JP5426972B2 - Pipe connection device and pipe joint - Google Patents

Description

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

  As the pipe joint and the synthetic resin pipe as described above, there are those described in Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 6, and Patent Document 8, and as a diameter expansion tool as described above, As a connection tool for moving a joint main body and a moving sleeve constituting a pipe joint from a separated state to a contact state for connection, there are those described in Patent Document 5 and Patent Document 7; There is what is described in 4.

  However, when the pipe end is extrapolated to the insertion tube portion of the pipe joint, it is easier to insert the tube end portion by enlarging the tube end portion with a diameter sufficiently larger than the outer diameter of the insertion tube portion. However, in any of Patent Documents 1 to 8, there is no description of such diameter expansion.

  However, if the tube end is extrapolated with a diameter sufficiently larger than the outer diameter of the inner tube, how to match the center of the tube end with the center of the tube If there is a problem and the system waits until the inner diameter of the tube end portion that is naturally reduced in diameter is close to the outer diameter of the insertion tube portion, the concentricity problem is solved, but there is a waiting time and work efficiency is poor.

  On the other hand, there is a method of extrapolating the tube end after expanding the tube end to the same diameter as the outer diameter of the inner tube portion. There was a problem of not becoming.

JP 2000-2384 A (FIG. 4) Japanese Patent Laid-Open No. 11-230453 (FIG. 1) Japanese Patent Laid-Open No. 2000-220779 (FIG. 1) JP 2000-263462 A (FIG. 1) JP 2000-37773 A (FIG. 18) JP 2002-349779 A (FIG. 4) Japanese Patent Laying-Open No. 2003-25430 (FIG. 2) JP 2006-336707 A (FIG. 5)

  The present invention is intended to improve the above problem, and the pipe end portion of the expanded synthetic resin pipe can be extrapolated to the insertion tube portion of the pipe joint without resistance, and the diameter is expanded in that state. It is an object of the present invention to provide a pipe connecting device that can connect a synthetic resin pipe in a state in which both the centers of the pipe end portion and the insertion tube portion coincide with each other, and has high work efficiency.

The pipe connecting device according to the present invention includes a synthetic resin pipe in which the inner and outer diameters of the pipe ends are forcibly expanded by an external force, and the inner and outer diameters of the pipe ends of the synthetic resin pipes. A pipe connecting device comprising a diameter expanding tool forcibly expanding the diameter so that the diameter can be naturally reduced, and a pipe joint to which a pipe end of the expanded synthetic resin pipe is connected,
The pipe joint has an outer diameter larger than an inner diameter of a non-expanded pipe of the synthetic resin pipe, and an insertion cylinder portion into which a pipe end portion expanded by the diameter expansion tool is extrapolated, and the insertion In order to sandwich the tube end portion extrapolated to the cylindrical portion with the inner cylindrical portion, it is arranged outside the inner cylindrical portion from the position extrapolated to the synthetic resin pipe in the non-diameter expanded portion. A moving sleeve that slides along the synthetic resin tube to a position;
The diameter expansion tool is configured to increase the inner diameter of the entire region in the axial direction of the tube end so as to be larger than the outer diameter of the insertion tube portion, and the synthetic resin tube The fixed time immediately after the diameter expansion by the tool is configured to naturally reduce the diameter so that the tube end portion can be extrapolated without resistance to the insertion tube portion,
The pipe joint has a diameter-expanded tube until the pipe end immediately after diameter expansion, which is loosely inserted without resistance in the outer side of the insertion tube portion, comes into close contact with the insertion tube portion due to natural diameter reduction. A tube end portion in a diameter-expanded state loosely inserted on the outer side of the insertion tube portion so as to be able to be clamped by movement of the moving sleeve in a state where the center of the end portion and the center of the insertion tube portion coincide with each other Since it is further provided with a guide portion that is disposed on the periphery of the outer periphery of the distal end side and positions the extrapolated state of the tube end portion,
The pipe end of the expanded synthetic resin pipe can be extrapolated to the insertion tube part of the pipe joint without resistance, and both centers of the pipe end part and the insertion tube part expanded in that state are Synthetic resin pipes can be connected in a matched state, and work efficiency can be improved.

  In addition, the pipe connection device of the present invention is configured such that the inner circumference of the pipe end portion having a reduced diameter comes into contact with the outer circumference of the insertion tube portion in a state where the pipe end portion is positioned by the guide portion. Concentricity with the inner tube portion is ensured between the outer periphery and the inner periphery of the tube end portion that are moved back and forth in the axial direction, and the concentricity is further improved.

  The effect of the pipe connecting device of the present invention is as described in the above means.

The joint main body of an example of the pipe joint of this invention is shown, (a) is the top view, (b) is the front view of the half section, (c) is the bottom view, (d) Enlarged AA cross-sectional view of the insertion cylinder, (e) is an enlarged front view of the insertion cylinder The moving sleeve which comprises a coupling main body and comprises a pipe joint is shown, (a) is the front view of the half cross section, (b) is the side view, (c) is inserted in the moving sleeve. (D) is a partially enlarged side view of (c). An example of the diameter expansion tool of this invention is shown, (a) is the front view, (b) is the front view of (a), (c) is a longitudinal cross-sectional view of (a), (d1) , (D2) to (f1), (f2) are a side view and a front view of three types of enlarged diameter portions that can be attached and detached respectively. An example of the connection tool of this invention is shown, (a) is the top view, (b) is the front view, (c) is a longitudinal cross-sectional view which shows the internal mechanism. (A), (b), (c) is explanatory drawing which shows in order the diameter expansion aspect of the pipe end part of the synthetic resin pipe | tube by the diameter expansion tool of this invention. (A)-(d) is a longitudinal cross-sectional view which shows in order the aspect which connects the synthetic resin pipe | tube with which the pipe end part was expanded to a pipe joint. The other example of the coupling main body of the pipe coupling of this invention is shown, (a) is the top view, (b) is the front view, (c) is the partial front view of the half section, (d) Is an external perspective view The other example of the diameter expansion tool of this invention is shown, (a) is the side view, (b) is the front view.

  Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1

  FIG. 1 shows a joint body of an example of the pipe joint of the present invention, in which (a) is a top view thereof, (b) is a front view of a half section thereof, (c) is a bottom view thereof, d) is an enlarged AA cross-sectional view of the insertion tube portion, and (e) is an enlarged front view of the insertion tube portion.

  This joint main body 5 has an outer diameter D3 larger than the inner diameter D1 of the non-expanded pipe of the synthetic resin pipe 1, and an insertion tube section 2 into which the pipe end 1a expanded by the diameter expansion tool is extrapolated. The guide part 3 for positioning the extrapolated state of the pipe end 1a, the surplus part accommodating part 4 for accommodating the surplus of the synthetic resin pipe when the connection is completed, and the various parts 5a on the side where the synthetic resin pipe 1 is not connected. 5d, they are integrated, metal (brass or stainless steel is preferred, but not limited to) or synthetic resin (polyphenylene sulfide (PPS) with thermoplastic elastomer (TPE) added) However, the material is not limited to this.).

  The synthetic resin tube 1 is a tube in which the tube end 1a is naturally reduced after the inner and outer diameters of the tube end 1a are forcibly expanded by an external force. However, what is exemplified here is generally called a cross-linked polyethylene pipe, and the non-expanded outer diameter D5 is 27.3 mm, the wall thickness is 4.2 mm, the inner diameter D0 is 18.9 mm, The material is cross-linked polyethylene.

  Further, the synthetic resin pipe 1 has an inner diameter in the entire axial direction of the pipe end portion 1a larger than the outer diameter D3 of the insertion tube portion 2 (with the largest diameter-expanded portion) by a diameter expansion tool 20 (FIG. 3) described later. The diameter is naturally reduced so that the pipe end 1a can be extrapolated without resistance to the insertion tube part 2 for a certain period of time immediately after the diameter expansion by the diameter expansion tool 20 so as to increase the diameter so as to be the length H). It is configured as follows.

  The insertion cylinder part 2 is a cylindrical body, a plurality of insertion convex parts 2a constituting the maximum outer diameter D3, and an insertion concave part 2b having a smaller outer diameter D2 between the insertion convex parts 2a, And an insertion cylinder inner peripheral portion 2c having an inner diameter D1 larger than the inner diameter D0 of the non-expanded pipe of the synthetic resin pipe 1 by a predetermined amount.

  The leading edge of the insertion convex part 2a is wider than the other insertion convex part 2a located deeper than the other, and the chamfer for smoothly receiving the pipe end part 1a that is naturally reduced in diameter at the front end edge thereof. Has been. The outer diameter D2 of the insertion recess 2b is larger than the inner diameter D0 of the non-expanded synthetic resin tube 1, and the tube end portion 1a that has been naturally reduced after the expansion is finally brought into pressure contact as described later.

  In FIG. 1 (e), with the tube end 1 a positioned by the guide portion 3, the inner circumference of the reduced tube end 1 a contacts the outer circumference of the insertion convex portion 2 a at the tip of the insertion tube portion 2. In this case, the inner diameter D3 of the tube end portion 1a of this portion coincides with the outer diameter D3 of the insertion convex portion 2a. There is a gap between the inner diameter of the pipe end portion 1a that has not progressed and has a reduced diameter and the outer periphery 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 that has been naturally reduced after the diameter expansion coincides with the inner diameter D6 of the guide portion 3. The center of the tube end portion 1a and the center of the insertion tube portion 2 are aligned. That is, in the state of FIG. 1 (e), the center of the tube end portion 1 a in the expanded state and the center of the insertion tube portion 2 are matched in both the insertion tube portion 2 and the guide portion 3. Both are in a parallel state with the same axis.

  The guide portion 3 is formed as a partial protrusion that extends from the same base end portion as the insertion tube portion 2 and divides the circumference into four equal parts, that is, the peripheral edge of the outer periphery on the distal end side of the tube end portion 1a. The guide inner surface 3a, which is the inner surface of the projection, and the guide inner end 3b, which is the innermost end of the projection, are provided. Further, between the protrusions of the guide portion 3 is a positioning confirmation concave window 3c for confirming the state where the tube end portion 1a is positioned.

  The height H1 of the protrusion of the guide portion 3, that is, the length H1 from the guide back end 3b to the tip end portion of the guide inner surface 3a is the tube end from the guide back end 3b to the tip maximum diameter portion of the insertion tube portion 2. The length is about 1/3 to 1/4 of the insertion length H. In addition, let the outer diameter of the guide part 3 be the guide part outer diameter D7.

  The guide portion 3 having such a configuration has a diameter of the tube end portion 1a in the expanded state when the tube end portion 1a that is naturally reduced in diameter after being expanded to the inner diameter D6 of the guide inner surface 3a has a corresponding outer diameter. Since the inner diameter is larger than the outer diameter D3 of the inner insertion cylinder portion 2 and is shorter, the inner diameter of the pipe end portion 1a in the expanded state is aligned with the inner surface 3a of the guide just by inserting it a little. The end face of the tube end 1a is in contact with the back end 3b of the guide, and the extrapolated state of the tube end 1a is positioned.

  In FIG. 1 (e), from the above-mentioned positioning state, the diameter of the pipe end 1a further advances from the inner side of the pipe end 1a earlier. The state which came to contact the outer periphery of the insertion convex part 2a of the front-end | tip of is shown.

  The extra-wall housing part 4 has the same outer diameter D2 on the inner peripheral side as that of the insertion concave part 2b of the inner insertion cylinder part 2, and the outer peripheral side thereof has completed the connection of the pipe end part 1a. When the outer diameter of the movable sleeve 6 is reduced to the minimum diameter in a state of being inserted into the insertion tube portion 2 and the end surface of the moving sleeve 6 (FIG. 2) contacts the end surface of the guide portion 3 as will be described later. It is a ring-shaped recess having an inner diameter D4 that accommodates meat.

  The intermediate part 5a is for connecting the above-described insertion tube part 2, the guide part 3, and the extra-wall housing part 4 for connecting the synthetic resin pipe 1 to another connection object. Further, it is for connecting to a hexagonal portion 5b, a connecting screw portion 5c, and a main body inner peripheral portion 5d described below.

  The hexagonal portion 5b is a portion for applying a spanner for screwing the pipe joint 5 to the connection target, and the connection screw portion 5c is screwed into the female screw hole to be connected. The part 5d communicates coaxially with the inner peripheral part 2c of the insertion cylinder part 2 of the insertion cylinder part 2.

  The inner diameter of the inner peripheral part 5d is larger than the inner diameter of the inner cylinder inner peripheral part 2c, and does not hinder the passage of the fluid passing through the inner cylinder inner peripheral part 2c.

  The intermediate portion 5a, the hexagonal portion 5b, the connecting screw portion 5c, and the inner peripheral portion 5d for connecting the synthetic resin tube 1 to the connection target on the side of the joint body 5 where the synthetic resin tube 1 is not connected. Are collectively referred to as a main body side connecting portion 5f.

  FIG. 2 shows a moving sleeve which forms a pipe joint in combination with a joint body. (A) is a front view of a half section thereof, (b) is a side view thereof, and (c) is a movement thereof. The longitudinal cross-sectional view of the retaining ring inserted in a sleeve, (d) is a partially expanded side view of (c).

  The movable sleeve 6 is externally attached to the non-diameter expanded portion of the synthetic resin tube 1 so as to hold the tube end portion 1a externally inserted into the internal tube portion 2 of the joint body 5 with the internal tube portion 2. It is slid along the synthetic resin tube 1 from the inserted position to a position arranged outside the insertion tube portion 2, and is generally cylindrical, and is preferably made of metal, particularly brass. However, it is not limited to this 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 body 5 that contacts the connecting sleeve 6. This is because it is not particularly necessary to provide a step between the two, especially when they are connected, and it is better to have the same outer diameter in appearance. It is not a thing.

  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 smaller than the inner diameter D6 of the guide portion 3 of the joint body 5, and It is configured to be larger than the maximum outer diameter D3, and to be smaller than the outer diameter of the tube end portion 1a that is extrapolated to the inner insertion tube portion 2 and has a maximum diameter reduction.

  An inclined opening 6c is provided on the side of the movable sleeve 6 that comes into contact with the pipe end 1a that has been expanded in a state of being externally attached to the synthetic resin pipe 1, and a diameter expansion start portion of the pipe end 1a is provided. In addition, the pressure contact with the enlarged diameter portion is generated smoothly.

A ring receiving groove 6b is provided on the inner peripheral portion of the moving sleeve 6 at a predetermined distance from the end opposite to the inclined opening 6c. The ring receiving groove 6b has a ring receiving groove 6b shown in FIGS. The retaining ring 6e shown in FIG.

  The retaining ring 6e is a ring body made of an elastic synthetic resin (especially polyethylene (PE) is preferable, but not limited to this), and the whole is accommodated in the ring accommodating groove 6b. The ring inner peripheral portion 6 g does not protrude into the moving sleeve 6. That is, the inner diameter of the ring inner peripheral portion 6g is equal to or larger than the inner diameter D8 of the sleeve inner peripheral portion 6a.

  On the other hand, the sleeve inner peripheral portion 6a is provided with a retaining portion 6f which is a protruding portion in the center direction of the chord shape when the sleeve inner peripheral portion 6a is partially formed into a circle. The apparent inner diameter of the retaining portion 6f (the inner diameter of a circle tangent to the retaining portion 6f) is smaller than the inner diameter D8 of the sleeve inner peripheral portion 6a, but corresponds to the outer periphery of the non-expanded synthetic resin tube 1 due to its elasticity. Then flex and touch.

  With such a configuration, when the moving sleeve 6 is extrapolated to the non-expanded synthetic resin tube 1, it can be slid and moved by human hands. Demonstrate the effect of preventing slide movement. The joint body 5 in FIG. 1 and the moving sleeve 6 in FIG.

  FIG. 3 shows an example of the diameter expansion tool of the present invention, where (a) is a front view thereof, (b) is a front view of (a), and (c) is a longitudinal sectional view of (a). , (D1), (d2) to (f1), (f2) are a side view and a front view of three types of diameter-expanded portions that can be attached and detached, respectively.

  The basic configuration of the diameter expansion tool 20 is the same as that described in Patent Document 7, and is not described in Patent Document 7, which is a feature of the diameter expansion tool 20 and is described in Patent Document 7. What is different from the above is that there is a certain relationship between the lengths B1 to B3 of the enlarged diameter portion and the outer diameters C1 to C3 of the enlarged diameter portions 14 to 15B.

  When the diameter expansion tool 20 repeats the operation of moving the operation handle 11 close and away, the diameter expansion core body 13 having the conical tip portion irreversibly moves stepwise in the right direction in FIG. As a result, the outer diameter of the expanded diameter portion 14 constituted by 6 divisions is sequentially expanded, and the diameter of the tube end portion 1a of the synthetic resin tube 1 is expanded.

  When the lever 12 is rotated to the state shown by the two-dot chain line in FIG. 5C, the spring with the built-in enlarged core 13 returns to the original position, and the outer diameter of the enlarged diameter portion 14 is also outside the original. It becomes the diameter.

  Here, according to the diameter-expansion tool 20 described in FIGS. 3A to 3C, (d1), and (d2), the diameter-expanded portion of the diameter-expanded portion outer diameter C1 with the diameter-expanded portion length B1. 14, the pipe end 1a of the synthetic resin pipe 1 can be expanded so as to be suitably connected to the pipe joint 10 shown in FIGS.

  In other words, according to the expanded diameter portion 14, the expanded diameter outer diameter C1 is smaller than the inner diameter D0 of the non-expanded synthetic resin tube 1, so that it can be easily inserted into the tube end 1a and expanded. In the state where the outer diameter of the tube end portion 1a corresponds to the guide inner surface 3a of the guide portion 3 of the joint body 5, the tube end portion 2a can be extrapolated without resistance, and the end surface of the tube end portion 1a is the guide inner end 3b. It is possible to easily position the extrapolated state of the tube end 1a by contacting the tube. Details thereof will be described later with reference to FIG.

  The synthetic resin pipe 1, the pipe joint 10 composed of the joint body 5 and the movable sleeve 6, and the diameter expansion tool 20 are collectively referred to as a pipe connection device 50. The enlarged diameter portions 14A and 14B correspond to synthetic resin pipes having different inner and outer diameters, respectively, and each has a four-part configuration.

  4A and 4B show an example of the connection tool of the present invention. FIG. 4A is a top view thereof, FIG. 4B is a front view thereof, and FIG. 4C is a longitudinal sectional view showing an internal mechanism thereof.

  This connecting tool 30 is the same as that described in Patent Document 4, and the synthetic resin pipe 1 whose pipe end portion 1a is expanded by the diameter expanding tool 20 in FIG. After the insertion and positioning, the movable sleeve 6 is pressed and moved with respect to the joint body 5 in a state of being externally inserted into the pipe end portion 1 a, so that the movable sleeve 6 is positioned outside the inner cylindrical portion 2, and The front end is moved so as to come into contact with the end face of the guide portion 3.

  Therefore, the connecting tool 30 includes a main body side bifurcated pressing portion 21A that abuts on the end surface of the intermediate portion 5a of the joint body 5 and a sleeve side bifurcated portion that abuts the end surface of the movable sleeve 6 on the side opposite to the tube end 1a. By providing the pressing portion 21B and operating the operation handle 22, the sleeve-side bifurcated pressing portion 21B can be moved closer to the main body-side bifurcated pressing portion 21A while maintaining both parallel states. ing.

  Further, the connecting tool 30 incorporates a ratchet mechanism and irreversibly achieves the proximity movement described above, but also incorporates a ratchet release mechanism and returns to the original open state after the proximity movement is completed. It is something that can be done.

  Thus, the synthetic resin pipe 1 is expanded with the diameter expansion tool 20, the expanded pipe end 1 a is extrapolated to the joint body 5, and the movable sleeve 6 is moved with the connection tool 30, and the synthetic resin A mode of connecting the pipe 1 to the pipe joint 10 will be described with reference to FIGS.

  5 (a), (b), and (c) are explanatory views sequentially showing the diameter expansion mode of the pipe end portion of the synthetic resin pipe by the diameter expansion tool of the present invention. The parts already described above are denoted by the same reference numerals, and redundant description is omitted.

  First, as shown in FIG. 5 (a), the movable sleeve 6 is extrapolated to the non-expanded synthetic resin tube 1 so that the inclined opening 6c side becomes the tube end 1a, and a diameter expansion tool 20 is prepared. Is done.

  Next, as shown in FIG. 5B, the non-expanded pipe end portion 1 a is extrapolated to the expanded diameter portion 14 in the minimum diameter state of the expanded diameter tool 20 while the movable sleeve 6 is extrapolated.

  Next, as shown in FIG. 5 (c), when the operation of the operation handle 11 of the diameter expansion tool 20 is repeated, the pipe end portion 1a is expanded to have an inner and outer diameter that satisfies the above-described conditions. Here, when the lever 12 is rotated in the direction shown by the two-dot chain line, the irreversible lock is released, the diameter-expanded portion 14 returns to the minimum diameter state, and the pipe end portion 1a is expanded in diameter. The pipe 1 can be removed, and the connection process with the pipe joint 10 of FIG. 6 can be performed.

  6 (a) to 6 (d) are longitudinal sectional views sequentially showing a mode in which a synthetic resin pipe whose pipe end portion is expanded in diameter is connected to a pipe joint.

  First, as shown in FIG. 6 (a), when the diameter of the pipe end 1a is reduced after expansion and the outer diameter of the pipe end 1a becomes a diameter corresponding to the guide inner surface 3a of the guide part 3 of the joint body 5, In a state in which the portion 1a is along the guide inner surface 3a, the tube end portion 1a is extrapolated to the insertion tube portion 2 until the end surface of the tube end portion 1a contacts the guide back end 3b. Thus, the extrapolated positioning of the tube end 1a is achieved.

  At this time, as can be seen in FIG. 6A, there is a gap between the inner periphery of the pipe end portion 1a in the expanded state and the outer periphery of the inner tube portion 2, and the inner tube portion 2 is connected to the tube end. The pipe end portion 1a can be easily positioned and inserted with respect to the joint body 5 without causing resistance for insertion of the portion 1a. During this time, the contact between the guide inner surface 3a of the guide portion 3 and the outer periphery of the tube end portion 1a maintains the coincidence between the center of the tube end portion 1a and the center of the insertion tube portion 2.

  In the state shown in FIG. 6A, the moving sleeve 6 is moved to the joint body 5 with the connecting tool 30 as shown in FIGS. 6C and 6D without waiting for further natural diameter reduction. The contact can be completed to complete the connection. In this case, the work efficiency is improved.

  Then, as time passes, as shown in FIG. 6B, the tip of the tube end 1a is reduced in diameter from the back side of the tube end 1a while contacting the guide inner surface 3a of the guide 3. Then, the inner surface of the tube end portion 1 a comes into contact with the insertion convex portion 2 a at the tip of the insertion tube portion 2. As a result, the concentricity of the joint body 5 and the pipe end 1a is ensured at two locations in the axial direction, and the synthetic resin pipe 1 is connected to the joint body 5 in a better concentric state. .

  Next, as shown in FIG. 6C, the joint body 5 and the movable sleeve 6 are sandwiched between the main body side bifurcated pressing portion 21 </ b> A and the sleeve side bifurcated pressing portion 21 </ b> B of the connection tool 30, and the connection tool 30 is operated. When the sleeve-side bifurcated pressing portion 21B moves to approach the main body-side bifurcated pressing portion 21A, the connection between the two is completed as shown in FIG.

  Thus, according to this pipe connecting device 50, the pipe end portion 1a of the synthetic resin pipe 1 whose diameter has been expanded can be extrapolated to the insertion tube section 2 of the pipe joint 10 without resistance, and the diameter is expanded in that state. The synthetic resin pipe can be connected in a state where both the centers of the pipe end portion 1a and the insertion tube portion 2 coincide with each other, and the working efficiency can be improved.

  6A and 6B, the pipe end 1 a of the synthetic resin pipe 1 whose diameter has been expanded has a diameter corresponding to the guide inner surface 3 a of the guide part 3. Although the outer diameter of the portion 1a is slightly larger than the guide inner surface 3a, the outer diameter of the tube end portion 1a is smaller than the guide inner surface 3a, but larger than the inner diameter D4 of the guide inner end 3b, from a state where it can be press-fitted by human hands. Up to (the extrapolation reference determination of the pipe end 1a is maintained).

  During a certain period of time during which the natural diameter reduction proceeds, the inner diameter of the tube end portion 1a can be maintained larger than the outer diameter D3 of the inner tube portion 2, and the tube end portion 1a can be maintained at the inner tube portion 2. Therefore, the pipe end 1a can be extrapolated to the joint body 5 without panicking, and workability is improved.

  Further, as shown in FIG. 6 (b), the outer periphery on the distal end side of the tube end portion 1a in a state where the inner side of the inner diameter of the tube end portion 1a is in contact with the most advanced insertion convex portion 2a of the insertion tube portion 2. However, the outer end positioning of the pipe end 1a is already in contact with the end face of the pipe end 1a to the guide inner end 3b. Since the concentricity of the pipe end portion 1a and the inner tube portion 2 which are achieved and expanded in diameter is maintained by contact between the inner and outer surfaces of both, there is no problem.

  Therefore, according to the pipe connecting device 50 of the present invention, after the diameter of the pipe end portion 1a is increased, the extrapolated positioning of the pipe end portion 1a can be performed more relaxedly and without resistance, and workability is also improved. .

  In other words, according to the pipe connecting device 50 described above, the pipe joint 10 is formed by inserting the tube end portion 1a immediately after the diameter expansion, which is loosely inserted into the outside of the insertion tube portion 2 without resistance, by the natural diameter reduction. In order to enable clamping by movement of the movable sleeve 6 in a state where the center of the pipe end portion 1a in the expanded state and the center of the insertion tube portion 2 coincide with each other until close to 2 It is provided on the periphery of the outer periphery of the distal end side of the tube end portion 1a in the expanded state inserted loosely outside the portion 2, and includes a guide portion 3 for positioning the extrapolated state of the tube end portion 1a. It can also be said that the above-described effects are exhibited.

  Furthermore, in addition, the pipe connecting device 50 of the present invention is configured so that the distal end side of the pipe end portion 1a that is reduced in diameter later than after the diameter enlargement is externally positioned by the guide portion 3 without resistance of the insertion tube portion 2. The connection of the synthetic resin pipe 1 to the pipe joint 10 by the movement of the movable sleeve 6 can be achieved while maintaining the concentricity at the back side of the pipe end 1a which is reduced in diameter earlier than the diameter expansion. It is possible to skillfully utilize the aspect of natural diameter reduction after diameter expansion of the synthetic resin pipe 1.

Embodiment 2

  FIG. 7 shows another example of the joint body of the pipe joint of the present invention, where (a) is a plan view thereof, (b) is a front view thereof, and (c) is a partial front view of a half cross section thereof. (D) is the external appearance perspective view.

  Compared to the joint body 5 of FIG. 1, the joint body 5A is provided with an insertion tube part 2A and a guide part 3A in the opposite direction around the same axis centered on the intermediate part 5g, and the synthetic resin pipes 1 are connected to each other. The difference is that it is used to connect. The moving sleeve 6 is the same as that shown in FIG.

  In addition, the guide portion 3A is provided at two opposing locations that divide the circumference into two equal parts, the guide inner surface 3d is constituted by a plane, and the guide inner end 3e is also constituted by a rib shape and an arc shape. Is different. The positioning confirmation recessed window 3f corresponds to the positioning confirmation recessed window 3c of the guide portion 3 of the joint body 5 of FIG.

  However, according to the pipe connecting device provided with the joint body 5A, it is understood that the configuration and the main part of the pipe connecting device 10 are the same, and the same effect as the pipe connecting device 10 is exhibited.

  Note that there are only two places where the guide inner surface 3d faces each other, and concentricity in the direction orthogonal to the guide inner surface 3d is not guaranteed, but extrapolation positioning of the tube end 1a by the guide inner end 3e is achieved, Since the concentricity between the inner periphery of the tube end 1a and the outer periphery of the insertion tube portion 2A is ensured, there is no problem in that respect.

  FIG. 8 shows another example of the diameter expanding tool of the present invention, where (a) is a side view thereof and (b) is a front view thereof.

  The basic configuration of the diameter expansion tool 20A is the same as that described in Patent Document 5, and is not described in Patent Document 5, which is a feature of the diameter expansion tool 20A and is described in Patent Document 5. What is different from the above is that there is a certain relationship between the lengths B4 and B5 of the expanded portion and the outer diameters C4 and C5 of the expanded portions 14C and D.

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

  In addition, according to this diameter expansion tool 20A, since the diameter expansion parts 14C and D are divided into two parts, the diameter can be expanded only in one opposite direction of the synthetic resin pipe. If the end and the enlarged diameter portions 14C and 14D are relatively rotated, the diameter of the synthetic resin pipe can be increased over the entire circumference.

  Further, when connecting to the joint body 5A having only two guide portions 3A facing each other as described with reference to FIG. 7, the diameter is expanded so as to correspond to the guide inner surface 3d only in that direction, The diameter can be increased to the extent that it exceeds the outer diameter of the inner cylindrical portion 2A, and in that case, the labor for expanding the diameter can be saved.

  Note that the pipe connection device of the present invention is not limited to the above-described embodiment, and various modifications and combinations are possible within the scope of the claims and the scope of the embodiments, and these modifications Combinations are also included in the scope of rights.

  For example, although the number of guide portions is 2 and 4 here, it may be 3 or 5 or more.

  The pipe connecting device of the present invention is capable of extrapolating the pipe end part of the expanded synthetic resin pipe to the insertion tube part of the pipe joint without resistance, and inserting the pipe end part expanded in that state with the pipe end part. Synthetic resin pipes can be connected in the state where both centers coincide with the cylindrical part, and can be used in the industrial field related to pipe connection where improvement in work efficiency is required.

DESCRIPTION OF SYMBOLS 1 Synthetic resin pipe 2, 2A Inner tube part 3 Guide part 4 Extra wall accommodating part 5, 5A Joint main body 6 Moving sleeve 10 Pipe joint 20, 20A Diameter expansion tool 30 Connection tool 50 Pipe connection apparatus

Claims (5)

After the inner and outer diameters of the tube end are forcibly expanded by external force, the tube end is naturally reduced in diameter, and the inner and outer diameters of the tube end of the synthetic resin tube are forcibly reduced. A diameter expanding tool that expands to
A pipe connection device comprising a pipe joint to which a pipe end portion of the expanded synthetic resin pipe is connected,
The pipe joint has an outer diameter larger than an inner diameter of a non-expanded pipe of the synthetic resin pipe, and an insertion cylinder portion into which a pipe end portion expanded by the diameter expansion tool is extrapolated, and the insertion In order to sandwich the tube end portion extrapolated to the cylindrical portion with the inner cylindrical portion, it is arranged outside the inner cylindrical portion from the position extrapolated to the synthetic resin pipe in the non-diameter expanded portion. A moving sleeve that slides along the synthetic resin tube to a position;
The diameter expansion tool is configured to expand the inner diameter of the entire region in the axial direction of the pipe end portion so as to be larger than the outer diameter of the insertion tube portion,
The synthetic resin pipe, a certain time immediately after expanded by the diameter expansion tool is configured to naturally necked to be extrapolated without resistance before Symbol in挿筒portion the tube end portion,
The pipe joint has a diameter-expanded tube until the pipe end immediately after diameter expansion, which is loosely inserted without resistance in the outer side of the insertion tube portion, comes into close contact with the insertion tube portion due to natural diameter reduction. order to enable the holding by the movement of the moving sleeve in a state that is matched with the center of the inner挿筒of the end, the pipe end of the loosely inserted has been expanded state outside of the inner挿筒portion part disposed on the periphery of the distal end side outer circumference, the pipe connection apparatus further comprising a guide portion you positioning extrapolation state of the tube end.   The pipe connection device according to claim 1, wherein an inner circumference of the reduced diameter pipe end portion is in contact with an outer circumference of the insertion tube portion in a state where the pipe end portion is positioned by the guide portion. The guide portion includes a guide inner surface disposed along an outer periphery of a diameter-expanded tube end portion that is loosely inserted outside the inner tube portion, and a guide inner end that contacts the end surface of the tube end portion. Prepared,
By inserting the outer diameter of the pipe end in the expanded state along the inner surface of the guide and bringing the end face of the end into contact with the back end of the guide, the center of the expanded pipe end and the center The pipe connection device according to claim 1 or 2, wherein an extrapolation state of the pipe end portion is positioned so as to coincide with a center of the insertion tube portion. A pipe joint to which a synthetic resin pipe in which the pipe end naturally shrinks after a lapse of a certain time when the inner and outer diameters of the pipe end are forcibly expanded by an external force,
An insertion tube portion having an outer diameter that is larger than the inner diameter of the non-expanded tube end portion of the synthetic resin tube and smaller than the inner diameter of the expanded tube end portion, and on which the expanded tube end portion is extrapolated When,
In order to hold the tube end portion extrapolated to the inner tube portion between the inner tube portion and the inner tube portion, the outer end portion of the non-diameter portion is inserted from the synthetic resin tube to the outside of the inner tube portion. A moving sleeve that slides along the synthetic resin tube to a position where it is disposed;
Until the tube end immediately after expansion, which is loosely inserted into the outside of the insertion tube portion without resistance, comes into close contact with the insertion tube portion due to natural contraction, the center of the expanded tube end portion In order to enable clamping by the movement of the movable sleeve in a state where the center of the insertion tube portion is coincident, the outer periphery of the distal end side of the tube end portion in a diameter-expanded state that is loosely inserted outside the insertion tube portion. A pipe joint, comprising: a guide part disposed at a peripheral edge and positioning an extrapolated state of the pipe end part. The guide portion includes a guide inner surface disposed along an outer periphery of a pipe end portion in a diameter-expanded state loosely inserted on the outer side of the insertion tube portion, and a guide inner end that comes into contact with the end surface of the tube end portion. ,
By inserting the outer diameter of the pipe end in the expanded state along the inner surface of the guide and bringing the end face of the end into contact with the back end of the guide, the center of the expanded pipe end and the center The pipe joint according to claim 4, wherein an extrapolated state of the pipe end portion is positioned so as to coincide with a center of the inner tube portion.

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