JP2008106862A - Pipe joint and piping structure using pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To connect even a standpipe with its self weight acted thereon, by surely keeping an expansion margin absorbing thermal expansion at the time of construction. <P>SOLUTION: In a socketlike pipe joint with a socket 2 fitted in one end, and an insertion opening 3 in the other end, and furthermore, an annular packing 4 arranged on an end of the socket 2, a spacer 5 consisting of water-soluble material constructed in a length corresponding to a non-insertion margin of the pipe is arranged inside the socket 2. This makes an end face of the pipe inserted contact with the spacer 5 when the pipe is inserted into the socket 2, therefore, the pipe is prevented from being inserted further. As the construction is completed and water flows inside the pipe, the spacer 5 consisting of the water-soluble material is dissolved, and then it flows out downstream. Therefore, since the non-insertion margin of a space corresponding to a length of the spacer 5 can be kept between the most internal portion of the socket 2 and the end face of the pipe, the expansion of the pipe can be absorbed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe joint that absorbs thermal expansion and contraction and a pipe structure using the pipe joint.

  Conventionally, pipe joints that can absorb thermal expansion and contraction have been proposed to prevent thermal expansion and contraction (thermal stress) from occurring in the pipe due to changes in the outside air temperature and the temperature of the fluid flowing inside. Has been. As such a pipe joint 100, as shown in FIGS. 9 and 10, a receiving port 101 is formed at one end portion, while an insertion port 102 is formed at the other end portion, and at the end portion of the receiving port 101, An annular packing 103 for stopping the inserted pipe P is disposed, and after the pipe P is inserted into the receiving port 101, a fixing band (not shown) is attached to the receiving port 101 to fix the pipe P. I have to. When one end of the connection target pipe P is inserted into the socket 101 of the socket-shaped pipe joint 100, it is set to the inner depth of the socket 101 in consideration of expansion and contraction due to thermal expansion. The tube P is inserted so as to secure the non-insertion allowance L1 and the end surface of the tube P is located. Thus, the extension of the pipe P is absorbed by the distance (non-insertion allowance) L1 from the end face of the pipe P to the inner back portion of the receiving port 101, while the contraction of the pipe P is the distance from the end face of the pipe P to the annular packing 103 ( (Insertion allowance) L2 is absorbed (for example, see Patent Documents 1 and 2).

In such a pipe joint 100, when inserting the pipe P to be connected into the receiving port 101, whether or not an appropriate non-insertion allowance L1 is ensured between the end surface of the pipe P inserted from the inner back of the receiving port 101. It is not possible to grasp from the outside. For this reason, an operator can ensure the space | interval equivalent to the non-insertion allowance L1 from the end surface of the pipe P to the inner back part of the receptacle 101 in the construction site, the outer peripheral surface of the one end part of the pipe P to be connected An insertion mark line having a length that secures the non-insertion allowance L1 is entered, and the pipe P is inserted into a position where the edge of the receiving port 101 and the insertion mark line written on the pipe P coincide with each other. An appropriate non-insertion allowance L1 of the tube P is secured, and then the inserted tube P is fixed by attaching a fixing band to the receiving port 101.
Japanese Utility Model Publication No. 62-24157 JP 58-54291 A

By the way, in recent years, all-electric houses have spread in apartment buildings, and CO ₂ refrigerant heat pump water heaters and latent heat recovery water heaters have spread as hot water supply systems. Since the water is discharged as expanded water, a drainage horizontal branch pipe for discharging the expanded water and drainage water is connected to the hot water storage tank. When a hot water storage tank is installed on a balcony in an apartment house, etc., a dedicated vertical pipe is installed on the balcony from the upper floor to the lower floor together with a drainage branch pipe and pipe joint, and hot water is stored in the meter box. When the tank is installed, a dedicated stand pipe is disposed in the meter box from the upper floor to the lower floor together with the drainage side branch pipe and the pipe joint.

  Here, since the temperature of the expansion water and drainage drained from the hot water storage tank may become high, the drainage horizontal branch pipe and the standing pipe through which the expansion water and drainage drain flow thermally expand. In this case, it is necessary to allow the drainage horizontal branch pipe and the vertical pipe to be allowed to extend due to thermal expansion.

  When connecting a vertical pipe from the upper floor to the lower floor, when connecting using a pipe joint, an operator enters an insertion mark on the vertical pipe, and the edge of the pipe matches the insertion mark on the pipe joint. Even if the standpipe is inserted to the position where it is placed, the standpipe may drop due to its own weight until it is fixed by the fixing band, and may enter the inner part of the receiving port too much. As described above, when the vertical pipe descends beyond the insertion mark due to its own weight, the expansion of the vertical pipe due to thermal expansion cannot be absorbed, and the pipeline system including the vertical pipe may be damaged.

  The present invention has been made in view of such problems, and even in the case of a standpipe that acts on its own weight, it is necessary to reliably secure an expansion / contraction allowance for absorbing thermal expansion / contraction during construction and connect the tube. The present invention provides a pipe joint that can be used. In addition, the present invention can reliably prevent damage to the piping system by absorbing the expansion and contraction of the vertical pipe even if the vertical pipe is thermally expanded or contracted due to a change in the outside air temperature or a temperature change of the fluid flowing inside. The present invention provides a piping structure using a pipe joint that can be used.

  The pipe joint of the present invention is a socket-like pipe joint in which a receiving port is formed at one end, an insertion port is formed at the other end, and an annular packing is disposed at the end of the receiving port. A spacer made of a water-soluble material having a length corresponding to the non-insertion allowance of the tube is provided inside, and the insertion of the tube into the receiving port is restricted by the spacer that contacts the tube.

  According to the present invention, when a tube is inserted into the receiving port, the end surface of the inserted tube abuts on the spacer, and insertion of further tubes is restricted. When construction is completed and water flows through the pipe, the spacer made of the water-soluble material dissolves and flows out. Therefore, a space (non-insertion allowance) corresponding to the spacer can be ensured between the inner back portion of the receiving port and the end surface of the pipe.

  As a result, when the pipes are connected in the longitudinal direction by socket-like pipe joints, even if thermal expansion or contraction occurs in the pipes due to changes in the outside air temperature or changes in the temperature of the fluid flowing through the inside, It is possible to reliably absorb the non-insertion allowance up to the inner back of the receiving port, and it is possible to reliably absorb the contraction of the tube by the insertion allowance from the end surface of the tube to the annular packing.

  The pipe joint according to the present invention is an elbow-shaped pipe joint having a curved tubular main pipe part having receptacles formed at both ends, and the pipe joint insertion port according to claim 1 is inserted into one end side receptacle of the main pipe part. And bonded together.

  According to the present invention, when the pipe is inserted into the receptacle of the pipe joint according to claim 1, which is bonded to the receptacle on the one end of the curved main pipe in the elbow-shaped pipe joint, the end face of the inserted pipe serves as a spacer. Abutting and further tube insertion is restricted. When construction is completed and water flows through the pipe, the spacer made of the water-soluble material dissolves and flows out. Therefore, a space corresponding to a spacer (not yet) is provided between the inner back part of the pipe joint receiving port and the end surface of the pipe bonded to the one end side receiving port of the bent tubular main pipe part in the elbow-shaped pipe joint. Insertion cost) can be secured.

  As a result, when the pipes are connected with their elbow-shaped pipe joints changed in direction, even if thermal expansion / contraction occurs in the pipes due to changes in the outside air temperature or changes in the temperature of the fluid flowing through the pipes, The pipe joint receiving port according to claim 1 can be reliably absorbed by the non-insertion allowance to the inner back part, and the pipe shrinkage can be reliably absorbed by the insertion allowance from the pipe end surface to the annular packing. Can do. In addition, an elbow-shaped pipe joint capable of absorbing thermal expansion and contraction can be easily manufactured by bonding an elbow-shaped pipe joint and a socket-shaped pipe joint capable of absorbing thermal expansion and contraction.

  The pipe joint of the present invention is an elbow-shaped pipe joint having a curved tubular main pipe portion having receptacles formed at both ends, and an annular packing disposed at the end of the one-end side receptacle of the main pipe portion. A spacer made of a water-soluble material with a length corresponding to the non-insertion allowance of the tube is arranged inside the one end side receiving port of the tube portion, and the insertion of the tube into the one end side receiving port is regulated by the spacer that contacts the tube It is characterized by doing.

  According to the present invention, when a tube is inserted into the one end side receiving port of the curved tubular main tube portion, the end surface of the inserted tube abuts against the spacer, and further tube insertion is restricted. When construction is completed and water flows through the pipe, the spacer made of the water-soluble material dissolves and flows out. Therefore, a space (non-insertion allowance) corresponding to the spacer can be ensured between the inner back portion of the one end side receiving port and the end surface of the pipe.

  As a result, when the pipes are connected with their elbow-shaped pipe joints changed in direction, even if thermal expansion / contraction occurs in the pipes due to changes in the outside air temperature or changes in the temperature of the fluid flowing through the pipes, Can be reliably absorbed by the non-insertion margin from the inner end of the one end side receiving port to the inner back portion, and the contraction of the tube can be reliably absorbed by the insertion margin from the end surface of the tube to the annular packing. In addition, the elbow-shaped pipe joint capable of absorbing thermal expansion and contraction can be manufactured in a compact size, and the installation space can be reduced.

  The pipe joint of the present invention is a T-shaped pipe joint composed of a straight tubular main pipe part having a receiving port formed at both ends and a branch pipe part branched from the main pipe part and having a receiving port formed at the end part. The insertion port of the pipe joint according to claim 1 is inserted into the one end side receiving port of the main pipe unit and bonded together.

  According to the present invention, when the pipe is inserted into the receiving port of the pipe joint according to claim 1, which is bonded to the one end side receiving port of the straight tubular main pipe part in the T-shaped pipe joint, the end surface of the inserted pipe is a spacer. And the insertion of further tubes is restricted. When construction is completed and water flows through the pipe, the spacer made of the water-soluble material dissolves and flows out. Therefore, a space (a space corresponding to a spacer) between the inner back part of the receiving port of the pipe joint and the end surface of the pipe bonded to the one end side receiving port of the straight tubular main pipe part in the T-shaped pipe joint. (Non-insertion allowance) can be secured.

  As a result, when connecting the pipes with a T-shaped pipe joint, for example, so as to merge the vertical direction and the horizontal direction, thermal expansion and contraction occurs in the pipe due to changes in the outside air temperature and temperature changes of the fluid flowing inside. Even so, the elongation of the tube can be reliably absorbed by the non-insertion margin from the end surface of the tube to the inner back of the receiving port of the pipe joint according to claim 1, and the contraction of the tube is annular from the end surface of the tube. It can be reliably absorbed by the insertion allowance up to the packing. Moreover, a T-shaped pipe joint capable of absorbing thermal expansion and contraction can be easily manufactured by bonding a T-shaped pipe joint and a socket-shaped pipe joint capable of absorbing thermal expansion and contraction.

  The pipe joint of the present invention is composed of a straight tubular main pipe portion having receiving ports formed at both ends and a branch pipe portion branched from the main pipe portion and having receiving ports formed at the end portions, and one end portion of the main pipe portion. In a pipe joint in which an annular packing is provided at the end of the side receiving port, a spacer made of a water-soluble material having a length corresponding to the non-insertion length of the tube is provided inside the one end side receiving port of the main pipe unit. Thus, the insertion of the tube into the one end side receiving port is regulated by a spacer that abuts the tube.

  According to the present invention, when a tube is inserted into the one end side receiving port of the straight tubular main tube portion, the end surface of the inserted tube abuts against the spacer, and further tube insertion is restricted. When construction is completed and water flows through the pipe, the spacer made of the water-soluble material dissolves and flows out. Therefore, a space corresponding to a spacer (non-insertion allowance) can be ensured between the inner back portion of the one end portion side receiving port and the end surface of the pipe.

  As a result, when connecting the pipes with a T-shaped pipe joint, for example, so as to merge the vertical direction and the horizontal direction, thermal expansion and contraction occurs in the pipe due to changes in the outside air temperature and temperature changes of the fluid flowing inside. Even so, the extension of the tube can be reliably absorbed by the non-insertion allowance from the end surface of the tube to the inner back of the one end side receptacle, and the shrinkage of the tube can be absorbed by the insertion allowance from the end surface of the tube to the annular packing. Can be reliably absorbed. In addition, the T-shaped pipe joint capable of absorbing thermal expansion and contraction can be manufactured in a compact size, and installation space restrictions can be reduced.

  The pipe structure using the pipe joint of the present invention is the pipe joint receiving port according to claim 1, wherein the pipe joint according to claim 4 is connected to one end side receiving port of the straight tubular main pipe part in the T-shaped pipe joint. The horizontal pipe is connected to the receiving port of the branch pipe portion in the T-shaped pipe joint, while being fixed to the floor with the pipe facing upward, and the straight pipe in the receiving port of the pipe joint and the T-shaped pipe joint according to claim 1. A stand pipe is connected to each of the other end side receiving ports of the main pipe portion.

  According to the present invention, the pipe joint according to claim 4 is connected to the one-end-side socket of the straight tubular main pipe part in the T-shaped pipe joint. The horizontal pipe is connected to the receiving port of the branch pipe portion in the T-shaped pipe joint, while the other end portion of the straight tubular main pipe portion in the T-shaped pipe joint. By connecting the vertical pipes to the side receiving ports, the fluid flowing down in the lateral direction can flow out in the vertical direction. The pipe joint receiving port according to claim 1 connected to the one end side receiving port of the straight tubular main pipe part in the T-shaped pipe joint is provided with a spacer, so that a vertical pipe is provided in the receiving port. When connecting the pipes, the vertical pipe can be reliably supported by the spacer, and the vertical pipe can be prevented from falling by its own weight until the vertical pipe is fixed. In addition, when water flows down the standpipe, the spacer dissolves and flows out, so that it corresponds to the spacer between the lower end surface of the standpipe and the inner back of the receiving port into which the lower end of the standpipe is inserted. Space (non-insertion allowance) can be secured. Therefore, even if thermal expansion / contraction occurs in the vertical pipe due to a change in the outside air temperature or a change in the temperature of the fluid flowing inside, the expansion / contraction of the vertical pipe can be absorbed to prevent the piping system from being damaged.

  In the pipe structure using the pipe joint of the present invention, the pipe joint according to claim 5 is fixed to the floor with the one end side receiving port of the straight tubular main pipe portion facing upward, and a horizontal pipe is connected to the receiving port of the branch pipe portion. On the other hand, a stand pipe is connected to each of the one end side receiving port and the other end side receiving port of the straight tubular main pipe part.

  According to the present invention, the pipe joint according to claim 5 is fixed to the floor with the one end side receiving port of the straight tubular main pipe portion facing upward, and the horizontal pipe is connected to the receiving port of the branch pipe portion, while the main pipe portion By connecting the stand pipes to the one end side receiving port and the other end side receiving port, the fluid flowing down in the lateral direction can be discharged in the vertical direction. In addition, since the spacer is arranged at the one end side receiving port of the main pipe portion, when connecting the standing tube to the receiving port, the standing tube can be surely supported by the spacer, and the standing tube is fixed. In the meantime, it is possible to prevent the standpipe from dropping due to its own weight. In addition, when water flows down the standpipe, the spacer dissolves and flows out, so that it corresponds to the spacer between the lower end surface of the standpipe and the inner back of the receiving port into which the lower end of the standpipe is inserted. Space (non-insertion allowance) can be secured. Therefore, even if thermal expansion / contraction occurs in the vertical pipe due to a change in the outside air temperature or a change in the temperature of the fluid flowing inside, the expansion / contraction of the vertical pipe can be absorbed to prevent the piping system from being damaged.

  According to the pipe joint of the present invention, it is possible to reliably secure an expansion / contraction allowance for absorbing thermal expansion / contraction during construction even if the vertical pipe is such that its own weight acts.

  Moreover, according to the piping structure using the pipe joint of the present invention, even if thermal expansion / contraction occurs in the vertical pipe due to a change in the outside air temperature or a temperature change of the fluid flowing inside, the piping system absorbs the expansion / contraction of the pipe. Can be reliably prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a first embodiment of the pipe joint of the present invention.

  As with the pipe joint 100 described above, the pipe joint 1 has a receiving port 2 formed at one end, an insertion port 3 formed at the other end, and a pipe inserted into the end of the receiving port 2. In addition to the annular packing 4 for stopping P, a ring-shaped spacer 5 having a length corresponding to the non-insertion allowance L1 is disposed inside the receiving port 2. The spacer 5 is formed of a water-soluble material, for example, a water-soluble resin such as PVA, paper, and the like, and has an outer diameter that is positioned in contact with the inner back portion of the receiving port 2 of the pipe joint 1 and a pipe P to be inserted. It has an inner diameter so as to be in contact with the end face of the tube and to have a thickness capable of supporting the tube P.

  Therefore, when connecting the pipe P using such a socket-shaped pipe joint 1, as shown in FIG. 2, the spacer 5 is inserted into the interior of the receiving port 2 of the pipe joint 1 and the inner part thereof is inserted. After the contact, the pipe P to be connected may be inserted into the receiving port 2. In this case, the end surface of the inserted tube P abuts on the end surface of the spacer 5, and insertion of the tube P beyond that is restricted. Next, if a fixing band is attached to the outer peripheral surface of the receiving port 2 of the pipe joint 1, the length of the spacer 5 between the end surface of the inserted pipe P and the inner back part of the receiving port 2 of the pipe joint 1, that is, An interval corresponding to the set non-insertion allowance L1 can be ensured, and the pipe P is fixed to the pipe joint 1 in this state. Further, the insertion port 3 of the pipe joint 1 is inserted into another pipe P.

  When the construction is completed and water flows into the pipe P, the spacer 5 is dissolved by the flowing water and flows out together with the water, so that the end face of the inserted pipe P and the inner back part of the receiving port 2 of the pipe joint 1 A space having a length corresponding to the set non-insertion allowance L1 is ensured between.

  As a result, when thermal expansion or contraction occurs in the pipe P due to a change in the outside air temperature or a change in the temperature of the fluid flowing inside, the extension of the pipe P is not inserted from the end surface of the pipe P to the inner back of the receiving port L1. Further, the contraction of the tube P can be absorbed by the insertion allowance L2 from the end surface of the tube P to the annular packing 4.

  In the above-described embodiment, the spacer 5 formed in a ring shape is exemplified. However, the spacer 5 is not limited to the ring shape as long as it has a strength capable of supporting the inserted tube P. For example, as shown in FIG. 3 (a), a plurality of holes 5a having an arbitrary shape penetrating from the outer peripheral surface to the inner peripheral surface can be formed in the circumferential direction, or as shown in FIGS. 3 (b) and 3 (c). The notch 5b having an arbitrary shape is alternately formed at one end portion and the other end portion at intervals in the circumferential direction, or the notch 5c having an arbitrary shape is formed to face each other so as to be symmetrical. It doesn't matter. Thus, when the hole 5a and the notches 5b and 5c are formed in the spacer 5, the contact area with water increases, so that the spacer 5 can be dissolved in a short time or can be divided into a plurality of parts and discharged. It becomes possible, and the expansion / contraction allowance can be secured immediately.

  The spacer 5 may be integrally formed when the receiving port 2 and the insertion port 3 of the pipe joint 1 are formed. The spacer 5 is formed separately from the forming of the pipe joint 1 and inserted into the receiving port 2 of the pipe joint 1. It may be arranged.

  By the way, in embodiment mentioned above, while the socket 2 was formed in the other end part while the receptacle 2 was formed in the one end part, the T-shaped pipe joint and the elbow-shaped were illustrated. It may be a pipe joint, and these embodiments will be described below.

  FIG. 4 shows a second embodiment of the pipe joint of the present invention.

  The pipe joint 6 is configured by connecting the socket-like pipe joint 1 described above to a T-shaped pipe joint 10 including a straight tubular main pipe section 11 and a branch pipe section 12 branched from the main pipe section 11. Has been. That is, the pipe joint 6 includes a main pipe portion in the T-shaped pipe joint 10 in which the receiving ports 13 are formed at both ends of the straight tubular main pipe portion 11 and the receiving ports 14 are formed at the end portions of the branch pipe portion 12. 11, the insertion port 3 of the pipe joint 1 described above is inserted into one end side receiving port 13 and connected through an adhesive.

  In addition, about the socket-shaped pipe joint 1, since it demonstrated previously, the same code | symbol is attached | subjected to the same member and description is abbreviate | omitted.

  Even when the pipe P is connected using such a pipe joint 6, the pipe P to be connected may be inserted into the receiving port 2 of the pipe joint 1 constituting the pipe joint 6. In this case, the end surface of the inserted tube P abuts on the end surface of the spacer 5, and insertion of the tube P beyond that is restricted. Next, if a fixing band is attached to the outer peripheral surface of the receiving port 2 of the pipe joint 1 constituting the pipe joint 6, the length of the spacer 5 between the end surface of the inserted pipe P and the inner back part of the receiving port 2 of the pipe joint 1. That is, an interval corresponding to the set non-insertion allowance L1 can be secured, and the tube P can be fixed in this state. Further, the pipe P is connected to the other end side receiving port 13 of the straight tubular main pipe part 11 and the receiving port 14 of the branch pipe part 12 in the pipe joint 10 constituting the pipe joint 6, and the construction is finished.

  As a specific example, when a hot water storage tank is installed on a balcony, a piping structure using a pipe joint 6 for guiding expansion water, drainage water, and the like will be described.

  As shown in FIG. 5, a through hole Fa penetrating from the upper floor to the lower floor is formed in the floor F of the balcony B of each floor, and the pipe joint 6 is fixed to each floor F facing the through hole Fa. In this case, the pipe joint 6 is fixed so that the receiving port 2 of the pipe joint 1 faces upward. Next, one end of a drain pipe (horizontal pipe) P1 that guides expansion water, drainage drainage and the like from the hot water tank H is connected to the drain trap of the hot water tank H, and the other end is in the pipe joint 10 constituting the pipe joint 6. It connects to the receptacle 14 of the branch pipe part 12. Furthermore, after inserting the upper end part of the standing pipe P2 into the other end side receiving port 13 of the straight tubular main pipe part 11 in the pipe joint 10 constituting the pipe joint 6 fixed on the floor F of the upper floor through the through hole Fa. Then, the lower end portion of the vertical pipe P2 is inserted into the receiving port 2 of the pipe joint 1 constituting the pipe joint 6. Here, the standpipe P2 inserted into the receiving port 2 of the pipe joint 1 constituting the pipe joint 6 is supported by the spacer 5 disposed in the receiving port 2, and is further restricted from descending. A distance corresponding to the length of the spacer 5, that is, the non-insertion allowance L <b> 1 is secured between the end surface of the vertical pipe P <b> 2 and the inner back portion of the receiving port 2 of the pipe joint 1 constituting the pipe joint 6. Yes. Thereafter, a standing band P2 may be fixed by attaching a fixing band to the receiving port 2 of the pipe joint 1 constituting the pipe joint 6.

  In addition, when the through-hole Fa formed in the floor F of the balcony B becomes a partition penetration part, when connecting the standpipe P2, it is necessary to perform a partition penetration treatment to the fire prevention partition penetration part. As a treatment method of such a partition penetration part, the thermal expansion refractory material which concerns on manufacture and sale of Sekisui Chemical Co., Ltd., a product name: Fiblock (trademark) can be mentioned, for example.

  When the construction is completed and the drainage flows into the vertical pipe P2, the spacer 5 is dissolved by the flowing down drainage and flows out together with the drainage. Therefore, the pipe joint 1 that constitutes the pipe joint 6 with the end face of the inserted vertical pipe P2 A space having a length corresponding to the set non-insertion allowance L1 is ensured between the inner back portion of the receiving port 2 and the inner receiving portion 2. In this state, when expansion water, drainage drainage, or the like flows out from the hot water tank H, the vertical pipe P2 flows down through the drainage pipe P1 and the pipe joint 6. And when expansion | extension generate | occur | produces in the vertical pipe P2 by the expansion water which flows down the vertical pipe P2, drain drainage, etc., the expansion of the vertical pipe P2 is not inserted from the end surface of the vertical pipe P2 to the inner back part of the receptacle 2 It can be absorbed by the charge L1. Further, when the vertical pipe P2 is contracted due to a decrease in the outside air temperature, the vertical pipe P2 can be absorbed by the insertion margin L2 from the end surface of the vertical pipe P2 to the annular packing 4.

  By the way, in embodiment of the pipe joint 6 mentioned above, since the pipe joint 1 was adhere | attached and formed, the existing socket-shaped pipe joint 1 and the T-shaped pipe joint 10 are utilized easily. However, it is unavoidable to be relatively large, and there is a risk that the installation location may be restricted. Therefore, it is preferable to design the T-shaped pipe joint that can absorb thermal expansion and contraction in a compact size. As such a compact pipe joint 7, as shown in FIG. 6, a straight tubular main pipe portion 11 having receiving ports 13 formed at both ends, and a receiving port 14 branched from the main pipe portion 11 and formed at the end portions. The annular packing 4 is disposed at the end of the one end side receiving port 13 of the main pipe portion 11, and the spacer 5 is disposed inside the one end side receiving port 13. Has been.

  At this time, the spacer 5 may be integrally formed when the main pipe portion 11 and the branch pipe portion 12 of the pipe joint 7 are formed, and is formed separately from the main pipe portion 11 and the branch pipe portion 12. The pipe joint 7 may be disposed by being inserted into the one end side receiving port 13 of the main pipe part 11.

  Further, FIG. 7 shows a third embodiment of the pipe joint of the present invention.

  The pipe joint 8 is configured by connecting the socket-shaped pipe joint 1 described above to an elbow-shaped pipe joint 20 formed of a curved tubular main pipe portion 21. That is, the pipe joint 8 is inserted into the one end side receiving port 22 of the main pipe part 21 in the elbow-shaped pipe joint 20 formed of the curved tubular main pipe part 21 having the receiving ports 22 formed at both ends. 3 is inserted and connected via an adhesive.

  Even when the pipe P is connected using such a pipe joint 8, the pipe P to be connected may be inserted into the receiving port 2 of the pipe joint 1 constituting the pipe joint 8. In this case, the end surface of the inserted tube P abuts on the end surface of the spacer 5, and insertion of the tube P beyond that is restricted. Next, if a fixing band is attached to the outer peripheral surface of the receptacle 2 of the pipe joint 1 constituting the pipe joint 8, the length of the spacer 5 between the end surface of the inserted pipe P and the inner back portion of the receptacle 2 of the pipe joint 1. That is, an interval corresponding to the set non-insertion allowance L1 can be secured, and the tube P can be fixed in this state. Further, the pipe P is connected to the other end side receiving port 22 of the curved tubular main pipe part 21 in the pipe joint 20 constituting the pipe joint 8.

  When the construction is completed and water flows into the pipe P, the spacer 5 is dissolved by the flowing water and flows out together with the water, so that the end face of the inserted pipe P and the inner back part of the receiving port 2 of the pipe joint 1 A space having a length corresponding to the set non-insertion allowance L1 is ensured between.

  As a result, when thermal expansion or contraction occurs in the pipe P due to a change in the outside air temperature or a change in the temperature of the fluid flowing inside, the extension of the pipe P is not inserted from the end surface of the pipe P to the inner back of the receiving port L1. Further, the contraction of the tube P can be absorbed by the insertion allowance L2 from the end surface of the tube P to the annular packing 4.

  In the above-described embodiment of the pipe joint 8, the case where the socket-like pipe joint 1 is bonded to the existing elbow-shaped pipe joint 20 has been described, but as an elbow-shaped pipe joint capable of absorbing thermal expansion and contraction. It can also be designed in a compact size. As shown in FIG. 8, such a compact pipe joint 9 includes a curved main pipe portion 21 in which receiving ports 22 are formed at both ends, and at one end side receiving port 22 of the main pipe portion 21. An annular packing 4 is disposed, and a spacer 5 is disposed inside the one end side receiving port 22.

  At this time, the spacer 5 may be integrally formed when the main pipe portion 21 of the pipe joint 9 is formed, or is formed separately from the main pipe portion 21 and the main pipe portion 21 of the pipe joint 9 is formed. You may arrange | position by inserting in the one end part side receptacle 22.

  In addition, the construction point of the pipe P with respect to this pipe joint 9 is fundamentally the same as the construction point with respect to the pipe joint 8 demonstrated previously, and description is abbreviate | omitted.

  In the above-described embodiment, the material of the pipe and the pipe joint is desirably a synthetic resin having a heat resistance of 90 ° C. or higher, and particularly, one made of a chlorinated vinyl chloride resin is more economically preferable.

It is a half sectional view showing one embodiment of the pipe joint of the present invention. FIG. 2 is a half sectional view of the pipe joint, spacer, and pipe of FIG. 1. It is a perspective view explaining the modification of a spacer. It is sectional drawing which shows other embodiment of the pipe joint of this invention. It is explanatory drawing which shows the piping structure of a hot water tank as an example of the piping structure using the pipe joint of FIG. It is sectional drawing which shows the modification of the pipe joint of FIG. It is sectional drawing which shows another embodiment of the pipe joint of this invention. It is sectional drawing which shows the modification of the pipe joint of FIG. It is a half sectional view showing a conventional pipe joint. It is a half sectional view explaining the expansion-contraction state of the pipe inserted by ensuring the non-insertion allowance in the conventional pipe joint.

Explanation of symbols

1, 6, 7, 8, 9, 10, 20 Pipe joint 2, 13, 14, 22 Receiving port 3 Insertion port 4 Annular packing 5 Spacer 11 Straight tubular main pipe part 12 Branch pipe part 21 Curved tubular main pipe part

Claims (7)

  In a socket-like pipe joint in which a receiving port is formed at one end and an insertion port is formed at the other end, and an annular packing is provided at the end of the receiving port, the insertion amount of the pipe is not inserted into the receiving port. A pipe joint characterized in that a spacer made of a water-soluble material having a length corresponding to is disposed, and the insertion of the pipe into the receiving port is restricted by the spacer abutting on the pipe.   In an elbow-shaped pipe joint composed of a curved tubular main pipe part having receptacles formed at both ends, the pipe joint insertion port according to claim 1 is inserted into one end side receptacle of the main pipe part and bonded together. A pipe joint characterized by that.   In an elbow-shaped pipe joint comprising a bent tubular main pipe part with receiving holes formed at both ends and having an annular packing disposed at the end part of the one end side of the main pipe part, the one end side receiving hole of the main pipe part A pipe made of a water-soluble material having a length corresponding to the non-insertion allowance of the pipe is disposed inside the pipe, and the insertion of the pipe into the one end side receiving port is regulated by the spacer abutting on the pipe. Fittings.   One end side of the main pipe part in a T-shaped pipe joint comprising a straight tubular main pipe part having a receiving port formed at both ends and a branch pipe part branched from the main pipe part and having a receiving port formed at the end part The pipe joint according to claim 1, wherein the pipe joint is inserted into the receptacle and bonded together.   A straight tubular main pipe portion having receptacles formed at both ends and a branch pipe portion branched from the main pipe portion and having receptacles formed at the ends, and an annular packing at the end of one end side receptacle of the main pipe portion In the T-shaped pipe joint, a spacer made of a water-soluble material having a length corresponding to the non-insertion allowance of the pipe is arranged inside the one end side receiving port of the main pipe portion. A pipe joint characterized in that insertion of a pipe into a side receiving port is restricted by a spacer that abuts the pipe.   The pipe joint according to claim 4 is fixed to the floor with the receiving port of the pipe joint according to claim 1 connected upward to the one end side receiving port of the straight tubular main pipe part in the T-shaped pipe joint. A horizontal pipe is connected to the receiving port of the branch pipe part in the pipe-shaped pipe joint, while the horizontal pipe is connected to the receiving port of the pipe joint according to claim 1 and the other end side receiving port of the straight tubular main pipe part in the T-shaped pipe joint. A pipe structure using a pipe joint, characterized in that pipes are connected.   The pipe joint according to claim 5 is fixed to the floor with one end side receiving port of the straight tubular main pipe portion facing upward, and a horizontal pipe is connected to the receiving port of the branch pipe portion, while one end of the straight tubular main pipe portion A pipe structure using a pipe joint, wherein a vertical pipe is connected to each of the part side receiving port and the other end side receiving port.

Images