JP2001324071A - Connecting tool for pipe body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting tool for a pipe capable of connecting with high airtightness and connecting strength sufficient to withstand fluid pressure only in a single operation of insertion of a tip of a pipe body to be connected without previous processing of the tip of the pipe body, allowing to easily confirm complete connection, with excellent working efficiency of connection at a low manufacturing cost. SOLUTION: This connecting tool inserts and connects the pipe body to be connected. The connecting tool is formed with a cylindrical groove consisting of a hollow inner pipe part extended along an inner circumferential wall so as to sandwich the whole inner circumferential wall and outer circumferential wall of the pipe body between the inside and the outside and an outer pipe part extended along the outer circumferential wall. The inner pipe part comprises an O ring closely contacted to the pipe body, and an annular blade eating into the pipe body is provided to the outer pipe body corresponding to the O ring. The annular blade is tilted toward an inserting direction of the pipe body. Only when the pipe body is completely inserted, the tip of the pipe body pushes up an insertion end of an insertion confirming member, and the insertion confirming member is projected at an appropriate position in an outer circumference of a connecting tool main body near a bottom of the cylindrical groove consisting of both pipe parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connector for connecting a pipe (particularly, a resin pipe made of cross-linked polyethylene or polybutene) in a fluid pipe to a fluid flow pipe or a fluid device. It belongs to

[0002]

2. Description of the Related Art Conventionally, water heaters and solar systems,
Alternatively, a bellows-shaped flexible tube made of stainless steel is frequently used for piping around water such as for hand washing, and the connection portion has a joint connection structure as shown in FIG. An O-ring b is attached to the groove at the end of the flexible tube a, and a resin ring-shaped sleeve c that engages with the outer surface of the flexible tube a is attached to the outer periphery of the flexible tube a. At the step e of
By attaching the O-ring f and screwing the cap nut g to the nipple d, the flexible tube a is pushed in the direction of arrow M and connected to the nipple d. FIG. 1 shows a state in which the cap nut g is not sufficiently tightened, but in a state in which the cap nut g is sufficiently tightened, the sleeve c is pushed by the step h of the cap nut g so as to be in the opening i of the nipple d. Slightly press fit flexible tube
a is fixed to the nipple d, and in this state, the O-ring
b is press-fitted into the nipple d, the tip of the flexible tube a is pressed against the O-ring f, and the flexible tube a is
And the nipple d is kept airtight. However, in such a connection structure, it is necessary to attach the O-ring b or the sleeve c to the distal end of the flexible tube a passed through the cap nut g beforehand, and then screw the cap nut g to the nipple d. Because pipe connection cannot be done with one-touch work,
There is a problem that the connection work of the piping becomes complicated.

[0003] For this reason, as a utility model registration No. 3058896, one-touch operation is sufficient for fluid pressure without processing a tip end of a pipe in advance and using a part requiring a screw tightening operation such as a cap nut. A connector for connecting a tube to another fluid passage with a high airtightness and a connection strength that can withstand has been proposed. As shown in FIG. 2, the connection tool of the above-mentioned utility model registration No. 3058896 connects a pipe to another fluid passage with a nipple A and a collet C which fits into the nipple A while holding the pipe B. The tube B is gripped by the tube holding projection F of the collet C, and the tongue D and the nipple A of the collet C are held.
Is pressed by an O-ring H from outside to fit the annular groove G.

[0004]

SUMMARY OF THE INVENTION However, the above-mentioned prior art utility model registration No. 3058896 has a connector as described below.
There is no member to support the inside of the tube B with a cavity just by pressing the O-ring H from the outer periphery of the tube. Therefore, when the tube B is distorted, the sealing is not perfect, especially when the tube B is softened by heat. Has a problem that this tendency becomes remarkable, and the outer periphery of the tube B is easily damaged. In this case, there is a similar problem. Furthermore, although the collet C is mounted on the tube B, there is a problem that the tube B may slip out of the collet C because only the tube holding projection F is formed. In addition, there is a problem in that it is uncertain whether the tongue piece D is fitted into the annular groove G or not, since it is confirmed whether or not the pipe B has been completely fitted into the connection tool.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to simply insert the distal end of the tube without performing any processing in advance on the distal end of the tube to be connected. With just one touch operation, you can connect with high airtightness and connection strength enough to withstand fluid pressure,
Further, it is an object of the present invention to provide a pipe connector which can be easily confirmed to be completely connected and has a high connection work efficiency and a low production cost.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 is a connecting tool for inserting and connecting a pipe to be connected, wherein the connecting tool includes an inner peripheral wall of the pipe. Form a cylindrical groove consisting of a hollow inner pipe part extending along the inner peripheral wall so as to sandwich the entire circumference of the outer peripheral wall from the inside and the outside, and an outer pipe part extending along the outer peripheral wall. Is provided with an O-ring that comes into close contact with the tube, an outer tube portion corresponding to the O-ring is provided with an annular blade that cuts into the tube, and the annular blade is provided with a tube that is inclined in the insertion direction of the tube. It is a connection tool. In order to solve the above-mentioned problem, the invention according to claim 2 is a connecting tool for inserting and connecting a pipe to be connected, wherein the inner circumference and the outer circumference of the pipe are entirely inside and outside. Forming a cylindrical groove formed by a hollow inner pipe portion extending along the inner peripheral wall so as to be sandwiched from the outer pipe portion extending along the outer peripheral wall, and a bottom portion of the cylindrical groove formed by the two pipe portions. Only when the tube is completely inserted in the vicinity, the tube end is pushed up by the insertion end of the insertion confirmation member so that the insertion confirmation member protrudes to the appropriate position on the outer periphery of the connector body. Tool.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described with reference to the drawings. The pipe connector of this embodiment is, as shown in FIGS. The main body 2 mainly includes a main body 3 and a cap nut section 4. One end of the main body section 3 is fitted with the cap nut section 4 by means of screws 31, 41 and the like. And the screw portion 32 at the other end is connected to another fluid flow pipe or a fluid passage of a fluid device (not shown).

First, a description will be given of a mechanism for connecting the resin tube 1 made of cross-linked polyethylene or the like firmly to the connector 2 with one touch in the connector of the present embodiment. The pipe 1 to be used is a resin pipe used for water supply / hot water supply pipes of a standard called "13A" having an outer diameter of 17 mm and an inner diameter of 12.8 mm of a crosslinked polyethylene pipe. On the side of the main body 3 of the connector connected to the tubular body 1, an inner diameter extending along the inner circumferential wall 11 of the tubular body 1 with an outer circumferential diameter corresponding to the determined inner circumferential wall 11 of the resin tubular body 1 is provided. A pipe portion 33 is provided, and annular concave portions are provided at two appropriate places of the inner pipe portion 33.
331, 332 are provided, and rubber O-rings 51, 52 that come into close contact with the tube 1 are fitted into the annular concave portions 331, 332, respectively. The opening 333 at the tip of the inner tube portion 33 is provided with an inclination angle so that the outer diameter is reduced so that the tube 1 can be easily inserted. The inner diameter of the opening 333 is also a straight line in FIG. 4A, but when vibration occurs due to a fluid (whistling phenomenon), the inner diameter of the opening 333 is smaller than the opening 333.
The vibration may be prevented by providing an inclination angle so as to increase toward. At the approximate center of the main body 3, a hexagonal rotary tightening portion 34 for connecting and fixing to another fluid flow pipe or fluid device is provided, and subsequently, a screw portion 31 to which the cap nut portion 4 is fitted is provided. However, a cylindrical groove 35 is provided between the inner tube portion 33 and the rotation tightening portion 34, the screw portion 31, and the inner wall 41 of the cap nut portion 4 described later. Has formed. The inner diameter of the outer tube portion 36, that is, the outer shape of the cylindrical groove 35 substantially coincides with the outer diameter 12 of the tube 1, and the cylindrical groove 35
Is formed from the outer wall of the inner tube portion 33 and the inner wall of the outer tube portion 36, and is configured such that when the tube 1 is inserted, the entire periphery of the inserted tube 1 is sandwiched from inside and outside.

The cap nut portion 4 is formed by an inner screw portion 42 and the like.
The cap nut portion 4 is internally connected to the screw portion 42 and is fixed to the screw portion 31 of the main body portion 3.
Is provided, and a screw portion of the cap nut portion 4 is provided.
The opening 44 on the insertion side of the tube 1 opposite to 41 is inclined so that the tube 1 can be easily inserted, and the space between the fixing portion 43 and the opening 44 is the tube 1. An inner wall 41 that forms a part of the outer tube portion 36 is provided so as to be in contact with the outer peripheral wall 12. The position where the annular blade 6 is located is provided in the middle of two O-rings 51 and 52 slightly protruding from the outer periphery of the inner pipe portion 33 as shown in FIG. Then, the inserted tube 1 is arranged to be pressed by the inner O-rings 51 and 52 and the outer annular blade 6.

The shape of the annular blade 6 is such that the inner peripheral portion 62 is uneven, and the tip of the convex portion 63 forms a blade 631 to easily bite into the tubular body 1. Is made of a metal having some elasticity, and is slightly inclined in the insertion direction of the tube 1. As another example of the annular blade 6, the number of the annular blades 6 in the present embodiment is one. However, as another example, two or more annular blades 6 may be provided, and a fixed portion may be disposed apart from This makes the insertion of the tube 1 smoother and more secure. Another embodiment of the annular blade 6 will be described with reference to FIGS. 6 and 7. The convex portion of the annular blade 6 is composed of two types of short trapezoidal short blades 632 and a long platform. The long blades 633 of the blade having the shape are defined by the groove portions 66 and are alternately arranged on the inner peripheral portion 62, and the inclination angle with respect to the vertical with respect to the tube 1 is larger than that of the short blades 632. Then, as shown in FIG. 7B, the contact positions of the two types of blades with the tube 1 are shifted so as to bite into the tube 1 at two peripheral surface positions of the tube 1. Escape recesses are formed at the cutting edges of the short blade 632 and the long blade 633. Therefore, in this embodiment, although one annular blade is used, it has the same action as two annular blades provided separately, and it is impossible to form an annular recess by forming a recess. Since it has the effect of shifting the force in the right and left direction even if a strong force is applied,
Can be smoothly and easily inserted, and the fixing of the tubular body 1 to the connecting tool can be further ensured. Further, even if the tube 1 is pulled out, the tube is not damaged. By providing the various annular blades 6 described above, insertion of the tube 1 is easy, but once inserted, the tube 1 has a structure that cannot be easily removed.

As shown in FIG. 4, a fixing member 7 is provided for fixing the annular blade 6, and the fixing member 7 is a blade fixing portion 71 for pressing a side surface of the annular blade 6 near the outer diameter 64. The portion in contact with the tubular body 1 has a tip 63
An annular space 72 is provided so that 1 can move back and forth, and the gap between the blade fixing portion 71 of the fixing member 7 and the fixing portion 43 of the cap nut portion 4 is made slightly larger than the thickness of the outer diameter 64 of the annular blade 6. Then, the annular blade 6 is fixed with some backlash, and the tubular body 1 and the annular blade 6 are fixed.
Are rotatable with respect to the connector 2, and after the tube 1 is connected to the connector 2, the tube 1 is rotated to correct the twist of the tube 1. In this case,
Even if it is rotatable, the O-rings 51 and 52 are in contact and airtightness is maintained. In this embodiment, the tube 1 and the annular blade 6
Is rotatable with respect to the connector 2, but when it is necessary to connect more firmly, the side surface near the outer diameter 64 is formed to fit closely to the inner wall of the cap nut portion 4. When assembled, the side surface of the annular blade 6 near the outer diameter 64 may be pressed and fixed.

Therefore, when the resin tube 1 made of cross-linked polyethylene or the like is inserted into the cylindrical groove 35 formed by the inner tube 33 and the outer tube 36 through the openings 333 and 44, The tubular body 1 slides in close contact with the O-rings 51 and 52, and is smoothly inserted to the bottom of the groove 35 while pushing the annular blade 6 in the inclined direction. Inserted resin tube 1 made of polyethylene
Is moved in the pulling-out direction, the blade 631 of the protruding portion 63 of the annular blade 6 is made of a resinous tube 1 made of polyethylene.
The O-ring 5 provided on the inner wall 11 side of the tubular body 1 digs into the outer peripheral wall of the tube 1 and is pressed inward by the annular blade 6.
The tube 1 is tightly fixed to the connecting member 2 tightly. Although the main body 3 and the cap nut 4 are joined together by the screw portions 31 and 42, they are fixed. However, an adhesive may be applied or welded so that the joining is not released. . Alternatively, it may be directly fixed by brazing or the like without providing a screw portion or the like.

Next, an insertion confirming mechanism for confirming that the tube 1 has been completely inserted into the connecting tool 2 will be described. In the bottom part 37 of the cylindrical groove 35 formed by the inner pipe part 33 and the outer pipe part 36 in the main body part 3 of the connector, an insertion confirmation member 8 of the tubular body 1 is provided. Mushroom-shaped member 81
Is fitted into the through hole 38 communicating with the outer periphery of the inner tube portion 33 at the center of one plane of the hexagonal rotation tightening portion 34, and the head 811 which is the insertion end of the mushroom-like member 81 is always in the inner tube portion. The outer periphery of 33 is pressed by a spring 82. The head 811 is configured to slide up and down in the large-diameter cylindrical portion 381 inside the through hole 38 by the spring 82. When the tube 1 is not inserted into the connector 2 of this embodiment, the mushroom-like member 81 of the insertion confirming member 8 is pushed downward by the spring 82 as shown in FIG. Although the upper end portion 83 of the mushroom-shaped member 81 does not protrude from the through hole 38 in the center of one plane of the hexagonal rotation tightening portion 34 while being pressed, the pipe 1 is When it is inserted to the bottom 37 of the completely cylindrical groove 35, as shown in FIG.
Is pushed up, and the tip 83 of the mushroom-like member 81 projects from the through hole 38 at the center of one plane of the hexagonal rotary tightening portion 34. Therefore, the pipe 1 is completely connected
Is connected to the mushroom-shaped member which is the insertion confirmation member 8
The tip 83 of 81 protrudes from the plane of the rotation tightening part 34, so you can visually check the projected state, and in narrow or dark places, touch the protrusion of the tip 83 with your finger to check can do. The pipe connecting device of the present embodiment can connect the pipe firmly with a simple configuration using an annular blade, and the connection can be easily confirmed. Therefore, the working efficiency is improved and the structure is relatively simple. Therefore, the manufacturing cost is low.

It is needless to say that the present invention is not limited to the above two embodiments unless the characteristics of the present invention are impaired. For example, the material of the tube is not limited to cross-linked polyethylene or polybutene. Other resin tubes may be used,
Also, as long as the annular blade bites into the same material as the resin pipe, it may be used for a hard rubber pipe, a copper pipe, a stainless steel pipe, a steel pipe, or the like. Although the tube is also a 13A standard tube, the inner tube portion, the outer tube portion, and other shapes may be appropriately changed in accordance with a resin tube of another standard.

[0015]

As described above, according to the first aspect of the present invention, there is provided a connector for inserting and connecting a pipe to be connected, wherein the entire circumference of an inner peripheral wall and an outer peripheral wall of the pipe is connected. A hollow inner pipe portion extending along the inner peripheral wall so as to sandwich the
A cylindrical groove formed by an outer tube extending along the outer peripheral wall; an inner tube provided with an O-ring in close contact with the tube; an outer tube corresponding to the O-ring is provided with a tube; An annular blade that cuts into the pipe is provided, and the annular blade is a connector for the pipe that is inclined in the insertion direction of the pipe, so that the pipe is inserted into a cylindrical groove formed by the inner pipe and the outer pipe. When this is done, it slides in close contact with the O-ring, and has the effect that the annular blade can be inserted smoothly and one-touch along the inclined direction. Also, if you try to move the inserted tube in the reverse direction,
The effect that the annular blade bites into the tubular body and is pressed inward by the annular blade is prevented by the O-ring provided inside the tubular body, thereby firmly fixing the tubular body in close contact with the connector. Is obtained. According to the second aspect of the present invention, only when the pipe is completely inserted in the vicinity of the bottom of the cylindrical groove formed by the two pipes, the distal end of the pipe is inserted into the insertion confirmation member. This is a pipe fitting that pushes up the insertion end so that the insertion confirmation member protrudes into the appropriate place on the outer periphery of the connection fitting main body. Since the protruding portion is protruded, the protruding state may be visually confirmed. In a narrow place or a dark place, it is possible to confirm that the insertion confirmation member is protruding with a finger to confirm.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a conventional pipe fitting.

FIG. 2 is a cross-sectional view of another conventional pipe fitting.

FIG. 3 is an exploded perspective view of a preferred embodiment to which the present invention is applied.

FIG. 4 (a) is a cross-sectional view in which a pipe is inserted into the connector of the embodiment in which the components of FIG. 3 are assembled, and FIG. 4 (b) is FIG. 4 (a)
Vertical sectional view taken along the line bb in FIG.

FIG. 5 is a cross-sectional view of the connection device in FIG. 4 in a state where a pipe is not mounted;

FIG. 6 is a perspective view of another preferred embodiment of the annular blade to which the present invention is applied.

7 (a) is a plan view of the annular blade of FIG. 6, and FIG. 7 (b) is a partial side sectional view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Resin tube 11 ... Inner peripheral wall 12 ... Outer peripheral wall 13 ... Tip part 2 ... Connection part 3 ... Body part 31, 32 ... Screw part 33 ... Hollow inner tube part 331,332 ... Annular concave part 333 ... Opening part 34 ... Rotation Tightening part 35… Cylindrical groove 36… Outer tube part 37… Bottom part 38… Through hole 381… Large diameter cylinder part 4… Bag nut part 41… Inner side wall 42… Screw part 43… Fixed part 44… Opening part 51, 52 ... O-ring 6 ... Circular blade 61 ... Outer periphery 62 ... Inner periphery 63 ... Protrusion 631 ... Blade 632 ... Short blade 633 ... Long blade 64 ... Outer diameter 65 ... Escape recess 66 ... Groove 7 ... Fixing member 71 ... Blade fixing part 72 ... Annular space part 8 ... Insert confirmation member 81 ... Mushroom-like member 811 ... Head part 82 ... Spring 83 ... Tip part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H014 GA09 3H015 JA02 3J106 AB01 BA01 BB01 BC04 BD01 BE12 BE25 BE29 BE33 CA03 EA03 EB02 EC01 EC07 ED13 EE02 EF04 EF05

Claims (2)

[Claims] 1. A connecting tool for inserting and connecting a pipe to be connected, wherein a hollow member extending along an inner peripheral wall so as to sandwich the entire circumference of an inner peripheral wall and an outer peripheral wall of the tubular body from inside and outside. Forming a cylindrical groove composed of a pipe portion and an outer pipe portion extending along the outer peripheral wall, and providing an O-ring in close contact with the pipe body in the inner pipe portion,
An outer tube portion corresponding to the O-ring is provided with an annular blade that bites into the tube, and the annular blade is inclined in a direction in which the tube is inserted. 2. A connecting tool for inserting and connecting a pipe to be connected, wherein a hollow member extending along the inner peripheral wall so as to sandwich the entire circumference of the inner peripheral wall and the outer peripheral wall from the inside and the outside. A cylindrical groove formed of a pipe portion and an outer pipe portion extending along the outer peripheral wall is formed, and only when the pipe body is completely inserted near the bottom of the cylindrical groove formed by both the pipe portions. A connection tool for a tubular body, characterized in that the tip of the tubular body pushes up the insertion end of the insertion confirming member so that the insertion confirming member protrudes into an appropriate position on the outer periphery of the connector body.