JP4460838B2 - 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). Further, there is a type in which a confirmation window hole is formed in a part of the outer periphery of the joint body so that a predetermined amount of insertion of the pipe into the joint body can be visually confirmed directly from the outside (for example, see Patent Document 3).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-2377 [Patent Document 2]
Japanese Patent Laid-Open No. 11-118081 [Patent Document 3]
Japanese Patent Laid-Open No. 2002-81587
[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. In addition, in the above-mentioned plug-in type pipe joint with a confirmation window hole, not only drilling is required, but there are cases where the field of view is narrow and it is difficult to accurately confirm the amount of tube insertion. There was a risk of reducing the strength of the joint body if a large gap was made.
[0005]
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. Another object of the present invention is to provide a plug-in type pipe joint in which the amount of pipe insertion can be easily confirmed without particularly opening a confirmation window hole.
[0006]
[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 made of a transparent material and formed separately from the joint body. Thus, it is coupled to the joint body so as to form a pipe insertion gap between the outer periphery of the inner cylinder. 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 made of a wire, and the entire retaining ring is formed so as to be capable of expanding and contracting, and an inner tooth portion of the retaining ring is provided with biting teeth that bite into the outer peripheral surface of the tube.
A recess for accommodating the retaining ring is provided on the inner periphery of the outer cylindrical body, and a force in the diameter reducing direction is applied to the retaining ring when the tube moves in the withdrawal direction. An outer constricting tapered pressing surface is formed.
[0007]
The tapered ring is in a state where its inner diameter portion is in contact with the elastic seal ring and its outer diameter portion is in contact with the retaining ring before the tube is inserted into the tube insertion gap. In the state, it is fitted into the tube insertion gap, and the inner diameter portion is pushed forward by one end portion of the tube and moves toward the inner side of the tube insertion gap, so that the elastic seal ring is compressed and deformed forward. A taper is formed, and a contact portion that expands the retaining ring when the elastic seal ring is compressed and deformed by the taper of the inner diameter portion is formed in the outer diameter portion.
[0008]
According to the plug-in type pipe joint having the above configuration, when one end of the pipe is inserted into the pipe insertion gap of the joint body, the elastic seal ring seals between the inner peripheral surface of the pipe and the outer peripheral surface of the inner cylindrical body. The biting teeth of the retaining ring bite into the outer peripheral surface of the tube. This can prevent the pipe from coming out of the pipe insertion gap of the joint body.
[0009]
Through the outer cylindrical body that can be seen through, the amount and state of insertion of the tube can be confirmed in a wide range of views.
[0010]
If a tapered ring with a taper that expands forward at the inner diameter portion is fitted in the pipe insertion gap, the tapered ring will move into the pipe insertion gap as one end of the pipe is inserted into the pipe insertion gap. It is pushed inward in the axial direction toward the back, and the elastic seal ring is pushed into the seal ring groove of the inner cylinder while being compressed by the taper of the tapered ring, so that one end of the tube bumps into the elastic seal ring Insert smoothly.
[0011]
The retaining ring is made of a wire and is housed in a concave portion on the inner periphery of the outer cylinder, and the inner periphery of the concave portion is an outer surface that applies a force in the diameter reducing direction to the retaining ring when the tube moves in the withdrawal direction. When the tube is pulled in the pulling 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 cylinder. The diameter of the ring is reduced, and the reduction of the diameter increases the biting of biting teeth into the outer peripheral surface of the pipe, thereby obtaining a reliable pull-out preventing force of the pipe.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a half-broken portion of a plug-in pipe joint of a reference example, FIG. 2 is a front view of a retaining ring incorporated in the plug-in pipe joint, FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 5 is a half-notch cross-sectional view with the tube inserted most deeply.
[0013]
(Reference example)
In FIG. 1, the plug-in type pipe joint includes a joint body 1 provided with an elastic seal ring 2 and a retaining ring 3, and further includes a tapered ring 4 as necessary.
[0014]
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 formed separately from the joint body 1 with a transparent or translucent resin material that can be seen through the inside. A female screw 8 to be screwed into a male screw 7 provided on the outer periphery of the joint body 1 is provided on the inner periphery of the one end portion. 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.
[0015]
The retaining ring 3 is a stainless steel product. As shown in FIGS. 2 and 3, the split grooves 10 are inserted into the inner diameter portion of the dish-shaped cross section at equal intervals in the circumferential direction, and can be expanded and contracted with elasticity. The biting 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.
In addition, when the insert molding is performed, the outer cylinder body 6 having the shape of the taper 12 for biting tooth escape can be easily injection-molded with a simple mold structure by using the spacer 13, but without necessarily using the spacer 13, The retaining ring 3 can be insert-molded into the outer cylindrical body 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 the outer cylindrical body 6 before screwing and coupling the outer cylinder body 6 to the joint body 1. The outer cylinder body 6 is screwed and 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. Since the ring 2 is abutted against the outer periphery of the ring 2 and compressed while being pushed into the seal ring groove 16, the tube P is elastically sealed even if the inner periphery of one end of the tube P is not chamfered in advance. It can be inserted smoothly without sticking to the ring 2.
At this time, since the insertion state and the insertion amount of the pipe P can be visually confirmed through the outer cylinder 6, it is possible to prevent insufficient insertion and the like.
[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 cylinder 5 is sealed, and a retaining state of the tube P in which the biting teeth 11 of the retaining ring 3 lightly bite into the outer peripheral surface of the tube P is obtained.
[0021]
When the tube P is pulled in the extraction direction a, 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. Therefore, the pipe P is reliably prevented from coming out from 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]
(Example)
5 and 6 show an embodiment. In the embodiment, the retaining ring 3 and the mounting method of the retaining ring 3 to the outer cylinder 6 are different from those of the reference example, and other configurations are the same as those of the reference example. The same reference numerals are given to the elements, and the description thereof is omitted. The retaining ring 3 is made of a wire material such as stainless steel, and a biting tooth 11 that bites into the outer peripheral surface of the tube P inserted into the tube insertion gap 15 is provided on the inner periphery of the retaining ring 3. 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 cylindrical body 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. The outer tapered tapered pressing surface 19 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, without using such a spacer 20, the concave portion 18 can be formed on the inner periphery of the outer cylinder 6 simultaneously with the molding.
[0025]
As in the case of the reference example, one end of the pipe P is inserted into the pipe insertion gap 15 between the inner and outer cylindrical bodies 5 and 6 as shown in FIG. At this time, one end of the tube 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 a forwardly expanding taper 17 formed on the inner diameter portion of the tapered ring 4 is formed on the inner cylinder 5. Abutting on the outer peripheral portion of the elastic seal ring 2 protruding from the seal ring groove 16, the ring 2 is compressed and deformed and pushed into the seal ring groove 16. At this time, the contact portion 21 formed on the outer diameter portion of the tapered ring 4 also enlarges the retaining ring 3. At this time, since the insertion state and the insertion amount of the pipe P can be visually confirmed through the outer cylinder 6, it is possible to prevent insufficient insertion and the like.
[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 it is more reliably prevented from coming out.
As in the case of the reference example, 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. is there.
[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 of the tube can be easily and quickly inserted into a seal shape and a retaining shape, and since it has a collet-free structure, its structure and assembly are simplified, and costs are reduced. Moreover, it is easy to visually confirm the insertion amount of the pipe through the see-through outer cylinder.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a half cutout of a plug-in pipe joint of a reference example.
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.
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 an embodiment corresponding to FIG.
6 is a half-broken cross-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 Tapered ring taper 18 Recessed part 19 Pressing surface 21 Contact part

Claims (1)

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 made of a transparent material and formed separately from the joint body. And coupled to the joint body so as to form a pipe insertion gap between the outer periphery of the inner cylinder body,
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 made of a wire, and the entire retaining ring is formed so as to be capable of expanding and contracting, and an inner tooth portion of the retaining ring is provided with biting teeth that bite into the outer peripheral surface of the tube.
A recess for accommodating the retaining ring is provided on the inner periphery of the outer cylindrical body, and a force in the diameter reducing direction is applied to the retaining ring when the tube moves in the withdrawal direction. An outer constricted tapered pressing surface is formed,
The tapered ring is in a state where its inner diameter portion is in contact with the elastic seal ring and its outer diameter portion is in contact with the retaining ring before the tube is inserted into the tube insertion gap. fitted into the pipe insertion gap in the state, the inner diameter portion shaped front spread to compressive deformation of the resilient sealing ring when moving towards pushed to one end of the tube to the inner depths of the tube insertion gap the taper is formed, is in the outer diameter portion, characterized in that the contact portion to which the retainer ring also increase the diameter is formed when the elastic sealing ring is compressed and deformed by the taper of the inner diameter portion , Plug-in fittings.

Images