JP4810267B2 - Pipe fitting - Google Patents

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.

  For example, a pipe joint as shown in FIG. 3 has been proposed as a pipe joint used for piping such as water supply and hot water supply (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 appliance 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 21a and 24a 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 if 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 of 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 receiving portion as described in claim 1. A pipe joint including a seal ring interposed between an insertion side distal end portion of a resin short pipe inserted into the inside of the receiving portion and an inner periphery of the opening end of the receiving portion. An annular inward claw portion having a taper tapered toward the inside of the mouth and a vertical portion perpendicular to the axial direction is provided, and a receiving port is provided inward of the inward claw portion of the receiving portion. An annular inner wall of the receiving port projecting radially inward from the inner periphery of the portion is provided, and the seal ring is in close contact with the distal end surface of the insertion side distal end portion of the resin short tube on the inner wall of the receiving port An annular seal ring-accommodating concave groove is provided, and is inserted into the receiving portion of the resin short tube. The outer circumference parts, and scaling the diameter change type capable outward claw portion of the annular having a right angle of the vertical portion to the engaged target Subomari tapered and axially retaining shape provided in the inward claw portion A pipe joint, wherein the resin short pipe has a distal end surface of the insertion side distal end thereof as a seal ring with respect to the positional relationship between the inward claws of the joint body and the outward claws of the resin short pipe. It is characterized in that it is set so that the vertical part of the inward claw part and the vertical part of the outward claw part are engaged with each other when they are inserted into the receiving part until they are in close contact with each other. is there.
According to such a configuration, since the inward claw portion and the outward claw portion are engaged with each other only by press-fitting the resin short tube into the receiving portion of the joint body, the resin short tube is It can be easily and quickly connected to the joint body in a retaining manner and in a sealing manner.

  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 body can be screwed into an instrument such as a water tap and a valve, and can be easily attached by this screwing.

  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. The nut (press ring) having a polygonal tool hanger as shown in the figure can be omitted, and the outer diameter of the tool hanger of the joint body can be reduced accordingly, thereby reducing costs, downsizing and downsizing. It is possible to reduce the tightening work of the nut, and it is easy to insert the resin short pipe into the joint receiving part. The assembly workability is excellent, and the nut is loosened and tightened after installation. The shortage problem can be solved and the occurrence of a water leak accident can be surely prevented.

  A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a half-broken cross-sectional view of a pipe joint showing an embodiment of the present invention, and FIG. 2 is a half-broken cross-sectional view showing the joint body and resin short pipe 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, and a seal ring 3 as main constituent members.

  As shown in FIG. 1 and FIG. 2 (a), the joint body 1 is made of a metal material, a resin material, or the like, and opens a receiving portion 4 that allows a resin short tube 2 to be inserted at one end. An annular inward claw portion 5 having a serrated cross section having a taper 5a narrowed toward the inner side of the receiving portion and a vertical portion 5b perpendicular to the axial direction is provided on the inner periphery of the open end of the opening 4. An annular inner wall 6 is provided in the inner portion of the receiving portion 4 that protrudes radially inward from the inner periphery of the receiving portion 4, and an annular seal is provided on the inner inner wall 6. A ring receiving groove 7 is provided concentrically with the axis of the joint body 1. A seal ring 3 is accommodated in the seal ring receiving groove 7 so that a part of the circumference protrudes into the receiving portion 4 so as to be in close contact with the distal end surface 2b of the insertion side distal end portion 2a to the receiving portion 4 of the resin short tube 2. The On the outer periphery of the other end of the joint body 1, a male screw 8 that can be screwed into an instrument such as a water tap or a valve is provided. A polygonal tool hanging portion 1 a is provided on the outer periphery of the receiving portion 4 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.

  As shown in FIGS. 1 and 2 (a), the resin short tube 2 is formed of a resin material such as polybutene, polyethylene, or vinyl chloride in a straight shape as shown in the drawing or an elbow shape outside the drawing. The insertion-side tip 2a of the resin short tube 2 to the receiving port 4 is formed with a small diameter that can be inserted into the receiving port 4 of the joint body 1 so as to be relatively rotatable. An outwardly deformable outward claw that is formed in a sawtooth shape that is opposite to the cross-sectional sawtooth shape of the inward claw portion 5 and has a tapered taper 9a and a vertical portion 9b that is perpendicular to the axial direction. The part 9 is provided in an annular shape. 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.

  As for the positional relationship between the inward claw portion 5 of the joint body 1 and the outward claw portion 9 of the resin short tube 2, as shown in FIG. 1, the resin short tube 2 is connected to the distal end of the insertion side distal end portion 2a. When the surface 2b is inserted into the receiving portion 4 until the surface 2b comes into close contact with the seal ring 3, the inward claw portion 5 and the outward claw portion 9 are set to engage with each other in a retaining manner.

Next, an assembling procedure of the pipe joint will be described.
First, as shown in FIG. 2, the seal ring 3 is housed in the seal ring housing groove 7 in the joint body 1. Next, the receiving end 4 a of the joint body 1 is press-fitted into the insertion-side tip 2 a of the resin short pipe 2, or the insertion-side tip 2 a of the resin short pipe 2 is press-fitted into the receiving part 4 of the joint main body 1. To do. Along with the press-fitting, the outward claw portion 9 of the resin short pipe 2 is brought into sliding contact with the taper 5a of the inward claw portion 5 in the joint body 1 and is reduced in diameter by the inward claw portion 5. However, it gets over the inward claw portion 5 and engages so that the vertical portion 9b faces the vertical portion 5b of the inward claw portion 5 by elastic restoring action (see FIG. 1). By this engagement, a state in which the resin short tube 2 is prevented from coming out of the receiving portion 4 is obtained. As shown in FIG. 1, the outward claw portion 9 of the resin short tube 2 engages with the inward claw portion 5 in the joint body 1, and at the same time, the distal end surface 2b of the insertion side distal end portion 2a of the resin short tube 2 is The seal ring 3 is compressed so as to be pressed into the seal ring receiving concave groove 7 and is brought into close contact with the seal ring 3 to obtain a sealed state without water leakage.

  In this assembled state, since the resin short pipe 2 can rotate relative to the joint body 1, the male screw 8 of the joint body 1 can be connected to the water tap even after the resin pipe P for water supply is joined to the resin short pipe 2. The joint body 1 can be easily attached to the device by screwing it into a device such as a valve (not shown).

  In the said embodiment, although the case where the other end part of the joint main body 1 was connected to instruments, such as a water faucet, was provided in the other end side of the joint main body 1, the same receptacle part as the receptacle part 4 of one end side was provided. Similarly, the resin short pipe 2 having the same configuration as that of the resin short pipe 2 at one end side is also inserted and connected to the receiving portion to connect the resin pipes P respectively joined to the resin short pipe 2 at both ends. It can also be set as the pipe joint of the form to do.

1 is a half-broken cross-sectional view of a pipe joint showing an embodiment of the present invention. FIG. 2 is a half-broken cross-sectional view showing a state before assembling a joint body and a resin short pipe of the pipe joint of FIG. 1. 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 tube 2a Insertion side tip of resin short tube 2b Tip end surface of insertion side tip of resin short tube 3 Seal ring 4 Receiving part 5 Inward claw part 5a Taper of inward claw part 6 Back wall in the receiving port 7 Sealing groove receiving groove 9 Outward claw 9a Taper of outward claw

Claims (3)

A joint body having a receiving part at least at one end, a resin short pipe inserted into the receiving part of the joint body, an insertion side tip part of the resin short pipe inserted into the receiving part, and the receiving part In a pipe joint provided with a seal ring interposed between the inside of the mouth part,
An annular inward claw portion having a taper tapered toward the inside of the receiving portion and a vertical portion perpendicular to the axial direction is provided on the inner periphery of the opening end of the receiving portion. An annular inner wall of the receiving port protruding radially inward from the inner periphery of the receiving portion is provided inward from the inward claw portion, and the seal ring is formed on the inner wall of the receiving port. An annular seal ring-accommodating concave groove that is accommodated in close contact with the distal end surface of the insertion-side distal end is provided,
An annular shape having a tapered shape and a perpendicular portion perpendicular to the axial direction, which is engaged with the inward claw portion in a retaining manner on the outer periphery of the insertion-side distal end portion of the resin short tube into the receiving portion. It is a pipe joint provided with an outward claw that can be expanded and contracted in diameter ,
Regarding the positional relationship between the inward claw portion of the joint body and the outward claw portion of the resin short tube, the resin short tube is placed in the receiving portion until the distal end surface of the insertion side distal end portion is in close contact with the seal ring. A pipe joint, wherein when inserted, the vertical part of the inward claw part and the vertical part of the outward claw part are set to engage with each other in a retaining manner .   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.

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