TWI393625B - Pipe connection device - Google Patents

Description

Pipe connection device

The present invention relates to a pipe connecting device comprising a synthetic resin pipe, a diameter expanding tool and a pipe joint. After the inner and outer diameters of the pipe end portion of the synthetic resin pipe are forcibly expanded by an external force, the pipe end portion is naturally reduced in diameter. The expanding tool forcibly expands the inner and outer diameters of the pipe end portion of the synthetic resin pipe which can be naturally reduced in diameter, and the pipe joint connects the pipe end portion of the expanded synthetic resin pipe.

The above-mentioned pipe joints and synthetic resin pipes are described in Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 6, and Patent Document 8. As the above-described diameter expanding tool, Patent Document 5 and Patent Document 7 have In addition, as a connecting tool for moving the joint main body and the moving sleeve constituting the pipe joint from the separated state to the contact state, it is described in Patent Document 4.

However, when the tube end portion is externally inserted into the inner tube portion of the pipe joint, the pipe end portion is expanded to be larger than the outer diameter of the inner tube portion, and the insertion is easy at the time of insertion. However, in Patent Documents 1 to 8, there is no such description as to expand the diameter.

Even when the pipe end is expanded to be extrapolated larger than the outer diameter of the inner insert portion, there arises a problem of how to make the center of the pipe end coincide with the center of the inner insert portion, and wait until When the inner diameter of the pipe end portion of the naturally reduced diameter is close to the outer diameter of the inner cylindrical portion, although the problem of concentricity is solved, it takes a waiting time to lower the work efficiency.

On the other hand, after the pipe end portion is expanded to the same extent as the outer diameter of the interposing cylinder portion, although there is an extrapolation method, in this case, since it is difficult to insert when the diameter is further reduced, it is necessary to The problem of rushing homework.

The above related patent documents are as follows:

Patent Document 1: Japanese Laid-Open Patent Publication No. 2000-2384 (Fig. 4).

Patent Document 2: Japanese Laid-Open Patent Publication No. Hei 11-230453 (Fig. 1).

Patent Document 3: Japanese Laid-Open Patent Publication No. 2000-220779 (Fig. 1).

Patent Document 4: Japanese Laid-Open Patent Publication No. 2000-263462 (FIG. 1).

Patent Document 5: Japanese Laid-Open Patent Publication No. 2000-37773 (Fig. 18).

Patent Document 6: Japanese Laid-Open Patent Publication No. 2002-349779 (Fig. 4).

Patent Document 7: Japanese Laid-Open Patent Publication No. 2003-25430 (FIG. 2).

Patent Document 8: Japanese Laid-Open Patent Publication No. 2006-336707 (Fig. 5).

The present invention has been made to solve the above problems, and an object of the present invention is to provide an end portion of a pipe joint of a synthetic resin pipe which has been expanded in diameter to be inserted into a pipe portion of a pipe joint without any resistance, and is maintained In a state in which the tube end portion after the diameter expansion and the center of the insertion tube portion are aligned, a synthetic resin tube can be connected, and a tube connection device having high work efficiency can be connected.

The pipe connecting device of the present invention is composed of a synthetic resin pipe, a diameter expanding tool and a pipe joint; after the inner and outer diameters of the pipe end portion of the synthetic resin pipe are forcibly expanded by an external force, the pipe end portion is naturally reduced in diameter, and the diameter is expanded. The tool forcibly expands the inner and outer diameters of the pipe end portion of the synthetic resin pipe which can be naturally reduced in diameter, and the pipe joint connects the pipe end portion of the expanded synthetic resin pipe.

The pipe joint includes an inner cylindrical portion and a moving sleeve, the inner cylindrical portion having an outer diameter larger than an inner diameter of the non-expanding tube of the synthetic resin pipe, and being externally inserted to expand the diameter by the expanding tool In the rear end portion of the tube, the moving sleeve is inserted between the insertion tube portion in order to sandwich the tube end portion which is externally inserted into the insertion tube portion, and the synthetic resin tube is externally inserted into the non-expanded diameter The position of the portion of the synthetic resin tube is slidably moved to an outer position provided at the inner cylindrical portion.

The diameter expanding tool is configured to expand the diameter so that all inner diameters in the axial direction of the tube end portion are larger than an outer diameter of the insertion tube portion, and the synthetic resin tube is configured to be expanded by the expansion In a certain period of time after the diameter tool is expanded, the diameter of the tube can be naturally reduced by inserting the end portion of the tube into the inner tube portion without resistance.

The pipe joint further includes a guiding portion that positions the outer end state of the pipe end portion, and the pipe end portion that is inserted into the outer side of the inner diameter of the inner casing During the period in which the inner tube portion is in close contact with each other, the center of the tube end portion in the expanded diameter state and the center of the inner tube portion are in a state of being aligned, so that the movement can be performed by the movement of the moving sleeve. The outer peripheral edge of the distal end side of the tube end portion that is movably inserted into the outer side of the insertion tube portion in the expanded diameter state.

Therefore, the tube end portion of the expanded synthetic resin tube can be externally inserted into the inner tube portion of the pipe joint without resistance, and the tube end portion of the expanded diameter tube and the center of the inner tube portion can be aligned. The synthetic resin tube can be connected in a state where the work efficiency can be improved.

Further, the pipe connecting device of the present invention is configured such that the inner circumference of the pipe end portion after the diameter reduction contacts the outer circumference of the inner tube portion in a state in which the pipe end portion is positioned by the guide portion. Concentricity with the insertion tube portion is ensured by the outer circumference and the inner circumference of the tube end portion in the axial direction, and the concentricity is further improved.

The effects of the pipe connecting device of the present invention are as described above.

Hereinafter, embodiments of the invention will be described with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a joint main body of an embodiment of a pipe joint of the present invention. (a) a plan view thereof, (b) a cross-sectional front view of one-half thereof, (c) a bottom view thereof, (d) an enlarged AA cross-sectional view of the inner tube portion thereof, and (e) an inner view thereof. An enlarged front view of the insert section.

The joint main body 5 has an outer diameter D3 larger than the inner diameter D1 of the non-expanding tube of the synthetic resin pipe 1, and includes an inner cylindrical portion 2 and a positioning pipe which are externally inserted by the pipe end portion 1a which is expanded by the diameter expanding tool. The guide portion 3 in the externally inserted state of the end portion 1a, the residual thickness accommodating portion 4 for accommodating the residual thickness of the synthetic resin tube at the time of completion of the connection, and the various members 5a to 5d on the side of the synthetic resin tube 1 are not connected. These are integrated and are made of metal (preferably brass or stainless steel, but not limited to these materials) or synthetic resin (preferably in polyphenylene sulfide (PPS) with heat-shrinkable elastic material (TPE), but not inconsistent Limited to these materials) as raw materials.

In the synthetic resin pipe 1, after the inner and outer diameters of the pipe end portion 1a are forcibly expanded by an external force, the pipe end portion 1a is naturally reduced in diameter, and the synthetic resin pipe 1 having various inner and outer diameters and various raw materials according to specifications and the like. However, as exemplified herein, it is generally referred to as a crosslinked polyethylene pipe, and the outer diameter D5 in the non-expanded state is 27.3 mm, the thickness is 4.2 mm, and the inner diameter D0 is 18.9 mm. The raw material is crosslinked polyethylene.

The configuration of the synthetic resin pipe 1 is also such that the diameter of all the inner diameters of the pipe end portion 1a is larger than the outer diameter D3 of the inner cylindrical portion 2 by the diameter expanding tool 20 (Fig. 3) described below (maximum diameter expansion portion) In the length H), the diameter is increased, and the diameter of the diameter-reducing tool 20 is expanded to the depth of the diameter of the diameter-expanding tool 20, and the diameter-diameter portion 1a can be externally inserted into the insertion tube portion 2 without any resistance. .

The interposing cylinder portion 2 is a cylindrical body, and includes a plurality of interposing convex portions 2a constituting a maximum outer diameter D3 thereof, an interpolating concave portion 2b having an outer diameter D2 smaller than the interpolating convex portion 2a, and a synthetic resin tube 1 The inner peripheral portion 2c of the inner tube of the inner diameter D1 having a predetermined inner diameter of the inner diameter D0 of the non-expansion tube.

The foremost end portion of the insertion convex portion 2a is wider than the other insertion convex portions 2a located deeper, and the front end periphery of the tube end portion 1a which is being naturally reduced in diameter is chamfered more smoothly. The outer diameter D2 of the interpolating concave portion 2b is larger than the inner diameter D0 of the synthetic resin tube 1 having no expanded diameter, and finally the tube end portion 1a which is naturally reduced in diameter after expanding the diameter as described below is a gapless contact connection.

In Fig. 1(e), in a state in which the tube end portion 1a is positioned by the guide portion 3, the inner circumference of the tube end portion 1a having the reduced diameter contacts the insertion projection portion 2a of the front end of the insertion tube portion 2 The way to the outside is to form. At this time, the inner diameter D3 of the tube end portion 1a of this portion coincides with the outer diameter D3 of the interpolation convex portion 2a. However, in the portion close to the opening side, the diameter reduction has not progressed much, and there is a gap between the inner diameter of the reduced diameter pipe end portion 1a and the outer circumference of the insertion convex portion 2a on the opening side.

On the other hand, in the state of Fig. 1(e), the outer diameter D6 of the pipe end portion 1a which is naturally reduced in diameter after expansion and the inner diameter D6 of the guide portion 3 coincide with each other, and the expansion portion 3 is made by the guide portion 3 The center of the pipe end portion 1a in the state and the center of the inner insertion tube portion 2 are in a state of being uniform. In other words, in the state of FIG. 1(e), both the center of the pipe end portion 1a in the expanded diameter state and the center of the inner insertion tube portion 2 are in a state of being aligned by both the inner tube portion 2 and the guide portion 3. Both sides are in parallel because of the axis.

The guide portion 3 is formed to extend from the same base end portion as the inner insertion tube portion 2, and is formed by a portion of a quadrant that is equally divided into four, that is, as a peripheral edge of the distal end side of the tube end portion 1a, including The guide inner surface 3a of the inner surface of the protrusion and the inner end 3b of the guide portion which is the inner end of the inner surface of the protrusion. Further, between the projections of the guide portion 3 is a positioning confirmation recess 3c for confirming the state in which the pipe end portion 1a is positioned.

The height H1 of the projection of the guide portion 3, that is, the length H1 from the inner end 3b of the guide portion to the front end portion of the inner surface 3a of the guide portion is the end of the pipe end from the inner end 3b of the guide portion to the maximum diameter portion of the front end portion of the inner tube portion 2. A short dimension of about 1/3 to 1/4 of the length H. Further, the outer diameter of the guide portion 3 is defined as the outer diameter D7 of the guide portion.

The guide portion 3 thus configured is configured such that the tube end portion 1a which is naturally reduced in diameter after the diameter expansion is exactly the outer diameter corresponding to the inner diameter D6 of the inner surface 3a of the guide portion, because the tube end portion 1a in the expanded state The inner diameter is larger than the outer diameter D3 of the inner tube portion 2, and is short. Therefore, the outer diameter of the tube end portion 1a in the expanded diameter state is inserted only along the inner surface 3a of the guide portion, and the tube end portion is inserted. The end face of 1a is in contact with the inner end 3b of the guide portion, and the outer end of the pipe end portion 1a is positioned.

1(e), from the above-described positioning state, the diameter reduction progresses faster from the inner side of the pipe end portion 1a, and as described above, the inner circumference of the pipe end portion 1a after the diameter reduction is reached until the front end of the inner tube portion 2 is contacted. The state of the outer circumference of the convex portion 2a is inserted.

The remaining thickness accommodating portion 4 has the same outer diameter D2 as the interpolating concave portion 2b of the interposing cylinder portion 2, and the outer peripheral side of the tube end portion 1a is externally inserted, and the outer diameter of the tube end portion 1a is externally inserted. In the state of the insertion tube portion 2, the diameter is reduced to the minimum diameter, and in the case where the end surface of the moving sleeve 6 (Fig. 2) contacts the end surface of the guide portion 3 as follows, the inner diameter D4 of the residual thickness generated for accommodation is accommodated. Annular recess.

The intermediate portion 5a is connected to other connected objects in order to connect the above-described interposing cylinder portion 2, the guide portion 3, and the residual thickness accommodating portion 4 for connecting the synthetic resin pipe 1, for connecting the hexagonal body to be described below. The portion 5b, the connecting screw portion 5c, and the main body inner peripheral portion 5d.

The hexagonal portion 5b is a portion for screwing the pipe joint 5 to the connecting member by screwing, and the connecting screw portion 5c is a portion of the internally threaded hole that connects the article by screwing, the inner peripheral portion 5d and the inner portion of the body The inner peripheral portion 2c of the inner insertion cylinder of the insertion tube portion 2 is coaxially communicated.

The inner diameter of the main body inner peripheral portion 5d is larger than the inner diameter of the inner peripheral portion 2c of the inner tube portion so as not to pass through the fluid passing through the inner peripheral portion 2c of the inner tube.

On the side of the joint main body 5 where the synthetic resin pipe 1 is not connected, the intermediate portion 5a for connecting the synthetic resin pipe 1 to the joined article, the hexagonal portion 5b, the connecting screw portion 5c, and the main body inner peripheral portion 5d are collectively referred to as a main body side connection. Department 5f.

Fig. 2 is a view showing a moving sleeve which is combined with a joint main body to constitute a pipe joint. (a) a cross-sectional front view of one-half thereof, (b) a side view thereof, (c) a longitudinal sectional view of a positioning ring interposed in the moving sleeve thereof, and (d) a part of (c) Magnified side view.

The moving sleeve 6 is inserted between the insertion tube portion 2 for inserting the tube end portion 1a which is externally inserted into the insertion tube portion 2 of the joint main body 5, and is inserted from the synthetic resin tube 1 to the non-expanded diameter. A portion of the synthetic resin tube 1 is slidably moved to a position outside the insertion tube portion 2, and is entirely cylindrical, and the material is metal, and brass is particularly preferable, but is not limited to the material.

The outer diameter D7 of the moving sleeve 6 is the same as the outer diameter D7 of the guide portion 3 of the joint main body 5 of the article that is in contact at the time of connection. This is because it is not necessary to provide a step difference between the two in connection, the outer diameter is the same, and the appearance is beautiful, and the outer diameters of the two are not necessarily the same.

The inner diameter D8 of the sleeve inner peripheral portion 6a of the moving sleeve 6 is slightly larger than the outer diameter D5 of the non-expanded synthetic resin tube 1, and is smaller than the inner diameter D6 of the guide portion 3 of the joint main body 5, and is smaller than the inner cylindrical portion. The maximum outer diameter D3 of 2 is large, and is externally inserted into the inner tube portion 2, and is configured to be smaller than the outer diameter of the tube end portion 1a after the diameter reduction.

An inclined opening portion 6c is provided on the side closer to the pipe end portion 1a of the moving sleeve 6 which is expanded in the state of being inserted into the synthetic resin pipe 1, and the diameter expansion start portion and the diameter expansion of the pipe end portion 1a are provided. Part of the pressurized contact becomes smooth.

An annular receiving groove 6b is provided in the inner peripheral portion of the moving sleeve 6 at a predetermined distance from the end opposite to the inclined opening portion 6c, and the annular receiving groove 6b accommodates FIGS. 2(c) and (d). The stop ring 6e is shown.

The snap ring 6e is an annular body made of a resilient synthetic resin (particularly preferably polyethylene (PE), but not limited to the material), and is housed in the annular receiving groove 6b as a whole, and has a ring inner peripheral portion 6g. It is not a portion that protrudes toward the moving sleeve 6. That is, the inner diameter of the inner circumferential portion 6g of the ring is equal to or larger than the inner diameter D8 of the inner circumferential portion 6a of the sleeve.

On the other hand, the sleeve inner peripheral portion 6a is provided with a stopper portion 6f that protrudes in the arcuate center direction when the sleeve inner peripheral portion 6a is formed as a circle. The apparent inner diameter of the stopper portion 6f (the inner diameter of the tangential circle of the stopper portion 6f) is smaller than the inner diameter D8 of the sleeve inner peripheral portion 6a, but the elasticity corresponds to the outer circumference of the synthetic resin tube 1 having no expanded diameter. And flexible contact.

Due to such a configuration, when the moving sleeve 6 is externally inserted into the non-expanded synthetic resin tube 1, it can be slidably moved by a human hand, but even if the hand is released, it does not slide by the self-weight relative to the synthetic resin tube 1. To play the effect of the stop. In addition, the joint main body 5 of FIG. 1 and the moving sleeve 6 of FIG. 2 are combined into a pipe joint 10.

Fig. 3 is a view showing an embodiment of the diameter expanding tool of the present invention. (a) is the front view, (b) is the front view of (a), (c) is the longitudinal section of (a), (d1), (d2)-(f1), (f2) are detachable respectively Side view and front view of the three enlarged diameter sections exchanged.

The basic configuration of the diameter-expanding tool 20 is the same as that described in Patent Document 7, and the feature of the diameter-expanding tool 20 that is not described in Patent Document 7 is different from the configuration described in Patent Document 7 in that the diameter is expanded. There is a certain relationship between the lengths B1-B3 of the portions and the outer diameters C1-C3 of the enlarged diameter portions 14-15B.

When the expansion tool 20 repeatedly performs the operation of bringing the operation handle 11 close to or away, the enlarged diameter core 13 having the conical top portion irreversibly moves in the right direction stepwise in accordance with FIG. 3(a), and thus is composed of six parts. The outer diameter of the enlarged diameter portion 14 is sequentially enlarged, and the pipe end portion 1a of the synthetic resin pipe 1 is expanded in diameter.

When the control lever 12 is rotated in the state shown by the double-dotted line in Fig. 5(c), the spring that is built in the enlarged diameter core 13 returns to the original position, and the outer diameter of the enlarged diameter portion 14 is restored to the original outer position. path.

Here, according to the diameter expansion tool 20 shown in FIGS. 3(a)-(c), (d1), and (d2), the diameter-expanding portion has a length B1, and according to the diameter-enlarged portion 14 of the diameter-enlarged portion outer diameter C1, The pipe end portion 1a of the synthetic resin pipe 1 can be expanded in diameter so as to be suitable for connecting the pipe joint 10 shown in Figs.

In other words, the diameter-enlarged portion 14 has a smaller outer diameter C1 than the inner diameter D0 of the synthetic resin tube 1 having no diameter expansion, so that the tube end portion 1a can be easily inserted and the tube end portion 1a can be expanded. In a state in which the outer diameter corresponds to the inner surface 3a of the guide portion of the guide portion 3 of the joint main body 5, it can be externally inserted into the inner tube portion 2 without resistance, and the end surface of the tube end portion 1a contacts the inner end portion 3b of the guide portion. The extrapolated state of the tube end 1a can be easily positioned. This is specifically described below with reference to FIG. 6.

Further, the above-described synthetic resin pipe 1, the pipe joint 10 composed of the joint main body 5 and the moving sleeve 6, and the expansion tool 20 are collectively referred to as a pipe connecting device 50. Further, the enlarged diameter portions 14A and 14B respectively correspond to synthetic resin tubes having different inner and outer diameters, and are respectively formed in four parts.

Fig. 4 is a view showing an embodiment of the connecting tool of the present invention. (a) is a plan view, (b) is a front view, and (c) is a longitudinal cross-sectional view showing the internal mechanism.

This connection tool 30 is the same as the tool described in Patent Document 4. After the synthetic resin tube 1 expanded in diameter by the tube end portion 1a of the expansion tool 20 of Fig. 3 is externally inserted and positioned in the joint main body 5 of Fig. 1, the outer sleeve is inserted into the tube end portion 1a, and the moving sleeve 6 is moved. The moving sleeve 6 is located outside the insertion tube portion 2 so as to be moved relative to the joint main body 5, so that the front end of the moving sleeve 6 moves in contact with the end surface of the guide portion 3.

To this end, the connecting tool 30 includes two pressing portions 21A contacting the main body side of the end face of the intermediate portion 5a of the joint main body 5 on the side of the insertion cylindrical portion 2, and the opposite end to the tube end portion 1a contacting the moving sleeve 6. Two extruded portions 21B on the sleeve side of the end face. By operating the operating handle 22, the two pressing portions 21B on the sleeve side can be moved close to each other in a state in which both of them are parallel with respect to the two pressing portions 21A on the main body side.

Further, the connecting tool 30 has a ratchet mechanism built therein to irreversibly achieve the above-described approach movement. However, the ratchet release mechanism is also built in, and after the completion of the movement, it can be restored to the original open state.

Thereby, the synthetic resin pipe is expanded by the expansion tool 20, the pipe end portion 1a whose diameter is expanded is externally inserted into the joint main body 5, and the moving sleeve 6 is moved by the joint tool 30 to form a synthetic resin pipe. 1 is connected to the pipe joint 10, and its state change is explained using Figs.

(a), (b), and (c) of FIG. 5 are explanatory views sequentially showing changes in the diameter-expanded state of the pipe end portion of the synthetic resin pipe using the diameter expanding tool of the present invention. The same reference numerals are given to the parts that have been described above, and the repeated description is omitted.

First, as shown in Fig. 5 (a), the movable sleeve 6 is inserted into the synthetic resin tube 1 having no diameter expansion so that the inclined opening portion 6c side is the tube end portion 1a, and the expanding tool 20 is prepared.

Next, as shown in Fig. 5(b), in the state in which the moving sleeve 6 is externally inserted, the tube end portion 1a having no diameter expansion is externally inserted into the enlarged diameter portion 14 of the smallest diameter state of the expanding tool 20.

Next, as shown in FIG. 5(c), when the operation of the operation handle 11 of the diameter expanding tool 20 is repeated, the pipe end portion 1a is expanded in diameter so as to reach the inner and outer diameters satisfying the above conditions. Here, when the control lever 12 is rotated in the direction indicated by the double dotted line, the irreversible locking is released, the enlarged diameter portion 14 is restored to the minimum diameter state, and the synthetic resin tube after the pipe end portion 1a is expanded can be removed. 1, and the connection process with the pipe joint 10 of FIG. 6 can be performed.

6(a) to 6(d) are longitudinal cross-sectional views showing, in order, a state in which a synthetic resin pipe having an enlarged diameter of a pipe end portion is connected to a pipe joint.

First, as shown in Fig. 6(a), when the diameter is naturally reduced, and the outer diameter of the pipe end portion 1a reaches a diameter corresponding to the inner surface 3a of the guide portion of the guide portion 3 of the joint main body 5, the pipe end portion In the state of 1a along the inner surface 3a of the guide portion, the tube end portion 1a is externally inserted into the inner tube portion 2 until the end surface of the tube end portion 1a contacts the inner end portion 3b of the guide portion. Therefore, the positioning of the extrapolated state of the tube end portion 1a is achieved.

At this time, as shown in Fig. 6(a), there is a gap between the inner circumference of the pipe end portion 1a in the expanded diameter state and the outer circumference of the inner insertion cylinder portion 2, and the insertion tube portion 2 is inserted into the pipe end portion 1a without resistance. The tube end 1a is easily positioned and extrapolated with respect to the joint body 5. Further, during this period, the center of the tube end portion 1a and the center of the insertion tube portion 2 are kept in a state of being in contact with each other by the contact of the guide inner surface 3a of the guide portion 3 and the outer circumference of the tube end portion 1a.

Further, in the state of FIG. 6(a), it is not necessary to wait for further natural reduction of the diameter, and as shown in FIGS. 6(c) and (d), the moving sleeve 6 is moved into contact with the joint main body 5 by the joint tool 30, and the completion is completed. Connection, in this case, improve work efficiency.

Next, as time passes, as shown in Fig. 6(b), the tip end of the pipe end portion 1a is reduced in diameter from the back side of the pipe end portion 1a while being in contact with the guide portion inner surface 3a of the guide portion 3, and the pipe end The inner surface of the portion 1a is in a state of being in contact with the insertion convex portion 2a at the distal end of the insertion tube portion 2. Therefore, the concentricity of the joint main body 5 and the pipe end portion 1a is ensured at two places in the axial direction, and the synthetic resin pipe 1 is connected to the joint main body 5 in a better concentric state.

Next, as shown in FIG. 6(c), the joint main body 5 and the moving sleeve 6 are clamped by the two pressing portions 21A on the main body side of the joint tool 30 and the two pressing portions 21B on the sleeve side, and are connected by When the tool 30 is operated, when the two pressing portions 21B on the sleeve side move and approach the two pressing portions 21A on the main body side, the connection between the two is completed as shown in Fig. 6(d).

Thus, according to the pipe connecting device 50, the pipe end portion 1a of the expanded synthetic resin pipe 1 can be externally inserted into the inner tube portion 2 of the pipe joint 10 without any resistance, and can be expanded at the pipe end. When the two portions of the portion 1a and the inner insertion tube portion 2 are aligned, the synthetic resin tube is connected, and work efficiency can be improved.

Further, in the process of FIGS. 6(a) and (b), in the outer diameter state corresponding to the pipe end portion 1a of the expanded synthetic resin pipe 1 and the guide inner surface 3a of the guide portion 3, the slave pipe is included. The outer diameter of the end portion 1a is slightly larger than the inner surface 3a of the guide portion, but the outer diameter of the tube end portion 1a is smaller than the inner surface 3a of the guide portion by the state of being pressed by the human hand, but is smaller than the inner diameter D4 of the inner end 3b of the guide portion. The large state (predetermined by the extrapolation reference of the tube end 1a).

In a certain period of time during which the natural diameter reduction is performed, since the inner diameter of the tube end portion 1a can be maintained larger than the outer diameter D3 of the inner tube portion 2, the tube end portion 1a can be inserted into the inner tube portion 2 without resistance. Therefore, it is possible to perform the extrapolation to the joint main body 5 of the pipe end portion 1a without rushing, thereby improving the operability.

In addition, as shown in FIG. 6(b), in the state in which the inner side of the inner diameter of the pipe end portion 1a contacts the innermost insertion convex portion 2a of the inner tube portion 2, even the outer periphery of the front end side of the pipe end portion 1a is provided. The diameter reduction of the degree of void generation is performed with respect to the inner surface 3a of the guide portion of the guide portion 3, since the extrapolation positioning of the tube end portion 1a has been achieved by the contact of the end faces of the tube end portion 1a of the inner end 3b of the guide portion, after the diameter expansion The concentricity of the tube end portion 1a and the inner insertion tube portion 2 is maintained by the contact between the inner and outer surfaces of the both, so that there is no problem.

Therefore, according to the pipe connecting device 50 of the present invention, the pipe end portion 1a has more time after the diameter is expanded, and the pipe end portion 1a can be externally positioned without resistance, thereby improving the operability.

In other words, according to the above-described pipe connecting device 50, the pipe joint 10 includes a guide portion 3 which positions the expanded state of the pipe end portion 1a and is movably inserted into the outer side of the inner cylindrical portion 2 without resistance. When the pipe end portion 1a is in a state in which the pipe end portion 1a is in a state of being in a state of being in a state in which the pipe end portion 1a of the diameter-enlarged state and the center of the interposing tube portion 2 are in a state of being in a state of being in a state of being in a state of being in a state of being in a state in which the pipe end portion 1a is in close contact with By the movement of the moving sleeve 6, the outer peripheral edge of the distal end side of the tube end portion 1a in the expanded diameter state which is movably inserted outside the insertion tube portion 2 can be said. Play the above effects.

Further, in the pipe connecting device 50 of the present invention, after the distal end side of the pipe end portion 1a which is reduced in diameter after the diameter expansion is expanded, the insertion portion 3 is externally inserted and positioned without resistance by the guide portion 3, The concentricity of the inner side of the pipe end portion 1a which is reduced in diameter after the diameter expansion is maintained, and the connection of the pipe joint 10 of the synthetic resin pipe 1 which is moved by the moving sleeve 6 can be realized with good operation, and the use is skillfully utilized. The state of the natural reduced diameter of the synthetic resin pipe 1 after the diameter expansion is changed.

Fig. 7 is a view showing another embodiment of the joint main body of the pipe joint of the present invention. (a) is a top view of the plan view, (b) its front view, (c) a half of its cross section, and (d) its external perspective view.

The joint main body 5A is different from the joint main body 5 of FIG. 1 in that the intermediate portion 5g is centered, and the interposing cylinder portion 2A and the guide portion 3A are provided in the opposing direction through the coaxial center for synthetic resin. The tubes 1 are connected to each other. The same moving sleeve 6 as in Fig. 2 was used.

Further, the difference is that the guide portion 3A is provided at two positions facing each other in the circumferential direction, the guide portion inner surface 3d is constituted by a flat surface, and the guide portion inner end 3e is formed of a prismatic shape and an arc-shaped member. Further, the positioning confirmation recess 3f corresponds to the positioning confirmation recess 3c of the guide portion 3 of the joint main body 5 of Fig. 1 .

However, according to the pipe connecting device including the joint main body 5A, the configuration and main portions of the pipe connecting device 10 are the same. It can be seen that the same effect as the pipe connecting device 10 can be exhibited.

Further, the inner surface 3d of the guide portion is only two places facing each other, and although concentricity in a direction perpendicular to the inner surface 3d of the guide portion is not secured, the insertion and positioning of the end portion 1a of the inner end 3e of the guide portion is realized. Thereafter, since the concentricity between the inner circumference of the tube end portion 1a and the outer circumference of the inner tube portion 2A is ensured, there is no problem in this respect.

Fig. 8 is a view showing another embodiment of the diameter expanding tool of the present invention. (a) its side view and (b) its main view.

The basic diameter of the diameter-expanding tool 20A is the same as that of the tool described in Patent Document 5. The difference between the patent document 5 and the feature of the expansion tool 20A is that the diameter-expanding portion is different from that described in Patent Document 5. The lengths B4 and B5 and the outer diameters C4 and C5 of the enlarged diameter portions 14C and D have a certain relationship.

When the operating handle 11A is brought close to each other, the distance between the respective portions of the enlarged diameter portions 14C and D which are divided into two parts by the link mechanism is increased, and the pipe end portion of the synthetic resin pipe is expanded in diameter. However, the relationship between the lengths B4 and B5 of the enlarged diameter portion and the outer diameters C4 and C5 of the enlarged diameter portions 14C and D is the same as that of the diameter expanding tool 20, and exhibits the same effect.

Further, according to the diameter expansion tool 20, since the diameter-enlarged portions 14C and D are divided into two parts, only the diameter of the synthetic resin tube can be increased in one direction, but in the diameter-expanded state, if the synthetic resin is used The tube end portion of the tube and the enlarged diameter portions 14C and D are relatively rotated, and the diameter can be expanded over the entire circumference of the tube end portion of the synthetic resin tube.

Further, in the case of connecting the joint main body 5A having only the guide portions 3A opposite to each other as illustrated in Fig. 7, the diameter is expanded only in the direction corresponding to the inner surface 3d of the guide portion, and other portions may exceed The degree of expansion of the outer diameter of the inner cylindrical portion 2A is increased, and in this case, time consuming operation of expanding the diameter of the portion can be omitted.

Further, the pipe connecting device of the present invention is not limited to the above-described embodiments, and various modifications and combinations are possible within the scope of the patent claims and the scope of the embodiments, and such modifications and combinations are also included in the scope of the claims.

For example, the number of the guide portions is two and four, but it may be three or five.

The pipe connecting device of the present invention can externally insert the pipe end portion of the expanded synthetic resin pipe into the inner tube portion of the pipe joint without any resistance, and can further enlarge the diameter of the pipe end portion and the inner insert cylinder The synthetic resin tube is connected in a state in which the two centers of the part are connected, and it can be applied to an industrial field related to pipe connection in which work efficiency is required to be improved.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of the claims is intended to be limited to the above embodiments.

1. . . Synthetic resin tube

1a. . . Tube end

2, 2A. . . Inner tube

2a. . . Interpolating convex

2b. . . Interpolating recess

2c. . . Inner circumference

3. . . Guide

3a. . . Inner surface of the guide

3b. . . Inside the guide

3c. . . Notch

4. . . Residual thickness housing

5, 5A. . . Connector body

5a. . . Middle part

5b. . . Hexagon

5c. . . Connecting thread

5d. . . Inner circumference of the main body

5f. . . Main body side connection

5g. . . Middle part

6. . . Moving sleeve

6a. . . Inner circumference of the sleeve

6b. . . Annular storage slot

6c. . . Inclined opening

6e. . . Stop ring

6f. . . Stop

10. . . Pipe joint

11, 22. . . Operating handle

12. . . Controller

14A, 14B, 14C, 14D. . . Expansion section

20, 20A. . . Expansion tool

21A, 21B. . . Extrusion

30. . . Connection tool

50. . . Pipe connection device

D0, D1, D8. . . the inside diameter of

D2, D3, D5, D6, D7. . . Outer diameter

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a joint main body of an embodiment of a pipe joint according to the present invention; (a) a plan view thereof, (b) a cross-sectional front view of one half thereof, (c) a bottom view thereof, and (d) The enlarged AA cross-sectional view of the interposer portion and (e) is an enlarged front view of the interposing cylinder portion.

Fig. 2 is a view showing a moving sleeve which is combined with a joint main body to constitute a pipe joint; (a) a cross-sectional front view of one half thereof, (b) a side view thereof, and (c) an inner sleeve inserted therein The longitudinal cross-sectional view of the positioning ring and (d) are enlarged side views of a part of (c).

Figure 3 is a view showing an embodiment of the diameter expanding tool of the present invention; (a) its front view, (b) its front view, (c) a longitudinal section of (a), (d1), (d2)- (f1) and (f2) are respectively a side view and a front view of three types of enlarged diameter portions that are detachably exchanged.

Fig. 4 is a view showing an embodiment of the connecting tool of the present invention; (a) is a plan view thereof, (b) is a front view thereof, and (c) is a longitudinal sectional view showing an internal mechanism thereof.

(a), (b), and (c) of FIG. 5 are explanatory views sequentially showing changes in the diameter-expanded state of the pipe end portion of the synthetic resin pipe using the diameter expanding tool of the present invention.

6(a) to 6(d) are longitudinal cross-sectional views showing, in order, a state in which a synthetic resin pipe having an enlarged diameter of a pipe end portion is connected to a pipe joint.

Fig. 7 is a view showing another embodiment of the joint main body of the pipe joint of the present invention. (a) is a top view of the plan view, (b) its front view, (c) a half of its cross section, and (d) its external perspective view.

Fig. 8 is a view showing another embodiment of the diameter expanding tool of the present invention. (a) its side view and (b) its main view.

1. . . Synthetic resin tube

1a. . . Tube end

3. . . Guide

4. . . Residual thickness housing

5. . . Connector body

6. . . Moving sleeve

10. . . Pipe joint

21A. . . Extrusion

21B. . . Extrusion

30. . . Connection tool

50. . . Pipe connection device

Claims (2)

A pipe connecting device is composed of a synthetic resin pipe, an expanding pipe tool and a pipe joint; after the inner and outer diameters of the pipe end portion of the synthetic resin pipe are forcibly expanded by an external force, the pipe end portion is naturally reduced in diameter, and the pipe diameter is expanded. The tool forcibly expanding the inner and outer diameters of the pipe end portion of the synthetic resin pipe which can be naturally reduced in diameter, the pipe joint connecting the pipe end portion of the expanded synthetic resin pipe; wherein the pipe joint includes interpolation a cylindrical portion and a moving sleeve having an outer diameter larger than an inner diameter of the non-expanding tube of the synthetic resin tube, and being externally inserted into a tube end portion expanded by the expanding tool The moving sleeve is inserted between the inner tube portion and the tube end portion of the inner tube portion, and the synthetic resin tube is externally inserted into the synthetic resin tube of the non-expanded portion. The position is slidably moved to an outer position provided at the inner tube portion; the diameter expanding tool is expanded in such a manner that all inner diameters of the tube end portion are larger than the outer diameter of the inner tube portion Constructed; the synthetic resin tube is naturally reduced in diameter shortly after being expanded by the expanding tool For a certain period of time, the tube end portion can be externally inserted into the inner tube portion without resistance; and the pipe joint further includes a guiding portion, and the guiding portion positions the extrapolating state of the tube end portion a pipe end which is inserted into the outer side of the insertion tube portion without resistance and which is inserted into the outer diameter of the inner tube The center of the portion and the center of the inner tube portion are in a state of being aligned, and can be clamped by the movement of the moving sleeve, and disposed in an expanded state that is movably inserted outside the inner tube portion The outer periphery of the front end side of the tube end. The pipe connecting device according to claim 1, wherein the inner circumference of the pipe end portion after the diameter reduction is in contact with the outer circumference of the inner tube portion in a state in which the pipe end portion is positioned by the guide portion Way to constitute.