JP3694661B2 - Synthetic pipe joints - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint that can be joined with one touch by inserting a synthetic resin pipe such as a polyethylene pipe used in waterworks, etc., and an annular elastic packing, a foreign matter intrusion prevention ring, and a retaining ring provided in the joint. Concerning structure.
[0002]
[Prior art]
A joint for inserting a polyethylene pipe so that it can be easily joined with one touch is known from Japanese Unexamined Patent Publication No. 2000-240867.
[0003]
[Problems to be solved by the invention]
By the way, this type of conventional joint has the following problems.
(1) Since the O-ring attached to the inner surface of the joint body for water sealing of the joint may be worn by the tip edge when the polyethylene pipe is inserted, the water sealing may be incomplete. Reliability is not enough in structure.
(2) If foreign matter such as sand adheres to the polyethylene pipe, when the polyethylene pipe is inserted, the foreign matter may bite into the O-ring and destroy the water seal.
(3) There is a possibility that the retaining ring provided to prevent the polyethylene tube from slipping out slides on the surface of the polyethylene tube, and the retaining function is not fully exhibited.
[0004]
[Means for Solving the Problems]
The joint for synthetic resin pipes according to the present invention intends to solve the above-mentioned problem, and is a cylindrical joint body in which an inward ridge against which the front end of the synthetic resin pipe inserted from the opening end stops is formed at the inner peripheral back part. A cylindrical threaded body in which a threaded portion that is screwed into the opening end of the joint body is formed at the front opening edge and the synthetic resin pipe is inserted through the rear opening, and an annular shape that is attached to the inner periphery of the cylindrical threaded body It consists of an elastic packing, a foreign matter intrusion prevention ring, and a retaining ring, and forms an expanded packing entry portion near the opening edge of the inner periphery of the joint body, and the outer periphery of the annular elastic packing on the inner periphery of the cylindrical screw Forming a countersink groove into which the part fits, forming a peripheral groove into which the outer peripheral part of the foreign matter intrusion prevention ring fits on the rear side of the countersink groove, the rear inner surface of the peripheral groove facing backward and a small diameter And a retaining ring is disposed in the tapered hole, and the inner peripheral surface of the retaining ring is the front The synthetic resin pipe is formed in a saw-tooth shape that can be engaged with the outer peripheral surface of the synthetic resin pipe, and the inner peripheral edge of the foreign matter intrusion prevention ring is formed with a rising edge that slides on the outer peripheral surface of the synthetic resin pipe. Is inserted into the joint body, the inner peripheral portion of the annular elastic packing is pressed against the outer peripheral surface of the synthetic resin tube and is pushed into the packing entry portion so as to be in close contact therewith.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a synthetic resin pipe joint according to the present invention, FIG. 2 is a longitudinal sectional view showing the combined state, and FIG. 3 is a view when a synthetic resin pipe p of a polyethylene pipe is inserted into the synthetic resin pipe joint. 1 is a tubular joint body made of a copper alloy, 2 is a tubular threaded body made of copper alloy, 3 is an annular elastic packing made of rubber attached to the inner periphery of the tubular threaded body, 4 Is a notch annular foreign object intrusion prevention ring made of hard plastic that is mounted on the inner periphery of the cylindrical threaded body, and 5 is a notched annular made of metal (stainless steel) that is also mounted on the inner periphery of the cylindrical threaded body. This is a retaining ring.
[0006]
The joint body 1 has a cylindrical shape, a male screw 7 is formed on the outer periphery of one opening end 6, and an enlarged packing entry portion 8 is formed near the opening end 6 on the inner periphery. An inward ridge 9 is formed in the part. An outer periphery 11 near the other opening end 10 is formed in an octagonal shape, and a female screw 12 is formed on the inner periphery thereof. Reference numeral 13 denotes a seat plate disposed on the side surface of the female screw 12 of the inward flange 9.
[0007]
The cylindrical threaded body 2 has a female threaded portion 15 that is threadedly engaged with the opening end 6 of the joint body 1 formed on the inner periphery of the front opening edge 16, and a countersink groove on the inner periphery of the rear side of the female threaded portion. 17 is formed, and the outer peripheral portion 18 of the annular elastic packing 3 having a square cross section as shown in FIG. The inner peripheral portion 19 of the annular elastic packing 3 has a substantially circular cross section. Further, a circumferential groove 20 into which the outer peripheral portion 14 of the foreign matter intrusion prevention ring 4 is fitted is formed on the rear side of the counter groove 17. The foreign matter intrusion prevention ring 4 is formed in an L-shaped cross section as shown in FIG. 5, and a standing edge 21 is formed on the inner peripheral edge thereof.
[0008]
The rear inner surface of the circumferential groove of the cylindrical threaded body 2 is formed in a tapered hole 22 having a small diameter toward the rear, and the retaining ring 5 is disposed in the tapered hole. As shown in FIG. 6, the retaining ring 5 has an outer peripheral surface 23 formed in a taper shape, and the inner peripheral surface 24 is set in a large-diameter direction by setting a scooping angle a in FIG. It is formed in the shape of a saw blade that stands up. The retaining ring 5 is made of dezinced brass and has a strength equivalent to that of stainless steel by nickel plating on the surface. Moreover, the outer periphery 25 of the cylindrical screwing body 2 is formed in octagon shape.
[0009]
By screwing the female screw portion 15 of the cylindrical screw 2 into the male screw 7 of the joint body 1, the joint main body 1 and the cylindrical screw 2 are combined as shown in FIGS. By inserting the synthetic resin pipe p from the rear opening 26 of the cylindrical threaded body 2, the synthetic resin pipe p penetrates through the retaining ring 5 and the foreign matter intrusion prevention ring 4 as shown in FIG. 3. By doing so, the inner peripheral portion 19 of the annular elastic packing 3 is pressed against the outer peripheral surface of the synthetic resin tube and pushed into the packing entry portion 8 to be in close contact therewith. And the synthetic resin pipe p can be joined by one-touch by making the front-end | tip of this synthetic resin pipe p stop to the inward ridge 9. FIG.
[0010]
The foreign matter intrusion prevention ring 4 is formed of a hard plastic into a notch ring shape, and when the synthetic resin pipe p penetrates the foreign matter intrusion prevention ring 4, the standing edge 21 is formed on the outer peripheral surface of the synthetic resin pipe p by its elasticity. Because of the sliding contact, even if foreign matter such as earth and sand is attached to the outer peripheral surface of the synthetic resin pipe p, the standing edge 21 prevents the foreign matter from entering the wipe. Further, the foreign matter intrusion prevention ring 4 is made of hard plastic and has an L-shaped cross section, and its outer peripheral portion 14 is fitted into the peripheral groove 20 of the cylindrical threaded body, so that the synthetic resin pipe p is inserted. Therefore, there is no fear of pulling and detaching, and the outer peripheral surface of the synthetic resin pipe p can always be wiped cleanly with a predetermined sliding contact force.
[0011]
The annular elastic packing 3 has an outer peripheral portion 18 having a square cross section, and the outer peripheral portion 18 is fitted into the counter feed groove 17, so that when the synthetic resin tube p is inserted, the outer peripheral surface of the synthetic resin tube Even if it is pulled strongly by this friction, the inner peripheral portion 19 can be guided to the packing entry portion 8 without detaching. Further, the inner peripheral portion 19 is formed in a substantially circular cross section, and is accommodated in a close contact state with the packing entry portion 8 being bent into an L-shaped cross section by insertion of the synthetic resin tube p. Even if a high water pressure is applied from the gap between the outer peripheral surface of p and the inner peripheral surface of the joint body 1, there is no possibility of inverting against the water pressure, and a high water sealing ability can be obtained. Therefore, it is possible to join with a high water honey property that can withstand high water pressure simply by inserting the synthetic resin pipe p.
[0012]
Further, when the inner peripheral surface 24 formed in the shape of a saw blade of the retaining ring 5 is engaged with the outer peripheral surface of the synthetic resin tube p inserted in this manner, and the synthetic resin tube p is pulled in the pulling direction, Since the retaining ring 5 moves together with the synthetic resin pipe p and decreases in diameter along the tapered hole 22 of the cylindrical screw body 2, the inner peripheral surface 24 seems to bite deeper into the outer peripheral surface of the synthetic resin pipe p. Therefore, the removal is surely prevented.
[0013]
In this embodiment, the male screw 7 is formed on the joint body 1 and the female screw portion 15 is formed on the cylindrical screw body 2. However, the female screw portion is formed on the joint main body 1, and the female screw portion 15 is formed on the cylindrical screw body 2. The present invention is not limited to this embodiment, such as forming a male screw to be screwed into the screw portion and reversing the male and female, and various modifications are possible.
[0014]
【The invention's effect】
Thus, the joint for synthetic resin pipes of the present invention includes a cylindrical joint body in which an inward ridge against which the tip of the synthetic resin pipe inserted from the open end is formed at the inner peripheral back portion, and an opening of the joint body A cylindrical threaded body in which a threaded portion is formed at the front opening edge and a synthetic resin pipe is inserted through the rear opening, an annular elastic packing and a foreign matter intrusion prevention ring mounted on the inner periphery of the cylindrical threaded body And a retaining ring, which is formed with an enlarged packing entry portion near the opening edge of the inner periphery of the joint body, and the outer periphery of the annular elastic packing is fitted to the inner periphery of the cylindrical threaded body. Forming a groove, forming a circumferential groove to which the outer peripheral portion of the foreign matter intrusion prevention ring fits on the rear side of the counter recess groove, and forming a rear inner surface of the circumferential groove in a tapered hole having a small diameter facing rearward. A retaining ring is disposed in the tapered hole, and the inner peripheral surface of the retaining ring stands forward and the outer peripheral surface of the synthetic resin pipe. It is formed in the shape of a saw blade that can be engaged, and a standing edge that slides on the outer peripheral surface of the synthetic resin tube is formed on the inner peripheral edge of the foreign matter intrusion prevention ring, and the annular shape when the synthetic resin tube is inserted into the joint body Since the inner peripheral part of the elastic packing is pressed against the outer peripheral surface of the synthetic resin tube and pushed into the packing entry part, the foreign substance is prevented from entering, and the high water pressure is simply inserted by inserting the synthetic resin pipe. There is a beneficial effect that the joining with a high water sealing ability that can withstand the heat is surely made.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a joint for synthetic resin pipe showing an embodiment of the present invention.
2 is a longitudinal sectional view showing a combined state of the joint for synthetic resin pipes of FIG. 1;
FIG. 3 is a longitudinal sectional view when a synthetic resin pipe is inserted into the synthetic resin pipe joint of FIG. 2;
FIG. 4 is a cross-sectional view of an annular elastic packing according to the present invention.
FIG. 5 is a cross-sectional view of a foreign matter intrusion prevention ring according to the present invention.
FIG. 6 is a cross-sectional view of a retaining ring according to the present invention.
[Explanation of symbols]
p Synthetic resin pipe 1 Joint body 2 Cylindrical threaded joint 3 Annular elastic packing 4 Foreign matter intrusion prevention ring 5 Retaining ring 6 Open end 7 Male screw 8 Packing entry portion 9 Inward flange 14 Outer peripheral portion 15 Female screw portion 16 Front opening edge 17 Countersink groove 18 Outer peripheral part 19 Inner peripheral part 20 Peripheral groove 21 Standing edge 22 Tapered hole 23 Outer peripheral face 24 Inner peripheral face 26 Rear opening

Claims (1)

  A cylindrical joint body with an inward ridge formed at the inner peripheral back, where the tip of the synthetic resin pipe inserted from the opening end stops, and a screw part screwed into the opening end of the joint body at the front opening edge Formed of a cylindrical threaded body through which a synthetic resin pipe is inserted from the rear opening, an annular elastic packing attached to the inner periphery of the cylindrical threaded body, a foreign matter intrusion prevention ring, and a retaining ring. An enlarged packing entrance portion is formed near the opening edge of the circumference, and a seat feed groove is formed on the inner circumference of the cylindrical threaded body so that the outer circumference of the annular elastic packing is fitted, and the rear side of the seat feed groove Forming a circumferential groove into which the outer peripheral portion of the foreign matter intrusion prevention ring is fitted, and forming a retaining ring in the tapered hole by forming a rear inner surface of the circumferential groove into a tapered hole having a small diameter toward the rear, The inner peripheral surface of the retaining ring is formed in a saw blade shape that stands up forward and can be engaged with the outer peripheral surface of the synthetic resin pipe. A rising edge is formed on the inner peripheral edge of the prevention ring so as to be in sliding contact with the outer peripheral surface of the synthetic resin tube, and when the synthetic resin tube is inserted into the joint body, the inner peripheral portion of the annular elastic packing is the outer peripheral surface of the synthetic resin tube. A joint for synthetic resin pipes, wherein the joint is pressed into the packing entry part and is brought into close contact therewith.

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