JP2004092798A - Resin joint for piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent displacement of a packing during a connecting operation by holding the packing on a piping resin joint side in a resin joint for piping having a corrugated pipe coated inside. <P>SOLUTION: A connection flange part 3 is attached to an end of a corrugated pipe 1 having an internal coated resin layer 2. A face plate part 13 extends to an end of the corrugated pipe 1 inserted through the connection flange part 3. An additional coated resin layer 21 formed by extending the internal coated resin layer 2 is overlaid to the face plate part 13. A packing 5 integrally has a packing main part 51 overlaid on the outside of the face plate part 13, and an attachment piece part 52 extending from the packing main part 51 in a folded fashion, and overlaid to the inside of the face plate part 13. The packing main part 51 and the attachment piece part 52 are arranged astride the face plate part 13, so that the packing 5 is held by the face plate part 13. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin joint for piping, and more particularly to a resin joint for piping that maintains liquid-tightness at a connection point with a pipe or another joint by packing.
[0002]
[Prior art]
Examples of this type of resin joint for piping (hereinafter referred to as “resin joint”) include a metal corrugated pipe having an inner coating resin layer having a connection flange attached to an end thereof, and a metal resin having an inner coating resin layer. There is known an end portion of a corrugated tube made of stainless steel, in which a tubular portion connected to an inner peripheral portion of a flange portion is joined, and a connecting flange portion is attached to the tubular portion. In both the former and the latter resin joints, the connection flange on the resin joint side and the mating flange provided on the pipe or another joint are brought into contact with each other, and then they are fastened with fasteners such as bolts and nuts. The flanges are pressed in a direction approaching each other by the tightening to connect the resin joint to the pipe or the joint. In such a construction, the liquid-tightness of the connection portion is maintained by interposing a packing between the connection flange portion and the mating flange portion. Conventionally, an independent part made of a disk-shaped resin molded product has been used as the packing.
[0003]
[Problems to be solved by the invention]
However, in the past, there was not only a trouble that the packing, which is a part separate from the resin joint, had to be carried into the piping construction site together with the resin joint, as well as a connection flange portion of the resin joint and a mating flange. There is a problem in that the packing interposed between the two flange portions is displaced during the work of abutting and tightening the parts, and the connection work cannot be performed smoothly.
Further, at the connection point between the resin joint and the pipe or another joint, a gap is inevitably generated between the end of the resin coating layer on the inner surface of the corrugated pipe of the resin joint and the packing, and the liquid flowing through the pipe line is in the gap. The liquid may come into contact with the metal surface of the corrugated tube and corrode that portion. In addition, when corrosion occurs in the corrugated pipe, particularly in a resin joint for piping, there is a problem that various inconveniences caused by the corrosion occur.
[0004]
The present invention has been made in view of the above circumstances and problems, and eliminates the inconvenience of carrying a packing as a separate part to a piping construction site together with the resin joint by integrally providing the packing with the resin joint. In addition, it is another object of the present invention to provide a piping resin joint in which there is no room for the packing to be displaced during the connection work of the resin joint.
[0005]
[Means for Solving the Problems]
In the resin joint for piping according to the present invention, a connection flange portion is attached to an end portion of a metal corrugated tube having an inner surface coating resin layer, and the connection flange portion abuts against a counterpart flange portion with a packing interposed therebetween. In a resin joint for piping joined in a state in which the flange portions are pressed in a direction approaching each other, the end of the corrugated pipe inserted into the center hole of the connection flange portion extends along the outer end surface of the connection flange portion. The face plate portion is extended, and on the face plate portion, an additional coating resin layer of the same material as the inner coating resin layer formed by extending the inner coating resin layer overlaps, and the packing is formed by the additional coating resin. A packing main portion overlapping the outside of the face plate portion provided with the layer, and a mounting piece portion extending in a folded shape from the packing main portion and overlapping the inside of the face plate portion. With their the packing main portion and the attachment piece portion is held above the packing within the faceplate portion in a form straddling above surface plate portion, is that.
[0006]
According to the present invention, since the packing is held on the face plate in a form in which the main part of the packing and the mounting piece straddle the face plate, the packing is used as a separate part during transportation or connection work. Instead, it can be handled together with the resin joint. Therefore, the trouble of carrying the packing together with the resin joint to the pipe construction site is eliminated, and at the same time, there is no room for a situation where the packing is displaced during the connection work of the resin joint. Further, the face plate portion extending to the end of the corrugated tube has an additional coating resin layer formed by extending the inner surface coating resin layer of the corrugated tube, and is provided outside such a face plate portion. Since the main part of the packing overlaps, and the mounting piece that extends in a folded manner from the main part of the packing overlaps inside the face plate part, between the end of the inner surface coating resin layer of the corrugated pipe and the packing at the connection point A situation in which a gap does not occur does not occur, and therefore, a situation in which the liquid flowing through the conduit contacts the metal surface of the corrugated tube and corrodes that portion does not occur.
[0007]
Another pipe resin joint according to the present invention is configured such that a tubular portion connected to an inner peripheral portion of a flange portion is joined to an end portion of a metal corrugated pipe having an inner surface coating resin layer, and attached to the tubular portion. In the piping resin joint in which the connected flange portion is abutted against the counterpart flange portion and both flange portions are pressed in a direction approaching each other, the flange portion faces the outer end surface of the connection flange portion. In addition, the connection flange portion is prevented from coming off, and the outer peripheral portion of the packing superimposed on the end surface of the flange portion is engaged with the outer peripheral portion of the flange portion to hold the packing on the flange portion. That is, the engagement pieces are integrally provided.
[0008]
According to the present invention, since the packing is integrated with the flange of the resin joint by the engagement piece engaged with the outer peripheral portion of the flange, the packing is provided as a separate part during transportation or connection work. Instead, it can be handled together with the resin joint. Therefore, the trouble of carrying the packing together with the resin joint to the pipe construction site is eliminated, and at the same time, there is no room for a situation where the packing is displaced during the connection work of the resin joint.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 4 show a resin joint for piping according to claim 1, FIG. 1 is a side view of a half cut, FIG. 2 is an enlarged sectional view of a portion II in FIG. 1, and FIG. 3 is a modified example of a portion II in FIG. It is the enlarged sectional view shown, and the enlarged sectional view which showed another modification of the II section of FIG.
[0010]
As shown in FIG. 1, the resin joint A includes a corrugated tube 1 having a corrugated tube wall having an inner surface coating resin layer 2 (see FIG. 2). One end and the other end of the corrugated tube 1 are provided with a straight tube portion 12 whose waveform is omitted, and the straight tube portion 12 is inserted into a center hole 31 of the connection flange portion 3 so that the connection flange portion 3 is formed. Is attached to the end of the corrugated tube 1. The corrugated tube 1 is made of a metal tube such as stainless steel that does not easily rust. In addition, the inner surface coating resin layer 2 is made of a synthetic material having excellent chemical resistance such as a fluororesin which is not easily attacked even when it comes into contact with a corrosive liquid such as an acid solution such as hydrochloric acid or sulfuric acid, an alkali solution or an organic solvent. Resin is used. This inner surface coating resin layer 2 is formed in a waveform overlapping the inner surface of the corrugated tube 1. The corrugated tube 1 is integrated with the inner surface coating resin layer 2 so as to exhibit a reasonable expansion and contraction action and a bending deformation action in response to a temperature change or the like.
[0011]
As shown in FIG. 2 in an enlarged manner, a face plate portion 13 extending along the outer end face 32 of the connection flange portion 3 through which the straight tube portion 12 is inserted extends into the straight tube portion 12 of the corrugated tube 1. ing. In the example of FIG. 2, the face plate portion 13 is divided into an inner side plate portion 14 and an outer side plate portion 15 that overlap in a folded shape, and the outer peripheral portions of the inner and outer face plate portions 14 and 15 are bent to form a bent portion 16. Is continuous through. In addition, an additional coating resin layer 21 formed by extending the inner coating resin layer 2 overlaps the entire face plate portion 13, that is, the inner and outer face plate portions 14, 15 and the bent portion 16. This additional coating resin layer 21 is formed of the same resin as the inner surface coating resin layer 2.
[0012]
5 is a packing. The packing 5 includes an annular packing main portion 51 and an annular mounting piece portion 52 extending outward from the inner peripheral portion of the packing main portion 51 so as to be folded outward. The packing piece 52 is sandwiched between the outer side plate part 14 and the outer side plate part 15, so that the packing 5 is attached to the face plate part 13 in such a manner that the packing main part 51 and the mounting piece part 52 straddle the inner side plate part 14. Is held. Further, an annular cushion material 53 made of leather, cardboard, or another material having cushioning properties is sandwiched between the outer face plate portions 15. The material of the packing 5 is formed of the same resin as that of the inner coating resin layer 2.
[0013]
The corrugated tube 1 having the inner coating resin layer 2 and the additional coating resin layer 21 is manufactured by, for example, the following process. That is, after lining or coating the inner surface coating resin layer 2 and the additional coating resin layer 21 on the inner surface of the metal straight pipe before being formed into a corrugated shape, the straight pipe is shown in FIG. 1 or FIG. In addition, the face plate portion 13 is formed into a chevron shape. After the mounting piece 52 of the packing 5 is sandwiched between the inner side plate 14 and the outer side plate 15 of the face plate 13, the inner side plate 14 and the outer side plate 15 of the face plate 13 are caulked. Then, the mounting piece 52 is firmly held between the face plates 14 and 15.
[0014]
When the above resin joint A for piping is connected to a pipe or another joint, its connection flange 3 abuts against a counterpart flange (not shown) provided on those pipes or another joint, and bolts, nuts, etc. The two fasteners are pressed in a direction approaching each other by the fastener of the above, and the two flanges are joined.
[0015]
According to this embodiment, since the packing 5 is held by the face plate portion 13 at the end of the corrugated tube 1, the packing 5 is not provided as a separate part when the resin joint A is transported or connected. Since it becomes possible to handle together with the joint A, the trouble of carrying the packing 5 as a separate part together with the resin joint A to the pipe construction site is eliminated. In addition, since the packing 5 is originally held by the face plate portion 13 of the corrugated pipe 1, there is no room for the packing 5 to be displaced during the connection work of the resin joint A, and the connection work is performed smoothly. Will be able to do it. The face plate portion 13 extended to the end of the corrugated tube 1 has an additional coating resin layer 21 formed by extending the inner coating resin layer 2 of the corrugated tube 1. The packing main portion 51 overlaps the outside of the face plate portion 13 via the cushion material 53, and the mounting piece portion 52 extending in a folded manner from the packing main portion 51 overlaps the inside of the face plate portion 13. A gap between the end of the inner surface coating resin layer 2 of the corrugated tube 1 and the packing 5 does not occur, and therefore, a situation where the portion is corroded does not occur.
[0016]
FIG. 3 shows a modified example. In this case, by omitting the cushion material 53 described in FIG. 2, the packing main part 51 of the packing 5 is directly overlapped with the outer face plate part 15 of the face plate part 13. is there. Other configurations are the same as those described with reference to FIG. 1 or FIG. Therefore, the same or corresponding parts are denoted by the same reference numerals, and duplication of description is avoided.
[0017]
FIG. 4 shows still another modification. In this case, one face plate portion 13 extends along the outer end face 32 of the connection flange portion 3 through which the straight tube portion 12 is inserted. The packing 5 includes a ring-shaped packing main portion 51 and a ring-shaped mounting piece portion 52 extending inwardly and folded from an outer peripheral portion of the packing main portion 51, and the face plate portion 13 and the connection flange portion 3 are provided. The packing 5 is held by the face plate 13 in a form in which the packing main part 51 and the mounting piece 52 straddle the face plate 13. An additional coating resin layer 21 formed by extending the inner surface coating resin layer 2 overlaps the entire face plate portion 13. This additional coating resin layer 21 is formed of the same resin as the inner surface coating resin layer 2. Other configurations are the same as those described with reference to FIG. 1 or FIG. Therefore, the same or corresponding parts are denoted by the same reference numerals, and duplication of description is avoided.
[0018]
The same operation as that described in the embodiment of FIG. 1 or FIG. 2 is also exerted by the cases described in FIG. 3 and FIG.
[0019]
According to the above embodiment, when the packing 5 is formed of the same resin as the inner surface coating resin layer 2, a fluororesin which is not easily attacked even when the outer surface plate portion 15 of the surface plate portion 13 comes into contact with a corrosive liquid. It can be held by the packing main portion 51 made of synthetic resin having excellent chemical resistance and the inner surface coating resin layer 2 at the end of the corrugated tube 1. It can reliably protect against corrosion due to contact.
[0020]
5 to 7 show a resin joint A for piping according to claim 2, FIG. 5 is a half cut side view, FIG. 6 is an enlarged sectional view of a VI portion in FIG. 5, and FIG. 7 is a modified example of a VI portion in FIG. It is the expanded sectional view which showed.
[0021]
As shown in FIG. 5, the resin joint A includes a corrugated tube 1 having a corrugated tube wall having an inner surface coating resin layer 2 (see FIG. 6), and one end and the other end of the corrugated tube 1. In addition, a tubular portion 61 continuously provided on the inner peripheral portion of the flange portion 6 is joined by welding, and the connecting flange portion 3 is attached to the tubular portion 61 in an outer fitting shape. The same material as that described in FIG. 1 and the like is used for the corrugated tube 1 and the inner surface coating resin layer 2. The flange 6 faces the outer end surface 32 of the connection flange 3 to prevent the connection flange 3 from coming off.
[0022]
The packing 5 is integrally provided with an engagement piece 55 formed in a short cylindrical shape on an outer peripheral portion thereof. The packing 5 is held by the flange 6 by fitting the engagement piece 55 into the outer peripheral portion of the flange 6 in a press-fit manner and engaging.
[0023]
Also in this resin joint A, the corrugated tube 1 having the inner surface coating resin layer 2 is formed by lining or coating the inner surface coating resin layer 2 on the inner surface of a metal straight pipe before being formed into a corrugation, and then using a molding machine. It is manufactured by shaping the straight pipe into the waveform shown in FIG.
[0024]
When this piping resin joint A is connected to a pipe or another joint, the connection flange 3 is brought into contact with a mating flange (not shown) provided in the pipe or another joint, and a bolt, a nut, etc. The two flange portions are pressed by the fastener in a direction approaching each other, and the two flange portions are joined.
[0025]
According to this embodiment, the packing 5 is engaged with the outer peripheral portion of the flange 6 via the engagement piece 55 and is held by the flange 6, so that the packing 5 is transported or connected during connection. It can be handled together with the resin joint A, not as a separate part. Therefore, the trouble of carrying the packing 5 together with the resin joint A to the pipe construction site is eliminated, and at the same time, there is no room for the situation where the packing 5 is displaced during the connection work of the resin joint A.
[0026]
FIG. 7 shows a modified example. In this case, the engaging piece 55 of the packing 5 described with reference to FIG. 6 has an annular bent portion 56 bent inward at an end thereof. When the engagement piece 55 is fitted to the outer periphery of the flange 6, the locking portion 56 engages with the back surface of the flange 6, so that the locking portion 56 and the packing 5 sandwich the flange 6. I have to attach it. According to this, there is an advantage that the packing 5 does not easily fall off from the flange 6. Other configurations are the same as those described with reference to FIG. 5 or FIG. 6, and the same or corresponding portions are denoted by the same reference characters to avoid redundant description. In the example shown in FIGS. 5 to 7, the ring-shaped ridge 57 is formed on the packing 5 so that the ridge 57 is brought into contact with the mating flange portion. Can be omitted if not necessary.
[0027]
【The invention's effect】
As described above, in the resin joint for piping according to the present invention, since the packing is originally held on the resin joint side, the trouble of transporting the packing as a separate part to the pipe construction site together with the resin joint is eliminated, In addition, the number of parts required for the piping is reduced, so that the cost of the piping can be easily reduced. In addition, there is no room for the packing to be displaced during the connection operation, and the connection workability is improved accordingly.
[Brief description of the drawings]
FIG. 1 is a half cut side view of a resin joint for piping according to an embodiment of the present invention.
FIG. 2 is an enlarged sectional view of a portion II in FIG.
FIG. 3 is an enlarged cross-sectional view showing a modification of the part II in FIG.
FIG. 4 is an enlarged cross-sectional view showing another modification of the portion II in FIG. 1;
FIG. 5 is a half cut side view of a resin joint for piping according to an embodiment of the present invention.
FIG. 6 is an enlarged sectional view of a portion VI in FIG. 5;
FIG. 7 is an enlarged sectional view showing a modification of the VI section in FIG. 5;
[Explanation of symbols]
A Resin joint for piping 1 Corrugated pipe 2 Inner surface coating resin layer 3 Connection flange portion 5 Packing 6 Flange portion 13 Face plate portion 21 Additional coating resin layer 31 Center hole 32 of connection flange portion Outer end surface 51 of connection flange portion 51 Packing main portion 52 Mounting Piece 55 engaging piece 61 cylinder

Claims (2)

A connection flange portion is attached to an end of a metal corrugated pipe having an inner surface coating resin layer, and the connection flange portion is abutted against a counterpart flange portion with packing therebetween, and both flange portions are pressed in a direction to approach each other. In a resin joint for piping that is joined in the
At the end of the corrugated tube inserted into the center hole of the connection flange, a face plate along the outer end surface of the connection flange is extended, and the inner surface coating resin layer is extended to the face plate. Formed by the additional coating resin layer of the same material as the inner surface coating resin layer,
The packing integrally has a packing main portion overlapping the outside of the face plate portion provided with the additional coating resin layer, and a mounting piece portion extending in a folded shape from the packing main portion and overlapping the inside of the face plate portion. A resin joint for piping, wherein the packing is held by the face plate in such a form that the main part of the packing and the mounting piece straddle the face plate. A tubular portion connected to the inner peripheral portion of the flange portion is joined to an end portion of a metal corrugated tube having an inner surface coating resin layer, and a connecting flange portion attached to the tubular portion projects from a mating flange portion. In a resin joint for piping joined together in a state where both flange portions are pressed together in a direction approaching each other,
The flange portion opposes the outer end surface of the connection flange portion to prevent the connection flange portion from coming off, and relates to the outer peripheral portion of the packing superimposed on the end surface of the flange portion and the outer peripheral portion of the flange portion. A resin joint for piping, in which engagement pieces for attaching and holding the packing to the flange are integrally connected.

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