JP4268811B2 - Plug-in fittings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insertion-type pipe joint that can be used for hot water supply / water supply piping and the like, and that allows one end portion of a pipe to be simply and quickly inserted and connected in a seal shape and a retaining shape.
[0002]
[Prior art]
As this type of plug-in type pipe joint, an elastic seal ring that is in close contact with the outer peripheral surface of the pipe to be inserted and a collet integrally formed with biting teeth that bite into the outer peripheral surface of the pipe are incorporated in the joint body. (For example, refer to Patent Document 1). Also, an elastic seal ring that closely contacts the outer peripheral surface of the pipe to be inserted and a collet are incorporated inside the joint body, but a lock ring having a claw portion that bites into the outer peripheral surface of the pipe is formed separately from the collet and incorporated. (For example, refer to Patent Document 2).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-2377 [Patent Document 2]
Japanese Patent Application Laid-Open No. 11-118081
[Problems to be solved by the invention]
However, in the plug-in type pipe joint incorporating the collet, the number of assembling steps increases, the structure becomes complicated, and the cost increases.
SUMMARY OF THE INVENTION An object of the present invention is to solve such problems, and is to provide a plug-in pipe joint having a relatively simple structure and low cost by making it colletless.
[0005]
[Means for Solving the Problems]
The plug-in type pipe joint of the present invention includes an elastic seal ring, a retaining ring, and a tapered ring in the joint body. The joint body has an inner / outer double cylinder at one end in the axial direction, the inner cylinder is formed integrally with the joint body, and the outer cylinder is formed separately from the joint body. The joint body is coupled to form a tube insertion gap with the outer periphery of the joint. A seal ring groove is formed on the outer periphery of the inner cylindrical body, and the elastic seal ring has an outer diameter smaller than an outer diameter of a pipe inserted into the pipe insertion gap and larger than an inner diameter in the seal ring groove. Is inserted. The retaining ring is disposed inside the outer cylindrical body, and is provided with an enveloping tooth that can be expanded and contracted and that can be deformed into an outer diameter of the tube. The tapered ring has a taper that is widened forward at the inner diameter portion, and the tapered ring has an axially outer portion than the elastic seal ring on the outer periphery of the inner cylinder, and an inner periphery of the outer cylinder. Between the retaining ring and the axially inner portion, the front end portion is fitted so as to move inward in the axial direction toward the inner depth of the tube insertion gap while being pushed by one end portion of the tube. Is.
[0006]
As one preferred embodiment, the plug-in type pipe joint according to the present invention is provided with a biting tooth having elasticity that bites into an outer peripheral surface of the pipe while the retaining ring is pushed open by insertion of the pipe, The retaining ring can be insert-molded into the outer cylinder by molding with a resin material. Further, the retaining ring is made of a wire material and is housed in a concave portion on the inner periphery of the outer cylinder, and the inner periphery of the concave portion has a diameter-reducing direction on the retaining ring when the tube moves in the withdrawal direction. It is also possible to form a constricted tapered pressing surface on which a force is applied.
[0007]
According to the insertion-type pipe joint having the above-described configuration, as one end of the pipe is inserted into the pipe insertion gap, the tapered ring is pushed inward in the axial direction toward the inside of the pipe insertion gap. The elastic seal ring is pressed into the seal ring groove of the inner cylinder while being compressed by the taper of the ring, so that the pipe will stick to the elastic seal ring without chamfering the inner circumference of one end of the pipe in advance. Inserted smoothly.
[0008]
When one end of the tube is inserted into the tube insertion gap of the joint body, the elastic seal ring seals the space between the inner peripheral surface of the tube and the outer peripheral surface of the inner cylinder, and the biting teeth of the retaining ring are connected to the outer periphery of the tube. Cut into the surface. This can prevent the pipe from coming out of the pipe insertion gap of the joint body.
[0009]
If the retaining ring is integrated with the outer cylinder body by insert molding to the outer cylinder body, the outer cylinder body is coupled to the joint body, and the assembled state of the retaining ring can be obtained at the same time. Assembling work can be omitted.
[0010]
The retaining ring is made of wire and is housed in a recess on the inner periphery of the outer cylinder, and the inner periphery of the recess is an outer constriction that applies a force in the diameter reducing direction to the retaining ring when the tube moves in the withdrawal direction. By forming a round taper-shaped pressing surface, when the tube is pulled in the extracting direction, the outer peripheral surface of the retaining ring that moves in the same direction as the tube contacts the pressing surface of the outer cylindrical body. The diameter is reduced, and the reduction of the diameter increases the biting of the biting teeth on the outer peripheral surface of the pipe, thereby obtaining a reliable pull-out preventing force of the pipe.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described with reference to the drawings. 1 is a half cutaway cross-sectional view of the plug-in type pipe joint of the first embodiment, FIG. 2 is a front view of a retaining ring incorporated in the plug-in type pipe joint, and FIG. 3 is a cross-sectional view taken along line AA in FIG. 4 is a half-broken sectional view of the tube inserted most deeply.
[0012]
(First embodiment)
In FIG. 1, the plug-in type pipe joint includes a joint body 1 including an elastic seal ring 2, a retaining ring 3, and a tapered ring 4.
[0013]
The joint body 1 is formed in a cylindrical shape from a bronze casting or the like, and has a structure having inner and outer double tubular bodies 5 and 6 at one end in the axial direction thereof. Among them, the inner cylinder 5 is formed integrally with the joint body 1, but the outer cylinder 6 is resin-molded separately from the joint body 1, and is provided on the outer periphery of the joint body 1 at one end inner periphery thereof. A female screw 8 to be screwed into the male screw 7 is provided. A male screw 9 is cut on the outer periphery of the other axial end of the joint body 1, and a water tap or an elbow with a female screw (not shown) is screwed into the male screw 9.
[0014]
The retaining ring 3 is a stainless steel product, and as shown in FIGS. 2 and 3, the slits 10 are inserted into the inner diameter portion of the dish-shaped cross section at equal intervals in the circumferential direction, and elastically expandable / reducible diameter deformable bite. Teeth 11 are arranged in a row. The retaining ring 3 is insert-molded into the outer cylinder 6. At the time of this insert molding, for example, a spacer 13 is prepared which is preliminarily formed into a cylindrical shape and is provided with a resin-molded spacer 12 on the inner periphery of one end portion with a taper 12 for tooth escaping. The retaining ring 3 is overlaid on the outer ring body 6 and the retainer 14 is held on the outer side of the retaining ring 3 in the mold so that the outer tubular body 6 is injection-molded at the same time. It is insert-molded integrally with the inner periphery. For the resin material of the outer cylindrical body 6 and the spacer 13, for example, a transparent resin having excellent heat resistance such as PPSU (polyphenylsulfone), polycarbonate, and ABS resin is used.
[0015]
In the insert molding, by using the spacer 13, the outer cylindrical body 6 having the shape of the taper 12 for biting tooth escape can be easily injection-molded with a simple mold structure. The ring 3 can also be insert-molded into the outer cylinder 6. Further, the retainer 14 is not always necessary.
[0016]
Thus, the outer cylinder 6 integrally formed with the retaining ring 3 is screwed into the male screw 7 of the joint body 1 with the female screw 8 at one end of the outer cylindrical body 6, thereby connecting the outer cylinder 6 and the outer circumference of the inner cylinder 5. A tube insertion gap 15 is formed between them.
[0017]
One or more seal ring grooves 16 (two in the illustrated example) are provided on the outer periphery of the inner cylindrical body 5, and the seal ring groove 16 is made of a resin such as a polybutene pipe inserted into the tube insertion gap 15. An elastic seal ring 2 made of an O-ring or the like having an outer diameter smaller than the outer diameter of the pipe P and larger than the inner diameter is in close contact with the inner peripheral surface of the pipe P. This fitting can be easily performed by performing before fitting the outer cylindrical body 6 to the joint body 1. The outer cylinder 6 is coupled to the joint body 1 after the elastic seal ring 2 is fitted.
[0018]
The tapered ring 4 is a resin molded product such as nylon, and a forwardly expanding taper 17 gradually narrowing from the front end portion toward the rear is formed on the inner diameter portion. The tapered ring 4 is incorporated so as to be positioned in an axially outer portion than the elastic seal ring 2 on the outer periphery of the inner cylindrical body 5.
[0019]
Next, a usage mode of the plug-in type pipe joint having the above configuration will be described. In the on-site construction, first, the pipe P is cut to a required length. As shown in FIG. 4, one end of the cut pipe P is inserted into the pipe insertion gap 15 between the inner and outer cylinders 5 and 6. At this time, one end of the pipe P is inserted into the retaining ring 3. The biting teeth 11 are inserted while being pushed open in the direction of the taper 12. With this insertion, the tapered ring 4 is pushed inwardly into the tube insertion gap 15 at one end of the tube P, and the taper 17 of the tapered ring 4 protrudes from the seal ring groove 16 of the inner cylinder 5. The ring 2 abuts on the outer peripheral portion of the ring 2 to compress the ring 2 and pushes it into the seal ring groove 16 to pass therethrough. Therefore, even if the inner periphery of the one end of the pipe P is not chamfered in advance, the pipe P can be smoothly inserted without sticking to the elastic seal ring 2.
[0020]
When the pipe P is inserted into the joint body 1 to a predetermined depth, the elastic seal ring 2 is compressed and brought into close contact with the inner peripheral surface of the pipe P. A space between the outer peripheral surface of the cylindrical body 5 is sealed, and a retaining state of the tube P in which the biting teeth 11 of the retaining ring 3 have bitten into the outer peripheral surface of the tube P is obtained.
[0021]
When the tube P is pulled in the extraction direction, the inner diameter portion of the retaining ring 3 that moves in the same direction as the tube P is elastically deformed in a reduced diameter, and the biting of the biting teeth 11 on the outer peripheral surface of the tube P increases. The pipe P is reliably prevented from coming out of the pipe insertion gap 15.
[0022]
When the pipe P is removed from the joint body 1 from the inserted connection state of the pipe P, the pipe P is removed by loosening the tightening of the outer cylinder body 6 with the male screw 7 of the joint body 1 and removing the outer cylinder body 6 from the joint body 1. Can be removed from the joint body 1.
[0023]
(Second embodiment)
5 and 6 show a second embodiment. In this embodiment, the retaining ring 3 and the method of attaching the retaining ring 3 to the outer cylinder 6 are different from those of the first embodiment, and other configurations are the same as those of the first embodiment. The same reference numerals are assigned to the same members and the same elements, and the description thereof is omitted. The retaining ring 3 is made of a wire material such as stainless steel, and is provided with biting teeth 11 that bite into the outer peripheral surface of the tube P inserted into the tube insertion gap 15 on the inner periphery thereof. A part of the circumference is cut off, and the entire retaining ring 3 is formed to be capable of expanding and contracting in diameter.
[0024]
The retaining ring 3 is accommodated in a recess 18 provided on the inner periphery of the outer cylinder 6, and a force in the diameter reducing direction is applied to the retaining ring 3 on the inner peripheral surface on the axially outer side in the recess 18. An outer tapered taper pressing surface 19 to be applied is formed in a shape that narrows toward the opening end of the outer cylindrical body 6. As a means for providing the recess 18 on the inner periphery of the outer cylindrical body 6, a spacer 20, which is a separate body, is fitted into the outer cylindrical body 6, and the axially outer end surface of the spacer 20 and the pressing of the outer cylindrical body 6 A recess 18 is formed between the surface 19. Alternatively, the recess 18 can be formed simultaneously with the molding of the outer cylinder 6 without using such a spacer 20.
[0025]
As in the case of the first embodiment, the plug-type pipe joint configured in this way has one end of the pipe P in the pipe insertion gap 15 between the inner and outer cylinders 5 and 6, as shown in FIG. At this time, one end of the pipe P is inserted while pushing the retaining ring 3 open. With this insertion, the tapered ring 4 is pushed inwardly into the tube insertion gap 15 at one end of the tube P, and the taper 17 of the tapered ring 4 protrudes from the seal ring groove 16 of the inner cylinder 5. The ring 2 abuts on the outer peripheral portion of the ring 2 to compress the ring 2 and pushes it into the seal ring groove 16 to pass therethrough.
[0026]
When the pipe P is inserted into the joint body 1 to a predetermined depth, the elastic seal ring 2 is compressed and brought into close contact with the inner peripheral surface of the pipe P. A space between the outer peripheral surface of the cylindrical body 5 is sealed, and a retaining state of the tube P in which the biting teeth 11 of the retaining ring 3 have bitten into the outer peripheral surface of the tube P is obtained.
[0027]
When the tube P is pulled in the extraction direction, the outer peripheral surface of the retaining ring 3 that moves in the same direction as the tube P abuts against the pressing surface 19 of the outer cylinder 6, so that the retaining ring 3 is reduced in diameter, The biting of the biting teeth 11 on the outer peripheral surface of the tube P increases. In this way, the outer peripheral surface of the retaining ring 3 abuts against the pressing surface 19 of the outer cylindrical body 6 and the biting teeth 11 of the retaining ring 3 bite into the outer peripheral surface of the tube P. This is a state in which the slipping out is more reliably prevented.
It is possible to remove the outer cylinder body 6 and the pipe P from the joint body 1 by loosening the tightening of the outer cylinder body 6 with the male screw 7 from the inserted connection state of the pipe P as in the case of the first embodiment. It is the same.
[0028]
The present invention can be similarly applied to the case where the joint body 1 is an elbow or a T type other than the socket type shown in the drawing.
[0029]
【The invention's effect】
According to the present invention, one end portion of the tube can be easily and quickly inserted and connected in a seal shape and a retaining shape, and since the structure without the collet is used, the structure and the assembly are simplified and the cost is reduced. Is.
[Brief description of the drawings]
FIG. 1 is a half-cut cross-sectional view of an insertion-type pipe joint according to a first embodiment.
FIG. 2 is a front view of a retaining ring incorporated in the plug-in type pipe joint of FIG.
3 is a cross-sectional view taken along line AA in FIG. 2. FIG.
FIG. 4 is a cross-sectional view of a half-notch with the tube inserted most deeply.
FIG. 5 is a half cutaway cross-sectional view of an insertion-type pipe joint according to a second embodiment corresponding to FIG.
6 is a half-broken sectional view showing the plug-in type pipe joint of FIG. 5 corresponding to FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Joint body 2 Elastic seal ring 3 Stop ring 4 Tapered ring 5 Inner cylinder 6 Outer cylinder 11 Biting tooth 15 Pipe insertion gap 16 Seal ring groove 17 Taper 18 of taper ring Recess 19 Press surface

Claims (3)

The joint body is equipped with an elastic seal ring, retaining ring, and tapered ring.
The joint body has an inner / outer double cylinder at one end in the axial direction, the inner cylinder is formed integrally with the joint body, and the outer cylinder is formed separately from the joint body. It is connected to the joint body so as to form a pipe insertion gap with the outer periphery of
A seal ring groove is formed on the outer periphery of the inner cylindrical body, and the elastic seal ring has an outer diameter smaller than an outer diameter of a pipe inserted into the pipe insertion gap and larger than an inner diameter in the seal ring groove. Is inserted,
The retaining ring is disposed inside the outer cylindrical body, and is provided with an enveloping tooth that can be expanded and contracted in an inner diameter portion and that can be deformed to expand and contract.
The tapered ring has a taper that is widened forward at the inner diameter portion, and the tapered ring has an axially outer portion than the elastic seal ring on the outer periphery of the inner cylinder, and an inner periphery of the outer cylinder. Between the retaining ring and the axially inner portion, the front end portion is fitted so as to move inward in the axial direction toward the inner depth of the tube insertion gap while being pushed by one end portion of the tube. A plug-in type pipe joint characterized by that. The retaining ring is provided with biting teeth having elasticity that bites into the outer peripheral surface of the tube while being pushed open by insertion of the tube, and the outer cylinder is formed of a resin material, and the outer cylinder is The plug-in type pipe joint according to claim 1, wherein the retaining ring is insert-molded. The retaining ring is made of a wire and is accommodated in a concave portion on the inner periphery of the outer cylinder, and the inner periphery of the concave portion has a force in the diameter reducing direction on the retaining ring when the tube moves in the withdrawal direction. The plug-in type pipe joint according to claim 1, wherein a constricted taper-shaped pressing surface is provided.

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