and the like, and a pipe connection method using the sleeve.

[0002]

2. Description of the Related Art A method of connecting corrugated pipes of thermoplastic resin, which are formed by alternately arranging recessed ridges and ridges alternately on the outer periphery, is to connect the ridges and the ridges on the outer periphery. Formed alternately and independently, when inserting a pipe with a smooth surface inside and connecting a pair of corrugated pipes whose inner peripheral surface is flush, attach a sleeve to the outside of one corrugated pipe After projecting one end side of the sleeve from the end wall of one corrugated pipe, thermoplasticity is provided in the gap formed by the inner peripheral wall of the sleeve and the side wall of the convex stripe and the wall surface of the concave stripe at the end of the corrugated pipe. Insert a welding ring made of resin with electric resistance wire,
Then, insert the pipe end of the other corrugated pipe into the sleeve, and energize the electric resistance heating part of the welding ring to melt and deform the end face regions of both pipes and press both pipes together to form a corrugated pipe. There is known a method (Japanese Patent Publication No. 7-96270) in which the ends of the above are connected by heat fusion. There is also described therein an aspect in which a welding ring is integrated with the sleeve.

[0003]

Since the above-mentioned method for connecting corrugated pipes is to connect the ends of the corrugated pipes to each other by heat fusion, the ends of the corrugated pipes to be connected are to be connected. It is necessary to have a weld ring having the electric resistance heating portion in the wave trough formed by the above. Therefore, the valley widths of the wave troughs at the ends to be joined of the corrugated pipes must be half-divided to approach each other to form one corrugation part. Since it is necessary to dispose the welding ring at the wave trough, the structure is complicated and the operation is inevitably complicated. Further, in a state where the pipe ends to be connected of the corrugated pipes are once brought close to each other, the pipe end portions are melted and deformed by heating by an electric resistance heating portion provided on the welding ring, and then the pipes are pressed together. There is a two-step complicated operation for wearing clothes.

In view of the above situation, the present invention has one end of the sleeve main body as a tubular portion capable of receiving the corrugated pipe, and the end of the tubular portion is engaged with the recessed portion of the corrugated pipe. A plurality of tongue pieces having mating engagement pieces are integrally projected at equal intervals, and an electrofusion coil facing the ridge of the corrugated tube is provided at a predetermined portion of the inner peripheral wall of the tubular portion. Accordingly, a pipe connecting sleeve that can easily and easily connect corrugated pipes or corrugated pipes (hereinafter referred to as "smooth pipes") to each other, and a pipe using the sleeve. It is intended to provide a connection method.

[0005]

In order to achieve the above object, the invention according to claim 1 of the present invention has a corrugated portion in which concave and convex portions are alternately and independently formed on the outer peripheral portion. A sleeve for receiving a pipe at least at one end and integrally connecting it to the outer peripheral portion of the corrugated pipe by heat fusion, in which one end of the sleeve main body is in close contact with the outer peripheral portion of the corrugated pipe. And a plurality of tongue pieces that have engaging pieces that engage with the recessed portions of the corrugated pipe at the ends of the tubular portion are integrally projected at a predetermined interval. A pipe connection characterized in that an electrofusion coil is provided on an inner peripheral wall portion of the corrugated pipe that faces the convex strip portion of the corrugated pipe when the engaging piece engages with the concave strip portion of the corrugated pipe. It is a sleeve for.

Further, the invention according to claim 8 is a corrugated pipe in which at least one end portion of a sleeve main body made of a thermoplastic resin is formed with concave and convex ridges alternately and independently on an outer peripheral portion. The corrugated pipe is provided at a predetermined position by engaging and positioning the respective engaging pieces of the tongue pieces, which are received and arranged at the one end of the sleeve main body with a predetermined space therebetween, and engage with the recessed ridges. With the temporary fixing to, the heating portion provided with the electric welding coil provided on the inner peripheral wall of the one end side of the sleeve main body is brought into contact with the ridge portion of the corrugated pipe by this temporary fixing,
It is a method of connecting pipes by a sleeve for connecting pipes, characterized in that the abutting portions of the corrugated pipe and the sleeve main body are melted and integrated by energizing the heating portion.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a corrugated pipe refers to a pipe made of a thermoplastic resin in which a concave portion and a convex portion are alternately and independently formed on the outer peripheral portion, and only the outer peripheral surface of the pipe is referred to. If the above-mentioned uneven strip portion is formed, the inner peripheral surface may be smooth without uneven strips, or the independent uneven strip portion may be formed on the inner and outer surfaces of the pipe, It does not include a tube that is not formed independently, for example, a tube in which spiral ridges and ridges are formed on the outer peripheral surface.

The sleeve main body may be a thermoplastic resin such as polyethylene, polypropylene, polyvinyl chloride, ABS resin, polystyrene, and polybutene that is melted and heat-fused by heating, like a corrugated tube, and is a tighter integral body. It is preferable to use the same kind of thermoplastic resin as that for the corrugated tube.

The sleeve-based shape is a straight pipe for coaxial connection in two directions, a T-shaped or Y-shaped branch pipe for connection in three directions, and four directions depending on the purpose of connection. It is composed of either a cross-shaped or X-shaped branch pipe for connection to a pipe, and in any shape, at least one end has a tubular portion into which a corrugated pipe to be connected can be inserted. The pipe inserted into the other end may be a corrugated pipe or a smooth pipe.

Further, a plurality of tongue pieces are integrally projected at a predetermined interval at the opening edge of the sleeve main body on the side where the corrugated tube is inserted, and the tongue pieces are connected to the inside of each tongue piece. Engaging pieces that engage with the groove portions formed on the corrugated tube are integrally provided. This tongue piece engages with a concave streak near the tube end of the corrugated tube that connects the tongue piece to the heating section provided with the electric welding coil formed on the inner peripheral wall near the opening edge of the sleeve main body. For accurately abutting on a predetermined convex portion of the corrugated pipe, and it is preferable that at least two tongue pieces are formed at the opening edge portion of the sleeve main body at equal intervals, and particularly, 3 to 4 pieces. Is more preferable.

As described above, if the sleeve main body can receive the corrugated tube at one end, the other end may receive the corrugated tube or the smooth pipe. It is preferable to provide a stopper made of a ridge for centering the pipe end of the fitted corrugated pipe or the smooth pipe on the inner periphery of the center. At that time, when the connecting pieces are corrugated tubes, tongues having engaging pieces that engage with the recessed portions of the corrugated tube are provided at both ends of the corrugated tube.

When a smooth pipe other than the corrugated pipe is connected to the other end, the electrofusion coil is provided at a desired portion of the inner peripheral wall of the sleeve main body on the smooth pipe side, similarly to the case where it is provided on the receiving side of the corrugated pipe. It is desirable to connect the smooth pipe to the sleeve main body by heat fusion by energization, and also in this case, by providing a ring-shaped stopper at the center inner circumference of the sleeve main body, It is possible to prevent an excessively deep or shallow insertion depth of the pipe.

[0013]

The sleeve for pipe connection according to the present invention engages with the recessed portion near the pipe end of the corrugated pipe to which the engaging piece of the tongue provided at the open end for receiving the corrugated pipe is connected. By doing so, the mounting position of the sleeve can be determined, and the heating part equipped with the electric welding coil provided on the inner peripheral wall in the vicinity of the receiving side of the corrugated pipe can be accurately attached to the predetermined ridge of the corrugated pipe. Can be brought into contact with.

Further, by engaging the engagement piece provided on the tongue piece with the concave portion of the corrugated pipe to be connected, the sleeve and the corrugated pipe are temporarily fixed at the time of fusion by the heating portion. Can play a role.

In the pipe connecting method using the sleeve of the present invention, the corrugated pipe to be connected is inserted into the receiving side of the sleeve main body, and the engaging piece provided via the tongue provided on the sleeve main body is corrugated. The corrugated tube and the sleeve can be securely fusion-bonded to each other by a simple method of engaging with the concave portion of the tube.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete example of a sleeve for pipe connection according to the present invention and a pipe connecting method using the sleeve will be described in detail with reference to the accompanying drawings. 1 and 2 show a ridge portion 1a having a constant width, and a ridge portion 1b having a constant width.
A corrugated pipe 1 made of polypropylene, which is formed by alternately arranging and alternating with each other, and a smooth pipe 2 made of polypropylene having an outer diameter equal to the outer diameter of the ridge portion 1a of the corrugated pipe 1. A polypropylene sleeve 3
2 shows a case where they are coaxially connected in two directions.

The sleeve 3 for connecting the corrugated pipe 1 and the smooth pipe 2 has a corrugated pipe on the left side with a stopper 10 formed of a ring-shaped protrusion provided on the inner periphery of the central portion as a boundary. The fitting portion 3a of the corrugated pipe 1 has an inner diameter that substantially coincides with the ridge portion 1a of FIG. 1 and the fitting portion 3b of the smooth pipe 2 has an inner diameter sufficient to fit the smooth pipe 2 on the right side. On one fitting portion 3a, tongue pieces 5 provided with engaging pieces 4 on the inside (the surface facing the concave portion of the corrugated pipe) are projected at equal intervals at four positions around the tip end portion. .

A heating portion 6 is formed by embedding the electric fusion coil 7 on the inner peripheral wall of the fitting portion 3a which holds a predetermined distance from the engaging piece 4. This heating part 6
Is formed with a relatively narrow width corresponding to the width of the ridge portion 1a of the corrugated tube 1, and the end portion of the electric fusion coil 7 is drawn to the outside and connected to a power source (not shown) so that it can be energized. It has become.

The setting position of the heating portion 6 in the sleeve 3 is such that one end of the corrugated tube 1 is fitted into the sleeve 3 and the engaging piece 4 of the tongue piece 5 projecting on the fitting portion 3a side of the sleeve 3.
With the corrugated tube 1 engaged with the groove portion 1b of the corrugated pipe 1,
Is set at a position where it comes into contact with the ridge portion 1a of the corrugated pipe 1. Therefore, when the engagement piece 4 provided on the tongue piece 5 of the sleeve 3 is engaged with the position of the recessed strip portion 1b having the corrugated pipe 1 fitted therein, the heating portion 6 causes the heating strip 6 to protrude to the protruding strip portion of the corrugated pipe 1. It surely comes into contact with 1a.

A heating portion 8 having an electric fusion coil 9 is formed in a relatively wide width on the inner peripheral surface of the inner portion of the fitting portion 3b of the smooth pipe 2, and the end of the electric fusion coil 9 is formed. In the same manner, the section is pulled out to the outside and connected to a power source (not shown) so that it can be energized.

The connection between the corrugated pipe 1 and the smooth pipe 2 using the sleeve 3 having such a structure can be easily and easily carried out by the procedure described below. That is, one end of the corrugated pipe 1 is inserted from the left side of the sleeve 3 and one end of the smooth pipe 2 is inserted from the right side, and each pipe end is inserted to a position where it abuts the stopper 10. Although the smooth pipe 2 is kept in contact with the stopper 10, the corrugated pipe 1 has its fitting position adjusted to corrugate the engaging piece 4 of the tongue piece 5 provided on the fitting portion 3a of the sleeve 3. It is engaged with a predetermined recessed portion 1b of the attached tube 1. By this engagement, the heating portion 6 provided on the inner peripheral wall of the sleeve 3 on the side of the corrugated tube 1 surely abuts the outer peripheral surface of the ridge portion 1a of the corrugated tube 1.

In this state, when the electric welding coils 7 and 9 of the heating portions 6 and 8 are energized, the heating portion 6 and the ridge portion 1a of the corrugated tube 1 which is in contact with the heating portion 6 are melted and integrated with each other. At the same time, the heat generated by the heating unit 8 melts the outer peripheral surface of the smooth pipe 2 which is in contact therewith, and the two pipes are connected together by being integrated in the same manner.

Due to such integration, the corrugated pipe 1 and the smooth pipe 2 are firmly connected by the sleeve 3, and the corrugated pipe 1 extends over the entire circumference of the predetermined ridge portion 1a and is smooth. Since the welded portion of the pipe 2 is fused over the entire circumference in a predetermined wide area, the inside of the pipe can be kept airtight.

FIG. 3 shows another embodiment of the sleeve for pipe connection according to the present invention, in which corrugated pipes 11 and 12 having the same diameter are provided.
It shows a case where and are connected to each other coaxially by the sleeve 13. The sleeve 13 for connecting the corrugated pipes 11 and 12 has a ring-shaped stopper 22 similar to the above on the inner peripheral surface of the center, and one corrugated pipe 11 from the left side of the figure,
The engaging pieces 14, 18 of the tongue pieces 15 and 19 respectively formed on the peripheral edges of the left and right ends by fitting the other corrugated tube 12 from the right side, respectively, and the respective corrugated strip portions 11b of the corrugated tubes 11, 12 respectively. , 12b, and the electric fusion coils 17 provided on the heating parts 16 and 20 formed on the inner peripheral wall of the inner part,
The two corrugated tubes 11 and 12 can be easily and surely connected by energizing and heating and fusing.

FIG. 4 shows a corrugated tube 31 in at least one direction.
Shows a T-shaped sleeve 34 in which the smooth pipes 32 and 33 are coaxially connected in the other two directions, and each engaging piece of a plurality of tongue pieces 36 formed at the end of the insertion portion of the corrugated pipe 31. 35 is engaged with the concave streak portion 31b of the corrugated pipe 31 to bring the heating portion 36 into contact with the convex streak portion 31a of the corrugated pipe 31, whereby the electric fusion coil 3
The heating part 37 provided with 8 is energized and connected by thermal fusion. The other two-direction smooth pipes 32 and 33 are
These are fitted into their respective coaxial ends and then heated by the heating parts 39a and 39b formed of the electric fusion coils formed on the inner peripheral surface of the inner part of each insertion part to be integrated by melting. Each tube 31, 32 and 3 by
3 can be easily connected.

In FIG. 5, the corrugated pipes 41, 42 and 43 of the same diameter are respectively provided in the three T-shaped insertion portions as described above.
It shows an example in which is connected. That is, the sleeve 4
4, each corrugated pipe 41 is provided at the end of each insertion portion arranged in a T-shape.
A plurality of tongue pieces 46 having engaging pieces 45a, 45b, 45c that engage with the concave portions 41b, 42b, 43b of 42, 43.
a, 46b, 46c are provided, and a heating part 47 formed of an electrofusion coil is provided inside the inner part of each insertion part.
a, 47b and 47c are provided and each corrugated pipe 41, 42 is provided.
And 43 are fitted in from the respective insertion portions of the sleeve 44, and the engaging pieces 45a, 45b and 45c are engaged with the ridge portions 41b, 42b and 43b of the corrugated pipes, respectively, so that they are arranged at predetermined positions. The heating unit 47a,
47b and 47c are provided with corrugated tubes 41, 42 and 43, respectively.
Abutting against the predetermined ridges 41a, 42a and 43a of
The corrugated pipes 41, 42, 43 are integrally connected to the sleeve 44 by energizing the electric fusion coils forming the heating units 47a, 47b and 47c.

FIG. 6 shows still another embodiment of the sleeve according to the present invention, in which one end of the sleeve 52 is provided with the corrugated pipe 5.
In the same manner as described above, the corrugated tube 51 is attached to the fitting portion at the one end by gradually expanding the diameter in a trumpet shape with the other end facing the tip. The corrugated pipe 51 connected to this sleeve 52 is
When a long linear object such as a cable is inserted into the inside from the trumpet-shaped opening 53, it can be advantageously operated.

[0028]

The sleeve for pipe connection according to the present invention comprises a plurality of tongue pieces provided with an engaging piece for engaging with the groove of the corrugated tube to be connected to the tip end for receiving the corrugated tube. Are arranged at a predetermined interval, and the inner wall of the receiving side is abutted against a required ridge portion of the corrugated pipe fitted when the engaging piece is engaged with the ridge portion. Since the heating portion having the coil for electric fusion for contact is provided, the corrugated tube and the sleeve can be simply and easily and surely connected by fusion.

In particular, the sleeve for pipe connection of the present invention is
Inserting the corrugated tube into the sleeve, because a plurality of tongue pieces having engaging pieces that engage with the recessed portions of the corrugated tube are arranged at predetermined intervals in the receiving portion of the corrugated tube. At this time, the elasticity of the tongue piece allows the tongue piece to be easily spread outward so that the corrugated tube can be smoothly inserted into the sleeve. By simply engaging, the heating part consisting of the electric fusion coil can be reliably brought into contact with the required convex strip of the corrugated tube, and furthermore, by the temporary fixing by the engagement of the concave strip and the engaging piece. The connection by fusion and subsequent curing can be made more reliable.

According to the method for connecting pipes using the sleeve for pipe connection of the present invention, one end of the corrugated pipe is inserted into the fitting portion provided on the sleeve, and the engaging piece of the tongue provided on the sleeve is not connected. The sleeve and the corrugated pipe can be reliably connected integrally by fusion by a very simple means of engaging with the concave portion of the corrugated pipe.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an example of a method of connecting corrugated pipes using a sleeve of the present invention.

FIG. 2 is a vertical sectional view of FIG.

FIG. 3 is a vertical cross-sectional view showing a method of connecting corrugated pipes using another sleeve according to an embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing a method of connecting corrugated pipes using still another sleeve that is an embodiment of the present invention.

FIG. 5 is a vertical sectional view showing a method of connecting corrugated pipes using still another sleeve which is an embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view showing a method for connecting corrugated pipes using still another sleeve that is an embodiment of the present invention.

[Explanation of symbols]

1, 11 and 12 corrugated tubes 31, 41, 42, corrugated tube 43,51 corrugated tube 2,32,33 Smooth pipe 3,13,34,44,52 Sleeve 4,14 Engagement piece 5,15 tongue 1a Corrugated tube ridge 1b Corrugated tube recess 7,9 Electric fusion coil 6,8 heating part

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaru Kumagai 4-18 Numa, Yao-shi, Osaka Prefecture EF Techno Co., Ltd. (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 47/02 F16L 33 / 00 F16L 33/28 F16L 21/00 F16L 41/00

Claims (9)

(57) [Claims] 1. A corrugated pipe having concave and convex portions alternately and independently formed on an outer peripheral portion thereof is received at least at one end, and is integrally connected to the outer peripheral portion of the corrugated pipe by heat fusion. In the sleeve for carrying out the invention, one end portion of the sleeve main body is formed into a tubular portion into which the outer peripheral portion of the corrugated pipe can be inserted in a substantially closely contacted state, and a concave line of the corrugated pipe is provided at an end portion of the tubular portion. A plurality of tongue pieces having engaging pieces that engage with the portion are integrally projected at a predetermined interval, and when the engaging pieces engage with the concave streak portion of the corrugated pipe, A sleeve for pipe connection, wherein an electrofusion coil is provided on an inner peripheral wall portion of the pipe opposite to the ridge portion. 2. The sleeve main body is a straight tube and has an inner diameter capable of receiving the outer peripheral portion of the corrugated pipe over the entire length in a state where the outer peripheral portion of the corrugated pipe is in close contact with each other. A plurality of tongue pieces having engaging pieces to be engaged with the projecting portion are integrally provided at equal intervals, and when the engaging pieces engage with the concave line portions of the corrugated pipe, the convex strips of the corrugated pipe are provided. The sleeve for pipe connection according to claim 1, wherein an electric fusion coil is provided on each of the inner peripheral wall portions facing each other. 3. The sleeve main body has a straight tubular shape, one end of which is a tubular portion into which the outer peripheral portion of the corrugated pipe can be inserted in a state of being in close contact, and the other end of which has the same diameter as or different from that of the corrugated pipe. A tubular portion capable of receiving a pipe without a corrugated diameter, and a plurality of tongue pieces having an engaging piece that engages with a recessed portion of the corrugated pipe at an opening end on the receiving side of the corrugated pipe, etc. While integrally projecting at intervals, when the engaging piece engages with the groove of the corrugated pipe, an electrofusion coil is provided on the inner peripheral wall portion facing the convex line of the corrugated pipe, 2. A pipe connecting coil according to claim 1, wherein an electrofusion coil is provided at a required portion of the inner peripheral wall on the receiving side of the pipe, and the corrugated pipe and the pipe can be integrally connected. sleeve. 4. The sleeve main body has a straight tubular shape, one end of which is a tubular portion into which the outer peripheral portion of the corrugated pipe can be inserted in a state of being in close contact with the other end, and the other end of which has the same or different diameter as the corrugated pipe. A tubular portion capable of receiving a pipe without a corrugated diameter, and a plurality of tongue pieces having an engaging piece that engages with a recessed portion of the corrugated pipe at an opening end on the receiving side of the corrugated pipe, etc. An electric welding coil is provided on the inner peripheral wall portion of the corrugated pipe facing the convex strip portion of the corrugated pipe when the engaging piece engages with the concave strip portion of the corrugated pipe while being integrally projected at the interval. Claim 1 characterized by the above-mentioned.
Sleeve for pipe connection as described. 5. The sleeve main body has a T-shape or a Y-shape enabling connection between corrugated pipes or corrugated pipes and non-corrugated pipes in three directions, and at least one connecting portion has corrugated pipes. The outer peripheral part of the tubular part is a cylindrical part that can be inserted in a close contact state, and a plurality of tongue pieces having engaging pieces that engage with the groove of the corrugated pipe are provided at equal intervals at the end of the tubular part. In addition to being integrally projected, when the engagement piece engages with the groove of the corrugated pipe, an electric fusion coil is provided on the inner peripheral wall portion facing the convex line of the corrugated pipe. The sleeve for pipe connection according to claim 1. 6. The sleeve main body has a cross shape or an X shape capable of connecting corrugated pipes or corrugated pipes and non-corrugated pipes in four directions, and at least one connecting portion is a corrugated pipe. The outer peripheral portion is formed into a cylindrical portion that can be inserted in a substantially close contact state, and a plurality of tongue pieces having an engaging piece that engages with the recessed portion of the corrugated tube are integrally formed at equal intervals at the end portion of the cylindrical portion. And the engaging piece is engaged with the groove of the corrugated pipe, the electrofusion coil is provided on the inner peripheral wall portion facing the convex line of the corrugated pipe. The sleeve for pipe connection according to claim 1. 7. The sleeve for pipe connection according to claim 1, wherein each of the corrugated pipe, the pipe and the main body of the sleeve is formed of a thermoplastic resin. 8. A corrugated pipe formed by alternately and independently forming concave stripes and convex stripes on an outer peripheral portion of at least one end of a sleeve main body made of a thermoplastic resin is received at the one end of the sleeve main body. The corrugated tube is temporarily fixed to the sleeve main body at a predetermined position by engaging and positioning the respective engaging pieces of the tongue pieces arranged at a predetermined interval with the concave streak, and this temporary fixing The heating part provided with the electric fusing coil provided on the inner peripheral wall of the sleeve main body on the one end side is brought into contact with the ridge part of the corrugated pipe, and the ridge part of the corrugated pipe is supplied by energizing the heating part. A method of connecting pipes by a sleeve for connecting pipes, characterized in that the contact portion with the main body of the sleeve is melted and integrated. 9. The connection by the sleeve includes two-way coaxial connection, two-way coaxial connection, three-way branch connection, and four-way branch connection by either corrugated pipes or corrugated pipes and non-corrugated pipes. 9. The method for connecting pipes by a sleeve for connecting pipes according to claim 8, wherein the pipe is connected by any one of them.