JP7613991B2 - Piping connection device - Google Patents

Description

The present invention relates to a piping connection device.

Patent Document 1 discloses an electric fusion pipe joint. This electric fusion pipe joint comprises a pipe joint body made of thermoplastic resin, a heating wire, and an impedance element. The heating wire is provided inside or on the inner surface of the pipe joint body. The impedance element is connected to both ends of the heating wire.

Patent Document 2 discloses a joint part. This joint part includes two opposing flanges, a gasket, and a flange. Synthetic resin pipes are connected one-to-one to these two flanges. The gasket is sandwiched between the two flanges. The flange tightens the two flanges.

Patent Document 3 discloses a pipe connection device. This pipe connection device connects water supply and sewerage pipes, etc., that are installed in a building or the like. This pipe connection device includes a seal ring, a housing-type pipe joint, a locking ridge, and a fastening means. The seal ring seals the outer circumferential surfaces of the connection ends of the pipes to be connected to each other. The housing-type pipe joint is formed by dividing an annular body in the circumferential direction. The housing-type pipe joint is composed of a plurality of housings. The outer circumferential surface of the seal ring is sandwiched between the plurality of housings. The locking ridge protrudes in an annular shape from the outer circumferential surface of the connection end of the pipe. The locking ridge engages with the inner circumferential opening edge of the housing from the inside, thereby preventing the pipe from coming out of the housing. The fastening means presses the seal ring against the outer circumferential surface of the connection end of the pipe by fastening the ends of the housing.

Japanese Patent Application Publication No. 4-166325 CD-ROM of Japanese Utility Model Application No. 1-116068 (Japanese Utility Model Application Laid-Open No. 3-55986) JP 2020-16246 A

The electric fusion pipe joint disclosed in Patent Document 1 has problems in that the large amount of power required for fusion and the length of time required for curing after fusion can easily become a constraint on construction.

The joint disclosed in Patent Document 2 can solve the problems of the electric fusion pipe joint disclosed in Patent Document 1. However, the joint disclosed in Patent Document 2 has the problem that the sealing function of the gasket is easily deteriorated.

The pipe connection device disclosed in Patent Document 3 can solve the problems with the joints disclosed in Patent Document 2. However, the pipe connection device disclosed in Patent Document 3 has a problem in that when the material of the pipe is synthetic resin, the pipe expands and becomes easily deformed when hot water flows through the pipe, which may cause damage near the connection end of the pipe.

The object of the present invention is to provide a pipe connection device that reduces the risk of damage near the connection end of a synthetic resin pipe.

The pipe connection device of the present invention is explained based on the drawings. Note that the reference symbols used in this section are intended to aid in understanding the contents of the invention, and are not intended to limit the contents to the scope shown in the drawings.

In order to achieve the above-mentioned object, according to one aspect of the present invention, the pipe connection device 10 includes a seal ring 20, a plurality of housings 22, 22, and a fastening means 24. The seal ring 20 is for sealing the outer circumferential surface of the connection point. The connection point is any point between a pair of synthetic resin pipes 200, 200 to be connected to each other. The plurality of housings 22, 22 clamp the outer circumferential surface of the seal ring 20. The fastening means 24 presses the seal ring 20 against the connection point by fastening the ends of the plurality of housings 22, 22. The pipe connection device 10 further includes a protector 62. The protector 62 is arranged to cover a point 102 at any point next to the connection point where any of the plurality of housings 22, 22 may come into contact as the ends of the plurality of housings 22, 22 are fastened by the fastening means 24.

The protective body 62 is disposed at a location 102, which will be described below, among locations adjacent to the connection location. This location is a location where any of the multiple housings 22, 22 may come into contact as the ends of the multiple housings 22, 22 are tightened by the tightening means 24. The protective body 62 is disposed so as to cover this location 102. This reduces the risk that any of the multiple housings 22, 22 will destroy the vicinity of the connection end of the synthetic resin pipe 200, even if the synthetic resin pipe 200 expands and becomes easily deformed due to hot water flowing through it.

It is also preferable that the protective body 62 described above has an outer fitting tubular portion 80 and an annular protrusion 82. The annular protrusion 82 protrudes from the outer peripheral surface on the other side of a point 102 where any one of the multiple housings 22, 22 may come into contact, as viewed from the position of one end 100 of the outer fitting tubular portion 80 that faces the connection point. The annular protrusion 82 is integral with the outer fitting tubular portion 80.

The annular protrusion 82 protrudes from the outer circumferential surface of the outer tubular portion 80 on the other side of a point 102 where any of the multiple housings 22, 22 may come into contact as viewed from the position of one end 100 of the outer tubular portion 80 that faces the connection point. The annular protrusion 82 is integral with the outer tubular portion 80. As a result, even if any of the multiple housings 22, 22 come into contact with the outer tubular portion 80 as the multiple housings 22, 22 clamp the outer circumferential surface of the seal ring 20, the outer tubular portion 80 reinforced by the annular protrusion 82 is less likely to deform. As a result, the risk of damage near the connection end of the synthetic resin pipe 200 can be further reduced.

Alternatively, it is preferable that the annular protrusion 82 protrudes at a position closer to the one end 100 than the other end 104. The other end 104 is on the opposite side of the outer circumferential surface of the outer fitting tubular portion 80 to the one end 100. In this case, since the annular protrusion 82 is closer to the housing 22, even if any of the multiple housings 22, 22 contacts the outer fitting tubular portion 80, the outer fitting tubular portion 80 is less likely to deform. As a result, the risk of damage near the connection end of the synthetic resin pipe 200 can be further reduced.

Alternatively, it is preferable that the protective body 62 described above further has a second end protrusion 86. The second end protrusion 86 protrudes from the outer peripheral surface of the outer fitting tubular portion 80 on the side of the second end 104 as viewed from the position of the annular protrusion 82. The second end protrusion 86 is integral with the outer fitting tubular portion 80. In this case, even if the pipe connection device 10 is fixed between the annular protrusion 82 and the second end protrusion 86 with a known fastener, the outer fitting tubular portion 80 reinforced by the annular protrusion 82 and the second end protrusion 86 is unlikely to deform. As a result, the risk of the pipe connection device 10 itself being damaged when fixed can be reduced.

It is also preferable that the above-mentioned pipe connection device 10 further includes a fusion tubular body 60. The fusion tubular body 60 is arranged from the connection point to the adjacent portion of the connection point and across one of the pair of synthetic resin pipes 200, 200. The fusion tubular body 60 is intended to be fused to one end of the pair of synthetic resin pipes 200. In this case, it is preferable that the fusion tubular body 60 has a space forming portion 120, a tightly fitting annular portion 122, and an opposing surface forming portion 124. The space forming portion 120 forms a space that communicates with the inside of one of the pair of synthetic resin pipes 200, 200. The tightly fitting annular portion 122 protrudes from the end of the space forming portion 120 on the connection point side. The tightly fitting annular portion 122 is integral with the space forming portion 120. The seal ring 20 is directly in contact with the tightly fitting annular portion 122. The opposing surface forming portion 124 forms a surface that faces the contact ring portion 122 across the protector 62.

The tightly fitting annular portion 122 protrudes from the end of the space forming portion 120 on the connection side. The tightly fitting annular portion 122 is integral with the space forming portion 120. The seal ring 20 is directly attached to the tightly fitting annular portion 122. The opposing surface forming portion 124 forms a surface that faces the tightly fitting annular portion 122 with the protector 62 sandwiched between them. In this case, the protector 62 is sandwiched between the tightly fitting annular portion 122 and the opposing surface forming portion 124. This makes it difficult for the protector 62 to fall out of the fusion tubular body 60. As a result, the risk of the protector 62 being lost can be reduced.

Furthermore, a synthetic resin flow path is formed at a location 102 adjacent to the above-mentioned connection location where any of the multiple housings 22, 22 may come into contact . In this case, a gap 130 is formed between the location where the synthetic resin flow path is formed and the protector 62. In this case, when hot water flowing through the synthetic resin pipe 200 flows into the flow path and the flow path expands and becomes easily deformed, the risk of the protector 62 biting into the outer circumferential surface of the fusion tubular body 60 is reduced . As a result, the risk of damage to the vicinity of the connection end of the synthetic resin pipe 200 can be further reduced.

The present invention reduces the risk of damage near the connection end of the synthetic resin pipe.

1 is an overall view of a pipe connection device according to an embodiment of the present invention. 1 is a diagram showing an internal structure of a pipe connection device according to an embodiment of the present invention; FIG. 2 is a diagram showing the internal structure of a shimok according to an embodiment of the present invention. 1 is an overall view of a fusion tube according to an embodiment of the present invention; FIG. 1 is an overall view of a protective body according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the same parts are given the same reference numerals. Their names and functions are the same. Therefore, detailed descriptions thereof will not be repeated.

[Configuration of piping connection device]
Fig. 1 is an overall view of a pipe connection device 10 according to this embodiment. Fig. 2 is a view showing the internal structure of the pipe connection device 10 according to this embodiment. In Fig. 2, two synthetic resin pipes 200, 200 are connected to the pipe connection device 10 according to this embodiment. In Fig. 2, a part of the pipe connection device 10 is cut away. Hereinafter, the configuration of the pipe connection device 10 according to this embodiment will be described with reference to Figs. 1 and 2.

The pipe connection device 10 of this embodiment is used to connect a pair of synthetic resin pipes 200, 200. As is clear from FIG. 1, the pipe connection device 10 of this embodiment can be fixed by a U-bolt 250 or other well-known fastener. The pipe connection device 10 of this embodiment includes a seal ring 20, a pair of housings 22, 22, a pair of fastening means 24, and a pair of shims 26, 26.

The seal ring 20 is used to seal the connection point. In this embodiment, the connection point is where the pair of piping 26, 26 face each other and make contact. This allows the seal ring 20 to seal between the pair of synthetic resin pipes 200, 200 that are to be connected to each other.

The pair of housings 22, 22 is used to fix the seal ring 20. In this embodiment, the pair of housings 22, 22 clamps the outer peripheral surface of the seal ring 20. The configuration of the housing 22 is the same as that of a known one. Therefore, a detailed description thereof will not be repeated here.

The fastening means 24 presses the seal ring 20 against the connection point by tightening the ends of the housings 22, 22. In this embodiment, the fastening means 24 is realized by a well-known bolt and nut. Therefore, a detailed description thereof will not be repeated here.

The shimoku 26 is a member for connecting one end of a pair of synthetic resin pipes 200, 200 to the other end of the pair. The pair of shimoku 26, 26 is connected one-to-one to the pair of synthetic resin pipes 200, 200.

Figure 3 shows the internal structure of the shield 26 according to this embodiment. The configuration of the shield 26 according to this embodiment will be described below with reference to Figures 1 to 3. As is clear from Figure 3, the shield 26 according to this embodiment has a fusion tubular body 60 and a protective body 62.

The fusion tubular body 60 is for fusion to the end of the synthetic resin tube 200. In this embodiment, the tip of the synthetic resin tube 200 is inserted into the fusion tubular body 60. In this state, the outer peripheral surface of the tip of the synthetic resin tube 200 is fused to the inner peripheral surface of the fusion tubular body 60. As a result, one of the fusion tubular bodies 60 of the shimoku 26 is arranged from the connection point to the adjacent connection point and across one of the pair of synthetic resin tubes 200, 200. In addition, the fusion tubular body 60 forms a flow path through which hot water or other fluids flow inside the synthetic resin tube 200. In addition, the flow path is arranged at a location (in the case of this embodiment, the expected contact location 102 described later) where any of the locations (in the case of this embodiment, the inner peripheral opening edge 170 shown in FIG. 2) of the multiple housings 22, 22 may come into contact, among any of the locations adjacent to the connection point. The other fusion tubular body 60 of the shimoku 26 is arranged from the connection point, passing next to the connection point, to the other of the pair of synthetic resin tubes 200, 200. In this embodiment, the material of the fusion tubular body 60 is the same as the material of the synthetic resin tube 200. As a result, the material of the fusion tubular body 60 is a synthetic resin that can be fused to the end of the synthetic resin tube 200. As a result, the fusion tubular body 60 forms a flow path made of synthetic resin.

The protective body 62 is fitted around the outer circumference of the fusion tubular body 60. The protective body 62 is positioned so as to cover the assumed contact points 102 of the fusion tubular body 60, which will be described later. In this embodiment, the material of the protective body 62 is metal.

As is clear from FIG. 3, a gap 130 is formed between the protective body 62 and the portion of the outer circumferential surface of the fusion tube 60 where the protective body 62 is disposed.

Figure 4 is an overall view of the fusion tubular body 60 according to this embodiment. In Figure 4, a portion of the fusion tubular body 60 is cut away. Below, the configuration of the fusion tubular body 60 according to this embodiment will be described based on Figure 4. In this embodiment, the fusion tubular body 60 has a space forming portion 120, a close contact annular portion 122, an opposing surface forming portion 124, and a tube end housing portion 126.

The space forming part 120 forms a cylindrical space that communicates with the inside of the synthetic resin pipe 200. In this embodiment, the diameter of the space formed by the space forming part 120 is the same as the inner diameter of the synthetic resin pipe 200.

The tightly fitting annular portion 122 protrudes from the end of the space forming portion 120 on the connection side. In this embodiment, the tightly fitting annular portion 122 is integral with the space forming portion 120. In this embodiment, the seal ring 20 is directly in contact with the tightly fitting annular portion 122. The seal ring 20 is in contact with the outer circumferential surface of the pair of fusion tubes 60, 60, which are in contact with each other. This seals the connection portion described above.

The opposing surface forming portion 124 forms a surface that faces the tightly fitting annular portion 122, sandwiching the protective body 62. As a result, the protective body 62 is sandwiched between the tightly fitting annular portion 122 and the surface that faces it.

The tube end housing 126 forms a space in which the synthetic resin tube 200 is housed. In this embodiment, the diameter of the space formed by the tube end housing 126 is smaller than the outer diameter of the synthetic resin tube 200. This is because the outer peripheral surface of the tip of the synthetic resin tube 200 is melted in advance when the tip of the synthetic resin tube 200 is inserted into the fusion tubular body 60 of the shimoku 26. Therefore, the outer diameter of the synthetic resin tube 200 is larger than the diameter of the space formed by the tube end housing 126 by the thickness of the layer that is expected to melt.

Figure 5 is an overall view of the protective body 62 according to this embodiment. In Figure 5, a portion of the protective body 62 is cut away. Below, the configuration of the protective body 62 according to this embodiment will be described based on Figure 5. In this embodiment, the protective body 62 has an outer fitting cylindrical portion 80, an annular protruding portion 82, a one end side protruding portion 84, and an other end side protruding portion 86.

The outer fitting tubular portion 80 is a tubular portion that serves as the base of the annular protrusion 82. The end of the outer fitting tubular portion 80 that faces the connection point is the first end 100. The following location on the outer circumferential surface of the outer fitting tubular portion 80 is the expected contact location 102. This location is a location where any location of the multiple housings 22, 22 (in the case of this embodiment, the inner circumferential opening edge 170 shown in Figure 2) may come into contact. The end of the outer fitting tubular portion 80 opposite the first end 100 is the other end 104.

The annular protrusion 82 protrudes from the outer peripheral surface of the outer fitting tubular portion 80 on the other side of the assumed contact point 102 when viewed from the position of the one end 100. In the present embodiment, the annular protrusion 82 protrudes from the outer peripheral surface of the outer fitting tubular portion 80 at a position adjacent to the inner peripheral opening edge 170 of the housing 22. As a result, the position of the annular protrusion 82 is closer to the one end 100 than to the other end 104. In the present embodiment, the shape of the annular protrusion 82 is annular.

The one-end protrusion 84 protrudes from the one end 100 of the outer circumferential surface of the outer fitting tubular portion 80. In this embodiment, the one-end protrusion 84 is also annular in shape.

The other end protrusion 86 protrudes from the other end 104 of the outer circumferential surface of the outer fitting tubular portion 80. As a result, the other end protrusion 86 protrudes from a position on the other end 104 side as viewed from the position of the annular protrusion 82. In this embodiment, the shape of the other end protrusion 86 is also annular.

[Manufacturing method of pipe connection device]
The manufacturing method of the pipe connection device 10 according to the present embodiment is as follows. First, the manufacturer manufactures the seal ring 20, the pair of housings 22, 22, the fastening means 24, and the protective body 62 by a known method. After these are manufactured, the manufacturer places the protective body 62 in a mold (not shown). This mold is a mold for manufacturing the fusion tubular body 60. After the protective body 62 is placed in the mold, the manufacturer injects synthetic resin into the mold. When the injected synthetic resin solidifies, the manufacturer removes the die 26 from the mold. That is, the die 26 according to the present embodiment is manufactured by insert molding. A more specific procedure for the insert molding is known. Therefore, the detailed description thereof will not be repeated. After the pair of die 26, 26 is manufactured, the manufacturer assembles the seal ring 20, the pair of housings 22, 22, the fastening means 24, and the pair of die 26, 26. This completes the pipe connection device 10 according to the present embodiment.

[How to use the piping connection device]
The method of using the pipe connection device 10 according to this embodiment is as follows. In advance, the worker connects one of the pair of synthetic resin pipes 200, 200 to the fusion tubular body 60 of one of the pair of the shimoku 26, 26, and also connects the other of the pair of the synthetic resin pipes 200, 200 to the fusion tubular body 60 of the other of the pair of the shimoku 26, 26. To this end, the worker first melts the outer circumferential surface of the tip of the synthetic resin pipe 200 by a known method, and then inserts the tip of the synthetic resin pipe 200 into the fusion tubular body 60 of the shimoku 26. The molten outer circumferential surface of the tip of the synthetic resin pipe 200 solidifies, and the synthetic resin pipe 200 and the fusion tubular body 60 are fused together. Next, the worker butts the fusion tubular bodies 60 of the pair of the shimoku 26, 26 together, and brings the seal ring 20 into close contact with the outer circumferential surfaces of the close contact annular portions 122 of the pair of the shimoku 26, 26. Once the seal ring 20 is in close contact, the worker places the pair of housings 22, 22 over the seal ring 20. Once the pair of housings 22, 22 are placed over the seal ring 20, the worker tightens the ends of the housings 22, 22 with the tightening means 24. In this way, the pair of synthetic resin pipes 200, 200 are connected to each other by the piping connection device 10 according to this embodiment.

[Explanation of Effects According to the Present Embodiment]
As described above, in the pipe connection device 10 according to this embodiment, the protector 62 is fitted to the assumed contact location 102 on the outer circumferential surface of the fusion tubular body 60. The protector 62 is fitted so as to cover the assumed contact location 102. This reduces the risk that any of the multiple housings 22, 22 will destroy the fusion tubular body 60 even if the fusion tubular body 60 expands and becomes easily deformed due to the flow of hot water inside the fusion tubular body 60.

In the case of the pipe connection device 10 according to this embodiment, the annular protrusion 82 protrudes from the outer peripheral surface of the outer fitting tubular portion 80 on the other side of the expected contact point 102. The annular protrusion 82 is integral with the outer fitting tubular portion 80. As a result, even if any of the multiple housings 22, 22 contact the outer fitting tubular portion 80 as the multiple housings 22, 22 clamp the outer peripheral surface of the seal ring 20, the outer fitting tubular portion 80 reinforced by the annular protrusion 82 is less likely to deform. As a result, the risk of damage to the fusion tubular body 60 is further reduced.

In addition, in the case of the pipe connection device 10 according to this embodiment, the annular protrusion 82 is closer to the housing 22, so that even if any of the multiple housings 22, 22 come into contact with the outer fitting tubular portion 80, the outer fitting tubular portion 80 is less likely to deform. As a result, the risk of damage to the fusion tubular body 60 is further reduced.

Moreover, in the case of the pipe connection device 10 according to this embodiment, even if the pipe connection device 10 is fixed between the annular protrusion 82 and the other end protrusion 86 using a known fastener, the outer fitting tubular portion 80 reinforced by the annular protrusion 82 and the other end protrusion 86 is unlikely to deform. As a result, the risk of the pipe connection device 10 itself being damaged when fixed is reduced.

In addition, in the case of the pipe connection device 10 according to this embodiment, the fusion tubular body 60 can be connected to the synthetic resin pipe 200 in advance. As a result, the possibility that connecting the fusion tubular body 60 to the synthetic resin pipe 200 becomes a constraint on construction is reduced.

Moreover, in the case of the pipe connection device 10 according to this embodiment, the protective body 62 is sandwiched between the close-fitting annular portion 122 and the opposing surface forming portion 124. This makes it difficult for the protective body 62 to fall out of the fusion tubular body 60. As a result, the risk of losing the protective body 62 is reduced.

[Modification]
The embodiments disclosed herein are illustrative in all respects. The scope of the present invention is not limited to the above-described embodiments. Of course, various design modifications can be made to the above-described embodiments without departing from the spirit of the present invention.

For example , the fusion cylinder 60 does not necessarily have to be formed with the opposing surface forming portion 124 .

The specific locations sealed by the seal ring 20 are not limited to those described above. The locations may be any location between the pair of synthetic resin pipes 200, 200 to be connected to each other. Therefore, the ends of the pair of synthetic resin pipes 200, 200 may be directly sealed by the seal ring 20. In this case, the pair of protective bodies 62, 62 are fitted one-to-one to the pair of synthetic resin pipes 200, 200.

10...Pipe connection device 20...Seal ring 22...Housing 24...Tightening means 26...Bottom 60...Fusing cylindrical body 62...Protective body 80...Externally fitted cylindrical portion 82...Annular protrusion 84...One end side protrusion 86...Other end side protrusion 100...One end portion 102...Expected contact location 104...Other end portion 120...Space forming portion 122...Closely fitted annular portion 124...Opposing surface forming portion 126...Pipe end accommodating portion 130...Gap 170...Inner circumference side opening edge 200...Synthetic resin pipe 250...U-bolt

Claims (5)

a seal ring for sealing an outer circumferential surface of a connection portion between a pair of synthetic resin pipes to be connected to each other;
a plurality of housings that sandwich an outer circumferential surface of the seal ring;
A pipe connection device including a fastening means for fastening ends of the housings together to press the seal ring against the connection portion,
a protective body arranged to cover a portion of the connection portion adjacent to the connection portion where any of the housings may come into contact with each other as the ends of the housings are fastened by the fastening means ;
a flow path made of a synthetic resin is formed at a location adjacent to the connection location where any of the plurality of housings may come into contact;
The pipe connection device according to claim 1, wherein a gap is formed between the protective body and the location where the synthetic resin flow path is formed . The protector is
An outer fitting cylindrical portion;
The piping connection device as described in claim 1, characterized in that it has an annular protrusion that protrudes from the outer peripheral surface on the other side of the point at which any of the multiple housings may contact, as viewed from the position of one end of the outer fitting cylindrical portion facing the connection point, and is integral with the outer fitting cylindrical portion. The piping connection device according to claim 2, characterized in that the annular protrusion protrudes from the outer circumferential surface of the outer fitting cylindrical part at a position closer to the one end than the other end opposite the one end. The piping connection device according to claim 2, characterized in that the protective body further has an other end side protrusion that protrudes from the outer peripheral surface of the outer fitting cylindrical part on the other end side as viewed from the position of the annular protrusion and is integral with the outer fitting cylindrical part. the pipe connection device further includes a fusion tubular body arranged across one end of the pair of synthetic resin pipes from the connection point through the adjacent portion of the connection point and to be fused to the one end of the pair of synthetic resin pipes,
The fusion tube is
a space forming portion that forms a space communicating with the inside of the one of the pair of synthetic resin pipes;
a contact annular portion that protrudes from an end of the outer periphery of the space forming portion on the connection portion side, is integral with the space forming portion, and is directly contacted with the seal ring;
2. The pipe connection device according to claim 1, further comprising an opposing surface forming portion that forms a surface opposing the contact annular portion with the protector interposed therebetween.

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