JP2007255684A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint capable of simply and quickly connecting a resin short pipe to a joint main body with sealing and preventing coming off without using a nut (press ring) like former joints. <P>SOLUTION: This joint is provided with the resin short pipe 2 inserted in a socket part 6 of the joint main body 1, an outer ring 3 installed on an outer circumference of the resin short pipe 2 and including a coming off prevention ring storage groove 11 on an outer circumference, a coming off prevention ring 4 loosely fitted in the coming off prevention ring storage groove 11 and having outer diameter larger than outer diameter of the resin short tube 2 under a free condition and being able to expand and contract diameter, and a seal ring 5 interposed between an outer circumference of an insertion side tip part of the resin short pipe 2 and an inner circumference of the socket part 6. An annular coming off prevention groove 7 corresponding to an outer circumference of the coming off prevention ring storage groove 11 when the resin short pipe 2 is inserted in the socket part 6 to predetermined depth is provided on an inner circumference of the socket part 6 of the joint main body 1. When the resin short pipe 2 is inserted in the socket 6 to the predetermined depth with contracting the diameter of the coming off prevention ring 4, the coming off prevention ring 4 expands and restores and an outer diameter part of the coming off prevention ring 4 engages with the coming off prevention groove 7 under a coming off preventing condition. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe joint used for piping such as water / hot water supply, cold / hot water, and cooling water, and connecting one end of the piping to an instrument such as a water tap.

  As a pipe joint used for piping such as water supply and hot water supply, for example, a pipe joint as shown in FIG. 5 has been proposed (for example, see Patent Document 1). This pipe joint includes a joint body 21 that can be connected to an instrument such as a water tap and has an opening 20 at one end, and a resin short pipe that is inserted into the opening 20 of the joint body 21 (in Patent Document 1). (Referred to as a “socket”) 22, a nut (push wheel) 24 screwed into a male screw 23 provided on the outer periphery of the receiving portion 20 of the joint body 21, an inner periphery of the opening end of the receiving portion 20, and resin A washer 25, an O-ring 26, and an annular leaf 27 are provided between the short pipe 22 and the outer periphery.

  When constructing the pipe joint in the field, first, the joint body 21 is connected to an apparatus such as a water faucet, and a washer 25, an O-ring 26, an annular leaf 27, and a nut 24 are inserted into the resin short pipe 22 in this order. In addition, after the water supply pipe P is inserted into the resin short pipe 22 and bonded and joined, the resin short pipe 22 is inserted into the receiving portion 20 of the joint body 21 at the insertion side end. The nut 24 is inserted until it comes into contact with the stopper rib 28, and the nut 24 is fastened to the joint body 21.

JP 2003-227589 A

  However, the above-described pipe joint has a problem in tightening management in that it is difficult to confirm the shortage of tightening of the nut 24 after completion of construction on site. For this reason, when the tightening of the nut 24 is loosened due to vibration, an external load, or the like, water in the water supply pipe P may leak. In addition, due to the structure in which the nut 24 is fastened to the joint body 21, polygonal tool hanging portions 21 a and 24 a such as hexagons and octagons are formed on the outer periphery of the joint body 21 and the outer periphery of the nut 24 even when the nominal diameter is small. Therefore, the joint main body 21 and the nut 24 are increased by that amount, leading to an increase in material cost and an increase in the size of the joint as a whole, resulting in a heavy weight.

  The present invention has been made to solve such problems, and the object of the present invention is to reduce the cost and size by omitting the use of a nut (push wheel) like the conventional pipe joint described above. The assembly workability can be improved by eliminating the tightening work of the nut, and the problem of loosening of the nut after installation can be solved, and the occurrence of water leakage accidents can be surely prevented and reliability is improved. It is to provide a pipe joint with high height.

The pipe joint according to the present invention includes a joint body having a receiving portion at least at one end, a resin short pipe inserted into the receiving portion of the joint body, and the resin short pipe as described in claim 1. An outer ring that is mounted on the outer periphery of the tube and has an annular retaining ring receiving groove on the outer periphery, and an outer ring that is loosely fitted in the retaining ring receiving groove and is larger than the outer diameter of the resin short tube in a free state. A retaining ring having a diameter portion and capable of being expanded and contracted, and a seal ring interposed between the overlapping surfaces of the insertion-side tip portion of the resin short tube inserted into the receiving portion and the receiving portion. An annular retaining groove on the inner periphery of the receiving portion of the joint body, and the outer ring is inserted into the resin short tube and inserted into the receiving portion. It is provided so as to correspond to the outer periphery of the retaining ring receiving groove of the outer ring. When the resin short tube is inserted to a predetermined depth in the receiving portion while reducing the diameter of the retaining ring, the retaining ring expands and the outer diameter portion of the retaining ring is restored. It is characterized by being configured to engage with the retaining groove in a retaining shape.
According to such a configuration, the outer diameter portion of the retaining ring can be retained in the retaining groove by simply inserting the resin short pipe into the receiving portion of the joint body with the outer ring and retaining ring attached. Because of the engagement, the resin short pipe can be easily and quickly connected to the joint body in a retaining shape and in a sealing shape.

  The pipe joint according to claim 1 can join one end of the resin pipe to the resin short pipe as described in claim 2. According to a third aspect of the present invention, the resin short tube can be inserted into the receiving portion so as to be relatively rotatable. According to this, even after the resin pipe is joined to the resin short pipe, the joint main body can be screwed into an instrument such as a water tap and a valve, and the joint main body can be easily attached to the instrument.

  Further, in the pipe joint according to any one of claims 1 to 3, as described in claim 4, the outer ring is constituted by a pair of semicircular split rings, or as in claim 5, The outer ring can be integrally formed on the outer periphery of the resin short tube.

  The pipe joint according to any one of claims 1, 2, 4, and 5, as described in claim 6, has a cylindrical shape that protrudes toward the distal end at the insertion-side tip of the resin short pipe. While forming the projecting portion, a cylindrical groove portion that forms a seal portion by generating a radial surface pressure in accordance with the press-fitting of the cylindrical projecting portion can be formed inside the receiving portion. In this case, only the outer peripheral surface or only the inner peripheral surface of the cylindrical protruding portion 10 can be brought into close contact with the cylindrical groove portion 9 to constitute the seal portion. According to such a configuration, it is possible to further enhance the sealing effect for preventing leakage of water flowing in the joint body.

  According to the present invention, it is possible to connect the resin short pipe to the joint main body in a retaining shape and in a seal shape by simply inserting the resin short pipe into the receiving portion of the joint main body. Nuts (roller wheels) with polygonal tool hooks such as the above can be omitted, thus reducing costs, downsizing, and compactness, and eliminating the tightening work of nuts. The simple work required to be inserted into the receiving part of the main body is sufficient, so that the assembly workability is excellent, and the problems of loose nuts and insufficient tightening after construction can be solved, and the occurrence of water leakage accidents can be surely prevented.

  A preferred embodiment of the present invention will be described with reference to the drawings. 1 is a cross-sectional view of a pipe joint according to an embodiment of the present invention, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 3 is a cross-sectional view showing an assembly process of the pipe joint of FIG.

  As shown in FIG. 1, the pipe joint according to the present invention includes a joint body 1, a resin short pipe 2, an outer ring 3, a retaining ring 4, and a seal ring 5 as main constituent members.

  As shown in FIGS. 1 to 3, the joint body 1 is made of metal, resin, or the like, and has an opening 6 that allows insertion of a resin short tube 2 at one end, and an inner periphery of the opening 6. An annular retaining groove 7 is provided, and a male screw 8 that can be screwed into an instrument such as a water tap or a valve is provided on the outer periphery of the other end. A cylindrical groove 9 is formed concentrically with the shaft center of the joint body 1 in the interior of the receiving portion 6 of the joint body 1. A polygonal tool hanging portion 1 a is provided on the outer periphery of the receiving portion 6 of the joint body 1. In the illustrated example, the joint body 1 is a straight type, but may be an elbow type or a tee type. Moreover, although the joint main body 1 of the example of illustration has the external thread 8 provided in the outer periphery of the other end of this, an internal thread may be provided in the inner periphery of the other end.

  The resin short tube 2 is formed of a resin material such as polybutene, polyethylene, or vinyl chloride in a straight shape or an elbow shape not shown in the drawing. A cylindrical projecting portion 10 projecting forward is formed concentrically with the cylindrical axis of the resin short tube 2 at the distal end portion on the insertion side of the resin short tube 2 inserted into the receiving port 6 of the joint body 1. Provided. The cylindrical protrusion 10 is formed in a shape that fits into the cylindrical groove 9 when the resin short tube 2 is inserted into the receiving port 6. When the resin short pipe 2 is connected to the receiving portion 6 of the joint body 1 so as to be relatively rotatable, the cylindrical projection 10 is inserted into the cylindrical groove 9 as shown in FIG. A gap is formed between the protruding portion 10 and the cylindrical groove 9 so as to be loosely fitted. The inner diameter of the rear end opening of the resin short tube 2 is a resin tube P made of a resin material such as polybutene, polyethylene, or vinyl chloride, as shown by a two-dot chain line in FIG. One end of each is inserted and can be joined by heat fusion or electric fusion. As a joining means between the resin short tube 2 and one end portion of the resin pipe P, an adhesive means can be used in addition to the heat fusion / electric fusion.

  The outer ring 3 is made of a metal material such as a copper alloy, hard resin, or the like. The outer ring 3 is provided with an annular retaining ring receiving groove 11 on the outer periphery, and is attached to the outer periphery of the resin short tube 2. When mounting, as shown in FIG. 3A, an annular groove 12 is provided on the outer periphery of the resin short tube 2, while the outer ring 3 is composed of a pair of semicircular split rings 3a and 3b. Then, as shown in FIG. 3B, the split rings 3a and 3b are fitted in the concave groove 12 of the resin short tube 2 in a conjugated manner, and the retaining ring receiving concave grooves on the outer periphery of the split rings 3a and 3b. 11 is installed by loosely fitting the retaining ring 4, and this mounting state is maintained.

  The retaining ring 4 is made of stainless steel or the like, and is formed in a cross-sectional C shape having an opening 4a (see FIG. 3B) in a part of the circumference so as to be capable of expanding and contracting the diameter. The retaining ring 4 has an inner diameter portion smaller than the outer diameter of the outer peripheral portion provided with the retaining ring receiving groove 11 of the outer ring 3 in a free state, and the outer diameter portion is formed larger than the outer diameter. Then, it is housed in the retaining ring housing groove 11 in a loose fit.

  As for the positional relationship between the retaining groove 7 of the joint body 1 and the retaining ring receiving recessed groove 11 of the outer ring 3, the resin short tube 2 is fitted with the outer ring 3 and the retaining ring 4 as shown in FIG. In this state, when the coupling body 1 is inserted to a predetermined depth into the receiving portion 6, the retaining groove 7 is set so as to correspond to the outer periphery of the retaining ring housing concave groove 11. Yes.

  The seal ring 5 is made of an O-ring or the like and has an inner diameter portion that is smaller than the outer diameter of the distal end portion of the resin short tube 2, and is formed so as to be housed inside the receiving portion 6 of the joint body 1. .

Next, the assembly procedure of the pipe joint will be described with reference to FIGS. 3 (a) and 3 (b).
First, a pair of split rings 3a and 3b of the outer ring 3 shown in FIG. 3 (a) are fitted into the concave groove 12 of the resin short tube 2 in a conjugating manner, and a retaining ring on the outer periphery of the split rings 3a and 3b. The outer ring 3 is attached to the resin short tube 2 by loosely fitting the retaining ring 4 into the housing concave groove 11 (see FIG. 3B).
Thereafter, when the resin short tube 2 is inserted into the receiving portion 6 of the joint body 1 to a predetermined depth where the cylindrical projection 10 is fitted into the cylindrical groove 9 while reducing the diameter of the retaining ring 4. As shown in FIGS. 1 and 2, the retaining ring receiving groove 11 and the retaining groove 7 are aligned with each other, and the retaining ring 4 in the retaining ring housing groove 11 is expanded by the elastic restoring action. When the outer diameter portion of the retaining ring 4 is engaged with the retaining groove 7, the resin short tube 2 is prevented from being removed from the receiving portion 6, and the seal ring 5 is connected to the joint body. 1 is compressed between the inner periphery of the receiving port 6 and the outer periphery of the distal end of the resin short tube 2, and a sealed state without water leakage is obtained between them.

  In this assembled state, the resin short pipe 2 can rotate relative to the joint body 1, so that even after the resin pipe P for water supply is joined to the resin short pipe 2 as shown in FIG. The male screw 8 can be screwed into an instrument (not shown) such as a water tap and a valve, and the joint body 1 can be easily attached to the instrument.

  As described above, according to the state in which the outer diameter portion of the retaining ring 4 is engaged with the retaining groove 7 in a retaining shape, the resin short tube 2 together with the resin tube P is pulled out in the direction of withdrawal after construction. Even if it is strongly pulled, the outer diameter portion of the retaining ring 4 increases the engaging force with respect to the retaining groove 7, so that the resin short tube 2 can be reliably prevented from coming out of the receiving portion 6.

In the above embodiment, the outer ring 3 is composed of a pair of semicircular split rings 3a and 3b, but instead, the outer ring 3 is formed in a non-divided cylindrical shape, which is formed by the resin short tube 2 It can also be integrally formed on the outer periphery of the resin short tube 2 at the same time as the resin molding.
Further, in the above embodiment, the resin short tube 2 is connected to the receiving portion 6 of the joint body 1 so as to be relatively rotated, and the cylindrical protrusion 10 at the tip of the resin short tube 2 is a cylinder in the joint body 1. If the resin short tube 2 does not need to be rotated, the cylindrical protrusion 10 at the tip of the resin short tube 2 is formed into a cylindrical shape in the joint body 1. The thickness dimension of the cylindrical protruding portion 10 and the groove width dimension of the cylindrical groove portion 9 are set so that they can be press-fitted into the groove portion 9, and the surface pressure in the radial direction between the cylindrical protruding portion 10 and the cylindrical groove portion 9 along with the press-fitting Can be configured to form a seal portion. According to this, the effect of preventing leakage of water flowing through the joint body 1 can be further enhanced. In this case, only the outer peripheral surface or only the inner peripheral surface of the cylindrical protruding portion 10 can be brought into close contact with the cylindrical groove portion 9 to constitute the seal portion.

In addition, although the said embodiment demonstrated the case where the other end part of the coupling main body 1 was connected to instruments, such as a water faucet, the same receptacle part as the receptacle part 6 of the one end side was also provided in the other end side of the coupling main body 1. The resin short pipe 2 having the same configuration as that of the resin short pipe 2 on one end side is similarly inserted and connected to the receiving portion so that the resin pipes P joined to the resin short pipes 2 on both ends are connected to each other. It can also be set as the pipe joint of the form which connects.
Moreover, in the said embodiment, although the seal ring 5 is interposed between the outer periphery of the cylindrical protrusion part 10 at the front-end | tip of the resin short tube 2, and the inner periphery of the receiving part 6 of the coupling main body 1, it replaces with this. As shown in FIG. 4, the seal ring 5 can also be interposed between the inner diameter portion of the cylindrical groove portion 9 of the joint body 1 and the inner periphery of the cylindrical projection portion 10 at the tip of the resin short tube 2.

1 is a half-broken cross-sectional view of a pipe joint showing an embodiment of the present invention. It is an enlarged view of the A section in FIG. It is sectional drawing which shows the assembly process of the pipe joint of FIG. It is sectional drawing which shows another Example corresponding to FIG. It is a half notched cross-sectional view of a conventional pipe joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint body 2 Resin short pipe 3 Outer ring 4 Retaining ring 5 Seal ring 6 Receiving part 7 Retaining groove 9 Cylindrical groove part 10 Cylindrical protrusion part 11 Retaining ring accommodation concave groove

Claims (6)

  A joint main body having a receiving part at least at one end, a resin short pipe inserted into the receiving part of the joint main body, and an annular retaining ring receiving recess attached to the outer periphery of the resin short pipe An outer ring having a groove, and a retaining ring that is loosely fitted in the retaining ring housing concave groove, has an outer diameter portion larger than the outer diameter of the resin short tube in a free state, and is freely expandable and contractible. A seal ring interposed between the insertion side tip of the resin short tube inserted into the receiving portion and the overlapping surface of the receiving portion, and an inner circumference of the receiving portion of the joint body The annular retaining groove corresponds to the outer periphery of the retaining ring housing recess groove of the outer ring inserted into the receiving portion with the outer ring attached to the resin short pipe. The resin short pipe has a reduced diameter with respect to the retaining ring. The retaining ring is expanded in diameter when inserted into the receiving part to a predetermined depth, and the outer diameter part of the retaining ring is engaged with the retaining groove in a retaining manner. A pipe joint characterized by comprising.   The pipe joint according to claim 1, wherein one end of a resin pipe is joined to the resin short pipe.   The pipe joint according to claim 1 or 2, wherein the resin short pipe is inserted into the receiving portion so as to be relatively rotatable.   The pipe joint according to any one of claims 1 to 3, wherein the outer ring includes a pair of semicircular split rings.   The pipe joint according to any one of claims 1 to 3, wherein the outer ring is integrally formed on an outer periphery of the resin short pipe. A cylindrical projecting portion projecting in the forward direction is formed at the distal end portion on the insertion side of the resin short tube, while a radial surface is formed in the inner portion of the receiving portion as the cylindrical projecting portion is press-fitted. The pipe joint according to any one of claims 1, 2, 4, and 5, wherein a cylindrical groove part that generates pressure to form a seal part is formed.

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