JP2003214574A - Tube coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To develop a tube coupling which omits even mortar filling work after finishing work by easily pressing a sealing rubber ring without using a connecting rod and a bolt in the tube coupling having a structure for pressing the sealing rubber ring from the tube inmost side. <P>SOLUTION: This tube coupling is constituted so as to be sealed by pressing and compressing the sealing rubber ring 4 filled in clearance between a spigot 3 outside surface and a socket 2 inside surface in the socket opening direction by a push ring by inserting a spigot 3 into a socket 2. The socket inmost end side surface 22 of the push ring 20 is formed as a taper surface for opening in the tube inside direction, and a block-shaped connecting piece 25 having a surface for closely contacting with this taper surface 22 and the socket inmost end side surface 5 is pressed in toward the radial directional outside from the inside of a tube. The push ring 20 is pressed in the shaft direction toward the sealing rubber ring 4 direction by contact of the taper surface 22. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint. 2. Description of the Related Art As a pipe joint, as shown in FIG. 5, an insertion port 3 formed at an end of one pipe 1 is inserted inside a receiving port 2 formed at an end of one pipe 1. The tapered storage portion 13 that is inserted and formed on the inner surface of the receiving port 2 and has a diameter that decreases toward the opening.
And sealing rubber ring 4 filled in the gap between the opening 3 and the outer surface
The connecting rod 6 and the bolt 7, which are extended with the back end face 5 of the mouth as a base surface, are extended in the opening direction of the mouth 2 as shown by the arrow, and are thereby compressed by the pressing ring 8 to seal. Pipe fittings are known. In FIG. 5, reference numeral 9 denotes a lock ring,
Reference numeral 0 denotes a set bolt for pressing the lock ring 9 into the storage groove 11 on the outer surface of the insertion opening. Reference numeral 12 denotes a lock ring storage groove on the inner surface of the receiving opening. When the set bolt 10 is not tightened, the lock ring 9 is completely stored. The depth is set to allow insertion of the insertion opening 3. By the way, in the pipe joint having the above structure, the number of connecting rods 6 and bolts 7 to be used is a minimum of four in the circumferential direction, usually 8 to 16, although it depends on the pipe diameter. Therefore, it is troublesome to fasten these many connecting rods and bolts one by one in a narrow pipe, and there is a problem that the work becomes difficult. Further, since the connecting rod 6, the bolt 7, and the like are exposed in the pipe, there is a problem that turbulence is generated in the fluid in the pipe due to formation of corrosion and irregularities. Then, when the above-mentioned construction is completed, the connecting rod 6 and the bolt 7 are covered with mortar so as to fill the mortar so that the surface becomes smooth. The workability is very poor because of the so-called hardening, and there is a problem that the work becomes difficult in this respect as well. SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a pipe joint having a structure in which a sealing rubber ring is pressed from the back of a pipe without using a connecting rod or a bolt. An object of the present invention is to develop a pipe joint that can press a sealing rubber ring and omit a mortar filling operation after the operation is completed. [0007] In order to achieve the above-mentioned object, the present invention includes a receptacle formed at an end of one pipe and an insertion port formed at an end of the other pipe. The pipe joint, which is configured to insert and seal a rubber ring for sealing filled in a gap between the outer surface of the insertion opening and the inner surface of the receiving opening, by pressing the pressing ring toward the opening of the receiving opening and compressing the sealing ring. The back end side face of the receiving port of the press ring is a tapered surface that opens in the pipe inward direction, and a block-shaped joint piece having a surface that comes into contact with the tapered face and the back end side face of the receiving port without a gap is press-fitted from inside the pipe toward the radial outside. The pressing ring is pressed in the axial direction toward the sealing rubber ring by the contact of the tapered surface. Therefore, according to this configuration, when pressing the sealing rubber ring, if a block-shaped joint piece is pressed between the pressing ring and the back end of the receiving port, a push rod or a bolt is used. The rubber ring for sealing can be pressed without
Work is facilitated. Furthermore, if the pipe inner surface side of the block-shaped joint piece is made flat, no turbulent flow is generated without filling with mortar or the like. Therefore, the mortar filling operation can be omitted. Next, an embodiment of the pipe joint of the present invention will be described. FIG. 1 is an enlarged sectional view of a main part of a pipe joint according to an embodiment of the present invention. The pipe joint of the present invention differs from the conventional pipe joint only in the structure for pressing the sealing rubber ring 4 in the axial direction. The other parts are the same. Detailed description is omitted. In FIG. 1, the pressing ring 20 has an end surface 21 in contact with the sealing rubber ring 4 and a tapered surface 22 on the back side of the receiving port 2.
And several divided pieces 2 in the circumferential direction as shown in FIG.
It has an annular shape divided into 3, 23. The tapered surface 22 of the pressing wheel 20 has a
Between the tapered surface 22 and the inner end surface 5 of the receiving port.
A block-shaped joint piece 25 having an inclined surface 24 that is in contact with the gap is forcibly press-fitted. The inclined angle of the tapered surface 22 is such that when the tapered surface 22 is forcibly inserted in the radial direction by driving or the like, an axial force is applied to the pressing ring 20 by the contact of the tapered surface 22 and an axial force is applied to the pipe joint. The inclination angle is set so that the joint piece 25 does not protrude in the pipe direction even when the directional compression force acts. As shown in FIG. 3, the joint piece 25 is a divided body 26 which forms one continuous ring as a whole, and as shown in FIG. 4, a divided body 27 which is not continuous in the circumferential direction. It is good. In FIG. 1, reference numeral 28 designates a cover plate extending from the inner surface of the press ring 20 to the inner surface of the inner end of the receiving port 2, and concealing irregularities on the inner surface of the receiving port 2 to prevent turbulence and vortices. This is to prevent occurrence. The cover plate 28 can be attached to the inner surface of the press wheel 20 with a bolt nut 29. Next, the joining means of the pipe joint of the present invention will be described. The lock ring 9, which can be split open, is stored in the lock ring storage groove 12 of the receptacle 2, and the insertion port 3 is inserted into the receptacle 2. If the lock ring 9 is inserted until the lock ring 9 is positioned on the lock ring engaging groove 11, the set bolt 10 is tightened to prevent the insertion hole from coming out. Next, a rubber ring 4 for sealing is provided between the outer surface of the insertion opening 3 and the inner surface of the receiving opening 2 from the inner surface of the pipe.
Is inserted, and the pressing ring 20 is further arranged following the sealing rubber ring 4. Then, the joint piece 25 is inserted between the tapered surface 22 on the rear surface of the pressing wheel 20 and the inner end surface 5 of the receiving port, and is pressed in radially outward. Due to the contact of the taper surface 22, the pressing ring 20 is converted from the radial pressing force into the axial pressing force, and the sealing rubber ring 4 is press-fitted in a compressed state between the outer surface of the insertion opening 3 and the inner surface of the receiving opening 2. Go. Therefore, the sealing rubber ring 4 is compressed only by driving the connecting piece 25, and the troublesome work of tightening a large number of connecting rods and bolts can be omitted at all. Then, if the cover plate 28 is attached to the inner surface of the pressing wheel 20 with the bolt nut 29, the pipe joining operation is completed. In this case, the mortar filling operation can be omitted completely, so that the operation is greatly simplified. According to the present invention, as described above, in a pipe joint of a type in which a pressing ring is pressed against a sealing rubber ring from the back side of a pipe to achieve sealing, the sealing rubber ring is pressed by the pressing ring. Since the pressing operation does not require a laborious operation such as a conventional connecting rod or bolt tightening operation or a difficult operation such as mortar filling, the pipe joining operation is greatly simplified.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged sectional view of a main part of an embodiment of the present invention. FIG. 2 is a front view of a pressing wheel according to the embodiment of the present invention. FIG. 3 is a front view of the joint piece according to the embodiment of the present invention. FIG. 4 is a front view of another joint piece according to the embodiment of the present invention. FIG. 5 is an explanatory sectional view of a conventional example. [Description of Signs] 1 Pipe 2 Receptacle 3 Insert 4 Seal rubber ring 5 Receptor back end face 20 Press ring 22 Taper face 25 Joint piece

Claims (1)

Claims: 1. An insertion opening formed at an end of another tube is inserted into a reception opening formed at an end of one tube, and the outer surface of the insertion opening and the reception opening are inserted. In a pipe joint configured to seal by pressing and compressing a rubber ring for sealing filled in the gap with the inner surface in the opening direction of the receiving port with the pressing ring, the back end side face of the receiving port of the pressing ring is inward in the pipe direction. A block-shaped joint piece having an open tapered surface and having a surface in contact with the tapered surface and the inner end side surface of the receiving port without a gap is press-fitted radially outward from the pipe, and the pressing ring is sealed by the contact of the tapered surface. Pipe joint that is pressed in the axial direction toward the rubber ring.