JP6409087B2 - Multiple pipe fittings - Google Patents

Description

  The present invention relates to a multiple pipe joint, and more particularly to a multiple pipe joint used for connecting multiple pipes such as a double pipe having an inner pipe and an outer pipe.

  When transferring sewage discharged from a factory or the like to a sewage treatment facility, a piping facility is installed for transporting the sewage (fluid) through the piping. Here, in order to prevent accidents where sewage leaks in the middle of pipes or at connecting points where pipes are connected to each other and flows into the factory, for example, a pair of inner pipes and outer pipes arranged concentrically. Pipes with a tube structure may be used. As a result, the sewage is transported through the inner pipe, and the outer pipe functions as a protective pipe that prevents the outflow, so that even if a part of the inner pipe is damaged, it is interposed between the inner pipe and the outer pipe. It is possible to prevent the sewage from flowing into the factory in the provided space. In particular, in recent years, the enforcement of the revised Water Pollution Control Law may obligate the installation of piping equipment that complies with laws and regulations using pipes with a double pipe structure, and the number of cases where such piping equipment is installed has increased. ing. Similarly, when transporting highly dangerous substances such as chemicals and high-pressure gas to a desired location in the factory as a fluid, piping equipment using the above-mentioned double pipe may be installed as well. . Furthermore, in recent years, a pipe structure using such a double pipe is often used for sound insulation and heat insulation, and the demand is increasing. Further, when a plurality of fluids of different types are transported, piping equipment using a multiple tube having a plurality of inner tubes may be installed in the outer tube.

  When installing piping equipment in a factory, L-shaped pipe joints (so-called “elbows”) used to connect straight double pipes and change the direction of fluid transport, Various shapes of pipe joints are used, such as T-shaped pipe joints (so-called “cheese”) or Y-shaped pipe joints used for branching in the direction. For this reason, when a pipe having a double pipe structure is used, these pipe joints also need to have a double structure. Conventionally, a pipe joint having a double pipe structure (double pipe joint) is often configured by combining two types of existing pipe joints having different pipe diameters. For example, a pipe joint for inner pipe connection (inner pipe joint part) that connects with an inner pipe of a double pipe is included in a pipe joint for outer pipe connection (outer pipe joint part) that connects with an outer pipe of a double pipe. A double pipe joint that can be connected to the double pipe is configured by inserting and fixing the space between the inner pipe joint part and the outer pipe joint part as appropriate.

  Here, since the inner pipe and the outer pipe connected to the double pipe joint occupy most of the component ratio of the piping equipment, they greatly affect the size and weight of the entire piping equipment. In the case of the above double pipe joint, the inner pipe joint part is inserted into the outer pipe joint part, so it is necessary to increase the pipe diameter of the outer pipe joint part and the outer pipe connected to the double pipe joint. Even larger than necessary. As a result, the size of the entire piping facility may increase and the weight may increase. In particular, when a complex-shaped double pipe joint such as cheese is configured, such a tendency is strong. That is, out of the piping equipment installed in the factory, the outer pipe connected to the double pipe joint has a larger diameter than necessary, so the whole piping equipment tends to be enlarged, and the installation location is restricted. There was a problem. This problem is more conspicuous when connecting multiple tubes configured to accommodate a large number of inner tubes in the outer tube.

  Therefore, in view of the above circumstances, the present invention reduces the diameter of the outer pipe joint part by integrally molding and suppresses the diameter of the outer pipe connected to the outer pipe joint part, and uses the multiple pipe joint and the same. The second is to provide multiple pipe joints that can make the entire piping facility compact and lightweight, and to provide multiple pipe joints that can improve work efficiency when constructing piping equipment. It is set as an issue.

In order to solve the above-mentioned problem, the multiple pipe joint of the present invention is a multiple pipe joint for connecting a multiple pipe having one or a plurality of inner pipes and an outer pipe accommodating the inner pipe in the pipe, and one or more inner fitting portion are connected by bonding respectively the inner tube, and the outer fitting portion connected to the outer tube, accommodated the inner pipe joint in the tube of the outer fitting portion And the inner pipe joint part, the outer pipe joint part, and the joint support part are integrally formed of resin, and the stopper part of the inner pipe joint part and the outer joint part are provided. The stopper part of the pipe joint part is provided on the same plane, and the opening end of the inner pipe joint part protrudes outward from the opening end of the outer pipe joint part. In addition to the above-described configuration, the multiple pipe joint of the present invention is “the multiple pipe joint is formed in an L shape or a T shape, and the joint support portion is the inner pipe joint portion. Between the upper outer surface of the inner pipe joint portion and the upper inner surface of the outer pipe joint portion, the lower outer surface of the inner pipe joint portion, and the outer pipe joint portion. Between the inner surface of the lower portion and between the outer surface of the curved outer portion of the L-shaped inner pipe joint portion and the inner surface of the curved outer portion of the L-shaped outer pipe joint portion, or T What is the outer surface of the outer side opposite to the open end of the T-shaped vertical line part of the T-shaped inner pipe joint part and the open end of the T-shaped vertical line part of the T-shaped outer pipe joint part? It is provided in at least three portions between the inner surface of the outer portion on the opposite side.

  The multiple pipe joint is for connecting a “multiple pipe” such as the above-mentioned double pipe or a pipe having two or more inner pipes to the outer pipe. Here, among the multiple tubes, for example, a pair of inner tubes and outer tubes arranged concentrically, a tube arranged at a position where the inner tube is eccentric with respect to the outer tube (double tube), Or the thing etc. which arranged the some inner pipe in parallel in the outer pipe | tube are mentioned. The “outer tube” in the multiple tube functions as a protective tube that prevents the fluid from flowing out. In addition, the outer tube may have a function of sound insulation or heat insulation. For the multiple pipe joint, the diameter, number, and arrangement of the inner pipe joint part and the outer pipe joint part are determined in accordance with the diameters and arrangements of the inner pipe and the outer pipe of the multiple pipe to be connected. .

  Here, the inner pipe joint portion has an open end at both ends, and the inner pipe is connected to the open end, whereby a pair of inner pipes can be coupled. The inner pipe to be connected is restricted from being further inserted by a stopper portion (corresponding to a contact end face with the inner pipe) formed in the inner pipe joint portion. At this time, it is inserted with the inner diameter of the inner pipe joint and the outer diameter of the inner pipe being in contact with each other, or inserted with the outer diameter of the inner pipe joint and the inner diameter of the inner pipe being in contact with each other. However, it does not matter. Further, the stopper portion is formed in a state in which the inner space of the inner pipe joint portion is reduced in diameter relative to the inner diameter of the inner pipe joint portion, or is formed in a state in which a part of the inner diameter is expanded relative to the outer diameter of the inner pipe joint portion. Any of these may be used, and function as a receiving port or an insertion port, respectively. Thereby, fluids, such as sewage conveyed through one inner pipe, can be conveyed to the other connected inner pipe through the inner space of the inner pipe joint. At this time, according to the shape of the inner pipe joint portion, the fluid conveyance direction can be changed in the orthogonal direction, or the fluid can be branched in two directions. On the other hand, the outer pipe joint portion has a larger diameter than the inner pipe joint portion, accommodates the inner pipe joint portion in the pipe, and has a substantially similar shape to the inner pipe joint portion. Thereby, an outer pipe joint part functions as a protective pipe like the outer pipe of a multiple pipe. Similarly to the inner pipe joint part, the outer pipe connected to the outer pipe joint part is further increased by a stopper part (corresponding to the contact end surface with the outer pipe) formed inside or outside the outer pipe joint part. Insertion is regulated. At this time, it is inserted with the inner diameter of the outer pipe joint part and the outer diameter of the outer pipe in contact with each other, or inserted with the outer diameter of the outer pipe joint part and the inner diameter of the outer pipe in contact with each other. However, it does not matter. Furthermore, the stopper portion is formed in a state where the inner space of the pipe is reduced with respect to the inner diameter of the outer pipe joint portion, or is formed in a state where a part of the outer diameter is expanded with respect to the outer diameter of the outer pipe joint portion. Any of these may be used, and each function as a receiving port or an insertion port.

  The joint support part is between the outer wall of the inner pipe joint part and the inner wall of the outer pipe joint part, or when there are a plurality of inner pipe joint parts, the outer wall of one inner pipe joint part and the inner wall of the other inner pipe joint part. Or by connecting between outer walls, it supports in the state which accommodated the one or some inner pipe joint part in the pipe | tube of an outer pipe joint part, and is comprised by the rib-shaped member etc. The inner pipe joint portion, the outer pipe joint portion, and the joint support portion are integrally formed using a resin by, for example, injection molding. The resin used as a raw material for the multiple pipe joint is appropriately determined according to other conditions such as chemical resistance and strength depending on the type of sewage to be conveyed or the properties of the fluid such as chemicals. Vinyl resin can be used. Furthermore, the joint support part is provided in the back (corresponding to the direction from the opening end of the inner pipe joint part toward the pipe inner space) from the stopper part of the inner pipe joint part.

  Therefore, according to the multiple pipe joint of the present invention, the inner pipe joint part and the outer pipe joint part connected to the inner pipe and the outer pipe of the multiple pipe, respectively, and the joint that connects and supports the inner pipe joint part and the outer pipe joint part. The support part is integrally formed of resin. Thereby, the manufacture of a multiple pipe joint can be facilitated compared with the conventional case where a multiple pipe joint is configured by combining two types of pipe joints. In addition, since it is not necessary to insert the inner pipe joint portion into the pipe of the outer pipe joint portion, the inner diameter of the outer pipe joint portion can be minimized. As a result, the multiple pipe joint can be made compact and lightweight. Furthermore, since the diameter of the outer pipe connected to the multiple pipe joint can be reduced, the entire piping facility can be reduced in size and weight in the same manner.

  By the way, the joint support part which connects an inner pipe joint part and an outer pipe joint part may be provided in the back position of the stopper part of an inner pipe joint part. Thereby, it is possible to reduce the influence of so-called “sink” that occurs when the multi-pipe joint is integrally molded using resin, and it is possible to prevent deformation near the opening end of the inner pipe joint. As a result, the connection of the inner pipe and the inner pipe joint can be ensured at the mouth. More specifically, “sink” is cooled in a mold when a product (here, a multi-pipe joint) is manufactured by injecting a high-temperature molten resin into the mold in injection molding or the like. This is due to the fact that the product shrinks and differs from the designed shape. Such sink marks vary depending on the shape and thickness of the product. The stopper part of the inner pipe joint part is connected to the inner pipe of the multiple pipe, and in order to restrict further insertion, the inner pipe joint part of the inner pipe joint part having a circular shape in cross section, for example, is matched to the pipe shape of the inner pipe. In many cases, it is formed according to the shape, and when the joint support part is provided in the stopper part, the perfect circular shape of the cross section of the inner pipe joint part connected to the vicinity of the stopper part and the open end is deformed due to the difference in shrinkage with the surroundings. There are things to do. Then, the deformation | transformation which concerns can be prevented by providing a joint support part in the back position rather than a stopper part.

  Further, according to the multiple pipe joint of the present invention, the stopper parts of the inner pipe joint part and the outer pipe joint part are provided on the same surface. Thereby, each length of the straight pipe connected with a multiple pipe joint can be made to correspond. As a result, the outer pipe and the inner pipe can be cut at the same length at the work site where the piping equipment is installed, and workability can be improved.

  As an effect of the present invention, the multiple pipe joint is integrally molded to reduce the diameter of the outer pipe joint part, and the diameter of the outer pipe connected to the outer pipe joint part is kept small, and the multiple pipe joint and the same are used. The entire piping facility can be made compact and lightweight. Furthermore, the work efficiency at the time of constructing the piping equipment can be improved.

It is the (a) perspective view of the double pipe joint of 1st embodiment, and the perspective view of the inner pipe joint part and joint support part which abbreviate | omitted illustration of the (b) outer pipe joint part. It is sectional drawing cut | disconnected in the horizontal direction of the double pipe coupling of 1st embodiment, and (b) It is a front view. It is (a) perspective view of the double pipe joint of 2nd embodiment which is one Embodiment of this invention, and (b) The perspective view of the inner pipe joint part and joint support part which abbreviate | omitted illustration of the outer pipe joint part. . It is sectional drawing cut | disconnected in the horizontal direction of the double pipe coupling of embodiment of 2nd embodiment, and (b) It is a front view. It is the (a) perspective view of the double pipe joint of another example, and the perspective view of the inner pipe joint part and joint support part which abbreviate | omitted illustration of the (b) outer pipe joint part. It is sectional drawing cut | disconnected in the horizontal direction of the double pipe coupling of FIG. 5, and (b) It is a front view. It is the (a) perspective view of the double pipe joint of another example of this invention, and the perspective view of the inner pipe joint part and joint support part which abbreviate | omitted illustration of the (b) outer pipe joint part. It is sectional drawing cut | disconnected in the horizontal direction of the double pipe coupling of FIG. 7, and (b) front view.

  Hereinafter, the double pipe joint 1 (not corresponding to the multiple pipe joint of the present invention) of the first embodiment will be described based on FIG. 1 and FIG. Here, the double pipe joint 1 of the first embodiment is a so-called “elbow” that has a substantially L-shaped shape as a whole, and is a double pipe (pipe) composed of two types of straight pipes having different pipe diameters. ) And changing the transport direction of the fluid flowing through the inner pipe in the orthogonal direction to form part of the piping parts used to construct the piping equipment. Here, the double pipe is configured by inserting a straight pipe (inner pipe) having a small diameter into a straight pipe (outer pipe) having a large diameter, and is constructed at a site where piping equipment is installed. 2 (a) and 4 (a) are sectional views in plan view of the double pipe joints 1 and 20 cut in the horizontal direction. Here, for convenience, in FIGS. 2 (b) and 4 (b), the vertical direction of the paper is defined as the top and bottom of the double pipe joints 1 and 20, and the direction from the front of the paper to the depth of the paper is shown in FIGS. It is defined as the horizontal direction of the double pipe joints 1 and 20 in FIG. 2B and 4B are defined as the outer direction of the double pipe joints 1 and 20, and the right direction of the paper is defined as the inner direction of the double pipe joints 1 and 20, respectively. Although it does, it is unrelated to the direction at the time of use of the double pipe joint 1 (the same applies to FIGS. 6 and 8).

  The double pipe joint 1 of the first embodiment includes a substantially L-shaped inner pipe joint portion 2 connected to the inner pipe of the double pipe and a substantially L-shaped outer joint connected to the outer pipe of the double pipe. The pipe joint part 3 and the joint support part 4 which supports the inner pipe joint part 2 in the state accommodated in the pipe inner space 8 of the outer pipe joint part 3 are provided. Here, the inner pipe joint part 2, the outer pipe joint part 3, and the joint support part 4 are integrally molded by injection molding polyvinyl chloride resin into a mold.

  More specifically, the inner pipe joint portion 2 exhibits an appearance in which a pair of cylindrical members are combined in an orthogonal direction (see FIG. 1B). Open end 2a, 2b is located on the surface which mutually orthogonally crosses, and the pipe | tube interior space 5 curved in circular arc shape from one open end 2a to the other open end 2b is formed inside (refer Fig.2 (a)). . Here, each of the open ends 2a and 2b of the inner pipe joint portion 2 has a perfect circular cross section (see FIG. 2B) and has an inner diameter that substantially matches the outer diameter of the inner pipe of the double pipe to be connected. doing. Further, the inner side of the inner space 5 is formed with a diameter slightly smaller than the diameters of the opening ends 2a and 2b. Thereby, the end surface of the inner pipe (not shown) connected to the inner pipe joint portion 2 comes into contact with the reduced diameter portion (stopper portion 2f), and further insertion is restricted. As a result, the inner pipe of the double pipe can be fitted and connected to each of the open ends 2a and 2b of the inner pipe joint portion 2 with the amount of insertion being constant.

  On the other hand, the outer pipe joint part 3 includes a pair of cylindrical enlarged diameter parts 7 and an outer pipe joint part main body 6 having a smaller diameter than the enlarged diameter part 7 connecting between the enlarged diameter parts 7, respectively. The open end of the expanded diameter portion 7, that is, the open ends 3 a and 3 b of the outer pipe joint portion 3, are located on surfaces orthogonal to each other, and are curved in an arc shape from one open end 3 a to the other open end 3 b A space 8 is formed inside (see FIG. 2A). Here, each of the open ends 3a and 3b of the outer pipe joint portion 3 has a perfect circular cross section (see FIG. 2B) and has an inner diameter that substantially matches the outer diameter of the outer pipe of the double pipe to be connected. doing. Furthermore, the inner side of the pipe inner space 8 is formed with a diameter slightly smaller than the diameters of the open ends 3a and 3b, as in the case of the inner pipe joint portion 2 described above. Thereby, the end surface of the outer pipe (not shown) connected to the outer pipe joint portion 3 comes into contact with the reduced diameter portion (stopper portion 3g), and further insertion is restricted. Thereby, the outer pipe of the double pipe can be fitted and connected to each of the open ends 3a and 3b of the outer pipe joint portion 3 with the amount of insertion fixed.

  Further, as shown in FIG. 2 (a), the stopper portion 2f of the inner pipe joint portion 2 is located on a different surface from the stopper portion 3g of the outer pipe joint portion 3, and the joint support portion 4 is formed of the inner pipe joint. It is provided at a position behind the stopper portion 2 f of the portion 2. Further, in the double pipe joint 1 of the first embodiment, the sizes of the inner pipe joint part 2 and the outer pipe joint part 3 are respectively set to the same sizes as those standardized by JIS as pipe joints. Yes.

  By adopting the above configuration, the inner pipe and the outer pipe of the double pipe can be fitted and connected to the inner pipe joint portion 2 and the outer pipe joint portion 3, respectively. As a result, the double pipe and the double pipe joint 1 are connected, and the conveying direction of the fluid (for example, sewage) flowing through the inner pipe of the double pipe is changed in the orthogonal direction by the L-shaped double pipe joint 1. be able to. In addition, in order to prevent the fluid from leaking out, the connecting part of the inner pipe and the inner pipe joint part 2 or the connecting part of the outer pipe and the outer pipe joint part 3 uses a watertight or highly airtight adhesive. And firmly adhere.

  On the other hand, the joint support part 4 is for supporting the inner pipe joint part 2 having the above-described configuration in a state where the inner pipe joint part 2 is accommodated in the pipe inner space 8 of the outer pipe joint part 3, and the inner pipe joint part 2 and the outer pipe joint part. 3 is connected to the upper outer surface 2c of the inner pipe joint part 2 and the upper inner surface 3c of the outer pipe joint part 3 by connecting the inner pipe joint part 2 to the outer pipe joint part 3 An upper support portion 9 that is supported by the upper support portion 9, and a lower support portion 10 that is formed in the same shape as the upper support portion 9 and connects the lower outer surface 2 d of the inner pipe joint portion 2 and the lower inner surface 3 d of the outer pipe joint portion 3; A substantially fan-shaped flat plate-like outer portion support portion 11 that connects between the outer portion outer surface 2e of the inner pipe joint portion 2 and the outer portion inner surface 3e of the outer tube joint portion 3, and a pipe inner space 8 of the outer pipe joint portion 3 The inner pipe joint portion is closed in an oblique direction at the center of the curved shape (in the direction of 45 ° with respect to each of the opening ends 3a and 3b, see FIG. 2A) And comprising a substantially disc-shaped disc support 12 which is inserted. Here, the upper support portion 9, the lower support portion 10, and the outer support portion 11 are projected from the outer surfaces 2c, 2d, and 2e of the inner pipe joint portion 2 at intervals of 90 ° in front view (FIG. 2 (b)).

  Since the double pipe joint 1 of the first embodiment adopting the above configuration is integrally formed by injection molding a polyvinyl chloride resin into a mold, it is configured by combining two types of pipe joints having different diameters. Manufacture is easy compared to double pipe joints. Furthermore, since it is not necessary to insert the inner pipe joint portion into the pipe inner space of the outer pipe joint portion, the diameter of the outer pipe joint portion 3 is considerably increased with respect to the inner pipe joint portion 2 for the convenience of the combination work. Compared with the conventional case where it is necessary, the overall size of the double pipe joint 1 can be made compact, the diameter of the outer pipe connected to the outer pipe joint portion can be reduced, and the weight can be reduced. As a result, when installing piping equipment in a factory, it does not occupy a lot of space required for installation, and can be installed even in places where it was difficult to install. Moreover, the weight of the entire piping facility can be reduced, and the installation work itself can be facilitated. Moreover, since the operation | work which inserts an inner pipe joint in an outer pipe joint is not required, the small-sized multiple pipe joint which was difficult conventionally can be manufactured.

  In addition, each component of the joint support portion 4 is provided on the far side in the pipe inner space 5 with respect to the stopper portion 2 f of the inner pipe joint portion 2. Thereby, the polyvinyl chloride resin is injection-molded into the mold, and the deformation (sink) caused by the contraction in the vicinity of the open ends 2a and 2b generated when the double pipe joint 1 is integrally molded is produced. There is no. That is, for example, when the joint support part is close to the open end of the inner pipe joint part in the vicinity of the stopper part having a perfectly circular cross section, the shrinkage in the joint support part affects the shape in the vicinity of the stopper part, There is a possibility that the perfect circular shape is deformed. On the other hand, in the present embodiment in which the joint support portion 4 is located behind the stopper portion 2f, the contraction in the vicinity of the opening ends 2a and 2b and the stopper portion 2f is not biased, and a stable shape can be maintained. it can. As a result, the inner pipe and the inner pipe joint portion 2 can be reliably fitted without gaps at the mouth, and fluid leakage at the connection location can be prevented.

  Furthermore, the double pipe joint 1 of the first embodiment is different from the stopper part 3g of the outer pipe joint part 3 on the surface where the stopper part 2f of the inner pipe joint part 2 is different and the outer pipe joint part 3 It is designed to be located in the back of the pipe space 8. Such a configuration is easy to manufacture when the inner pipe joint portion 2 and the outer pipe joint portion 3 have the same size and the same shape as the pipe joint standardized by JIS. As a result, when designing the double pipe joint of the present embodiment, it is possible to design using CAD data corresponding to the existing pipe joint, and to reduce the design work load.

  Next, the double pipe joint 20 (corresponding to the multiple pipe joint of the present invention) of the second embodiment which is an embodiment of the present invention will be described with reference to FIGS. Here, the double pipe joint 20 of the second embodiment is an “elbow” having an L-shape like the double pipe joint 1 of the first embodiment, and the basic configuration is similar. . Therefore, in order to simplify the description, the same components are denoted by the same reference numerals, and detailed description thereof is omitted. Hereinafter, differences from the double pipe joint 1 of the first embodiment will be described with particular reference. Do.

  The double pipe joint 20 of the second embodiment includes a substantially L-shaped inner pipe joint portion 21 connected to the inner pipe of the double pipe and a substantially L-shaped outer joint connected to the outer pipe of the double pipe. The pipe joint part 3 and the joint support part 23 which supports the inner pipe joint part 21 in the state accommodated in the pipe inner space 8 of the outer pipe joint part 3 are provided. Here, the stopper part 21d of the inner pipe joint part 21 is provided on the same plane as the stopper part 3g of the outer pipe joint part 3 (see FIG. 4A). Further, as shown in FIGS. 3 (b) and 4 (a), the joint support portion 23 includes an upper support portion 9, a lower support portion 10, an outer portion support portion 11, and a disc support portion in the first embodiment. In addition to the configuration of FIG. 12, a substantially rectangular inner side support portion 24 that connects the curved outer center inner surface 3 f of the outer pipe joint portion 3 and the inner center outer surface 21 c of the inner pipe joint portion 21 is provided. Yes.

  That is, the double pipe joint 20 of the second embodiment is different from the double pipe joint 1 of the first embodiment in that the stopper part 21 d of the inner pipe joint part 21 is on the same plane as the stopper part 3 g of the outer pipe joint part 3. It is characterized by being located in. By adopting the above configuration, it is possible to facilitate the installation work at the site where the piping facility is installed. That is, when the double pipe joint 20 of the second embodiment is used, the lengths of the inner pipe and the outer pipe of the double pipe connected to the double pipe joint 20 can be made the same. Therefore, when cutting the inner tube and the outer tube of the double tube to a specified length, the cutting length is limited to one type, so that the possibility of erroneous cutting length at the site is reduced and workability is improved. be able to. In addition, the double pipe joint 20 of the second embodiment is formed such that the open ends 21 a and 21 b of the inner pipe joint portion 21 protrude from the respective open ends 3 a and 3 b of the outer pipe joint portion 3.

  In addition, the double pipe joint 20 of the second embodiment has a substantially rectangular inner support part 24. Thereby, compared with the double pipe joint 1 of 1st embodiment, the connection of the inner pipe joint part 21 and the outer pipe joint part 3 can be made more stable.

  The present invention has been described with reference to preferred embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention as described below. And design changes are possible.

  For example, in the double pipe joints 1 and 20 of the first embodiment and the second embodiment, the L-shaped “elbow” that changes the fluid conveyance direction to the orthogonal direction has been described as an example, but the present invention is not limited thereto. However, it may be a multi pipe joint having another shape.

  Specifically, although not constituting the present invention, as shown in FIGS. 5 and 6, a T-shaped inner pipe joint portion 31 connected to the inner pipe of the double pipe, and the double pipe A T-shaped outer pipe joint portion 32 connected to the outer pipe, and a joint support portion 34 that supports the inner pipe joint portion 31 in a state of being accommodated in the pipe inner space 33 of the outer pipe joint portion 32. It may constitute a letter-shaped double pipe joint 30 (cheese). Here, the double pipe joint 30 is integrally molded by injection-molding polyvinyl chloride resin into a predetermined mold, similarly to the double pipe joints 1 and 20 of the first embodiment and the second embodiment. It is a thing. Further, the open ends 31 a, 31 b, and 31 c of the inner pipe joint part 31 are located on different surfaces from the open ends 32 a, 32 b, and 32 c of the outer pipe joint part 32, and the pipe inner space 33 of the outer pipe joint part 32. It is provided in the back. And the joint support part 34 is provided in the position behind the stopper part 31d of the inner pipe joint part 31, and is located on a different surface from the stopper part 32d of the outer pipe joint part 32. Moreover, the joint support part 34 is comprised from what combined each structure of the joint support part 4 in 1st embodiment mentioned above suitably, attaches | subjects the same code | symbol and abbreviate | omits description. Thereby, it can be set as the structure which connects a double pipe and can branch the fluid which flows through an inner pipe into two directions. In particular, in the case of a complicated shape such as a T-shape, conventionally, when two types of pipe joints having different pipe diameters are combined, it is necessary to make the outer pipe joint part significantly larger than the inner pipe joint part. In contrast, the double pipe joint 30 of the present embodiment can solve the problem. As a result, a compact and lightweight T-shaped double pipe joint 30 can be easily configured. In addition, about another effect, since it is the same as the double pipe coupling 1 of 1st embodiment, description is abbreviate | omitted.

  As another example of the present invention, as shown in FIGS. 7 and 8, a T-shaped multiple including a stopper portion 41 d of the inner pipe joint portion 41 provided on the same surface as the stopper portion 32 d of the outer pipe joint portion 32 is provided. The pipe joint 40 may be configured. Here, the open ends 41a, 41b, 41c of the inner pipe joint portion 41 are formed so as to protrude from the respective open ends 32a, 32b, 32c of the outer pipe joint portion 32. Thereby, in addition to the effect of the above-mentioned double pipe joint 30, the operation | work in the installation site of piping equipment can be simplified similarly to the double pipe joint 20 of 2nd embodiment.

  Although not constituting the present invention, in the double pipe joint 1 of the first embodiment, the open ends 2a, 2b of the inner pipe joint portion 2 are different from the open ends 3a, 3b of the outer pipe joint portion 3. In the one located in the back of the pipe inner space 8 of the outer pipe joint part 3 or the double pipe joint 20 of the second embodiment, the inner pipe joint part 21 of the outer pipe joint part 3 with respect to the open ends 3a and 3b is provided. Although what protruded from the opening ends 22a and 22b was shown, it is not limited to this, For example, the opening ends 3a and 3b of the outer pipe joint part 3 and the opening end of the inner pipe joint part are on the same plane. It may be located. Even in such a configuration, if the joint support portions 4 and 23 are located at positions deeper than the stopper portions 2f and 21d of the inner pipe joint portions 2 and 21, respectively, the influence of shrinkage at the time of injection molding becomes small. Less deformation.

  In addition, in the first embodiment, the second embodiment, etc., the double pipe joints 1, 20, 30, 40 for piping the double pipe have been described as examples, but the present invention is not limited to this. A multiple pipe joint for connecting multiple pipes having two or more inner pipes arranged in parallel in the outer pipe may be used.

  Furthermore, in the first embodiment and the second embodiment, etc., the function has been described mainly to prevent leakage of the fluid flowing through the inner pipe. However, the present invention is not limited to this, and the multiple pipe joint of the present invention is not limited thereto. A pipe structure having sound insulation and heat insulation may be constructed using Further, the outer pipe joint portion may be made of a transparent plastic material or the like. As a result, the state of internal liquid leakage can be easily seen from the outside, and can be detected at an early stage, and the spread of damage can be prevented by performing a quick response such as repair.

1,20,30,40 Double pipe joint (Multiple pipe joint)
2, 21, 31, 41 Inner pipe joint part 2a, 2b, 21a, 21b, 31a, 31b, 31c, 41a, 41b, 41c Open end 2f, 21d (inner pipe joint part) Stopper part 3, 32, 42 Outside Pipe joint part 3a, 3b, 32a, 32b Open end 3g, 32d (Outer pipe joint part) Stopper part 4, 23, 34, 44 Joint support part 5 Pipe internal space 8, 33, 43 Pipe internal space 9 Upper support part (joint Support part)
10 Lower support (joint support)
11 Outer support (joint support)
12 Disc support (joint support)
24 Inside support (joint support)

Claims (2)

A multi-pipe joint for connecting a multi-pipe having one or a plurality of inner pipes and an outer pipe containing the inner pipe in the pipe,
One or a plurality of inner pipe joints each connected to the inner pipe by bonding ;
An outer pipe joint connected to the outer pipe;
A joint support part for supporting the inner pipe joint part in a state accommodated in the pipe of the outer pipe joint part,
The inner pipe joint, the outer pipe joint, and the joint support are
It is integrally molded with resin,
The stopper part of the inner pipe joint part and the stopper part of the outer pipe joint part are provided on the same plane,
The multiple pipe joint, wherein an open end of the inner pipe joint portion projects outward from an open end of the outer pipe joint portion. The multiple pipe joint is
It is formed in L shape or T shape,
The joint support is
When leveling the surface formed by the central axis of the inner pipe joint,
Between the upper outer surface of the inner pipe joint part and the upper inner surface of the outer pipe joint part,
Between the lower outer surface of the inner pipe joint part and the lower inner surface of the outer pipe joint part, and
Between the curved outer part outer surface of the L-shaped inner pipe joint part and the curved outer part inner surface of the L-shaped outer pipe joint part, or the T-shaped inner pipe joint part Of the outer portion of the T-shaped vertical line portion opposite to the open end and the inner surface of the outer portion of the T-shaped outer pipe joint portion opposite to the open end of the T-shaped vertical line portion. while,
The multi-pipe joint according to claim 1, wherein the multi-pipe joint is provided at at least three parts.

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